English Abstract－ 131 －

2S01 Bistable metal complexes
OSHIO, H(Univ. of Tsukuba)

Nippon Univ. 6CNIC)

5

Molecules may have flexible structures with easily controlled
electronic states. When molecules have several stable electronic
states (or phases) and their structures are flexible upon statechanges, such molecular systems can be promising candidates formolecular switching devises.
Spin crossover (SCO) and mixed valence (MV) complexes restin two spin states and two valence states, respectively.
Multi-component molecules, in which each component possesses
several states due to spin conversion and electron transfer, areexpected to show synergistic behaviors with stepped and/or
selective state conversions. In this lecture, multi-component
systems showing selective spin state conversion, photo-induced
SCM, and lability controlled cluster systheses will be presented.

2S02 Migration of radionuclides emitted from Fukushima
Dai-ichi Nuclear Power Plant based on speciation and isotopic
information
TAKAHASHI, Y.
(The University of Tokyo)
Speciation and isotope ratio of radionuclides contribute greatly
to the better understanding of environmental behaviors ofradionuclides emitted from Fukushima Dai-ichi Nuclear Power
Plant (FDNPP) accident in radiochemistry field. To reach this goal,
development of hyper-sensitive speciation and isotopic ratio
measurements for appropriate methods introduced from otherfields is important, which can be coupled with conventional
radioactivity measurement specific to this field. As examples ofthis strategy, development of X-ray absorption fine structure(XAFS) spectroscopy such as a hyper-sensitive XAFS method
using wavelength detection mode with crystal analyzer anddistribution analysis of functional groups in submicron scale using
scanning transmission X-ray microscopy (STXM) will be given. In
addition, systematic comparison of the results on radionuclides(e.g., cesium) with other elements enables us to predict elementwith little information on its environment behavior such as radium.
As for the isotopic analysis, direct measurement of the isotopes insolid samples is very important (e.g., SIMS and La-ICPMS), if theavailable amount of the samples is very limited such asradiocesium-bearing particles (CsBP). The isotopic ratios of U andCs showed that they are exclusively emitted from the FDNPP.
Stable isotope fractionations of other elements such as Fe and Zn
may help understand formation processes of CsBP including
evaporation of these elements within FDNPP.

1A01 Observation of radiation situation in Iitate village
during six years after the Fukushima-1 NPP accident and thecurrent radiation level around living areas after
decontamination
IMANAKA, T.1, ENDO, S.2, SUGAI, M.3, ICHIKAWA, K.3,
HAYASHI, G.4, TOYODA, N.3, SAWAI, M.6, KAMISAWA, C.6,
SAKUMA, J.3, ISHIDA, K.3, ITOU, N.3, BABA, H.3, ITONAGA,
K.5, URAGAMI, K.5, OZAWA, S.3(1Kyoto Univ., 2Hiroshima Univ., 3IISORA, 4Tohuku Univ.,

Car-borne radiation monitoring over the main roads of the Iitate
village has been carried out periodically since the Fukushima-1
NPP accident in March 2011. Measured values inside the car wereconverted to those on the road. The average dose rate in the village
was 10.7 PSv/h at the time of the first monitoring on March 29,
2011, while it decreased to 0.60 PSv/h at the eighth monitoring on
April 1, 2017. A large scale decontamination work in Iitate village
began in 2014 and continued for three years. Last year, in order to
get the information on the current level of radiation and to prepare
the planned lifting of evacuation instruction, radiation surveys
around 249 houses (16 % of the total houses in village) werecarried out in four districts in cooperation with local residents. The
average levels of radiation were found to be about 0.5 – 1.0 PSv/h.
Assuming a house transmission factor of 0.4 and a stay model of
16-hr inside and 8-hr outside house, the annual radiation exposureof 3 – 5 mSv can be estimated when residents return to their homes.

1A02 Quantitative analysis of 36Cl in surface soils near the
Fukushima Dai-ichi Nuclear Power Plant using accelerator
mass spectrometry
OHTA, Y.1, SUEKI, K1, SASA, K.1, TAKAHASHI, T.1,
MATSUNAKA, T.2, MATSUMURA, M.1, TOSAKI, Y.3,
HOSOYA, S.1, TAKANO, K.1, OCHIAI, Y.1, SATOU, Y.4,
YOSHIKAWA, H.4, NAKAMA, S.4, MINOWA, H.5(1Univ. of Tsukuba, 2Kanazawa Univ., 3AIST, 4JAEA, 5Jikei Univ.
School of Medicine)
A large amount of radionuclides was released into theenvironment by the Fukushima Dai-ichi Nuclear Power Plant(FDNPP) accident. The emission of 36Cl was also suspected,
whereas only one report so far measured 36Cl in contaminated soil.
Therefore, we conducted additional measurements of 36Cl in soil
around the FDNPP. We collected surface 5 cm soil at 31 locations
around the FDNPP (distance from the FDNPP: 1.4-28.8 km) andextracted inorganic chlorine (Clinorg) from the soil by 0.01 M HNO3.
The 36Cl/Cl was determined by AMS at the University of Tsukuba,
Tandem Accelerator Complex. In 10 locations among the 31
locations (distance from the FDNPP: 7.6-28.8 km), the 36Cl/Cl
varied from 0.138 to 6.86 (×10-12) and 36Cl inventory varied from
0.132 to 3.96 mBq/m2. Some of the measured 36Cl/Cl were higher
than those before the accident. In these sampling points, theobserved 36Cl inventory were also larger than the estimated value
before the accident. These results are considered to be evidence ofthe 36Cl emission. However, the definite correlation was not foundbetween 36Cl and 129I or 137Cs. The sampling points with larger 36Cl
inventory were located at a distance of 7.56-8.12 km from the
FDNPP. Measurement results in another 21 locations including
those closer to the FDNPP will be shown in the presentation.

1A03 Radioactivity monitoring in the Tokyo Bay – temporalvariations of 134Cs and 137Cs in sea sediment and seawater –TOYOOKA, S.1, NITTA, W.1, KANEKO, K.1, KISHIMOTO, T.1,
ISOGAI, K.1,
(1 Japan Chemical Analysis Center)
After the accident of Fukushima Dai-ichi NPP, a large amount of－ 133 －

radioactive materials had been released into the environment anddistributed widely in the Kanto area. Atmospheric radioactive
materials deposited on the ground surface by rainfall, weretransported by natural phenomenon or anthropogenic action. And
finally flowed into the Tokyo Bay via the rivers, and deposited on
sediment.
Radioactivity monitoring of 134Cs and 137Cs at 23 points in theTokyo Bay has been carried out since 2013 to estimate theinfluence of Fukushima Dai-ichi NPP accident. In recent four years,
activity concentrations has been decreased at most points. As for,point “K-T1” and “C-P8” which are located off Arakawa River andKyu-Edogawa River, and near Kisarazu Port, activity
concentrations maintained relatively high during this monitoring.
Activity concentrations of “K-T1” and “M-C1” which arelocated off Arakawa River and Kyu-Edogawa River, showed adifferent secular variation in spite of the same river mouth.
Although “K-T1” is farther than “M-C1” from the river mouth,
radioactivity concentrations in “K-T1” is higher than that in“M-C1”.
Radioactivity ratios of 134Cs/137Cs show that the source term ofradio cesium in sediment and seawater samples had been derived
from the accident of Fukushima Dai-ichi NPP.

1A04 Existence forms and distribution characteristics ofradiocesium in coastal marine sediments off Fukushima
Prefecture
TERASAKI, S.1, NAGAO, S.1,ODANO, N.2,ASAMI, M.2(1LLRL, Kanazawa Univ., 2National Maritime Research Institute)Radiocesium was released into marine environment because of
the accident of Fukushima Dai-ichi Nuclear Power Plant (FDNPP).
A part of radiocesium was adsorbed to the bottom sediments andtheir radiocesium concentration varied spatially and temporally.
This study investigates the distribution characteristics of 137Cs andthe existence forms by using selective extraction experiments.
Sediment samples were collected in the coastal area off Fukushima
and Miyagi Prefectures in 2014 and 2015. Gamma rays of 134Cs(605 and 796 keV) and 137Cs (662 keV) were measured for the
samples. Artificial seawater dissolution experiment and selective
extraction experiments (1M ammounium acetate and 10%hydrogen peroxide) were carried out for the sediment samples.
Water content is related to the variations of radiocesium
concentration. Dissolution rate of 137Cs by artificial seawater
ranges from 0.047 to 0.16% for the sediments off the Abukuma
River and from 0.38 to 14% for those off the Niida River and
FDNPP. The results indicate that most of radiocesium is adsorbed
to clay minerals in the sediments and the variation of 137Cs iscontrolled by the movement of sediment particles.

1A05 Research for the distribution of radiocesium-bearing
particles in dust from near the Fukushima Daiichi Nuclear
Power Plant
MINOWA, H.1, YOSHIKAWA, H.2, NAKAMA, S.2, SATOU, Y.2,
SUEKI, K..3
(1Jikei Univ., 2JAEA, 3Univ. of Tsukuba)
Radiocesium-bearing particles in dust samples from 27
location were investigated from January 2014 to November 2016,

at Futaba-machi and Okuma-machi within about 8 km from
Fukushima Daiichi Nuclear Power Plant. Dust samples werecollected by an adhesive sheet or a smear filter paper from thesmooth surface within 10 × 10 cm in the place where the air fromthe outdoor enters and not exposed to rain, such as a garage, a
storehouse or under the ventilation fan in the kitchen.
Radiocesium-bearing particles were picked up from the dust
collected with a spatula or a brush. Particulate spots were observedin the image of autoradiography for the adhesive sheets. The size
and the concentration (indicator of the radioactivity) and thenumber of the particulate spots were greatly different depending on
the sampling place. The smear filter samples were measured by the
Ȗ-ray spectrometry with a Ge-detector. Based on the quantitative
134Cs and 137Cs values, the 134Cs/137Cs ratios at March 2011 were
calculated, and the origin reactor and its mixing ratios were
estimated. The particles were analyzed by SEM and their shapeobservation and chemical composition were determined. Based onthese data, the spatial distribution of radiocesium-bearing particles
and the origin of particles and their transportation/deposition
processes will be discussed.

1A06 Production
experimentsoftheinsoluble
Cs-concentrated particles including metal elements releasedby the FDNPP accident
FUJITA, N.1, NINOMIYA, K.1, SHINOHARA, A.1,
YOSHIMURA, T.2, KOGURE, T.3(1Gradutate School of Science, Osaka University, 2Radioisotope
Research Center, Osaka University, 3Graduate School of Science,
The University of Tokyo)
By the accident of Fukushima Daiichi Nuclear Power Plant(FDNPP), many amounts of radioactive nuclides were released
into the environment. Among them, the existence of
Cs-concentrated particles with a diameter of about 2 μm wasreported. The main component of the particle is SiO2, and it also
contains Cs, Fe, and Zn. The chemical property of the particle isglassy and insoluble in water and acid. In this study, we produced
the simulated particles by generating a splash of SiO2 in melting
CsOH in 300~500 Υ temperature condition. We also produced
particles containing Fe and Zn by putting galvanized iron piece inmelting CsOH. We observed the produced particles using
Scanning Electron Microscope (SEM), Energy Dispersive X-ray
Spectroscopy (EDS), and Transmission Electron Microscope(TEM). We found that the particles have the similar shape andinternal composition with the observed insoluble Cs-concentrated
particles.

1A07
Radioactive cesium-bearing particles in black
substances
KURIHARA, Y.1, MIURA, H.1, HIGAKI, S.2, SAKAGUCHI, A.3,
TANAKA, K.4, NAGAO, S.5, YAMAMOTO, M.6, TAKAHASHI,
Y.1(1The Univ. of Tokyo, 2RIC, The Univ. of Tokyo, 3Univ. of
Tsukuba, 4JAEA, 5LLRL, Kanazawa Univ., 6Kanazawa Univ.)
In order to obtain the comprehensive information on thecharacteristics of the radioactive Cs-bearing particles (RCsparticles) and their distribution in Fukushima contaminated areas,－ 134 －

the RCs particles in the black substances (highly contaminatedroad dust) were investigated. The activities of 134Cs and 137Cs in
the particles separated from the sample and identified by
SEM-EDS were measured by HPGe detector. Spherical particles
with diameters RIȝm or less were found in any sampling areas.
Particles of this type are similar in terms of chemical composition
to those reported so far, and were estimated to be derived from
Units 2 or 3 of FDNPP from the 134Cs/137Cs activity ratio. In thesamples of Futaba Town and Minamisoma City, particles withdiameters of several tens to several hundreds of microns were
found. Most of the particles in this region were not uniform inshape. The main components of the particles were Si, Ca, K, andAl, which were estimated to be derived from Unit 1 of FDNPP
from the 134Cs/137Cs activity ratio.From the results above, it wassuggested that large and small particles have different sources andgeneration processes. Additionally, it was suggested that theirgeneration processes are different even among small particles, due
to the difference in the composition and the relationship between
137Cs radioactivity and the volume.

1A08 Monthly flux of particulate 129I in river of Fukushimafrom 2013 to 2016
MATSUNAKA, T.1,2, SASA, K.1, TAKAHASHI, T.1, ONDA, Y.1,
TANIGUCHI, K.3, WAKIYAMA, Y.4, SUEKI, K.1(1Univ. of Tsukuba, 2Kanazawa Univ., 3Fukushima Pref. Gav.,
4
Fukushima Univ.)
This study investigated the fluxes of particulate 129I and 137Cs in
the downstream of Niida River system in Fukushima, where theupper watershed is in the relatively high-contaminated zone
located 30–40 km northwest from the Fukushima Daii-ichi
Nuclear Power Plant. Suspended substance (SS) in river water
were continuously collected at Haramachi site (5.5 km upstream
from the river mouth) of the downstream river by installing thetime-integrative SS sampler from Jan. 2013 to Jun. 2016. Monthly
activities of 129I and 137Cs in SS were 0.92–4.1 mBq kgí1 and
16–31 kBq kgí1 during the 2013. The 129I activity was strongly
correlated with the maximum turbidity in the river water withcorrelation coefficient (R2) of 0.90. Higher 129I activity found in
Mar. Apr., Sep., and Oct. 2013 were considered to infer the highcontribution of SS from higher contaminated upper watershed area.
Meanwhile, the fluxes of particulate 129I and 137Cs at Haramachisite were estimated to be 0.024–43 kBq monthí1 and 0.70–330
GBq monthí1 from 2013 to 2016. There is a possibility that
relatively massive amount of particulate 129I and 137Cs from the
upstream were transported to the downstream of the river andmarine environment by the rain events.

1A09 Transport behavior of particulate forms of radiocesium
observed at sediment trap experiments off the Fukuhsima
Dai-ichi Nuclear Power Plant
NAGAO, S.1, TERASAKI, S.1, ODANO, N.2, ASAMI, M.2(1KANAZAWA Univ., 2NMRI)
The sediment trap experiments were carried out at two sites of
the coastal area off the Fukushima Dai-ichi Nuclear Power Plant.
The total mass flux of settling particles and radiosecium
radioactivity were monitored at a 30 m water depth site in a periodof 6 October-6 November 2015 and 26 December 2015-26 January
2016, and at a 60 m water depth site during 6 October-6 November
2015. Higher total mass flux and radiosecium flux were observed
for the settling samples collected at both sites during stormy
weather condition (6-11 October 2015). The similar situation was
also observed during 20-26 January 2016. The settling particles
were sandy materials with average particle size of 33-133 μm. The
results indicate that sandy bottom sediments were re-suspended
and moved in the coastal area less than water depth of 60 m duringstormy weather condition.

1A10 The transport of radiocesium in sediments by flow ofriver at Tamagawa river watershed
AKIYAMA, M.1, OKUMURA, S.1, SHIMONO, A.2, OCHI, K.3,
HAGIWARA, K.2, KOIKE, Y.2(1 Grad. Sch. of Sci. and Tech., Meiji Univ., 2 Sch. of Sci. andTech., Meiji Univ., 3 JAEA)
Radionuclides including radiocesium (134Cs and 137Cs) was
spread out from the Fukushima Daiichi Nuclear Power Plant(FDNPP) after the accident. The behavior of FDNPP-derived
radiocesium in sediment were observed at 50 sampling points in
Tamagawa river watershed. The Tamagawa river watershed is anurban river flowing throughout the Tokyo Metropolis. The activity
concentrations of radiocesium in sediment at downstream werehigher than that at upstream. On the other hand, high concentrationof radiocesium in sediment was observed at upstream of Nogawa
river. The flow rate of Nogawa river is slower than that of
Tamagawa river watershed because Nogawa river is one of thetributary of Tamagawa river watershed. These results indicatedthat the transport process of radiocesium in sediment depend on thewater discharge and watershed environment.

1A11 The effect of radiocesium-bearing microparticles on thesolid-water distribution coefficient of radiocesium in rivers inFukushima*Hikaru Miura1, Yuichi Kurihara1, Aya Sakaguchi2, Seiya Nagao3,
Kazuya Tanaka4, Shogo Higaki1 and Yoshio Takahashi1(1Univ. of Tokyo, 2Univ. of Tsukuba, 3Univ. of Kanazawa, 4JAEA)
We focused on the radiocesium-bearing microparticles(CsBPs) in suspended particles which were collected from rivers inFukushima by filtering water in 2011-2016. Radiocesium in CsBP
incorporated in the SiO2 glass is generally water-insoluble. Thus,
cesium (Cs) in CsBP is not likely involved in theadsorption-desorption reaction. According to Konoplev et al.
(2016), (i) Kd in rivers in Fukushima are higher than those in
Chernobyl by 1-2 orders of magnitude, and (ii) it is partly becauseradiocesium-bearing microparticles (CsBPs) are present in solidmaterials in Fukushima area. We calculated the ratio of 137Cs in
CsBPs to the total 137Cs in the suspended particles to know theeffect of CsBPs on Kd in rivers. The results of SEM-EDS showedthat the size, shape, and chemical compositions of CsBPs weresimilar to those reported as spherical CsBPs. The radioactivity
ratio of CsBPs to total 137Cs on the filters ranged from 1.4-46%,
which makes logKd value apparently higher by only 0.27. This
result means that the higher Kd in Fukushima than in Chernobyl
could not be explained only by the presence of CsBPs. The fact

－ 135 －

that the presence of high concentration of organic matter in
Chernobyl inhibits strong association of RCs with phyllosilicate
minerals should be considered, which can make Kd lower in
Chernobyl.

1B01 Measurementofthehalf-lives
andtheinternal-conversion electron energy spectra for several
chemical forms of 235mU
SHIGEKAWA, Y.1, KASAMATSU, Y.1, YASUDA, Y.1, KANEKO,
M.2, SHINOHARA, A.1(1Grad. Sch. Sci., Osaka Univ., 2JAEA)
The nuclide 235mU is the isomeric state of 235U with extremely
low excitation energy (76.8 eV), and decays through the internalconversion (IC) process. Because outer-shell electrons are
dominantly involved in the IC process of 235mU, it is indeed
reported that the decay constant (half-life) of the isomer varies
depending on its chemical environment. The half-life variation
does not show simple tendency for some chemical forms of 235mU,
and the mechanism is not understood well. In order to elucidate thedeexcitation process of 235mU, we are trying to measure the energy
spectra of IC electrons in addition to the half-lives for various
chemical environments. In this work, we collected 235mU recoilingout of a 239Pu source on Cu sheets by using Collection Apparatus
for Recoil Products (CARP), and we measured the half-lives andthe energy spectra using a retarding-field type spectrometer. By thereaction of 235mU with several gases (HF, HCl, O2), we preparedsome kinds of chemical forms of 235mU and measured theirhalf-lives and energy spectra. Consequently, we observed clear
difference in half-life and energy spectrum between 235mU on Cu
and 235mU reacted with HF gas. We performed relativistic DFT
calculation to discuss the relationship between the electron orbitals
and the half-lives of 235mU.

1B02 Measurement of total kinetic energy of fission fragments
in SF decay of 254Rf
GOTO, S.1, KAJI, D.2, TSUCHIYA, S.1, AONO, R.1,
MORIMOTO, K.2, HABA, H.2, OOE, K.1, KUDO, H.1(1Niigata Univ., 2Nishina Center, RIKEN)
We are planning to systematically measure properties of
spontaneous fission of rutherfordium isotopes systematically, suchas mass and total kinetic energy (TKE) distributions of fission
fragments, in order to investigate the nature of SF of superheavy
nuclei in detail. Aono et al. observed SF events of 253,254Rf in 208Pb+ 48Ti reaction and measured TKEs in SF decay of 254Rf. The
results showed that TKEs in 254Rf indicated a rather different trand
expected from those in 256Rf. However, the observed TKE hasmuch uncertainty because of poor statistics. In this work, TKE in
SF decay of 254Rf was measured with better statistics in 206Pb + 50Ti
reaction.
Experiments were performed at the RIKEN linear accelerator(RILAC) facility using a gas-filled recoil ion separator, GARIS.
254Rf was produced by 206Pb(50Ti, 2n) reaction. 256Rf was also
produced by 208Pb(50Ti, 2n) reaction. 206Pb and 208Pb targets of~350 μg cmí2 and ~400 μg cmí2 in thickness, respectively, wereprepared by a vacuum evaporation on 60 μg cmí2 carbon foils.
Beam energies of 50Ti were 241 MeV for 206Pb and 239 MeV for

Pb. Average intensity of 50Ti was 280 pnA.
A total of 740 events was observed as SF decay of 256Rf in
206Pb + 50Ti reaction. Deduced half-life is 6.30 ± 0.22 ms, which
agrees with the previously reported value. A preliminary analysis
shows that the half life of 254Rf is about 28 μs which agrees withthe reported value. In the presentation, we will report the results ofanalysis in detail.
208

1B03 Production of isotopes of element 107, Bh in the 248Cm +23Na reaction and their decay studies for chemistry studies of
Bh
KOMORI, Y.1, HABA, H.1, FAN, F.2, KAJI, D.1, KASAMATSU,
Y.3, KIKUNAGA, H.4, KONDO, N.3, KUDO, H.1,5, MORIMOTO,
K.1, MORITA, K.1,6, MURAKAMI, M.1, NISHIO, K.7,
OMTVEDT, J. P.8, OOE, K.5, QIN, Z.2, SATO, D.5, SATO, N.1,
SATO, T., SHIGEKAWA, Y.3, SHINOHARA, A.3, TAKEYAMA,
M.1,9, TANAKA, T.1,6, TOYOSHIMA, A.7, TSUKADA, K.7,
WAKABAYASHI, Y.1, WANG, Y.2, WULFF, S.8, YAMAKI, S.1,
YANO, S.1, YASUDA, Y.3, YOKOKITA, T.1(1RIKEN, 2IMP, 3Osaka Univ., 4Tohoku Univ., 5Niigata Univ.,
6Kyushu Univ., 7JAEA, 8Univ. Oslo, 9Yamagata Univ.)
We plan to study chemical properties of element 107, Bh using
the gas-filled recoil ion separator (GARIS) at the RIKEN linear
accelerator facility. In this work, we investigated production crosssections of Bh isotopes in the 248Cm + 23Na reactions and theirdecay properties such as Į-particle energy and half-life. The Bh
isotopes were produced in the 248Cm(23Na,xn)271–xBh reactions at
the 23Na beam energies of Elab = 121, 126, 131, and 135 MeV. The
evaporation residues were separated in fight from the beam
particles and nuclear transfer reaction products by GARIS andwere extracted to the chemistry laboratory by the He/KCl gas-jet
system. Alpha particles and SF fragments were measured with the
URWDWLQJ ZKHHO V\VWHP 0$121 IRU Į6)-spectrometry. We
observed time-FRUUHODWHGĮ-Į -Į DQGĮ-SF events, and they
were reasonably assigned to 266%KDQGLWVĮ-decay daughter 262Db
and granddaughter 258/U1RFOHDUĮ-ĮFRUUHODWLRQVRQ 265Bh and
267%KZHUHIRXQG7KHĮ-particle energies of 266Bh were observedin the wide range of EĮ ௅40 MeV and the half-life of 266Bh
was determined to be T1/2 = 10.0㸩2.6௅1.7 s. This half-life is about 8times longer than the literature values for 266Bh. The excitation
function for the 248Cm(23Na,5n)266Bh reaction shows the maximum
cross section of ı = 57 ± 13 pb at Elab = 131 MeV.

1B04 High-precision mass measurements of short-lived nuclei
with MRTOF+ GARIS-IINIWASE,T.1,2,
WADA,M.1,3,
SCHURY,P.3,
ITO,Y.1,8,
1,4
1
1KIMURA,S. , ROSENBUSCH,M. , KAJI,D. , MORIMOTO,K.1,
HABA,H.1, YAMAKI,S.1,5, TANAKA,T.1,2, MORITA,K.1,2,
TAKAMINE,A.1,
MIYATAKE,H.3,
HIRAYAMA,Y.3,
WATANABE,Y.3, MOON,J,Y.3,6, MUKAI, M.4, WOLLNIK, H.1,7,(1RIKEN Nishina Center, 2Kyushu Univ., 3KEK, 4Univ. of
Tsukuba, 5Saitama Univ., 6IBS, 7NMSU, 8McGill Univ.)
The binding energy is one of the basic physical quantities, thatis related to stability of nuclei and their decay properties. It can bederived from measuring the mass precisely. A multi-reflection
time-of-flight mass spectrograph (MRTOF-MS) coupled with a－ 136 －

gas-filled recoil ion separator (GARIS- II) is a promising apparatus
for measuring the mass of superheavy nuclei directly. Recently, we
succeeded to measure the mass of several-tens of heavy-nuclides,
which were produced via heavy-ion induced fusion reactions,using MRTOF-MS. The system was applicable to short-lived
nuclides with a few-tens of milliseconds. In this presentation, we
will report their results in detail. In addition, we will also talk about
WKHGHYHORSPHQWRIDQHZĮ-ToF detector, which enables tomeasure both mass of superheavy nucleus and alpha-decay relatedwith it.

1B05 Production of Tc isotopes for Compton Camera(ETCC)
imaging
HATSUKAWA,Y.1, TSUKADA,K.2, HASHIMOTO,K.1, SATO,
T.2, ASAI, M.2, TOYOSHIMA,A.2, NAGAI, Y.1, TANIMORI, T.3,
SONODA, S.3, KABUKI, S.4, KIMURA, H.5, TAKADA, A.3,
MIZUMOTO, T.3, HAYAKAWA, T.1, Takaki, S.2(1QST, 2JAEA, 3Kyoto Univ., 4Tokai Univ., 5Kyoto Pharm. Univ.)
In recent years, the Compton camera which is originallydeveloped for the astrophysical studies was applied for medical
diagnostic usage. For the Compton camera imaging, isotopes
emitting higher energy gamma-rays were required. If technetium
isotope which emits higher energy gamma-rays is available forsynthesizing labelled compound, All of labelled compound which
is previously developed for Tc-99m can be available for Compton
camera imaging using other Tc isotope. Two Tc isotopes, 95mTc(T1/2 = 60 d; EJ = 204, 582 and 835 keV) and 96Tc(T1/2 = 4.28 d, EJ= 778 and 812 keV) are strong candidates for this purpose. These
isotopes were produced by proton irradiation with enrichedmolybdenum trioxide target. In this study, recycling of enrichedmolybdenum targets was developed. Identification of obtainedmaterial was examined by X-ray diffraction, XRD method.
Recovery yield of molybdenum trioxide obtained by this recycling
method are 70-90 %.

1B06 Synthesis of submicron-sized calcium molybdates, using
liposome as a template, and characterization of their
physicochemical properties
KURITA, S.1,YAMASAKI, S.1, OCHIAI, A.2, UTSUNOMIYA,
S.2, SAKAGUCHI, A.1, SUEKI, K.1(1Univ. of Tsukuba, 2Kyushu Univ.)
Technetium-99m has been commonly used for a nuclear
medicine diagnosis and 99mTc is separated from 99Mo. Numerous
99Mo production methods, such as 100Mo(n, 2n)99Mo reaction, havebeen investigated. After the reaction, 99Mo and 99mTc have been
separated from each other by using sublimation method. Then, we
aim to make the method more simplified by preparing the 100Mo
material, which enable us to recover only 99mTc from the material
at operation temperature. We propose submicron calcium
molybdate is better material. In the present study, we focused on
the synthesis method of submicron calcium molybdate using
liposome as a template. Liposome has been used for synthesis of
biocompatible materials such as calcium carbonate and calcium
phosphate nanoparticle. We applied the synthesis procedure using
liposome to the calcium molybdate formation. The calcium
molybdate particles prepared in this study were characterized by

the electron microscopy, zeta potential measurement and so on, toobtain the physicochemical properties such as particle size,
composition, morphology and crystalline. The products, which we
can get under present experiment condition, were identified to becalcium molybdate by the SEM and TEM observation. We discuss
about the properties of the products and the template effect ofliposome on the calcium molybdate formation.

1B07 Production of purified 135mBa for fee-based distribution
using the 133Cs(ĮSQ)135mBa reaction
YANO, S.1, HABA, H.1, KOMORI, Y.1, YOKOKITA, T.1,
TAKAHASHI, K.1, SATO, N.1, OSANAI, M.1(1RIKEN Nishina Center)
Barium-135m (T1/2 = 28.7 h, EȖ = 268.2 keV) is one of the useful
radiotracers of Ba in various research fields such as nuclear
medicine. In this work, we investigated a production method of apurified 135mBa for a fee-based distribution to general public in
Japan.
Barium-135m was produced in the 133Cs(ĮSQ)135mBa reaction
by bombarding a CsCl target with a 50.5-MeV alpha beam fromthe RIKEN AVF cyclotron. After the irradiation, 135mBa waspurified by the reversed-phase extraction chromatography using
the Eichrom Sr resin. We evaluated a thick-target yield and aradionuclidic purity of the purified 135m%DYLDȖ-ray spectrometry.
The thick-target yield of 135mBa was determined to be 2.1±0.1
0%Tȝ$–1 h–1 at 50.5 MeV. This yield is smaller by a factor of 4
than that reported by Dmitriev and Panarin in 1979 at 43.5 MeV.
The chemical yield of 135mBa was about 80%. The radionuclidic
purity of the purified 135mBa was about 70% due to byproducts of133m
Ba and 133gBa. In the symposium, the specific radioactivity andthe chemical impurity of the purified 135mBa will be also reported
after a chemical element analysis with ICP-MS.

1B08 Development of a 211Rn/211At Generator Based on
Dry-Chemistry
NISHINAKA, I.1,HASHIMOTO, K.1, MAKII, H.2(1QuBS, QST, 2ASRC, JAEA)
Astatine-211 is a prospective candidate for target alpha therapy.
Our project focuses on a 211Rn/211At generator. The daughter 211At
of 7.2 h in half-life is generated through EC decay of the parent
211Rn of 14.7 h, expanding time-frame for transportation and use of
211At. In this project, a chemical procedure based on dry-chemistry
has been studied to develop the generator system.
Radon-211 was produced in the irradiation of a thin bismuth target
with 60 MeV 7Li3+ beams from the JAEA tandem accelerator via
the 209Bi(7Li,5n)211Rn reaction. After the irradiation, the 211Rn was
separated from the target and purified in a chemical procedure
based on dry-chemistry using an apparatus for the generator
system. The 211Rn in the apparatus was monitored by lead-shielded
1cm3 CdZnTe solid state detectors. After a half day, 211At
generated from the purified 211Rn was eluted with ethanol.
The overall recovery yields of 211At generated from 211Rn (n=3)
were 35% in the first fraction of the eluted ethanol of 2 mL, 8% in
the second and 1% in the third. The results demonstrate that thechemical procedure based on dry-chemistry could provide theunique ability of the 211Rn/211At generator.

－ 137 －

1B09 Extraction behavior of Astatine into hydrocarbon
solvents
WASHIYAMA, K.1, SHIN, Y.2, YOKOYAMA, A.2,
TOYOSHIMA, A.3,4, KANDA, A.4, SHINOHARA, A.4,
YOSHIMURA, T.5(1Institute of Med. Pharm. and Health Sci. Kanazawa Univ.,
2
College and Institute of Sci. and Eng., Kanazawa Univ.,
3Advanced Sci. Res. Center, JAEA, 4Dep. Of Chem., Graduate
School of Sci., Osaka Univ., 5Radioisotope Res. Center, Osaka
Univ.)
Since astatine-211 (211At) releases alpha particles with amoderate half-life (7.21 h), it is expected to be applied toradionuclide therapy. To obtain a high radioactivity of 211At aftertarget irradiation, rapid and efficient separation method arewarranted. To upgrade the wet chemistry, it is important toestablish an optimal solvent extraction system considering theprocess after separation from the target, but no definitive ones havebeen reported. In this study, we evaluated the extraction behaviorof astatine with respect to several hydrocarbon solvents as anothercandidate of the extraction solvents.
The hydrocarbon solvents used were hexane, octane, decane,dodecane, tetradecane, hexadecane, and some structural isomers ofhexane. After solvent extraction of 211At into hydrocarbons from anitric acid, we determined the distribution ratio (D) as theconcentration ratio of 211At in the aqueous phase and organic
phase.
The D values of 211At into dodecane was increased withincreasing shaking time and reached an equilibrium state after 10
minutes. The D values of 211At into each hydrocarbon solvent with
1M HNO3 increased with molecular weight. In addition, althoughhexane showed a low D value, all other structural isomers showed
high D values. These imply that the 211At extraction correlates not
only to dipole momentum but also to the polarization of eachsolvent.

1B10

Development of a simplified synthesis method for
medicine using resin-supported bifunctional

211At-labeledreagent
KANDA, A.1, TOYOSHIMA, A.2,3, IKEDA, A.1, ICHIMURA, S.4,
ZHANG, Z.1,3, YOSHIMURA, T.3,5, SHINOHARA, A.1,3.
(1Grad. Sch. of Sci., Osaka Univ., 2Advanced Sci. Res. Center,
Japan Atomic Energy Agency, 3 Project Res. Center for
Fundamental Sci., Grad. Sch. of Sci., Osaka Univ., 4Fac. of Sci.,
Osaka Univ., 5Radioisotope Center, Osaka Univ.)
Recently, we aim to develop a new automated 211At separationand labeling method by seamless connection of column-flowlabeling procedure to a dry distillation process. So far, we havedeveloped a new resin, which can hold At and release it to
medicine, used in the column flow method and then performed
batch-wise labeling experiments. In this work, we carried out tolabel proteins with 211At in column-flow experiments. Injected
211At was first held on the resin under an oxidative condition with
N-iodosuccinimide. After quenching excess trimethylstannyl
residue and the oxidant, resin was washed with MeOH/1% AcOH.
Then, proteins in PBS-T were eluted to react with the resin. The
protein effluent was then ultra-filtrated using a membrane filter.

Control experiments without proteins were also carried out. As aresult, radioactivity yields of the labeled protein in the supernatant
was 4.3%, while that of the blank is 0.5%. This result demonstrated
successful 211At labeling of proteins by the column-flow method.
We will also present a column-flow labeling experiment of
ammine in the symposium.

1B11 Developments of quantitative imaging system foralpha-emitting radioisotope 211AtSEGAWA, M.1, NISHINAKA, I. 2, INOUE, T. 3, TOH , Y. 1
(1Japan Atomic Energy Agency, 2National Institute for Quantum
and Radiological Science and Technology, 3Photron)
Radio nuclide therapy using D-particle emitted from 211At is ofcurrent interest because D-particles have higher LET. The
establishment of effective technique to generate 211At has been
recently required. Here, real-time imaging techniques to analyze
the 211At and other radioactive materials generated at the same time
will be great help for the establishment of effective techniques.
Thus, we has developed two real-time camera systems adjusted forhigh resolution imaging and high sensitive imaging for relatively
low-activity D-particles of 211At in the research phase. 211At was
generated by the 209Bi (7Li, 5n) 211Rn Î 211At reaction at Japan
Atomic Energy Agency. In this presentation, the recent results forthe two systems described above are reported.

2A01 Rapid determination of 90Sr in urine samples byextraction chromatography coupled to ICP-MS/MSTOMITA, J.1, TAKEUCHI, E.1(1JAEA)A rapid analytical method of 90Sr in urine samples by extraction
chromatography coupled to triple-quadrupole inductively coupledplasma-mass spectrometry (ICP-MS/MS) was examined.
Strontium in urine sample was purified by phosphate
coprecipitation followed by extraction chromatography. To
eliminate both isobaric (90Zr) and polyatomic (Ge, Se) interference
for 90Sr measurement by ICP-MS/MS, Sr was separated withtandem of Pre-filter, TRU and Sr resin. The measurement of 0.02
M HNO3 solution with 50 mg/L of Sr indicated that tailing of 88Sr
does not impact the measurement of 90Sr at concentrations up to 50
mg/L of Sr. Stable Sr and 90Sr contents in the elution were
measured by high abundance sensitivity ICP-MS/MS with O2 gas
reaction mode. The validation of this analytical method wasconfirmed by the analyses of synthesis urine sample containing the
known amount of 90Sr along with 1 mg of Ge, Se, Sr and Zr. The
detection limit of 90Sr was achieved to be approximately 1.0 Bq perurine sample, and analysis time needed for separation of Sr and
90Sr measurement by ICP-MS was about 10 hours.

2A02Trial measurements of 90Sr with accelerator mass
spectrometry
HOSOYA, S.1, SASA, K. 1, TAKAHASHI, T1., HONDA, M. 1,
SATOU, Y. 2, TAKANO, K. 1, OCHIAI, Y. 1, YAMAGUCHI, K. 1,
SUEKI, K. 1
(1Univ. of Tsukuba, 2JAEA.)－ 138 －

Strontium-90 (90Sr, T1/2 = 28.79 yr) is an important radioactive
nuclide that released into the environment from the Fukushima
Daiichi Nuclear Power Plant (FDNPP) accident. Common
analytical techniques take too much time to analyze 90Sr such as
beta-counting. Recently, the new method with the ICP-MS wasdeveloped for rapid 90Sr measurements. However it lacks sufficienttechnical capacity to assay 90Sr pollution status for the FDNPP
accident. If the 90Sr measurement becomes possible withaccelerator mass spectrometry (AMS), it will be available for the
rapidly and high sensitive 90Sr measurements. There are difficult
problems to be solved for 90Sr AMS in regard to the low beam
current and the isobaric interference of 90Zr. We prepared SrF2
sample mixed with PbF2 powder for high current beams of SrF3-.
Consequently 88SrF3- beam current was obtained about 300 nA.
However, we couldn’t identify 90Sr spectrum, because there were
too many 90Zr in PbF2 powder. Therefore we have to reconsider
about materials of mixed powder. Standard samples were preparedfrom IAEA-PT samples (90Sr =14.7 ± 0.5, 29.6 ± 0.8 Bq/kg).
However standard samples need to remove Zr by chemical
methods because they contain Zr at ~7 ppt. In the future, we have aplan to modify the ion source to achieve the maximum beam
current of 500 nA.

2A03 Speciation analysis of 129I from the Fukushima Dai-ichi
Nuclear Power Plant accident in natural samples
HONDA, M.1, TAKAKU, Y.2, MATSUZAKI, H. 3, SASA, K. 1,
SUEKI, K. 1
(1Univ. of Tsukuba, 2Institute for Environmental Science, 3The
University of Tokyo)
Iodine-129 (129I: t1/2 = 15.7 Myr) has been introduced into theterrestrial environment through spent nuclear fuel reprocessing
operations and nuclear accidents. The regional 129I/127I ratio inJapan was significantly increased by the Fukushima Dai-ichi
nuclear power plant accident. The study of different iodine species,
colloidal iodine and ionic iodine, is essential because its subsurface
transport, fate as well as bioavailability strongly depend on its
physicochemical forms (species). The 129I/127I and iodine amounts
of individual chemical species were identified for pond water from
Fukushima and riverine water from Chiba, Japan. Analyticalresults revealed that colloidal 129I was the dominant species andaccounted for more than 90% of the total 129I present, whereas
ionic 127I was the dominant species and accounted for 50-90% of
the total 127I present. The mobile colloid size of M>0.45μm and
0.45μm>M>10 kDa had the highest 129I/127I ratio as for pond waterand riverine water, respectively. These consequences suggest thatmobile colloids greatly contribute to the transport of 129I in thesubsurface environment.

2A04 Development of ultrasensitive detection techniques forlong-lived radionuclides with the 6 MV tandem accelerator
mass spectrometry system
SASA, K.1, TAKAHASHI, T.1, HOSOYA, S.1, TAKANO, K.1,
OCHIAI, Y.1, HONDA, M.1, OHTA, Y.1, MATSUO, K.1,
MATSUNAKA, T.2, SAKAGUCHI, A.1, SUEKI, K.1.
(1Univ. of Tsukuba, 2Kanazawa Univ.)
A new horizontal-type 6 MV Pelletron tandem accelerator was

installed at the University of Tsukuba in March 2014. After 2 yearsof construction and preparation, the first test on multi-nuclide
AMS has been performed in March 2016. The rare particle
detection system on the 6 MV Pelletron tandem accelerator(Tsukuba 6 MV multi-nuclide AMS system) was designed andconstructed for high-sensitivity detections of 10Be, 14C, 26Al, 36Cl,
41Ca, and 129I, and was also expected to measure otherradioisotopes such as 90Sr. The background of the system for 14C
measurements using the 4+ charge state and the terminal voltage
VT = 5.0 MV was reached down to 14C/12C = 2.4 ×10í16. In
addition, we successfully detected 10Be, 26Al, 36Cl, 41Ca, and 129I by
the multi-nuclide AMS system in 2016. In the case of 10Be AMS,
10
BeOí was extracted from the MC-SNICS and then accelerated
with VT = 6.0MV. As a result, 20.3 MeV Be3+ was detected by afive-DQRGHǻ(í(JDVLRQL]DWLRQGHWHFWRU,VREDULFLQWHUIHUHQFHRI
10
B was eliminated by an absorber cell in front of the detector. The
background of 10Be AMS is lower than 2 × 10í15. In thispresentation, the performance of rare particle detections by themulti-nuclide AMS system will be reported.

2A05  Radiocarbon dating of the famous ancient sutras
written in Asuka, Nara and Heian periods
ODA, H1., IKEDA, K. 2, YASU, H. 3
(1ISEE, Nagoya Univ., 2Faculty of Letters, Chuo Univ., 3Taga HighSchool)We measured radiocarbon ages of the famous ancient sutras
written in Asuka, Nara and Heian periods: Myohorenge kyo
attributed to Nakatomi no Kamatari (AD614-669), Gogatsu
Tsuitati kyo (AD770), Uokai kyo (AD770), Hyakumanntou Darani(AD764-770), Jishinin Darani (AD764-770), Todaiji Nigatsudo
Yakegyo (AD729-767), Abe no Komizumaro Gan kyo (AD871)
and Chusonji Konshi Kingin Kosho kyo (AD1117-1126). The
calibrated radiocarbon ages of 6 samples excluding Myohorenge
kyo and Jishinin Darani were consistent with the paleographicalages. In particular, Hyakumanntou Darani was shown to be theoldest print in the world. If Myohorenge kyo truly written by
Nakatomi no Kamatari, it would be the oldest existing sutra.
However, the calibrated radiocarbon age was 1299-1404 [cal AD]
and the theory was denied by the radiocarbon dating. Jishinin
Darani had been one of the oldest existing prints. Radiocarbon
dating, however, indicated that Jishinin Darani was printed in
1527-1656 [cal AD] and is not one of the oldest prints.

2A06 Search for extraterrestrial 60Fe and 244Pu in manganesecrustsKINOSHITA, N.1, WALLNER, A.2, FROEHLICH, M.B.2,
HOTCHKIS, M.3, FEIGE, J.4, PAUL, M.5, PAVETICH, S.2, TIMS,
S.G.2, FIFIELD, L.K.2, SCHUMANN, D.6, HONDA, M.7,
MATSUZAKI, H.8, YAMAGATA, T.9(1Shimizu Co., 2ANU, 3ANSTO, 4Tech. Univ. Berlin, 5Hebrew
Univ., 6PSI, 7Univ. Tsukuba, 8Univ. Tokyo, 9Nihon Univ.)
Nuclei of 60Fe and 244Pu, etc. are synthesized by multiple
neutron capture reaction, r-process, in explosive environment suchas supernova and neutron star merger. These nuclei present in theprimordial solar system have extinguished now due to theirhalf-lives. Our group has already found twice inputs of 60Fe over a－ 139 －

time period of the last 10 Myr from samples collected from deepsea. The 60Fe and 244Pu detected on the present earth haveinformation for r-process nucleosynthesis as well as supernova
activity at vicinity of the earth. We attempted to measure time
variation of 60Fe and 244Pu from some manganese crust samples. Fe
and Be were chemically isolated from small portion of crusts. 60Fe
and 10Be were measured using an AMS at ANU and MALT,
respectively. Growth rate of crusts were determined by 10Be depth
profile. 239, 240, 244Pu isolated from rest of the sample was measured
using an AMS at ANSTO. Twice input of 60Fe peak was found. In
addition, more than ten counts of 244Pu were detected although
only one count was detected in the previous work. We will show
flux and source for the nuclides using 60Fe/244Pu ratio.

2B01 Chemical reaction and property transformation ofcesium during concentration reduction process using
chlorination-volatilization treatment
KINOSHITA, N.1, JIAO, F.2, NINOMIYA, Y.2, HONDA, M.3,
SUEKI, K.3, ASADA, M.1, KAWAGUCHI, M.1(1Shimizu Co., 2Chubu Univ., 3Univ. Tsukuba)
We have investigated chemical process during concentration
reduction process using chlorination-volatilization treatment. Ash
samples mixed with addictive of CaCl2, MgCl2, or mixture of CaO
and CaCl2 were heated at 500 - 1500 °C. After the heat treatment,
XRD patterns in the slug were measured. In addition,
concentration of Cs in the slug and leaching rate of Cs from theslug were determined by measuring Cs in the slug and leachate.
Vaporization rate of Cs in the samples mixed with 30% of CaCl2
reach up to around 100%. The XRD patterns show presence of
CsCaCl3 in the samples treated at 700 - 900 °C. As a result ofleaching test, more than 50% of water-soluble Cs species wereobserved. The water-soluble Cs is assigned to be CsCaCl3 based on
the XRD patterns. The CsCaCl3 reacts with SiO2 and Al2O3 underhigh temperature, then CsCl produced by the reaction is vaporized.
When mixture of CaO and CaCl2 is used as an addictive,complicated compound Ca-Al-Si-O-Cl is once produced. Cl
produced by decomposition of the compound reacts with Cs. The
CsCl is effectively vaporized because a decomposition
temperature of the compound is higher.

2B02 Removal of iodide in water by bismuth-based adsorbents
LEE, S.-H. and TAKAHASHI, Y.
(Department of Earth and Planetary Science, Graduate School of
Science, The University of Tokyo)
Radioactive iodine (I) is an inevitable radioactive contaminantfrom the processing of nuclear power plant and nuclear accident.
Recent studies have shown that silver-based adsorbents such as
silver oxide, silver-impregnated activated carbon and iron oxideare effective for the removal of iodine in water. Although thesilver-based adsorbent has provided effective removal of iodine
species in wastewater, high cost is still challenge to field
application. In order to overcome this limit of silver-based material
in wastewater treatment system, various adsorbents such as copperoxide, graphene oxide and manganese oxide have been
investigated in an attempt to develop cost-effective adsorbents. In
this study, bismuth(Bi)-based materials were studied as promisingadsorbents for the replacement of silver-based adsorbents. In order
to investigate the feasibility of iodine adsorption in water, several
types of bismuth-based materials such as bismuth oxide, bismuth
nitrate, bismuth carbonate and bismuth-containing layered doublehydroxide were prepared by facile co-precipitation method. In thistalk, the adsorption feasibility of iodide which is the dominant
iodine species in water by bismuth-based adsorbents will bemainly discussed with regard to adsorption efficiency.

2B03 Removal and Recovery of Cesium by Heteropolyacid
Salts from High-Level Radioactive Waste
SUZUKI T., IKEZU S., SAKATE Y., KATANO T., TACHIBANAY.
(Nagaoka Univ. of Technology)
We have proposed the novel reprocessing process with nuclide
separation based on the chromatographic techniques in HCl
solution system. In this reprocessing system, the high radiation
nuclides are desired to be removed before sending the spent fuelsolution to main process. Radioactive cesium is one of the mainradiation generators in the spent fuel. It is well-known that theheteropolyacid salts have a high cesium selectivity and a highcesium adsorption capacity. We tested the ammonium
molybdophosphate (AMP) and the ammonium tungstophosphate(AWP) for the cesium removal from high-level radioactive waste.
The distribution coefficients in HCl solution are evaluated, and it
was confirmed that both AMP and AWP have a high cesium
selectivity. In addition, we synthesized the silica supported type
AMP (AMP-silica) and AWP (AWP-silica) for use of column
separation method. We carried out the column separation
experiments (breakthrough chromatography and elution
chromatography) using the simulated high-level radioactive waste(HLW) or the simulated HCl type HLW. As results, we confirmedthat the cesium can be removed from HLW in the both cases(HNO3 and HCl).

2B04 The effect of quench and its reduction for direct
measurement of tritium in green tea
TOGARI, A.1, AZUMA, K.1, ZHOU, Q.2, HATANO, Y.3, HARA,
M.3, CHIKADA, T.1, OYA, Y.1(1Grad. School of Sci., Shizuoka Univ, 2Fac. of Sci., Shizuoka
Univ., 3HRC., Univ. of Toyama.)
For measuring tritium radioactivity in liquid sample, Liquid
Scintillation Counter (LSC) is generally used. As an organic
scintillator, 2,5-diphenyloxazole is widely applied. However, when
LSC measurement is applied to green tea, a band around 350 nm –450 nm in emission spectrum of PPO overlaps with a band around300 – 500 nm in absorption spectra of chlorophylls and it cause theconsiderable reduction of counting efficiency by quenching effects.
To avoid this reduction, isolating tritium water from the green tea
by distillation method is typically performed. If green tea samples
can be decolorized by some chemical reactions, simple and direct
measurement by using LSC is possible. In this study, tritium-doped
green tea samples were prepared. 30 wt% hydrogen peroxide
solutions were added to each sample at different proportions. To
elucidate the effect of quench and its prevention, absorption
spectrophotometry was performed in addition to LSC－ 140 －

measurement. As a result, the reduction of quench effect wasobserved for samples which hydrogen peroxide was added. The
counting efficiency corresponded to absorption spectra of samples
around 300 nm. In addition, heating the samples also resulted indecrease of absorbance and increase of counting efficiency.

2B05 Evaluation of calibration curve in neutron activation
analysis
MIURA, T.1(1NMIJ)
Instrumental neutron activation analysis with the internal
standardization was applied to the precise determination of Br in
polypropylene resin of candidate certified reference material. The
known amount of 197Au was used as an internal standard tocompensate for neutron flux inhomogeneity, to improve the J ray
measurement uncertainty and the linearity of the calibration curves.
The neutron activations were performed using JRR3 Pn1, KUR
Pn3 and KUR TcPn. In this study, the linearity of calibration
curves were examined on the three neutron irradiation conditions.
Unfortunately, the decrease of linearity in calibration curve wasoccurred in the irradiation at JRR3 Pn1. The cause of the decreaseof linearity in calibration could be predicted to loss of Br byneutron irradiation. On the other hand, the analytical result of Br in
the sample on irradiation at KUR Pn3 and KUR TcPn wasconsistent with that obtained by ID-ICPMS. The relative expanded
uncertainty (k = 2) was 1.5 %, and it was equivalent to that of
IC-ICPMS.

2B06 Radiochemical measurement of photonuclear reaction
yields for photon activation analysis
OURA, Y., TERASAKI, H., YAMAGUCHI, Y., IKEDA, H.,
KUROIWA, N., ENDO, I., MIURA, Y., TANAKA, Y.
(Tokyo Metropolitan Univ.)
Relative reaction yields of (J, n) reaction induced bybremsstrahlung of maximum end-point energy (E0) of 30 MeV to
20 MeV were measured for the target nuclides with mass number
from 12 to 204. Relative yields were systematically increased withan increase of target mass number (At), that is, a good linear
correlation was obtained in double logarithmic plot. Yields for (J,n) reactions producing isomers, however, were smaller than thesystematic yield. The slope of the correlation between yields and at
obtained by irradiation at E0 = 20 MeV were slightly steeper for at
E0 = 30 MeV. With correlation obtained in this work, any yieldratio can be roughly estimated. And using our relative reaction
yields elemental contents can be determined by a single
comparator method without standard samples.

3A01 Electron spin resonance dosimetry by measuring CO2
radicals in monkey teeth and deciduous teeth of Japanesechildren
OKA, T.1,2, TAKAHASHI, A.3, KOARAI, K.2, KINO, Y.2,
SEKINE, T.1,2, SHIMIZU, Y.4, CHIBA, M.4, SUZUKI, T.4,
OSAKA, K.4, SASAKI, K.4, URUSHIHARA, Y.5, SUZUKI, M.6,
SHINODA, H.4, FUKUMOTO, M.7(1IEHE, Tohoku Univ., 2Grad. Sch. Sci., Tohoku. Univ., 3Tohoku

Univ. Hospital, 4Grad. Sch. Dent., Tohoku. Univ., 5NIRS, QST,6IDRRR, Tohoku Univ., 7Dep. Mol. Path., Tokyo Med. Univ.)
The release of radioactive materials from the nuclear power
plant accident in atmosphere results in an ionization radiation
exposure to human beings and animals, the precise dosimetry is
required on the point of view of the radiation protection andradiation safety. Electron spin resonance (ESR) method is one of apowerful tool that has been used in the study of dosimetry bymeasuring CO2 radicals of teeth. In this work, we obtained therelationship between the intensity of CO2 radical and the absorbed
dose for monkey teeth and deciduous teeth of Japanese children.
The detection limit for deciduous teeth of Japanese children was
estimated to be 34 mGy (+- 16 mGy). We developed the novel
enamel-isolation technique and applied it for monkey teeth, thedetection limit of monkey teeth seems to be reduced.

3A02 History estimation of Sr-90 movement in environments
by measurements of Sr-90 in hard tissues of cattle sufferedfrom the Fukushima Daiichi Nuclear Power Plant accident
NISHIYAMA, J.1, KOARAI, K.1, KINO, Y.1, SHIMIZU, Y.2,
TAKAHASHI, A.3, SUZUKI, T.2,5, CHIBA, M.2, OSAKA, K.2,5,
SASAKI, K.2, URUSHIBARA, Y4, FUKUDA, T.6, ISOGAI, E.7,
OKA, T.1,8, SEKINE, T. 1,8, FUKUMOTO, M.9, SHINODA, H.2(1Dept. Chem., Tohoku Univ., Japan, 2Grad. Sch. of Dent., Tohoku
Univ., Japan, 3Tohoku Univ. Hospital, Tohoku Univ., Japan,
4
NIRS., Japan, 5IRIDS., Japan, Tohoku Univ., Japan, 6Fac. of Sci.
and Eng., Iwate Univ., Japan, 7Grad. Sch. of Agric. Sci., Tohoku
Univ., Japan, 8IEHE, Tohoku Univ., Japan, 9Tkyo medical Univ.,
Japan)We determined Sr-90 in hard tissues of cattle that were bornafter the Fukushima Daiichi nuclear power plant (FNPP) accident.
Radioactivity of Sr-90 was measured with low background 2ȧ
gas-flow GM counter after chemical separation with nitric fuming
acid. To remove ambiguity of radioactivity concentration due tothe individual difference in cattle, we used specific activities whichwere ratio of activity to mass of the stable isotopes in the sample.
Furthermore, to correct difference in individual contamination,
ratio of the specific activity of the bone to that of the tooth wasintroduced for discussion. Almost the specific activity ratios wereless than one and suggesting that the specific activity in theenvironment would have been decreased with an increase of theelapse time from completion of the teeth formation. To estimate thedecrement, we made a model of the time course change of Sr-90
concentration in hard tissues taking the growth of the cattle into
account.

3A03 Transfer mechanism of Sr-90 and Cs-137 fromenvironment to cattle teeth at the formation period of theteeth.
KOARAI, K.1, KINO, Y.1, NISHIYAMA, J.1, KANEKO, H.1,
TAKAHASHI, A.1, SUZUKI, T.1, SHIMIZU, Y.1, CHIBA, M.1,
OSAKA, K.1, SASAKI, K.1, URUSHIHARA, Y.2, FUKUDA, T.3,
ISOGAI, E.1, OKA, T.1, SEKINE, T.1, FUKUMOTO, M.4 and
SHINODA, H.1
㸦1Tohoku University, 2QST, 3Iwate University, 4Tokyo Medical
University㸧－ 141 －

We have investigated transfer mechanism of Sr-90 and Cs-137
from environment to cattle teeth. Collection sites were in theex-evacuation area of the Fukushima-Daiichi Nuclear Power Plant(FNPP) accident. Sr-90 and Cs-137 specific activities, the ratio of
the radioactivity to the weight of the stable isotopes, could provide
evidences of the transfer of the nuclides. Sr-90 specific activities inteeth might correspond with those in exchangeable fractions (F1:
Water soluble fractions, F2: Ion exchangeable fractions) of soils.
The specific activities should change depending on the diffusion of
Sr-90 and concentration of its stable isotopes in the environment.
Cs-137 specific activities in the teeth were the same as those in theF2 but higher than those in the F1. Cs-137 specific activities in theF2 corresponded to teeth. Cs-137 in the F2 was main component of
the exchangeable fractions. We estimate the transfer mechanism of
the nuclides by comparison of the specific activities among soils,
the exchangeable fractions, plants and the teeth.

Haruna and Lake Onuma, which are located at high altitude in
Gunma Prefecture, Japan. The concentration of 134Cs and 137Cs
was determined by germanium detectors. We also measured theconcentration of 210Pb to estimate the sedimentation rate at eachsampling site. At Lake Onuma, the 134Cs/137Cs activity ratio at theupper layer was almost 1.0 (decay-collected to 11 March 2011),
indicating that radiocesium in the sediment samples was derived
from the FDNPP accident. The inventories of 134Cs for the outlet,
inlet and center of Lake Onuma were estimated to be 2.8 × 104, 2.2
× 104 and 1.4 × 104 Bq/m2, respectively. The sedimentation rate forthe outlet, inlet and center of Lake Onuma was 0.091, 0.092 and
0.060 g/cm2/y, respectively. The inventories of 134Cs and thesedimentation rates at Lake Onuma suggested that theaccumulation of rediocesium at the center resulted fromatmospheric deposition. In the inlet and outlet of the lake,suspended particles adsorbed radiocesium were transported fromsurrounding soils and accumulated to the sediment.

3A04 Transfer of cesium to cultivated mushroom and its
existing form in substrates
MURANOI, T.1, KINO, Y.1, ITABASHI, Y.2, NAKAJIMA, T.2,
KORIYAMA, S.2,
KIMURA, E.2, SHIGIHARA, T.2(1Dept. of Chem., Tohoku Univ., 2Kinokkusu Co.)

3A06 Study on Migration Behavior of Suspended Solids in the
Kumaki River Using Carbon-Nitrogen Isotope Ratio andRadionuclides
TAHARA, R., NAGAO, S., OCHIAI, S, HASEGAWA, T.,
GOTOU, M.
(Kanazawa, Univ.)

High ability to accumulate cesium in mushrooms has been
widely reported after the Chernobyl accident. After the
Fukushima-Daiichi Nuclear Power Plant accident, radioactive
cesium contamination of fungi has rather affected cultivatedmushroom industries than other plants ones. In order to reveal achemical behavior of the cesium in substrates for cultivatedmushrooms, we analyzed the substrates by extracting water solublecomponent under the various conditions. We determinedradioactivities of cesium-137 in extract with a high purity Ge
semiconductor detector. We also determined concentration of
stable cesium in those samples by an ICP-MS. We found different
behavior between stable and radioactive cesium in the substrates.
The results suggested that the chemical form of radioactive cesiumin the substrate should be different from that of stable cesium.
Since the substrate was made with trees cut just after the accident,
radioactive cesium from the surface of the trees has not been
sufficiently diffused into the substance. Additionally, to closely
investigate the chemical form of radioactive cesium in the extracts,
we separated the extracts by acid treatment and paper
chromatography.

The dilapidation of Satoyama is in progress in the rural area ofJapan. The decline of the agriculture and forestry workers is caused
by depopulation of human and reflects to the increases in theabandonment of paddy filed and forest. As a result, the possibilityof erosion of soil surface occur on the abandonment area. In thisstudy, we collected suspended solid and investigated water quality
in the Kumaki River, Nanao City, Isikawa Prefecture from April
2016 to January 2017. Temporal variation of the transport ofsuspended solid was studied using gamma ray measurement of
137
Cs, 210Pbex and 7Be deposited from atmosphere, and isotopic
ratio of C (13C/12C) and N (15N/14N). The concentration ofsuspended particles was the highest in September after heavy rain
event with 25 mm/h. This result indicated that the characteristics ofsuspended solid at downward flow depend on the surrounding
environment and rain events.

3A05 Sedimentation Processes of Radiocesium at Mountain
Lakes in Gunma Prefecture, JapanMIYASAKA, S.1, NAGAO, S.1, OCHIAI, S.1, SUZUKI, K.2,
MORI, M.3
(1LLRL, Univ. of Kanazawa, 2Gunma Prefectural Fisheries
Experiment Station, 3Univ. of Kochi.)
The massive Tohoku Earthquake and consequent tsunamis
occurred on 11 March 2011and damaged the Fukushima Daiichi
Nuclear Power Plant (FDNPP) seriously. Through the FDNPP
accident, a large amount of radiocesium was released to theenvironment. In this study, we collected sediment cores at Lake

3A07 Fractionation of Zirconium-Hafnium in
Ferromanganese Crusts
INAGAKI, J.1, SAKAGUCHI, A.1, INOUE, M.2, HABA, H.3,
KASHIWABARA, T.4, YAMASAKI, S.1, KIKUCHI, S.4,
KANEKO, H.5, KOTANI, H.1, TAKAHASHI, Y.6, USUI, A.7,
SUEKI, K.1(1Univ. of Tsukuba, 2Hiroshima Univ., 3RIKEN, 4JAMSTEC,
5JAEA, 6Univ. of Tokyo, 7Kochi Univ.)
The Zr- Hf pair is known as a “geochemical twin”, and Zr/Hfconcentration ratio in various systems are theoretically the same as
is found in chondrite meteorites. However, significant
fractionation of the two elements between seawater andferromanganese crusts (FMCs) has been reported. In this study, we
have attempted to clarify the accumulation/fractionation
mechanisms of Zr and Hf in ferromanganese crusts (FMCs) byperforming Zr and Hf adsorption experiments with XAFS analysis－ 142 －

for synthesised and natural FMCs obtained from seamounts. The
observed Zr chemical states in natural FMCs resembled those for
FRSUHFLSLWDWLRQV ZLWK IHUULK\GULWH DQG į-MnO2. In adsorption
H[SHULPHQWVIRU=UDQG+IWRIHUULK\GULWHDQGį-MnO2, it was foundthat Hf had larger KD values for both minerals than Zr. In thesecases, the observed Hf-O bond lengths were slightly shorter thanthose of Zr-O in the synthesized minerals.

3A08 Heterogeneous distribution of radionuclides in bottom
sediments of the cooling pond affected by the 1986 Chernobyl
Nuclear Power Plant accident
UEMATSU, S.1, KANIVETS, V. V.2, YAMASAKI, S.1,
RAHMAN, I. M. M.3, KIRIEV, S.4, SAKAGUCHI, A.1(1CRiED, Univ. of Tsukuba, 2Ukrainian Hydrometeorological
Institute, 3IER, Fukushima Univ., 4Chernobyl ECOCENTRE)
The cooling pond (CP) at the Chernobyl Nuclear Power Plant
was contaminated with a large quantity of radionuclides due to theaccident in 1986. The water level of the CP has been declining
since 2014, leading to changes in water quality (e.g. water pH),affecting the solid-liquid distribution of major radionuclides, 90Sr,
137Cs, 241Am and Pu. Better understanding the behaviour ofradionuclides is useful to estimate the radiation effects on biota insurrounding environments. The objective of this study was toinvestigate the inventory of radionuclides in the bottom sedimentsin the CP. Core samples (depth 0-55 cm) of the bottom sediments
were collected from 18 different sites in the CP. The 137Cs and241Am concentrations in these sediment samples were determinedby a Ge detector. The inventory of 137Cs ranged between
0.070-21.6 MBq m –2 and that of 241Am varied 0.055-38.3 kBq m–2
among these sites, showing the heterogeneous distribution ofradionuclides in the bottom sediments. All the Chernobyl-derived
137Cs existed in sediments within the depth shallower than 55 cm
for all these sampling sites, except for two sites with the water
depth > 9 m for which the radionuclides in sediments weredetected even at 55 cm depth.

3A09 Temperature effect on soil-soil solution distribution
coefficient of radiocesium
TAGAMI, K.1, UCHIDA, S.1, KIKUCHI, H.2, KOGURE, N.2(1QST-NIRS, 2Tokyo Nuclear Services Co.)A long-term after deep underground disposals of high level
nuclear wastes, long-lived radionuclides may reach to thebiosphere through groundwater movement. To assess radiationdose from these radionuclides, mathematical models have beenused and environmental transfer parameters are needed to themodels. During the long-term, climate changes are expected;
therefore, it is necessary to check whether such transfer parameters
are sensitive to the temperature condition or not. In this study, wemeasured soil-soil solution distribution coefficient (Kd) ofradiocesium collected under different temperature conditions, i.e.,1  DQG  Û& )RU WKLV VWXG\ IRUW\ DJULFXOWXUDO ILHOG VRLO
samples (air-dried, <2 mm) were used and three subsamples weremade for each sample. Ten mL of Milli-Q water was added to 1 gsoil sample; after 24 h pre-shaking, a known amount of 137Cs wasadded to the soil-water mixture and the mixture was shaken for
additional seven days. The water phase (<0.45μm) was separated

and measured the 137Cs activity with an NaI(Tl) scintillation
counter. For twenty upland field soil samples, geometric mean Kd
values at   DQG Û& ZHUH    /NJ
respectively; KdV DW Û& ZHUH VLJQLILFDQWO\ ORZHU WKDQ WKRVH DWÛ&

3A10 Transport processes of earth surface materials based on
fallout radionuclides in reservoir-catchment system
OCHIAI, S.1, MIYATA, Y.1, NAGAO, S.1, MATSUKI, A.1,
UTSUNOMIYA, D.1,2(1Kanazawa University, 2Suzu City)
To investigate the transport processes of earth surface materials
in reservoir-catchment system, temporal changes in deposition of
fallout radionuclides (210Pb and 7Be) and their sedimentation in theirrigation reservoir (Shin-ike) were observed in Suzu City.
Sedimentation fluxes of 210Pb and 7Be were observed during one
month with sediment trap installed in the reservoir during June
2016 to April 2017. Atmospheric deposition rate of 210Pb and 7Be
were also observed with a collecting pan for same intervals of
sediment trap.
Deposition rates of 210Pb and 7Be ranged 0.5-5.5 Bq m-2 day-1
and 3.4-25 Bq m-2 day-1, respectively, and showed clear seasonal
fluctuation with high deposition rate during winter and low during
summer. Sedimentation flux of 210Pb to the reservoir bottom wasmuch larger than 210Pb deposition rate, suggesting that discharged
210
Pb from the catchment was major source to reservoir sediment.
On the other hand, sedimentation flux of 7Be was almost samelevel with deposition rate, suggesting that the contribution of thecatchment-derived 7Be to sediment is negligible. These differencesin contribution to reservoir sediment may be associated with thetimescale of material discharge from the catchment and half-livesof these nuclides.

3B01 Thermodynamic study on the Pu(IV) solubility in thepresence of carbonate
KOBAYASHI, T.1,SASAKI, T.1(1Kyoto University.)
The solubility of amorphous plutonium hydroxide(Pu(OH)4(am)) was investigated in carbonate solutions containing
dilute to concentrated sodium nitrate (NaNO3). The sample
solutions were prepared by undersaturation method in the ranges of
pH = 8 – 12, total carbonate concentration ([C]tot) = 0.01 – 0.16 M,
and ionic strength (I) = 0.1 – 5.0 M NaNO3. After the given aging
period at 25 ºC under At atmosphere, supernatants of the sample
solutions were ultra-filtrated through 10 kDa (ca. 3 nm pore size)
membranes. The Pu concentration in the filtrates was determinedby alpha spectrometry. The observed dependence of Pu solubilityon the hydrogen ion concentration (pHc) and [C]tot suggested theformation of Pu(CO3)4í, Pu(CO3)5í, and Pu(OH)2(CO3)2í as thedominant species in neutral to weakly alkaline pH regions. The
solubility at certain pHc values and carbonate concentrations
slightly increased with an increase of ionic strength. By applying
the specific ion interaction theory (SIT), the solubility data at
different pHc, [C]tot, and I were analyzed to determine theformation constants of the Pu carbonate complexes and their ion
interaction coefficients. The obtained values well reproduced the－ 143 －

solubility data and the determined parameters are discussed incomparison with those of tetravalent actinide carbonates.

3B02 Study of the reactivity of electrodeposited U(IV)OUCHI, K.1, OTOBE, H.1, KITATSUJI, Y.1(1 Japan Atomic Energy Agency)
In this study, we investigated 1) the change on standing ofdeposition amount and 2) the catalysis by the deference of deposit
stares to obtain knowledge of the reactivity of electrodeposited
U(IV). 1) The change on standing of deposition amount wasmeasured. After electrolysis was stopped, the U deposits on theelectrode surface decreased regardless of the presence or absenceof U(VI) ion. When the oxidation potential (+0.2 V) was applied,the decrease of the deposits was faster than that of stopping
electrolysis. On the other hand, when the reduction potential (-0.35
V) was applied, the decrease of the deposits was not observed.
These results indicate that the decrease of U deposits is caused byoxidative dissolution (U(OH)4 Ѝ UO22+ + 2H2O + 2e-). 2) U
deposits of just deposition and 40 min later were formed and therates of the reduction and deposition of U were measured. The
rates of the reduction and deposition on U deposits of 40 min later
were higher than that on deposits of just deposition. Thus, wefound that U deposits of 40 min later have better catalytic activity.

3B03 Chemical effect on muon capture process for ironcompounds
NANBU, A.1,NINOMIYA, K.1, INAGAKI, M.1, KUDO, T.2,
TERADA, K.1, SATO, A.1, TOMONO, D.3, KAWASHIMA, Y.3,
SHINOHARA, A.1,
(1Graduate School of Science, Osaka Univ., 2School of Science,
Osaka Univ., 3RCNP, Osaka Univ.)
A muon can make an atomic muon orbit around a nucleus whenthe muon stopped in a substance. Such an atom is called muonic
atom. In muonic atom formation process, muon capture probability
in each atom and initial quantum state of the captured muon arestrongly influenced by the chemical environment of the muon
capturing atom (chemical effect). There are many studies toinvestigate chemical effect on muon capture process, however, thedetail processes have still been puzzled. In this study, we
performed systematic study on muon capture processes for ironcompounds to investigate chemical effect in muon capture. The
muon irradiation experiments were carried out at MuSIC-M1 beamline in RCNP, Osaka Univ. We prepared Fe, Fe2O3, FeS, FeO and
FeCl2 for muon irradiation samples, and measured muonic X-raysby HPGe detectors. From muonic X-ray spectra, we determinedmuon capture ratios and muonic X-ray intensity patterns. Per atommuon capture ratio and initial state of captured muon in eachsample will be discussed on the presentation.

3B04 Production
andcharacterizationofPm
metallofullerenes using 143Pm produced by photon nuclear
reaction.
AKIYAMA, K.1,3, MIYAUCHI, S.1, AMEKURA, K.1, ITO, K.1,
KIKUNAGA, H.2, HABA, H.3, KUBUKI, S.1(1Tokyo Metropolitan Univ., 2ELPH, Tohoku Univ., 3RIKEN

Nishina Center)
Promethium (Pm) metallofullerene is known as the missing
lanthanide metallofullerene because all isotope of Pm is unstable.
Recently, we have tried to produce Pm metallofullerenes and foundthat the most dominant metallofullerene is Pm@C82 encapsulating
trivalent Pm from the HPLC analysis. However, to obtain further
information about the chemical properties of Pm metallofullerenes,
it is required to employ the Pm with higher specific radioactivity
because the restriction in the porosity of carbon rod used for the
metallofullerene generation. Here, we report successful productionof Pm metallofullerene with higher specific radioactivity by usingchemically separated 143Pm and also report the detailed HPLC
elution behavior of them.
As the results of detailed HPLC analysis, it is found small
differences in the HPLC retention time between 143Pm@C82 and139Ce@C used as the internal standard. It is known that the HPLC
82
retention time of lanthanide M@C82 is systematically increased
with increase of the atomic number for the encapsulated metal
atom M. It is found that the HPLC retention time of Pm@C82 iscorrespond to this systematics.

3B05 57Fe Mössbauer spectroscopic study of oxidation statesof polynuclear iron hydride clusters supported by phosphines
SAKAI, Y.1 , ARAAKE, R.2, TADA, M.2, OHKI, Y.2(1Daido Univ., 2Nagoya Univ.)
Polynuclear iron hydride clusters, containing multiple iron andhydrogen atoms, are of relevance to intermediates in the biologicalreductive fixation of N2, where the active state of FeMo-cofactor of
enzyme nitrogenase is proposed to possess Fe-H-Fe hydrides. In
the Habor-Bosch process operated in the industrial production ofammonia, metallic iron is treated with a mixture of N2 and H2 andthe Fe-H species need to be formed prior to the N-H bondformation.
We have synthesized and characterized several novel iron
hydride clusters, and then have examined the catalytic abilities forthe reduction of nitrogen molecules. One of the chemical
characterization tools is 57Fe Mössbauer spectroscopy, by which
the oxidation states of iron atoms of the iron hydride clusters canbe elucidated non-destructively. In the present JNRS annual
meeting, Mössbauer spectra are reported for the novel clusters of
Fe4 ȝ-H)4 ȝ-H)2{N(SiMe3)2}2(PMe2Ph)4,Fe6 ȝ-H)10 ȝ-H)2(PMe3)10 and so on, the isomer shifts of which
are discussed in order to obtain clues for clarifying the catalyticroles of each iron atom sites of the clusters.

3B06 Investigation of intracellular iron in Escherichia coli andAmphibacillus xylanus lacking a respiratory chain by in vivo
Mössbauer spectroscopy
ARIMA, H.1, OHNO, Y.1, KAWASAKI, S.1, KIMATA, S.1,
TAKEDA, K.2, NIIMURA, Y.1, NAKAMOTO, T.3, TAKAYAMA,
T.4, and SAKAI, Y.4(1Dep. of Bioscience, Tokyo, Univ. of Agriculture, 2Teachar
education course, Tokyo, Univ. of Agriculture, 3Toray ResearchCenter, 4Dep. of Chemistry, Daido, Univ.)
Iron must be reduced from Fe3+ to Fe2+ when organisms use it in－ 144 －

the cells. However, Fe2+ can be a generator of the most toxic
reactive oxygen species, hydroxyl radical (•OH). Thus,
intracellular iron may behave as a double-edged sword in thepresence of oxygen. To understand the relationship between
oxygen and iron, the intracellular ratios of Fe2+/Fe3+ in twobacterial cells, Escherichia coli (E. coli) with a respiratory chain
and Amphibacillus xylanus (A. xylanus) lacking a respiratory chain,
which were cultured under aerobic and anaerobic conditions, were
measured by Mössbauer spectroscopy (78 K). In A. xylanus, theboth aerobic and anaerobic cells showed only IS values
corresponding to Fe3+, which also revealed a six- coordinate
complex. In contrast, in E. coli, the ratio of Fe2+/Fe3+ was estimatedto be 31/69 and 28/72 for the aerobic and anaerobic cells,
respectively. From the IS values for Fe3+, it was proved that a
six-coordinate complex of Fe3+ was formed in the aerobic cellwhile a four- coordinate complex in the anaerobic cell. These
results suggested that intracellular composition of Fe-chelator
complexes might be altered in response to oxygen.

3B07 Dynamic Behavior of Impurity Ga in Magnetite
SUGIMOTO, T.1,TAKENAKA, S.1, FUJISAWA, T.1, SATO, W.1,2(1Grad. Sch. Nat. Sci., Tech. Kanazawa Univ., 2Inst. Sci. Eng.,
Kanazawa Univ.)
Fe3O4 shows ferrimagnetism with TC = 858 K, having highelectric conductivity. Thus, application of this compound to
spintronics has been highly expected. In our previous PAC study,
we doped Fe3O4 with In and found that In atoms show thermal
migration from the A site to the B site. This result is interesting interms of the possibility that charge transportation can occur incoincidence with magnetic transition at TC. Therefore, we directed
our interest to Ga-doped Fe3O4 in expectation that more prominent
dynamic behavior of the impurity atoms can be observed due to thesmaller ionic radius of Ga ions than that of In ions.
0.5 at. % Ga-doped Fe3O4 was doped with radioactive 111In ionsas the PAC probe, and their hyperfine fields were investigated in awide temperature range from 298 to 1073 K by the PAC method.
Above TC, the PAC spectrum at 873 to 1073 K (>TC) shows gradualattenuation of the directional anisotropy and they were fitted withtwo different components: one exhibits the static perturbation byelectric quadrupole interaction, and the other the dynamic
perturbation showing exponential relaxation. It is considered that
this relaxation reflects the relative dynamic behavior of the probe
nucleus to the extranuclear fields.

3B08 Liquid-liquid extraction of element 104, Rf, in Aliquat
336/HCl system
KONDO, N.1, KASAMATSU, Y.1, NAGASE, M.2, YASUDA, Y.1,
SHIGEKAWA, Y.1, OUCHI, K.1, KANDA, A.1, NINOMIYA, H.1,
WATANABE, E.2, HABA, H.3, KUBOKI, Y.3, KOMORI,Y.3,
YOKOKITA, T.3, YANO, S.3, SATO, N.3, SHINOHARA, A.1(1Grad. Sch. of Sci., Osaka Univ., 2Fac. of Sci., Osaka Univ., 3
RIKEN Nishina center.)
The purpose of this study is to investigate the liquid-liquid
extraction behavior of Rf with Aliquat 336. In our previous study,
we carried out the liquid-liquid extraction experiment of Zr and Hf
as a model experiment of Rf, and investigated the dependence ofdistribution ratios (D) of Zr and Hf on the concentration of theAliquat 336 by batch method. In addition, we developed the flow
Injection Solvent Extraction apparatus for superheavy elements(ISE). In this work, we produced 261Rf (T1/2 = 68 s) and 169Hf (T1/2= 3.24 min) in the 248Cm(18O,5n)261Rf and natGd(18O,xn)169Hf
reactions, respectively, at the RIKEN AVF cyclotron, and carriedout extraction experiment of Rf in 9.3 M HCl / Aliquat 336-CHCl3
system. In this experiment, the reaction products were transportedby the He/KCl gas-jet system to a chemical laboratory, and weredissolved in aqueous solution with the dissolution apparatus. The
aqueous and organic solutions were injected to the ISE. After that,
we collected two phases separately on different Ta plates andperformed Į-particle measurement for the samples. As a result, we
obtained 63 Į counts of 261Rf and 257No and acquired the D valuesof Rf.
㻌㻌
3B09 The reversed-phase chromatography for element 105,
Db in hydrofluoric acid system with Aliquat 336 resin
SATO, D.1, MURAKAMI, M.1, GOTO, S.1, OOE, K.1,
MOTOYAMA, R.1, SHIRAI, K.1, YAMADA, R.1, TSUCHIYA,
S.5, MORIYAMA, T.1, HABA, H.2, KOMORI, Y.2, YANO, S.2,
TOYOSHIMA, A.3, MITSUKAI, A.3, KIKUNAGA, H.4, KUDO,
H.5.
(1Grad. Sch. Sci. and Tech., Niigata Univ., 2Nishina Center,
RIKEN, 3JAEA, 4Res. Center for Elec. Photon Sci., Tohoku Univ.,
5Fac. Sci., Niigata Univ.)
In order to clarify chemical properties of Db, we studied
liquid-liquid and solid-liquid extraction of Nb and Ta from HF
solutions with Aliquat 336 in batch experiment. In addition,
on-line chromatography experiments for Nb and Ta using ARCA
were also carried out, and the extraction behaviors of Nb and Ta in
2.7 M HF and 27 M HF reproduced the results of batch
experiments. On the basis of these experimental results ofhomologues, in this work, chemical experiment of Db was
performed with 2.7 M and 27 M HF. The isotope 262Db was
produced in the 248Cm(19F,5n)262Db reaction with RIKEN AVF
cyclotron. The reaction products were transported with He/KCl
gas-jet system to laboratory and deposited on collection part in
ARCA. After dissolved in 2.7 M or 27 M HF, those were loaded
into micro-column filled with 52 wt% Aliquat 336 resin at a flowrate of 1.0 mL/min. Remaining species in column were strippedwith 6 M HNO3/0.015 M HF at a flow rate of 1.0 mL/min. These
effluents were collected on different Ta disks as 1st and 2nd
fraction, respectively, and were evaporated to dryness with hot He
gas and a halogen lamp. Both Ta disks were picked up by robot arm,
DQG Į-activity was measured by RIDER. In 2.7 M HF, observed
Į-events of 262Db-258Lr in 1st and 2nd fraction were 11 and 4,
respectively.

3B10 An overview of the most recent gas-phase experimentswith the Superheavy element Copernicium.
CHIERAN. M.1,2,3, EICHLERR.1,2, KRAUSB.1,2, MARTZS.1,2,
TÜRLERA.1,2, WITTWERY.1,2, DRESSLERR.2, PIGUETD.2,
VÖGELEA.2,
AKSENOVN.V.4,
BOZHIKOVG.A.4,
CHEPIGINV.I.4,
DMITRIEVS.N.4,
MADUMAROVS.4,
MALYSHEVO.N.4,
POPOVY.A.4,
SABEL’NIKOVA.V.4,
4
4
STEINEGGERP. ,SVIRIKHINA.I. ,VOSTOKING.K.4,－ 145 －

YEREMINA.V.4(1Univ.Bern, 2PSI, 3JAEA, 4Flerov Lab.Nucl.React.)

Bi target, 211At was purified by the dry distillation. In theextraction experiment, after shaking for 2 min – 2 h, 350 μL of boththe phases (hexane and 1 M HClO4) were precisely taken and the
distribution ratio D was calculated. The TLC analysis was also
performed for the 211At samples in distilled water. As a result, theD values of 211At into hexane increased with increasing shaking
time under the conditions without oxidizing and reducing agents.
On the other hand, 211At was not extracted into hexane under theoxidative and reductive conditions. In the TLC experiments,
different 2 peaks of 211At with around 0 and 0.9 of Rf values wereobserved. These results suggest that neutral species with low
polarity and ionic one with high polarity exist in distilled water.
209

The study of the chemical properties of Superheavy elements(SHEs) -LH HOHPHQWV ZLWK =   -represent an extreme
challenge for nuclear chemists. In fact, since SHEs experiments
can be performed only at the “one-atom-at-a-time” level, theyrequire the development of the most advanced and sophisticatedsetups. Here, an overview of the latest gas-chromatographic
experiments with copernicium (Z = 112) will be presented.

P01 Classification of radiocesium absorbability by wildmushrooms using global fallout 137Cs
TAGAMI, K.1, UCHIDA, S.1(1QST-NIRS)Radiocesium (134+137Cs) concentrations in wild mushrooms are
relatively higher than those in other wild foods according to thefood monitoring results by the Ministry of Health, Labour andWelfare. However, different radiocesium concentrations were
found among mushroom species in a certain concentration levelarea because their different habitats and growing methods, i.e.
saprobic or mycorrhizal fungi. However, radiocesium
concentration data in mushrooms obtained after the TEPCO's
Fukushima Daiichi Nuclear Power Plant (FDNPP) accident weremainly affected by the deposition levels and number of collectedmushroom species in a same deposition level areas were limited,which makes difficult to identify which mushroom species werehigh in concentration or not. In this study, we focused on the global
fallout 137Cs because the 137Cs deposition amounts in Japanesesoils did not differ much compared to the FDNPP origin 137Cs.
Using open available data sources, we calculated global fallout
137Cs fraction in wild mushrooms and the values were divided by
the total deposition level in each prefecture before the FDNPP
accident to have aggregated transfer factor (Tag). For 23 mushroom
species, we could obtain more than three Tag values per eachmushroom species and geometric mean values of Tag ranged from
1.1×10-3- 6.1×10-2 m2/kg-fresh.

P02 Extraction and thin-layer chromatography behavior of
211At obtained by dry distillation
IKEDA, T.1, TOYOSHIMA, A.2,3, KANDA, A.1, Zhang. Z1,2,
ICHIMURA, S.4, KONDO, N.1, KASAMATSU, Y.1,2,
YOSHIMURA, T.2,5 , SHINOHARA, A.1,2(1Graduate School of Sci., Osaka Univ., 2Project Res. Center for
Fundamental Sci., Grad. School of Sci., Osaka Univ., 3Advanced
Sci. Res. Center, Japan Atomic Energy Agency, 4Fac. of Sci.,
Osaka Univ., 5Radioisotope Res. Center, Osaka Univ.)
Astatine-211 (211At) attracts a lot of attention as analpha-emitting radionuclide suitable for targeted alpha therapy. In
purification of 211At after nuclear synthesis with a solid Bi target, a
dry distillation method is often utilized. However, little is known
about chemical species of 211At in finally obtained aqueous
solution after the distillation. Thus, in the present study, we studied
extraction and thin-layer chromatography (TLC) behavior of 211At,
which was obtained by the dry distillation, with and without
oxidizing and reducing agents. After the irradiation of D beam on a

P03 Development of metallofullerene separation by chemical
reduction-2
TANAKA, K.1, AKIYAMA, K.1, HABA, H.2, KUBUKI, S.2(1Tokyo Metropolitan Univ., 2RIKEN, Nishina center.)
Endohedral metallofullerene (EMF) is expected to be applied
for radiopharmaceuticals due to their encapsulation character. For
such application, radioactive EMF is necessary to have highspecific radioactivity. It is well known that the large amount ofempty fullerenes, such as C60 and C70, are produced as a by-productduring the EMF production. To obtain the radioactive EMFs withhigh specific radioactivity, it is required to develop the efficient
separation method for trace amount of EMFs from by-products
instead of the conventional HPLC separation method. Recently, wedeveloped a new separation method combining the reduction of
EMFs using an electron donor and the difference of solubility in apolar solvent between reduced EMFs and empty fullerenes. In thissession, we will report the quantitative results of this separation
method using radiotracer technique.
Radiotracer of Ce-139 was employed for the EMF production.
Produced Ce-139 EMFs were dissolved to CS2 and then added
triethylamine(TEA).
Afterthat,
acetonitrile(MeCN),
methanol(MeOH), and mixed solution of MeCN/MeOH were used
for the separation of reduced EMFs from empty fullerenes.
Gamma-ray measurement was performed for each separated
sample. HPLC analysis was also performed to investigate recovery
rate of each EMF and empty fullerene species. As the results of
Ȗ-ray measurement and HPLC analysis, the best recovery rate wasfound in the case of MeCN/MeOH

P04 Developments of time of flight prompt gamma-ray
analysis and its application
TOH, Y. 1, HUANG, M.1,2, EBIHARA, M.3, SEGAWA, M.1,
TUCHIYA, H.1, MAEDA, M.1, KIMURA, A.1, NAKAMURA,
S.1(1JAEA, 2IMP, 3TMU.)
The Accurate Neutron-Nucleus Reaction Measurement
Instrument (ANNRI) has been developed for measurements ofprompt gamma-ray analysis (PGA), nuclear cross-section data andnuclear astrophysics at BL04 of the Material and Life Science
Experimental Facility (MLF) of the Japan Proton Accelerator
Research Complex (J-PARC). Two cluster-Ge detectors and eight
coaxial-Ge detectors with BGO Compton-suppression shields was
installed at the flight length of 21.5m in ANNRI. The－ 146 －

detector-array is designed to provide high gamma ray energy
resolution and high detection efficiency. We have developed atime-of-flight prompt gamma-ray analysis (TOF-PGA) by using an
intense pulsed neutron beam. We have conducted several
experiments of standard samples to establish the dead-timecorrection method of TOF-PGA. The correction method wasverified using experimental measurements of Ni-based superalloys. Presentation will describe the detail of the experiments andnew device (neutron filter), the current status of the developments
and future prospects.

were determined, and then compared with radioactivities of plants(wormwood leaves). 137Cs deposition increased to about 10,000
Bq/m2 after the accident, from about 0.1 Bq/m2 before the event.
As a result, 137Cs inventory in soil after the accident increased by
two orders of magnitude from 100-200 Bq/m2 before the accident.
Similarly, 137Cs concentrations in plants increased by two orders ofmagnitude from 0.1-1 Bq/kg (wet) before the accident. Correlation
among radioactivities of 137Cs in evaporation residues of fallout
samples, weight of those and radioactivities of 137Cs in air werealso investigated.

P05 The determination of uranium ratios in individual
environmental particles
TOMITA, R.,ESAKA, F., MIYAMOTO, Y.
(JAEA)

P07 Study on a Determination Method of Radioactive
Antimony in Soil near Fukushima Daiichi Nuclear Power
Plant
MIYAZAWA, N.1,UESUGI, M.2, YOKOYAMA, A.3(1Graduate School of Natural Science and Technology, Kanazawa
University, 2Advanced Science Research Center, Kanazawa
University, 3Institute Science and Engineering, Kanazawa
University)

In the previous study, we developed a combination method ofparticle manipulation and secondary ion mass spectrometry(SIMS) for removing the interferences from other elements inother particles. Since the particles were selected randomly andmanipulated, it caused the problem not to cover the range of
235U/238U isotope ratio in the sample. In this study, we improved
the procedure of analyzing uranium isotope ratios in individual
particles by SIMS to cover the range of 235U/238U in the sample.
70 uranium particles in an environmental sample weremanipulated and screened by using an automated particle
measurement (APM) software of the SIMS instrument. After the
APM measurement, several uranium particles were selected tocover the range of 235U/238U and accurate uranium isotope ratios
were determined by SIMS with microprobe mode, that mode iscapable to measure more accurate isotope ratios compared with
APM measurement.
APM measurement resulted the range of 235U/238U from 0.001 to
0.053. This distribution of isotope ratio is useful information for
selecting particles to be measured by SIMS with microprobe mode.
APM measurement performed simplified measurement to know
the range of isotope ratios in the samples. In this improved
procedure, we could cover the range of 235U/238U in the sample
even if approximately 10 uranium particles were measured withmicroprobe mode

P06 The Environmental Impact of the Fukushima Dai-ichi
Nuclear Power Plant Accident on Land of Miyagi Prefecture
ISHIKAWA, Y.1, TAKAMURE, T.1, HATAKEYAMA, N.1, ARAI,Y.2, TAKAHASHI, M.1, ANDO, T.1(1Miyagi Pref. Environ. Rad. Monitoring Center, 2Miyagi Pref.
Nucl. Safety Division)
Miyagi Prefecture, adjacent to the north of Fukushima
Prefecture, has been contaminated with radioactive materials
transported by the plumes from the Fukushima Dai-ichi Nuclear
Power Plant (FDNPP) accident, occurred on March, 2011. The
Environmental Impact of the accident on Land of Miyagi
Prefecture was investigated. Radioactivities of 137Cs and otherradionuclides in airborne dusts, rain and dry fallout, surface soils,
plants as bio-indicators, and other vegetation were measured by
gamma-spectrometry using Ge-detectors. By measurement of
fallout and soils, monthly depositions and inventories of 137Cs

A large amount of radionuclides was released into theatmosphere due to the accident at Fukushima Daiichi Nuclear
Power Plant (FDNPP) in 2011 and deposited on the soil. One of theradionuclides is 125Sb (T1/2 = 2.75 y). The deposited amount of
125Sb and its distribution are possible to be useful in estimatingproduction of the nuclide, unknown phenomena such as its
chemical reactions, and its release to the environment. The
emission amount of 125Sb is relatively small and counting photon
LQ SHDN DUHD LV GLVWXUEHG E\ Ȗ - rays from abundant radioactive
cesium. The quantitative analyses are seldom reported. Therefore,
in this study, we established a quantitative method of 125Sb byremoving cesium. We studied two methods, one of which utilizes
removing Cs with ammonium phosphomolybdate adsorption andconcentrating Sb by iron co-precipitation, and the other does
removing Cs and concentrating Sb with an anion exchange resin.
The chemical recovery was examined by addition of 124Sb (T1/2 =60.3 y) tracer. Using the examined method, we succeeded inquantifying the activity of 125Sb in contaminated soil near FDNPP.

P08 Rice cultivation test for decontamination of the paddy soil
contaminated with radioactive cesium
TANIGUCHI, D.1, DEZAWA, Y.1, YANAGA, M.2, GOTO, S.3,
SERA, K.4
(1Grad. of sci., Shizuoka Univ., 2Fac. of Sci., Shizuoka Univ.,
3Takizawa Lab., JRIA., 4Cyclo. Res. Center, Iwate Medical
Univ.)The soil of many fields was contaminated with radioactive
cesium due to the accident at the Fukushima Daiichi Nuclear
Power Plant. In the present work, cultivation tests with soil
artificially contaminated with 137Cs were performed. Fifteen pots
which the contaminated soil was put in were divided into fivegroups. Stable isotope of Cs was added to two groups before
cultivation or midsummer drainage. The radioactivity of harvested
rice plant (brown rice, leaf and stem), was measured with a Ge
semiconductor detector. The highest value of radioactivity of Cs
was found in the group of pots in which stable isotope of Cs wasadded to the soil before cultivation. The second value was found in－ 147 －

the group to which Cs carrier was added before midsummer
drainage. This means that the earlier stable isotope of Cs wasadded, the higher radioactivity of brown rice was transferred to rice
plant from soil. It is also considered that the added stable Cs ionswere a competitive relationship with radioactive ions.

P09 High sensitivity analysis of airborne particulates
SHIKIMI,J.,NITTA,W.,AKIYAMA,M.,SUZUKI,K.,ISOGAI,K.
(Japan Chemical Analysis Center)In recent environmental radioactivity monitoring, 134Cs and137
Cs in airborne particulates are often undetectable because of
their low concentrations, which unables quantitative evaluation. In
this study, an ultra high volume air sampler was used to increase
the sample volume and lower the detection limits for airborne
particulates. Airborne particulates were collected by using an ultrahigh volume air sampler JL-900 manufactured by SENYA(hereafter referred to as "SNOW WHITE") in Chiba, Japan. About
60,000 m3 of air was filtered with a flow rate of 680 m3/h during
each sampling period of about 3.5 days. The airborne particulates
was collected on a filter paper and packed into a plastic container
for gamma-ray measurement by Ge semiconductor detector. This
study reported about airborne particulates which were collected
and analyzed from February 2016 to February 2017. The obtained
radioactivity concentrations of 134Cs and 137Cs were ND 㹼 0.0057
mBq/m3 and 0.0022 㹼 0.040 mBq/m3, respectively. Since SNOW
WHITE has about 20 times higher sampling capacity comparedwith a conventional low-volume air sampler, 134Cs and 137Cs weredetected in most of samples collected even for short sampling
period of 3.5 days. This also enables us to evaluate the short term
trends of radioactivity concentrations in air. However 134Cs werestill undetected in several samples, it will be necessary to take
improvements such as increase sampling volume.

P10 Air dose rate monitoring at the portable radiation
monitoring stations in Fukushima Prefecture
TANAKA, H., MIYATA, S., SATO, S., NITTA, W., ISOGAI, K.
(Japan Chemical Analysis Center)Air dose rates have been continuously monitored at the 80
portable radiation monitoring stations located around Fukushima
Dai-ichi Nuclear Power Plant. Sixty of the monitoring stations
were equipped with NaI scintillation detectors, and the rest withsilicon detectors manufactured by Fuji electric Co., Ltd. In themonitoring results measured at the 80 monitoring stations during
2012 㹼 2016, the air dose rates decreased over time due toradioactive decay of 134Cs and 137Cs. This trend was conspicuous at
the stations which had relatively higher deposition of radiocesium
and high dose rates. Short-term changes in air dose rates possibly
caused by natural radionuclides were also observed at manystations. It is well known that the rain-out and wash-out of radon
progenies can cause the increase of air dose rate near groundsurface. In this study however, decreases of air dose rate during
rainfall were often observed at many stations. This means that the
gamma-rays emitted from radiocesium deposited in soil wereshielded by water layer on the ground temporarily produced byrainfall, resulting in the decrease of air dose. The contribution of
the shielding was large enough to cancel out the increase of dose

caused by radon progenies. At most of the sites, air dose rates
conspicuously decreased due to the decontamination activities
performed around the sites.

P11 Preparation of thick 238U metallic target using sputtering
method and its irradiation test
KAJI, D.1, MORIMOTO, K1, HABA, H.1(1RIKEN, Nishina Center for Accelerator-Based Science)
We newly developed the sputtering system, which was installed
magnetron source with 1-inch size, for preparing thick 238U
metallic target. Under the condition, such as an argon-gas flow rateof 6 sccm and a pressure of 7.3 Pa inside the chamber, we checked
the sputtering rate of the metallic 238U with tuning RF-power for
sputtering. Then, we obtained the sputtering rate of 0.263 Pg/s for
70W and 0.362 Pg/s for 100W, respectively. Finally, we succeeded
to prepare the thick 238U metallic target with about 500 Pg/cm2
thickness on 3 Pm Ti-backing foil. The 238U target was utilized forstudying on production and decay properties of Cn (Z=112)
isotopes via the reaction 48Ca+238UÆ286Cn* using a new gas-filled
recoil ion separator GARIS-II.
In this report, we will give details about the preparation of thick
238U metallic target and its irradiation test.

P12 The transfer of radiocesium from paddy soil and water torice plants
DEZAWA, Y.1,TANIGUCHI, D.1, YANAGA, M.2 ,GOTOU,
S.3,SERA, K.4(1Grad. of Sci., Shizuoka Univ., 2Fac. of Sci., Shizuoka Univ.,
3
Takizawa Lab., JRIA.,
4
Cyclo. Res. Center, Iwate Medical Univ.)
The Fukushima nuclear power plant accident released a large
amount of radioactive material into the environment. The soil of
paddy field was also contaminated with radioactive cesium. So, it
is concerned that rice plants are contaminated with radiocesium
although there are no reports that radioactivity in the rice exceeded
the standard value for these several years. In the present work,
cultivation tests were performed in order to confirm whichradioactive cesium in soil or irrigation water would be transferred
to rice. At first, non-contaminated soil collected in Shizuoka-city
was artificially contaminated with 137Cs. After pouring water andraising rice plants in Wagnel pots with the contaminated soil, 134Cs
was added to water. Harvested brown rice was loaded into a U8
container and the radioactivity of 137Cs and 134Cs in the brown rice
was measured by a Ge semiconductor detector. The uptake
quantity of 134Cs in brown rice was three timeslarger than that of
137Cs. It is suggested that the radiocesium in the brown rice mainlytransferred from the water. It is also found that the uptake quantityof 134Cs added after mid-summer drainage was higher than that of
one before.

P13 Investigation on solvent extraction of astatine for
211Rn-211At generator
SHIN, Y.1, KAWASAKI, K.1, YAMADA, N.1, YOKOYAMA, A.1,
WASHIYAMA, K.1, NISHINAKA, I.2(1Kanazawa Univ., 2QST)－ 148 －

$W LV D SURPLVLQJ QXFOLGH DPRQJ YDULRXV Į-emitters for
targHWHGĮWKHUDS\,WKDVKLJKĮ- particle energy and the emission
SUREDELOLW\RIĮ-ray is about 100%. However, 211At is produced byan accelerator and the half-life of 211At is only 7.2 hour. It is too
short to deliver to remote areas from accelerator facilities. In order
to use astatine in wider ranges we develop a 211Rn-211At generator.
In the previous study, 211At produced by 211Rn decay in dodecane
solution can be back-extracted by 90% ethanol aqueous solution
with N-bromosuccinimide (NBS), while the mechanism of astatine
extraction with NBS is not known. In this study we assumed thatBr2 generated by NBS is effective for astatine back-extraction andused bromine water instead of NBS. 211At was produced in the
209Bi(Į Q  UHDFWLRQ E\ $9) F\FORWURQ DW 5,.(1 211At was
separated from Bi target by heating and collected in dodocane.
211
At was back-extracted by 90% ethanol aqueous solution with
Br2 of various concentrations. After extraction, the radioactivitiesof 211At in water phase and organic phase were measured by liquid
scintillation counter to obtain its distribution ratios. The results are
similar to those of NBS, but include the best astatine
back-extraction ratio obtained so far.
211

P14 Development of cavity ring-down spectroscopy apparatus
for chemical identification of carrier-free radioiodine andastatine in gas phase
TOYOSHIMA, A.1, AOYAGI, N.2(1Advanced Science Research Center, Japan Atomic Energy
Agency, 2Nuclear Science and Engineering Center, Japan Atomic
Energy Agency)
Carrier-free radiotracers are often utilized in lots of research
fields because of its utility based on high sensitivity of nuclear
radiation. However, it is difficult to identify their chemical forms
by standard UV/vis and IR spectroscopy because of their micro
quantities. These are deduced from behavior of the radiotracers inpartition methods such as chromatography and solvent extraction.
In the present study, we will report our status on development of anapparatus for cavity ring-down spectroscopy applied to themeasurement of carrier-free radioactive iodine and astatine in a gas
phase.

P15 Observation of Zinc Vacancy-Hydrogen Complexes in
ZnO by Means of Positron Annihilation Spectroscopy
SHIMIZU, H.1, SATO, W.1,2, MIHARA, M.3, FUJISAWA, T.1,
FUKUDA, M.3, MATSUTA, K.3(1Grad. Sch. Nat. Sci., Tech., Kanazawa Univ., 2Inst. Sci. Eng.,
Kanazawa Univ., 3Grad. Sch. Sci., Osaka Univ.)
Zinc Oxide (ZnO) is highly expected for applications tofunctional devices because of its wide band gap of 3.4 eV. ZnO
shows persistent photoconductivity, which causes the degradationof performance of devices such as thin film transistors used inliquid crystal displays. Zn vacancy-hydrogen complexes (VZn +nH) are a possible candidate as one of the cause of the degradation.
Their removal from ZnO is essential, but their thermal stability has
not been fully understood yet. In this work, positron annihilation
lifetime spectroscopy was employed for the observation of theformation and desorption processes of VZn + nH in single crystal

ZnO in relation to heat treatment at various temperatures. In orderto highlight the behavior of VZn + nH complexes, the sample was
implanted with 1H+ using an electrostatic accelerator. After the
implantation, the positron lifetime became shorter, which suggests
the implanted hydrogen atoms were captured by VZn to form thecomplexes. At 473 K, it was suggested by an increase of positron
lifetime that most of hydrogen atoms dissociate from VZn; however,the lifetime hardly changed above 573 K. In the present session,
the constant positron lifetime is discussed based oncomplementary studies for unimplated single crystal ZnO bymeans of positron annihilation lifetime spectroscopy andDoppler-broadening spectroscopy.

P16 Electronic and chemical states of iron in ancient buriedtrees revealed by 57Fe Mössbauer spectroscopy
YAMAUCHI, S.1,KURIMOTO, Y.1, SAKAI, Y.2(1Akita Pref. Univ., 2Daido Univ.)
The electronic and chemical states of Fe species in ancient trees(umoregi trees) excavated from the foothills of Mt. Chokai inJapan were characterized using 57Fe Mössbauer spectroscopy andcomplementary analytical techniques. The umoregi wood samples
were prepared from the stems of four tree species. Japanese cedar
and Japanese zelkova umoregi woods were light brown and darkgreen, respectively. Japanese oak and Japanese chestnut umoregi
woods exhibited pure black tone. Treatment with oxalic acidremoved these characteristic color tones from the umoregi woods.
Infrared photoacoustic spectra indicated that the degradation of theumoregi woods has not proceeded drastically. Mössbauer spectraof the umoregi woods were recorded at 293 K and 78 K, and theirabsorption line shapes were analyzed using a curve-fitting method.
The resulting Mössbauer parameters confirmed that Fe wastrivalent and its spin momentum number was 5/2 (i.e. high-spinstate). From this comprehensive investigation, it was suggested
that Fe3+ in Japanese oak and Japanese chestnut umoregi woods
forms multinuclear complexes.

P17 Particle size distribution of atmospheric aerosols
including 7Be and major ionic species
MATSUBARA, R. 1, HIWATASHI, M. 2, KONDO, A. 1, and
MURAMATSU, H. 1
(1Fac. of Edu., Shinshu Univ., 2Grad. Sch. of Edu., Shinshu Univ.)
It has been desired to obtain more knowledge concerning
migration, diffusion, and transport processes of airborne
radioactive materials after the Fukushima nuclear accident. In
order to estimate the chemical form of atmospheric aerosols as acarrier of radioactive materials, we have carried out themeasurement of the particle size distribution of atmosphericaerosols attached 7Be and determination of the components ofionic species contained in the atmospheric aerosols, by using a
12-stage low-pressure cascade impactor (Tokyo Dylec Co., LP-20)
and a high performance liquid chromatography (HPLC, Shimadzu).
We found that excellently dominant ionic species were SO42- andNH4+, and their mass median aerodynamic diameter (MMAD)
were 0.53-0.68 μm and 0.54-0.74 μm, respectively, which are quite
similar or almost identical to the activity median aerodynamic
diameter (AMAD) of the 7Be-aerosols, 0.44-0.67 μm. So, we－ 149 －

conclude that aerosols containing NH4+ and SO42- would be thepotential transport medium for 7Be.

P18 The evaluation of adsorption properties of metal ions on
Sr selective resins and application to analysis of Sr-90 in fishbone ash sample
MIURA, T.1, MINAI, Y.2(1NMIJ, 2Musashi Univ.)
A simple analytical method was developed for the determinationof 90Sr in fish bone ash samples. The adsorption behaviors of 26
metal ions on eichrom Sr Resin and IBC Advanced Technology
AnaLig Sr-01 resin were examined. The obtained distribution
coefficients show that Sr Resin has suitable selectivity. The
proposed method consists of co-precipitation with calcium
phosphate and purification by Sr Resin. After ingrowth, 90Y wasmeasured using a liquid scintillation counter. The proposed
method was validated by radiometric analysis of 90Sr in certified
reference materials (NIST SRM 1400 bone ash, and IAEA-156
Radionuclides in clover). Finally, the proposed method wasapplied for interlaboratory comparison of 90Sr analysis in fish bone
ash sample. The analytical results by proposed showed acceptablez score.

TcO4í

P19 Quality evaluation ofsolution from Mo
generated with accelerator induced neutrons
KAWABATA, M. 1,2, NAKAHARA, Y. 3, HATSUKAWA2, Y.,
MOTOISHI, S. 1, 2, SAEKI, H. 1, 2, OHTA, A. 1, 2, SHIINA, T. 1,
KAWAUCHI, Y. 1, HASHIMOTO, K. 2, AND NAGAI, Y. 2
(1Chiyoda Technol Corp.,2QST,3FUJI FILMRI Pharma Co., Ltd.)
99m

99

99Mo

can be produced via the 100Mo(n,2n) reaction using
accerelator generated neutrons where dauter nuclide 99mTc isthermo-chlomatographycally separated from a relatively large
sample mass of MoO3. Radiopharmaceutical quality of theobtained 99mTc pertechnetate solution was assessed to ensure thatthe production method could be an alternative to a fission
production. The result showed that the quality of the 99mTc
pertechnetate solution met the United States Pharmacopeia
requirements, hence it was compatible to commercially available
99mTc pertechnetate solution. The non-radioactive molybdenum
content, which could have been present from the 100MoO3 raw
material, was far below than a tolerance dose given in internationalguidelines. Good labelling yields were obtained for the fourradiopharmaceutical agents (MIBI, ECD, MAG3 and MDP). This
results strongly support that the production of 99Mo obtained via
the 100Mo(n,2n) reaction using accelerator induced neutrons
followed by thermo-chromatographic separation of 99mTc can be a
promising substitute for the fission product 99Mo.

P20 Influence of number of introduced molecules on
isothermal chromatography of Zr and Hf chloride
SHIRAI, K.1, GOTO, S.1, OOE, K.1, KUDO, H.2(1Grad. Sch. Sci. Tech., Niigata Univ., 2Fac. Sci., Niigata Univ.)
In a gas phase chemistry of superheavy elements, it is believedthat there is an empirical linear correlation between a standard

sublimation enthalpy and an adsorption enthalpy on quartz surface
for a volatile species of interest, and the sublimation enthalpy is
deduced from the adsorption enthalpy obtained in single-atomexperiments. Although the volatility sequence which was obtained
from the results in on-line experiments was ZrCl4 RfCl4 > HfCl4,
especially, the relation between ZrCl4 and HfCl4 differs from therelation of sublimation expected from their vapor pressure curvesin the macro-scale. In this study, we performed isothermal gas
chromatography with various number of molecules to clarify causeof the difference in behavior of adsorption.
ZrOCl2 or HfOCl2 solution of a certain concentration including
radiotracers of 88Zr or 175Hf was once transformed into oxide, after
that, the oxide was heated with CCl4 at 600 °C and turned into achloride. The formed chloride was collected on carbon filter at achloride-collection part, and then was evaporated at 400 °C. The
volatile species passed through an isothermal column at various
WHPSHUDWXUHV DQG FXPXODWLYH \LHOGV ZHUH REWDLQHG ZLWK Ȗ-ray
measurement. We applied a chromatography model that thevolatile species can adsorb on sites of two types, the original
surface and the molecular layer of the adsorbed species. In the
symposium, the difference of mechanism to pass through thecolumn between macro- and tracer-scale will be discussed in moredetail.

P21 Temporal variation of 36Cl/Cl ratio in rainwater at
Tsukuba before and after the FDNPP accident
OCHIAI, Y.1, SASA, K.1, TAKAHASHI, T.1, TOSAKI, Y.2,
MATSUMURA, M.1, ABE, S.1, HOSOYA, S.1, TAKANO, K.1,
SUEKI, K.1(1Univ. of Tsukuba, 2AIST)On March 11, 2011, a huge earthquake and the following
tsunami severely damaged the Fukushima Daiichi Nuclear Power
Plant (FDNPP). Various nuclear reaction products were
subsequently emitted from the accident (e.g. 35S). This study
focuses on 36Cl which is also expected to have been produced
inside the reactor and released into the environment. At the
University of Tsukuba, the 36Cl/Cl ratios in monthly rainwater
samples were measured with accelerator mass spectrometry(AMS). In this study, we measured the 36Cl/Cl ratios in rainwatercollected from November 2010 to December 2011, by using the
AMS system at the University of Tsukuba. As a result, it wassuggested that the ratio in March 2011 was higher than in February
2011. In the poster, we will report on detailed analysis and thecomparison with the seasonal trend of 36Cl/Cl ratios observed for2004-2009 and the variation of 129I/127I ratio during 2010-2011.

P22 Migration of radiocesium in suspended matter by rainfall
in Tamagawa River watershed
OKUMURA, S.1, SHIMONO, A.2, FUJII, K.1, OCHI, K.3,
HAGIWARA, K.2, KOIKE, Y.2(1 Grad. Sch. of Sci. and Tech., Meiji Univ., 2Sch. of Sci. and Tech.,
Meiji Univ., 3JAEA)
A large amount of radiocesium released into the atmosphere by
the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident
was deposited on urban area. The continual monitoring ofradiocesium at the river watershed is important for estimating－ 150 －

environmental impact by migration of FDNPP-derived
radiocesium through a river system. Activity concentrations ofradiocesium were determined for the suspended, dissolved andsediment samples collected at the Tamagawa River watershed.
Among the radiocesium derived from the FDNPP in river water,
radiocesium adsorbed on suspended matter decreased in the riverwatershed. High concentration of suspended radiocesium has beenreported by rainfall events because of increase of the amount ofsuspended matter. In this study, activity concentrations of 137Cs insuspended matter were observed at regular intervals from the start
to the end of rainfall.

P23 Measurement of Internal Fields in Co and Mn Co-doped ZnO
by Means of 57Co EPLVVLRQ0ऺVVEauer Spectroscopy
MORIICHI, R.1, KANO, Y.1, SATO, W.1,2(1Grad. Sch. Nat. Sci., Tech., Kanazawa Univ., 2Inst. Sci., Eng.,
Kanazawa Univ.)
We measured internal fields in 6.25 at.% Co-and 6.25 at.%Mn-co-doped ZnO (CMZO) synthesized by a solid state reaction
by means of 57Co emission Mऺssbauer spectroscopy. Two doublets
were observed in the spectrum measured at room temperature : oneis assignable to 57Fe2+ (Ћ57Co) substituting for defect-free Zn site
in ZnO lattice and the other to 57Fe3+ (Ћ57Co) in substitutional Zn
sites adjacent to a Zn vacancy. However, below 100 K, spectra
cannot be fitted only with the two doublets, and we assumed theemergence of a magnetic component. The relative intensity of thiscomponent is increased with decreasing temperature. The
temperature dependence for the 0ऺVVEDXHUSDUDPHWHUVDUHVLPLODU
to those obtained from the spectra for 5 at.% Co-and 5 at.%Mn-co-doped ZnO. In addition, we investigated the effect of
co-doping method by magnetization measurements for CMZO, 11
at.% Co-doped ZnO (CZO), and 6 at.% Mn-doped ZnO (MZO).
Unlike CZO and MZO, CMZO shows slightly different trend fromthat expected for paramagnetism. The results of 57Co emission
0ऺVVEDXHUVSHFWUDDQGPDJQHWL]DWLRQPHDVXUHPHQWVLPSO\WKDWWKH
present co-doping method can realize the emergence of dilute
magnetism in CMZO.

P24 Synthesis of Y@C60 by nuclear recoil
ITO, Y.1, AKIYAMA, K1, KUBUKI, S.1, HATSUKAWA, Y.2(1Tokyo Metropolitan Univ, 2QST.)
Endohedral metallofullerene: M@C60 is one of the mostinteresting metallofullerene species because of their symmetricstructure and chemical properties. The most interesting chemical
properties of M@C60 is the differences in the solubility to organic
solvents from other metallofullerenes such as M@C82. It is known
that M@C60 is soluble to aniline and pyridine but insoluble to good
solvent for general metallofullerene species such as toluene andCS2. In previous study, we synthesized 85Sr@C60 using the nuclear
recoil of 86Sr(n, 2n)85Sr reaction and found that the production
yield of 85Sr@C60 depend upon the particle size of Sr salts used as
the target. Here, we report the production of 88Y@C60 using thenuclear recoil of 89Y(n, 2n)88Y reaction.
As a result, the radioactivity of 88Y observed in the aniline
solutions derived from 88Y@C60 was approximately estimated to
be 4% in the total radioactivity of each sample for all aniline

solutions examined in this work and it was found that the
production yield of 88Y@C60 for each sample was almost similar inspite of different particle size. From the observed SEM image, thesimilarity in the production yield of 88Y@C60 is expected to becaused by the aggregation of Y2O3 nanoparticles.

P25 Study of the Electronic Structure of a Spin Crossover
Iron(II) Complex with Acidic Protons
N. OKAWA, T. SHIGA, H. OSHIO(Univ. of Tsukuba)Complexes that can be switched by various external fields inaddition to being triggered by deprotonation of the ligands can be
expected to be new switching materials. In this work, our aim is tocontrol the physical properties of our complex using protonation or
deprotonation of the ligands. We have synthesized a protonatediron(II) complex [FeII(H2L)2](BF4)2 (1) and a deprotonatediron(III) complex (PPh4)[FeIII(L)2] (2) using the diprotic tridentate
ligand H2L. The electronic structures of the iron ions in bothcomplexes have been determined by single crystal X-ray analysis,
magnetic and Mössbauer measurements. Single crystal X-ray
structure analysis suggested that 1 was in the Fe(II) state and theligand was protonated due to existence of two BF4- anions, whereas
2 was in the Fe(III) state and the ligand was deprotonated due toexistence of one PPh4+ cation. Magnetic susceptibility and
Mössbauer measurements revealed that 1 showed spin crossover
behavior with T1/2Ќ=150.3 K, in which incomplete spin crossover
was observed. On theother hand, 2 was in the low-spin state in all
temperature measured. We also discuss light induced excited spinstate trapping (LIESST) behavior and solution properties.

P26 A study on estimation of dissolved oxygen content inTokyo Bay using chemical states of sedimentary iron as anindicator.
KOMORI, M.1,2, SHOZUGAWA, K.1, MATSUO, M.1(1Graduate School of Arts and Sciences, The University of Tokyo,
2Yokohama Environmental Science Research Institute)
Hypoxia is a big problem particularly in inner bay such as
Tokyo Bay. To understand and solve the problem, it is important toknow when or where hypoxia occurred. However, the data of water
quality in Tokyo Bay are absolutely lacking. Therefore, we
attempted to estimate the dissolved oxygen content in Tokyo Bay
using chemical states of sedimentary iron as an indicator.
We collected sediment cores off the coast of Yokohama (flatseafloor) and Makuhari (flat seafloor and dredged trench) in Tokyo
Bay. The samples were sliced every 2 cm and analyzed for thechemical states of iron by Mössbauer Spectroscopy.
As a result of the analysis, all samples of Yokohama and thesurface layer of Makuhari tend to contain less Fe2+ and more
ferromagnetic or antiferromagnetic iron. This indicates thatseawater in Yokohama (center of Tokyo Bay) may be more oxic
than that in Makuhari (inner part of Tokyo Bay), and seawater inTokyo Bay may have been improved recently. This is consistent
with monitoring data of dissolved oxygen content in seawater.
In addition, even though sampling spots are really close,
sediment at dredged trench of Makuhari tends to contain more Fe2+
than that at flat seafloor, which indicates that dredged trench is one－ 151 －

of the causes of hypoxia.

P27 Evaluation for specific radioactivity of 67Cu for cancer
therapy, produced with accelerator neutrons by deuterons
HASHIMOTO, K.1, KAWABATA, M.1,2, SAEKI, H.1,2, SATO, S.2,
TSUKADA, K.3, SUGO Y.1, NAGAI Y.1, HATSUKAWA, Y.1,
ISHIOKA, N. S.1(1National Institutes for Quantum and Radiological Science andTechnology, 2Chiyoda Technol Corporation, 3Japan Atomic Energy
Agency,)Copper-67 is an attractive radionuclide for cancer therapy,
because of emissions of medium energy beta particle (a meanenergy of 141 keV) and gamma rays (185 keV) suitable for
imaging, and its appropriate half-life (62 hours). However, the useof 67Cu in clinical research has been limited due to the difficulty inobtaining a sufficient amount of 67Cu. We have investigated the
production of 67Cu by the 68Zn(n,x)67Cu reaction (x=n’p, d) using
fast neutrons from the natBe(d,n) reaction at the Takasaki Ion
Accelerators for Advanced Radiation Application. The separationand purification method of highly-purified 67Cu which is capable
for mouse experiments was established. In this study, the specificradioactivity of 67Cu was determined by the dependence of DOTA
concentration upon the labeling yield of 67Cu-DOTA. The
minimum DOTA concentration where the labeling efficiency is
100% is considered to be equal to the Cu concentration. The
specific radioactivity of 67Cu which is produced by irradiation of 5
g 68ZnO for 24 hours with fast neutrons from 2 mA, 40 MeV
deuterons + carbon, was estimated to be 2.1 GBq/μg Cu at EOI.

P28 Examination of the isolation method of the radioactive
microparticles in the environmental sample
TAGOMORI, H.,ISHI, Y., KANAIZUKA, S.,DOHI, T.,IIJIMA,K.
(JAEA)In order to evaluate the chemical form and distribution ofradionuclide in soil and litter near the Fukushima Daiichi Nuclear
Power Plant, method for isolating radioactive particles werecarried out. Main procedures for isolating radioactive particles are
as follows; After drying and size classification, samples aredecomposed with hydrogen peroxide. And then, IP method is
carried out to monitor the distribution of radionuclide. A portion
showing high radiation is selected as microscopic analysis which
composed of Field Emission-Electron Prove Micro-Analyzer(FE-EPMA) and Energy-Dispersive Spectroscopy (EDS).
As results of above method, several particles with uniqueelemental compositions such as Ba was identified. Moreover,methods for isolating particles of 100 - 200 um using the Micro
Manipulator were established. The isolation of fine particles (lessthan 50 um), were also applied by the meaning of digging a trenchon the carbon tape using Focused Ion Beam (FIB).

P29 Search for the vacuum ultraviolet photons from 229mTh
reacted with HF gas
YASUDA, Y.1, KASAMATSU, Y.1, SHIGEKAWA, Y.1,
TAKAMIYA, K.2, OHTSUKI, T.2, MITSUGASHIRA, T.3,

SHINOHARA, A.1(1Grad. Sch. Sci., Osaka Univ., 2Res. Reactor Inst., Kyoto Univ.,
3The Oarai-branch, Inst. Materials Res., Tohoku Univ.)
Thorium-229m has the extremely low excitation energy, 7.8 ±0.5 eV, which corresponds to the vacuum ultraviolet photon. It is
expected that the decay mode of 229mTh might change depending
on its chemical condition: the internal conversion (IC) or
gamma-ray transition. Recently, the IC electrons emitted from
229mTh neutral atoms were reported. If we could detect the photons
from 229mTh, direct observation of the change of the decay mode
would be achieved. In the present study, we performed the photon
detection for the sample prepared by reacting the highly-charged
229mTh recoil ions with HF gas.
The 233U electrodeposited sample was set in the Collection
Apparatus for Recoil Products (CARP). Thorium-229m ions werecollected in He or He/HF mixture gas atmosphere. To detect thephotons, the photomultiplier tube which detects 4-10 eV photons
was used. In the results of photon detection for the 229mTh samples
collected in the both He gas and He/HF mixture gas, the decaying
photons were observed. Because the main component of thesephotons might be induced by ȕ decays of daughter nuclides, thenewly purified 233U sample was prepared and set in CARP. In thecase of using the new 233U sample, no significant photons weredetected. Thorium-229m ions were considered not to react with HF
gas sufficiently.

P30 Determination of 125Sb and 129I in radioactive particles
derived from FDNPP
MATSUO, K.1,SUEKI, K.1,SATOU, Y.2,YOSHIKAWA, H.2,
MINOWA, H.3, SASA, K.1, MATSUNAKA, T.4, MATSUMURA,
M.1, TAKAHASHI, T.1, SAKAGUCHI, A.1(1CRiED, Univ. of Tsukuba, 2JAEA, 3The Jikei University Schoolof Medicine, 4Kanazawa Univ.)
In March 2011, radioactive particles were emitted into theenvironment from FDNPP. We wanted to presume how
radionuclides were absorbed in particles when they generated andunderstand the process of generating radioactive particles. In thiswork, we tried to determine the amount of measurable
radionuclides in these particles. We measured the radioactivity of
gamma-ray of radioactive particles by Ge semiconductor detectors
and determined the quantity of 125Sb, 134Cs and 137Cs. And, we
extracted iodine from the particles using the two experimental
procedures and quantified the amount of 129I by AMS. And then,the activity ratio of the target nuclide to 137Cs on 2011/3/11 wascalculated. The activity ratio of 134Cs to 137Cs was 0.912 ~ 0.935(Average : 0.918 s 0.008). So, these particles were from the unit 1.
And the average of activity ratio of 125Sb to 137Cs was (1.1s0.4)
10-2 and it was comparable to the estimated radioactivity ratio.
However, the activity ratio of 129I to 137Cs was (1.1 ~ 5.8)10-9(Average : 2.9 10-9) and it was smaller than the estimatedradioactivity ratio by two orders of magnitude[2]. From the results,
it was presumed that the absorbed radionuclides of particles weredifferent process at each radionuclide.

P31 Solvent extraction of Zr and Hf, lighter homologs ofrutherfordium, with 2-furoyltrifluoroacetone－ 152 －

OOE, K.1, KUSAKARI, S.2, GOTO, S.1, KUDO, H.2, HABA. H.3,
KOMORI, Y.3(1Grad. Sch. of Sci. and Tech., Niigata Univ., 2Fac. of Sci., Niigata
Univ., 3RIKEN Nishina Center)
We have been investigating solvent extraction behavior of Zr
and Hf using organic ligands such as 2-thenoyltrifluoroacetone(HTTA) for aqueous chemical studies of element 104, Rf. In theprevious study, we found that it takes about several tens of minutes
to attain extraction equilibrium of Zr and Hf with HTTA andanother extractant which shows faster kinetics is required forchemical experiments with the shirt-lived 261Rf. In this study,
2-furoyltrifluoroacetone (HFTA) was employed for solvent
extraction of trace amounts of Zr and Hf. The extraction kinetics
was investigated by a batch method and a rapid extraction
apparatus using a flow injection analysis (FIA) technique.
Radiotracers of 88Zr and 175Hf were produced using the AVF
cyclotron at RIKEN. These radiotracers were chemically separated
from target materials. Nitric acid solution containing theradiotracers and HFTA in toluene solution were used as aqueousand organic phases, respectively. In the batch extraction
experiment, the extraction equilibrium of Zr and Hf with HFTA
was attained in approximately 4 min, showing faster extraction
kinetics than HTTA. In the presentation, the results of extraction
experiments with the FIA apparatus will be also reported.

P32 The study on the method of the rapid screening analysis
for alpha and beta nuclides in foods
YAMANAKA, J.1, SHIMA, N.1, TENNICHI, Y.1, TAMARI, T.1,
MOMOSHIMA, N.1(1Kyushu Environmental Evaluation Association)
The criterion value of radioactivity in foods is specified forradioactive cesium and the activity is conventionally measured by
gamma spectrometry. However, analysis of alpha and beta nuclides
in foods is not easy. We examined the screening method for
Sr-90(Y-90), Pu and Am in foods. The nuclides were purified withD '*$ UHVLQ DQG PHDVXUHG VLPXOWDQHRXVO\ XVLQJ WKH Įȕ
discrimination function of the low background liquid scintillation
counter (LSC). The recoveries of Y-90, Pu-239+240 and Am-241
were more than 90% and almost all of disturbing elements, U, Th
and Bi were effectively removed. Moreover, the optimum
GLVFULPLQDWLRQ OHYHO RI WKH Įȕ GLVFULPLQDWLRQ IXQFWLRQ ZDVGHWHUPLQHG WR EH WKH PLQLPXP VSLOORYHU YDOXH RI Į DQG ȕ FURVV
contamination. The detection lower limits were about 20 mBq at
Y-90, and about 2 mBq at Pu-239+240 and at Am-241 for 100
minutes counting time using the optimum discrimination level.
However, the incomplete removal of Po-210 is found to affect on
the measurement in case of high Po contain samples.

P33 Reexamination of no-carrier-added purification of 28Mg
produced in the 27$O ĮS UHDFWLRQ.
KIKUNAGA, H.1, KOMORI, Y.2, HABA, H.2, SHIBATA, S.2,
YANO, S.2
(1ELPH, Tohoku Univ., 2RIKEN Nishina Center)
The isotope 28Mg is useful in biological sciences as aradioactive tracer. Generally, 28Mg is produced for each use innuclear reactions because of its short half-life of 21.6 h. The
reaction 27$O ĮS 28Mg is often chosen for the production of 28Mg
owing to its potential to produce no-carrier-added 28Mg tracer witha convenient and low-cost target. Several groups have reported
separation methods of 28Mg from Al targets based on adsorption,
co-precipitation, solvent extraction, and the cation exchange
column method. Although the cation exchange column methodshould yield a high purity tracer, it requires a large column and an
eluant volume of a few hundred milliliters. In this work, weapplied a co-precipitation method before the cation exchange
column method to downsize the column volume. Downsizing
chemistry leads to the reduction of waste and labor in separation
procedures and the quality improvement of the tracer.

P34 Molecular structure effect on muon capture processes inbenzene and cyclohexane
INAGAKI, M.1, NINOMIYA, K.1, NANBU, A.1, KUDO, T.2,
TERADA, K.1, SATO, A.1,
KAWASHIMA, Y.3, TOMONO, D.3, SHINOHARA, A.1(1Grad. Sch. Sci., Osaka Univ., 2Sch. Sci., Osaka Univ., 3RCNP,
Osaka Univ.)
Formation processes of muonic atoms are affected by thechemical environment of the muon-capturing atoms, as it is calledchemical effect. Previously, we reported that the chemical effect onmuon transfer process in benzene and cyclohexane in the gas phase
was smaller than the detection limit. In this study, we performed
muon irradiation experiment for liquid mixtures of benzene or
cyclohexane and carbon tetrachloride to examine the chemical
effect on muon transfer process in the liquid phase. The muon
irradiation experiments were performed at the MuSIC-M1 beamline of the Research Center for Nuclear Physics (RCNP) in Osaka
University. Muonic X-rays emitted after muon-capture for carbon
or chlorine atoms were measured by high purity germanium
detectors. Muon capture probabilities of carbon and chlorine atoms
were determined from muonic X-ray spectra. We found that themuon capture probabilities of carbon atoms in cyclohexane
samples were higher than that in benzene samples. This indicatesthat the muon capture probabilities of cyclohexane molecules arehigher than those of benzene molecules.

P35
Improvement of detection sensitivity forlong-lived radionuclide 36Cl for the 6 MV tandem accelerator
mass spectrometry system.
TAKANO.K1,
SASA.K1,
OHTA.Y1,
TAKAHASHI.T1,
1
1
1
HOSOYA.S , OCHIAI.Y , SUEKI.K(Univ. of Tsukuba1)
The 6 MV tandem accelerator has been working on
multi-nuclides Accelerator Mass Spectrometry (AMS) (10Be, 14C,
26Al, 36Cl, 41Ca, and 129I) at the University of Tsukuba. AMS ishighly sensitive measurement method for long-lived radionuclides.
We can determine very low isotopic ratio (10-1010-15) in thesample by AMS, nevertheless if there is a small amount of
measuring object. On the other hand, we have to care about theinterference of isobar from the sample in AMS. For example, 36S
may cause serious interference on 36Cl(t1/2 = 3.0 ×105 yr)-AMS.
36Cl
is commonly used to determine the exposure age of－ 153 －

meteorites or rocks. The record of 36Cl in the ice core has important
information on the history of cosmic ray intensity over the past
several hundred thousand years. However 36Cl concentration in
the Antarctic ice core is normally several thousand atoms g–1.
Analyses of 36Cl/Cl values by accelerator mass spectrometry are
estimated to 10–14. Therefore, we should improve the method to
remove 36S for high sensitivity 36Cl measurement for the 6 MV
tandem accelerator mass spectrometry system. In this study, we
tried to use AgBr as the backing material on sample holders. In
addition, we made several AgBr materials under the different
chemical processing conditions in order to compare the effect of
36S elimination. We got the result that there is lower counts of 36S
under acid treating AgBr material as compared with thecommercial AgBr reagent. In this presentation, we will introduce
the result on the improvement of 36Cl detection sensitivity for the 6
MV tandem accelerator mass spectrometry system.

P36 Development of a low energy atomic beam extraction
technique for the determination of the valence electronic
structure of Lawrencium (Z = 103)TOMITSUKA, T.1, 2,TOKOI, K.1, 3, SATO, T. K.1, ASAI, M.1,
TSUKADA, K.1, TOYOSHIMA, A.1, CHIERA, N. M.1,
KAMADA, H.1, 4, NAGAME, Y.1, 3, GOTO, S.2.
(1JAEA, 2Grad. Sch. of Sci. and Tech, Niigata Univ., 3Ibaraki Univ.,
4Grad. Sch. of Engin., Nagoya Univ.)
In order to determine the valence electronic configuration of
the ground state of Lawrencium (Lr, Z = 103), which is influenced
by strong relativistic effects, we have developed a technique for
production of a low energy atomic beam using a high-temperaturenozzle method. To generate an atomic beam with a high efficiency,
the generation rate and the directivity of atomic beam needs to be
improved. Here the current status of the atomic beam source will
be presented.

P37 Acceleration of analytical procedure for the Pu and Am
analysis in soil using by ammonium salt fusion and solid phaseextractions
YAMAMORI, K1, UESUGI, M2, YOKOYAMA, A3(1 Graduate School of Natural Science and Technology, Kanazawa
University, 2Advanced Science Research Center, Kanazawa
University, 3Institute of Science and Engineering, Kanazawa
University)
A rapid analysis is required to ensure safety in a nuclear
accident. Accelerated procedures of the analysis for plutonium andamericium were examined duo to the demand. The dissolution of
Pu and Am in soil was carried out by the ammonium salt fusing
method, and the purification process was performed by using
extraction disk or cartridge. In the dissolution process, Pu and Am
can be dissolved more quickly by the ammonium salt fusion thanby the nitric acid leaching. Heating at 200-250 °C for 30 minutes issufficient on a hot plate for the dissolution. The removal of organic
substance was performed by addition of potassium permanganate
solution. In the purification using a TEVA disk for Pu and using
DGA cartridge and TEVA cartridge for Am,. As a result, it wasmade possible to shorten the soil dissolution from 48 hours to 3
hours and the purification separation for Pu or Am from 12 hours

to 1 hour.

P38 Hydroxide precipitation experiment of alkaline earth
metals for experiment of Nobelium
NAGASE, M. 1, KASAMATSU, Y. 2, KONDO, N. 2, SHINOHARA,
A.2(1 Sci., Osaka Univ, 2Grad. Sch. Sci., Osaka Univ.)
Nobelium (No) belongs to actinide elements, and in the previous
study, the most stable ion valency of No in aqueous solution isreported to be +2 although those of the other heavy actinide
elements are all +3. However, the chemical experiments of No
were very few because of the low production rates and shorthalf-lives of the No isotopes. In the previous study, it was reported
that the chemical behaviors of alkaline earth metals are similar tothat of No. For the precipitation experiment of No, in this study, weinvestigated the hydroxide precipitation behaviors of alkaline earth
metals (Mg, Ca and Ba) by applying the coprecipitation methodwith Sm hydroxide. We mixed 0.10 M of alkaline earth metal
chloride in 0.20 M nitric acid and basic solutions (dil. and conc.
NH3, 0.10 M, 1.0 M, 6.0 M or 12 M NaOH), and the prepared
precipitate was filtered and separated from supernatant solution.
The metal concentration of each solution was determince bytitration with 0.010 M EDTA and the precipitation yield was
obtained. The precipitation yields of the elements increased withthe hydroxide ion concentration and the yields of heavier elements
increased at higher hydroxide ion concentrations. These tendencies
are consistent with the order of the solubility products of theseelements.

P39 Alpha-electron coincidence measurement of 233U for
detecting the internal-conversion electron of 229mTh
SHIGEKAWA, Y.1, KASAMATSU, Y.1, YASUDA, Y.1,
SHINOHARA, A.1, STELLMER, S.2, KAZAKOV, G. A.2,
ROSECKER, V.2, SCHUMM, T.2(1Grad. Sch. Sci., Osaka Univ., 2Institute for Atomic andSubatomic Physics, Vienna University of Technology)
The nuclide 229mTh has extremely low excitation energy (7.8 ±0.5 eV), which is close to the binding energy of the valence
electrons. Therefore, it is estimated that the chemical environments
affects the process of the nuclear decay of 229mTh (internalconversion (IC) or gamma-ray emission) and also its half-life. Last
year, it was reported that the IC electron originating from 229mTh
was detected for the first time and the half-life was determined to
EHDURXQGȝV+RZHYHUWKHH[FLWDWLRQHQHUJ\RI 229mTh has notbeen directly determined. In this study, we tried to detect ICelectrons from 229mTh recoiling out of 233U with the alpha-electron
coincidence measurement, and to determine the energy of the IC
electrons with the retarding-field spectrometer for determining theexcitation energy of 229mTh directly. We prepared two types of 233U
sources on the Si detector, and measured alpha particles with the Si
detector and electrons with the MCP detector placed above the 233U
source. IC electrons from 229mTh should be detected about  ȝV
after detection of alpha particles originating from 233U decay. We
were able to obtain some time spectra for the 233U sources. As
some delayed electrons were observed after alpha decay of 233U
and 232U, IC electrons from 229mTh have not yet been distinguished.

－ 154 －

P40 Dissolved State of Radon with Cluster Molecules ofSolvent
YAMADA, N. 1, SHIN, Y. 1, KAWASAKI, K. 2, YOKOYAMA, A.

[Fe(II)(CN)6] and [Fe(III)(CN)6]
NINOMIYA, K.1, KUBO, K.2, KITANAKA, M.1, TAMPO, M.3,
KAWAMURA, N.3, STRASSER, P.3, MIYAKE, Y.3,
SHINOHARA, A.1(1Grad. Sch. Sci., Osaka Univ., 2ICU, 3KEK)

3(1 Grad. Sch. Nat. Sci. Tech., Kanazawa Univ., 2, 3 Coll. and Inst.
Sci. Eng., Kanazawa Univ.,)
Radon is a noble gas and the all isotopes of radon areradioactive. A method commonly used to measure radon insolution is liquid scintillation counting. This method measuresradon extracted from a solution sample into scintillation cocktail(organic solvent). Radon dissolves well in water compared to othernoble gases. The dissolved state of radon in water, however,remains undefined. The interaction between water molecules and aradon atom is important to solve the question. In 2001, existence of(H2O)n clusters (n=8-20) in solution were proposed by atheoretical calculation. In this study, enthalpies of noble gases (Ne,Ar, Kr, Xe, Rn) confined in (H2O)20 cluster were calculated with adensity-functional-theory method and compared with standard
enthalpies of solution of noble gases. As a result, enthalpy valuesof noble gases confined in the cluster (theoretical value) and thoseof solution (measured value) decrease with an increase of theatomic numbers of noble gases. In addition, it seems thatenthalpies of solution correlate roughly with those of noble gases
confined in the cluster. These results suggest dissolving of noble
gas in water is related to the formation of cluster of watermolecules with a noble gas atom.

P41 Observation of local fields in cobalt ferrite by means of
nuclear spectroscopies
TAKENAKA, S.1, SUGIMOTO, T.1, SATO, W.1,2(1Grad. School, Nat. Sci. Tech., Kanazawa Univ., 2Inst. Sci. Eng.,
Kanazawa Univ. )In our previous work, we measured hyperfine fields inmagnetite (Fe3O4) and observed that 111In (Ѝ111Cd) atoms partly
migrate from the tetrahedral A sites to the octahedral B sites at hightemperature. For further understanding of this dynamic
phenomenon, we extended our study to another spinel ferrite,
CoxFe3-xO4, and investigated their local fields by means of
perturbed angular correlation (PAC) spectroscopy with the 111In(Ѝ111Cd) probe and Mössbauer spectroscopy with 57Co(Ѝ57Fe) probe.
As a result, two different components having hyperfine magnetic
interactions were observed in PAC spectra below TC: one exhibits
small distribution in the Larmor frequency assignable to the probe
nuclei substituting for a cation site of inner part of the grains(“core”), and the other fraction to the probe nuclei at the surface
and/or boundary of the grains (“shell”). As the cobalt
concentration x increased, the magnetic hyperfine field at 111In(Ѝ111Cd) probe in the core region decreased and its distribution width
increased. This result was compared with that obtained by the
Mössbauer measurements. In the session, the Co concentration andtemperature dependence of the PAC and Mössbauer spectra are
discussed.

P42 Chemical environmental effect on muon capture between

A muonic atom is an atomic system that has one negatively
charged muon instead of an atomic electron. In muonic atom
formation, chemical environmental effect has been known. Muon
capture probability and initial muon quantum level are strongly
influenced by the chemical environment of muon capturing atom.
In this work, we focused on the muon capture process for ironcomplexes to investigate chemical environmental effect. Muon
irradiation experiment were performed at D2-experimental area in
J-PARC/MUSE. Muonic X-rays emitted after muonic atom
formation were measured by HPGe detectors for [Fe(II)(CN)6] and[Fe(III)(CN)6] samples with incident muon momentum of 30
MeV/c. From muonic X-ray intensities, we will discuss initialstate of captured muon for K, Fe, C and N atoms for each sample.

P43 Electronic state conversions of iron complexes with
Brønsted acid and base
SAIKI, R., AKIYAMA, L., SHIGA, T., OSHIO, H.
(Univ. of Tsukuba)
The electronic state of bistable complexes can be changed byvarious external stimuli such as heat, light, and pressure. However,research on control of spin state by deprotonation is still limited. In
this work, the electronic states of a series of new mononuclear ironcomplexes with a Brønsted acid ligand H2L were investigated.
Based on deprotonation and oxidation conditions, four kinds ofbis-chelate complexes were synthesized and their magnetic andelectrochemical properties were studied. The Electronic state of
the iron ions in all complexes was determined by single crystal
XRD, magnetic, and Mössbauer measurements. [FeII(H2L)2](BF4)2and doubly deprotonated neutral complex [FeII(HL)2] show spincrossover behavior at 260 K and 350 K, respectively. Thisdifference in transition temperature originates from the change ofligand field strength by deprotonation. On the other hand, triply
deprotonated neutral complex [FeIII(L)(HL)] and fully
deprotonated {(C2H5)4N}[FeIII(L)2] contain Fe(III) in the low spinstate, suggesting further deprotonation of ligand stabilizes the highoxidation state.

P44 Ion exchange behavior of Zr, Hf, and Th with
ion-exchange fiber –Basic study for ion-exchange experimentsof Rf using ion-exchange fiber–
YOKOKITA, T.1,YANO, S.1, KOMORI, Y.1, HABA, H.1(1RIKEN)
To investigate applicability of ion-exchange fiber for
ion-exchange experiments of Rf, we performed ion-exchange
experiments of Zr, Hf (homologues of Rf), and Th (pseudohomologue of Rf) with anion- and cation-exchange fibers.
Distribution ratios (Qd) of 88Zr, 175Hf, and 234Th on theanion-exchange fiber (Nichibi, IEF-BrA-SA) and cation-exchange
fiber (Nichibi, IEF-MR-SC) were measured in 0.1–1 M H2SO4 bybatch method, and were compared with those of the－ 155 －

anion-exchange resin (Mitsubishi Chemical, MCI GEL CA08Y)
and the cation exchange resin (Mitsubishi Chemical, MCI GELCK08Y), respectively. In the anion exchange, it was found that theQd values of Zr and Hf attain to constants at the shaking times of1800 s for the anion-exchange fiber and of 10 s for the resin,
indicating that the ion-exchange reaction with the resin is shorter
than that with the fiber. In the cation exchange, we also found thatthe time required for the equilibrium with the resin is faster thanthat with the fiber. From these results, we concluded that theion-exchange fibers used in this work are unavailable for theexperiments with the short-lived 261Rf (T1/2 = 68 s). However, weobserved the fast equilibrium with the anion-exchange resin in
0.1–1 M H2SO4. This system would be applicable for theion-exchange experiments with 261Rf.

P45 Application of triple quadrupole ICP-MS(ICP-MS/MS)
to radiochemistry
SHIKAMORI, Y. 1, NAKANO, K. 1, WOODS, G. 1, LIBA, A. 1,
SAKAGUCHI, A. 2
(1Agilent Technologies 2CRiED, Univ. of Tsukuba)
Trace measurement of 237Np by conventional inductively
coupled plasma mass spectrometry is hindered by the presence ofuranium within the sample, the potential interference comes frompeak broadening (abundance sensitivity interference) of theadjacent 238U isotope. Furthermore, minor but still importantpolyatomic interferences can be present from the hydrides oflighter U isotopes – 235UH2; 235U2D; 234U1H2D.
Agilent 8900 ICP-QQQ(ICP-MS/MS) was used in this work,
which features axial acceleration across the collision reaction cellwhich gives a higher product ion yield when using reaction
chemistry within the cell.
To test the U-based interference removal, Np-237 was spiked into a
10ppm U matrix solution at ppt level. Np-237 was measured under
MS/MS conditions both on-mass and mass-shift using O2 reaction
gas to produce the NpO2 product ion.
When operating under MS/MS mode, the peak overlap iseliminated by improving abundance sensitivity from ~10-7 to<<10-10. LOD and BEC using MS/MS O2 reaction mode andmeasuring as NpO2 improved the LOD to 0.56ppq and BEC to
0.32ppq.
We will report analytical figures of merit achieved and details of
the optimized method with some of back ground data for the
optimization.

P46 Effect of dissolved ozone on adsorption-desorption
mechanisms of various types of radionuclides using tannic
acid-type organic composite adsorbent
TACHIBANA, Y.1, HASHIMOTO, S.1, OKUMURA, S.2,
NOGAMI, M.3, SUZUKI, T.1, NOMURA, M.2, KANESHIKI, T.2(1Dept. of Nuclear System Safety Engineering, Nagaoka Univ. ofTechnol., 2Lab. for Advanced Nuclear Energy, Tokyo Tech, 3Dept.
of Electric and Electronic Engineering, Kindai Univ.)

resins, named improved tannic acid-type adsorbents (ITAs). In ourpresent research, the adsorption behavior on the synthesized ITAsof manganese, cobalt, strontium, yttrium, iodine including iodide
species, and the like, which has the possibility released into ourliving environment after nuclear severe accidents, have beenstudied in several types of river water at a temperature range of278-333 K and in a wide pH range, compared with those of someresins before and after ozonation. We have already confirmed that
ITAs can strongly adsorb these species, which should be separated
completely and little negative adsorption behavior of main species
such as sodium, potassium, calcium, magnesium is observed inriver water. Moreover, the thermodynamic parameters have beenobtained and the differences of adsorption mechanisms between
the radionuclides and ITAs have been discussed. In order toevaluate the potential application of ITAs for our novel ozone
water purification system, the chromatographic experiments of theradionuclides using ITAs have also been performed in river waterat 298 K.

P47 Summary of reports on environmental radioactivity
effected from the accident at the TEPCO Fukushima Daiichi
nuclear power plant
BESSHO, K.1, MATSUMURA, H.1, MIURA, T.1, IIMOTO, T.2,
KINOSHITA, N.3, SAKAGUCHI, A.4, SUGIHARA, S.5,
TAKAMIYA, K.6, TAGAMI, K.7, NAGAO, S.8, YASUDA, K.9(1KEK, 2Univ. Tokyo, 3Shimizu Corp., 4Univ. Tsukuba, 5Kyushu
Univ., 6Kyoto Univ., 7QST-NIRS, 8Kanazawa Univ., 9JAEA)
Workshop on Environmental Radioactivity was established in2000 and has been held every year on February or March at KEK,
Tsukuba. [Host: 1) Radiation Science Center, KEK; 2)
Subcommittee on D-emitters and Environmental Radioactivity,
JNRS; Co-host: 1) Subcommittee on Health Physics andEnvironment Science, Atomic Energy Society of Japan, 2) The
Japanese Radiation Research Society, 3) Japanese Society ofRadiation Safety Management.] The proceedings with peer review
has been published after every workshop.
After the accident at the TEPCO Fukushima Daiichi nuclear
power plant occurred in 2011, a large numbers of scientific reports
related to the accident were presented in this workshop.
Researchers, technicians, local government staff, and general
citizens have participated in the workshop to exchange information
on various subjects. The organizing members of the workshop
summarized 326 reports in the workshop during 2012 to 2016 andrelated publications. The summary report was published asfollows.
KEK Report 2016-3 (ISBN978-4-9907232-9-3)
͆Summary of study on environmental radioactivity effected fromthe accident at the TEPCO Fukushima Daiichi nuclear power plantin 5 years after the accident” (in Japanese)
https://lib-extopc.kek.jp/preprints/PDF/2016/1624/1624003.pdf

We have focused the excellent adsorption ability of tannic acidfor many kinds of metal ions in aqueous solutions and havesuccessfully synthesized novel ion-exchange resins chemicallycombined with hydrolyzed tannic acid and typical anion-exchange－ 156 －

本年会・討論会の開催にあたりましては，
以下の企業，団体からご協力をいただきました。
厚く感謝申し上げます。

協賛
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長瀬ランダウア（株）
富士電機（株）
広告
Agilent（株）
北原商事（株）
サンゴバン（株）
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長瀬ランダウア（株）
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日本アドバンストテクノロジー（株）（株）日本環境調査研究所－ 165 －

$JLOHQW トリプル四重極,&306,&30606,&3444

放射性元素分析への,&30606の応用例,&30606による1Sの分析

Intensityx1040/2'SST%(&SST

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SSP 8 に1Sを標準添加した検量線

濃度と同位体情報を同時取得
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新日鐵住金株式会社 技術開発本部
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筑波大学
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各種工具

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富津営業所〒293-0012
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0439-87-5247
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栃木県芳賀郡市貝町赤羽3525-48
0285-67-0078
0285-67-0079－ 168 －

サンゴバンは、素材からプローブ・特殊用途まで、
グローバル・スタンダードな世界品質のシンチレータを皆様に提供いたします。

Sensor-Kit
MCA-BASE

Scintillation Detectors(NaI,LaBr3,BGO,Plastic,Liquid,・・)+Divider + MCA + HV are only inOne-body or Two-bodies

売れてます！

LaBr3 (Ce)FWHM=2.8% @662keV
Decay Time 16 nsec

サンゴバン株式会社

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Tel 03-3263-0559 Fax 03-5212-2196

URL

http://www.crystals.saint-gobain.com/
お問合せ yasuo.watanabe@saint-gobain.com－ 169 －

（担当

渡辺）

フィンランド国

Hidex600SL型
世界唯一のTDCR技法搭載
全自動液体シンチレーションカウンター世界初で、唯一の3本の光電子増倍管を駆使したTDCR技法により、今やRI線源を内蔵したクウェンチング補正のための外部標準線源機構は、全く不要となりました。このため、測定時間の短縮化はもちろんのこと、ケミカル
及びカラーのクウェンチングも、たった1本の補正カーブで正確、また迅速に行え、正確なBq値が得られるよ
うになりました。
更に、最新の “デジタル鉛シールド機構” の採用により、バックグラウンドを平均30％も低減でき、加えて“ルミネッセンス フリーモード機構”の使用により、ルミネッセンスを一切気にせず、測定が可能となります。また、
90
Srの測定の場合、放射平衡（10〜14日）を待たずにTDCR技法を用いてチェレンコフ測定（シンチレーターを使用しない）により、簡単にクウェンチングのモニターを行いながら、サンプル調整後、直ちに測定可能です。

今やドイツを中心に、欧米各国より“TDCR技法”がいかに優れているかに関する科学文献が60題以上も発表されています。当社のウェブサイトに現在16題掲載しております。

上記の他、従来の300SL型、そして極低レベルの環境測定（3Ｈ水で1Bq/L）ができるスーパー
低レベル液シン（300SL/SLL型）と、多サンプルも装填使用出来る600SL/SLL型もございます。

主な納入先

放射線医学総合研究所
筑波大学大学院
国立海洋研究開発機構
東京慈恵会医科大学

国立保健医療科学院
産業技術総合研究所
九州大学RIセンター
米国国立衛生研究所（NIH）－ 170 －

東京工業大学 先導原子力研究所
大阪医科大学
国際原子力機構（IAEA）
フランス原子力エネルギー庁

お悩みではありませんか？
・放射線安全管理を一元管理したい！
・校正していないサーベイメーターの測定値が 正しいか知りたい！
・施設を変更許可申請したいが業務が煩雑、代行して欲しい！
・ＰＥＴ用サイクロなど加速器施設の計算および実測の放射化評価がしたい！
・放射線施設を廃止したい！

・お米、果物、飲料水などの放射能濃度が知りたい！
・ＲＩを使用した化学実験を代行して欲しい！
・放射線に係わる業務について困った！

そのお悩みＴＮＳが解決いたします
安全設計・評価
安全設計

受託試験研究♦ 施設設計♦ 遮蔽設計♦ 安全評価♦ ＲＩ施設の許認可申請業務代行♦ 環境物質の分析、挙動解析♦ トレーサー試験♦ 解体廃棄物の物理特性試験

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分析・測定・校正サービス
各種機器販売♦ 放射能分析♦ 現地における放射線測定♦ サーベイメータの確認校正

詳しくは弊社WEBサイトまで！ http://www.tokyo-nucl.co.jp♦ 放射線管理区域の空調機器の販売♦ 放射線管理区域用機器の製造・販売

東京本社

㼀㻱㻸㻚 03（3831）7957〒110-0016 東京都台東区台東1-3-5 反町ビル7F

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㼀㻱㻸㻚 029（282）3114〒319-1112 茨城県那珂郡東海村松村字平原3129-31

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豊富なデザイン＆高品質サービス

ルミネスバッジ サービス
個人被ばく線量測定－ 172 －

富士電機 サーベイメーター・測定器 広告 A4

富士電機のサーベイメータ・測定器
富士電機では、RI施設の管理を容易に実現する放射線管理システムをはじめ、放射線管理における様々な用途に応じた測定器類を取り揃えています。

Ｘ線・γ線の線量測定
電離箱サーベイメータ

ハンディサーベイメータ

シンチレーションサーベイメータ

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NHE

NHC 7

中性子の線量測定

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中性子サーベイメータ
高感度タイプ

中性子サーベイメータ
軽量タイプ

NSN2

環境線量の定点測定

NSN3

個人被ばく測定

GMサーベイメータ

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電子式個人線量計

NHJ120NHJ2NSDシリーズ

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ホームページURL http://www.fujielectric.co.jp
お問合せ先アドレス fric-info@fujielectric.com

北海道
東北－ 173 －

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022-716-0203

東京中部

042-585-6024
052-746-1032

関西
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06-7166-7346
092-262-7844

ミリオンテクノロジーズ・キャンベラの
放射線計測システム

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（クライオパルス 5 プラス）

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ISOCSTM ：ガンマ線分析システム

InSpector1000 TM ：可搬型
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DSA-LXTM ：デジタルシグナルアナライザ

5XLBシリーズ：
低バックグラウンドα/β自動計測システム

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東京本社 TEL 03-5835-5402
大阪営業所 TEL 06-4806-5662
www.canberra.com/jp/ E-mail jp-sales@mirion.com－ 174 －

調査、分析、評価まで一連の業務を総合的にサポート
九環協

一般財団法人九州環境管理協会★業務内容★

○環境放射能分析：放射性セシウム、放射性ストロンチウム
トリチウム、プルトニウム等
放射能分析全般○調査分析：河川・海洋調査、植生・動物調査、生態系調査
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ダイオキシン類分析 等○予測解析：環境アセスメント、数値シミュレーション 等○計画設計：環境基本計画、地球温暖化防止計画 等○啓発事業：環境教育 等【本部】〒

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7(/  （調査分析部）問合せPDLO V\RXJDL#NHHDRUMS
ホームページKWWSZZZNHHDRUMS【東京事務所】〒 東京都港区虎ノ門  富田屋ビル)7(/  

－ 175 －

CTC 広告 ̲A5̲2010.01※201507 住所表記変更

U R L: http://www.c-technol.co.jp
e-mail: ctc-master@c-technol.co.jp

医療_測る守る治す_和1cA5横.indd 1

2015/11/09 13:50

日本アドバンストテクノロジー株式会社「お客様のニーズを技術で支援する」 先端科学専門技術者集団の会社です

核融合分野
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レーザー分野原子力分野
野㻌-76$関係
,7(5関係,)0,)関係等-3$5&加速器関係

-.$5(1関係

0/)関係
67)関係等

激光XⅡ関係
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+775関係等

まずはご連絡ください7(/

本社:029-283-3155

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日本アドバンストテクノロジー

－ 176 －

設計・製作㻌
工事㻌 㻌

C

M

Y

CM

MY

CY

CMY

K

－ 177 －

2017 日本放射化学会年会・第 61 回放射化学討論会
研究発表要旨集編集・発行： 2017 日本放射化学会年会・第 61 回放射化学討論会
実行委員会（委員長：末木 啓介）
事務局：

筑波大学アイソトープ環境動態研究センター〒305-8577 つくば市天王台１－１－１
E-mail: sorc61@ied.tsukuba.ac.jp

発行日：
印刷：

2017 年 9 月 1 日
松枝印刷株式会社※

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