Contents

2

1 Preface

5

2 Research Digest

7

3 Message from Foreign Participants

23

4 Members

27

5 Research Life33

6 Prizes and Awards

39

7 List of Collaborative Research

43

8 Research Funds

47

9 List of Patents

53

10 Committees of academic societies and conferences

54

11 List of Presentations

55

12 List of Publications

75

13 Copies of Selected Papers

85

14 TV, Journals and Newspaper Items

145

15 List of Events

151

16 Events and Memorieas

153

3Preface
The report in your hands is intended to give a general impression about research activityof the Yoshikawa Laboratory in the Institute for Materials Research (IMR), Tohoku
University. This is the first report of my laboratory as an official Research Division in IMR(originally established in April, 2007 as Yoshikawa Group at IMRAM). It contains asummary of our various activities and copies of our selected publications in FY2012.
We hope that you will find it interesting and informative.
Current issue covers our activities within academic year from April 2012 to March 2013.
Within this period we put our efforts to develop our key technologies and understand thescience behind them. Highlights of this year are three following items. The first one is thefurther progress in studies of GAGG for gamma-ray scintillator. Food survey monitoring
system and gamma camera for environment survey are under development. The second
one is the improvement of 6LiCAF growth yield. LiCAF is being investigated for neutron
detection as an alternative to 3He. The third one is the establishment of crystal growthtechnology of halide materials. Eu:SrI2 was grown by the micro-pulling down method.
One inch bulk Eu:SrI2 was also successfully grown. The fourth one is related to starting
the development of shaped crystal growth of langasite type CNGG-Al and CTGS-Al for
combustion pressure sensor.
When we try to develop novel scintillator crystals, there are plenty of topics, which wehave to study, such as design of host lattice from both solid state chemistry point of view
and physical point of view. In the multicomponent garnet study, we found that the relative
position between band gap and position of dopant level are the key issues. Moreover, thesingle crystal growth technology, optical characterization, understanding of luminescenceprocesses, searching for the suitable photodetector, reflector, light guide and so on are also
very important.
This year, we attempted to apply this concept to other topics such as piezoelectricmaterials and got positive results.
These activities are always supported by our colleagues from all over the world throughthe fruitful collaboration.
The details of these studies can be found in the photos and papers published within theabove period and included in this report.
All the laboratory members took part in preparation of this report. I appreciate theirefforts very much. I wish also to thank to all of our colleagues from Japan and overseasthat had participated in our research and significantly contributed to the progress of our
projects.
Akira YOSHIKAWA

Professor,
Institute for Materials Research (IMR),
New Industry Creation Hatchery Center (NICHe),
Tohoku University
March, 2013
4

5

Research Digest

67Research Activities in 2012
Development of
Scintillator, Laser, Piezoelectric crystals
Crystal growth technology and device application

Infrafed photon emitting scintillator
Nd-doped Ca3(Nb,Ga)5O12
X-ray
Near Infra readInt’l collaboration

Inst. Phys. (Czech), Milan-Bicocca Univ. (Italy), Tennessee Univ.（USA）
Univ. Lyon1 (France), General Physics Inst. (Russia), IMS（Russia）
Soltan Institute for Nuclear Studies (Poland), Delft Univ. (The Netherlands)

Fluoride
Scintillators

Oxide
Scintillator

Neutron imager,
VUV
scintillators

photon detector

Novel radiation in-situ real-time monitor for radiation therapy
and diagnostics
Tissue Optical window

Tissue Optical
window

Nd3+ infrared emission– matches tissue transparency window

Tissue Optical window

good transmittance

PEM
PET/MRI
Dosimeter
Food inspection

Multidisciplinary Research
Halidefor
Scintillators“Characterization”
Survey meter
and“Device application”

Scintillator~3 mm φ20 mm

A. Yoshikawa et al., IEEE/NSS (2012)

Support Industry by “The Cabinet Office”

Transparent
Ceramics
Scintillators

Combustion sensor,
SAW filter, …

Compton camera,
APD, MPPC,MSGC, …

Piezoelectric
Crystals

Development of
new photodetectors

Materials for gamma-ray detection
Multicomponent Ce-doped garnet scintillators - GAGG

Application:

High light yield
42000 photons/MeVFound for
Gd3Ga3Al2O12:Ce!!
90ns decay time

Balanced composition band gap engineering andenergy-level positioning

After composition screening
by Micro-pulling down

Further studies of high-quality crystals
with optimized composition grown by
Czochralski method:

GammaSpotter detector
by Furukawa Co.

Growth of GAGG by floating-zone method(inverted composition Gd3Al3Ga2O12:Ce)
Oxygen2 vol%

20 vol% 40 vol% 100 vol%Univ., National Inst.
Univ. of Tokyo (Kamiokande, Takahashi Lab.), Kyoto Univ.(Tanimori Lab),
Osaka Univ.(Sarukura Lab), Nagoya Univ. (Iijima Lab, Uritani Lab, Iguchi Lab),
Hiroshima Univ.(Fukazawa Lab), Kyushu Univ.(Ishibashi Lab), Waseda Univ. (Kataoka Lab)

Company
Tokuyama, Furukawa, TDK, Koike, Murata Manufacturing, Canon,
Chiyoda Technol, Nihon Kessho Kogaku, Hitachi-Aloka Medical , Oxide, Tanaka Kikinzoku Kogyo,
Furuya, Star seiki, TEP, Toei Scientific Industrial, Aoyama Seiko, Akira Seiko

Gd3Al2Ga3O12 undoped

Gd3Al2Ga3O12:Ce 2%

Ar 100%O2 100%
M. Seki et al., IEEE/NSS (2012)

Support Industry by “Japan Science ant Tecnology Agncy (JST)”with Furukawa Co.Ltd.

Neutron scintillators alternatives to 3He
Luminescence mechanism of neutron scintillator.
【Luminescence center】
Electronic orbit transition
luminescence of RE ions

Reaction
6Li ＋n → 3H ＋α-ray

Safety inspection

Excitation

Neutron6Li
6Li

α-ray RE
6Li 6
Li

NeutronGamma-ray Survey meter

X-ray

Scintillation

This page presents halide materials for radiation detectors and their optical properties.
In the last year, single crystals of Eu:SrI2, LaBr3, RbPb2Cl5, Nd:RbPb2Cl5 andYb:RbPb2Cl5 were prepared by the micro-pulling-down (m-PD) method and by thevertical Bridgman method. In this year, we especially focused on the characteristics ofthe single crystals of Eu doped SrI2. They are displayed below.

Usual Scintillators
Tl:NaI, Ce:LaBr3, Bi4Ge3O12

Scintillator crystal

Eu:SrI2 Scintillator
High performance of the survey meter is expected when using Eu:SrI2.

Eutectic composite scintillators
Crystal growth

As grown LiF/LiLuF4 eutectic crystal.

a) Image of SEM and (b) mapping image of Lu by
EDX for the LiF/LiLuF4 eutectic crystal.

Grown Eu : SrI2 crystals

Y. Yokota, et al., Presentation at 4th international conference on Directionally Solidified Eutectic Ceramics (2012).

Light yeild and energy resolution

VUV fluoride crystals
200
BaLuF undoped
BaLuF:Nd1%
BaLuF:Tm1%
BaLuF :Tm1%Nd1%

Grown crystal of
BaLu2F8:Nd1%

Possibility of energy transfer
improvement in Nd-doped scintillator
by Tm3+ codopingOverlap of the Tm3+ 5d-4f emision
with Nd3+ 4f-5d absorption –condition for efficient energy transfer

Intensity (arb. units)

150

100

50

0
100

150

200
250
Wavelength(nm)

300

350

Radioluminescence in the VUV/UV
regionNo 5d-4f luminescence features of
Nd3+ or Tm3+ observed (poortransmittance in VUV region is not thecause)
Tm3+ 4f-4f peaks observed in the Tmdoped samples

J. Pejchal, et al., Presentation at 第23回 光物性研究会 (2012).
Eu2K0.5 LiSAF
Eu2K1 LiSAF(u-PD)
Eu2K3 LiSAF
Eu2 LiSAF
Li-glass

2

Counts / Channel

10

西本ら、第73回応用物理学会学術講演会

Challenge to increase the crystal size up to 1 inch×1 inch

1

10

0

10

As grown (left) and polished (right) Eu2%-K1% co-doped crystals.

SrI2 crystals were studied by X-ray diffraction (XRD) that confirmed presence of pure SrI2 crystal phase,radioluminescence measurements showed Eu2+ emission peak around 430 nm, under 137Cs γ-ray irradiation
light yields were determined to be 60,000 ~ 78,000 ph/MeV, energy resolution was between 3.7~ 5.0%.

Eu2K1LiSAF(u-PD)
Eu2LiSAF

0

200

400
600
Channel

800

1000

-10

-5

0

5
10
Time / sec-6

15 20x10

Pulse height spectra and decay time of our grown
crystals compared with Li-glass.

S. Wakahara, et al., Presentation at EEE 2012 Nuclear Science Symposium (2012).

Support Industry by “Japan Science an d Technology Agency (JST)”with Tokuyama Co.

Large size crystal
successfully
prepared
Support Industry by “Kanto Bureau of Economy, Trade and Industry”
with Chiyoda technol, Oxide, Hitachi Aloka MedicalTransparent ceramic scintillators

Photodetectors

Introduction

We investigate radiation response of our scintillators using photomultiplier tubes andsemi-conductor detectors, also under different temperature conditions.

Spark plasma sintering(SPS)

Favorable properties of ceramics
Better chemical uniformity with respect to single crystals.

Advantages of SPS

A rapid sintering rate suitable for densification of variety ofPossibility of reaching high dopant concentration.

1, New Pulse-height Measurement Systemceramics.

Strongly reductive conditions due to carbon die and punch.

Possibility of sintering materials with high-melting point.

Easy high-density solidification.

We use several photodetectors
for pulse height measurement.

Ceramics are cluster single crystals
TEM and SEM image of transparent ceramicTransparent ceramics byKonoshima chemical Co., Ltd.

Carbon sheet

sample PMT (Photo multiplier tubes)Ultra Bialkali (UBA) R7600U

die
Single crystalline particles with micro particles

 APD (avalanche photodiode)

Experimental methodology of SPS

RE:SrHfO3 (RE=Ce)
Hf : High Z, but high melting point.
→ Using SPS method.

Ce:SrHfO3

Al,Ce:SrHfO3 exhibited high transparency!

New setup(5.5 MeV
alpha rays
241Am source)

Transmittance and photoluminescenceof Ce:SrHfO3

Transmittance(Al,Ce:SrHfO3)

0

Pulse height(Al,Ce:SrHfO3)
511 keV

Ce:SrHfO3

60Co

Ce:GSO (137Cs)
12,000 ph/MeV

662 keV

Ce/Al:SrHfO3

Photoluminescence(Al,Ce:SrHfO3)



Scintillation decay curve(Al,Ce:SrHfO3)
excitation source: 137Cs
Fitting:0.129 exp(-t/21.6[ns]) + 0.00101(Xe-lamp)

S. Kurosawa et al., LUMDETR 2012

Lu3Al5O12 (LuAG)

Suitable for photon counting

Possibility of temperature control,
Estimation of the temperaturedependence of the scintillation properties

New APD measurement
system

22Na
137Cs

λex =
330 nmHigh quantum efficiency (up to ~80%)
Wide sensitivity range(ex: 320 -1000 nm for S8664 HPK) MPPC (Multi-Pixel Photon Counter)

1.3 MeV

Pure-SrHfO3

λem =395 nmAPD

5 cm

Ta,Ce:SrHfO3 Al,Ce:SrHfO3

Si,Ce:SrHfO3

annealingRadioluminescence(Al,Ce:SrHfO3)

Annealing and co-dopant

Ultra and super –bialkali(UBA and SBA)

2, New SpectrometerIn the “Next Program”, we investigate the
Near Infra-red (NIR) scintillators using
new luminescence apparatus
We apply NIR scintillator
to dosimeter in radiation
therapy

3, Halide Scintillator
Measurement
Pulse height spectra or scintillation decay
curves under gamma ray excitation can bemeasured even for Eu:SrI2 and otherhygroscopic halides!

Optimization of sintering temperature

1500℃

1600℃

1700℃
1700℃ is the best sintering temperature!

New spectrometer for NIR

NIR crystals

New setup

80,000photons/MeV !

Development of Piezoelectric single crystals
Piezoelectric crystals

Development of dosimeterusing shape-controlled scintillation crystal

SNGS

Langasite-type crystal
・The Curie point above 1,000 degrees.
・The piezoelectric constant is 2 times higher than of the quartz.
⇒ Suitable for materials for “The combustion pressure sensor”

Fuel supply
Catalyst

Engineelement for dosimeter

as-grown crystal

Fuel

Incoming air

Development of shape control growth

Ce:YAGSTGS

Exhaustcutting

Combustion pressure sensor

No polishing
Ca3Nb(Ga1-xAlx)3Si2O14

中空素子

x=0.0

x=0.2

x=0.8

x=1.0

Support Industry by “The Smoll and Medium Enterprise Agency”
with TDK, Furuya Metal, Akita Seiko, Aoyama Seiko

137Cs▪ Fast response▪ Geiger mode APD

Investigation of the crystals properties
Measurement of the piezoelectric modules

Pulse-height spectrum of
as-grown crystal
Pocket dosimeter

Rotated Piezoelectricmodules of CTGS

▪ Temperature compensation circuit
Collaborated with TDK

Calculation of rotated piezoelectric modules
d'12=-d11cos2(θ)+d14sin(θ)cos(θ)
d'14=d11sin(2 θ)+d14cos(2 θ)Development of functional metallic productsby shape-controlled growth techniques
Developmentof ceramics
crucible

Characterization of rotated cuts
Resistance measurements
up to 1000 °C
Resistivity of CTGS & CNAGSExtensional mode (XYt)-35°- cut

Piezo modulus d'12 - 9.03 pC/N
Coupling Factor - 24.9%
Q-factor - 13 000

Face Shear mode (XYt)-15°- cut

Piezo modulus d'14 - 13.9 pC/N
Coupling Factor - 21.3%
Q-factor - 10 000

Growth of Ir alloy fiber crystal could be achieved.
Support Industry by “Ministry of Economy, Trade and Industry”
with Tanka Kikinzoku Kogyo, Star Seiki ,TEP, Toei kagaku sangyo

＜ Garnet type ＞＜ Garnet type ＞＜ Ilmenite type ＞＜ Perovskite type ＞＜ Sesquioxide type ＞

＜ Apatite type ＞＜ Spinel type ＞＜ ZnO type＞＜ Vanadate type＞＜ Silicate type＞＜ Borate type＞＜ Aluminate type＞＜ Langasite type＞＜ Corundum type＞

Message from Foreign Participants

22

23

I	
   have	
   been	
   invited	
   by	
   Prof.	
   A.Yoshikawa	
   to	
   visit	
   his	   lab	
   and	   to	
   attend	
   the	   conference	  Summit	   of	
   Material	
   that	
   occurred	
   between	
   November	
   25th	   and	   December	
   2nd	   at	
   the	  Institute	
  of	
  Materials	
  research	
  at	
  the	
  Tohoku	
  University	
   in	
  Sendai.	
  I	
  knew,	  of	
  course	
  Prof	  A.Yoshikawa	
  and	
  his	
  team	  since	  a	  long	  time	  in	
  the	
  field	
  of	
  scintillating	
  materials,	
  through	  the	
   conferences	
   and	   publications,	
   but	   it	
   was	   my	
   first	
   time	
   in	
   the	   Institute	
   and	   even	
   in	  Japan.	
  	
  I	
   have	
   been	
   really	
   impressed	
   by	
   the	   high	
   level	
   of	
   research	
   in	
   the	   field	
   of	
   material	
  preparation	  and	
  related	
  characterizations.	
  I	
  also	  have	  been	
  extremely	
  impressed	
  by	
  the	
  speed	  of	
  activity	
  recovery,	
  at	
  the	
  scale	  of	
  the	
  whole	  University,	
  after	  the	  2011	
  dramatic	  events	  in	
  Japan.	
  	
  
	
  
I	
   found	
   here	   a	
   very	
   good,	
   pleasant	   and	   efficient	
   atmosphere	
   for	   working.	
   I	
   really	
  appreciated	
   the	   conference	   Summit	
   of	
   Materials	
   which	
   allowed	
   me	
   to	
   get	
   a	
   good	
  overview	
   of	
   the	   activities	
   in	
   material	
   sciences.	
   The	   parallel	
   workshop	
   about	
   electron	
  microscopy	
   and	   related	
   techniques	
   of	
   single	
   ions	
   characterizations	
   was	   also	
   of	
   high	
  interest.	
  
	
  
As	
   the	   Luminescence	
   group	
   leader	
   of	
   the	   new	
   Institute	
   Light	
   and	   Matter	
   (ILM)	
   at	
   the	  University	
   Lyon	
   1	
   and	   at	
   the	   CNRS,	
   but	   also	
   as	
   the	   Chairman	
   of	
   the	   International	
  Conference	
   Series	
   SCINT	
   on	
   the	   inorganic	
   scintillating	
   materials,	
   I	
   really	
   consider	
   the	  Prof.	   A.Yoshikawa’s	
   group	
   as	   a	
   key	   research	
   lab	
   in	
   the	   international	
   community	
   of	  materials	
  for	
  Optical	
  purposes	
  in	
  general	
  and	
  for	
  scintillation	
  in	
  particular.	
  
	
  
I	
   frankly	
  hope	   that	
  we’ll	
   develop	
   in	
   the	   near	
   future	
   cooperation	
   in	
   scintillating	
   materials	
  fields,	   may	   be	
   in	
   the	   frame	
   of	
   the	   joined	
   Eu-­‐Japan	
   project	   which	
   has	   been	
   recently	
  submitted.	
  
	
  
I	
   would	
   like	
   to	
   thank	
   all	   the	   actors	
   which	
   contributed	
   to	
   my	
   invitation	
   and	   Prof.	
  A.Yoshikawa	
  in	
  particular	
  for	
  this	  pleasant	  and	
  fruitful	
  first	
  time	  in	
  Japan.	
  	  Prof.	
  Christophe	
  Dujardin	
  Institute	
  Light	
  and	  Matter	  University	
  Lyon	
  1	
  and	
  CNRS	
  
	
  
	
  
	
  

	
  

ОАО «FOMOS-MATERIALS»

16, Buzheninova st.,Russia, Moscow, 107023
Тel: +7(495)-963-0013
Fax:+7(495)-964-2266
E-mail: mail@newpiezo.com____________________________________________________________
Message for 2012 annual report from Andrey Medvedev
Dr. Kochurikhin introduced Prof. Yoshikawa and me in Moscow in the spring2012. Prof. Yoshikawa told about their research plans a study of piezoelectric propertiesof the single crystals for high-temperature applications in the sensors of physicalquantities. Since I have some experience in research, development, and devices
manufacture on different piezoelectric materials Prof. Yoshikawa invited me to work in
IMR for a few months.
In June 2012, I visited Prof. Yoshikawa laboratory for the first time. This was
my first visit to Japan after the great earthquake and the second visit to the Tohoku
University. During my stay I was familiarized with the equipment and measuring
devices available in the lab. We drew a purchase plan of new equipments and fixtures
for investigation piezoelectric and electrophysical properties of the different kindpiezoelectric materials. Also I made a small report, which has told about the company"Fomos-Materials" and its products as well as about the properties of langasite family
single crystals.
In mid-September 2012, I came to Tohoku University again and began to workin the laboratory of Prof. Yoshikawa. One of the directions of our research was a studyof the possibility using micro crystals grown by the Micro-Pulling-Down technique formeasuring piezoelectric constants of the different materials. It was shown that with theright choice of the plate orientation the measurements results at small and large samples
are practically the same. We have also developed and produced original fixture for thehigh-temperature measurements of the different properties of the piezoelectric materials.
Also I would like to share my impressions about educational activities in Prof.
Yoshikawa lab. All students have the opportunity to work on the growth and researchequipment, to participate in international conferences. Especially, I think it is very
useful to hold weekly seminars where all team members report about their research
results.
Finally, I would like to thank Professor Yoshikawa for the invitation to work in
his laboratory, Mr. Uemura for their help in solving many of the problems encounteredduring my stay in Japan, and to wish all members of Prof. Yoshikawa team great
success in the crystals growth and investigation of their properties.
Sincerely Yours,

Andrey Medvedev
24

25

Members

26

27

Members of Yoshikawa Lab

First grade
Doctoral course student
A. Yamaji

Professor
A. Yoshikawa

Associate Professor(2012.9月まで)
T. Yanagida

Research AssistantProfessor
Y. Yokota

Research AssistantProfessor(2012.6月から)
S. Kurosawa

TechnicalCounsellor
H. Uemura

Post Doctoral Fellow
Y. Fujimoto

Post Doctoral Fellow
Y. Futami

Post Doctoral Fellow
J. Peichal

Researcher
Y. Shoji

Secretary(2012.9月まで)
A. Imai

Secretary
K. Toguchi

Secretary(2012.7月から)
M. Sasaki

Secretary(2013.1月から)
Y. Saijo

28

First grade
Master course student
S. Suzuki

First grade
Master course student
K. Nishimoto

First grade
Master course student
M. SekiResearcher
K. Kamada

Second grade
Master course student
S. Wakahara

Researcher
M.SatoFirst grade
Master course student
M. KitaharaFirst grade
Master course student
A. Suzuki

Researcher
D. Totsuka

Researcher
A. Medvedev
29

Secretaries

2012 年度 吉川研究室
Members (2012 academic year)

4. 1. 2012
Professor
Dr.

教授
Akira Yoshikawa

Associate Professor
Dr.

Takayuki Yanagida

Research Assistant Professor

吉川 彰

2012.7 月から

Yumiko Saijo

西條 由美子2013.1 月から

大学院生

M2

助教

Masanori Kitahara

北原 正典

M1

Kei Nishimoto

西本 けい

M1

Mafuyu Seki

関 真冬

M1

Akira Suzuki

鈴木 彬

M1

Shotaro Suzuki

鈴木 祥太朗M1

2012.9.30 月まで

2012.6 月から

顧問
Prof

Masae Kikuchi

菊地 昌枝

Prof

Touetsu Shishido

宍戸 統悦

Researchers

民間等共同研究員
Ko Onodera

小野寺 晃

TDK 株式会社／
TDK Co., Ltd.

Masato Sato佐藤 真人

TDK 株式会社／
TDK Co., Ltd.

Ryota Ohashi

大橋 良太

キャノン株式会社／
Canon Inc., Ltd.

Kentaro Fukuda

福田 健太郎株式会社トクヤマ／Tokuyama Co., Ltd.

Noriaki Kawaguchi

河口 範明

株式会社トクヤマ／Tokuyama Co., Ltd.

Kei Kamada

鎌田 圭

古河機械金属株式会社／
Furukawa Co., Ltd.

Daisuke Totsuka

戸塚 大輔

日本結晶光学株式会社／
Nihon kesshokougaku Co., Ltd.

上村 博

Visiting Professors/Researchers

客員教授

研究員

Prof. Georges Boulon

ジョージ ブーロン

FranceProf. Martin Nikl

マーチン ニクル

Czech Republic

ヴラディミール カチューリッヒン

Russia

博士研究員

Dr.

Jan Pejchal

ヤン ペジャール

Dr

Yutaka Fujimoto

藤本 裕

Dr.

Yoshisuke Futami

二見 能資

Dr

Andrey Medvedev

アンドレイ メドベーゼフ

Czech

Dr.

Russia2012.9 月から

Dr.

技術参事

庄子 育宏

2012.10 月から

Dr.
30

佐々木 愛美

若原 慎吾

黒澤 俊介

Yasuhiro Shoji

Megumi Sasaki

Shingo Wakahara

柳田 健之

Shunsuke Kurosawa

Researcher

戸口 景子

D1

Dr.

Hiroshi Uemura

Keiko Toguchi

2012.9.30 まで

山路 晃広

横田 有為

Technical Counsellor

今井 亜希子Akihiro Yamaj

Yuui Yokota

Post Doctoral Fellow

Akiko Imai

Graduate Students

准教授

Dr.

Adviser

NICHe 兼任

秘書

VladimirV.Kochurikhin

31

Research Life

32

33

My first challenging year has passed. I enjoyedlaboratory life and tried to focus on my two topics
which were halide material for the gamma ray
detectors and the eutectic materials for the neutron
scintillators.
Laboratory life was very exciting due to variety of
research activities from scintillation study andcrystal growth to evaluation using a lot of
sophisticated experimental equipment. I tried tomake single crystals of rare-earth doped SrI2 by
Micro-Pulling-Down Method and evaluate its
scintillation properties. In the beginning, I had
repeated some failures in my experimental work.
Recently, however, I have made progress and I am
able to make good crystals. Now when I think about
it, the failures made me strong enough to solve
complicated problems. My most impressive memoryis the international conference at Washington.D.C.
There, I had oral presentation for the first time and I
felt great accomplishment. I also enjoyed someevents such as cherry-blossom, beer party in IMR,
summer trip for Miyagi Zao and so on.
All laboratory members are very kind with a senseof humor. I really appreciate their assistance and mydelightful days.
I’ll do my best in studies and work for thislaboratory until my graduation.

Akira Suzuki(M1)
Hello! I am Akira Suzuki, a graduate student in the
Yoshikawa laboratory. I joined this laboratory lastyear, and I was very impressed by its research
activities. I always enjoyed my laboratory life withmany research activities such as experiments,
conference attendances and paper publications.
My major is material engineering with crystal
growth dynamics. Now I have been studying a novel
scintillator material, especially an oxide scintillator
crystal. In Yoshikawa laboratory, we can do all theexperiments from synthesis of new materials toevaluation of their properties, and I have developed
various types of new oxide scintillators using our
micro-pulling down method.
In this academic year, I attended many domestic
and international conferences. I learned latest
achievements of science and engineering andcommunicated with other researchers in thesemeetings. In additions, I also published many peerreviewed scientific papers and obtained some patents.
The experience to write and publish a paper is one of
the most exciting events in my student life.
I thank all the colleagues for their kindness, and I
have decided to do my best on my research and enjoy
this life in my next year.

Kei Nishimoto
(M1)
34

35

In Yoshikawa laboratory many single crystals arebeing designed, grown by micro-pulling-down method
and their scintillation properties such as a light yield,
decay time, energy resolution, and so on are studied.
My research theme is the improvement of scintillation
properties, especially of the Ce doped GAGG crystal. I
measured a lot of data, wrote some papers and grew
several Ce:GAGG crystals with a lot of help of mygentlemen colleagues. I could attend five meetings
included two international conferences in this year as.
And then, we went Mt. Zao in this summer to hold ameeting and I remember the astonishing beautiful
mountain view.

Mafuyu Seki
(M1)
Masanori Kitahara(M1)This year I researched piezoelectric materials. There
were few people dealing with this topic so there weremany things to do in the lab from the beginning. Sometime it was hard to try and struggle with somemeasurements. But it was a good opportunity to find out
something myself. I want to harness this experience also
the next year. I want to thanks to all the members inYoshikawa lab for the advice in research, office work,and many other things we talked and did.
36

Shotaro Suzuki(M1)

One year has passed since I joined
Yoshikawa laboratory. I am researching
thermal neutron scintillation materials.
When I joined laboratory the first day, I
did not know many things about the
research. All of the members in thislaboratory are very kind and guide me
in a responsible way. Now, I gained a
bit of knowledge for research. I am
enjoying my research life with laughand studying. There were a lot of events.
For example, cherry blossom viewing
party, beer and imoni party, futsal andbasketball cup in IMR, etc. In this year,
we are the champions at the basketball
cup in IMR by grace of me (and somestudent and post-doctoral)!! Next year, I
will pass over the last research life at
full power!!

37

Prizes and Awards

38

39

受賞等
Prizes and Awards
1. 黒澤 俊介
『新化学技術研究奨励賞』 (2012 年 5 月 25 日)
公益社団法人新化学技術推進協会
2. BOMS（吉川研究室）『優勝』 (2012 年 11 月 13 日)
平成２４年度 金属材料研究所共融会 バスケットボウル大会

40

41

List of Collaborative Research

42

43

Visits by International Collaborator 2012
Affiliation
General Physics InstituteResearcher

Research Theme

Dr. V. Kochurikhin

diameter control of Czochralski growth

Fomos Materials

Langasite-type piezoelectric single crystals and

Dr. A. Medvedev

General Physics Institutetheir piezoelectric properties

Dr. M. Borik

Growth of bulk single crystals(Russia)
LPCML, CB Lyon1 Univ.

Pr. G. Boulon

TEM Analysis of Rare Earth Dopant(France)Pr. G. Boulon(France)
LPCML, CB Lyon1 Univ.

Pr. C.Dujardina nonpress vacuum sintering method(Korea)Dr. M. Nikl

Characterization of various scintillator(Czech Republic)

Dr. P. Prusa

materials

Scintillation Materials RC
University of Tennessee、

Pr. Yoshikawa

Pr. Yoshikawa,

Period of stayApril 22 - 24

June 4 - 5

Pr. C. Melcher

Institute for Scintillation
Materials (Ukraine)

LSO scintillator(Czech Republic)
LPCML, CB Lyon1 Univ.

(France)

Pr. Yoshikawa
Assist. Pr. Yokota
Assist. Pr. Kurosawa

October 5-6

Pr. Yoshikawa
Assist. Pr. Yokota
Assist. Pr. Kurosawa

October 6

The University of Adelaide(Australia)

Pr. Yoshikawa

November 13-14

Institute of Physics ASCR
(Czech Republic)

Dr. Pejchal

March 1-19

General Physics Institute(Russia)(Russia)industrial applications

Seminar at Yoshikawa Laboratory 2012

Institute of Physics ASCR

September 25 - 26

Large size bulk halide crystals growth and

Pr. O.Gektin

Affiliation

Pr. Yoshikawa

Fomos Materials

(USA)

44

The National Institute of Solar
Energy(France)
TPS corporation

Institute of Physics ASCR

Nov. 27

Technical Univ. (Russia)

Ceramic laser materials with

Luminescence in various scintillator(France)Nov. 27

North –Caucasus State

Researcher

Distribution in YAG Optical Ceramics

LPCML, CB Lyon1 Univ.

Date

Affiliation

Growth of bulk single crystals and automatic(Russia)(Russia)

Visits to International Collaborator 2012

SpeakerDr. M. Nikl
Pr. C.Dujardin

Title of speech
Inorganic scintillation
nanopowders and nanocomposites
Spacial distribution of
luminescence in various systems

45

Research Funds

46

47

平成 24 年度 研究資金
Research funds (2012 fiscal year)【内閣府 （研究管理機関：日本学術振興会）】
The Cabinet Office (In charge: Japan Society for the Promotion of Science)
1. 最先端・次世代研究開発支援プログラム
Funding Program for Next Generation World-Leading Researchers (NEXT Program)「次世代癌治療用近赤外線発光シンチレータの系統的研究開発」"Systematic study of infrared photon emitting scintillators for cancer therapy”
研究代表者：吉川 彰
Research Leader: A. Yoshikawa
メンバー：黒澤 俊介、Jan Pejchal、山路 晃広、若原 慎吾、鈴木 彬、北原 正典、
関 真冬
Member: S. Kurosawa, J. Pejchal, A. Yamaji, S. Wakahara, A. Suzuki, M. Kitahara,
M. SekiTotal: 150,080,000 yen/3years, 2011.2 - 2013.3 ( 26,950,000 yen in 2012FY)【経済産業省－東北経済産業局】
Tohoku Bureau of Economy, Trade and Industry‐The Ministry of Economy, Trade and Industry
1. 戦略的基盤技術高度化支援事業(サポイン)
Funding Program for Strategic Support Industry「難加工性機能性合金の形状制御結晶育成技術の開発」“Developments of ｆ unctional metallic products by shape-controlled growthtechniques”
プロジェクト副代表者：吉川 彰
Project Sub Leader: A. Yoshikawa (NICHe)
メンバー：横田 有為、二見 能資、上村 博
Member: Y. Yokota, Y. Futami, H. Uemura
Total: 34,880,000 yen, 2012.4 - 2013.3 ( 10,650,000 yen for our team)48【経済産業省－関東経済産業局】
Kanto Bureau of Economy, Trade and Industry‐The Ministry of Economy, Trade and Industry
1. 平成２３年度地域イノベーション協創プログラム補助金（震災復興技術イノベーション創出実証検出事業）
Funding Program for Innovative technology in reconstruction after disaster株式会社千代田テクノル、株式会社オキサイド、日立アロカメディカル株式会社からの再委託研究Truster: Chiyoda Technol Corporation, Oxide Corporation, Hitachi Aloka Medical, Ltd「新規シンチレータを用いた高感度シンチレーション検出器の開発」“Development of high sensitive dosimeter with new scintillator”
研究代表者：湯蓋 邦夫
Research Leader: K. Yubuta
メンバー：吉川 彰、横田 有為、黒澤 俊介
Member: A. Yoshikawa, Y. Yokota, S. Kurosawa
Total: 12,920,000 yen for our team, 2012.4 -2013.3【経済産業省－中小企業庁】
The Small and Medium Enterprise Agency‐The Ministry of Economy, Trade and Industry
1．平成２３年度グローバル技術連携・創業支援補助金一般枠
Funding Program for the small and medium enterprise in developing global operation
株式会社フルヤ金属、秋田精工株式会社、株式会社青山精工からの再委託研究
Truster: Furuya Metal Co.Ltd, Akita Seiko Co.Ltd, Aoyama Seiko Co.Ltd「燃焼圧センサー用形状制御圧電結晶作製を可能にする特殊合金坩堝の鋳造技
術と連続原料供給システムの開発」“Developments of alloy crucibles and growth furnace system on shape-controlled
piezoelectric crystals”
研究代表者：横田 有為
Research Leader: Y. Yokota
メンバー：吉川 彰、Andrey Medvedev, Valery Tchani
Member: A. Yoshikawa, A. Medvedev, V. Tchani
Total: 25,000,000 yen for our team, 2012.5 - 2012.1249

【JSTプロジェクト】
Japan Science and Technology Agency【復興庁】
Reconstruction Agency

1. JST研究成果展開事業 【先端計測分析技術・機器開発】
Development of Systems and Technology for Advanced Measurement and Analysis
Technology

1. 平成２４年度地域イノベーション戦略支援プログラム
Funding Program for “Invest Japan” promotion for reconstruction
宮城県インテリジェントコスモス研究機構からの再委託プログラム
Truster: Intelligent Cosmos Research Institute, Miyagi pref.
「次世代自動車のための人材育成プログラム」“Manpower training program for innovation in automotive industry”
メンバー：横田 有為、吉川 彰、上村 博、二見 能資、Member: Y. Yokota, A. Yoshikawa, H. Uemura, Y. Futami
Total: 3,500,000 yen, 2012.10 - 2013.3「無人ヘリ搭載用散乱エネルギー認識型高位置分解能ガンマカメラの実用化開発」“Research and development of scattered energy recognition type and high positional
resolution gamma camera for unmanned helicopter survey”
古河機械金属株式会社からの再委託研究
Truster: Furukawa Co. Ltd.
研究代表者：黒澤 俊介
Research Leader: S. Kurosawa
メンバー：藤本 裕、鈴木 彬、鈴木 祥太朗、北原 正典、関 真冬
Member: Y. Fujimoto, A. Suzuki, S. Suzuki, M. Kitahara, M. Seki
Total: 23,750,000 yen for our team, 2012.4 - 2013.3
2. JST研究成果最適展開支援プログラム （A-STEP）シーズ育成タイプ
Adaptable and seamless technology transfer program through targetdrive R&D「核物質セキュリティ用3He 代替中性子計測装置の開発」“Development of neutron scanning apparatus for homeland security using scintillator
instead of 3He gas detector.”
研究代表者：横田 有為
Research Leader: Y. Yokota
Total: 7,250,000 yen for our team, 2012.10 - 2013.3
3. JST研究成果最適展開支援プログラム （A-STEP）【FS】探索タイプ
Adaptable and seamless technology transfer program through targetdrive R&D「非破壊検査や核セキュリティー等への応用を目指した中性子イメージング用数十
マイクロメートル高分解能シンチレータカメラの開発」“Development of high resolution neutron scintillation camera for homeland security
and nondestructive testing”
研究代表者：二見 能資 Research Leader: Y. Futami
1,300,000 yen, 2012.10 -2012.3

50【文部科学省科学研究費補助金】
Ministry of Education, Culture, Sports, Science and Technology
日本学術振興会Japan Society for the Promotion of Science
科学研究費助成
Grants-in-Aid for Scientific Research1.

若手研究（B）
Grants-in-Aid for young scientists (B)研究代表者: 横田 有為
Research Leader: Y. Yokota
1,300,000 yen, 2012.4-2013.3

2.

特別研究員奨励費
Postdoctoral Fellowship
研究代表者: 藤本 裕
Research Leader: Y. Fujimoto
700,000 yen, 2012.4-2013.3
研究代表者: 黒澤 俊介
Research Leader: S. Kurosawa
800,000 yen, 2012.4-2013.3

51

【企業・財団・個人からの受託・共同研究，寄付金および小型プロジェクト】
Funds from industry, Foundations, personal donation and small project

平成 24 年度申請特許

List of patents
1.

株式会社トクヤマTokuyama Corporation
1. フッ化物単結晶、発光素子及びシンチレーター

2.

3.

4.

古河機械金属株式会社
Furukawa Co. Ltd.
TDK 株式会社
TDK Corporation
日本結晶光学株式会社
Nihon Kessho Kogaku Co.Ltd

吉川

彰、柳田

河口

範明

キヤノン株式会社
Canon Inc.

有為、藤本

裕、石津

澄人、福田

健太郎、

(Akira Yoshikawa, Takayuki Yanagida, Yuui Yokota, Yutaka Fujimoto, Sumito Ishizu,
Kentaro Fukuda, Noriaki Kawaguchi)
2. シンチレーター用材料、シンチレーター及び放射線検出器
吉川

5.

健之、横田

彰、黒澤

俊介、横田

有為、鈴木

彬、古川

保典

(Akira Yoshikawa, Shunsuke Kurosawa, Yuui Yokota, Akira Suzuki, Yasunori Furukawa)
3. 結晶材料

6.

株式会社ジー・イー・エス
GES Co. Ltd.

吉川

彰、横田

有為、黒澤

俊介

(Akira Yoshikawa, Yuui Yokota, Shunsuke Kurosawa)
7.

8.

七十七銀行
The 77 Bank
大阪大学レーザーエネルギー学研究センター 共同研究
Collaboration program with Institute of Laser Engineering, Osaka Univ.
「真空紫外域に発光する新規発光結晶の開発」

4. 結晶材料及び放射線検出器
吉川

俊介、横田

有為、庄子

育宏、鈴木

彬、宍戸

統悦

(Akira Yoshikawa, Shunsuke Kurosawa, Yuui Yokota, Yasuhiro Shoji, Akira Suzuki,
Toetsu Shishido)

他

52

彰、黒澤

外国出願

２

件

53

学会、学内における役員・委員等

Committees of academic societies and conferences
吉川 彰
Dr. Akira YOSHIKAWA, Professor
日本結晶成長学会
Japanese Association for Crystal Growth Cooperation

理事（新技術・新材料分科会担当）
Trustee (responsible for
new technology and newmaterials branch)
編集委員
Member of the editorial
staff

日本学術振興会第 161 委員会
No. 161 committee, Japan Society for the Promotion of
Science

運営委員
Manager

日本学術振興会第 186 委員会
No. 186 committee, Japan Society for the Promotion of
Science

代表幹事
Chief secretary

List of Presentations

第 7 回発光・受光及び放射線変換素子に関する国際学会 科学諮問委員
The 7th International Conference on Luminescent Detectors Scientific Advisory
and Transformers of Ionizing Radiation (LUMDETR 2009)
Committee

54

Europhysical Conference of Defects in Insulating Materials(EURODIM 2010)

国際諮問委員International Advisory
Committee

International Conference on Defects in Insulating Materials(ICDIM 2012)

国際諮問委員International Advisory
Committee

55

A. International conference and symposia

7.

S. Kurosawa, H. Kubo, S. Kabuki, K. Ueno, S. Iwaki, M. Takahashi, K. Taniue, N. Higashi, K.
Miuchi, D.G. Kim, M.J. Kim, T. Tanimori, J.W. Kim

国際学会“2D Dose-Verification in Proton Therapy Using an Electron-Tracking Compton Camera”
1.

Y. Yokota, Y. Futami, M. Sato, K. Tota, T. Yanagida, K. Onodera and A. Yoshikawa

Particle Therapy Co-Operative Group (PTCOG51) 2012/5/14-19 Seoul, Korea (2012)“Growth of columnar and plate-shaped langasite-type piezoelectric single crystals and theirpiezoelectric properties”

8.

M. Nikl, K. Kamada, A. Yoshikawa, P. Bohacek

The International Workshop on Piezoelectric Materials and Applications (IWPMA)“New Material Concepts in Complex Oxide Phosphors and Scintillators”

2012/4/22-25 Hirosaki, Japan (2012)

5th International Conference on Optical and Optoelectronic Properties of Materials andApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

2.

A. Yoshikawa, Y. Yokota, S. Kurosawa, Y. Fujimoto, M. Nikl, V. V.Kochurikhin“Development of Novel Scintillator Crystals and their applications”

9.

A. Yoshikawa, S. Kurosawa, A. Yamaji, S. Wakahara, Y. Fujimoto, K. Watanabe, A. Yamazaki,

International conference on Solid State Chemistry

A. Uritani, T. Iguchi, T. Yanagida, M. Nikl

2012/4/22-27 Stavropol, Russia (2012)“Crystal Growth and Scintillation Properties of Colquiriite (6LiCaAlF6, 6LiSrAlF6) Single
Crystal, as a Candidate for Neutron Scintillator Alternatives to 3He”

3.

A.Yamaji, Y. Fujimoto, T. Yanagida, N. Kawaguchi, Y. Yokota, A. Yoshikawa

5th International Conference on Optical and Optoelectronic Properties of Materials and“Crystal Growth and Scintillation Properties of Ce-Doped K2NaLuF6”

Applications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

IEEE 2012 Symposium on Radiation Measurements and Applications (SORMA west 2012)2012/5/14-17 Oakland, CA, US (2012)

10. S. Wakahara, T. Yanagida, Y. Yokota, A. Yamaji, J. Pejchal, Y. Fujimoto, M. Sugiyama“Crystal Growth and Evaluation of Scintillation Properties of Eu-M (M=Na, K, Rb and Cs)

4.

S. Kurosawa, V. V. Kochurikhin, M. A.?Borik, Y. Yokota, T. Yanagida, A. Yoshikawa

Co-doped LiSrAlF6 Complex Fluoride Single Crystals for Thermal Neutron Detector”“Scintillation Properties of High-Melting Temperature Single Crystals Using Skull Melting

5th International Conference on Optical and Optoelectronic Properties of Materials andMethodApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)”

SORMA west 2012/5/14-17 Oakland, CA, US (2012)
11. J. Pejchal, M. Nikl, T. Yanagida, Y.Yokota, A.Yoshikawa
5.

6.

56

J. Iwanowska, L. Swiderski, T. Szczesniak, P. Sibczynski, M. Moszynski, K. Kamada, K.

“Luminescence and Scintillation Properties of Rare-earth-doped BaLu2F8 Single Crystals

Tsutsumi, Y. Usuki, T. Yanagida, A. Yoshikawa

Grown by Micropulling-down Method”“Performance of Ce:Gd3Ga3Al2O12 (GGG) Scintillator in Gamma-Ray Spectrometry”

5th International Conference on Optical and Optoelectronic Properties of Materials and

SORMA west 2012/5/14-17 Oakland, CA, US (2012)

Applications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

K. Watanabe, T. Kodo, A. Yamazaki, A. Uritani, T. Iguchi, N. Kawaguchi, T. Yanagida, Y.

12. A. Suzuki, S. Kurosawa, J. Pejchal, V. Babin, A. Yamaji, M. Seki, Y. Futami, Y. Yokota,

Fujimoto, K. Fukuda, T. Suyama, A. Yoshikawa

K.Yubuta, T. “Shishido, M. Kikuchi, M. Nikl, A. Yoshikawa”“Temperature Dependence of Neutron-Gamma Discrimination Based on Pulse Shape

Scintillation Properties of Ce-doped Gd3Al2Ga3O12 Crystal Grown by Floating Zone Method

Discrimination Technique in a Ce:LiCaAlF6 Scintillator”

5th International Conference on Optical and Optoelectronic Properties of Materials and

SORMA west 2012/5/14-17 Oakland, CA, US (2012)

Applications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)57

13. M. Seki, V. V. Kochurikhin, S. Kurosawa, A. Suzuki, A. Yamaji, Y. Fujimoto, S. Wakahara, Y.

19. T. Yanagida, Y. Fujimoto, K. Yamanoi, M. Kano, A. Wakamiya, S. Kurosawa, Y. Yokota, A.

Yokota, A. Yoshikawa

Yoshikawa, N. Sarukura“Optical and Scintillation Properties of Y3Al5O12 Crystals Doped with Rare Earth”“Optical and Scintillation Properties of Bulk ZnO Crystal”

5th International Conference on Optical and Optoelectronic Properties of Materials and5th International Conference on Optical and Optoelectronic Properties of Materials andApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

Applications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

14. Y. Fujimoto, T. Yanagida, S. Kurosawa, A. Yoshikawa

20. A.Yamaji, Y. Yokota, Y. Fujimot, S. Kurosawa, A. Yoshikawa“Growth and Scintillation Properties of Ce3+-doped (Yx-1Gdx)AlO3 Crystals”“Crystal Growth and Scintillation Properties of Ce : Li(Ca,Sr)AlF6”

5th International Conference on Optical and Optoelectronic Properties of Materials and5th International Conference on Optical and Optoelectronic Properties of Materials andApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

Applications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

15. K. Kamada, T. Yanagida, T. Yanagida, T. Endo, K. Tsutumi, Y. Usuki, A. Yoshikawa

21. K. Kamada, T. Yanagida, T. Endo, K. Tsutumi, A. Yoshikawa“Crystal Growth and Scintillation Properties of Ce doped (Gd,Y)3Al5O12 Single Crystal”“Crystal Growth and Scintillation Properties of Ce, Pr and Eu doped La2:75Lu2:25Ga3O12

5th International Conference on Optical and Optoelectronic Properties of Materials andSingle Crystal”

Applications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

5th International Conference on Optical and Optoelectronic Properties of Materials andApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

16. A.Yamaji, V. V Kochurikhin, Y. Fujimoto, T. Yanagida, S. Kurosawa, Y. Yokota, A. Yoshikawa“Optical Properties and Radiation Response of Ce3+-doped GdScO3 Crystals”

22. Y. Yokota, Y. Futami, M. Sato, K. Tota, Y. Fujimoto, S. Kurosawa, K. Onodera and A.

5th International Conference on Optical and Optoelectronic Properties of Materials andYoshikawaApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)“Crystal growth of plate- and tube-shaped langasite-type piezoelectric single crystals and their
physical properties”

17. S. Kurosawa, Y. Yokota, T. Yanagida, A. Yoshikawa“Eu-Concentration Dependence of Optical and Scintillation Properties for Eu-doped SrF2

International Symposium on Integrated Functionalities (ISIF2012) 2012/6/18-21 Hong Kong,
China (2012)

Single Crystals”
5th International Conference on Optical and Optoelectronic Properties of Materials andApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

23. S. Kurosawa, T. Yanagida, Y. Yokota, A. Yoshikawa“Scintillation Property of Nddoped BaY2F8”
The 10th International Conference on Excitonic Processes in Condensed Matter,

18. Y.Yokota, A. Yamaji, S. Kurosawa, A. Yoshikawa“Growth of Ce Doped LiYF4 Bulk Crystal with High Ce Concentration by Cz Method and the

Nanostructured and Molecular Materials (EXCON2012) 2012/7/2-6 Groningen, The
Netherlands (2012)

Scintillation Properties”
5th International Conference on Optical and Optoelectronic Properties of Materials andApplications (ICOOPMA12) 2012/6/3-7 Nara,Japan (2012)

24. Y. Yokota, Y. Fujimoto, S. Kurosawa, N. Kawaguchi, K. Fukuda, and A. Yoshikawa“Optical and Scintillation properties of Lu co-doped Ce:LiYF4 single crystals”
The 10th International Conference on Excitonic Processes in Condensed Matter,
Nanostructured and Molecular Materials (EXCON2012) 2012/7/2-6 Groningen, The
Netherlands (2012)58

59

25. Y. Yokota, M. Sato, Y. Futami, K. Tota, Y. Fujimoto, S. Kurosawa, K. Onodera and A.

30. Y. Fujimoto, K. Kamada, T. Yanagida, S. Kurosawa,A. Yoshikawa
La2O3-Al2O3

Based

Yoshikawa“Photo- and Radio- Excited Luminescence Properties of“Crystal growth and piezoelectric properties of Ca3NdGa3Si2O14 single crystals grown

Eutectics”

under various atmosphere”

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation

International Symposium on Applications of Ferroelectrics (ISAF) 2012/7/9-13 Aveiro,- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

Portugal (2012)
31. J. Pejchal, V. Babin, M. Nikl, A. Yoshikawa, A. Beitlerova
26. M. Nikl, J. Pejchal, K. Kamada, A. Yoshikawa(Lu,Y,Gd)3(Ga,Al)5O12 single crystal“Luminescence processes in Ti-doped LiAlO2 single crystals for neutron scintillators”

scintillators

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation“Luminescence and scintillation mechanism in Cerium doped (Lu,Y,Gd)3(Ga,Al)5O12 single- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

crystal scintillators”
8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

32. A.Yamaji, H. Ogino, Y. Fujimoto, T. Yanagida, Y. Yokota, S. Kurosawa, A. Yoshikawa“Scintillation Properties of Er-doped Y3Al5O12 single crystals”
8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation

27. P. Prusa, K. Kamada, J. A. Mares, A. Yoshikawa, M. Nikl

- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)“Light yield of (Lu, Y, Gd)3Al2Ga3O12:Ce garnets”
8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

33. A.Yoshikawa, K. Kamada, Y. Fujimoto, S. Kurosawa, Y. Yokota, J. Pejchal, Y. Futami, M. Nikl
“Crystal chemistry of Cerium doped multicomponent {Gd,RE}3[Ga,Al,M’]2 (Ga,Al,M”)3O12
single crystalline scintillators and their performance”

28. W. Drozdowski, K. Brylew, M. E. Witkowski, A. J. Wojtowicz, K. Kamada, T. Yanagida, A.
Yoshikawa8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)“Effect of Thermal Annealing on Light Yield, Time Profiles, and Low Temperature
Thermoluminescence of LuAG:Pr Scintillator Crystals”

34. Y. Ohashi, N. Yasui, T. Den, Y. Yokota, T. Yanagida, A. Yoshikawa

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation“Phase-Separated Ce3+:GdAlO3-Al2O3 Scintillator with Light-Guiding Property”- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

29. S. Wakahara, T. Yanagida, Y. Fujimoto, Y. Yokota, A.Yamaji, J. Pejchal, S. Kurosawa, N.
Kawaguchi, K. Fukuda and A.Yoshikawa

35. S. Kurosawa, M. Sugiyama, Y. Yokota, S. Wakahara, T. Yanagida, A. Yoshikawa“Evaluation of Ce3+ and Alkali Metal Ions Co-doped LiSrAlF6 Crystalline Scintillators”“Optical Property and Radiation Reaction of RE:SrHfO3 (RE=Ce, Pr) prepared by the Spark

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation

Plasma Sintering Method”- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)60

61

36. E. Mihokova, K. Vavr?u, K. Kamada, V. Jary, A. Yoshikawa, M. Nikl

42. N. Kawaguchi, T. Yanagida, K. Fukuda, S. Kajimoto, H. Fukumura, Y. Fujimoto, S. Kurosawa,“Deep trapping states in Cerium doped (Lu,Y,Gd)3(Ga,Al)5O12 single crystal scintillators”

Yuui Yokota, A. Yoshikawa

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation“Microstructural studies and neutron responses of LiF/CaF2:Eu eutectic crystals”- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

4th internatinla Directionally Solidified Eutectic Ceramics (DSEC4) 2012/10/14-17 Washington,
D.C. Area, USA (2012)

37. K. Brylew, W. Drozdowski, M. E. Witkowski, A. J. Wojtowicz, K. Kamada, T. Yanagida,
A. Yoshikawa

43. S. Kurosawa, Y. Yokota, A. Yamaji, N. Kawaguchi, K. Fukuda“VUV, UV & VIS Spectroscopy of LuAG and LuAG:Pr Scintillator Crystals”“Luminescent properties of LiF/PrF3 eutectic crystals”

8th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation

4th internatinla Directionally Solidified Eutectic Ceramics (DSEC4) 2012/10/14-17 Washington,- LUMDETR 2012 2012/9/10-14 Halle (Saale), Germany (2012)

D.C. Area, USA (2012)

38. A.Yoshikawa, A. Yamaji, K. Nishimoto, Y. Fujimoto, S. Kurosawa, Y. Yokota

44. K. Watanabe, Y. Kondo, Y. Takahashi, A. Yamazaki, A. Uritani, T. Iguchi, N. Kawaguchi, T.

“Growth of LiF/CeF3 eutectic crystals by the micro-pulling-down method and their scintillation

Yanagida, Y. Fujimoto, K. Fukuda, S. Ishidu, A. Yoshikawa

properties“Evaluation of Neutron/Gamma-Ray Sensitivity Ratio for LiCaAlF6 Scintillators””

4th internatinla Directionally Solidified Eutectic Ceramics (DSEC4) 2012/10/14-17 Washington,

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

D.C. Area, USA (2012)

Anaheim, CA, USA (2012)

39. S. Kurosawa, Y. Yokota, A. Yamaji, Y. Futami, N. Kawaguchi, K. Fukuda

45. Y. Kawabata, K. Watanabe, S. Maruyama, A. Yamazaki, T. Iguchi, A. Uritani, A. Yoshikawa, T.

“Growth and optical properties of LiF/LaF3 eutectic crystals”

Yanagida, Y. Fujimoto

4th internatinla Directionally Solidified Eutectic Ceramics (DSEC4) 2012/10/14-17 Washington,“Development of an Optical Fiber Detector for Neutron Monitoring in Boron Neutron Caputure

D.C. Area, USA (2012)

Therapy”
IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

40. K. Nishimoto, Y. Yokota, S. Kurosawa, Y. Fujimoto, N. Kawaguchi, K. Fukuda, A. Yoshikawa

Anaheim, CA, USA (2012)“Crystal growth of LiF/ LiYF4 eutectic crystals and the luminescent properties”
4th internatinla Directionally Solidified Eutectic Ceramics (DSEC4) 2012/10/14-17 Washington,
D.C. Area, USA (2012)

46. M. Seki, S. Kurosawa, A. Suzuki, A. Yamaji, Y. Fujimoto, S. Wakahara, Y. Futami, Y. Yokota, K.
Yubuta, T. Shishido, M. Kikuchi, A. Yoshikawa“Temperature Dependence of Ce-Doped Gd3(Al,Ga)5O12 Scintillators on the Light Output”

41. Y. Yokota, S. Kurosawa, N. Kawaguchi, K. Fukuda“Growthandluminescent

properties

of

LiF/LiLuF4IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,
eutectic

crystals

grown

by

Anaheim, CA, USA (2012)

micro-pulling-down method”
4th internatinla Directionally Solidified Eutectic Ceramics (DSEC4) 2012/10/14-17 Washington,
D.C. Area, USA (2012)

47. Y. Fujimoto, T. Yanagida, N. Kawaguchi, K. Fukuda, D. Totsuka, K. Watanabe, A. Yamazaki, S.
Kurosawa, A. Yoshikawa“Scintillation Properties of Undoped and Ce3+-Doped Strontium Metaborate Crystals”
IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,
Anaheim, CA, USA (2012)

62

63

48. S. Wakahara, T. Yanagida, A. Yamaji, Y. Yokota, Y. Fujimoto, M. Sugiyama, N. Kawaguchi, S.

54. K. Kamada, P. Prusa, M. Nikl, T. Yanagida, T. Endo, K. Tsutsumi, A. Yoshikawa

Kurosawa, K. Fukuda, A. Yoshikawa“Czhocralski Growth and Gamma-Ray Response of Ce:(Gd,Lu,Y)3(Al,Ga)5O12 Single“Evaluation of Optical and Scintillation Properties of K Co-Doped Eu:LiSrAlF6 Complex

Crystals”

Fluoride Single Crystals for Thermal Neutron Detector”

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

Anaheim, CA, USA (2012)

Anaheim, CA, USA (2012)
55. K. Kamada1, K. Tsutsumi, T. Endo, M. Nikl, T. Yanagida, A. Yoshikawa
49. K. Nishimoto, Y. Yokota, S. Kurosawa, Y. Fujimoto, T. Kojima, F. Nitanda, Y. Furukawa, A.

“Czhocralski Growth of Pr:( Lu,Y)3(Al,Ga)5O12 Single Crystals and Their Scintillation

Yoshikawa

Properties”“Eu Concentration Dependence on Scintillation Properties of Eu Doped SrI2 Single Crystals

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

Grown”

Anaheim, CA, USA (2012)

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,
Anaheim, CA, USA (2012)

56. K. Kamada, M. Nikl, T. Yanagida, A. Yoshikawa“Growth of Sc Doped RE3Al5O12 (RE=Y, Gd, Lu) Single Crystal by Micro-Pulling-down

50. S. Suzuki, A. Yamaji, Y. Fujimoto, N. Kawaguchi, K. Watanabe, A. Yamazaki, S. Kurosawa, S.

Method and Their Scintillation Properties”

Wakahara, Y. Yokota, A. Yoshikawa

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,“Optimization of Eu Concentration in LiSrAlF6 Crystalline Scintilaltor”

Anaheim, CA, USA (2012)

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,
Anaheim, CA, USA (2012)

57. K. Kamada, P. Prusa, M. Nikl, T. Yanagida, T. E. Endo, K. Tsutumi, Y. Usuki, A. Yoshikawa“2-Inch Size Crystal Growth of Ce:Gd3Al2Ga3O12 with Various Ce Concentration and Their

51. Y. Yokota, A. Yamaji, Y. Fujimoto, S. Kurosawa, N. Kawaguchi, K. Fukuda, A. Yoshikawa

Scintillation Properties”“Shape-Controlled Scintillator Single Crystals Grown by Micro-Pulling-Down Method”

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

Anaheim, CA, USA (2012)

Anaheim, CA, USA (2012)
58. D. Totsuka, T. Yanagida, Y. Fujimoto, Y. Yokota, F. Moretti, A. Vedda, A. Yoshikawa
52. A.Yoshikawa, S. Kurosawa, A. Suzuki, M. Seki, A. Yamaji, Y. Fujimoto, Y. Yokota, S. Nagata,“Effect of Bi-Codoping on the X-Ray Induced Afterglow in CsI:Tl”

T. Shikama, V. V. Kochurikhin

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,“Crystal Growth and Luminescent Properties of Nd-Doped Ca3(Nb,Ga)5O12”

Anaheim, CA, USA (2012)

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,
Anaheim, CA, USA (2012)

59. N. Kawaguchi, T. Yanagida, Y. Fujimoto, A. Yamazaki, K. Watanabe, K. Fukuda, Y. Futami, S.
Kurosawa, Y. Yokota, A. Yoshikawa

53. S. Kurosawa, Y. Yokota, A. Yoshikawa“Neutron Response with Different Sized Eu Doped LiCaAlF6 Crystals”“Scintillation Properties of Eu-Doped Scintillators”

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,

Anaheim, CA, USA (2012)

Anaheim, CA, USA (2012)6465

60. J. D. Parker, M. Harada, K. Hattori, S. Iwaki, S. Kabuki, Y. Kishimoto, H. Kubo, S. Kurosawa,

67. S. Kurosawa, Y. Yokota and A. Yoshikawa

K. Miuchi, H. Nishimura, T. Oku, T. Sawano, T. Shinohara, J.-I. Suzuki, A. Takada, T. Tanimori,“Temperature dependence of Ce:SrHfO3 ceramics scintillator”

K. UenoThe 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2“Neutron Imaging Detector Based on the μPIC Micro-Pixel Gaseous Chamber”

Oarai, Japan (2012)

IEEE 2012 Nuclear Science Symposium (IEEE/NSS) 2012/10/29-11/3 Disneyland Hotel,
Anaheim, CA, USA (2012)

68. S. Kurosawa, A. Suzuki, T. Shishido, Y. Yokota and A. Yoshikawa“Scintillation properties of lanthanum gadolinium pyrosilicate single crystals”

61. Y. Yokota, S. Kurosawa, M. Sato, K. Tota, A. Yamaji, Y. Futami, K. Onodera, and A. Yoshikawa“Shape-controlled Single Crystals with Rare-earth Elements Grown by μ-PD Method”

The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2
Oarai, Japan (2012)

International Symposium on Rare Earths 2012 in Okinawa for the 30th Anniversary of The
Rare Earth Society of Japan 2012/11/8-9 Okinawa, Japan (2012)

69. Y. Fujimoto, T. Yanagida, S. Wakahara, K. Watanabe, M. Sugiyama, Y. Miyamoto,H. Nanto, Y.
Yoshikawa

62. S. Kurosawa, Y. Yokota, and A. Yoshikawa“Comparative Study of Radiation Response of Crystalline- and Glassy- Calcium Metaborates”“Optical and Scintillation Properties of Eu-doped Fluoride Scintillator and Its Eu3+/Eu2+

The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2

Ratio”

Oarai, Japan (2012)

International Symposium on Rare Earths 2012/11/8-9 Okinawa, Japan (2012)
70. Y. Shoji, M. Seki, S. Kurosawa, Y. Yokota,V.V. Kochurikhin and A. Yoshikawa
63. A.Yoshikawa“Crystal growth and luminescent properties of Y3Al5O12 and sapphire (α-Al2O3) for a“Comparison between transparent ceramics and single crystals for scintillator application”

dosimeter”

ICC-IMR - ELyT workshop on materials science 2012/11/_26 Sendai, Japan (2012)

The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2
Oarai, Japan (2012)

64. A.Yoshikawa, K. Kamada, S. Kurosawa, Y. Yokota, J. Pejchal, Y. Futami, Y. Fujimoto, M.Seki,
M.Nikl

71. S. Wakahara, Y. Fujimoto, S. Suzuki, T. Yanagida, J. Pejchal, Y. Yokota, S. Kurosawa and A.

“Study on large-light-output scintillators I - Ce:GAGG”

Yoshikawa

The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2“Development of borate glass scintillators activated with copper for thermal neutron detection”

Oarai, Japan (2012)

The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2
Oarai, Japan (2012)

65. Yoshikawa, K. Nishimoto, Y. Yokota, S. Kurosawa“Study on large-light-output scintillators II - Eu:SrI2”

72. S. Suzuki, Y. Yokota, S. Wakahara , A. Yamaji, Y. Fujimoto, N. Kawaguchi, K. Fukuda, S.

The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2

Kurosawa, A. Yoshikawa

Oarai, Japan (2012)“Eu concentration dependence of optical and scintillation properties for Eu : LiSrAlF6 crystals”
The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2

66. Y. Yokota, S. Kurosawa, A. Yoshikawa

Oarai, Japan (2012)“Doping effects on scintillation properties for Ce:LiYF4 single crystals”
The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2
Oarai, Japan (2012)6667

73. M. Seki, S. Kurosawa, T. Shishido, J. Pejchal, Y. Yokota and A. Yoshikawa

76. B. Domestic conferences“Scintillation property of a Ce-doped Gd3Al3Ga2O12 Crystal Grown by the Floating Zone

国内学会

Method”
The 8th International Workshop on Ionizing Radiation Monitoring (IWIRM8) 2012/12/1-2
Oarai, Japan (2012)

1. 吉川彰“真空紫外域に発光する新規発光結晶の開発”
大阪大学レーザー研シンポジウム 2012 2012/4/17-18 大阪大学

74. Y. Yokota, M. Kitahara, S. Kurosawa, M. Sato, K. Tota, K. Onodera, A. Yoshikawa“Annealing

effects

for

Ca3NbGa3Si2O14

piezoelectric

singlecrystals

grown

by

2. 横田有為， 二見能資， 佐藤真人， 遠田一重， 藤本裕， 黒澤俊介， 小野寺晃， 吉

micro-pulling-down method”

川彰

The 8th Asian Meeting on Ferroelectrics (AMF-8) 2012/12/9-14 Pattaya, Thailand (2012)“平板状及びチューブ状 Ca3NbGa3Si2O14 圧電結晶の結晶育成と特性評価”
第 29 回強誘電体応用会議(FMA29) 2012/4/23-26 コープイン京都

75. M. Kitahara, Y. Yukota Y. Futami, S. Kurosawa, Y. Fujimoto, M. Sato, K. Tota, K. Onodera,
A.Yoshikawa

3. 河口範明，柳田健之，藤本裕，二見能資，渡辺賢一，山崎淳，福田健太郎，黒澤俊介，“Fabrication and physical properties of Ca3Nb(Ga1-xAlx)3Si2O14 Piezoelectric materials”

横田有為，吉川彰

The 8th Asian Meeting on Ferroelectrics (AMF-8) 2012/12/9-14 Pattaya, Thailand (2012)“LiF/CaF2 共晶体の中性子応答特性”
第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山大学
4. 鈴木彬，黒澤俊介，藤本裕，永田晋二，山路晃広，四竈樹男，横田有為，吉川彰“Yb:Y3Al5O12 単結晶材料の育成および発光特性の評価”
第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山大学
5. 関真冬，黒澤俊介，二見能資，横田有為，宍戸統悦，湯蓋邦夫，菊地昌枝，吉川彰“Ce 添加 Gd3(Al,Ga)5O12 シンチレーターの温度依存性”
第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山大学
6. 高橋嘉彦，山崎淳，渡辺賢一，瓜谷章，河口範明，福田健太郎，石津澄人，柳田健之，
吉川彰“発光波長特性を用いた中性子/ガンマ線弁別に関する研究”第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山
大学

68

69

7. 川端勇矢，丸山秀典，山崎 淳，渡辺賢一，瓜谷 章，河口範明，福田健太郎，石津澄人，

13. 水本哲矢，谷森達，窪秀利，Parker Joseph，水村好貴，岩城智，澤野達哉，中村輝石，

柳田健之，吉川 彰

松岡佳大，古村翔太郎，佐藤快，中村祥吾，身内賢太朗，高田淳史，岸本祐二，上野一“BNCT 中性子場モニタを目的とした光ファイバ型検出器の開発”

樹，株木重人，黒澤俊介，田中真伸，池野正弘，内田智久

第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山“SMILE14：電子飛跡検出型コンプトンカメラ(ETCC)の新データ取得システムの性能評

大学価”
日本物理学会 2012 年秋季大会 2012/9/11-14 京都産業大学

8. 鈴木祥太朗，吉川彰，河口範明，山路晃広，若原慎吾，藤本裕，福田健太郎，二見能資，
横田有為，黒澤俊介

14. 宍戸統悦、湯葢邦夫、森孝雄、工藤邦男、岡田繁、野村明子、菅原孝昌、手嶋勝弥、大“Eu:LiSrAlF6 シンチレータ結晶における Eu 添加濃度の最適化”

石修治、吉川彰

第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山“RCo2B2（R＝希土類元素）の硬さおよび耐酸化性”

大学

セラミックス協会第 25 回秋季シンポジウム 2012/9/19-21 名古屋大学

9. 西本けい，横田有為，黒澤俊介，藤本裕，小島孝広，二反田文雄，古川保典，吉川彰

15. 黒澤俊介、横田有為、鈴木彬、吉川彰“マイクロ引下げ法による Eu 添加 SrI2 単結晶の作製とシンチレーション特性評価”“SPS 法によるシンチレータ材料の開発”

第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山

セラミックス協会第 25 回秋季シンポジウム 2012/9/19-21 名古屋大学

大学
16. 藤本裕、柳田健之、若原慎吾、鈴木祥太郎、吉川彰
10. 横田有為，佐藤真人，二見能資，遠田一重，黒澤俊介，小野寺晃，吉川彰“育成雰囲気を制御して育成した Ca3NbGa3Si2O14 圧電結晶の物性評価”“Na2B4O7 ガラスの光学及びシンチレーション特性”
セラミックス協会第 25 回秋季シンポジウム 2012/9/19-21 名古屋大学

第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山大学

17. 黒澤俊介、横田有為、吉川彰“シンチレータの開発”

11. 北原正典，横田有為，二見能資，黒澤俊介，藤本 裕，佐藤真人，遠田一重，小野寺晃，

大洗研究会 2012/9/27 秋葉原 UDX

吉川彰“Ca3NbGa3Si2O14 圧電材料における元素置換効果”

18. 横田有為、黒澤俊介、山路晃広、吉川彰

第 73 回応用物理学会学術講演会（2012 年秋季講演会） 2012/9/11-14 愛媛大学・松山“マイクロ引き下げ法を用いた大口径バルク単結晶育成の可能性”

大学

第 42 回結晶成長国内会議（NCCG-42） 2012/11/9-11 九州大学筑紫キャンパス

12. 古村翔太郎，谷森達，窪秀利，Parker Joseph，水村好貴，水本哲矢，岩城智，澤野達哉，

19. 西本けい、横田有為、黒澤俊介、藤本裕、吉川彰

中村輝石，松岡佳大，佐藤快，中村祥吾，身内賢太朗，高田淳史，岸本祐二，上野一樹，“チャンバー着脱型 μ-PD を用いた Eu：SrI2 単結晶の結晶育成”

株木重人，黒澤俊介

第 42 回結晶成長国内会議（NCCG-42） 2012/11/9-11 九州大学筑紫キャンパス“電子飛跡検出型コンプトンカメラにおける飛跡取得アルゴリズムの改良 III”
日本物理学会 2012 年秋季大会 2012/9/11-14 京都産業大学

20. 鈴木祥太朗、横田有為、若原慎吾、山路晃広、藤本裕、河口範明、福田健太郎、黒澤俊
介、吉川彰“μ-PD 法による Eu 添加 LiSAF 単結晶の育成および Eu 最適濃度の探索”
第 42 回結晶成長国内会議（NCCG-42） 2012/11/9-11 九州大学筑紫キャンパス

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21. 吉川彰，横田有為，黒澤俊介，藤本裕，山路晃広，西本けい

29. J. Pejchal, K. Fukuda, V. Babin, S. Kurosawa, Y. Yokota, M. Nikl, A. Yoshikawa “Luminescence“フッ化物共晶体を使った新しいシンチレータの開発”

properties of VUV single crystal scintillator based on high temperature modi cation of

第 7 回日本フラックス成長研究発表会 2012/12/7 物質・材料研究機構

BaLu2F8”
第 23 回光物性研究会 2012/12/7-8 大阪市立大学

22. 山路晃広，藤本裕，黒澤俊介，横田有為，吉川彰“希土類フッ化物結晶(ReF3)のフラックス成長と光学特性”
第 7 回日本フラックス成長研究発表会 2012/12/7 物質・材料研究機構

30. 関真冬, Vladimir V. Kochurikhin, 黒澤俊介, 鈴木彬, 山路晃弘, 藤本裕, 若原慎吾, Jan
Pejchal, 横田有為, 吉川彰“Dy 添加 Y3Al5O12 結晶の発光特性”

23. 湯葢邦夫，森 孝雄，田中雅彦，岡田 繁，工藤邦男，野村明子，菅原孝昌，戸澤慎一郎，第 23 回光物性研究会 2012/12/7-8 大阪市立大学

小原和夫，鎌本喜代美，古曳重美，手嶋勝弥，大石修治，吉川 彰“ThCr2Si2 型基調 YCo2B2，YCo2B2C の合成および性質”
第 7 回日本フラックス成長研究発表会 2012/12/7 物質・材料研究機構
24. 宍戸統悦，湯葢邦夫，関 成之，野村明子，林好一，吉川彰，羽賀浩一“有機－無機転換工程の考察 ―SiC，ZnO 素材作製を例に―”
第 7 回日本フラックス成長研究発表会 2012/12/7 物質・材料研究機構
25. 横田有為，黒澤俊介，西本けい，吉川 彰“LiF／LiLuF4 共晶体シンチレータ結晶の合成と組織観察及びその発光特性”
第 7 回日本フラックス成長研究発表会 2012/12/7 物質・材料研究機構
26. 鈴木彬, 黒澤俊介, Jan Pejchal, Vladimir Babin, 藤本裕, 山路晃広, 関真冬, 二見能資, 横田有為, 湯蓋邦夫, 宍戸統悦, 菊地昌枝, Martin Nikl, 吉川彰“Ce 添加 Gd3Al3Ga2O12 ガーネット結晶の光学・シンチレーター特性における育成条
件依存性の実験的評価”
第 23 回光物性研究会 2012/12/7-8 大阪市立大学
27. 黒澤俊介, 上村博, 北原正典, 鈴木彬, 鈴木祥太郎, 庄子育宏, 関真冬, 二見能資, 藤本
裕, 西本けい, 山路晃宏, 若原慎吾, Jan Pejchal, 横田有為, 吉川彰“Ce 添加 SrHfO3 セラミックスの発光特性”
第 23 回光物性研究会 2012/12/7-8 大阪市立大学
28. 藤本裕, 柳田健之, 若原慎吾, 鈴木彬, 関真冬, 黒澤俊介, 吉川彰“CaB2O4 及び LiAlO2 結晶中の格子欠陥に起因する放射線励起発光”
第 23 回光物性研究会 2012/12/7-8 大阪市立大学

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List of Publications

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A.Original Papers[1] M. Cadatal-Raduban, T. Shimizu, K. Yamanoi, K. Takeda, M.H. Pham, T. Nakazato, N. Sarukura, N.

[8] Y. Futami, Y. Yokota, M. Sato, T. Yanagida, N. Kawaguchi, Y. Fujimoto, K. Tota, K. Onodera, A.
Yoshikawa,"Optical and scintillation properties of Ca3NbGa3Si2O14 single crystal grown by micro-pulling

Kawaguchi, K. Fukuda, T. Suyama, T. Yanagida, Y. Yokota, A. Yoshikawa,down method""Micro-pulling down method-grown Er3+:LiCaAlF6 as prospective vacuum ultraviolet laser

Journal of Crystal Growth 352 (2012) 129.

material"
Journal of Crystal Growth 362 (2013) 167.
[2] W. Drozdowski, K. Brylew, A. Chruscinska, K. Kamada, T. Yanagida, A. Yoshikawa,[9] M. Ieda, T. Ishimaru, S. Ono, N. Kawaguchi, K. Fukuda, T. Suyama, Y. Yokota, T. Yanagida, A.
Yoshikawa,"Filterless Ultraviolet Detector Based on Cerium Fluoride Thin Film Grown by Pulsed Laser"Scintillation yield enhancement in LuAG:Pr crystals following thermal annealing"

Deposition"

Optical Materials 34 (2012) 1975.

Japanese Journal of Applied Physics 51 (2012).

[3] Y. Fujimoto, K. Kamada, T. Yanagida, N. Kawaguchi, S. Kurosawa, D. Totsuka, K. Fukuda, K.

[10] K. Kamada, T. Yanagida, T. Endo, K. Tsutumi, Y. Usuki, M. Nikl, Y. Fujimoto, A. Fukabori, A.

Watanabe, A. Yamazaki, Y. Yokota, A. Yoshikawa,

Yoshikawa,"Lithium Aluminate Crystals as Scintillator for Thermal Neutron Detection""2 inch diameter single crystal growth and scintillation properties of Ce:Gd3Al2Ga3O12"

Ieee Transactions on Nuclear Science 59 (2012) 2252.

Journal of Crystal Growth 352 (2012) 88.

[4] A. Fukabori, L.Q. An, A. Ito, V. Chani, K. Kamada, T. Goto, A. Yoshikawa,[11] K. Kamada, T. Yanagida, T. Endo, K. Tsutumi, M. Yoshino, J. Kataoka, Y. Usuki, Y. Fujimoto, A.

"Scintillation Characteristics of Undoped Sc2O3 Single Crystals and Ceramics"

Fukabori, A. Yoshikawa,

Ieee Transactions on Nuclear Science 59 (2012) 2594.

"Large size single crystal growth of Lu3Al5O12:Pr and their uniformity of scintillation
properties"[5] A. Fukabori, L.Q. An, A. Ito, V. Chani, K. Kamada, A. Yoshikawa, T. Ikegami, T. Goto,

Journal of Crystal Growth 352 (2012) 91.

"Correlation between crystal grain sizes of transparent ceramics and scintillation light yields"
Ceramics International 38 (2012) 2119.

[12] K. Kamada, T. Yanagida, J. Pejchal, M. Nikl, T. Endo, K. Tsutsumi, Y. Fujimoto, A. Fukabori, A.
Yoshikawa,[6] A. Fukabori, V. Chani, K. Kamada, A. Yoshikawa,"Growth of Yb-doped Y2O3, Sc2O3, and Lu2O3 single crystals by the micro-pulling-down"Crystal Growth and Scintillation Properties of Ce Doped Gd-3(Ga,Al)(5)O-12 Single Crystals"
Ieee Transactions on Nuclear Science 59 (2012) 2112.

technique and their optical and scintillation characterization"
Journal of Crystal Growth 352 (2012) 124.

[13] K. Kamada, T. Yanagida, J. Pejchal, M. Nikl, T. Endo, K. Tsutsumi, Y. Fujimoto, A. Fukabori, A.
Yoshikawa,[7] Y. Futami, T. Yanagida, Y. Fujimoto, V. Jary, J. Pejchal, Y. Yokota, M. Kikuchi, M. Nikl, A.
Yoshikawa,"Growth and Scintillation Properties of Pr Doped (Gd, Y)(3)(Ga, Al)(5)O-12 Single Crystals"
Ieee Transactions on Nuclear Science 59 (2012) 2126.

"Photoluminescence and scintillation of LGS (La3Ga5SiO14), LNGA
(La3Nb0.5Ga5.3Al0.2O14) and LTGA (La3Ta0.5Ga5.3Al0.2O14) single crystals"
Optical Materials 34 (2012) 1513.

[14] K. Kamada, T. Yanagida, J. Pejchal, M. Nikl, T. Endo, K. Tsutsumi, Y. Usuki, Y. Fujimoto, A.
Fukabori, A. Yoshikawa,"Scintillation properties of Ce doped Gd2Lu1(Ga,Al)(5)O-12 single crystal grown by the
micro-pulling-down method"
Journal of Crystal Growth 352 (2012) 35.

76

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[15] K. Kamada, T. Yanagida, J. Pejchal, M. Nikl, T. Endo, K. Tsutumi, Y. Fujimoto, A. Fukabori, A.

[22] J. Martincik, M. Nikl, S. Ishizu, A. Baratova, T. Cechak, K. Fukuda, T. Suyama, A. Beitlerova, A.

Yoshikawa,

Yoshikawa,"Crystal Growth of Ce Doped (Lu, Y)(3)(Ga, Al)(5)O-12 Single Crystal by the"Concentration Dependence of VUV-UV-Visible Luminescence of Nd3+ and Gd3+ in LuLiF4"

Micro-Puling-Down Method and Their Scintillation Properties"

Ieee Transactions on Nuclear Science 59 (2012) 2188.

Ieee Transactions on Nuclear Science 59 (2012) 2116.
[23] T. Murata, Y. Arikawa, K. Watanabe, K. Yamanoi, M. Cadatal-Raduban, T. Nagai, M. Kouno, K.

[16] K. Kamada, T. Yanagida, J. Pejchal, M. Nikl, T. Endo, K. Tsutumi, Y. Fujimoto, A. Fukabori, A.

Sakai, T. Nakazato, T. Shimizu, N. Sarukura, M. Nakai, T. Norimatsu, H. Nishimura, H. Azechi,

Yoshikawa,

A. Yoshikawa, S. Fujino, H. Yoshida, N. Izumi, N. Sato, H. Kan,

"Improvement of Scintillation Properties in Pr Doped Lu3Al5O12 Scintillator by Ga and Y"Fast-Response and Low-Afterglow Cerium-Doped Lithium 6 Fluoro-Oxide Glass Scintillator

Substitutions"for Laser Fusion-Originated Down-Scattered Neutron Detection"

Ieee Transactions on Nuclear Science 59 (2012) 2130.

Ieee Transactions on Nuclear Science 59 (2012) 2256.

[17] K. Kamada, T. Yanagida, J. Pejchal, M. Nikl, T. Endo, K. Tsutumi, Y. Usuki, Y. Fujimoto, A.

[24] Y. Ohashi, N. Yasui, Y. Yokota, A. Yoshikawa, and T. Den,

Fukabori, A. Yoshikawa,"Submicron-diameter phase-separated scintillator fibers for high-resolution X-ray imaging""Growth and scintillation properties of Pr doped Gd-3(Ga,Al)(5)O-12 single crystals"

Applied Physics Letters 102 (2013) 051907.

Journal of Crystal Growth 352 (2012) 84.
[18] N. Kawaguchi, T. Yanagida, Y. Fujimoto, Y. Futami, K. Fukuda, S. Kajimoto, H. Fukumura, Y.

[25] J. Pejchal, Y. Fujimoto, V. Chani, T. Yanagida, Y. Yokota, A. Yoshikawa, M. Nikl, A. Beitlerova,"Modifications of micro-pulling-down method for the growth of selected Li-containing crystals

Yokota, A. Yoshikawa,for neutron scintillator and VUV scintillation crystals""VUV Luminescence With Nd Doped KCaF3 Under X-Ray Excitation"

Journal of Crystal Growth 360 (2012) 127.

Ieee Transactions on Nuclear Science 59 (2012) 2183.
[19] S. Kurosawa, M. Sugiyama, T. Yanagida, Y. Yokota, A. Yoshikawa,[26] J. Pejchal, K. Fukuda, M. Nikl, N. Kawaguchi, Y. Yokota, T. Yanagida, A. Yoshikawa,"Luminescence and Scintillation Properties of VUV Scintillation Crystals Based on Lu-Admixed"Temperature dependence of the scintillation properties of Ce:GSO and Ce:GSOZ"BaY2F8"

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers

Ieee Transactions on Nuclear Science 59 (2012) 2177.

Detectors and Associated Equipment 690 (2012) 53.
[20] S. Kurosawa, T. Yanagida, Y. Yokota, A. Yoshikawa,"Crystal Growth and Scintillation Properties of Fluoride Scintillators"
Ieee Transactions on Nuclear Science 59 (2012) 2173.
[21] J. Martincik, S. Ishizu, K. Fukuda, T. Suyama, T. Cechak, A. Beitlerova, A. Yoshikawa, M. Nikl,[27] R. Simura, S. Kawai, K. Sugiyama, T. Yanagida, T. Sugawara, T. Shishido, A. Yoshikawa,"Valence state of dopant and scintillation properties of Ce-doped Sr3Y(BO3)(3) crystal"
Journal of Crystal Growth 362 (2013) 296.
[28] R. Simura, T. Yagi, K. Sugiyama, T. Yanagida, A. Yoshikawa,"Growth of Ce-doped Ba3Gd(BO3)(3) and Sr3Gd(BO3)(3) single crystals by"Concentration dependence study of VUV-UV-visible luminescence of Nd3+ and Gd3+ inmicro-pulling-down method and analysis of luminescence properties"

LuLiF4"

Journal of Crystal Growth 362 (2013) 145.

Optical Materials 34 (2012) 1029.

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[29] M. Sugiyama, Y. Fujimoto, T. Yanagida, A. Yamaji, Y. Yokota, A. Yoshikawa,[38] K. Watanabe, Y. Arikawa, K. Yamanoi, M. Cadatal-Raduban, T. Nagai, M. Kouno, K. Sakai, T.

"Growth and scintillation properties of Nd-doped Lu3Al5O12 single crystals by Czochralski and

Nazakato, T. Shimizu, N. Sarukura, M. Nakai, T. Norimatsu, H. Azechi, A. Yoshikawa, T.

micro-pulling-down methods"

Murata, S. Fujino, H. Yoshida, N. Izumi, N. Satoh, H. Kan,

Journal of Crystal Growth 362 (2013) 178.

"Pr or Ce-doped, fast-response and low-afterglow cross-section-enhanced scintillator with Li-6
for down-scattered neutron originated from laser fusion"[30] M. Sugiyama, T. Yanagida, Y. Fujimoto, D. Totsuka, Y. Yokota, S. Kurosawa, Y. Futami, A.
Yoshikawa,"Crystal Growth and Scintillation Properties of Ho-Doped Lu3Al5O12 Single Crystals"
Ieee Transactions on Nuclear Science 59 (2012) 2141.
[31] M. Sugiyama, T. Yanagida, D. Totsuka, Y. Yokota, Y. Futami, Y. Fujimoto, A. Yoshikawa,"Crystal growth and luminescence properties of Cr-doped YAlO3 single crystals"
Journal of Crystal Growth 362 (2013) 157.
[32] M. Sugiyama, Y. Yokota, Y. Fujimoto, T. Yanagida, Y. Futami, S. Kurosawa, A. Yoshikawa,"Dopant segregation in rare earth doped lutetium aluminum garnet single crystals grown by the
micro-pulling down method"
Journal of Crystal Growth 352 (2012) 110.
[33] A. Suzuki, S. Kurosawa, T. Shishido, J. Pejchal, Y. Yokota, Y. Futami, A. Yoshikawa,"Fast and High-Energy-Resolution Oxide Scintillator: Ce-Doped (La,Gd)(2)Si2O7"
Applied Physics Express 5 (2012).
[34] D. Totsuka, T. Yanagida, Y. Fujimoto, J. Pejchal, Y. Yokota, A. Yoshikawa,"Growth and scintillation properties of pure Csl crystals grown by micro-pulling-down method"
Optical Materials 34 (2012) 1087.
[35] D. Totsuka, T. Yanagida, Y. Fujimoto, Y. Yokota, F. Moretti, A. Vedda, A. Yoshikawa,"Afterglow Suppression by Codoping with Bi in CsI:Tl Crystal Scintillator"
Applied Physics Express 5 (2012).
[36] D. Totsuka, T. Yanagida, M. Sugiyama, Y. Fujimoto, J. Pejchal, Y. Yokota, A. Yoshikawa,"Investigations of Optical and Scintillation Properties of (Lu0.1Y0.9)AlO3: Nd0.1%"
Ieee Transactions on Nuclear Science 59 (2012) 2156.

Journal of Crystal Growth 362 (2013) 288.
[39] A. Yamaji, T. Yanagida, Y. Yokota, K. Kamada, A. Yoshikawa, J. Pejchal,"Quantitive Research of the Crystallinity of Pr Doped Lu3Al5O12"
Ieee Transactions on Nuclear Science 59 (2012) 2135.
[40] A. Yamaji, Y. Yokota, T. Yanagida, N. Kawaguchi, Y. Futami, Y. Fujimoto, A. Yoshikawa,"Crystal growth and dopant segregation of Ce:LiSrAlF6 and Eu:LiSrAlF6 crystals with highdopant concentrations"
Journal of Crystal Growth 352 (2012) 106.
[41] T. Yanagida, Y. Fujimoto, K. Kamada, D. Totsuka, H. Yagi, T. Yanagitani, Y. Futami, S. Yanagida,
S. Kurosawa, Y. Yokota, A. Yoshikawa, M. Nikl,"Scintillation Properties of Transparent Ceramic Pr:LuAG for Different Pr Concentration"
Ieee Transactions on Nuclear Science 59 (2012) 2146.
[42] Y. Yokota, M. Sato, Y. Futami, K. Tota, T. Yanagida, K. Onodera, A. Yoshikawa,"Crystal growth and physical properties of shape-controlled La3Ta0.5Ga5.5O14 single crystals
by micro-pulling-down method"
Journal of Crystal Growth 352 (2012) 147.
[43] Y. Yokota, A. Yamaji, T. Yanagida, N. Kawaguchi, K. Fukuda, A. Yoshikawa,"The control of mean ionic radius at Y site by Lu co-doping for Ce:LiYF4 single crystals"
Journal of Crystal Growth 362 (2013) 243.
[44] Y. Yokota, T. Yanagida, N. Kawacuchi, K. Fukuda, A. Yoshikawa,"Effects of ionic radius control at Y site by Sc doping on crystal growth and physical properties
for Ce:LiYF4 single crystals"
Journal of Crystal Growth 352 (2012) 95.

[37] D. Totsuka, T. Yanagida, M. Sugiyama, Y. Fujimoto, Y. Yokota, A. Yoshikawa,"Crystal growth and characterization of Tm doped mixed rare-earth aluminum perovskite"
Materials Research Bulletin 47 (2012) 993.

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[45] A. Yoshikawa, T. Yanagida, Y. Fujimoto, S. Kurosawa, Y. Yokota, A. Yamaji, M. Sugiyama, S.

B. Proceedings Papers

Wakahara, Y. Futami, M. Kikuchi, M. Miyamoto, H. Sekiwa, M. Nikl,"LPE Growth and Scintillation Properties of (Zn,Mg)O Single Crystalline Film"
Ieee Transactions on Nuclear Science 59 (2012) 2286.

[1] Y. Miyamoto, T. Ohono, Y. Takei, H. Nanto, T. Kurobori, T. Yanagida, A. Yoshikawa, Y. Nagashima
and T. Yamamoto"Ionizing Radiation Sensor Utilizing RPL in Ag-doped Phosphate Glass"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[2] T. Yanagida, Y. Fujimoto, A. Yamaji, N. Kawaguchi, K. Kamada, D. Totsuka, K. Yamanoi, N.
Ryosukec, Y. Futami, S. Kurosawa, Y. Yokota, T. Shimizu, A. Yoshikawa, N. Sarkura"Study of the correlation of scintillation decay and emission wavelength"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[3] Y. Fujimoto, T. Yanagida, S. Kurosawa, A. Yoshikawa"Luminescence Properties and Radiation Response of Sodium Borate Glasses Scintillators"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[4] Y. Futami, T. Yanagida, Y. Fujimoto, J. Pejchal, S. Kurosawa, M. Sugiyama, Y. Yokota, A.
Yoshikawa, A. Ito, T. Goto
"Optical and scintillation properties of Sc2O3, Y2O3 and Lu2O3 transparent ceramics
synthesized by SPS method"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[5] S. Kurosawa, T. Yanagida, Y.Yokota, A. Yoshikawa"Optical and Scintillation property of BaF2 doped with rear earth"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[6] S. Kurosawa, T. Yanagida, Y. Yokota, Akira Yoshikawa"Optical and Scintillation property of PbF2 with some dopant"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[7] S. Kurosawa, T. Yanagida, J. Pejchal, K. Fukuda, N. Kawaguchi, S.Ishizu, T. Suyama, M. Nakagawa,
Y.Yokota,M. NIkl, A. Yoshikawa"Evaluation of Nd:BaY2F8 for VUV scintillator"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[8] A. Yamaji, T.i Yanagida, Y.Yokota, N.Kawaguchi, A.Yoshikawa"Czochralski growth and scintillation properties of Tm doped K2NaLuF6"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)82

83

[9] A.Yamaji, T.Yanagida, Y. Yokota, N. Kawaguchi, K. Watanabe, A. Yamazaki, A. Yoshikawa"Eu and Rb co-doped LiCaAlF6 scintillators for neutron detection"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[10] N. Kawaguchi, T. Yanagida, Y. Fujimoto, A. Yamaji, A.Yamazaki, K. Watanabe, S.Kurosawa, Y.
Futami, Y.Yokota,A. Yoshikawa"Neutron detection with 3d-transition metal ions doped LiCaAlF6 scintillator"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[11] D. Totsuka, T. Yanagida, Y. Fujimoto, Y. Yokota and A. Yoshikawa"Growth and scintillation properties of (Lu1-x Tmx)2SiO5 [x=0.001, 0.01, 0.1, 1]"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[12] D. Totsuka, T. Yanagida, M. Sugiyama, Y. Fujimoto, Y. Yokota and A. Yoshikawa"Optical and Scintillation Properties of Nd doped YAlO3 with different concentrations"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[13] M. Sugiyama, Y. Fujimoto, T. Yanagida, D. Totsuka, c, Y. Yokota, and A. Yoshikawa"Nd-doped Lu3Al5O12 single crystalline scintillator for X-ray imaging"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[14] M. Sugiyama, T. Yanagida, Y. Yokota, Y. Fujimoto, and A. Yoshikawa"Crystal growth and luminescence properties of Pr-doped LuLiF4 single crystals"

Copies of Selected Papers

The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)[15] S.Wakahara, T.Yanagida, Y.Fujimoto, M.Sugiyama, Y.Yokota, A.Ikesue, A.Yoshikawa"Evaluation of the scintillation properties of Yb3+ ion doped Lu2O3 ceramics"
The 7th International Workshop on Individual Monitoring of Ionizing Radiation (2012)84

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CERAMICS INTERNATIONAL Volume: 38 Issue: 3 Pages: 2119-2123 Published: APR 2012

MATERIALS RESEARCH BULLETIN Volume: 47 Issue: 4 Pages: 993-997 Published: APR 2012

Correlation between crystal grain sizes of transparent ceramics and scintillation
light yields

Crystal growth and characterization of Tm doped mixed rare-earth aluminum
perovskite

Fukabori 1; LQ. An 1; A. Ito 1; V. Chani 1; K. Kamada 2; A. Yoshikawa 1,3; T. Ikegami 4; T. Goto 1

D. Totsuka 1,2; T. Yanagida 3; M. Sugiyama 1; Y. Fujimoto 1; Y. Yokota 1; A. Yoshikawa 1,3

1. Tohoku Univ, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Furukawa Co Ltd, Tsukuba, Ibaraki 3050856, Japan
3. Tohoku Univ, NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
4. Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

Abstract:
Light yields of Y2O3 ceramics are different from specimen to specimen. Nature of this phenomenon is
not clear yet. Furthermore, origin of emission peaks for Y2O3 is not well understood. The results reported
suggest that the emission derived from trapped excitons originates from the defects accumulated in thegrain boundaries of the ceramics. In this paper, average grain size is introduced in order to evaluate
defects inside the ceramics. Relationship between average crystal grain size and scintillation light yield isdemonstrated. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved

E-mail Address:
akihirofukabori@gmail.com

Site Address:
http://www.sciencedirect.com/science/article/pii/S0272884211009072

1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Nihon Kessho Kogaku Co Ltd, Gunma 3740047, Japan
3. New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

Abstract:
In this work, we present results of structural characterization and optical properties including radio
luminescence of (LuxGdyY0.99-x-yTm0.01)AP single crystal scintillators for (x, y) = (C.30, 0.19), (0,0.19) and (0, 0) grown by the micro-pulling-down (mu-PD) method. The grown crystals were single
phase materials with perovskite structure (Pbnm) as confirmed by XRD and had a good crystallinity. The
distribution of the crystal constituents in growth direction was evaluated, and significant segregation of
Lu and Gd was detected in (Lu0.30Gd0.19Y0.50Tm0.01)AP sample. The crystals demonstrated 70%
transmittance in visible wavelength range and some absorption bands due to Tm3+, Gd3+ and color
centers were exhibited in 190-900 nm. The radioluminescence measurement under X-ray irradiation
demonstrated several emission peaks ascribed to 4f-4f transitions of Tm3+ and Gd3+. The ratio ofemission intensity in longer wavelength range was increased when Y was replaced by Lu or Gd. (C) 2012
Elsevier Ltd. All rights reserved.

E-mail Address:
totsuka@imr.tohoku.ac.jp

Site Address:
http://www.sciencedirect.com/science/article/pii/S0025540812000189

86

87

OPTICAL MATERIALS Volume: 34 Issue: 7 Pages: 1029-1033 Published: MAY 2012

OPTICAL MATERIALS Volume: 34 Issue: 7 Pages: 1087-1091 Published: MAY 2012

Growth and scintillation
micro-pulling-down method

properties

of

pure

Csl

crystals

grown

by

D. Totsuka 1,2; T. Yanagida 4; Y. Fujimoto 1; J. Pejchal 3; Y. Yokota 1; A. Yoshikawa 1,4
1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Nihon Kessho Kogaku Co Ltd, Gunma 3740047, Japan
3. Acad Sci Czech Republic, Inst Phys, Prague 16253 6, Czech Republic
4. New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

Concentration dependence study of VUV-UV-visible luminescence of Nd3+ andGd3+ in LuLiF4
J. Martincik 1; S. Ishizu 4; K. Fukuda 3; T. Suyama 3; T. Cechak 2; A. Beitlerova 1; A. Yoshikawa 4; M.
Nikl 1
1. Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic
2. Czech Tech Univ, Fac Nucl Sci & Phys Engn, CR-11519 Prague, Czech Republic
3. Tokuyama Co Ltd, Sendai, Miyagi, Japan
4. Tohoku Univ, IMRAM, Sendai, Miyagi 980, Japan

Abstract:
Single crystals of pure cesium iodide (Csl) have been grown from the melt using micro-pulling-down

Abstract:(mu-PD) method. Two kinds of crucible (graphite one and quartz one) were used for the growth and the

An overview of absorption and luminescence characteristics of Nd3+ and Gd3+ centers in a LiLuF4

grown crystals were investigated by X-ray diffraction (XRD) and X-ray rocking curve (XRC) analysis.

single crystal host is provided. Single crystals doped with the above rare earth ions were prepared by

The XRD analysis did not confirm any impurity phases and a sub-grain structure was observed for eachmicropulling-down technique in the form of rods a few cm long with a diameter of about 2 mm.

sample in the rocking curve measurement. Under X-ray irradiation, strong STE emission peaks around

Excitation and emission spectra and fast decay kinetics in VUV and UV spectral regions were measured

300 nm were observed together with some luminescence related to unintentionally present impurities. The

at room temperature. The observed absorption and emission peaks are due to the 5d-4f and 4f-4f optical

STE emission peaks are characterized by fast decay times of several ns and about 20 ns which aretransitions of Nd3+ and Gd3+ centers. Concentration dependence of the decay kinetics is also discussed.

interpreted as the on-center-type STE (V-K + e) and off-center type STE (H + F) recombinations,(C) 2012 Elsevier B.V. All rights reserved.

respectively. The light yield of the STE-related emissions has been estimated to be 3000 ph/MeV. Other
emission peaks were observed at 410 nm and 515 nm. The former one can be related to Br-contamination

E-mail Address:

and it is characterized by a relatively slow decay time of 6 mu s. Concerning the latter one at 515 nm,

jiri.martincik@fjfi.cvut.cz

similar luminescence was observed for the water-doped Csl grown by Bridgman method. (C) 2012

Site Address:

Elsevier B.V. All rights reserved.

http://www.sciencedirect.com/science/article/pii/S0925346711005714

E-mail Address:
totsuka@imr.tohoku.ac.jp

Site Address:
http://www.sciencedirect.com/science/article/pii/S0925346712000092

88

89

APPLIED PHYSICS EXPRESS Volume: 5 Issue: 5 Article Number: 052601 Published: MAY 2012

JAPANESE JOURNAL OF APPLIED PHYSICS Volume: 51 Issue: 6 Article Number: 062202 Part: Part 1 Published: JUN 2012

Afterglow Suppression by Codoping with Bi in CsI:Tl Crystal Scintillator

Filterless Ultraviolet Detector Based on Cerium Fluoride Thin Film Grown byPulsed Laser Deposition

D. Totsuka 1,3; T. Yanagida 2; Y. Fujimoto 3; Y. Yokota 3; F. Moretti 4; A. Vedda 4; A. Yoshikawa 2,3
1. Nihon Kessho Kogaku Co Ltd, Gunma, Japan
2. New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi 9808579, Japan
3. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
4. Univ Milano Bicocca, Dept Mat Sci, I-20125 Milan, Italy

M. Ieda 1; T. Ishimaru 1; S. Ono 1; N. Kawaguchi 2,3; K. Fukuda 2,3; T. Suyama 2; Y. Yokota 3; T. Yanagida
4; A. Yoshikawa 3
1. Nagoya Inst Technol, Nagoya, Aichi 4668555, Japan
2. Tokuyama Corp, Chiyoda Ku, Tokyo 1008983, Japan
3. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
4. Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808579, Japan

Abstract:
Single crystals of CsI, CsI:Tl, and CsI:Tl, Bi were grown by the vertical Bridgman method. We studied
the effect of Bi3+ codoping on the CsI:Tl X-ray-induced afterglow. Thermally stimulated luminescence

Abstract:

measurements were carried out in order to investigate the role of traps. The results showed a remarkable

We report on an ultraviolet photoconductive detector based on cerium fluoride (CeF3) thin films. CeF3

reduction of afterglow, of about an order of magnitude, and of trap concentration by Bi codoping. These

thin films were grown on quartz glass substrates by the pulsed laser deposition (PLD) method.

improvements could be related to a possible role of Bi in the compensation of intrinsic nonstoichiometry

Optimization of the substrate temperature using the PLD method successfully increased the photocurrent

defects. (c) 2012 The Japan Society of Applied Physics

of the CeF3 detector. The photocurrent increases linearly up to at least 600 V. The sample grown at 670 K
shows the highest crystallinity and orientation. This sample shows a response in the wavelength range

E-mail Address:

below 310 nm without any filters. Additionally, the measured dielectric-breakdown field of this detector

totsuka@imr.tohoku.ac.jp

exceeded 15 kV/cm. (c) 2012 The Japan Society of Applied Physics

Site Address:
http://apex.jsap.jp/link?APEX/5/052601/

E-mail Address:
cja16502@stn.nitech.ac.jp

Site Address:
http://jjap.jsap.jp/link?JJAP/51/062202/

90

91

OPTICAL MATERIALS Volume: 34 Issue: 9 Pages: 1513-1516 Published: JUL 2012

Photoluminescence and scintillation of LGS (La3Ga5SiO14),(La3Nb0.5Ga5.3Al0.2O14) and LTGA (La3Ta0.5Ga5.3Al0.2O14) single crystals

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 147-150 Published: AUG 1 2012

LNGA

Y. Futami 1; T. Yanagida 2; Y. Fujimoto 1; V. Jary 3; J. Pejchal 1,3; Y. Yokota 1; M. Kikuchi 1; M. Nikl 3; A.

Crystal growth and physical properties of shape-controlled La3Ta0.5Ga5.5O14 single
crystals by micro-pulling-down method
Y. Yokota 1; M. Sato 1,2; Y. Futami 3; K. Tota 2; T. Yanagida 3; K. Onodera 2; A. Yoshikawa 1,3
1. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 980, Japan
2. TDK Corp, Tokyo, Japan
3. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi 980, Japan

Yoshikawa 1,2
1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
3. AS CR, Inst Phys, Prague 16253, Czech Republic

Abstract:
Abstract:

Columnar-shaped La3Ta0.5Ga5.5O14 single crystals with a-axis and c-axis crystal orientations along the

To examine scintillation response of piezoelectric crystals the Am-241 5.5 MeV alpha-ray excited

growth direction grown by the micro-pulling-down method and their physical properties wereemission spectra of langasite family crystals, LGS (La3Ga5SiO14), LNGA (La3Nb0.5Ga5.3Al0.2O14)

investigated. All diffraction peaks of the XRD pattern were identified as the langasite-type structure andand LTGA (La3Ta0.5Ga5.3Al0.2O14) were measured. Dominating emission bands were observed at 378

the a-axis and c-axis lengths were a=8.239 angstrom and c = 5.124 angstrom, respectively. In the XRC

nm for LGS, 556 nm for LNGA and 425 nm for LTGA. X-ray excited radioluminescence intensity ofmeasurement, a relatively sharp single peak was observed in the omega scan and the full width of halfthese crystals was quantitatively compared with BGO standard scintillator. Photoluminescence 2D-spectra

maximum was 82.1 arcsec. According to the chemical analysis by the EPMA system, the main phase waswere measured as well and compared with radioluminescence ones. In LTGA also photoluminescencecomposed of LTG with the cation ratio of La:Ta:Ga = 3.31:0.465:5.22 and the LTG crystal included

decays were measured for two dominant contributing emission centers. Observed emission bands within

secondary phase, La-Ta-O system, in the periphery area. The piezoelectric constant d(11) that was

300-360 nm and beyond 400 nm most probably belong to self-trapped or trapped excitons and latticemeasured using the plate-shape LTG crystal was 6.7 pC/N. (c) 2012 Published by Elsevier B.V.

defects, respectively. (c) 2012 Elsevier B.V. All rights reserved.

E-mail Address:
E-mail Address:

yokota@imr.tohoku.ac.jp

yoshisuke.futami@imr.tohoku.ac.jp

Site Address:

Site Address:

http://www.sciencedirect.com/science/article/pii/S0022024812000474

http://www.sciencedirect.com/science/article/pii/S0925346712001322

92

93

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 129-132 Published: AUG 1 2012

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 124-128 Published: AUG 1 2012

Optical and scintillation properties of Ca3NbGa3Si2O14 single crystal grown by
micro-pulling down method

Growth of Yb-doped Y2O3, Sc2O3, and Lu2O3 single crystals by the
micro-pulling-down technique and their optical and scintillation characterization

Y. Futami 1; Y. Yokota 1; M. Sato 2; T. Yanagida 3; N. Kawaguchi 1; Y. Fujimoto 1; K. Tota 2; K. Onodera 2;

A. Fukabori 1; V. Chani 1; K. Kamada 2; A. Yoshikawa 1,3
1. Tohoku Univ, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Furukawa Co Ltd, Tsukuba, Ibaraki 3050856, Japan
3. Tohoku Univ, NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

A. Yoshikawa 1,3
1. Tohoku Univ, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. TDK Corp, Kisakata, Nikaho 0180193, Japan
3. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

Abstract:
Abstract:

In this report, growth of Yb-doped sesqui-oxide crystals of Y2O3, Sc2O3, and Lu2O3 by the

The Ca3NbGa3Si2O14 (CNGS) crystal was grown by the micro-pulling down (mu PD) method and themicro-pulling-down technique and their scintillation performance are discussed. Growth of these crystals

annealing effect on physical properties of CNGS crystal was investigated in this study. And the effects ofis difficult mostly as a result of their extremely high melting point of around 2400 degrees C.

oxygen content on the physical properties were systematically studied. Additionally, Photoluminescence

Nevertheless, appropriate design of the thermal zone and careful control of the growth parameters(PL)-Mapping and radioluminescence spectra of CNGS were observed. The absorption peaks wereallowed fabrication of these crystals of reasonable quality. Based on the results of measurements ofobserved around 350 and 500 nm. This absorption at 500 nm was very sensitive to a quantity of excess

emission spectra under alpha-ray excitation and pulse height spectra under alpha-ray and gamma-ray

oxygen in the CNGS crystal. In contrast, it is expected that the absorption of 350 nm is related to a cation

excitations, scintillation characteristics of above crystals including emission wavelength and light yields

or anion defect. PL-Mapping indicated the emission around 400 nm by excitation at 270 and 350 nm

under alpha-ray and gamma-ray excitations were examined. Additionally, decay kinetics of thesewavelengths. The emission at 400 nm is considered to originate from trapped electron at an anion ormaterials under alpha-ray excitation were evaluated. (c) 2012 Elsevier B.V. All rights reserved.

cation defect. The emission of the Alpha-ray excited spectra was very similar in comparison with
PL-Mapping. (c) 2012 Elsevier B.V. All rights reserved.

E-mail Address:
akihirofukabori@gmail.com

E-mail Address:

Site Address:

f23@live.jp

http://www.sciencedirect.com/science/article/pii/S0022024812000760

Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024812000784

94

95

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 110-114 Published: AUG 1 2012

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 106-109 Published: AUG 1 2012

Dopant segregation in rare earth doped lutetium aluminum garnet single crystals
grown by the micro-pulling down method

Crystal growth and dopant segregation of Ce:LiSrAlF6 and Eu:LiSrAlF6 crystals
with high dopant concentrations

M. Sugiyama 1; Y. Yokota 1; Y. Fujimoto 1; T. Yanagida 2; Y. Futami 1; S. Kurosawa 1; A. Yoshikawa 1,2

A. Yamaji 1; Y. Yokota 1; T. Yanagida 2; N. Kawaguchi 3; Y. Futami 2; Y, Fujimoto 1,2,3; A. Yoshikawa 1,2

1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr, Aoba Ku, Sendai, Miyagi 9808579, Japan
3. Tokuyama Corp, Shibuya Ku, Tokyo 1508383, Japan

Abstract:
Nd, Ho, Er, and Tm doped lutetium aluminum garnet (LuAG) single crystals were grown using the
micro-pulling down (mu-PD) method. The crystals were produced from the melts containing 3 mol% of
the dopants. The axial and radial dopant distribution were measured by electron probe micro analysis.
Nd3+ and Ho3+ ions concentrated in the rim (k(0) < 1) and the radial concentration showed concave
curvature. k(0) is the segregation coefficient of the dopant with respect to the given host phase. In thecase of Er3+ and Tm3+ ions, the k(0) value is considered to be nearly 1 and the radial dopant distribution
profiles were almost flat. (c) 2011 Elsevier B.V. All rights reserved.

E-mail Address:
yosikawa@tagen.tohoku.ac.jp

Site Address:
http://www.sciencedirect.com/science/article/pii/S002202481101058X

96

Abstract:
Ce:LiSrAlF6 and Eu:LiSrAlF6 crystals with different dopant concentrations were grown by the
micro-pulling-down method. The crystals with high dopant crystal included the secondary phase asclusters with the plate shape in BSE images. The secondary phases were identified CeF3 and EuF2,
respectively, by the EDS analysis and powder-XRD measurement. Eu concentration against the Sr sites inthe Eu 2% doped LiSAF crystal were most uniform in the range 0.9-1.6 atm% using the EPMA. (C) 2012
Elsevier B.V. All rights reserved.

E-mail Address:
yosikawa@tagen.tohoku.ac.jp

Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024812001169

97

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 95-98 Published: AUG 1 2012

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 91-94 Published: AUG 1 2012

Effects of ionic radius control at Y site by Sc doping on crystal growth and physicalproperties for Ce:LiYF4 single crystals

Large size single crystal growth of Lu3Al5O12:Pr and their uniformity of
scintillation properties

Y. Yokota 1; T. Yanagida 2; N. Kawacuchi 1,3; K. Fukuda 1,3; A. Yoshikawa 1,2

K. Kamada 1; T. Yanagida 2; T. Endo 1; K. Tsutumi 1; M. Yoshino 4; J. Kataoka 4; Y. Usuki 1; Y. Fujimoto 2;

1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
3. Tokuyama Corp, Yamaguchi 7458648, Japan

A. Fukabori 2; A. Yoshikawa 2,3
1. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan
2. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
4. Waseda Univ, Sch Adv Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan

Abstract:
We have grown the Sc and Ce doped LiYF4 [ Sc,Ce:LYF] single crystals with various Sc and Ce
concentrations and investigated the effects of ionic radius control at Y site by Sc doping on crystal growthand physical properties. All grown Sc,Ce:LYF crystals included the milky and transparent parts and theamount of the milky parts in the crystals was smaller than that of the Ce:LYF crystal. The milky parts
were composed of the LYF main phase and YF3 inclusion and in contrast, the transparent parts were asingle phase of LYF. The lattice parameters were almost constant for all Sc,Ce:LYF crystals. Full width at
half maximum of the XRC for Sc5%Ce5%:LYF crystal was 86.8 arcsec and the effective segregation
coefficients of Ce3+ ion in the Sc3%Ce3% and 5c5%Ce5%:LYF crystals were 0.21 and 0.18, respectively.
In the transmittance and photoluminescence spectra, no clear effects of Sc co-doping were observed. (C)2012 Elsevier B.V. All rights reserved.

E-mail Address:
yokota@imr.tohoku.ac.jp

Abstract:
Pr-doped Lu3Al5O12 (Pr:LuAG) single crystals were grown by the Czochralski method. The crystal wasseeded-grown in the [100] direction. Dimensions up to 100 mm in length and 92 mm in diameter wereachieved without cracking. Using 10 x 10 x 10 mm size sample coupled with photomultiplier(Hamamatsu R3998), energy resolution of 4.6% at 662 keV was achieved. Uniformity of light yield andenergy resolution was also evaluated in whole crystal. The deviations of light output, energy resolution,and decay time were +/- 7.9%, 7.2%, and 4.8%, respectively. (C) 2011 Elsevier B.V. All rights reserved.

E-mail Address:
k-kamada@furukawakk.co.jp

Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024811010025

Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024812001182

98

99

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 88-90 Published: AUG 1 2012

2 inch diameter single
Ce:Gd3Al2Ga3O12

crystalgrowthandscintillation

JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 84-87 Published: AUG 1 2012

properties

ofGrowth and scintillation properties of Pr doped Gd3(Ga,Al)5O12 single crystals
K. Kamada 1; T. Yanagida 2; J. Pejchal 3; M. Nikl 3; T. Endo 1; K. Tsutumi 1; Y. Usuki 1; Y. Fujimoto 2; A.

K. Kamada 1; T. Yanagida 2; T. Endo 1; K. Tsutumi 1; Y. Usuki 1; M. Nikl 4; Y. Fujimoto 2; A. Fukabori 2; A.

Fukabori 2; A. Yoshikawa 2,4
1. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan
2. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. AS CR, Inst Phys, Prague 16253, Czech Republic
4. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

Yoshikawa 2,3
1. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan
2. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
4. AS CR, Inst Phys, Prague 16253, Czech Republic

Abstract:
Abstract:

Pr:Gd-3(Ga,Al)(5)O-12 single crystals were grown by the micro-pulling down (mu-PD) method. All

2inch size Ce:Gd3Al2Ga3O12 (Ce:GAGG) single crystals were grown by the Czochralski (Cz) method

grown crystals were greenish and transparent with 3.0 mm in diameter, 15-30 mm in length. Neither

using [100] oriented seed. The crystals were up to 120 mm in length and 50 mm in diameter werevisible inclusions nor cracks were observed. Luminescence and scintillation properties were measured.

achieved and had no cracks. Luminescence and scintillation properties were measured. In order to

The substitution at the Al3+ sites by Ga3+ in garnet structure has been studied. In these crystals, Pr3+

determine light yield, the energy spectra were collected under 662 keV gamma-ray excitation (Cs-137

5d-4f emission is observed with 340 nm wavelength. Pr1%:Gd3Ga3Al2O12 shows highest emission

source) were detected by a with avalanche photodiode (APD) S8664-55(Hamamatsu).The light yield ofintensity. The light yield of Pr:Gd3Ga3Al2O12 sample with 3 mm phi x 1 mm size was around 4500

CeGAGG sample was calibrated from Fe-55 direct irradiation peak to APD. The light yield was aroundphoton/MeV. Scintillation decay time was 7.9 ns (0.5%), 46 ns (0.7%) and 214 ns (98.8%). (C) 2012

46,000 photon/MeV. Energy resolution was 4.9%@662 keV for 5 x 5 x 1 mm sample. The theoretical

Elsevier B.V. All rights reserved.

density of CeGAGG is 6.63 g/cm(3). (C) 2011 Elsevier B.V. All rights reserved.

E-mail Address:
E-mail Address:

k-kamada@furukawakk.co.jp

k-kamada@furukawakk.co.jp

Site Address:

Site Address:

http://www.sciencedirect.com/science/article/pii/S0022024812001170

http://www.sciencedirect.com/science/article/pii/S0022024811010153

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JOURNAL OF CRYSTAL GROWTH Volume: 352 Issue: 1 Pages: 35-38 Published: AUG 1 2012

OPTICAL MATERIALS Volume: 34 Issue: 12 Special Issue: SI Pages: 1975-1978 Published: OCT 2012

Scintillation properties of Ce doped Gd2Lu1(Ga,Al)5O12 single crystal grown by the
micro-pulling-down method

Scintillation yield enhancement in LuAG:Pr crystals following thermal annealing
W. Drozdowski 1; K. Brylew 1; A. Chruscinska 1; K. Kamada 2,3; T. Yanagida 3; A. Yoshikawa 3
1. Nicholas Copernicus Univ, Inst Phys, Div Optoelect, PL-87100 Torun, Poland
2. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan
3. Tokohu Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, JapanK. Kamada 1,4; T. Yanagida 2; J. Pejchal 3; M. Nikl 3; T. Endo 1; K. Tsutsumi 1; Y. Usuki 1; Y. Fujimoto 2; A.
Fukabori 2; A. Yoshikawa 2,4
1. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan
2. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. AS CR, Inst Phys, Prague 16253, Czech Republic
4. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

Abstract:
Ce:Gd2Lu1(Ga,Al)(5)O-12 single crystals were grown by the micro-pulling down (mu-PD) method. Allgrown crystals were yellow and transparent with 3.0 mm in diameter, 15-30 mm in length. Neither visible
inclusions nor cracks were observed. Luminescence and scintillation properties were measured. The
substitution at the Al3+ sites by Ga3+ and at the Lu3+ sites by Gd3+ in garnet structure has been studied.
In these crystals, Ce3+ 4f-5d emission is observed with 500-530 nm wavelength. The decay accelerates
with increasing Ga and Ce concentration. Cel%: Gd2Lu1Ga3Al2O12 shows the highest emission
intensity. The light yield of Ce:Gd2Lu1Ga3Al2O12 sample with 3 mm phi x 1 mm size was around22,000 photon/MeV using calibration from Fe-55 direct irradiation peak to APD. Scintillation decay time
was around 50 ns. The theoretical density is 6.88 g/cm(3). (C) 2012 Elsevier B.V. All rights reserved.

E-mail Address:

Abstract:
Effects of thermal annealing in various atmospheres of Czochralski-grown Lu3Al5O12:Pr (LuAG:Pr)
crystals on their scintillation yield and energy resolution are discussed. It is shown that annealing in argon,
air, or oxygen at 1373 K for 48 h is a simple way of achieving a ten-odd percent increase of yield together
with an improvement of energy resolution. High temperature thermoluminescence measurements indicate
significant reductions of trap concentrations in the annealed crystals compared to the "as grown" ones,
which correlates well with the observed yield increase. A simple model is proposed to predict further
available yield enhancement in LuAG:Pr upon thermal annealing. (C) 2011 Elsevier B.V. All rights
reserved.

E-mail Address:
wind@fizyka.umk.pl

Site Address:
http://www.sciencedirect.com/science/article/pii/S0925346711005404

k-kamada@furukawakk.co.jp

Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024811009808

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2594-2600 Part: Part 3 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2286-2289 Part: Part 2 Published: OCT 2012

Scintillation Characteristics of Undoped Sc2O3 Single Crystals and Ceramics

LPE Growth and Scintillation Properties of (Zn,Mg)O Single Crystalline Film

A. Fukabori 1; LQ. An 1; A. Ito 1; V. Chani 1; K. Kamada 1,2; T. Goto 1; A. Yoshikawa 1

A. Yoshikawa 1,2; T. Yanagida 2; Y. Fujimoto 1; S. Kurosawa 1; Y. Yokota 1; A. Yamaji 1; M. Sugiyama 1; S.

1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Furukawa Co Ltd, Tsukuba, Ibaraki 3050856, Japan

Wakahara 1; Y. Futami 1; M. Kikuchi 1; M. Miyamoto 3; H. Sekiwa 3; M. Nikl 4
1. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
3. Mitsubishi Gas Chem MGC Co Inc, Katsushika Ku, Tokyo 1250051, Japan
4. Inst Phys AS CR, Vvi, Prague 16253, Czech Republic

Abstract:
Detailed scintillation properties of Sc2O3, especially gamma-ray response, are not well studied becauseof low density and low effective atomic number of this compound. They are reported in this paper. Sc2O3
single crystals grown by the micro-pulling-down method and Sc2O3 translucent ceramics produced by
the spark plasma sintering are analyzed. Optical, luminescence, and scintillation properties of thesesingle- and poly-crystalline solids are discussed and compared based on examination of their opticaltransmittance, radio-luminescence spectra, light yields under gamma-ray excitation, non-proportionality,
energy resolution, and scintillation decay profiles. Spectrally corrected light yields of the Sc2O3 single
crystals and Sc2O3 ceramics were approximately 7,700 and 19,200 photons/MeV, respectively.

E-mail Address:
akihirofukabori@gmail.com

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6265348

Abstract:
Among the direct wide band-gap semiconductors, ZnO is an attractive scintillator for alpha particle
monitoring. However, the undoped ZnO has a dominant slow luminescence around 500-600 nm due tolattice defects. In this study, the Mg-substituted ZnO ((Zn,Mg)O) single crystalline films with highcrystallinity are investigated. Mg doping is found to improve the lattice order and suppress slow
luminescent component around 500-600 nm. (Zn,Mg) O single crystalline films were grown by the
Liquid Phase Epitaxy (LPE) method. Alpha-ray excited radio-luminescence spectra of (Zn,Mg) O film
show only one emission peak around 400 nm and decay time of a few nanoseconds. This emission is
assigned to free exciton. Light yield of LPE grown (Zn,Mg) O film is evaluated of about 90% of BGO.

E-mail Address:
yoshikawa@imr.tohoku.ac.jp

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6217290

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2256-2259 Part: Part 2 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2252-2255 Part: Part 2 Published: OCT 2012

Fast-Response and Low-Afterglow Cerium-Doped Lithium 6 Fluoro-Oxide Glass
Scintillator for Laser Fusion-Originated Down-Scattered Neutron Detection

Lithium Aluminate Crystals as Scintillator for Thermal Neutron Detection
Y. Fujimoto 1; K. Kamada 1; T. Yanagida 2,1; N. Kawaguchi 3; S. Kurosawa 1; D. Totsuka 4; K. Fukuda 3; K.

T. Murata 1,2,3; Y. Arikawa 3; K. Watanabe 3; K. Yamanoi 3; M. Cadatal-Raduban 3; T. Nagai 3; M. Kouno

Watanabe 5; A. Yamazaki 5; Y. Yokota 1; A. Yoshikawa 2,1
1. Tohoku Univ, IMRAM, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, NICHe, Sendai, Miyagi 9808579, Japan
3. Tokuyama Corp, Tokyo 1508383, Japan
4. Nihon Kessho Kogaku Co Ltd, Gunma 3740047, Japan
5. Nagoya Univ, Nagoya, Aichi 4648603, Japan3; K. Sakai 3; T. Nakazato 3; T. Shimizu 3; N. Sarukura 3; M. Nakai 3; T. Norimatsu 3; H. Nishimura 3; H.

Azechi 3; A. Yoshikawa 4; S. Fujino 5; H. Yoshida 6; N. Izumi 7; N. Sato 8; H. Kan 8
1. Kumamoto Univ, Fac Educ, Kumamoto 8608555, Japan
2. Kumamoto Univ, Masters Course Educ, Kumamoto 8608555, Japan
3. Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan
4. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
5. Kyushu Univ, Art Sci & Technol Ctr Cooperat Res, Kasuga, Fukuoka 8168580, Japan
6. Ceram Res Ctr Nagasaki, Hasami 8593726, Japan
7. Lawerence Livermore Natl Lab, Livermore, CA 94550 USA
8. Hamamatsu Photon KK, Dev Bur, Hamamatsu, Shizuoka 4311202, Japan

Abstract:
Undoped and Cu+-doped lithium aluminate LiAlO2 singe crystals have been grown using micro-pulling
down (mu-PD) technique. After cutting and polishing, optical properties and scintillation characteristicsof the crystals were examined. From the transmittance measurements, Cu+-doped crystal showed

Abstract:

absorption band around 270 nm, which is corresponding to the transition between Cu(+)3d(10) and

Scintillation properties of Ce3+-doped 20Al(PO3)(3)-80LiF glasses were investigated in order to seek a3d(9)4sstates. Ultra violet emission peak appeared around 360 nm under 270 nm excitation. The emission

candidate for down-scattered neutron scintillator in nuclear fusion diagnostics. The decay constant of

decay time was calculated to be about 17.3 mu s. Am-241 5.5 MeV alpha-ray excited radioluminescence

APLF80+3Ce with 5.5 MeV alpha particles from Am-241 radioisotope excitation was measured to be

spectra exhibited intense luminescence band at 360 nm due to the Cu(+)3d(9)4s-3d(10) transitions. By the32.1 ns. Moreover, sufficiently low afterglow decay profile and improved light output of APLF80+3Ce

pulse height spectra Cf-252 neutron source excitation, the scintillation light output of Cu+-doped LiAlO2

were experimentally demonstrated.

was found to be about 8700 ph/n.

E-mail Address:

Site Address:

mu-rata@educ.kumamoto-u.ac.jp

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6218140

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6307903

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2188-2192 Part: Part 2 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2183-2187 Part: Part 2 Published: OCT 2012

Concentration Dependence of VUV-UV-Visible Luminescence of Nd3+ and Gd3+ in
LuLiF4VUV Luminescence With Nd Doped KCaF3 Under X-Ray Excitation
N. Kawaguchi 1,2,3; T. Yanagida 4; Y. Fujimoto 5; Y. Futami 5; K. Fukuda 6; S. Kajimoto 7; H. Fukumura 7;

J. Martincik 1; M. Nikl 1; S. Ishizu 2; A. Baratova 3; T. Cechak 4; K. Fukuda 2; T. Suyama 2; A. Beitlerova

Y. Yokota 5; A. Yoshikawa 2,4
1. Tokuyama Corp, Tokyo 1008983, Japan
2. Tohoku Univ, IMR, Sendai, Miyagi 9808577, Japan
3. Tohoku Univ, Dept Chem, Grad Sch Sci, Sendai, Miyagi 9808577, Japan
4. Tohoku Univ, NICHe, Sendai, Miyagi 9808579, Japan
5. IMR Tohoku Univ, Sendai, Miyagi 9808577, Japan
6. Tokuyama Corp, Shunan 7450024, Japan
7. Tohoku Univ, Dept Chem, Grad Sch Sci, Sendai, Miyagi 9808578, Japan1; A. Yoshikawa 5
1. Inst Phys AS CR, Prague 16253, Czech Republic
2. Tokuyama Co, Tokyo 1008983, Japan
3. LN Gumilyov Eurasian Natl Univ, Astana 010008, Kazakhstan
4. Czech Tech Univ, FNSPE, Prague 11519, Czech Republic
5. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

Abstract:
The research and development of new VUV scintillators includes also LuLiF4 single crystals doped by
Nd3+. Due to their lower light yield, the Gd3+ codoping is studied as a tool to improve an energy transferfrom the host to Nd3+ emission centers and increase the light yield consequently. Emission spectra anddecays with respect to the different concentration of Gd and Nd ions are studied and discussed as well.

E-mail Address:
jiri.martincik@fjfi.cvut.cz

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6200902

Abstract:
Radioluminescence properties of Nd doped KCaF3 single crystals were studied. X-ray excited
luminescence spectra were measured in the vacuum ultraviolet (VUV) region by using a custom-madedevice filled with nitrogen atmosphere. As a result, VUV luminescence was observed at 190 nm.
Radioluminescence intensity due to the core-valence luminescence (CVL) of KCaF3 decreased withincreasing of Nd3+ concentration.

E-mail Address:
kawaguchi@imr.tohoku.ac.jp

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6308738

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2177-2182 Part: Part 2 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2173-2176 Part: Part 2 Published: OCT 2012

Luminescence and Scintillation Properties of VUV Scintillation Crystals Based on
Lu-Admixed BaY2F8

Crystal Growth and Scintillation Properties of Fluoride Scintillators
S. Kurosawa 1; T. Yanagida 2; Y. Yokota 1; A. Yoshikawa 2,1
1. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi 9808579, Japan

J. Pejchal 1,2; K. Fukuda 3; M. Nikl 2; N. Kawaguchi 3; Y. Yokota 1; T. Yanagida 4; A. Yoshikawa 1
1. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
2. Inst Phys AS CR, Prague 16253, Czech Republic
3. Tokuyama Co, Chiyoda Ku, Tokyo 1008983, Japan
4. Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808577, Japan

Abstract:
Nd and Tm-doped Lu-admixed BaY2F8 crystals were grown by micro-pulling-down method. Lu wasadded to modify the host matrix to suppress the unwanted energy transfer from exciton levels to theTm3+ 4f-levels. It was found that low Tm and Nd codoping does not bring much improvement of thescintillation performance and that 1% Nd-doped BaY0.8Lu1.2F8 single crystal reached nearly the same
scintillation efficiency as the LaF3:Nd8% one, which is known as a suitable candidate for a VUVscintillator. It is clear there is a considerable room for an optimization of this material by changing the
Lu/Y ratio and increasing the content of Nd. On the other hand, very high Tm concentrations (around20%) suppress the excitonic emission (and also the 4f-4f emission) while increasing the 5d-4f one
significantly.

E-mail Address:

Abstract:
Fluoride single crystals have a wide band gap. Thus, we were interested in studying the scintillation
properties of fluoride single crystals. We investigated the scintillation properties of fluoride crystals
grown by the micro-pulling-down and annealing methods. The time required to grow crystals using thesemethods is lesser than that using conventional methods such as the Czochralski and Bridgman methods.
Both ZnF2 and PbF2 exhibited small light outputs of less than 1,000 photons/MeV, while BaF2 and CeF3
exhibited light outputs of similar to 6,000 and similar to 2,000 photons/MeV, respectively. In addition,
BaF2 is a well-known fast scintillator, but it also has a slow component. We tested a BaF2 crystal with a
Ce/La co-dopant and observed the suppression of the slow component.

E-mail Address:
kurosawa@imr.tohoku.ac.jp

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6180198

pejchalj@imr.to-hoku.ac.jp

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6218206

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2156-2160 Part: Part 2 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2146-2151 Part: Part 2 Published: OCT 2012

Investigations of Optical and Scintillation Properties of (Lu0.1Y0.9)AlO3: Nd0.1%

Scintillation Properties of Transparent Ceramic Pr:LuAG for Different Pr
Concentration

D. Totsuka 1; T. Yanagida 2; M. Sugiyama 3; Y. Fujimoto 3; J. Pejchal 3; Y. Yokota 3; A. Yoshikawa 3
1. Nihon Kessho Kogaku Co Ltd, Gunma 3740047, Japan
2. Tohoku Univ, NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
3. Tohoku Univ, IMR, Aoba Ku, Sendai, Miyagi 9808577, JapanT. Yanagida 1; Y. Fujimoto 2; K. Kamada 3; D. Totsuka 4; H. Yagi 5; T. Yanagitani 5; Y. Futami 2; S.
Yanagida 6; S. Kurosawa 2; Y. Yokota 2; A. Yoshikawa 2; M. Nikl 7
1. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
2. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. Furukawa Co Ltd, Tsukuba, Ibaraki 3050856, Japan
4. Nihon Kessho Kogaku Co Ltd, Tatebayashi Gunma 3740047, Japan
5. Konoshima Chem Co Ltd, Mitoya, Kagawa 7691103, Japan
6. Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan
7. ASCR, Inst Phys, Prague 16253 6, Czech Republic

Abstract:(Lu0.1Y0.9)AlO3 : Nd0.1% crystal was grown by the mu-PD method and pure YAP single crystal was
prepared as a reference sample. Then, two annealing procedures were performed for each sample at 1350
degrees C and 1500 degrees C for 20 hours in oxygen atmosphere to improve the crystallinity andscintillation properties. The XRD results for all the samples were consistent with JCPDS data (#33-0041)
and possessed a space group of orthorhombic Pbnm while no impurity peaks were observed. The FWHM
values of X-ray rocking curve measurements of the as-grown crystals and the crystals annealed at 1500
degrees C were 70 and 200 arcsec, respectively. It can be due to the onset of decomposition. In thetransmittance measurements, intense absorption peaks were observed approximately at 240 and 290 nm
and they were consistent with the bands for color centers: the two-electron F center and one-electron F+
center, respectively. These absorptions were enhanced by Lu substitution. The radio-luminescence spectra
show several emission peaks due to Nd3+ 4f-4f transitions and the most intense of which were assigned
to F-2(2)(5/2) - F-4(5/2), F-2(2)(5/2) - (4)G(7/2) and F-2(2)(5/2) - (4)G9(/2) transitions at 395, 540 and
550 nm, respectively. The light yield after annealing annealing was as high as 5025 +/- 500 (N-phe/MeV)
when using Si-APD (S8664). The scintillation decay time constants were evaluated to be 3.44-3.80 mu s
for each sample. Afterglow upon X-ray excitation of the as-grown and annealed samples coupled withPIN Si-photodiode was found to be approximately 1200 and 1000 ppm after 100 ms.

E-mail Address:
totsuka@imr.tohoku.ac.jp

Abstract:
We manufactured transparent optical ceramic of Pr 0.2-1% doped Lu3Al5O12 (Pr:LuAG) by the sintering
method. We compare its optical and scintillation properties with the single crystal counterpart grown by
the conventional Czochralski method. So far the scintillation ceramic of Pr: LuAG appeared inferior to its
single crystal analog especially in terms of light yield. However, in the present case our ceramic Pr
0.25%-doped sample exhibited by 20% higher light yield compared to single crystal under gamma-ray
excitation. Furthermore, in the ceramic sample the slower scintillation decay components were
suppressed and the defect related host emission as well. The optimized technology of optical ceramics
thus appears very competitive to single crystals and opens great practical prospectives for the former
materials in the field of fast scintillators.

E-mail Address:
yanagida@imr.tohoku.ac.jp

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6190751

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6170584

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2141-2145 Part: Part 2 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2135-2140 Part: Part 2 Published: OCT 2012

Crystal Growth and Scintillation Properties of Ho-Doped Lu3Al5O12 Single
Crystals

Quantitive Research of the Crystallinity of Pr Doped Lu3Al5O12
A. Yamaji 1; T. Yanagida 2; Y. Yokota 1; K. Kamada 3; A. Yoshikawa 1; J. Pejchal 1
1. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808577, Japan
3. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan

M. Sugiyama 1; T. Yanagida 2; Y. Fujimoto 1; D. Totsuka 3,1; Y. Yokota 1; S. Kurosawa 1; Y. Futami 1; A.
Yoshikawa 2,1
1. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808579, Japan
3. Nihon Kessho Kogaku CO Ltd, Gunma 3740047, Japan

Abstract:
In this study, we investigated the relation between crystallinity and scintillation properties of Pr:LuAG

Abstract:

crystals grown by Czochralski (Cz) method. The crystallinity was determined as the dislocation density

The crystals of 0.1, 0.5, 1, and 3% Ho doped Lu3Al5O12 (Ho:LuAG) grown by the micro-pulling-down

using the X-ray rocking curve technique. The scintillation pulse-height spectra were collected under 662

method were examined for their scintillation properties. At wavelengths longer than 300 nm, Ho: LuAG

keV Cs-137 gamma-ray excitation to evaluate the light yield and energy resolution. It was confirmed thatcrystals demonstrated around 60% transparency with many absorption peaks attributed to Ho3+

both the light yield and energy resolution correlates with the crystalinity; however, the other factors also

4f(10)-4f(10) transitions. When excited by Am-241 alpha-ray to obtain radio luminescence spectra, broad

have an influence.

host emission and four sharp Ho3+ 4f(10)-4f(10) emission peaks were detected in the visible region.
Light yields and decay time profiles of the samples irradiated by Cs-137 gamma-ray were measured using

E-mail Address:

photomultiplier tubes R7600 (Hamamatsu). Ho 0.5%:LuAG showed the highest light yield of 3100 +/-yamaji-a@imr.tohoku.ac.jp

310 photons/MeV among the present samples. The decay time profiles were well reproduced by two

Site Address:

components exponential approximation consisting of 0.5-1 mu s and 3-6 mu s.

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6179359

E-mail Address:
msugiyama500@gmail.com

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6180202

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2130-2134 Part: Part 2 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2126-2129 Part: Part 2 Published: OCT 2012

Improvement of Scintillation Properties in Pr Doped Lu3Al5O12 Scintillator by Ga
and Y Substitutions

Growth and Scintillation Properties of Pr Doped (Gd, Y)3(Ga, Al)5O12 Single
Crystals

K. Kamada 1; T. Yanagida 2; J. Pejchal 3; M. Nikl 3; T. Endo 1; K. Tsutumi 1; Y. Fujimoto 2; A. Fukabori 2;

K. Kamada 1; T. Yanagida 2; J. Pejchal 3; M. Nikl 3; T. Endo 1; K. Tsutsumi 1; Y. Fujimoto 2; A. Fukabori 2;

A. Yoshikawa 2

A. Yoshikawa 2

1. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan
2. Tohoku Univ, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. AS CR, Inst Phys, Prague 16253, Czech Republic

1. Furukawa Co Ltd, Mat Res Lab, Tsukuba, Ibaraki 3050856, Japan
2. Tohoku Univ, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. AS CR, Inst Phys, Prague 16253, Czech Republic

Abstract:

Abstract:

Pr : (Lu, Y)(3)(Ga, Al)(5)O-12 single crystals were grown by the micro-pulling down (mu-PD) method.

Pr:(Gd, Y)(3)(Ga, Al)(5)O-12 single crystals were grown by the mu-PD method with RF heating system.

Luminescence and scintillation properties were measured. The substitution phenomenon in the Lu3+ sites

Pr3+ 5d-4f emission within 300-350 nm, Pr3+ 4f-4f emission within 480-650 nm and Gd3+ 4f-4f

with Y3+ and Al3+ sites with Ga3+ in garnet structure has been studied. Pr3+ 5d-4f emission withinemission at 310 nm are observed in Pr:(Gd, Y)(3)(Ga, Al)(5)O-12 crystals. In order to determine light

300-400 nm accompanied by weak Pr3+ 4f-4f emission in 480-650 nm were observed in Ga 0-60 at.%yield, the energy spectra were measured under 662 keV gamma-ray excitation (Cs source), detected by a

substituted samples. Only Pr3+ 4f-4f emission was observed in Ga 80 at.% substituted sample. The light

PMT H6521 (Hamamatsu). The light output of Pr1%:Gd1Y2Ga3Al2O12 sample was of about one fifth ofyield of Pr1% : Lu2Y1Ga2Al2O12 sample was almost the same as that of Cz grown Pr:LuAG standard.

that of the Cz grown Pr: LuAG standard sample, i.e., around 4,000 photon/MeV. Two component

Two-component scintillation decay of 17.9 ns (93%) and 68.0 ns (7%) were obtained using the PMT andscintillation decay shows the decay times (intensity) of 5.7 ns(5%), 38.7 ns (31%) and 187 ns (63%) using

digital oscilloscope TDS5032B. Slower decay components were reduced by Ga and Y substitution in

the PMT and digital oscilloscope TDS5032B detection.

LuAG structure.

E-mail Address:
E-mail Address:

k-kamada@furukawakk.co.jp

k-kamada@furukawakk.co.jp

Site Address:

Site Address:

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6327752

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6198315

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2116-2119 Part: Part 2 Published: OCT 2012

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Volume: 59 Issue: 5 Pages: 2112-2115 Part: Part 2 Published: OCT 2012

Crystal Growth of Ce Doped (Lu, Y)3(Ga, Al)5O12 Single Crystal by theMicro-Puling-Down Method and Their Scintillation Properties

Crystal Growth and Scintillation Properties of Ce Doped Gd3(Ga,Al)5O12 Single
Crystals

K. Kamada 1; T. Yanagida 2; J. Pejchal 3; M. Nikl 3; T. Endo 1; K. Tsutumi 1; Y. Fujimoto 2; A. Fukabori 2;

K. Kamada 1; T. Yanagida 2; J. Pejchal 3; M. Nikl 3; T. Endo 1; K. Tsutsumi 1; Y. Fujimoto 2; A. Fukabori 2;

A. Yoshikawa 2

A. Yoshikawa 2

1. Furukawa Co Ltd, Mat Res Lab, Ibaraki 3050856, Japan
2. Tohoku Univ, IMR, Sendai, Miyagi 9808577, Japan
3. AS CR, Inst Phys, Prague 16253, Czech Republic

1. Furukawa Co Ltd, Mat Res Lab, Ibaraki 3050856, Japan
2. Tohoku Univ, IMR, Sendai, Miyagi 9808577, Japan
3. AS CR, Inst Phys, Prague 16253, Czech Republic

Abstract:

Abstract:

Ce : (Lu, Y)(3)(Ga, Al)(5)O-12 single crystals were grown by the mu-PD method with RF heating system.

Ce1%, 2% and 3% doped Gd-3(Ga,Al)(5)O-12 (GAGG) single crystals were grown by the Cz method.

In these crystals, Ce3+ 4f-5d emission is observed within 500-530 nm wavelength. Emission peak shifts

Luminescence and scintillation properties were measured. Light yield change along the growth direction

to shorter wavelength and the decay accelerates with increasing Ga concentration. In the case of Ce :and effects of Ce concentration on scintillation properties in Ce:GAGG were studied. Ce3+ 5d-4f

Lu2Y1 (Ga, Al)(5)O-12 series, the Ce0.2% Lu2Y1Ga3Al2O12 crystal showed the highest emission

emission within 520-530 nm was observed in the Ce:GAGG crystals. The Ce1%:GAGG sample with 3 x

intensity. In order to determine light yield, the energy spectra were measured under 662 keV (a) over bar

3 x 1 mm size showed the highest light yield of 46000 photon/MeV. The energy resolution was-ray excitation (Cs-137 source) and detection by an APD S8664-55(Hamamatsu). The light yield was

7.8%@662 keV. With increasing solidification fraction, the LY were decreased. It is proposed that thecalibrated from Fe-55 direct irradiation peak to APD. The light yield of Ce0.2%: Lu2Y1Ga3Al2O12

increase of Ga concentration along the growth direction is the main cause of the decrease of LY. The

sample was of about 30,000 photon/MeV. Dominant scintillation decay time was of about 50 ns.

scintillation decay times were accelerated with increasing Ce concentration in the Ce: GAGG crystals.
The scintillation decay times were 92.0 ns, 79.1 ns and 68.3 ns in the Ce1, 2 and 3% GAGG, respectively.

E-mail Address:
k-kamada@furukawakk.co.jp

E-mail Address:

Site Address:

k-kamada@furukawakk.co.jp

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6151861

Site Address:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6212487

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APPLIED PHYSICS EXPRESS Volume: 5 Issue: 10 Article Number: 102601 Published: OCT 2012

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS
DETECTORS AND ASSOCIATED EQUIPMENT Volume: 690 Pages: 53-57 Published: OCT 21 2012

Fast and High-Energy-Resolution Oxide Scintillator: Ce-Doped (La,Gd)2Si2O7
Temperature dependence of the scintillation properties of Ce:GSO and Ce:GSOZ
1

1

1

A. Suzuki ; S. Kurosawa ; T. Shishido ; J. Pejchal

1,3

1

1

; Y. Yokota ; Y. Futami ; A. Yoshikawa

1,2

1. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi 9808579, Japan
3. Inst Phys AS CR, Prague 16253, Czech Republic

Abstract:
A novel scintillation crystal (Ce-0.01,Gd-0.90,La-0.09)(2)Si2O7 (Ce:La-GPS) was grown by the floatingzone method, and its optical and scintillation properties were investigated. The emission wavelength of
this material was 390 nm. Gamma ray excited pulse height and scintillation decay measurement showedthat Ce:La-GPS had a high energy resolution (FWHM) of 5% at 662 keV, high light output of 36,000
photons/MeV and fast scintillation decay time of 46 ns. (C) 2012 The Japan Society of Applied Physics

E-mail Address:
akira_suzuki@imr.tohoku.ac.jp

Site Address:
http://apex.jsap.jp/link?APEX/5/102601/

S. Kurosawa 1; M. Sugiyama 1; T. Yanagida 2; Y. Yokota 1; A. Yoshikawa 1,2
1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

Abstract:
The light output and decay times of Ce:GSO and Ce:GSOZ scintillators depend on Ce concentration andtemperature. We investigated the temperature dependence of the light output and the decay time for
Ce:GSO and Ce:GSOZ doped with 0.3 (only GSO), 0.5, 1.0, and 1.5 mol% Ce. These samples were
measured with a ruggedized photomultiplier (PMT) (Hamamatsu R6877A) at 175 degrees C (in thethermostat chamber). Up to 100 degrees C, the relative light output of all of the samples remained within
10% after correcting the PMT gain, which depends on the temperature. The decay times of the GS andGSOZ samples with the identical Ce concentrations were equal. Moreover, the quenching energy values
for all the samples were equivalent. (C) 2012 Elsevier BM. All rights reserved.

E-mail Address:
kurosawa@imr.tohoku.ac.jp

Site Address:
http://www.sciencedirect.com/science/article/pii/S0168900212006717

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JOURNAL OF CRYSTAL GROWTH Volume: 360 Special Issue: SI Pages: 127-130 Published: DEC 1 2012

JOURNAL OF CRYSTAL GROWTH Volume: 362 Pages: 145-148 Published: JAN 1 2013

Modifications of micro-pulling-down method for the growth of selected
Li-containing crystals for neutron scintillator and VUV scintillation crystals

Growth of Ce-doped Ba3Gd(BO3)3 and Sr3Gd(BO3)3 single crystals by
micro-pulling-down method and analysis of luminescence properties

J. Pejchal 1; Y. Fujimoto 2; V, Chani 2; T. Yanagida 2,3; Y. Yokota 2; A. Yoshikawa 2,3; M. Nikl 1; A.

R. Simura 1; T. Yagi 1; K. Sugiyama 1; T. Yanagida 2; A. Yoshikawa 1,2
1. Tohoku Univ, Inst Mat Res KINKEN, Sendai, Miyagi 980, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi 980, Japan

Beitlerova 1
1. AS CR, Inst Phys, Prague 16253, Czech Republic
2. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

Abstract:
To develop new and efficient neutron scintillator, Ti-doped LiAlO2 single crystal was grown by
micro-pulling-down method. The X-ray excited radioluminescence spectra and neutron light yield were
measured. Positive effect of Mg codoping on the overall scintillation efficiency was found. The BaLu2F8
single crystal was grown by micro-pulling-down method using low temperature gradient at growthinterface and applying quenching immediately after growth process. (C) 2011 Elsevier B.V. All rights
reserved.

E-mail Address:
pejchal@fzu.cz

Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024811009857

Abstract:
Ce-doped double borates Ba3Gd(BO3)(3) and Sr3Gd(BO3)(3) (Ce:BGB and Ce:SGB, respectively) weregrown by the micro-pulling-down method, and the luminescence properties of the crystals were
investigated and compared with those of Ce-doped H-Ba3Y(BO3)(3)(Ce:H-BYB) crystals grown by thesame method. Transmittance measurements showed the wavelength of absorption band was around 380
nm for all the samples. Emission bands corresponding to the 5d -> 4f transition of Ce3+ were observed ataround 425 nm for Ce:BGB and Ce:SGB and at 435 nm for Ce:H-BYB. The photoluminescence decay
times of Ce:BGB, Ce:SGB, and Ce:BYB were 29.5 ns, 35.2 ns, and 26.8 ns, respectively. The emission
spectra obtained by excitation of Am-241 (an alpha-emitter) revealed that the host luminescence wasdominant (at around 315 nm) in BGB and SGB and that a very low-intensity Ce3+ 5d -> 4f luminescencepeak appeared at around 430 nm. The relative light yield strength observed under Am-241 excitation wascorresponding to <100 and similar to 270 photons/neutron for Ce:BGB and Ce:SGB, respectively, andthese values were lower than that of Ce:H-BYB (similar to 400 photons/neutron). (c) 2011 Elsevier B.V.
All rights reserved.

E-mail Address:
ray@imr.tohoku.ac.jp
Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024811010657

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JOURNAL OF CRYSTAL GROWTH Volume: 362 Pages: 157-161 Published: JAN 1 2013

JOURNAL OF CRYSTAL GROWTH Volume: 362 Pages: 167-169 Published: JAN 1 2013

Crystal growth and luminescence properties of Cr-doped YAlO3 single crystals

Micro-pulling down method-grown Er3+:LiCaAlF6 as prospective vacuum
ultraviolet laser material

M. Sugiyama 1; T. Yanagida 2; D. Totsuka 1,3; Y. Yokota 1; Y. Futami 1; Y. Fujimoto 1; A. Yoshikawa
1,2

M. Cadatal-Raduban 1; T. Shimizu 1; K. Yamanoi 1; K. Takeda 1; MH. Pham 1; T. Nakazato 1; N.
1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
3. Nihon Kessho Kogaku CO LTD, Gunma 3740047, Japan

Sarukura 1; N. Kawaguchi 2,3; K. Fukuda 2,3; T. Suyama 2; T. Yanagida 3; Y. Yokota 3; A. Yoshikawa 3
1. Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan
2. Tokuyama Corp, Shibuya Ku, Tokyo 1508383, Japan
3. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan

Abstract:
We have investigated optical and scintillation properties of Cr-doped YAlO3 (Cr:YAP) single crystals

Abstract:with different Cr concentrations. Cr:YAP crystals were grown by the micro-pulling-down (mu-PD)

We report the successful growth of trivalent erbium-doped lithium calcium aluminum fluoride

method. The grown crystals had a single-phase confirmed by the powder XRD analysis. For all the(Er3+:LiCaAlF6) using the micro-pulling down method. Several absorption bands were observed at 139

Cr-doped samples, a peak positioned near 700 nm wavelength dominates the spectra. It can be ascribed to

nm (71,942 cm(-1)), 149 nm (67,114 cm(-1)), and 162 nm (61,728 cm(-1)), which can be ascribed to 4f ->the Cr3+ E-2 ->(4)A(2) emission. In X-ray induced radioluminescence spectra, E-2 ->(4)A(2) emissions

5d transitions in Er3+ Evaluation of its optical properties using the 157-nm emission of a F-2 laser reveal

were observed. The light output of Cr 0.5%:YAP under X-ray excitation was more than twice as high asthat it has a 163-nm vacuum ultraviolet fluorescence with 1.3-mu s decay time, involving a transition

the standard CdWO4. (c) 2011 Elsevier B.V. All rights reserved.

originating from the high-spin state of the 4f (10)5d excited state configuration. This is one of the shortest
emission wavelengths from solid-state materials reported at room temperature. (C) 2011 Elsevier B.V. All

E-mail Address:

rights reserved.

makoto.sugiyama@imr.tohoku.ac.jp
Site Address:

E-mail Address:

http://www.sciencedirect.com/science/article/pii/S0022024811009365

cadatal-m@ile.osaka-u.ac.jp
Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024811008803

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JOURNAL OF CRYSTAL GROWTH Volume: 362 Pages: 178-181 Published: JAN 1 2013

JOURNAL OF CRYSTAL GROWTH Volume: 362 Pages: 243-246 Published: JAN 1 2013

Growth and scintillation properties of Nd-doped Lu3Al5O12 single crystals by
Czochralski and micro-pulling-down methods

The control of mean ionic radius at Y site by Lu co-doping for Ce:LiYF4 single
crystals

M. Sugiyama 1; Y. Fujimoto 1; T. Yanagida 2; A. Yamaji 1; Y. Yokota 1; A. Yoshikawa 1,2

Y. Yokota 1; A. Yamaji 1; T. Yanagida 1; N. Kawaguchi 1,3; K. Fukuda 1,3; A. Yoshikawa 1,2

1. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan

1. Tohoku Univ, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan
2. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
3. Tokuyama Corp, Yamaguchi 7458648, Japan

Abstract:
The Nd-doped Lu3Al5O12 (Nd:LuAG) single crystal was grown by the Czochralski (CZ) method. In

Abstract:

XRC profiles, the full-width at half-maximum (FWHM) value was 58 arcsec, which was much higher

Lu co-doped Ce:LiYF4 single crystals with Lu 0, 25, 50, 75 and 100 at% concentrations were grown forthan that of the mu-PD (194 arcsec). In photo and radio-luminescence spectra, the CZ grown sample

the control of mean ionic radius at Y site and the effects on crystal growth, structural phase, crystallinity

showed strong emission peaks attributed to Nd3+ 4f-4f transitions in visible wavelengths longer than 400

and segregation were investigated. Lu co-doped Ce 2 at%:LiYF4 single crystals with Lu 0, 25, 50, 75 andnm. The Nd:LuAG grown with the CZ method showed light yield of 7900 photons/MeV, which is

100 at% concentrations were grown by the micro-pulling-down method and while the initial part ofcomparable with the standard EGO and energy resolution of 14% under Cs-137 gamma-ray excitation.

Ce:LiYF4 single crystal indicated opaque and milky due to the increase of mean ionic radius at Y site by(C) 2011 Elsevier B.V. All rights reserved.

Ce3+ doping, Lu co-doped crystals had transparency in all part of crystals. All Lu co-doped crystals
indicated a single phase in XRD measurements and the lattice parameters were systematically decreased

E-mail Address:

with an increase in Lu concentration. Crystallinity of grown crystals became worse by Lu co-doping andmakoto.sugiyama@imr.tohoku.ac.jp

the effective segregation coefficients of Ce3+ ion for Lu co-doped crystals were almost the same,

Site Address:

0.15-0.19. (C) 2011 Elsevier B.V. All rights reserved.

http://www.sciencedirect.com/science/article/pii/S0022024811008736

E-mail Address:
yokota@imr.tohoku.ac.jp
Site Address:
http://www.sciencedirect.com/science/article/pii/S002202481100933X

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JOURNAL OF CRYSTAL GROWTH Volume: 362 Pages: 288-290 Published: JAN 1 2013

JOURNAL OF CRYSTAL GROWTH Volume: 362 Pages: 296-299 Published: JAN 1 2013

Pr or Ce-doped, fast-response and low-afterglow cross-section-enhanced
scintillator with Li-6 for down-scattered neutron originated from laser fusion

Valence state of dopant and scintillation properties of Ce-doped Sr3Y(BO3)3 crystal
R. Simura 2; S. Kawai 2; K. Sugiyama 2; T. Yanagida 1; T. Sugawara 2; T. Shishido 2; A. Yoshikawa 1,2
1. Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi 980, Japan
2. Tohoku Univ, Inst Mat Res KINKEN, Sendai, Miyagi 980, JapanK. Watanabe 1; Y. Arikawa 1; K. Yamanoi 1; M. Cadatal-Raduban 1; T. Nagai 1; M. Kouno 1; K. Sakai
1; T. Nazakato 1; T. Shimizu 1; N. Sarukura 1; M. Nakai 1; T. Norimatsu 1; H. Azechi 1; A. Yoshikawa

2; T. Murata 3; S. Fujino 4; H. Yoshida 5; N. Izumi 6; N. Satoh 7; H. Kan 7
1. Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan
2. Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
3. Kumamoto Univ, Kumamoto 8608555, Japan
4. Kyushu Univ, Kishi Ku, Fukuoka 8190395, Japan
5. Ceram Res Ctr Nagasaki, Nagasaki 8593726, Japan
6. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
7. Hamamatsu Photon Kk, Kita Ku, Hamamatsu, Shizuoka 4312103, Japan

Abstract:
We explore the potential of Pr- or Ce-doped 20Al(PO3)(3)-80LiF (APLF80+3Pr or +3Ce) scintillator toobserve the lower edge of down-scattered neutron and discriminate fusion originated neutron from strong
X-ray signals. APLF80+3Pr or +3Ce scintillator exhibits considerably fast decay profiles and negligibleslow-decay components. Using these newly developed APLF80+3Pr or +3Ce scintillators, we havesuccessfully observed fusion-originated neutron signal in the midst of strong X-ray-excited fluorescencein an integrated experiment using our 10 kJ class GEKKO XII Nd-glass laser system. A sophisticatedneutron detection system using APLF80+3Pr or 3Ce will be used for the first fast ignition experiment. (C)2011 Elsevier BY. All rights reserved.

Abstract:
A transparent Ce:SYB crystal was grown by employing the floating zone method in a dry-air atmosphere,
and the growth rate was 1 mm/h. The feed/seed rods were formed by sintering raw powder at 1000
degrees C for 24 h. The Ce content in the grown crystal was measured by electron probe microanalysis
and was found to be very low (approximately 0.1 at%). Ce LIII XANES measurement showed that 90%of the Ce in the sintered powder was quadrivalent. On the other hand, approximately 80% of the Ce in thegrown crystal was trivalent. Emission bands centered at 415 nm corresponding to the 5d-4f transition of
Ce3+ were observed when the excitation wavelength was 365 nm. The decay time under this condition
was approximately 12.26 +/- 0.45 ns. The light yield strength excited by an a-source was approximately
similar to 6% of that from the Li-glass. (C) 2011 Elsevier BY. All rights reserved.

E-mail Address:
ray@imr.tohoku.ac.jp
Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024811010682

E-mail Address:
watanabe-k@ile.osaka-u.ac.jp
Site Address:
http://www.sciencedirect.com/science/article/pii/S0022024811010712

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The 7th International Workshop on Individual Monitoring of Ionizing Radiation
APPLIED PHYSICS LETTERS Volume: 102 Pages: 051907 Published: Feb 5 2013



Submicron-diameter phase-separated scintillator fibers for high-resolution X-ray
imaging

Y. Ohashi, N. Yasui, Y. Yokota, A. Yoshikawa, and T. Den 1,2


1. Canon Inc., Frontier Research Center, Ohta-ku, Tokyo 1468501, Japan
2. Tohoku Univ., Institute for Materials Research, Sendai, Miyagi 9808577, Japan


Abstract:
We demonstrated micrometer-scale resolution X-ray imaging by using phase-separated scintillator fibers.
Hexagonally well-aligned 680-nm-diameter GdAlO3(GAP):Ce3t scintillator fibers surrounded with

a-Al2O3 were fabricated from directionally solidified eutectics. The GAP:Ce3t fibers convert X-rays to

lights and emitted lights are confined and transported along the fiber direction by a total reflection mode.
High-resolution X-ray image of a gold grating phantom with a 4 lm aperture, corresponding to a bundleof 12 fibers, was achieved even with a 150 -lm-thick scintillator. These scintillator fibers overcome
resolution reduction caused by light scattering and almost reach the resolution limit of the material nature
itself.VC 2013 American Institute of Physics.

E-mail Address:
den.toru@canon.co.jp.
Site Address:
http://apl.aip.org/resource/1/applab/v102/i5/p051907_s1

130            

  
  

            



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The 7th International Workshop on Individual Monitoring of Ionizing Radiation

The 7th International Workshop on Individual Monitoring of Ionizing Radiation

 




Yutaka Fujimotoa, Takayuki Yanagidab, Shunsuke Kurosawaa, Akira Yoshikawaa, b   



 

 


There is an increasing amount of interest in amorphous materials for optical devise and radiation
              
               
    +  

detector applications, e.g., phosphors, active laser medium, photochromatic lens for sun protection,τ Γ τ λ      
              |ϕ>            

         λ3.   
         
      
     
           
      
             
             
            
 τ     λ2.4.                     


                   


and at present, intense studies are carried out to find an alternative detector for 3He gas counter because

Γ=

∝


λ 

 ∑ <    >  amplifier device, dosimeter, and scintillator. Fluoride, phosphate, and silicate glasses with high UVtransmission and doped with active luminescence center ions were much investigated. Especially, lithium
silicate glasses activated with Ce3+ are known to be scintillation material for thermal neutron detection [1],3

He gas resources became strictly limited as a result of excessive demand for security applications [2].

Thus despite the performance of 6Liloaded glass scintillator has been studied for a long time, number ofreport about 10B based glasses scintillator for thermal neutron detection are small. Borate glass scintillator
are expected to have high thermal neutron detection efficiency because 10B have a high cross section tothermal neutrons than 6Li, and when neutron is captured by 10B, it releases high energy secondary charged
particles based on 10B(n, α)7Li reactions [3]. Previously the only related reports were L2OB2O3 andAl2O3Na2OB2O3SiO2 based glass activated with Cu+ and rareearth ions [46]. In this work, wedeveloped sodium tetraborate glass scintillators doped with several luminescence center ions except
rareearth ions, such as the ions with s2 (Pb2+, Bi3+) and d0 (Ti4+, V5+, W6+) configurations because theyyield intense emission bands in bluegreen wavelength range in other glass host [7]. The luminescence
properties and radiation response of the glasses were studied by the measurements of photo andradioluminescence spectra, and 241Am irradiated pulse height spectra.
Reference[1] R.J. Ginther and J.H. Schulman. IRE Trans. Nucl. Sci., NS5 (1958) 9295..
[2] R.T.Kouzes, in: The 3He supply problem, Technical Rpt. PNNL18388, Pacific Northwest National
Laboratory, Richland, WA, 2009.
[3] C. W. E. van Eijk, Radiat. Meas. 38 (2004) 337–342.
[4] M. Ishii and et al, Nucl. Instrum. MethA 537 (2005) 282285.
[5] B. I. Zadneprovski, N. V. Eremin, A. A. Paskhalov, Func. Mate. 12 (2005) 261268.
[6] L. M. Bollinger and G. E. Thomas, Nucl. Instr. Meth. 17 (1962) 97116.
[7] G. Blasse and B.C. Grabmaier, “Luminescencent Materials” SpringerVerlag, Berlin, Heidelberg(1994).

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The 7th International Workshop on Individual Monitoring of Ionizing Radiation

The 7th International Workshop on Individual Monitoring of Ionizing Radiation





      



∼

              

                

              

 



                         

          





                



           



    





 




 


              
 


(a)

(a)

(b)
(c)

(b)

(c)

(d)

 











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

 




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The 7th International Workshop on Individual Monitoring of Ionizing Radiation

Evaluation of Nd:BaY2F8 for VUV scintillator
Shunsuke Kurosawa1,*, Takayuki Yanagida2, Jan Pejchal1.3, , Kentaro Fukuda4,
Noriaki Kawaguchi4, Sumito Ishizu4, Toshihisa Suyama4, Masanori Nakagawa4,

Yuui Yokota1, Martin NIkl3, Akira Yoshikawa1,21Institute for Materials Research, Tohoku University

2

New Industry Creation Hatchery Center (NICHe), Tohoku University
3

Institute of Physics, Academy of Sciences of the Czech Republic
4Tokuyama cooperation

Vacuum Ultra violet (VUV) scintillator, generally, has short decay time of a few to 10 ns, and thisscintillator can be used for high rate counting. However, few VUV scintillators were reported. Here,BaY2F8 doped with Nd (0.1, 0.5, 1, 3, 10, 20 mol%) single crystals were successfully grown by amicro-pulling down (µ-PD) method as a new VUV scintillator [1, 2]. Then we investigated the opticaland scintillation properties. Figure 1 shows a decay curve of BaY2F8 doped with 10-mol% Nd(excitation and emission wavelength were 160, and 180 nm, respectively) at 300 K using the DESY
synchrotron beam. The sample had 13.3 nsec (99 %) and 30 nsec (1 %). Although this scintillator has low
light output by our pulse height measurement, we found this crystal had a typical decay time in the VUVscintillators.

The 7th International Workshop on Individual Monitoring of Ionizing Radiation aAkihiro Yamaji, bTakayuki Yanagida, aYuui Yokota, cNoriaki Kawaguchi,aAkira Yoshikawa




One of the candidates of the next generation computed tomography (CT) detectors are considered to use
the novel scintillation detectors consisting of VUV scintillator and gas photodetector (gas PMT) [1]. The
gas PMT employs photosensitive gases (such as TMAE or TEA) or photocathodes (such as CsI) which
are mainly sensitive to VUV photons. Therefore, the development of efficient VUV scintillator is required
and we reported that the crystal growth and scintillation properties of Tm doped K2NaLuF6. In that report,
Tm doped K2NaLuF6 showed good scintillation properties as a candidate VUV scintillator [2]. To bringforward this research, the largesize single crystal is required to develop imaging detectors. Therefore, inthis study, undoped and Tmdoped K2NaLuF6 single crystals were grown by the Czochralski method andthe scintillation properties were investigated.
The nominal chemical composition of K2.1Na0.9Lu1.0x TmxF6 (x = 0.1) for the crystal growth was
optimum condition and it was grown by a vacuumtight Czochralski system equipped with radio
frequency induction heater. The crucible and heater which were made of highdensity carbon graphite
and the heat insulator which was made of porus graphite were used. The crystal growth rate was 0.71.0
mm / h and the rotation rate was 10 rpm.
The grown crystals were about half inch in diameter and have some cracks and milky parts, as shown
Fig. 1. The phase characterizations of grown crystals were confirmed by powderXRD and with EDS
analysis. The crystal had the emission peak at around 188 nm under Xray excitation and this emission
was ascribed to Tm3+ ion 5d4f transition. The light yield was also evaluated to 680 photon / 5.5 MeV
αray and this was one of the brightest VUV scintillators so far. In the conference, optical properties aswell as the scintillation characteristics will be presented.

Fig. 1. Photograph and crosssection of Tm 10% doped K2NaLuF6 crystal.

Figure 1 decay curve of BaY2F8 doped with 10-mol% Nd.
References

Reference
1. H. Sekiya, C. Ida, H. Kubo, S. Kurosawa, K. Miuchi, T. Tanimori, K. Taniue, A. Yoshikawa,, T.
Yanagida, Y. Yokota, K. Fukuda, S. Ishizu, N. Kawaguchi, T. Suyama, Nucl. Instrum. Methods A
 S36 (2011).
2. N. Abe, Y. Yokota, T. Yanagida, N. Kawaguchi, J. Pejchal, M. Nikl, K. Fukuda, A. Yoshikawa,IEEE. Trans. Nucl. Sci. , NO. 3, 12781281, 2010

[1] A. Yoshikawa et al., J. Cryst. Growth 270, (2004), 427.
[2] A. Yoshikawa, M. Nikl, G. Boulon, T. Fukuda, Opt. Mater. 30, (2007), 6.

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The 7th International Workshop on Individual Monitoring of Ionizing Radiation



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










 
              
                            

           ＜   




                 


                              



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

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


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

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



        

    

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


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               


               

 

α                
 γ
           

                

           


 

             
              

 

               
           

 

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139

The 7th International Workshop on Individual Monitoring of Ionizing Radiation

The 7th International Workshop on Individual Monitoring of Ionizing Radiation

Optical and Scintillation Properties of Nd doped YAlO3
with different concentrations  


Daisuke Totsuka1, Takayuki Yanagida2, MakotoSugiyama1, Yutaka Fujimoto1, Yuui Yokota1
and Akira Yoshikawa1,2
1

IMR, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
NICHe, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan.

2


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Inorganic scintillators play a major role in radiation detection in many sectors of fundamental and              
            
             


 

               
 

 

applied research, in almost all medical diagnostic imaging modalities and in many industrial measuring→ → → → →   →    
systems. In these applications, Ce3+-doped scintillators are widely recognized as the promising materials
due to their advantages such as fast decay time of several tens of nanoseconds and high light yield, e.g.
Lu2SiO5 (LSO), (Lu,Y)2SiO5 (LYSO) and YAlO3 (YAP). On the other hand, slow 4f-4f transitions havebeen playing an important role in X-ray detectors such as computed tomography (XCT) and security
inspection system, because they show a low afterglow, high light yield and suitable emission wavelength
to Si-photodiode (PD). The Si-PD has high quantum efficiency from 400 to 1100 nm where a lot of lines
originated from the 4f-4f transitions of lanthanide elements are observed. In recent years, Nd3+ has been
proposed to use as a scintillation activator. The 4f-4f transitions show several emission peaks from UV to
IR wavelength range and s order decay time. It has been reported that Nd doped scintillators exhibited
light yield of 7500 photons/MeV with decay time of 5.0 s in Lu3Al5O12 (LuAG) host and light yield of
11000 photons/MeV with decay time of 2.5 s and Y3Al5O12 (YAG) transparent ceramics host .
Figure 1 represents pulse height spectra when YAP:Nd single crystals were coupled with the Si-APD  

(S8664-55) which has a wide sensitivity range from UV to NIR wavelength. The Nphe/MeV were

estimated using 137Cs 662 keV photo-absorption peak, compared with the direct irradiation to Si from

55

Fe 5.9 keV X-ray which creates 1639 electron–hole pairs. The results are represented in figure 2.

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                      
        

      

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140

Figure 1. 137Cs gamma-ray irradiated pulse heightspectra of pure (black), Nd 0.01 (red), 0.05 (blue)and 0.1 (pink) and 0.5 (green) mol% doped YAP
single crystals compared with the X-ray direct
irradiation to Si-APD photodetector from 55Fe 5.9
keV (black).

Figure 2. Photoelectron yields of Nd:YAPs
against Nd concentration.

141

The 7th International Workshop on Individual Monitoring of Ionizing Radiation

The 7th International Workshop on Individual Monitoring of Ionizing Radiation






Makoto Sugiyamaa, *, Takayuki Yanagidab, Yuui Yokotaa, Yutaka Fujimotoa, and Akira
Yoshikawaa, b








 







                 


              






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Cedoped scintillators have been developed in past two decades because Ce3+ exhibits highly efficientand fast 5d4f luminescence. On the other hand, recent studies have shown that Prdoped materials also
exhibit 5d4f transitions and can be alternative to Ce3+ doped scintillators. The parity and spin allowed
5d4f transitions of Pr3+ receive attention from the aspect of the decay time which is generally faster thanthat of Ce3+. Recently, our group examined scintillation properties of Cedoped LuLiF4 scintillator and thematerial exhibited the light yield of 3600 photons/MeV under gammaray irradiation. Instead of Ce3+,
Pr3+ ions were doped in the LuLiF4 host lattice in this study and scintillation properties of the material
were investigated. This is the first time to investigate scintillation responses of Pr:LuLiF4.
The Prdoped LuLiF4 single crystal was grown with the vacuum tight micropullingdown (PD)
method. The grown crystal was cut perpendicular to the growth axis and polished for the evaluation of the
optical and scintillation properties.
The grown single crystal was transparent and about 80% transparency was achieved at UV to visible
wavelengths and some absorption bands due to Pr3+ 5d4f and 4f4f transition were observed. Fig. 1
demonstrated the radioluminescence spectrum of the Prdoped LuLiF4 single crystal. Emission peaks due
to Pr3+ 5d4f transitions at approximately 210270 nm were detected. Emission lines at wavelengths
longer than 430 nm are attributed to 4f4f transitions of Pr3+. In the workshop, other properties such asγray induced light yield and decay time will be discussed.


 




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λ





λ







142



Fig. 1 241Am αray excited radioluminescence spectrum of the Prdoped LuLiF4 single crystal.

143

The 7th International Workshop on Individual Monitoring of Ionizing Radiation

Evaluation of the scintillation properties of Yb3+ ion doped Lu2O3
ceramics
S.WakaharaA, T.YanagidaB, Y.FujimotoA, M.SugiyamaA, Y.YokotaA, A.IkesueC,
A.YoshikawaA,B
A
Institute for Materials Research, Tohoku University
B
New Industry Creation Hatchery Center (NICHe), Tohoku University
C
World Labo. Co. Ltd.
The applications of scintillator require luminescentmaterials that can absorb high-energy photons or particles
and convert them to luminescence. Therefore, single
crystals are suited and generally used, however there aresome merits of using transparent ceramics as scintillator
instead of single crystals, for example they have betterchemical uniformity and can be produced with higher
amount of the dopant comparing to corresponding single
crystals.
Lu2O3 ceramics are high density and have higheffective atomic number, i.e., γ-ray stopping power isfine. Furthermore, Yb3+ charge transfer transition iswell known as fast and intense emission. Therefore,
we have estimated the optical and scintillation

TV, Journals and Newspaper Items

properties of pure and Yb3+ doped Lu2O3 transparent
ceramics.
Pure and Yb3+ doped Lu2O3 ceramics samples weremade by sintering method in World Labo.Co. Ltd..
The characteristic of the method is synthesizing the
precursor by solid state reaction. Sintered samples were cut and polished to the physical dimensionsof 5.0×5.0×1.0 mm3. The transmittance spectra of the samples were measured as the optical property.
Radio luminescence spectra were measured using 5.5MeV α-ray (241Am) as the excitation source.
The decay time of Yb3+ doped one was measured using streaks camera. The light yield of Yb3+
doped one was also measured under 5.5MeV α-ray excitation.
The appearance of the samples is shown in Fig. 1. Both of the samples were visibly transparent andthey had neither cracks nor inclusions. Fig.2 shows the decay curve of the Yb3+ doped Lu2O3. The
decay time profile was well reproduced by single exponential function, and the decay time found forthe sample was 1.1 ns.

144

145

List of Events151

2012 年度（平成 24 年度）吉川研究室行事
月

吉川研究室

4

学会
4/23-26 Solid State Chemistry(Russia)

研究会・講演会
4/17-18 大阪大学レーザー研シンポジウム
4/23-265

5/12-17 SORMA-WEST2012(Oakland)

6

6/6-7

7

7/1-6 EXCON2012(Russia)
7/9-13 ISAF ECAPD 2012(Portugal)

5/30 学振１８６委員会(東京)5/17-18 学振１６１委員会(宮崎)ICOOPMA2012(奈良)892012（大阪）
FMA29（京都）7/13-14 学振１６１委員会(京都)8/31 学振１８６委員会(東京)8/20-21 3rd International symposium (蔵王)9/18-14
LUMDETR2012(HALE,GERMANY)
9/11-14 日本物理学会 2012（京都）9/19-21 セラミックス協会第 25 回秋季シンポ
ジウム（名古屋）
9/21 学振１６１委員会(名古屋)

9/27 大洗研究会（大洗）10

10/13-18 DSEC4 (Washington)
10/19 学振１８６委員会(京都)10/29-11/4 IEEE NSS/MIC 2012(Anaheim)

11

11/7-10 日本希土類学会（沖縄）11/8-10 結晶成長国内会議（九州）

12 12/21 忘年会

12/1-3 放射線ﾓﾆﾀﾘﾝｸﾞﾜｰｸｼｮｯﾌﾟ（大洗） 12/7 第 7 回日本フラックス成長研究発表会（つくば）12/7 AMF-8（Pattaya,Thailand）
12/7-8 第 23 回光物性研究会（大阪）
12/20 学振１８６委員会(名古屋)1

1/15-16 学振１６１委員会(山口）22/4-7 研究会「放射線検出器とその応用」(つEvents and Memorieas

くば)
3 3/7-8 研究室シンポジ 3/27-30 応用物理学関連講演会(東京)
ウム＆スキ ー旅行 3/17-19 日本セラミクス協会 2013 年会
(蔵王)
(東京)

152

3/1-2 学振１８６委員会(仙台)153Welcome to Yoshikawa
Lab.!!, April , 2012

Hanami (Cherry-blossom viewing)
Mikamine park, April 21, 2012154

Summer Trip, Zao, August20, 2012

Wedding Parties,
21 Jul, 05 Aug, 07 Oct, 2012155

Sports events, October 22 andNovember 13, 2012

IEEE/ NSS2012, The U.S.,
27 Oct.– 03 Nov., 2012

156

Imoni Party, Hirose river, November

19, 2012

Year-End Party,
Tenkainorobata., Dec. 21, 2012157

吉川研究室 研究報告書

2012 Research Reports of
the Yoshikawa Laboratory〒980-8577
宮城県仙台市青葉区片平 2-1-1
東北大学 金属材料研究所
先端結晶工学研究部 吉川研究室〒980-8579
宮城県仙台市青葉区荒巻字青葉 6-6-10
未来科学技術共同研究センター（NICHe）

兼任

Yoshikawa Laboratory
Research Laboratory on Advanced Crystal Engineering,
Institute for Materials Research (IMR), Tohoku University
2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, JAPANNew Industry Creation Hatchery Center (NICHe)
6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, JAPANANNUAL REPORT 2011
Published on
発行日February 10, 20122012 年 2 月 10 日

Publisher
発行者

Akira Yoshikawa
吉川 彰

Editors

Akira Yoshikawa, Yoshisuke Futami
Yoshikawa Laboratory
Research Laboratory on Advanced Crystal Engineering,
Institute for Materials Research (IMR),
Tohoku University

編集者

New Industry Creation Hatchery Center (NICHe),
Tohoku University
吉川 彰、二見 能資
東北大学 金属材料研究所
先端結晶工学研究部 吉川研究室

Printed by
印刷所

Yoshikawa Laboratory
吉川研究室

Yoshikawa Lab.
Research Report
Published on February 10, 2013

ANNUAL REPORT 2012
編集・発行
東北大学 金属材料研究所
吉川研究室
吉川 彰 ・ 二見 能資
Edited and published by
A. Yoshikawa
Yoshikawa Laboratory
Institute for Materials Research,
Tohoku University