English Abstracts

1A01 Studies on hot atom chemical behavior ofenergetic ions in solids1 (XIX) -Dependence of
implantation ion fluence on chemical behavior ofenergetic hydrogen isotopes implanted into carboncontained boron filmsOSUO, J.1, SUZUKI, S.1, KOBAYASHI, M., KURATA, R.1,
WANG, W.1, ASHIKAWA, N.2, SAGARA, A.2, OYA, Y.1,
OKUNO, K.1(1Radiosci. Res. Lab. Fac. of Sci., Shizuoka Univ., 2NIFS)
For the first wall of D-T fusion reactor, boronization has
been thought to be applied for the reduction of impurities
such as oxygen and carbon. In the fusion environment,
energetic particles including tritium would be implanted
into the boron film and trapped with various chemical
states. For the estimation of tritium retention, it is importantto understand the interaction of tritium chemical behaviors
not only with boron but also with impurities in boron film.
In this study, our attention was paid to the role of carbon on
tritium trapping processes in boron films.
A carbon–contained boron film with the carbon
concentration of 40% was prepared by the plasma CVD
apparatus, and deuterium ions (D2+) were implanted into
the film with various ion fluences. The chemical states ofcarbon and boron were evaluated by XPS and the deuterium
desorption behavior was revealed by TDS.
D2 TDS spectra showed that the desorption behavior for
samples implanted at ion fluences (0.5 -2.0)×1022 D+ m-2,
consisted of three D2 desorption stages, namely, thedesorption of deuterium bound to boron and carbon with
B-D-B, B-D and B-C-D bonds However, for the sample
implanted at ion fluences of 0.1 × 1022 D+ m-2l, only B-C-D
bond was formed. These results indicated that thedeuterium would be preferentially trapped by carbon
compared to boron.
1A02 Studies on hot atom chemical behavior ofenergetic ions in solids (XX) - Dependence of ion
fluence on deuterium retention behavior insimultaneous deuterium and carbon ions implanted
tungsten
MATSUOKA, K.1, SUZUKI, S.1, KOBAYASHI, M.1,
KURATA, R.1, WANG, W.1, ASHIKAWA, N.2, SAGARA, A.2,
YOSHIDA, N.3, OYA, Y.1, OKUNO. K.1(1Radiosci. Res. Lab. Fac. of Sci., Shizuoka Univ., 2NIFS,3Res.
Inst. for App. Mech., Kyushu Univ.)
In D-T fusion reactors, the combination usage oftungsten (W) and carbon (C) has been considered as thedivertor materials to endure the high heat flux from theplasma. Under this condition, some of C will be ionized andimplanted into W and the W-C mixed layer will be formed.
In addition, hydrogen isotopes including tritium will bealso implanted into the mixed layer, simultaneously.
Therefore, the dynamics of hydrogen isotopes during theformation of the W-C mixed layer should be elucidated forthe estimation of tritium inventory. In this study, thedependence of ion fluence on deuterium retention in thesimultaneous C+ and D2+ implanted W were investigated bymeans of TDS and XPS. The D2 TDS spectra showed that it
consited of three D2 desorption stages The peak around950 K corresponded to the desorption of deuterium trapped
as C-D bond. This peak increased in the lower fluence,
whereas that in the higher fluence, it decreased, indicatingthat the chemical sputtering of deuterium by C would
govern the deuterium retention compared to the trappingof deuterium by the C in the higher fluence.

1A03 Studies on hot atom chemical behavior ofenergetic ions in solids (XXI) -Elucidation of oxidation
temperature effect on deuterium retention in theoxide layer of stainless steelSUZUKI, M.1, SUZUKI, S.1, KOBAYASHI, M.1, KURATA,
R.1, WANG, W.1, HAYASHI, T.2, YAMANISHI, T.2, OYA, Y.1,
OKUNO, K.1(Radiosci. Res. Lab., Fac. of Sci., Shizuoka Univ.1, JAEA2)
In fusion device, it is considered that type 316 stainlesssteel (SS316) will be widely used as the vacuum chamber,cooling pipes and so on. It is known that the oxide layer
formed on the surface will affect the retention behavior ofhydrogen isotopes in SS316. In addition, the chemical
states of the oxide layer depend on the oxidation
temperatures of SS316. In this study, the effect of oxidation
temperature on the retention behavior of hydrogenisotopes was studied.
After preheating for the removal of residual oxide layer,
the samples were exposed to air for 1 hour at R.T., 473 K
and 673 K to form the oxide layers. The D2+ was implanted
into the sample at R.T. Thereafter, the deuterium desorption
and the chemical states of oxide layer were elucidated by
TDS and XPS, respectively.
The TDS results showed that the deuterium desorption
peak around 600-800 K increased as the oxidation
temperature increased.
According to the XPS
measurements, the major chemical state of the oxide layers
was the iron oxide, and the oxygen concentration and thechemical state of iron in the layer increased with increasing
the oxidation temperature. These results concluded thatthe chemical states of iron oxide would affect the deuterium
retentions in the oxide layer.
1A04 Studies on hot atom chemical behavior ofenergetic ions in solids (XXII) – Annihilation behaviorof irradiation defects generated in 14 MeV neutronirradiated lithium aluminate HAMADA, A1., SUZUKI, S1., KOBAYASHI, M1., KURATA,
R1., WANG, W1., OCHIAI, K2., KONNO, C2., OYA, Y1.,
OKUNO, K1(Radiosci. Res. Lab., Fac. of Sci., Shizuoka Univ.1, JAEA2)
In blanket systems for the D-T fusion reactor, it isconsidered that lithium ceramics are introduced to breed
tritium by the reactions of 6Li (n,α) T and 7Li (n,nʼα) T.
Lithium aluminate (LiAlO2) is one of the candidates fortritium breeding materials due to its chemical stability. In
the fusion reactors, 14 MeV neutrons were generated by
D-T fusion reaction and would impinge on tritium breeding
materials. It is expected that tritium generated in thebreeding materials would be trapped by irradiation defects
induced by 14 MeV neutron-irradiation. Therefore, it isimportant to understand the correlation between theannihilation behavior of irradiation defects and the tritium
release behavior. In this study, the annihilation kinetics ofirradiation defects in 14 MeV neutron-irradiated LiAlO2 was
elucidated by Electron Spin Resonance (ESR).
From the ESR spectra, F+-center, O--center and O2--center
were formed as irradiation defects. According to theisochronal annealing experiments, it was indicated that
F+-center and O--center were disappeared by therecombination and F-center aggregation (FA) was formedat the temperature range of 300 - 500 K. Above 500 K,
thereafter, FA and O2--center began to disappear by thedecomposition.

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1A05 A proof-of-principle experiment of EIT withgamma radiation in FePSe3 single cr ystal
NAKAJO, S1., SUZUKI, H2., NAGATA, K1.,NAKAGAMI,
K1.,MURAMATSU, H2.
(1Grad. School of Edu., Shinshu Univ., 2Fac of Edu., Shinshu
Univ.)We have already reported a proof-of-principle
experiment, demonstrating electromagnetically induced
transparency (EIT) with gamma radiation for the
Mössbauer effect using the level-crossing technique. In
this report, we will discuss a possibility of EIT on FePSe3
single crystal. We synthesized a single crystal of FePSe3
by solid phase reaction in the vacuum-shielded tube (Vycol
glass tube) including the mixture of stoichiometricamounts of Fe, P, Se at 840℃ for about 1 month. The
absorber FePSe3 is antiferromagnetic below the Néel
temperature of 107K, which means that the hyperfine field
can be varied by changing the temperature. A strong
temperature-dependent internal magnetic field parallel tothe EFG-axis in the single crystal allows for crossings in
the nuclear level structure of 57Fe. From the analyses of aseries of Mössbauer spectra taken at various temperatures,
we determine that at 27 K the states |I=3/2, m=-3/2〉and|I=3/2, m=1/2〉cross and are mixed. Two of the absorption
lines (m=-1/2 l m=-3/2) and (m=-1/2 l m=1/2) merge
into one single line. So, we can see some deficit ofabsorption in this sample.
1A06 U-238 Mössbauer spectroscopic study ofuranium oxysulfide
MASAKI, N.1, NAKADA, M.1, AKABORI, M.1, ARAI, Y.1,
NAKAMURA, A.1, SATO, N.2(1Japan Atomic Energy Agency, 2Inst. of Multidisciplinary
Research for Advanced Materials, Tohoku Univ.)
The U-238 Mössbauer effect of uranium oxysulfide,
UOS, has been investigated at various temperatures from19 K to 70 K. The γ-ray source used for U-238 Mössbauer
spectroscopy was Pu-242 dioxide with high isotope purity.
By using a pure Ge detector, the 44.9 keV U-238 Mössbauer
γ -ray is easily distinguished from the 59.5 keV γ -ray of
the Am-241 isotope, which is the daughter nucleus of theisotopic impurity Pu-241. Quadrupole splitting of the U238 nucleus in UOS is approximately 40 mm/s in thetemperature range without account of magnetic splitting.
According to neutron diffraction and magnetic susceptibility
measurements, UOS is antiferromagnetic at low
temperatures with a Neel temperature of TN = 55 K.
However, Mössbauer spectra below 55 K could be analyzed
by using only quadrupole splitting without magnetic
splitting. This result showed that the magnitude ofquadrupole splitting was much larger than that of magnetic
splitting of U nucleus in UOS.
1A07 Cr ystal structures, and 151Eu and 155Gd
Mössbauer spectra of lanthanide complexes withphosphine oxides
TAKAHASHI, M., HIRAI, Y.
(Department of Chemistry, Toho Univ.)
The lanthanide complexes having phosphine oxides
such as triphenylphosphine oxide (TPPO) andtriethylphosphine oxide (TEPO) are investigated. The
TPPO complexes Ln (tppo)4 (ClO4)3 · MeOH (A; Ln = Nd,
Eu, Gd, Dy, Yb) are isostructural and contain dodecahedral[Ln (tppo)4 (ClO4)2]+ ion having two chelating ClO4– ions.
The coordination of ClO4– in a methanol solution is alsosuggested from ESI-MS spectrum. The same structures

are also found in [Ln (tepo)4 (ClO4)2] ClO4 . (B) The nitrato
complexes contains nine-coordinate [Ln (tppo)2 (NO3)3(EtOH)] (C; Ln = Eu, Gd). The europium (III) complexesof A–C show strong emission due to 7Fn←5Do transitions.
A detail analysis of the emission spectra suggests that the
local symmetry of Eu–C is higher than those of Eu-A and
Eu-B. The same is also suggested from the 151Eu and 155Gd
Mössbauer spectra; The electric field gradient Vzz values,
calculated from the observed quadrupole coupling
constants, of Eu-A and Gd-A (3.37×1021 and 3.66×1021 Vm–2) are obviously larger than those of Eu-C and Gd-C
(2.32×1021 and 1.10×1021 V m–2).
1A08 Structural and kinetic investigations for thelabeling of biomolecules with the {TcO3}-core
Y. Tooyama, H. Braband and Roger Alberto(Institute of Inorganic Chemistry, University of Zürich.)
The reactions of the [Tc (VII) O3] complexes with thealkenes give corresponding Tc (V) glycolate complexes.
Theses complexes are fully characterized by the 1H-NMR,
IR and X-ray analysis. The reaction mechanism was
kinetically investigated by following UV-Vis spectrum.
1A09 Accelerator Mass Spectrometr y and isotope
system in earth environment
MATSUZAKI, H.
(School of Eng., Univ. of Tokyo)
AMS (Accelerator Mass Spectrometry) is an extremely
high sensitive mass spectrometry and advantageous
especially in detection of long-lived radioisotopes such as
10
Be, 14C, 26Al, 36Cl, 129I. Most important source of theseisotopes is the interaction between cosmic ray and thematerials on the earth surface. CRNs (Cosmogenic Radio
Nuclides) produced in the atmosphere (which are called“meteoric” CRNs) are carried by the material circulationand distributed to every site on the earth surface anddeposited. The production rate of the CRNs depends on
primarily the cosmic ray intensity which is in turn affectedby the geomagnetic field intensity and the solar activity.
The solar activity and the geomagnetic field should bestrongly related to the global climate and environment. So
we can investigate the history of the palaeo environment
by analyzing CRNs in the natural archives such as treerings, corals, speleothems sediments and ice cores. Suchpalaeo environmental study is one of important application
field of AMS as well as radiocarbon dating.
Recently, in situ CRNs (which are produced by cosmic
ray directly in the earth surface rocks) are analyzed for theinvestigation of the earth surface process.
The
concentrations of in situ CRNs, typically 10Be and 26Al in thequartz, tell us the surface exposure age or the erosion rateof the surface. These data are used not only for the local
history of the surface morphology but also for the key
information for the regional climate condition.
14
C, 36Cl and 129I are also produced anthropogenic
processes such as the nuclear weapons testing and thenuclear fuel reprocessing. These nuclides are also potential
new tracers for the material dynamics study. Today 129I, forexample, concentration level in the earth surface
environment has been raised up to several orders higher
by the anthropogenic origin. And 129I distribution is fairly
different from region to region according to the surface
condition and the iodine dynamics in the environment.
Elemental iodine is associated with the organic materials.
Thus 129I can be not only a good proxy for the elemental
iodine dynamics but also the potential clue to reveal a new− 137 −

aspect of the carbon dynamics.
1A10 Accelerator mass spectrometr y of 36Cl andits applications
SASA, K.
(Tandem Accel. Complex, Univ. Tsukuba)
Cosmogenic 36Cl is a long-lived radionuclide with a halflife of 301 kyr. It is mainly produced in the stratospherethrough spallation of 40Ar by energetic primary andsecondary cosmic rays. The global mean production rateof 36Cl has been estimated to be ~20 atoms m−2 s−1. Natural36
Cl is transported in about 2 years from the upper
atmosphere to the ground and is accumulated in terrestrial
deposits. The 36S isobar is the principal challenge
confronting AMS measurement of 36Cl. Due to the effective
separation between 36Cl and 36S, the higher energies
available from the large tandem accelerators are requiredfor 36Cl-AMS. 36Cl is measured routinely several laboratories
using the large tandem accelerator. 36Cl is effectively used
as a monitoring tool for earth and environmental sciences.
Especially, 36Cl is the principal AMS isotope used inhydrology. A large excess of 36Cl in the atmosphere wasproduced by nuclear weapons testing in the 1950ʼs. Thisbomb pulse has proved to be a useful tracer for modern
water movement. In this presentation, I will introduce thestatus of 36Cl-AMS, and its applications for earth andenvironmental sciences.
1A11 Analysis of I-129 and its application toenvironmental sciences and geochemistr y
MURAMATSU, Y.1, ITO, E., TOYAMA, C.1, MATSUZAKI,
H.2(1Faculty of Science, Gakushuin Univ.1, MALT, Univ. ofTokyo2)Analytical procedures in the determination of iodine-129(half-life: 1.6x107 y) in environmental materials (e.g. soil,
underground brine, rain and seawater) have been studied
using accelerator mass spectrometry (AMS). For solid
samples, iodine was volatilized by pyrohydrolysis at 1000℃
and collected in an alkaline trap solution. Iodine waspurified from the matrix by solvent extraction. For brine
samples with high iodine concentrations, samples weredirectly processed by solvent extraction to purify iodine.
Finally, the obtained iodine fractions were precipitated as
silver iodide to make targets for AMS at MALT. We havealso analyzed stable iodine (127I) concentrations in thesamples by ICP-MS. We could determine the 129I/127I ratios
down to 1x10-13 in brine samples. The detection limit forsoil sample (1 g material) by the present method was about
0.01 mBq/kg or 1x10-11 as the ratio of stable iodine (129I/127I
ratio), i.e. this value was at least 2 orders of magnitude
better than that by neutron activation analysis.
1A12 Archaeology and 14C: present status and issues
IMAMURA, M.1, SAKAMOTO, M.1, OZAKI, H.2, MIYATA,
Y.3(1National Museum of Japanese History, National Institutefor Humanities, 2Paleo Labo Inc., 3Center for ChronologicalResearch, Nagoya Univ.)
Recent advance in 14C accelerator mass spectrometry
has greatly improved its performances, enabling routine
14
C measurements of a few thousands samples per year at
the precision levels of 0.2~0.4 % using a small accelerator.
This, along with the calibration techniques using theuniversal atmospheric 14C dataset, has made radiocarbon
dating much more powerful tool in archaeologicalapplications than we saw before 2000. In this paper authors
review the present status in methods of precision dating
and the outcome of some 14C applications mostly based on
our research practices performed in the last several years.
The related issues are also discussed on problems such as
sample selection and calibration, in prospect of future
improvements. Particularly, the 14C regional effects withorders of 0.5% or more found by our group in Japanesewood poses the necessity of detailed calibration data forthe region of interest. The phenomena are seemingly
correlated with the climatic change, and may provide aninteresting information if compared with other climate
proxies.
1A13 Correlation between the concentrations ofcosmogenic Be isotopes in atmosphere and solar
activities.
YAMAGATA, T.1, NARAZAKI, Y.2, IKEDA,Y.3, H. NAGAI,
H.3, MATSUZAKI, H.4(1Grad. School of Integ. Basic Sci., Nihon Univ., 2Fukuoka
Inst. of Health and Environ. Sci., 3College of Human. andSci., Nihon Univ., Sch. of Engin., Univ. of Tokyo)
The concentrations of 7Be and 10Be were investigatedat Dazaifu, Fukuoka (1998-2002), Hachijo-Island (20022005) and Tokyo (2002-2008) during 1998 to 2008. The
seasonal variations were same each year; highconcentrations and high isotopic ratios of 10Be/7Be thatwas caused by strong stratosphere-troposphere exchange(STE) were appeared in February to June, and various
concentrations but constant 10Be/7Be by verticalconvection in troposphere were appeared in July to
December. The concentrations were reconstructed by thebox model formula. The parameters of the mean residence
time and STE intensities, and period, were constant. The
amplitudes of production rate were higher than theamplitude of cosmic ray neutron flux observed at Moscow
near earthʼs surface by a factor of 4. Since the neutron flux
amplitude at polar region that was little influenced bygeomagnetic field was only 10% higher than Moscow, thehigh amplitudes of production rate were assumed thatcaused by changing of energy spectrum of galactic cosmic
ray.
1A14 Isotope ratios of 36Cl/Cl in soils by AMSTAMARI, M.1, SUEKI, K.1, AMANO, T.1, SASA, K.1,
TAKAHASHI, T.2, MATSUSHI, Y.3, TOSAKI, Y.2, OKI, T.2,
NAGASHIMA, Y.2, KINOSHITA, T.2, MATSUMURA, H.4,
BESSHO, K.4(1Grad. School of Pure and Applied Sci., Univ. of Tsukuba,
2
AMS Group, Univ. of Tsukuba, 3Micro Anal. Labo., Tandem
Accel., the Univ. of Tokyo, 4High Ener. Accel. Res.
Organ.)We measured 36Cl/Cl ratios of soil samples collected at
the equal-latitude cross-sectional areas (37°20ʼ N - 37°30ʼ
N) in Japan. 36Cl/Cl depth profiles were also obtained forthree sites. We developed an improved leaching processthat uses diluted HNO3 as an extractant, activated carbon
to remove organic matters without decomposition, andH2O2 to remove residual organic matters. This sequential
treatment allows us to measure selectively 36Cl/Cl ratios of
inorganic chlorine in soil. The isotope ratios 36Cl/Cl of soil
samplesweredeterminedbyacceleratormassspectrometry(AMS) at the Tandem accelerator, University of Tsukuba.
We have collected 27 surface soil samples from 6 sites atthe equal-latitude cross-sectional areas. The measured
36
Cl/Cl ratios of these samples were between 0.1 x 10-13 and− 138 −

3.7 x 10-13. Surface soil 36Cl/Cl depth profiles measured at
KK-12 and AB-1 are shown in Figure. The depth profiles
showed that the 36Cl/Cl ratio value had higher peak at ashallow point (between 0 - 15cm). The 36Cl/Cl ratio of AB-1
(peak value was 3.7 x 10-13) was two times of KK-12 (peakvalue was 2 x 10-13). In the KK-12 from 15 to 100 cm depth,
the 36Cl/Cl ratios drop to become observed 36Cl/Cl ratio insnow at KK site and predicted 36Cl/Cl ratio. But, in theAB-1 below 30 cm depth, the 36Cl/Cl ratios were flat at 1 x
10-13 and were three - four times of predicted value.
1A15 The distribution of 129I in the Japan Basinand Yamato BasinSUZUKI, T.1, MINAKAWA, M.2, TOGAWA, O.1(1Research Group for Environmental Science, JAEA,
2Radioecology Section, NRIFS)
Because of the results form the decrease of dissolved
oxygen and increase of seawater temperature, the Japan
Sea is known as a sensitive ocean for global warming. To
investigate water circulation in the Japan Sea bottom water(JSBW), 129I and 14C in seawater samples were measuredby accelerator mass spectrometry at the Aomori Researchand Development Center, Japan Atomic Energy Agency.
The 129I/127I ratios at the JSBW in the Japan Basin and
Yamato Basin were (6.7±0.1)×10-12 and (9.2±0.1)×10-12,
respectively. The difference of the ratio between twobasins would result from the concentration of 129I in surface
seawater when the JSBW was formed by winter convection.
Therefore, we concluded that 129I would be one of the mostuseful tracers to investigate the oceanic circulation in theJapan Sea.
1A16 Production rate of 36Cl in chondritic
meteorites (II)HAMANAKA, Y.1, OURA, Y.1, EBIHARA, M.1, SASA, K.2,
NAGASHIMA, Y.2, TAKAHASHI, T.2, TOSAKI, Y.2,
MATSUSHI, Y.3, TAMARI, M.2, AMANO,T.2, SUEKI,K.2,
BESSHO, K.4, KINOSHITA, N.2(1Grad. School of Sci. Eng., Tokyo Metropolitan Univ.,
2
AMS Group, Univ. of Tsukuba, 3School Eng. Univ. ofTokyo, 4KEK)36
Cl (T1/2 = 3.01 × 105 y) is a one of the cosmogenic
nuclides, and produced by cosmic ray induced reaction
such as spallation reaction and neutron capture reaction of35
Cl. Excitation functions of 36Cl production by protoninduced spallation reaction are characteristic for target
elements. Thus, elemental production rates of 36Cl should
provide additional cosmochemical information on radiation
history. We tried to estimate experimentally an elemental
production rate of 36Cl by spallation reactions as well as
neutron capture reaction in two chondritic meteorites.
Elemental concentrations and 36Cl concentration in a bulk
sample and 5 separated phases from two fragments of Gold
Basin meteorite and a fragment of Gao meteorite were
determined by 3 kinds of activation analysis and accelerated
mass spectrometry, respectively. For all fragments, silicate
phases dissolved in HNO3 had highest both 36Cl
concentration and Cl elemental concentration among 5
phases. It suggests that the contribution of Cl to 36Cl islarge. The production rates of 36Cl for main target element
groups, Cl, (K + Ca) and (Fe + Ni), were calculated from36
Cl and target elemental concentrations for each fragment.
Obtained production rates in this study were nearlyconsistent with those from model calculation by Welten etal. Our way for estimation of production rates is proved tobe reasonable.

1A17 AMS measurement of p-nuclei Sm-146
KINOSHITA, N1., PAUL, M2., FERINBERG, G2., NASSAR,
H2., COLLON, P3., KASHIV, Y3., ROBERTSON, D3.,
SCHMITT, C3., TANG, X.D3., DEIBEL, C4., DIGIOVINE,
B4., GREENE, J.P4., HENDERSON, D.J4., JIANG, C.L4.,
KAY, B4., LEE, H.Y4., MARLEY, S.T4., PARDO, R.C4.,
PATEL, N4., REHM, K.E4., SCOTT, R4., VONDRASEK, R4.,NOTANI, M4., FIGUEIRA, J.M5., GORIELY, S6., JISONNA,
L7., AMAKAWA, H8., TAKAHASHI, N9., MITSUGASHIRA,
T10., OHTSUKI, T11., HIROSE, K11., NAKANISHI, T12.,
YOKOYAMA, A12.
(1Accelerator Complex, Univ. of Tsukuba, 2Hebrew Univ.,
3
Univ. of Notre Dame, 4ANL, 5Tandar Lab., 6Univ. Libre deBruxelles, 7Northwestern Univ., 8Ocean Res. Inst., Univ. ofTokyo, 9Grad. School of Sci., Osaka Univ., 10Inst. ofMultidiciplinary Res. for Advanced Materials, Tohoku
Univ., 11Lab of Nucl. Sci., Tohoku Univ., 12Inst. of Sci. andEng., Kanazawa Univ.)
The 146Sm nuclide belongs to the small family of nuclides
produced by p-process of nucleosynthesis. Its presence inthe early Solar System was established by the study of
isotopic anomalies of its α-daughter, 142Nd, in meteorites.
What is very interesting is a difference in the 142Nd isotopic
signatures between terrestrial and chondritic materials,
leading to a new insight in the chronology of planetary
formation. We have developed a method for the 146Sm
detection by positive-ion high-energy accelerator mass
spectrometry (AMS) with a gas-filled magnet for theisobaric 146Sm-146Nd separation at the Argonne ATLAS
facility. The 146Sm samples were produced in (γ, n), (n,2n) and (p, 2nε) activations of enriched 147Sm targets. A
new determination of the 146Sm half-life in progress is basedon both measurements of the α activity ratios of 146Sm/
147
Sm in the 146Sm samples and the 146Sm/147Sm atomic
ratios of the same samples by AMS. Special attention is
given to determination of the latter ratios in the present
study.
1A18 On Possibility of Standardization of Analysis
Method of “Bio-Degree” of the Biomass-based
Materials
K. OHSHIMA1., T. KIMURA2, K. KOSHIISHI1(1Bioindustry Development, Japan Bioindustry Association,
2
Division of Bioresources and Product Science, Grad.
School of Agriculture Research, Faculty of Agriculture,
Hokkaido Univ.)
Possibility of the standardization on analysis method of“Bio-Degree”, content of the component derived from thebiomass in materials, based on the measurement of content
of 14C by AMSa) and LSCb), was experimentallyinvestigated.
The “Bio-Degree” of about 30 materials derived fromvarious type of the biomass was measured and comparedwith the theoretical content. For the biofuels, that are bioethanol or bio-ETBEc) containing gasoline or BDFd), direct
LSC method, counting directly the 14C scintillation fromthe specimen without the material conversion, different
from Method Ae) or Cf) of ASTM D6866, was seemed to beavailable for the standardization, whereas for solid materials
like as bio-based polymers, Method Be) of ASTM D6866 or
its advanced preparation method, where graphite is formed
as specimen for AMS, was most reasonable for the
standardization. Based on these positive results, mostbasic standardization conditions for JIS/ISO registrationon the direct method of LSC for the biofuels are now
investigated in Japan Standard Associationʼs programs.

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(*a) AMS:Accelerated Mass Spectroscopy(*b) LSC:Liquid Scintillation Counting(*c) ETBE: Ethyl Tertiary-Butyl Ether(*d) BDF:Bio-Diesel Fuels(*e) Method A/B of ASTM D6866:Sample is converted to
CO2 for LSC/AMS measurement(*f) Method C of ASTM D6866: Sample is converted to
C6H6 for LSC measurement
1B01 Application of the rapid α source preparation
method, samarium hydroxide coprecipitation
method, to superheavy element chemistr y
KASAMATSU, Y., HABA, H., EZAKI, Y.
(Nishina Center, RIKEN)
We established a rapid preparation method of samariumhydroxide coprecipitation samples using multitracer. The
multitracer was produced by the nuclear spallation reactionof Ta and transported from the irradiation chamber to thechemistry laboratory by a He/KCl gas-jet system. By thepresent method, we were able to rapidly prepare theprecipitate samples with high energy resolution in the αspectrometry. Furthermore, different chemical yields ofmany elements depending on their own chemical properties
were also obtained. These results indicate that unknown
precipitation properties of short-lived superheavy elements
would be investigated by the present method. For theinvestigation of the hydroxide precipitation of element-104
Rf (half-life: 68 s), we also studied hydroxide coprecipitation
behavior of Hf and Zr which are the homologues of Rf withradiotracers of 88Zr and 175Hf.
1B02 On-line isothermal gas chromatographic
behavior of group 5 elements Nb and Ta as
homologues of Db
SATO, T. K.1, TSUKADA, K.1 , ASAI, M.1 , TOYOSHIMA,
A.1 , KASAMATSU, Y.2 , LI, Z.1 , SATO, N.1 , KIKUCHI, T.1 ,NAGAME, Y.1(1Japan Atomic Energy Agency, 2Nishina Center for
Accelerator Based Science, RIKEN)
To investigate chemical properties of the transactinide
element dubnium (Db, Z=105), we have developed an online isothermal gas chromatographic apparatus. The online experiments with the group-5 elements using the short
lived 88Nb and 170Ta as the homologues of Db wereconducted. We measured the relative chemical yields ofvolatile compounds of 88Nb and 170Ta as a function of theisothermal temperature in chlorinating condition with
mixture of air and the SOCl2 vapor. It was found that thevolatility of compounds of Ta is lower than that of Nb.
1B03 Research on transportation of chemicalcompounds after gas phase chemistr y
MURAYAMA, H.1,GOTO, S.1, KUDO, H.1,TUKADA, K.2,
ASAI, M.2,TOYOSIMA, A.2, SATO, T.2,NAGAME, Y.2(1Fac.of Sci.,Niigata Univ., 2JAEA.)
A gas-phase chemical separation method is one of themost useful techniques to investigate chemical properties
of super heavy elements, which examines behavior ofadsorption and desorption of volatile compounds on acolumn surface. Our group has performed the gas-phase
experiments for chlorides of group-4 elements (Zr,Hf,and
Rf).
Because the super heavy elements such as
rutherfordium are mostly short-lived nuclides and alphaemitters, they have to be re-transported quickly andefficiently to an alpha detection site after passing throughthe column. However, there are few reports about theconditions of re-transportation for the volatile compoundsof super heavy elements. In this study, we constructed anapparatus for re-transportation of volatile compounds andsearched optimum the re-transportation conditions.
The experiments were performed using fission products
from 252Cf. The re-transportation efficiency for the volatilecompounds of 101Tc,104Tc, and 107Rh which were observed
clearly at gamma spectrum reached about 40%, when
KCl aerosol and N2 carrier gas were used. The detailed
results, for example dependences on kinds of carrier gas,an aerosol, and so on, will be reported.
1B04 Application of laser ionization mass
spectroscopy for gas phase chemistr y
SHIGENO, Y. 1 GOTO, S.2 KUDO, H,3(1Graduate School of Science and Technology, Niigata
Univ., 2Center for Instrumental Analysis Niigata Univ.,
3
Department of Chemistry, Faculty of Science, Niigata
Univ.)In order to study chemical properties of transactinoid
elements it is necessary to apply a rapid chemistry such asa gas phase chemistry. The gas phase chemistry is basedon volatility of complexes of the objective elements. At apreliminary experiment, it was found that several elements
showed a volatility as dipyvaloylmethane (DPM)
complexes. However, their chemical forms have not been
made clear yet. Therefore, the mass spectrometer has
been used for elucidation of their chemical forms. There
are two requirements for an ionization of mass spectroscopy.
First requirement is that nondestructive molecular ion
peak showed be observed and the second is high-selectivity.
One of he ionization method to satisfy these requirements
is Resonance Enhanced Multi-Photon Ionization (REMPI)
method.
In order to clarify species of ions generated with REMPI
the ion source of commercial mass spectrometer was
modified. In the mass spectrometry of DPM with REMPI,
intense m/z= 57 and 127 (these are the fragment ions ofDPM) were observed. The dependence of the intensity ofvarious ion on laser wavelength and power will bereported.
1B05 Anion-exchange behavior of element-105 Db
in HF/HNO3 mixed solution
KASAMATSU, Y.1,2, TOYOSHIMA, A.1, ASAI, M.1,
TSUKADA, K.1, LI, Z.1, ISHII, Y.1, SATO, T. K.1, NISHINAKA,
I.1, KIKUCHI, T.1, HABA, H.2, KUDOU, Y.2, SATO, N.1,2,
OURA, Y.3, AKIYAMA, K.3, OOE, K.4, FUJISAWA, H.4,
SHINOHARA, A.4, GOTO, S.5, KUDO, H.5, ARAKI, M.6,
NISHIKAWA, M.6, YOKOYAMA, A.7, NAGAME, Y.1(1Advanced Sci. Res. Center, JAEA, 2Nishina Center,
RIKEN, 3Grad. School of Sci. and Eng., Tokyo Metropolitan
Univ., 4Grad. School of Sci., Osaka Univ., 5Fac. Sci., Niigata
Univ., 6Grad. School of Nat. Sci. and Tech., Kanazawa Univ.,
7Inst. Sci. and Eng., Kanazawa Univ.)
Dubnium-262 was produced in the 248Cm (19F, 5n) 262Db
reaction at the JAEA tandem accelerator. The reaction
products were rapidly transported by a He/KF gas-jet
system to the chemistry laboratory and the anion-exchange
behavior of Db in HF/HNO3 solution was investigated witha newly developed on-line ion-exchange and α-particle
detection apparatus. It was found that distribution
coefficients of Db were clearly smaller than those of Ta,
the closest homologue in the periodic table, and were close
to those of the lighter homologue Nb and also the pseudohomologue Pa. From the present results, the fluoro− 140 −

complex formation of Db will be discussed in theconference.
1B06 Study on the reversed phase chromatography
with TTA or TIOA extractant for chemistr y of Element
104, rutherfordium (Rf)
ARAKI, M.,1 TAKEDA, Y.,2 NANRI, T.,1 YOKOYAMA, A.3(Grad. School Nat. Sci. Tech., Kanazawa Univ.,1 Fac. Sci.
Kanazawa Univ.,2 Inst. Sci. Eng., Kanazawa Univ.3)
In order to investigate a chemical property of Rf, atransactinide of group 4, we prepared resin containing
TIOA extractant or TTA extractant for reversed-phase
chromatography, and studied solvent extraction behaviors
of its homologues, Zr and Hf with the resins to confirm
whether they can be applied for the Rf experiment. The
batch extraction experiment was performed to measure
the distribution ratios (D) by using tracers of 88Zr and 175Hf.
The off-line column experiment was performed with amacro-size column, a micro-column, and teflon tube.
Measured D values with the column method with macrosize columns agree with those by the batch method. In the
micro-column experiment, obtained percent adsorptions
reflect the D values by the batch method, but the D values
cannot be determined from the experiment due toincomplete equilibration. We need to explore the conditions
which increase the rate of reaction and / or theoreticalmethods leading to determination of D values under theconditions.
1B07 Extraction behavior of molybdenum ashomologue of element 106, seaborgium
OOE, K.1, YAHAGI, W.1, KOMORI, Y.1, FUJISAWA, H.1,
TAKAYAMA, R.1, KIKUNAGA, H.1, YOSHIMURA, T.1,
TAKAHASHI, N.1, HABA, H.2, KUDOU, Y.2, EZAKI, Y.2,
TAKAHISA, K.3, SHINOHARA, A.1(1Graduate School of Science, Osaka University, 2Nishina
Center for Accelerator-Based Science, RIKEN, 3ResearchCenter for Nuclear Physics, Osaka University)
Last year, we reported the extraction behavior oftungsten as a homologue of element 106, seaborgium (Sg).
In this work, the extraction behavior of molybdenum (Mo),which is also the lighter homologue of Sg, was investigatedwith the same extraction system. A carrier-free isotope,
90
Mo (T1/2 = 5.7 h), was produced in the natGe (22Ne, xn)90Mo
reactions using the RIKEN K70 AVF cyclotron. Reaction
products recoiling out of the target were transported by a
He/KCl gas-jet method to a chemistry laboratory. The
transported products were dissolved in 0.1–11 Mhydrochloric acid. Equal volume of 0.05 M
tetraphenylarsonium chloride (TPAC)-chloroform or 0.05
M Aliquat 336-chloroform solution was mixed with theaqueous phase. The mixture was shaken for 3–15 min.
The two phases were taken into separate polypropylene
tubes, and were subjected to γ-ray spectrometry using Ge
detectors. The distribution ratio (D) of Mo increases withan increase of HCl concentration, indicating that theanionic chloride complex of Mo is formed. The dependenceof the D values of Mo and W on the concentration of
extractant (Aliquat 336) was also investigated to examine
the extracted species. The results indicate that the net
charge of the Mo and W chloride complexes are -1.

1B08 Reduction of element 101, mendelevium,with flow electrolytic column chromatography
TOYOSHIMA, A.1, TSUKADA, K.1, ASAI, M.1, SATO, T.
K.1, LI, Z. J.1, SATO, N.1, KIKUCHI, T.1, KITATSUJI, Y.1,
NAGAME, Y.1, OOE, K.2, SHINOHARA, A.2, KASAMATSU,
Y.2, HABA, H.2(1Japan Atomic Energy Agency, 2Grad. School of Sci.,
Osaka Univ., 3Nishina Center for Accelerator Based
Science, RIKEN)Reduction of element 101, mendelevium (Md), wasstudiedwithflow
electrolytic
chromatography.
Mendelevium-255 with a half-life of 27 min was produced in
the 248Cm (11B, 4n) reaction at the JAEA tandem accelerator.
Reaction products transported by a KCl/He gas-jet method
to the chemistry laboratory were collected on a chemistry
apparatus.
After removing KCl with HDEHP
chromatography, elution behavior of Md in 0.1 M HCl wasinvestigated with a flow electrolytic column apparatus at
the applied potentials between 0 ~ -0.9 V vs. a Ag/AgCl
reference electrode. Elution behavior of Md was the sameas that of 250Bk3+ at 0 V, showing that the stable Md3+ was
not reduced to the divalent state. At -0.9 V, elution of Md
was quite similar to that of Sr2+, demonstrating that Md3+
was successfully reduced to Md2+.
1B09 Actinides extraction and complexation
properties of new oxygen-nitrogen hetero donor
ligand PTA
KOBAYASHI, T., SUZUKI, S., IKEDA-OHNO, A.,
SHIWAKU, H., OKAMOTO, Y., AKUTSU, K., YAITA, T.
(Quantum Beam Science Directorate, Japan Atomic
Energy Agency)
The development of actinides recognition compound isof increasing importance because it concerns separation
techniques in nuclear fuel cycle and/or decontamination ofradioactive waste. In particular, the separation of trivalentactinides (An3+) from trivalent lanthanides (Ln3+) is very
difficult task due to their chemical similarity. In recent
years, the effective An3+/Ln3+ separations were observed
for some aza-aromatic nitrogen donor ligands. However,most nitrogen ligands are not effective in acidic condition
due to protonation of nitrogen atoms. On the other hand,
hard oxygen donor ligands, which do not concern inprotonation, generally show high extractabilities for both
An3+ and Ln3+ even in acidic condition.
To develop the An3+/Ln3+ separation reagent, whichallows high extractability in acidic condition, thecombination of both nitrogen and oxygen donors has been
proposed. Bearing this in mind, we have developed novel
oxygen-nitrogen hetero donor ligand, N-alkyl-N-phenyl1,10-phenanthroline-2-carboxamide (PTA), showing highextractability and selectivity for Am3+ over Eu3+ even in theacid condition. Thus, in this study, we investigated thecomplexation equilibria and structural character of the
PTA complex by UV/vis spectroscopy, X-ray absorption
fine structure, and X-ray crystallography.
In thispresentation, complexation properties and effect of oxygen
donor will be discussed based on equilibrium and structural
aspects.
1B10 Selective Adsorption of Trivalent Actinides to
Activated Carbon
ARISAKA, M., WATANABE, M., KIMURA, T.
(Nuclear Science and Engineering Directorate, Japan
Atomic Energy Agency)
Adsorption behaviors of trivalent actinides (An (III))− 141 −

and lanthanides (Ln (III)) to activated carbons with andwithout oxidation by concentrated nitric acid were
investigated. Both An (III) and Ln (III) was adsorbed toactivated carbons in the range from pH 1 to 4, and the
distribution coefficients (Kd) of An (III) and Ln (III)increase with an increase of pH. Activated carbon without
oxidation exhibits significant selectivity to An (III)compared with Ln (III). On the other hand, the oxidationto activated carbon deteriorates the selectivity to An (III).
The depletion by the oxidation was attributed to theincrease of functional groups of oxygen-donor, e.g.,
carboxyl and/or carbonyl groups because these functionalgroups are unfavorable for separation between An (III) and
Ln (III). The selectivity of activated carbon without
oxidation would be attributed to the interaction between
π-electrons of aromatic ring and the metal ions.
1B11 Rapid reductive preparation of Np (IV) basedon the electrocatalytic reaction
KITATSUJI Y.1, KIMURA T.1, KIHARA S.2(1Japan Atomic Energy Agency, 2Kyoto Institute forInteresting Chemistry)
The behaviors of reduction of NpO2+ to Np4+ or Np3+ bycontrolled potential electrolysis were studied, and a uniquetime course of electrolysis current was observed. It was
concluded that NpO2+ was reduced by two reduction
processes at a platinum electrode: the chemical reaction
with Np3+ produced from Np4+ by electrode reaction andthe electrocatalytic reduction by adsorbed hydrogen atom
on platinum electrode surface. NpO2+ is reduced to Np4+
more selectively and with smaller overpotential throughelectrocatalytic reduction process, though long electrolysis
time are required to reduce NpO2+ completely. To improvethe electrolysis efficiency of the preparation of Np4+ from
NpO2+, the platinized platinum electrode was applied tobulk electrolysis. The rapid preparation of Np4+ comparable
to that of reversible redox reaction such as NpO22+/ NpO2+
with small overpotential was achieved successfully.
1B12 Development of Nitrogen Compounds: N, NDialkyl-2-(1 H -benzimidazol-2-yl)-pyridine-6carboxamide and Elucidation of Their Complexation
Toward f-element Ions.
AKUTSU, K1, 2., KOBAYASHI, T1., SHIWAKU, H1., SUZUKI,
S1., IKEDA-OHNO, A1., OKAMOTO, Y1., YAITA, T1, 2.
(1Japan Atomic Energy Agency. 2Graduate School of
Science and Engineering, Ibaraki University.)
The separation of trivalent actinides from lanthanides is
one of important processes for the treatment of high-level
radioactive wastes. Therefore, many nitrogen-donor
ligands, which show high separation abilities between
trivalent actinides and lanthanides, have been reported sofar. On these background, new nitrogen-donor ligands, N,
N-dialkyl-2-(1H-benzimidazol-2-yl)-pyridine- 6-carboxamide(BIZA) derivatives, having a various length of alkyl groups,
were synthesized; their complexation behaviors withtrivalent actinides and lanthanides were investigated byspectroscopic titration and XAFS measurements. Both themeasurements suggested that all the BIZA derivatives
formed Eu (III): BIZA = 1:1 and 1:2 complex with Eu (III)in methanol. Regarding the formation constant between
Eu (III) and BIZA, BIZA with octyl group (octyl-BIZA)
showed one-order smaller value than that with methylgroup (methyl-BIZA). Additionally, the average bonddistance of the N, O atoms of octyl-BIZA with Eu (III) was
longer than that of methyl-BIZA. These differences might

be due to a steric hindrance deriving from bulkiness of
their substituent. In this presentation, the extraction results
will be also presented.
1B13 Local fields in impurity-doped zinc oxide
SATO, W.1, OHKUBO, Y.2, YOKOYAMA. A.1, NAKANISHI,
T.1(1Inst. Sci. Eng., Kanazawa Univ., 2Res. Reactor Inst., Kyoto
Univ.)
Zinc oxide (ZnO) is an intrinsic n-type semiconductor,
and it is known that its conductivity varies with the presenceof dilute impurities. It is hence important to investigate
how impurity ions function in ZnO matrix. In our previous
work, we applied the time-differential perturbed angularcorrelation (TDPAC) method with the 111Cd (←111In) probe
to a study of local fields in 0.5 at.% Indium-doped ZnO,
finding unexpected behavior of conduction electrons at theprobe site. However, the specific site occupied by the
majority (~ 86%) of the In ions has not been determinedyet. In order to obtain information on the site, in this work,
we examined impurity-concentration dependence on
TDPAC spectra for samples doped with 0.05 – 10 at.% Inions. The electric field gradient (EFG) produced at theprobe nucleus has wider distribution with higher
concentration of doped In ions, as plausibly expected. In
the present paper, we discuss the EFGs at the probe sites
and their distribution on the basis of the temperaturedependence and impurity-concentration dependence of
the TDPAC spectra.
1B14 Magnetism and Mossbauer study of SnO2
films implanted with 57Fe,
NOMURA K.1, NEMETH Z.1, and REUTHER H.2(1School of Engineering. The Univ. of Tokyo, 2
Forschungszentrum Dresden-Rossendorf e.V. )SnO2 films containing 0.1% Sb and 3% Sb, implanted
100keV 57Fe ions with 5x1016 ions/cm2 into at the substratetemperature of 500oC in vacuum of 1x10-5 hPa, werecharacterized by conversion electron Mossbauer
spectrometry (CEMS) and Kerr effect measurements.
These films showed ferromagnetism at room temperature.
The 57Fe implanted SnO2 (3% Sb) film showed the smaller
Kerr effect than the 57Fe implanted SnO2 (0.1% Sb) film.
Two doublets are assigned to paramagnetic Fe3+ and Fe2+
species and two sextets are assigned to site A and site B ofmagnetite for as implanted film. The magnetite wasproduced much on the top layer, whereas paramagnetic
Fe2+ species were much included in deep layer. 57Fe
implanted SnO2 (0.1% and 3% Sb) films, post-annealed at
400oC for 6 hours, also showed ferromagnetism at room
temperature. It was found from CEMS that ferromagnetic
maghemite is produced from magnetite with increase ofparamagnetic Fe3+ and decrease of Fe2+ species.
1B15 Mössbauer spectra of new electricallyconductive vanadate glass
NISHIDA, T.,1,2 YASUMITSU, H1., ISODA, S.2(1Grad. School Advanced Sci. Eng., Kinki Univ. 2Fac.
Humanity-oriented Sci. Eng., Kinki Univ.)
Mössbauer spectra of heat-treated NTA glassTM shows a
step-by-step decrease in ∆ from 0.68 to 0.50 mm s-1,
indicating a decrease in the distortion of FeO4 and VO4tetrahedra. Structural relaxation of the glass network
results in a decrease in the Ea for the electrical conduction
from 0.38 to 0.13 eV, reflecting a decrease in the energy
gap between the donor level and the conduction band

− 142 −

(CB). An increased number of carriers (electrons/
polarons) occupying the CB will be associated with themarked increase in the conductivity from MΩcm to only
several Ωcm.
1B16 Mössbauer spectroscopic studies of oxalate
and malonate iron (III) complexes
KATADA, M., KIKUCHI, R., MOROZUMI, S., AKIYAMA,K.
(Grad. School of Sci. and Eng., Tokyo Metropolitan Univ.)
The relaxation phenomena for several kinds of oxalate
and malonate iron (III) complexes were studied by meansof Mössbauer spectroscopy. The Spin-spin interactions ofalkylammonium tris (oxalato) ferrate (III) and tris
(malonato) ferrate (III) complexes (n=12-18) became small
with increase in Fe-Fe distance. However, in the case ofn=10 for both complexes the line-width became larger thanthose of longer n-alkylammonium oxalate and malonate
iron complexes. Temperature dependences of line-width
on decylammonium oxalate iron (III) complex wereobserved. It means that the spin-lattice interaction was
predominant compared with the spin-spin-interaction.
An asymmetric quadrupole doublets was observed insome oxalate bridged dinuclear iron complexes. The
asymmetry arise from the Kramers doublet.
1B17 Improvement of signal-to-noise ratio in 57Mnin-beam Mössbauer Spectroscopy by utilizing aplastic scintillation counter
NAGATOMO, T.1, KOBAYASHI, Y.2, KUBO, M.K.1,
YAMADA, Y.3, MIHARA, M.4, SATO, W.5, MIYAZAKI, J.6,
SATO, S.7, KITAGAWA, A.7(1International Christian Univ., 2RIKEN Nishina Center,
3
Tokyo Univ. of Science, 4Osaka Univ., 4Kanazawa Univ.,
6
Nihon Univ., 7National Institute of Radiological Sciences)
We have studied unusual exotic chemical states of 57Fe
created through β decays of shortly lived 57Mn nuclei(T1/2=1.45 m), which were implanted with high energy into
KMnO4, graphite (HOPG), solid oxygen and Si
semiconductors, by means of the in-beam emission
Mössbauer spectroscopy. To detect the Mössbauer
resonant absorptions of 14 keV γ rays emitted form the57
Fe nuclei, we employed a parallel-plate avalanche counter(PPAC), which contained a 57Fe-enriched stainless-steel
absorber and was mounted on a Mössbauer transducer.
However, there still remains a significant problem that βrays emitted from 57Mn nuclei much degrades a signal-tonoise ratio (S/N) of Mössbauer spectra because the PPAC
has poor resolution to discriminate conversion electrons
produced through the resonant absorptions from theincoming β rays emitted from 57Mn nuclei. In the present
work, the Mössbauer measurement on 57Fe implanted into
a nonmagnetic metal Al plate (50 mm square, 1 mm thick)
was carried out at HIMAC of NIRS with a detection systemmodified by employing an anticoincidence method wherea plastic scintillation counter (0.5 mm thick) was set
between the PPAC and the Al sample in order to reject theβ-ray signals. And then, we have succeeded to obtain anemission Mössbauer spectrum of 57Fe in Al at room
temperature with very large S/N with the anticoincidence
method. We will introduce the experimental procedureand discuss the obtained results in detail.

1B18 In-beam Mössbauer spectroscopy of 57Mn
implanted into aluminum oxide
NAGATOMO, T.1, Y. KOBAYASHI, Y.2, KUBO, M. K.1,
YAMADA, Y.3, MIHARA, M.4, SATO, S.5, KITAGAWA, A.5,
MIYAZAKI, J.6, SATO, W.7(1ICU, 2RIKEN, 3Tokyo Univ. Sci., 4Osaka Univ., 5NIRS,
6
Nihon Univ., 7Kanazawa Univ.)
Aluminum oxide (Al2O3) has been extensively
investigated in materials science since its optical property
is controllable by the nature and amount of impurities. In
spite of the long history of studies, there still remainunresolved problems of the color changes arising from thepresence of impurities. The objective of this work is thus
to investigate the interacting nature of Fe ions implanted
as impurities with the Al2O3 matrix by in-beam Mössbauer
spectroscopy with the 57Fe (←57Mn) probe. The experiment
was carried out using Heavy Ion Medical Accelerator in
Chiba. The 57Mn beam was produced by the nuclear
projectile fragmentation reaction of 58Fe (500 MeV/u) witha beryllium target. 57Mn nuclei were implanted into an
Al2O3 polycrystalline disk (50 mm diameter and 5 mm
thickness). The 14.4 keV Mössbauer γ rays emitted from57
Fe (←57Mn) were detected by a parallel-plate avalanche
counter combined with a plastic scintillation β-vetocounter. The Mössbauer spectrum obtained at room
temperature was fitted by assuming two different
components consisting of a singlet (I.S. = -0.44 mm/s) anda doublet (I.S. = -0.72 mm/s, Q.S. = 1.9 mm/s). The singlet
peak is assigned to high-spin Fe3+ at the substitutional
Al3+ site, and the doublet might be interstitial Fe2+.
1B19 In-beam Mössbauer spectroscopy of 57Mn
implanted into magnesium oxide
NAGATOMO, T.1, KOBAYASHI, Y.2, KUBO, M. K.1,
YAMADA, Y.3, MIHARA, M.4, SATO, W.5, MIYAZAKI, J.6,
SATO, S.7, KITAGAWA, A.7(1International Christian Univ., 2RIKEN, 3Tokyo Univ. of
Science, 4Osaka Univ., 5Kanazawa Univ., 6Nihon Univ.,
7
National Institute of Radiological Sciences)
A study of 57Fe in-beam Mössbauer spectroscopy using
57
Mn provides direct information on exotic state of unstable
nuclear probes and on electronic properties of thesurrounding materials. Recently, our detection method
was successfully improved to obtain in-beam Mössbauer
spectra with very large S/N ratio using HIMAC (Heavy
Ion Medical Accelerator in Chiba). Here, we demonstrate
the validity of this technique applying to a simple metaloxide solid MgO. The 57Mn beam was produced as anuclear projectile fragment of the 58Fe beam. The sample
used was a MgO polycrystalline disk (50 mm diameter and
5 mm thickness) purchased from Furuuchi Chemical Co.
The Mössbauer spectrum of 57Mn implanted into MgOmeasured at room temperature was relatively simple,
which was fitted into the combination of a singlet (δ = 0.91 mm/s) and a doublet (δ = -0.55 mm/s, ∆Eq = 1.3mm/s). The singlet peak is assigned to high-spin Fe2+
surrounded by six O atoms, which substitute Mg2+ in MgO
crystal. The doublet might be an Fe atom with vacancy of
O atoms in neighbor, or an Fe atom in interstitial positionof MgO lattice. Density functional calculations with clustermodels were performed to make the assignments.

− 143 −

1P01 AMS Analysis of 10Be in the Dome Fuji ice
core, Antarctica
IWASAKI, A.1, SEKINE, T.2, HORIUCHI, K.3, MATSUZAKI,
H.4, MURAMATSU, Y.5, MOTOYAMA, H6(1Grad. School of Sci., Tohoku Univ., 2CAHE, Tohoku Univ.,
3
Grad. School of Sci. and Engi., Hirosaki Univ., 4School ofEngi., The Univ. of Tokyo, 5Depʼt of Sci., Gakushuin Univ.,
6
NIPR)
This study deals with the determination of cosmogenic
10
Be in Antarctic ice core samples collected from the Dome
Fuji station (at the depth of 290.5-300.5m) to know thesecular variation of amounts of the nuclide in the ancientperiod. Beryllium-10 (T1/2 = 1.5 x 106 y) is generated via
the nuclear spallation reactions of oxygen and nitrogenatoms with galactic cosmic rays.
Ratios of 10Be/9Be in both standards and the samples
were measured with AMS at MALT, University of Tokyo,
and the annual fluxes of 10Be deposition were estimated byusing snow accumulation rates obtained from δ 18O values
in this area. It was found that the 10Be flux varied from 20
x 104 to 55 x 104 atoms/cm2/y. When the concentration
variation of 10Be was compared with the secular distortionof the Cosmogenic nuclide 14C (IntCal04) and Sunspot
Number (S.K.Solanki et al. 2005), the similarity was seenin the variation pattern though there was a shift of several
decades. The shift at this age suggests the uncertainty ofthe model of determination of the ice core age.
1P02 Long-term denudation rates of karst surfaces
in Japan: estimates from cosmogenic 36Cl in calcite
MATSUSHI, Y.1, SASA, K.2, SUEKI, K.3, TAKAHASHI, T.2,
NAGASHIMA, Y.2, MATSUKURA, Y.4(1Micro Analysis Lab., Tandem Accel., The Univ. Tokyo,
2
Univ. Tsukuba Tandem Accel. Complex, 3RIC, Univ.
Tsukuba, 4Life and Environ. Sci., Univ. Tsukuba)This study quantified the long-term denudation of barecarbonate rock surfaces by using in-situ-produced
cosmogenic 36Cl in calcite. Rock samples were collectedfrom the topmost ~5 cm of exposed pinnacles at several
Japanese karst areas under subtropical to subarctic
environments. Concentrations of Cl and 36Cl in calcite were
determined by accelerator mass spectrometry at UTTAC(University of Tsukuba Tandem Accelerator Complex)
with isotope dilution by 35Cl spike. Concentration of Ca andabundances of neutron absorption nuclei were determinedby prompt gamma-ray analysis with JRR-3M (Japan
Research Reactor No. 3) at JAEA (Japan Atomic Energy
Agency) to calculate 36Cl production rate in calcite. The
nuclide concentrations were of the order of 105 to 106 atomg−1. These data were converted to the rate of total
denudation that averages chemical and physical processeson the limestone surfaces over 104–105 yr-timescales. The
denudation rates range from ~15 to 60 mm kyr−1, being
lowest under temperate climate conditions in the central
part of Japan, higher in subarctic northern areas andsubtropical southwest areas in Japan. Modeling of thistendency with climate factors at each area indicates a shift
in relative importance of chemical (dissolution) andphysical (frost shattering) processes in the denudation ofkarst landforms, depending on mean temperature, annual
precipitation, and annual freeze-thaw days. The dissolution
rates of carbonate rock surfaces in the southern parts ofJapan can be modeled by an Arrhenius-based equation ofmean temperature and annual precipitation.

1P03 Measurement of 36Cl in organic substance ofsoil
AMANO, T.1, SUEKI, K.1, TAMARI, M.1, KITAGAWA, J.1,
SASA, K.2, NAGASHIMA, Y.2, TAKAYA, Y.2, OKI, T.2,
TAKAHASHI, T.2, KINOSHITA, N.2, TOSAKI, Y.2,
MATSUSHI, Y.3, BESSHO, K.4(1Grad. School of Pure and Applied Sci., Univ. of TSUKUBA,
2
AMS Group, Tandem Accel. Complex, Univ. of Tsukuba,
3
Micro Anal. Labo., Tandem Accel., The Univ. of Tokyo,
4
High Ener. Accel. Res. Organ.)
It is thought that the isotope ratios 36Cl/Cl in soil haveseveral origins such as chlorides, organochlorines, etc.
This work is focused on 36Cl/Cl of organochlorines. We
used surface soil around Radioisotope center in Universityof Tsukuba for a test. Chlorides were extracted in the soil
with 0.01 mol/l HNO3, and the extracted solution was
called “Extraction sample”.
The residual soil after
extraction burnt in oxygen gas, and the generated gas wastrapped with 1.25 mol/l NaOH. It was called “Combustion
sample”. Additionally, We burnt another soil without
extraction and got “Total combustion sample”. The AMS
measurementresultsshowedthat 36Cl/Cl=(9.8±1.0)×10−14of “Combustion sample” was higher than 36Cl/Cl =(6.0±0.5)×10−14 of “Extraction sample”. The 36Cl/Cl of“Total combustion sample” was (8.5±0.7)×10−14 whose
value showed between “Combustion sample” and“Extraction sample”. By using the core sample soils to 1 m
in depth that we got at Rokkasho-mura in Aomori
prefecture, we searched the isotope ratios 36Cl/Cl in depth
at surface. The isotope ratios 36Cl/Cl of “Extraction
samples” and of “Combustion samples” showed a different
tendency.
1P04 Improvement of 14C measurement by JAEAAMS-TONO
Saito-Kokubu, Y.1, Nishizawa, A.2, Ohwaki, Y.2, Nishio, T.2,
Suzuki, M.1, Ishimaru, T.1(1Geological Isolation Research and Development
Directorate, JAEA, 2Pesco Corp., Ltd.)An accelerator mass spectrometer (JAEA-AMS-TONO)
installed at the Tono Geoscience has been used to measure
14
C concentrations of samples at requests of internal andexternal laboratories which carry out studies of geoscience.
Recently, demands for measurement of small amount ofsample are mounting. By request, the AMS and sample
preparation technique were improved.
In order to obtain a stable beam, a new temperature
control system was equipped with a cesium oven on an ion
source. This caused that a variation in temperature of theoven was within 1 °C and stability of the beam enhanced.
For measurement of small amount of sample, theinfluence of smaller amount of samples than predetermined
one and how to fill a cathode with small amount of graphite
were studied. On the latter study, two kinds of methods
were attempted; (1) iron powder was filled following to fillof the graphite, (2) the graphite and the iron powder weremixed and then the mixture was filled. Counts of 14C in
IAEA C1 prepared by the method (1) were gradually
decreased and those in the sample of the method (2) wererelatively stable. Therefore the method (2) would enableprecise isotope ratio measurement.
1P05 Tungsten shield for low level counting
HAMAJIMA Y.
(LLRL, Kanazawa Univ.)
The sintering tungsten shield (diameter: height:− 144 −

thickness = 130mm : 200mm : 10mm) for low level counting
has been made experimentally, set on inside of conventional
lead shied, and tested for BKG spectrum of Ge detector in
Ogoya Underground Laboratory (OUL), because it isdifficult to get low BKG old lead shield. Sum of BKG
counting rate from 50 keV to 2000 keV of tungsten shield
was 7.9 cpm higher than old lead shield (1.6 cpm), althoughthickness of tungsten shield is 2/5 of lead shield. Peaks of40
K, 214Pb, 214Bi, 228Ac, 208Tl, which were not found in old leadshied, were detected. No peak of 210Pb, environmental
neutron induced 187W, and energy region from 70 keV to
200 keV was found. This sintering tungsten shield is notsuitable for ultra low level counting in OUL, but may beavailable for conventional or low level counting inaboveground laboratory.
1P06 Ion-exchange separation for accurate trace
analysis of environmental samples for safeguards
MIYAMOTO, Y., YASUDA, K., MAGARA, M., KIMURA,
T.
(Nuclear Science and Engineering Directorate, JAEA)
In the isotopic analysis with ICP-MS, tungsten forms
polyatomic ions whose molecular weights are 233, 234 and235, and interferes with the measurement of uranium.
Tungsten should be separated chemically from uranium
for accurate isotopic analysis of trace uranium. In thiswork, chemical separation of tungsten from uranium andplutonium in environmental samples for safeguards with asingle anion-exchange column was investigated. The
mixture of HCl and HF was used as an eluent for anionexchange separation of tungsten from uranium. It foundthat 10 ml of the mixture of 8 M HCl and 0.5 M HF wasappropriate for the elimination of tungsten from uranium,
and 10 - 15 ml of the mixture of 0.1 M HCl and 1 M HF wasappropriate for separation of uranium from tungsten. The
both anion-exchange separation techniques are able toeliminatealmostalltungstenfromuraniuminenvironmental
samples.
1P07 Particle size distributions of 7Be-aerosols insurface air at Nagano City
MURAMATSU, H., KONUMA, T., MIYAJIMA, A.
(Fac. of Edu., Shinshu Univ.)
The particle size distribution of 7Be-aerosols has been
observed using the Andersen-type classifier combinedwith the high volume air sampler. Aerosol particles wereclassified and collected on four glass fiber filters, i.e., over7.0µm in the first-stage, 3.3-7.0µm in the second stage, 2.0
3.3µm in the third stage, and 1.1-2.0µm in the fourth stage,
and on a back-up filter for aerosols smaller than 1.1µm in
diameter, with a constant flow rate of 566 l/min. About 80%
of collected activities were found in the back-up filter,
which means that the majority of 7Be activity would
attached to aerosols with the diameters less than 1.1µm.
Using three data corresponding to particle-size ranges of
3.3-7.0, 2.0-3.3 and 1.1-2.0µm, Activity Median Aerodynamic
Diameter (AMAD) was estimated under the assumptionthat the particle size distribution of 7Be-aerosols in surface
air is in a lognormal and unimodal distribution. Estimated
AMADs in early summer and in autumn were 0.43µm and0.55µm, respectively, which should correspond to themean value of so-called accumulation mode aerosols
formed by coagulation of ultrafine aerosols.

1P08 Long-term measurement of radioactive
nuclides in rainfall and fallen dust
SUZUKI, F.1, OHASHI, H.2(1Grad. School of Marine Sci. and Tech., Tokyo Univ. of
Marine Sci. and Tech., 2College of Marine Sci. and Tech. ,Tokyo Univ. of Marine Sci. and Tech.)
To investigate the radioactive nuclides transfer from theatmosphere to the ground surface, rainfall and fallen dust
samples were collected from 2005 to 2009 with a basin(effective area 0.2m2). Monthly samples were absorbed toion exchange resin and measured with a Ge semiconductor
detector at ICRR, the University of Tokyo for 210Pb(halflife=22.3y), 7Be (53.3d), 40K (1.27x109) and 137Cs (30.07y).
According to the analysis, remarkable season variations ofdeposition flux and rain concentration of all the radioactive
nuclides were not found. These activity levels were foundto depend highly on amount of precipitation.
1P09 Research of Local Fallout 236U produced by
Hiroshima Atomic Bomb
KAWAI, K.1 SAKAGUCHI, A.2 HOSHI, M.3 IMANAKA, T.4
Steier, P.5 YAMAMOTO, M.1(1LLRL, Kanazawa Univ., 2Grad. School Sci., Hiroshima
Univ., 3Res. Inst. Radiat. Bio. and Med., Hiroshima Univ.,
4Res. React. Inst., Kyoto Univ., 5Wien Univ.)
Since atomic bomb enriched in 235U was exploded over
Hiroshima in 1945, the distribution of local fallout has been
demanded from a viewpoint of exposure dose evaluationby the residual and fallout radioactivities. The studies on
the fallout radionuclides have been mainly made about
fission product 137Cs, but fallout distribution has needed
further clarification. By this atomic bomb, 236U (T1/2 =2.342×107 y, α-decay) may be expected to be formed byfollowing nuclear reaction; 235U(n, γ). Therefore, present
study was made to examine the possibility of 236U detection
and possible availability of 236U for clarifying local fallout
distribution. Measurements of 236U, 137Cs and 239+240Pu in
surface soils from Hiroshima were performed together
with those for soils from Ishikawa Prefecture as
background, by using AMS (Wien Univ.) and γ-ray andα-particle spectrometers, respectively. The 236U wasclearly detected for all of the soil samples, but these results
didnʼt show any significant difference between 236U/239,240Pu
ratios in Hiroshima and Ishikawa surface soils, indicatingthat the global fallout 236U is dominant contribution and the
local fallout 236U produced by Hiroshima atomic bomb is
negligibly small contribution.
1P10 Radon concentration in natural water
HORIUCHI, K.
(Otsuma Womenʼs Univ.)
In 1985, Environment Agency specified“Meisui 100 Sen”
in all over the country. we have measured the radon
concentration in “Meisui 100 Sen” and whose around water
for the collection of the basic data about the natural water.
Many of “Meisui 100 Sen” is used as a tap water source,
daily life water, and tea ceremony water and very familiar
with the local people. Most of “Meisui 100 Sen” radon
concentration is under 25 Bq/l or so, but a few water which
forth out from the granite layer is very high. It is wellknown that radon concentration and its decay products
have given many kinds of valuable information for the
study of geochemical phenomena such as flowing
mechanism and residence time of spring and groundwateror so.
Recently, people have come to worry about the extension− 145 −

of the decrease and the artificial pollution of the natural
water especially “Meisui 100 Sen”.
1P11 Experimental study on radon loss from water
sampleYAMADA, N.1, UESUGI, M.1, SATO, W.2, YOKOYAMA,
A.2, NAKANISHI, T.2(Grad. School Nat. Sci. Tech.1, Kanazawa Univ., Inst. Sci.
Eng., Kanazawa Univ.2)
In the determination of radon in water sample, particularattention should be given to the radon loss from the sample.
In a field experiment, radon concentration in running waterfrom a spring decreased with the distance from the welling
point. Thereupon, laboratory experiments by using thespring water mentioned above were undertaken. Whenthe spring water was allowed to stand in a beaker in contact
with air, radon loss was not observed for 20 minutes. Whenthe spring water was stirred, however, after 20min stirring
20% of radon loss was occurred at 60rpm and 60% loss at
300rpm. The degree of radon loss was roughly proportional
to the stirring time at constant stirring speed.
1P12 Uranium series nuclides bound to colloids inborehole groundwater in Kanamaru area, Niigata
and Yamagata Prefectures
KANAI, Y., SEKI, Y. and OKUZAWA, K.
(Geological Survey of Japan, AIST)The behavior in the form of colloid becomes of a great
concern recently because the colloidal materials ingroundwater may transport the contaminant in theenvironment. Especially, it is an urgent need to understanddetailed behavior of the colloidal materials related to thegroundwater pollution and the geological disposal of thehigh-level radioactive waste (HLW). On the other hand,uranium is a radionuclide existing in nature, and also
contained in the HLW, therefore its behavior in nature
attracts much attention as a natural analogue. However,such studies are few and have not yet been shown clearly
about the uranium series and their colloidal behavior ingroundwater. Therefore the behavior of uranium series
nuclides and their colloidal behavior in the groundwater in
Kanamaru area, Niigata and Yamagata Prefectures, werestudied in this study. The uranium series nuclides in the
groundwater taken in 2002 at Br1 and Br2 boreholes wereanalyzed. Uranium content was low in shallow groundwaterand high in deep groundwater, and U-234/U-238>1. Th230/U-234 activity ratio was >1 in shallow groundwater
while <1 in deep groundwater. Further measurements
conducted in 2005, showed that the excessive Th-230 was
not observed. The surface groundwater obtained from
Br3-3 borehole (Multi-Packer system) showed Th-230/U234 >1, and the possibility of the colloid and the suspension
was suggested. The water sample taken from the depth of
9.95-11.05m (uranium concentrated layer) of the Br3-3
borehole was preliminary analyzed for the colloid size
fractionation analysis.
1P13 Adsorption structure of metal ion on soil
including humic acid
ITOU, Y., SHOZUGAWA, K., MATSUO, M.
(Graduate School of Arts and Sciences, The University ofTokyo)
It is important to determine the concentration of metal
ion in natural soil for environmental assessment. But
humic acid which is contained in natural soil influences thequantity of adsorbed metal ions on soil. We investigatedthe quantity of adsorbed metal ion on amorphous clay
mineral “allophane” in the condition containing humic acid.
We determined concentration of metal elements in humic
acid by instrumental neutron activation analysis (INAA).
The result shows that calcium is contained most. Therefore,
we thought that humic acid has high affinity with calcium
and used calcium for this experiment.
We adsorbed calcium on allophane on the condition thatthe concentration of humic acid was 10ppm and 0ppm in
pH 5, 7, 9 and 11. In the system containing humic acid thequantity of adsorbed calcium on allophane increased as pH
increased. On the other hand, in the system no humic acidthe quantity was almost same from pH 5 to pH 9, but
drastically increased at pH 11. Humic acid decreased thequantity of adsorption in an acidic condition and increased
that in a basic condition. It is suggested that acidneutralization ability of humic acid and adsorption structure
are related to the difference of the quantity of adsorption.
1P14 Fluxes of Pb-210 and Cs-137 in lake
sediments
KANAI, Y.
(Geological Survey of Japan, AIST)
Lead-210 and cesium-137 in the lake bottom sediments
are used to calculate the sedimentation rate and age of thebottom sediment although each origin and behavior isdifferent. That is, the former flux is considered to be almost
constant. On the other hand, the latter flux at present isthought to be the transportation by rolling up of the past
deposited nuclide because there is little burst at present.
However, the depth profiles of these radionuclides
observed in the deposit core don't correspond clearly, andthe geological various processes to change in such fluxes
are considered. In this study, the depth profile, their fluxes
and inventories in the core of the lake bottom sediments(Lake Suwa, Lake Shinji and Lake Nakaumi) were studied
in relation to a geological model. The inventories of lead210 and cesium-137 were almost in linear relationship in
the same lake and the surface fluxes of both nuclides also
showed a linear relationship. For the flux of lead-210, theatmospheric deposition and the inflow from river are major
sources. For cesium-137, the flux supplied from the rivermight be a major source. The linear correlations observedin the studied lakes suggest that each nuclide did not pile
up independently in one lake but both entered in the lake,presumably mixed, homogenized and piled up. This wasverified by the model calculation in this study.

1P15 Extremely low background measurementof 208Bi in the soil of the Semipalatinsk nuclear
test site in the former USSR.
KOJIMA, S.1, ARINOBU, T.1, KOSUDA, C.1, HAMAJIMA,
Y.2, YAMAMOTO, M.2, SAITO, T.3(1Aichi Med. Univ. School Med., 2LLRL, Kanazawa Univ.,
3Radioisot. Res. Cent., Osaka Univ.)
Residual radioactivities in the surface soil from the
Semipalatinsk Nuclear Test Site in the northern part of the
Kazakh Republic have been studied. The neutron induced
radionuclides, such as 60Co, 108mAg, and 152,154Eu, and thefission product, 137Cs, were measured in the soil sample
collected at the bank of crater which was formed by anunderground nuclear detonation on 15 January 1965. The
radioactivity of 207Bi in the same sample was measured witha high sensitive well-type Ge detector after radiochemical
separation. Although the possible nuclear reactions of207
Bi were offered, the production reaction has not been

− 146 −

determined. The object of this study is to explore further
investigation about the radionuclide of 208Bi(half life;
3.7x105 y) expected to be produced by the similar nuclear
reaction. However, the gamma-ray of 2615 keV emitted
from 208Bi cannot be measured with a conventional
detection system because of the interference by the
background gamma-ray from 208Tl. The extremely low
background measurement system at Ogoya Underground
Laboratory in LLRL, Kanazawa University was adopted todetermine the amount of 208Bi in the radiochemicallyseparated Bi sample. The preliminary result was obtainedthat the count rate of 2615 keV gamma-ray from 208Bi was(2.7±1.5) x10-5 cps.
1P16 The coprecipitation behavior of Ba and Ra
with manganese dioxide
HINAMI, S.1, NAKANISHI, T.2(1Grad. School Nat. Sci. Tech., Kanazawa Univ., 2Inst. Sci.
Eng., Kanazawa Univ.)
The quantitative determination of radium in water
sample is usually carried out by the coprecipitation ofradium with barium sulfate and by the gamma-ray
measurement of the precipitate. However, barium reagentsusually contain a certain amount of radium because of thesimilarity of chemical property between barium andradium; hence the use of barium reagent is limited to theextent that the gamma-ray measurement of low level
radioactivity of radium in water sample is not interferedwith radium from barium reagent. Accordingly, theremoval of radium from barium reagent is important in themeasurement of the low level radioactivity of radium inwater sample. In this work, the possibility of separation ofradium from barium reagent has been investigated using
manganese dioxide coprecipitation. The results show thatmanganese dioxide coprecipitates radium in preference tobarium and that the separation of Ra from Ba was improvedin the presence of 18-Crown-6 (1, 4, 7, 10, 13, 16hexaoxacyclooctadecane) in the coprecipitation system.
1P17 Lateral distributions of 228Th activity andRa/226Ra activity ratio of surface water within the
Sea of Japan, the East China Sea, and the Sea of
Okhotsk
Yoshida, K1., Inoue, M1., Minakawa, M2., Nakano, Y1.,
Kofuji, H3., Otosaka, S4., Kiyomoto, Y5., Shiomoto, A6.,
Hamajima, Y1., Yamamoto, M1.
(1LLRL, Kanazawa Univ., 2National Research InstituteFisheries Science, 3Japan Atomic Energy Agency, 4Japan
Marine Science Foundation, 5Seikai National Fisheries
Research Institute, 6Tokyo Univ. Agriculture)
The Sea of Japan, one of the largest marginal seas of theWestern Pacific Ocean, is surrounded by the Eurasiancontinent and the Japan Islands, and is connected to the
Pacific and other marginal seas by the Tsushima, Tsugaru,
and Soya Straits, which have very shallow depths of lessthan 150m. Therefore, the circulation of the mixed layerwater is governed by the complicated lateral movements of
the Tsushima Current from the East China Sea and of the
Liman Current from the Soya Strait. To study thecirculation of water masses and particles within the Sea ofJapan, surface water samples were collected from 25
stations within the Sea of Japan, the East China Sea, andthe Sea of Okhotsk during the early summer of 2005-2008.
By employing low-background γ-spectrometry combinedwith simple coprecipitation processing on water samples,
the activities of 226Ra (half-life t1/2 = 1600y), 228Ra (5.75y),228

and 228Th (1.91y) were determined. It is noteworthy thatthe 228Th activity of the surface water from the southernareas (the Yamato and Tsushima Basins and the coastal
areas along Honshu Island) was lower compared to that ofwaters from northern areas (the Japan Basin, Yamato Rise,and the coastal areas around Hokkaido). The lateral
distribution of 228Th clarifies important aspects of physicalmovement of geochemical species within the Sea ofJapan.
1P18 Distribution of Pu-239,240 concentration in
the eastern Pacific
TAKIMOTO,K.1,SUMI,T.1,KINOSHITA,N.2,NAKANISHI,
T.3(1Grad. School Nat. Sci. Tech., Kanazawa Univ., 26CPFGO#EEGNGTCVQT%QORNGZ7PKX6UWMWDC 3Inst. Sci. Eng.,
Kanazawa Univ.)
Geographical and depth distribution of anthropogenic
radionuclides of Pu-239, 240 (T1/2 = 2.411 × 104 yr, 6.563 ×
103 yr) was studied in the eastern Pacific in 2003. As aresult of analyses of Pu isotopes in seawater columns andsediment columns, it was found that Pu-239, 240 inventory
in water columns was 0.8-5.1 Bq/cm2 and Pu-239, 240
inventory in sediment columns was 0.3-1.2 Bq/cm2. The
Pu-239, 240 inventory ratio of water-column/sedimentcolumn was calculated to be 3.9-15.2. This inventory ratios
compared with those reported for western Pacific gives us
information on the sinking behavior of Pu in the eastern
Pacific.
1P19 Research on the chemical states of sediments
in Tokyo Bay under reducing condition
HARA, N., SHOZUGAWA, K., MATSUO, M.
(Graduate School of Arts and Sciences, The University ofTokyo)
This study was conducted to investigate the chemical
states of sediments under reducing condition. We collected
core samples of tidal-flat sediments in Tokyo Bay whereanoxic zone often appears and in Koajiro Bay by way ofcomparison. We measured oxidation-reduction potential(ORP) of the sediments on the sampling.
X-ray absorption near edge structure (XANES) spectraof sulfur K-edge of the sediments in estuarine area of Tokyo
Bay indicated that two pre-edge peaks which belong toS2-[-II] (2472eV) and SO32-[+IV] (2474eV) become larger
and that a white peak which belongs to SO42-[+VI] (2480eV)
becomes smaller as the depth of the samples increases. It
means that the oxidation number of sulfur dominantly
decreases in a vertical direction as ORP value decreases.
In Tokyo bay, anoxic water mass arises and extremely
heavy reducing condition is made up on tideland sediments.
It is suggested that we can assess the past reducing
condition of Tokyo Bay by analyzing the chemical states of
elements in the sediments. We also report about theresults in Koajiro Bay.
1P20 Distribution of Extractable Organohalogens(EOX) in Tissues and Organs of Great Cormorant(Phalacrocorax carbo)
KAWANO, M.1, SHIKI, Y.1, KAKOI, T.1, MATSUDA, M.1 ,SUDO, A.2, MORITA, M.1(1Faculty of Agriculture, Ehime Univ., 2Eaglet Office Inc.)
Instrumental neutron activation analysis (INAA) was
conducted for the analysis of extractable organohalogens(EOX) in the tissue and organ samples of great cormorant(Phalacrocorax carbo) collected in Lake Biwa, Shiga Pref.,− 147 −

Japan. The concentration order of EOX was extractableorganochlorine (EOCl) > extractable organocbromine(EOBr) > extractable organoiodine (EOI). As the resultsof investigation into the concentration of EOCl in tissue
and organ samples, the highest concentration of EOCl was
determined in fat tissue, and the second one was in brain
sample, suggesting the presence of different chemical
structure compounds in fat tissue and brain of great
cormorant from Lake Biwa.
1P21 Determination of trace elements andtransformation of proteins in pancreasof zincdeficient mice
SHIMOYAMA, H.1, MURAMATSU, W.1, YAMAMOTO,
O.2, KAWASHIMA, M.1, SUGANUMA, H.2, YANAGA, M.2(1Graduate School of Science, Shizuoka University,
2
Radioscience Research Laboratory, Faculty of Science,
Shizuoka University)
Concentrations of trace elements and proteins inpancreas of Zn-deficient and control mice were investigated.
Eight weeks old male mice of ICR strain were divided into
two groups; one was fed with Zn-deficient diet, and theother with control diet. After one week of dividing, theirpancreases were removed and homogenized in a Tris
buffer. Then, cytosol was separated from the homogenate
by centrifugal separation method. SDS-PAGE and 2D
electrophoresis were carried out. Proteins in cytosolic
fraction were also separated into twenty fractions by gelfiltration chromatography. Then, Bradford protein assay
and the atomic absorption spectroscopy were performed
for each fraction. For concentration of protein in all
fractions, there were no significant differences between
two groups. On the other hand, concentrations of zinc inseveral fractions of Zn-deficient group were decreased.
These results indicate that some zinc-bound proteins may
exist for apo-protein.
1P22 Evaluation for Olfactor y Transport of
Intranasally Administered Insulin-like Growth
Factor-I
NAGAOKA, M1., WASHIYAMA, K.2, KOSAKA, K.3,
AMANO, R.2(1Grad. School Medical Sci., Kanazawa Univ., 2College
Med. Pharmaceutical and Health Sci., Kanazawa Univ.,
3Fac. Med. Kanazawa Univ.)
Insulin-like Growth Factor-I (IGF-I) is thought to be
useful for improvement of stroke and neurodegenerative
diseases. Although intranasally administered IGF-I isshown to have pathways for direct transport to the mousebrain across blood brain-barrier, the mechanism andinterval of time required for transport are still unknown.
In the present study, for elucidation of these problems, westudied the temporal IGF-I transport into mouse central
nerve system comparatively by administering radioiodinelabeled IGF-I solutions intranasally or intravenously.
IGF-I solutions, which were prepared for three types of
specific activities, were intranasally and intravenously
administered in mouse nasal cavity and in tail vein,
respectively. Each group mice were sacrificed underanesthesia and then samples of blood, brain tissues, nasal
cavity and skin were excised at some different time point.
All samples were measured with γ-counter and calculated
uptake rate (%dose/g), except nasal cavity and skin, whichwere calculated uptake percentage (%dose).
In the group of intranasal administration, the uptake
percentage of nasal cavity and uptake rate of blood andbrain tissues were increased with a decline in specificactivity. Also, uptake rate in olfactory bulb and trigeminal
nerve were higher than any other tissues and blood until
60 minutes after administration.
1P23 Production of no-carrier-added Lu-177
capable of labeling antibodies
WATANABE Sa.1, HASHIMOTO, K.1, WATANABE, Sh.1,
IIDA, Y.2, HANAOKA, H.2, ENDO, K.2, ISHIOKA, N.1(1Japan Atomic Energy Agency, 2Gunma University
Graduate School of Medicine)
Production of highly-purified no-carrier-added (nca)177
Lu capable of labeling antibodies was developed using
reversed-phase ion-pair liquid chromatography with 2hydroxyisobutyric acid (2-HIBA) and 1-octanesulfonic acidsodium salt (1-OS) as a complexing and an ion-pairing
agent, respectively. 177Lu was produced via the 176Yb (n, γ)
177
Yb (T1/2=1.911h) → 177Lu process. Enriched 176Yb2O3
targets were irradiated at JAEA JRR-3, dissolved in HCl
and loaded on a reversed-phase column to separate the177
Lu from the Yb target. Elution was done with 0.25 M 2HIBA/0.1 M 1-OS, which has been purified by a cationexchange column and a chelating ion exchange column,
respectively, to eliminate metallic impurities such as Ca, Fe
and Zn. The pure 177Lu fraction separated was loaded on acation-exchange column, and then washed with 0.1 M HCl
to eliminate 2-HIBA/1-OS. For elimination of further
metallic impurities, an anion exchange process was carriedout after the cation exchange process of the main
separation. The labeling experiment of the antibody withthe 177Lu showed that the radiochemical yield of the 177Luantibody increased to more than 80% from less than 5% by
the elimination of metallic impurities. Consequently,
production of nca 177Lu capable of labeling antibodies was
succeeded.
1P24 Study of the 188W - 188Re generator using PZC
and synthesis of 186Re and 188Re-DMSANOGAWA, N.1, HASHIMOTO, K.2, KURIHARA, Y.3,
KOIKE, Y.1, MORIKAWA, N.1, IJIRI, K.1(1Radioisotope Center, The University of Tokyo, 2Japan
Atomic Energy Agency, 3Organisation for the Strategic
Coordination of Research and Intellectual Property, Meiji
University)
Both 186Re (βray max 1.08 MeV) and 188Re (βray max 2.12
MeV) are expected as therapeutic nuclides in the cancer
treatment and the pain easing. Poly Zirconium Compound(PZC) has the adsorption capacity of the tungsten tens oftimes or more the alumina. The basic experiment wasdone for preparation the small size and practical 188W-188Re
generator using PZC. Adsorption yield of 188W to PZC for
example showed more than 90% by the heating of 90℃ and3 hours. Dimercaptosuccinic acid (DMSA) is expected asradioactive medicine for cancer diagnosis and therapy.
Synthesis of 186Re and 188Re-DMSA were examined under
the alkali condition (pH 14).
1P25 Preliminar y evaluation for production andradiochemical
separationofan
α-emitting
radionuclide, 230U
WASHIYAMA, K.1, TAKAHASHI, N.2, ARAKI, M.3,
YOKOYAMA, A.4, SHINOHARA, A.2, AMANO, R.1(1College of Medical, Pharmaceutical and Health Sciences,
Kanazawa Univ., 2Grad. Sch. of Sci., Osaka Univ., 3Grad.
Sch. of Natural Sci. and Technol., Kanazawa Univ., 4Collegeof Sci. and Engineering, Kanazawa Univ.)− 148 −

Due to short range and high liner energy transfer ofalpha particle in human tissue, targeted alpha therapy(TAT) has been applied for cancer therapy and many
clinical studies have been performed with the alphaemitting radioisotopes such as 223Ra, 213Bi, and 221At.
However, the very limited availability of 225Ac/213Bi
worldwide, and cyclotron capacity made difficult to provide
213
Bi and 211At for clinical use. Uranium-230 is a cyclotron
produced alpha-emitting radionuclide with a long half-life(T1/2 = 20.8d). According to the reaction 232Th (p, 3n) 230Pa
and following the β- decay of 230Pa, 230U can be produced
within the irradiated target. The daughter of 230U, 226Th(T1/2 = 31m) provides a rapid cascade of 4 alpha particles
with a 27.7 MeV of total energy. Therefore, 230U is desired
to compensate the problem of limited supply of alphaemitter. In this study, we investigated the availability of
production of 230U and its radiochemical separation.
Protactinium-230 was produced by irradiation of 232ThO2
target on K-70 AVF cyclotron at the Research Center for
Nuclear Physics (RCNP), Osaka University.
Afterirradiation, the target was stand for 4 weeks to generate
230
U following to the β- decay of 230Pa. The target wasdissolved in HNO3 and converted to HCl solution. The
HCl solution was loaded on to an anion exchange column
and 230U was separated from the target. After separation,
230
U was loaded on another anion exchange column and its
daughter, 226Th was eluted. The activity of 226Th and its
daughter nuclides were assigned by α spectrometry.
1P26 Estimation of neutron fluxes at the 18 MV
medical electron liniac room in Hiroshima University
Hospital by an activation foil method and activation
activities of the screws of wall sockets.
SAKAMA, M.1, SAZE, T.2, OHNO, Y.3, NAKAMURA, H.4,
TOYODA, A.4, IIJIMA, K.4, KOSAKO, K.5, OISHI, K.5,
MASUMOTO, K.4(1School Health Sci., Univ. Tokushima, 2RIC, Univ.
Tokushima, 3Dep. Radiology, Hiroshima Univ. Hospital,
4
KEK, 5Center Atomic Energy Engin., Insti. Tech.,
SHIMIZU Corp.)
Recently, from a radiation safety management point ofview, it has been discussed to construct guidelines on
estimation of neutron fluxes produced via operating various
medical small accelerators and to establish uniformly theclearance system related to having neutron activation
effects into each accelerator facility. That is, it was the aimof this investigation to accumulate the data on estimationbasis of neutron flux measurements at those medical small
accelerators by an activation foil method and activation
activities of materials in the accelerator facilities. In thiswork, the neutron fluxes at the 18 MV electron liniac
apparatus of Hiroshima University Hospital have beenmeasured by an activation Au foil method and activation
activities of screws of wall sockets. For the activation
activities of the screws of wall sockets, an 1115.55 keVgamma-ray peak of 65Zn produced via a 64Zn(n, γ) 65Zn
reaction was observed at each screw sample in the medical
18MV electron liniac room. The screw sample has
contained about 35% zinc and 60% copper which were
measured by an X-ray fluorescence analysis, and an isotope
abundance of 64Zn is 48.6% in zinc isotopes. As a result ofactivation activities of 65Zn in the screws of wall sockets, it
was also found that the thermal neutron fluxes would be
distributed all around the electron liniac room and themeasured values are over the range 3.3×104 to 9.9×104
cm-2 s-1.

1P27 Synthesis of water-soluble encapsulatedradioisotope fullerenes
SUEKI, K.1, NAGASAKI, Y.1, KAMITSUKASA, T.1,
AKIYAMA, K.2, TSUKADA, K.3, ASAI, M.3, TOYOSHIMA,
A.3, NAGAME, Y.3(1Grad. School of Pure and Applied Sci., Univ. of Tsukuba,
2
Grad. School of Sci. and Eng., Tokyo Metropolitan Univ.,
3
JAEA)
We investigate to trace the synthesis process of watersoluble encapsulated-radioisotope fullerenes using therecoil of nuclear reaction. In order to produce RI@C60,
about several ten mg C60 fullerenes powder was mixed
homogeneously with about several ten mg of oxide (As2O3etc.) and used to the target material. Proton irradiation
with beam energy of 13 MeV was performed at the
TANDEM in JAEA. The irradiated fullerene samples weredissolved in CS2 after being filtrated to remove insoluble
materials through a membrance filter. The separation of
the RI@C60 from the solved sample was achieved by two
steps HPLC which are the HPLC processes on 5PBB andBuckyprep columns. The yield ratios of monomers labeledwith radioisotopes were about 1-2 X 10-4. Toluene solutionsof isolated 75Se@C60 with C60 were vigorously vibrated withsaturation KOH aq containing few drops of TBAH (10 % inwater) as catalyst at room temperature. The reaction times
were 5 - 480 minutes. The resultant brown solution was
the passed down a Sephadex G25 size-exclusion gel
chromatography column using distilled water as the eluent.
We obtained which the activity ratios of 75Se in three phases(Organic phase, KOH aq. phase, and precipitate) as
function of reaction time, and which the fraction yields of
75
Se in dissolved precipitate through a Sephadex G25 asfunction time of reaction time. The reaction time waschanged the distributions of the activity to a KOH aq.
phase and precipitate. As reaction time is long, the activity
exists in the KOH phase, and the fraction yields of 75Se@
C60 increased. The chemical behavior corresponded to the153
Sm@C82.
1P28 Study on HPLC Elution Behavior of
Lanthanide
Metallofullerenes
Using
PyrenylStationar y Phase
AKIYAMA, K1., FURUKAWA, H.1, SAITO, A.1, HAMANO,
T.1, SUEKI, K.2, KATADA, M.1(1Grad. School of Sci. and Eng., Tokyo Metropolitan Univ.,
2
Grad. School of Pure and Applied Sci., Univ. of Tsukuba)
Metallofullerene is one of the most interesting materials
because of their characteristic molecular structure andelectronic state. However, their properties are not wellstudied due to the small amount of their production yield
which is about 1/1000 compared with that of typicalfullerene C60. Radiochromatography is one of the mostpowerful methods to study the properties of such small
amount of materials. In this paper, we report the electric
dipole moment of M@C82 (M = La, Ce, Pr, Nd, and Gd)
estimated from their HPLC retention time determined by
the radiochromatography with a pyrenyl stationary phase.
The HPLC retention time of M@C82 on a pyrenyl stationary
phase is determined as 60.2 min for La, 60.9 min for Ce,
61.0 min for Pr, 61.0 min for Nd, and 62.2 min for Gd,
respectively. It is considered that logarithm of HPLC
retention time is proportional to the square of the electric
dipole moment because the separation of metallofullerenes,
which have large dipole, on a pyrenyl stationary phase is interms of the dispersion interaction and the dipole-induced
dipole interaction. The evaluated electric dipole moment− 149 −

of M@C82 is 5.1 D for Ce, 5.4 D for Pr, 4.5 D for Nd, and 6.3
D for Gd, respectively.
1P29 Extraction behavior of trivalent actinides with
HDEHP
TAKAYAMA, R.1, OOE, K.1, KOMORI, Y.1, FUJISAWA, H.1,
KURIYAMA, A.1, KIKUTANI, Y.1, KIKUNAGA, H.1,
YOSHIMURA, T.1, TAKAHASHI, N.1, SAITO, T.2,
MITSUGASHIRA, T.3, SHINOHARA, A.1(1Graduate School of Science, Osaka Univ., 2 Radioisotope
Research Center, Osaka Univ., 3Institute for Materials
Research, Tohoku Univ.)
The extraction behavior of trivalent actinides into di(2ethylhexyl)phosphoric acid (HDEHP) has been studied
together with a series of lanthanides.
The extraction of Am, Cm, Cf, and lanthanides (excludingPm) from 0.01 – 1 M nitric acid into 0.01 – 1 M HDEHP inbenzene was performed. The distribution ratios ofnonradioactive lanthanide isotopes were determined fromthe concentrations of metals in the aqueous phase and in
the organic phase (back extracted to aqueous solution)using ICP-MS, while those of the radioactive actinide andlanthanide isotopes (241Am, 243Cm, 249Cf, 139Ce, and 152Eu)
were obtained by γ-ray spectrometry with Ge detectors.
The distribution ratios of Am and Cf increased withdecreasing concentration of nitric acid and with increasing
concentration of HDEHP, and this behavior was similar tothat of lanthanides. However, the distribution ratios of Cm
showed different behavior from those of Am and Cf. In
this presentation, possible cause of the different behavior
observed will be discussed in addition to the systematics ofextraction behavior of trivalent actinides.
1P30 Synthesis and Structure of Uranyl (VI)
Complex Containing 2-Hydroxyisobutyrate
YOSHIMURA, T., KIKUNAGA, H., SHINOHARA, A.
(Grad. School of Sci. Osaka Univ.)
In this study, we report synthesis and structure of theuranyl (VI) 2-hydroxyisobutyrate complex. The complex
was obtained by the reaction of bis (acetato) dioxouranium
dihydrate with an excess amount of 2-hydroxyisobutyricacid in water. Uranium (VI) atom is seven-coordinate in apentagonal-bipyramidal structure. The two oxygen atoms
are located at the axial positions with a nearly linear O1-U1O2 angle. The equatorial positions are coordinated by fiveoxygen atoms of 2-hydroxyisobutyrate (HIB−) ligands.
Two kinds of HIB− ligands exist in the asymmetric unit.
One of the HIB− ligands links two uranium atoms by the
carboxyl group. The other chelates one uranium atom
through the hydroxy and carboxyl groups, moreover the
carboxyl group bridges the neighboring uranium atom. As
a result, a 2D polymeric structure is formed. The IR
spectrum showed stretching bands of the carboxyl groupof HIB− at 1614 and 1561 cm−1.
1P31 Cation-exchange behavior of Zr, Hf, and Th
in H2SO4/HNO3 mixed solutions – towards to study
on sulfate complexation of 104Rf
Z. J. Li1, A. TOYOSHIMA1, K. TSUKADA1, M. ASAI1, T. K.
SATO1, T. KIKUCHI1, N. SATO1, Y. NAGAME1(1Advanced Science Research Center, Japan Atomic Energy
Agency)Cation-exchange behavior of Zr, Hf, and Th in H2SO4/
HNO3 mixed solutions at [H+] = 1.0 M and [SO42-] = 4.1 ×
10-4 M has been studied by a batch method using theThecarrier-free radiotracers 88Zr, 175Hf, and 234Th.

adsorption sequence on cation-exchange resin is Th >> Hf> Zr. At [H+] = 1.0 M, the distribution coefficients (Kds) ofthese elements on the resin gradually decrease with anincrease of [HSO4-], indicating successive formation of
sulfate complexes. Further analysis of the slopes at each
[HSO4-] in the log Kd−log [HSO4-] plot shows that M(SO4)2+ and M (SO4)2 (M = Zr, Hf, and Th) are dominantaqueous species in 0.04−0.2 M [HSO4-]. At [SO42-] = 4.1 ×
10-4 M, the log Kd values linearly decrease with an increaseof log [H+], attributed to the displacement of these elementsfrom the resin by H+. On-line chromatographic behavior ofZr and Hf was also examined with a rapid chemical
separation apparatus using the 1.6 mm i.d. × 7.0 mm
micro-column. The reaction kinetics of Hf is fast, while thechemical equilibrium of Zr is not achieved. In the
symposium, the possibility of study on Rf sulfate complexes
will be discussed.
1P32 α-HiB complexation of Zr and Hf ashomologues of Rf.
KIKUCHI, T.1,2, TOYOSHIMA, A.2, LI, J.2, TSUKADA, K.2,
ASAI, M.2, SATO, T.2, SATO, N.2, NAGAME, Y.2,
KASAMATSU, Y.3, FAN, F. L.4(1Grad. School of Sci. and Eng., Ibaraki Univ., 2Advanced
Sci. Res. Center, JAEA, 3Nishina Center for Accelerator
Based science, RIKEN, 4Institute of Modern Phys., Chinese
Academy of Sci.)
The ion-exchange behavior of Zr and Hf in α-HiB /HNO3 mixed solutions has been studied by a batch method
using the carrier-free radiotracers 88Zr and 175Hf. It is foundthat the α-HiB complex formation of Zr and Hf reaches
equilibrium in 180 min and that the ion-exchange behaviorof these elements are basically similar to each other. The
distribution coefficients (Kd) of Zr and Hf on the cationexchange resin at [H+]eq = 0.1 M decrease with an increaseof [α-HiB -]eq, reflecting successive formation of α-HiB
complexes.
1P33 Development of liquid scintillation detector
for analysis of spent nuclear fuel
KIKUNAGA, H., YOSHIMURA, T., SHINOHARA, A.
(Grad. School of Sci. Osaka Univ.)
We plan to develop an on-line liquid scintillation detector
coupled to a capillary electrophoresis apparatus for analysisof spent nuclear fuel. In this work, we have developed aliquid scintillation detector with α/β discrimination andassessed its performances. From the results, it has beenfound that the liquid scintillation detector has a counting
efficiency of 99.6% and a FWHM of 192 keV for the 4784
keV α-peak of 226Ra. Next, a flow measurement system
which has two liquid scintillation detectors with U-shaped
glass cell connected to each other with 20 cm long of PTFE
tube was made. An emulsifier scintillator including 241Am
and 152Eu was passed through the detector cell to measure
the activities under flow condition and all events wereregistered in an event-by-event mode in the measurement.
Although the flow measurement was successful, peaktailing caused by high viscosity of the emulsifier scintillator
was observed.

− 150 −

1P34 Production rate of Pm-146 via proton capture
reaction
KINOSHITA, N1., MORITA, Y2., ARAKI, M3., YOKOYAMA,
A4., TAKAHASHI, N5.
(1Tandem Accelerator Complex, Univ. of Tsukuba, 2Facultyof Sci., Kanazawa Univ., 3Grad. School of Nat. Sci. Tech.,Kanazawa Univ., 4Inst. of Sci. and Eng., Kanazawa Univ.,
5
Grad School of Sci. Osaka Univ.)
P-nuclei, which are heavy nuclei of neutron-deficiency,
are considered to be synthesized in supernovae under atemperature of T>109 K mainly via proton capture and/or
neutron emission. The 146Sm nuclide, one of the p-nuclei
and also an extinct nuclide, has been known to be abundantin the early solar system based on isotopic anomaly of its
daughter nuclide in meteorites.
For estimation in
nucleosynthesis, spectra of particles and photons asfunctions of temperature and energy are used to calculate
the rates of relevant nuclear reactions. Besides, crosssections of the reactions are also important to estimate theproduction rate of a particular path for a nuclide. In thiswork, we focus on the 146Nd (p, n) 146Pm reaction for a pathof nucleosynthesis to 146Sm. Cross sections of the reaction
have been determined for the energy range of astrophysicalimportance. For that purpose, proton beam was introduced
to the target stack made of isotope-enriched material of146
Nd deposited on highly pure aluminum foils by molecular
plating. And the radioactivities from the reaction have been
determined by gamma-ray spectrometry. The obtained
cross sections are compared with those estimated with the
NON-SMOKER and the ALICE calculations. By using therelationship between temperature and production rate, themain path for nucleosynthesis to 146Sm is discussed withthe help of the estimate of the NON-SMOKER calculations
including those for the other nuclear reactions.
1P35 Excitation Function for Fusion Reaction of
the O-16 Projectile with a Deformed Nucleus of Tb159
KAIYA, H.1, ARAI, M.1, ASANO, A.1, NISHIKAWA, M.1,
OOE,K.2,KIKUNAGA,H.2,TAKAHASHI,N.2,YOKOYAMA,
A.3(1Grad. School Nat. Sci. Tech., Kanazawa Univ., 2Grad.
School Sci., Osaka Univ., 3Inst. Sci. Eng., Kanazawa Univ.)
In order to study nuclear fusion of deformed nuclei withheavy ions, we focus on lanthanoid targets, which are
known to be deformed as actinoids. We have performed
an experiment for the synthesis of heavy elements with159
Tb target and 16O projectile. The evaporation residue
cross sections were measured by using a stack techniqueand a gas-jet technique. The cross sections derived fromradioactivities of the products were compared with thetheoretical values calculated by ALICE code, in which a
spherical nucleus is assumed.
We compared theexperimental values and the theoretical values to discussparameters influencing the reaction mechanisms.
1P36 Magnetic properties of Co and Fe codoped
SnO2 powders by sol-gel method.
NOMURA, K1., OKAMURA, K.2, YAMADA, K.2(1School of Engineering The University of Tokyo., 2Tokyo
University of Science.)
SnO2 powders doped with various Fe3+ and Co2+ ionswere prepared by a sol-gel method. The structure andmagnetic properties were characterized by XRD, VSM,
and Mössbauer spectroscopy. The rutile types of SnO2
were determined for all samples.
The higher Co

concentration, the smaller the lattice is, whereas the higher
Fe concentration, the larger the lattice is. The ratio of thelatticeconstant,c/a,becamethesmallestforSn0.98 Co0.01 Fe0.01
O2, which might induce the highest magnetic anisotropy.
The hysteresis loops showed the magnetic moment withthe maximum 0.121μB/Co, Fe and with the less coercivity.
On the other hand, the coercivity for Sn0.98.5 Co0.005 Fe0.01 O2
showed the large value of 1300kOe. Mössbauer spectra
consist of two doublets and a sextet. The intensity of sextet
decreased with increasing Co concentration. It suggeststhat the magnetic interaction of doped Fe ions weakened
with Co concentration. It is considered that doublet peakwith large QS is due to Fe3+ close to oxygen defect, whereas
doublet peak with small QS is due to Fe3+ substituted to Snsites.
1P37 Mössbauer study of two-step spin-crossoverin Fe (II) complexes of imidazole-containing ligands
IIJIMA, S.1, HIRATA, Y.1, YABUKI, S.1, SATO, T.2, NISHI,
K.2, MATSUMOTO, N.2, KAWAMOTO, R.3, FUJITA, K.3,
MARUYAMA, H.3, KOJIMA, M.3(1Natl. Inst. Adv. Ind. Sci. Technol., 2Res. Inst. Natl. Sci.,
Kumamoto Univ., 3Faculty of Sci., Okayama Univ.)
Spin-crossover (SCO) phenomena in some Fe (II)complexes of imidazole-containing ligands were
investigated by 57Fe Mössbauer spectroscopy. Complexes[Fe (H2L2-Me)2] Cl･X showed different temperature profilesof high-spin (HS) molar ratio depending on the size of thecounter anion X (H2L2-Me = ((2-methylimidazol-4-yl)
methylidene) histamine). A two-step SCO transition wasobserved for the complex with ClO4- as X-, where anintermediate 1/2(LS-FeII + HS-FeII) state was detected
between ca. 100 and 200 K (LS = low-spin). On the other
hand, the complex with PF6- exhibited a sharp one-step
SCO transition around 200 K. The dinuclear Fe (II)complex [Fe2 (H2Lʼ)3](ClO4)4 of the similar ligand Lʼ =imidazole-4-carbaldehyde azine showed LS-FeII + HS-FeII
state below 180 K, and a sharp one-step SCO transition to
LS-FeII + HS-FeII state was observed above the temperature.
The line-widths of the Mössbauer absorptions and thetemperature dependence of the quadrupole splittingssuggested that the two Fe sites in [Fe2 (H2Lʼ)3] (ClO4)4 arenot equivalent.
1P38 Syntheses of Mixed Cr ystals of Assembled
Iron Complexes and Their Spin States (II)DOTE, H1., INOUE, K.1, NAKASHIMA, S.2(Grad. School Sci., Hiroshima Univ.1 N-BARD, Hiroshima
Univ.2)
We have studied spin-crossover behavior of assembled
complexes. In particular, Fe (NCX)2 (bpp)2 (X=S, Se, BH3;
bpp=1,3-bis (4-pyridyl) propane) has very rare structure
which is 2D interpenetrated, and Fe (NCBH3)2 (bpp)2
shows spin-crossover behavior. While Fe (NCX)2 (bpp)2•2(benzene) has 1D chain structure and shows temperatureindependent Fe (II) HS state. In the present study, we
performed mixed metals experiment to identify thecharacter of assembled complexes enclathrating benzene
molecules.
The structures of complex Fe (Co) (NCX)2 (bpp)2 •2(benzene) are shown to be similar to those of Fe (NCX)2(bpp)2 • 2(benzene) by powder and/or single crystal Xray crystallography. The Mössbauer parameters of Fe(Co) (NCX)2 (bpp)2 • 2(benzene) are similar to those of Fe(NCX)2 (bpp)2 • 2(benzene), suggesting no effect of mixed
crystals. And we are now studying the effect of desolvation− 151 −

of benzene molecules in the mixed crystals.
1P39 Preparations and cr ystal structures foruranyl (VI) coordination compounds with chelate
ligands
KITAZAWA, T., KAWASAKI, T.
(Faculty of Science, Toho Univ.)
Actinoid chemistry is highly related to the reprocessingof nuclear fuels and treatment of actioid wastes in thebackend chemistry of todayʼs operating nuclear power
plant. The fundamental research of the coordination
chemistry of uranium complexes allows important
information in the field of the backend chemistry. We
report herein the synthesis and structures of the newuranyl (VI) coordination compounds with various chelate
ligands. The chelate ligands allow 7, 8 and 9 coordination
environments.
1P40 Development of real-time RI imaging systemfor plant nutrient uptake
NAKANISHI, T.M., YAMAWAKI, M., KANNNO, S.,
ISHIBASHI, H., TANOI, K.
(Grad. School of Agricultural & Life Sci., The Univ. ofTokyo)
It is very important to visualize how nutrients are taken
up by the plant. We developed real-time imaging systemusing conventional beta-ray emitters, 32P, 35S, 45Ca, as well
as 14C, except for 3H. The sample was placed in a box
where light was irradiated only at an above-ground part ofthe plant and the roots were kept in dark. Therefore, it wasable to prepare cyclic light and dark condition. The betarays emitted from the sample were converted to light by a
CsI scintilator, which was deposited on FOS (fiber optic
plate). After amplification, the light was focused by a lens
and was guided to a highly sensitive CCD camera. The
image was integrated every 3 minutes, successively. The
sensitivity of the imaging was more than ten times higher
than that of an imaging plate (IP), with similar resolution.
When the chemicals labeled with radioisotopes wereapplied, it was able to image how these chemicals weretaken up by the root as well as translocation andaccumulation manner to the above-ground part. In thecase of 32P-phosphate, it was found that there was always apreference of translocation to younger tissues in a soybean,
rice and other plants.
2S01 Utilization of Radiation – Present and Future
Perspective
SHIBATA, T(J-PARC Center, Japan Atomic Energy Agency)
The radiation and radio-nuclei are wildly used in variety
of fields such as research, industrial, agriculture, andmedical fields. The economic scale of utilization ofradiation and radio-nuclei is the same order of the nuclear
power. The future expansion of the radiation usage
depends on 1) the extension of neutron- and muon-beam
application to wider range of fields, 2) the development offood irradiation to prevent the loss of foods for the future
global food problem, 3) development of small neutron
sources for usage of neutron beam in the industrial filed, 4)
to establish an stable RI supply system in Japan, and 5) an
introduction of a reasonable pharmaceutical approvalsystem.

2S02 Nuclear Energy Research and Development-Current Status and FutureTANAKA, S.
(School of Engineering, The University of Tokyo)
Nuclear energy is evaluated as a sustainable energy
source. It is indispensable form the viewpoints ofenvironmental protection and energy sustainability. At
present there are 53 nuclear power plants with total
capacity of 47.9GWe in Japan. “Framework for Nuclear
Energy Policy”, which was decided by Atomic Energy
Commission in 2005 described three important nuclear
policies: ① 30 – 40 % or more of the total electricity
production by nuclear even after 2030, ② recycling as thebasic nuclear policy, and ③ commercial FBR should be
introduced around 2050. For the recycling policy, earlyand steady operation of Rokkasho Reprocessing Plant isvitally important.
Plutonium utilization in LWR isconsidered as an important first step to effective utilizationof nuclear fuel. Disposal of high level radioactive waste isalso important to secure nuclear energy utilization. In
addition to effective site selection process with public
acceptance, fundamental science to improve accuracy of
performance assessment is continuously important. For
maximum utilization of uranium resources, FBR cycle ismost effective. R&Dʼs for demonstration reactor withreprocessing and fuel manufacturing are actively carriedout. Considering worldwide increase of nuclear energy inmany countries, nonproliferation (safeguards) and nuclear
security are becoming more important.
Nuclear chemistry should continue to play an importantrole in many aspects of nuclear energy research anddevelopment.
2S03 Superheavy element chemistr y -Frontiers
opened by a recoil separatorHABA, H.
(RIKEN Nishina Center)
Chemical characterization of superheavy elements(SHEs) with atomic numbers Z ≥ 104 is an extremelyinteresting and challenging subject in modern nuclear andradiochemistry. Recently, a gas-jet transport system forSHE chemistry has been coupled to the gas-filled recoil
ion separator GARIS at the RIKEN Linear Accelerator. We
have systematically investigated the performance of thesystem using 206Fr, 245Fm, 255No, 261Rf, and 265Sg produced in
the 169Tm (40Ar, 3n), 208Pb (40Ar, 3n), 238U (22Ne, 5n), 248Cm(18O,5n), and 248Cm (22Ne, 5n) reactions, respectively.
Alpha-particles of these nuclides separated with GARIS
and extracted to a chemistry laboratory were successfully
identified with the rotating wheel system MANON for αspectrometry under low background conditions. The highgas-jet efficiencies of over 50% were found to be independentof the beam intensities up to several particle μA. These
results demonstrate that the present system is a promising
approach for exploring new frontiers in SHE chemistry: (i)the background radioactivities of unwanted reaction
products are strongly suppressed, (ii) the intense beam isabsent in the gas-jet chamber and hence high gas-jet
efficiency is achieved, and (iii) the beam-free condition
also allows for investigations of new chemical systems. In
the symposium, a chemistry program at RIKEN will bealso presented referring to new chemistry apparatuses
such as a gas-chromatograph column directly coupled to
GARIS and a micro-chemical device for ion exchange andsolvent extraction.

− 152 −

2S04 Status and perspectives of muon science at
MUSE in J-PARC
NINOMIYA, K1.
(1Advanced Science Research Center, Japan Atomic Energy
Agency)The new muon science facility (MUSE) at the MLF(Material and Life Science Experimental Facility) in JPARC (Japan Proton Accelerator Research Complex) has
started to supply muon beam for the general users. At
MUSE in J-PARC, the 3 GeV 333 μA (1 MW) proton
primary beam will be supplied. It is the worldʼs strongest
pulsed muon beam source. Two experimental beam ports
are now in ready at MUSE (D1 and D2 ports). In the D1port, the measuring system for muon spin rotation,
relaxation, resonance (μSR) method is equipped. Other
experiments, such as fundamental studies for elemental
analysis by using negative muon, can be performed in theD2-port. In this paper, the status and the new project ofmuon science at MUSE will be shown.
2S05 The use of synchrotron-based technique foractinide research
IKEDA-OHNO, A.
(Synchrotron Radiation Research Unit (SPring-8), Japan
Atomic Energy Agency)
Synchrotron-based analytical methods, such as X-ray
absorption spectroscopy (XAS) or X-ray scattering (XS),
have recently been recognized as a very powerful tool toinvestigate the solution / coordination chemistry ofchemical substances. These methods have also been
applied to the basic- and applied research concerning theactinide species in solution. In this talk, several recent
topics related to the actinide speciation study usingsynchrotrons will be presented, as well as the prospect andfuture subjects of this research field.
2S06 Application of Mössbauer spectra in the metal
complexes
HAYAMI, S.
(Grad. School of Sci. and Tec. Dept. of Chem., Kumamoto
Univ.)
The complexes have been attracted attention from theviewpoint of the functionality based on the dynamic
electron states. The dynamic electronic states such as thespin states or the oxidation states in the metal complexes
develop functions, i.e. spin-crossover, mixed-valence,
thermochromism, valence tautomerism, magnetism,conductivity, and so on. In the study for the spin-crossoverand mixed valence compounds, iron compounds have been
investigated mainly, and 57Fe Mössbauer spectroscopy isconvincing measurement means. In this time, The
importance of 57Fe Mössbauer spectroscopy for the metal
complexes with dynamic electron states and the future
development will be discussed.
2S07 Radiochemistr y and basic research onradioactive waste disposal and reprocessing
Kirishima, A.
(Institute of Multidisciplinary Research for Advanced
Materials, Tohoku University)
Basic researches on the back-end engineering of nuclear
fuel cycle including radioactive waste disposal and spent
fuel reprocessing are conducted at IMRAM, Tohoku
university. In this presentation, three research topics
currently conducted are introduced. The first one is“Thermodynamic study on the U complexation withcarboxylic acids by micro calorimetry”. In this study, ∆G,∆H and ∆S of U (VI) complexation with carboxylic acids
were determined by the calorimetric titration techniques.
These data help the deeper understanding of the reaction
mechanism. The second topic is “Simplified Modelling of
the Complexation of Humic Substance”. For the predictionof chemical species distribution in the system containing
humic substances, a simplified complexation model is
proposed in this study. The proposed model consists ofthe minimized number of parameters to reproduce theobserved complexation behaviour of humic substances.
The third topic is “Development of Spent Fuel Reprocessing
Process based on Selective Sulfurization”. A novel
reprocessing process based on selective sulfurization offission products is proposed. The key concept of thisprocess is utilization of unique chemical property of carbon
disulfide, i.e., it works as a reductant for U but works as asulfurizing agent for minor actinides and fission products.
The basic validity of this simple semi-dry reprocessing
process having advantages of low radioactive waste volume
and risk of the nuclear proliferation is investigated.
2S08 Present Research and Prospects ofEnvironmental Radioactivity
KAKIUCHI, H.
(Dep. of Radioeco. Inst. for Environ. Sci.)
Environmental radioactivity research has been done
mainly to clarify the distribution and migration behavior ofradionuclides in the environment. Nuclear tests in theatmosphere have been suspended more than 40 years, andthe accident of the Chernobyl NPP was passed over 20
years. The moratoriums on unfortunate accidents make it
hard to detect its effects now. On the other hand,assessment of an normal release of radionuclides is needed
to confirm the safety of residents living near nuclear
facilities. We are needed to improve technique for moreaccurate analysis of radionuclides.
2S09 Radionuclide therapy: A interdisciplinar yfield of nuclear medicine and radiochemistr y
WASHIYAMA, K.
(1College of Medical, Pharmaceutical and Health Sciences,
Kanazawa University)
Radionuclide therapy is one of the fields of nuclear
medicine and it uses tumor specific antibody, and/or
peptide that labeled with charged-particle (α particle,
β− particle, Auger electron) emitted radionuclide fortreatment of tumors. Beta-emitters, such as 89Sr, 90Y, 131I
have been used for clinical field in Japan, and 32P, 153Sm,
186
Re have been used in the USA and Europe. These
nuclides have suitable half-life and potent β− particles.
Due to the physical character and attached antibody,
yttrium-90 is the first radioimmunotherapeutic agent
approved for the treatment of refractory non-Hodgkins
lymphoma. Alpha-particles are radiations of high LET.
Therefore, the cytotoxicity that induced by α- particles
are far more potent than low LET β− particles. Due to theshort range of α-particles in tissue, α-emitting
radionuclides are suited for targeting micrometastases andsingle tumor cells. Therefore, astatine-211, 213Bi, 223Ra, and225
Ac have used for clinical trial of leukemia, melanoma,bone metastases, and so on. Other α-emitting radionuclides
such as 149Tb, 212Bi, 226Th, 227Th, 230U are also promising fortumor therapy. Especially, radium-223, 225Ac, 227Th, and230
U are the parent of decay chain nuclides. These nuclides
act as in vivo generator and emit more potent radiation to− 153 −

tumor than single α-, β−-particle emission.
2S10 A study of isotope ratio measurement of
ultra-trace nuclear materials in environmental
samples
SAITO-KOKUBU, Y.
(JAEA)Uranium and plutonium of nuclear materials consist of
several isotopes. Since their isotopic compositions dependon their origin, their isotope ratios are an effective tool forthe identification of the source of uranium and plutonium.
In this study, analytical techniques of isotope ratio
measurement of ultra-trace nuclear materials weredeveloped and applied to measure isotope ratio of plutonium
in sediments and soils collected around Nagasaki city andenvironmental sample analysis for safeguards.
Ratios of 240Pu/239Pu and concentrations of 239+240Pu in asediment core and surface soils collected around the
hypocenter of Nagasaki atomic bomb were determined to
identify plutonium released from Nagasaki atomic bomb.
Depth profiles of the ratio and the concentration in thesediment core indicated depositional record of plutonium
released from the atomic bomb for 60 years. The results ofratio of 240Pu/239Pu in the soils allowed us to identify
geographical distribution of the plutonium released fromthe atomic bomb.
JAEA has carried out environmental sample analysis for
safeguards. A procedure of a chemical separation and amethod for measurement of isotope ratio in particulate
nuclear materials by TIMS were developed in order toresolve the problems of analytical technique and supply
the analytical demand of actual samples.
2S11 Synchrotron-based X-ray absorption study on
actinide complexes in solution
IKEDA-OHNO, A.
(Synchrotron Radiation Research Unit (SPring-8), Japan
Atomic Energy Agency)
As compared to typical transition metals, the solution/
coordination chemistry of actinides (An) is very unique
because of their chemical similarity in the series, as well as
their diversity of oxidation states from III to VII. The
complex structure of chemical species in solution is thefundamental information to grasp the chemical properties
of An in solution. However, conventional analyticaltechnique, such as UV-visible or IR absorption, or NMR
spectroscopy, provides no direct information on the
structural arrangement of solution species. In this study,
the structural identity of An species with different oxidation
states has been determined in various aqueous solutions
by means of synchrotron-based X-ray absorption
spectroscopy. The comparison of the obtained results withother reported data provides us several comprehensive
trends of the chemical properties of An in aqueous solution.
For instance, tri- and tetravalent An exist as a sphericalcation of Ann+, while penta- and hexavalent An are forminga transdioxo complex of AnO2m+. Besides, the highest
oxidation state of heptavalent An exists as a negativelycharged square-planar-tetraoxo complex, AnO4–. Thismeans that the effective charge of An in solution iscompletely different from their original charge, anddecreased in the following order; An4+ (IV) > An3+ (III) >AnO22+ (VI) > AnO2+ (V) > AnO4– (VII).

2S12 Radiochemical Study on Photonuclear
Reaction Mechanism at Intermediate Energies
Sakamoto, K.
(Kanazawa Univ.)
I am greatly honored to receive the Kimura Award fromthe Japan Society of Nuclear and Radiochemical Sciences.
I offer my sincerest gratitude to my mentors during late1960s, the late Professors, Dr.Paul K.Kuroda and Dr.Sigeo
Tanaka who were the former students of Prof. Kimura at
the Univ.of Tokyo. My sincere thanks go to the award
committee of JSNRS and especially the supporters who
nominated me. The work to be presented here has been
performed by the collaboration with more than 50 BS,MSand PhD students who passed my lab. and Proffesors, Dr.
I. Fujiwara, Dr, S. Shibata, Dr. M. Furukawa and others,withwhom the Award be shared.
Our study on photonuclear reactions has been on target
nuclei ranging from 7Li to 209Bi at intermediate energies, i.
e. bremsstrahlung with the end-point energies of E0=301200 MeV. Irradiation has been performed at the 300MeVElectron LINAC of Tohoku Univ.,the 1.3 GeV Electron
Synchrotron of Institute for Nuclear Study,the Univ. ofTokyo (INS, Now KEK), and partly the 600 MeV Electron
LINAC of the Electrotechnical Lab. The study covered theradiochemical yield measurements of photospallation,phot
opion reactions, photofragmentation, and photofissions ofpreactinides, 197Au and 209Bi, systematically performed withrespect to photon-energy, target mass (At) and/or target
composition (N/Z)t, product mass (A) and productcomposition (N/Z). Such a thorough study had not existed
in this field, Thousands of the yield data were compiled
and found to be smoothly varying functions of theseparameters. And the relevant empirical expressions forthe reaction yields were derived. The data for the four
reaction channels above 140 MeV indicate clear shapes ofΔ(1232)-resonance and strong effects of the nuclear
medium on the cascade-evaporation process in nuclei with
At higher than 110-130 or (N/Z)t larger than 1.3-1.4. All
the results have been updatedly used to test Monte Carlocalculations based on the photon-induced intranuclear
cascade and evaporation analysis (PICA) code and its
improved versions,and the degrees of the validity of thecodes have been demonstrated. New implications fornuclear structure and reaction mechanism have been
disscussed by referring to the nuclear models, on which
the calculations are based. Kinematic information fromadditional experiments performed on several targets at the
Δ-resonance region has supported the findings from theyield measurements. The results of the yield measurements
and the chracteristic features of the four channels are
explained separately, though these channels arecompetitive. Important consequences and perspectives of
the work are pointed out relevantly. Some detals are given
in J. Nucl. Radiochem, Sci., vol.4, no.2, pp.A9-A31 (2003).
3A01 Prompt Gamma-ray analysis on J-PARC
NOBORU
MATSUE H1., KASUGAI Y2., HARADA M2., MAEKAWA
F2., KUBO K3., SAITO T4.
(1Quantum Beam Science Directorate, JAEA, 2J-PARC
Center, JAEA, 3International Christian University, 4National
Museum of Japanese History)
The neutron beam line of NOBORU (BL10) in J-PARC
has high flexibility for experimental arrangements. The
neutron induced prompt gamma-ray analysis (PGA) system
was developed on NOBORU. A germanium detector was− 154 −

used as the gamma-ray spectrometers. The gamma-ray
spectrometers of germanium detectors and the dataacquisition systems for energy and TOF spectra are
prepared. In the experiment, we had PGA data of somematerials, such as boron, gold, silver, indium, tantalumetc., and, as trial, we obtained the PGA data of a “Koban”,
which is a gold coin used in the old days in Japan, and thecomponent fraction of gold and silver in the coin could beanalyzed.
3A02 Identification method of ores used for theradiation source in NORM.
FURUTA, E.1, MINOWA, H.2, NAKAHARA, H.3, IWAOKA,
K.4, YONEHARA, H.4(1Ochanomizu Univ., 2Jikei Univ. School of Medicine,3
Tokyo Metropolitan Univ., 4National Institute ofRadiological Sciences)
NORM stands for Naturally Occurring Radioactive
Material. In this study, NORM means only consumer
products. The existence of NORM in our environment
raises the radiation exposure dose of the users. This has
become a world-wide issue. The sources of NORM aremainly radionuclides in the thorium (Th) and uranium (U)series. However, we have little information about the kindsof ores which are added to NORM. It is well-known thatTh and U nuclides usually exist with rare earth elements inores. So we sought a new method for identifying the kindsof ores added to the NORM from the correlation of theconcentration ratios of the Th/U and the Gd/Sm in NORM
and ores. The conventional γ-ray spectrometry by a Ge
detector for analysis of Th and U and the prompt gammaray activation analysis for the determination of Sm and Gd
were employed. It was found that the radiation sources of
NORM of the consumer products in recent markets weremainly monazite and tourmaline. This method is found tobe very useful to identify the ores used for the radiation
source in NORM.
3A03 Estimation of the anthropogenic matter ratioof dust particles trapped in snow core
SHOZUGAWA, K.,1 MATSUO, M.,1 OSHIMA, M.,2 TOH,
Y.,2 KIMURA, A.,2 KOIZUMI, M.2(1Graduate School of Arts and Sciences, The University ofTokyo, 2Innovative Nuclear Science Research Group,
JAEA)
The anthropogenic matters in air, known as dust
particles originated in fuel combustion and refining metals,
were trapped in snow during winter season at themountainous areas. By using the Enrichment Factors(EF) of the elements contained in the dust particles insnow samples, we have evaluated the rate of theanthropogenic matters to soil particles. Analyzing dust
particles trapped in snow has a difficulty because of low
concentrations of elements and high matrix in insoluble
matters. Thus, by applying multiple prompt gamma-ray
analysis (MPGA) in addition to INAA, measurements oftrace elements which were below the detection limit byconventional methods can be expected.
The snow samples were collected about 1,000g in 20072008 winter season at domestic mountainous areas such as
Maruyama (Niigata pref.), the peaks of Tateyama (Toyama
and Nagano pref.) and Konsei-pass (Tochigi and Gunma
pref.). Samples were melted at room temperature, anddivided into two aliquots and deposited on membrane filter
under a simple clean chamber. γ-γ ray measurements
were performed using 24 germanium semiconductor

detectors, and measurement for 3,600 sec. was repeated 5
times for every sample. By sorting of each list data, andcalculating two-dimensional matrices, the measurement
for integration time from 3,600 sec. to 18,000 sec. wereobtained. In addition, since the net weight of the dust
samples on a filter paper was difficult to measure, EF was
calculated from the weight value acquired from comparison
with some standard reference materials.
At Murodo, both EFZn and EFV showed that measurementfor 3,600 sec. had large errors, and sufficient accuracies
were not acquired. The results of 10,800 sec. or more wereconsistent with the results of INAA. Therefore, at least
10,800 sec. for these dust samples were required formeasuring time. EFZn at Murodo indicated about 40,
suggesting large effect of anthropogenic activity such as
diesel emission from snowplow. The EFV indicated very
lower values than EFZn at both points; this is explained interms that particulate matters including vanadium havedissolved into snow. In addition, we will report the ratio of
sulfide to sulfate in dust samples, which obtained by XAFS
measurements.
3A04 Application of multiple prompt gamma ray
analysis (MPGA) to geochemical and cosmochemical
samples
WATANABE, R.1, OURA, Y.1, EBIHARA, M.1, OSHIMA,
M.2, TOH, Y.2, KIMURA, A.2, KOIZUMI, M.2, FURUTAKA,
K.2, MURAKAMI, Y.2(1Grad. School of Sci. and Eng., Tokyo Metropolitan Univ.,
2
JAEA)
The multiple prompt gamma-ray analysis (MPGA) is a
prompt gamma-ray analysis (PGA) coupled withcoincidence counting method using multiple Ge detectors.
We studied some conditions for obtaining accurateelemental concentrations in cosmochemical andgeochemical samples by MPGA. Reproducibility ofcounting rates during about 1 day was good and S/N ratioof gamma-ray peaks obtained by sorting using
anticoincidence method was about 2 times higher thannormal method. We chose 150 – 200 mg of sample asappropriate amount of sample to be analyzed because S/Nratio was increased with an amount of sample up to about
150 mg and S/N ratios are almost same at larger than 150
mg of sample. Determination of Si, Ti, and Fe in Allendeand Gold Basin meteorites was tried under suitableconditions obtained in this study, and the concentration
values by MPGA were found to be consistent with literature
values.
3A05 Determination of trace lanthanoids in ureilite
meteorites by radiochemical neutron activation
analysis
AIHARA, H., OURA, Y., EBIHARA, M.
(Grad. School of Sci. and Eng., Tokyo Metropolitan Univ.)
Lanthanoids (Rare earth elements; REEs) are a group ofelements whose abundances contribute the mostsignificantly in geochemistry and cosmochemistry. In thisstudy, we aimed to determine REEs in several ureilites byradiochemical neutron activation analysis (RNAA). To
obtain accurate data of REEs, the contribution of neutroninduced fission reaction of 235U to light REEs (LREEs) was
seriously considered and tried to be properly collected.
Ureilite meteorites as well as the Allende meteorite anda peridotite geostandard samples JP-1 were analyzed inthis study. These samples were irradiated with neutrons in
the JRR-3 reactor of Japan Atomic Energy Agency. The− 155 −RNAA procedure was mostly based on that described by
Minowa and Ebihara (2003) [1].
Ten REEs (La, Ce, Nd, Sm, Eu, Gd, Tb, Tm, Yb and Lu)
were able to be determined. CI Chondrite-normalized
REE abundances for ureilites show either so-called Vshaped pattern or LREE-depleted pattern. As 140La, 141Ceand 147Nd are produced by neutron-induced fission reaction
on 235U in addition to neutron-capture reaction of individual
target nuclides (139La, 140Ce and 146Nd, respectively), theircontributions were estimated and corrected for. As JP-1
has high U/LREEs ratios, collections reach 4%, 21% and
25% for La, Ce and Nd, respectively.
[1] H. Minowa and M. Ebihara, Anal. Chim. Acta 498(2003) 25.
3A06 Activity ratio of 230Th/232Th in the products
from Asama volcano, Japan
KURIHARA, Y.1, Takahashi, M.2, SATO, J.3(1Org. Strategic Coordinat. Res. Intellect. Prop., Meiji
Univ., 2Cent. Res. Inst. Electr. Power Industry, 3Meiji
Univ.)The generation of magmas at the subduction zone is
generally inferred to be induced by the partial melting of
the mantle wedge by the addition of fluid derived from thesubducting plate. Observations were carried out on theradioactive disequilibria between 238U and 230Th in the
products (4th C, 1108 and 1783 eruptions) from Asama
volcano, Japan. Measurement of activity concentrations
and activity ratios of U and Th isotopes in the samples wasmade by isotope dilution analysis coupled with alpha-ray
spectrometry. Activity ratios of 238U/230Th in the products
were greater than unity, being enriched in 238U relative to
230
Th, which was often observed for fresh products from
subduction zone volcanoes. The 230Th/232Th activity ratio
in the products from Asama volcano and from Izu-Mariana
arc volcanoes ranged from 0.91 to 0.95 and from 1.02 to
1.67, respectively, and the 238U/232Th activity ratio ranged
from 0.98 to 1.16 and from 1.09 to 2.81, respectively. The(230Th/232Th)-(238U/232Th) data set for Asama volcano
formed a cluster on the diagram, while those of Izu-Mariana
arc volcanoes formed another cluster apparently apartfrom each other, suggesting that the 230Th/232Th (=238
U/232Th) activity ratio in the magma source may possibly
be different between these volcanoes.
3A07 Study on dynamics and sources of POC inriver systems using 14C as a tracer
NAGAO, S1., ARAMAKI, T.2, IRINO, T.3, UCHIDA, M.2,
SHIBATA, Y2., TOGAWA, O.4(1INET, Kanazawa Univ., 2Enviorn. Chem. Divi., NIES,
3
Fac. of Environ. Earth Sci., Hokkaido Univ., 4Nucl. Sci.
Eng. Direct., Japan Atomic Energy Agency)
In order to understand transport behavior of particulateorganic matter (POM) in river systems, we studied
characteristics of POM in seven rivers with different
watershed conditions. River water samples were collected
at a station in lower region each river. The suspended
solids (SS) were concentrated from river waters using asingle-bowl continuous flow centrifugation. The SS
samples were measured for organic carbon content, ∆14C
and δ13C values. The ∆14C of POC ranges from –296 to+20‰. On the basis of ∆14C-δ13C plots, carbon isotopic
signatures can be divided into three groups. These results
indicate that ∆14C and δ13C values of POC depend on
watershed conditions and sources of riverine POC.

3A08 Separation of dissolved 85Kr in groundwater
Ohta, T.1, Mahara, Y.1, Momoshima, N.2, Inoue, F.3, Ikawa,
R.4, Shimada, J.5 Kubota, T.1, Taniguchi, M.6(1RRI, Kyoto Univ., 2RIC, Kyushu Univ., 3Dep. Chem.,
Fac. Sci., Kyushu Univ., 4AIST, 5Fac. Sci., Kumamoto
Univ., 6RIHN)
We investigated extraction of the 85Kr from groundwater
having an ultra-low concentration with a Kr-extraction
system using a hollow fiber membrane. Our aim was todevelop a system able to effectively extract Kr isotopes
from a large volume of groundwater (104 L) in field studies
for measurement of 85Kr radioactivity. Before testing our
Kr-extraction system in the field, we investigated theefficiency of Kr extraction from water by extracting trace
amounts of Kr in the laboratory. This extraction method
can be applied to 104 L of water, though a flow velocity at 24
L/min is preferable. We then used our method to extract85
Kr from groundwater at field, Japan. We showed herethat Kr isotopes, which reflect residence time ofgroundwater, can easily be obtained by the system.
3A09 Sequential ion-exchange separation andanalysis of trace uranium, thorium, lead andlanthanides in environmental samples
MIYAMOTO, Y., YASUDA, K., MAGARA, M., KIMURA,
T.
(Nuclear Science and Engineering Directorate, JAEA)
Abundance and isotopic ratios of trace U, Th, Pb andlanthanides in a sample play a key role to investigate
features of the sample. From these ratios of the key
elements, information on origin and history of the sample
can be obtained. The key elements should be separated
from the co-existing and interfering elements in a sample
to analyze accurately the abundance and isotopic ratios of
the key elements by ICP-MS. In this work, nano grams ofU, Th, Pb and lanthanides in a geological reference rockwere sequentially separated with a single anion-exchange
column. Mixture of CH3COOH, HCl and HNO3 were usedas the eluents for this separation. For the Th separation,
22 ml of the mixture of 70% CH3COOH and 1 M HCl was
effective. By addition of 0.005 M HF to the eluents, therecoveries of Th and U were improved. Alkaline metals,
alkaline earth metals and Fe were effectively eliminatedfrom the key elements. By using this technique, it ispossible to simplify the complicated traditional processes
without any special ligands, columns and equipments.
3A10 Distribution of 241Am concentration in watercolumn of eastern Pacific in 2003
NAGAOKA, M.1, SUMI, T.1, KINOSHITA, N.2, YOKOYAMA,
A.3, NAKANISHI, T.3(1Grad. School of Nat. Sci. Tech., Kanazawa Univ.,
2
Tandem Accelerator Complex, Univ. Tukuba, 3Inst. of Sci.
Eng., Kanazawa Univ.)
Americium-241 (T1/2 = 432.2 yr) profiles have been
determined in the eastern Pacific in 2003. The vertical
distribution of 241Am showed similar pattern to those of239, 240
Pu (T1/2 ＝ 2.41×104 yr, 6.56×103 yr). The activity
ratios of 241Am / 239,240Pu were low in surface and bottom
layer. It suggests that 241Am is scavenged from surface
more rapidly than 239, 240Pu and 239, 240Pu is redissolving fromsediment..

− 156 −

3A11 Determination of 226Ra by liquid scintillation
spectrometr y using 223Ra as yield tracer
UESUGI, M.1, HINAMI, S.1, YOKOYAMA, A.2, NAKANISHI,
T.2(1Grad. School Nat. Sci. Tech., Kanazawa Univ., 2Inst. Sci.
Eng., Kanazawa Univ.)
Drinking water or groundwater contains very small
amount of 226Ra. The preconcentration of radium isessential for the analysis of the nuclide in water sample. It
is well known that barium sulfate coprecipitates radium
quantitatively, but the amount of barium is limited inapplying liquid scintillation spectrometry or α-ray
spectrometry to count alpha-radioactivity of 226Ra. In thiswork, the preconcentration of Ra by hydroxyl apatite
coprecipitation, separation of Ra from Ca, and liquid
scintillation spectrometry were examined by using 223Ra asa yield tracer. The results are as follows: (1) 30 mg/L of
Ca2+ carrier can carry down more than 95% of radium intohydroxyl apatite, (2) by adding citrate, radium waseffectively separated from calcium by using cationexchange resin column, (3) by transferring cation exchange
resin which sorbed Ra into liquid scintillation vial and byadding liquid scintillator, 222Rn grown from 226Ra andextracted into scintillator was effectively counted by liquid
scintillation spectrometer.
3A12 Estimation of soil-to-plant transfer of radium226
TAGAMI, K., UCHIDA, S.
(National Institute of Radiological Sciences)
Among the environmental transfer parameters that havebeen used in the mathematical models for radiation dose
assessment for humans, soil-to-plant transfer factor (TF) isof importance. The parameter is calculated as the plant/
soil concentration ratio; however, for 226Ra, the number ofreported TFs is still limited due to the low concentration inplant samples. In this study, a statistical approach was used
to estimate TF-Ra instead of direct measurement of theradionuclide in plants and soils. The results showed highcorrelations between 226Ra and U concentrations in soils(r=0.816, p<0.001), and between 226Ra and Ba concentrations
in plants (r=0.887, p<0.001) in the Studentʼs t-test. Using
these results, TF-Ra could be estimated with good accuracy.
Indeed, the difference between estimated and measured
TF-Ra was within a factor of 2 for each crop species. The
method could estimate TF-Ra under the soil-to-plantsystems where no significant enhancements of U (226Ra)
and/or Ba concentrations in soil are expected. The
proposed empirical method could serve as a screen forpotential exposure to 226Ra from plant ingestion byhumans.
3A13 210Pb deposition in the Far East Asia
HIROSE, K.1, KIKAWADA, K.1, DOI, T.2, SU, C.-C.3,
YAMAMOTO, M.4(1Faculty of Sci. Technol., Sofia Univ., 2NIES, 3National
Taiwan Univ., 4LLRL, Kanazawa Univ.)
Our aim of this study is to have better understanding of
spatial and temporal variations of the 210Pb deposition in
the Far East Asia. To achieve our purpose, a comprehensive
data set of monthly 210Pb deposition, which includes several
time-series data and spatial distribution data in 13 stationsof Japan and 2 stations in Taiwan, was analyzed. The 210Pb
deposition in the Far East Asia exhibited a latitudinal
distribution. Especially, the Japan Sea side stations werecharacterized by anomalous high 210Pb deposition as

pointed out by Yamamoto et al., (2006). The 210Pb
depositions in the Far East Asia showed seasonal changewith high in winter having large geographical variability
and low in summer having small geographical variability.
We examine 210Pb deposition behaviors in winter andsummer, respectively. The results revealed that therelationship between the 210Pb deposition and precipitation
amounts in the Japan Sea side stations in winter differsfrom that in other sites whereas there is no difference ofthe 210Pb deposition behavior between sampling sites insummer. The 210Pb concentrations in rainwater in wintershowed inter-annual variability. This may be related toclimatological factors such as ENSO.
3B01 Production of Radioisotopes for Nuclear
medicine using fast neutron reactions
HATSUKAWA, Y., HASHIMOTO, M., NAGAI, Y., KIN, T.,
SEGAWA, M., HARADA, H., KONNO, C., OCHIAI, K.,
TAKAKURA, K.
(Japan Atomic Energy Agency)
99m
Tc is the most important radioisotope used as nuclear
medicine. The present world demand for 99Mo is about 450
TBq/week which is mostly produced by using only fivenuclear reactors in Canada, Belgium, France, Netherlands
and South Africa. Recently, two of the present authors
proposed a new route to produce 99Mo by the 100Mo (n, 2n)
99
Mo reaction, which has the following characteristicfeatures.1) First, the reaction cross section is large, about
1.5 barn at 12<En<17 MeV, which is 10 times larger than
the thermal-neutron capture cross section of 98Mo. Second,the cross sections of the (n, α), (n ,np), and (n, p) reactions
are less than a few mb at En = 14 MeV. Third, a large
amount of 100Mo target materials can be used, compared tothat for proton beam irradiation on 100Mo. Fourth, intense
neutrons with energy of 12-17MeV are already available.
In the present work we have measured all γ-rays emitted
from activities produced by bombarding a natural Mo
target with neutrons from the D (3H, n) 4He reaction at
Fusion Neutronics Source Facility (FNS) at Japan Atomic
Energy Agency (JAEA) to study characteristic features
mentioned above more in detail. The neutron flux was
about 1012 n/cm2s. The experimental results at FNS will be
discussed in the conference.
Reference
1) Y. Nagai and Y. Hatsukawa, J.Phys. Soc. Jpn 78, 033201(2009)
3B02 Production of rare earth multitracer fromnat
Hf target
Y. EZAKI, H. HABA, Y. KASAMATSU(RIKEN Nishina Center)
A multitracer including many radioisotopes of rare earth
elements (REEs) is very useful to simultaneously trace thebehavior of REEs under an identical experimental
condition. In this paper, we propose a novel method to
produce the REE multitracer using natHf as a target.
The natHf foil of 165 mg/cm2 in thickness was irradiatedwith a 135 MeV/nucl. 14N beam from the K540 RIKEN
Ring Cyclotron (RRC). The beam intensity was about 0.6
particle μA. For effective productions of short- and longlived radionuclides, two separate natHf targets were
irradiated for 0.5 h and 59 h, respectively. After theirradiations, the REEs were chemically separated throughcoprecipitations with calcium fluoride and iron hydroxide
followed by anion- and cation-exchange methods. The
REE multitracers were then subjected to γ-ray− 157 −

spectrometry using a Ge detector.
As a preliminary result, about 20 radionuclides of Y, Ce,
Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu were identified in
the short irradiation. Chemical yields of over 80% wereobtained for those nuclides. A separation factor for the Hftarget material was evaluated to be 3×10–3 based on the343-keV γ peak of 175Hf. In the conference, the results on
the long irradiation will be also presented together withthose on the conventional REE multitracer from a 197Au
target.
3B03 Measurement of Pa-231 photofission crosssection by fission track method
NISHIKAWA, M.1, OHTUKI, T.2, HIROSE, K.2, SATO, W.3,
YOKOYAMA, A.3, NAKANISHI, T.3(1Grad. School Nat. Sci. Tech., Kanazawa Univ., 2Lab. Nucl.
Sci., Tohoku Univ., 3Inst. Sci. Eng., Kanazawa Univ.)
Fission track method has been applied to the photofission
reaction of 231Pa. Quartz and muscovite were used to detectfission fragments. Natural uranium (nU) and 232Th wereused as reference nuclides. Each nuclide was sandwiched
between quartz and muscovite to irradiate withbremsstrahlug at Tohoku Univ. After the irradiation,quartz and muscovite detectors were subjected to chemical
etching. As for the etching condition, etching for 15
minutes by using 28% solution of ammonium hydrogen
fluoride proved suitable for quartz, and etching for 40
minutes by using 48% hydrogen fluoride proved suitable
for muscovite. The ʻnumber of fission tracks/number oftarget nuclidesʼ ratios were compared between
simultaneously irradiated 231Pa, nU, and 232Th to evaluate
the photofission cross-section of 231Pa.
3B04 Cross section measurements of neutroninduced reactions for Cu and Nb in the intermediately
energy region (II)OMOTO, T.1, NINOMIYA, K.1, 2, NAKAGAKI, R.1,
TAKAHASHI, N.1, SEKIMOTO, S.3, UTSUNOMIYA, T.3,
YASHIMA, H.3, SHIBATA, S.3, SHIMA, T.4, KINOSHITA,
N.5, MATSUMURA, H.5, HAGIWARA, M.5, IWAMOTO, Y.2,
SATOH, D.2, M. W. CAFFEE6, IMAMURA. M.7,
NISHIIZUMI, K.8, SHINOHARA, A.1(1Grad. School Sci., Osaka Univ., 2JAEA, 3Res. Reactor Inst.,
Kyoto Univ., 4RCNP, Osaka Univ., 5KEK, 6Dep. Phys.,
Purdue Univ., 7National Museum of Japan History, 8Space
Sci. Lab., California Univ.)
Neutron induced nuclear reactions in the intermediateand high energy region (>50 MeV) are important toinvestigate whole energy dependence of hadron induced
nuclear reactions. It is because there are few experimental
studies of neutron induced reactions above 50 MeV. There
are large deviations on the nuclear reactions between
neutron and proton induced reactions in the low energy
region due to the charge difference. In this study,
monoenergetic 282 MeV neutron flux was obtained fromthe two proton irradiations for 7Li target with 300 MeV at
the N0 course in the Research Center for Nuclear Physics,
Osaka University. We performed the monoenergeic
neutron irradiations for cupper and niobium metals.
Production cross sections of the radionuclides were
determined with a gamma-ray counting method by using
high purity germanium detectors. In this presentation, we
discuss the energy dependence of cross sections bycomparing 282 MeV and 368 MeV (our previous work)neutron induced reactions, and examine the nuclear
reaction mechanism through comparison between the

cross sections of neutron and proton induced reactions.
3B05 Measurement of the half-life of Th-229g
KIKUNAGA, H.1, MITSUGASHIRA, T.2, SUZUKI, T.3,
NOMURA, M.3, SHINOHARA, A.1(1Grad. School of Sci., Osaka Univ., 2IMR, Tohoku Univ.,
RLNR, 3Tokyo Inst. Technol.)The half-life of 229gTh has been reevaluated. Uranium
isotopes which were determined the isotopic ratio withTIMS were purified with anion exchange columns toeliminate thorium isotopes. In order to determine theisotopic ratio of 232U to 233U, a part of the uranium isotopes
was subjected to α-spectrometry. The purified uranium
isotopes were left to stand for 3-289 d to allow the growthof thorium isotopes. The thorium isotopes were separated
from the uranium isotopes and subjected to α-spectrometry
to determine the isotopic ratio of 228Th/229Th. From thoseisotopic ratios and the half-life of 228Th (T1/2 = 1.9116±0.0016y), 232U (T1/2 = 68.9±0.4 y), and 233U (T1/2 = 159200±200 y),
we estimate the half-life of 229Th to be 7896±66 y.
3B06 Nuclear deformation effect on the excitation
function of heavy ion fusion reaction on rare earth
targets with the O-16 projectile
Asano, A.1, Kaiya, H.1, Araki, M.1, Nishikawa, M.1, Ooe, K.2,
Kikunaga, H.2, Takahashi, N.2,
Yokoyama, A.3,
(1Grad. School Nat. Sci. Tech., Kanazawa Univ., 2Grad.
School Sci., Osaka Univ., 3Inst. Sci. Eng., Kanazawa Univ.)
We have performed an experiment for the synthesis ofheavy elements with oxygen-16 and Tm-169 to compare
the results with Ba and La targets. The Tm target is more
deformed than the others. The formation cross sections ofevaporation residues through the nuclear fusion process
were measured by using a stack technique and a gas-jet
technique.
The cross sections were derived fromradioactivities of the products. The obtained excitation
functions of the La+O and the Tm+O systems are comparedwith each other to discuss influence of nuclear
deformation.
3B07 Study of sub-barrier fusion hindrance in 19F+ 209Bi reaction
NISHINAKA, I.1, KASAMATSU, Y.2, TANIKAWA, M.3,
GOTO, S.4, ASAI, M.1(1Advanced Sci. Res. Center, JAEA, 2Nishina Center,
RIKEN, 3Fac. Sci. , Univ. Tokyo, 4Fac. Sci. , Niigata Univ.)
The fusion-fission cross sections for 19F + 209Bi at subbarrier energies were determined by a radiochemical
method in order to study sub-barrier fusion hindrance inheavy-mass systems. The irradiations of the 209Bi target
with 83-135 MeV 19F ions were carried out at the JAEA
tandem accelerator. After irradiation, the target, thebacking and the catcher foil in which fission fragments
were collected were dissolved in 6M HCl solution. The
radiochemical separations of molybdenum (VI) fromfission product mixture were carried out by using ionexchange techniques. Precipitation of Mo with α-benzoinoxime was applied to the preparation of samples for γ-ray
spectrometry. Fission cross sections were obtained fromthe cross sections of 99Mo by using the fractional yield of
99
Mo to the total fission yield which was deduced from themass yield curves. The fusion-fission excitation function
for 19F + 209Bi at sub-barrier energies was determined down
to nearly two order magnitude smaller than the datameasured in the energy range of 88-123 MeV by silicon− 158 −

surface barrier detectors. We will discuss the sub-barrier
fusion hindrance in the present reaction, comparing thetheoretical calculations and the systematics.
3B08 Development of a new gas-filled recoil ion
separator GARIS-II
KAJI, D.1, MORIMOTO, K.1, SATO, N.2, YONEDA, A.1,
MORITA, K.1(1Nishina Center for Acc. Based Sci., RIKEN, 2Advanced
Sci. Research Center, JAEA)
We designed a new gas-filled recoil ion separator GARISII. A gas-jet transport system coupled to GARIS-II as apre-separator will be a promising tool for next-generation
superheavy element chemistry, i.e., identifying SHE
nuclides under low background conditions with highefficiency of the gas-jet transport. GARIS-II consists of fivemagnets arranged in a Qv-D-Qh-Qv-D configuration. Thisconfiguration is the first design for the purpose of SHE
study. Ion optical characteristics were analyzed using thecomputer code TRANSPORT. The solid angle is increased
from 12.2 to 20.2 msr, approximately 1.7 times higher than
GARIS. The total path length of the separator is 5.12 m.
GARIS-II will be able to use various filled gas, such as He
and He/H2 mixture. The separator will be able to transport
the recoil ion with magnetic rigidity Bρ=2.44 Tm.
3B09 Production of 261Rf for chemical studies
using the gas-jet transport system coupled to GARISHABA, H.1, OOE, K.2, OZEKI, K.1, KASAMATSU, Y.1, KAJI,
D.1, KUDOU, Y.1, KOMORI, Y.2, SATO, N.3, SHINOHARA,
A.2, MORITA, K.1, MORIMOTO, K.1, YONEDA, A.1(1RIKEN, 2Osaka Univ., 3JAEA)
A gas-jet transport system for superheavy element
chemistry has been coupled to the gas-filled recoil ion
separator GARIS at the RIKEN linear accelerator. In thiswork, we have investigated the performance of the systemusing 261Rf produced in the 248Cm (18O, 5n) 261Rf reaction.
Alpha-particles of 261Rf separated with GARIS and extracted
to a chemistry laboratory were successfully identified witha rotating wheel system for α-spectrometry under
extremely low background conditions. By comparing withthe spectrum measured with a focal plane Si detector in a
separate experiment, the gas-jet transport efficiency of261
Rf was evaluated to be 52±12%. The transport efficiencyof GARIS was 7.8±1.7% for the focal plane of 100-mm
diameter, referring to the cross section of 13 nb measured
at JAEA. The present result demonstrates that the GARIS/
gas-jet system is a promising approach to explore newfrontiers in SHE chemistry: (i) the backgroundradioactivities originating from unwanted reaction products
are strongly suppressed, (ii) the intense primary heavy-ion
beam is absent in the gas-jet chamber, and hence high gasjet transport efficiency is achieved, and (iii) the beam-free
conditions also make it possible to investigate new chemicalsystems that were not accessible before.
3B10 Production of long-lived Fm and Es tracers
using a Cf target and its application to nuclear
spectroscopy
ASAI, M.1, TSUKADA, K.1, KASAMATSU, Y.1, SATO, T.K.1,
TOYOSHIMA, A.1, NAGAME, Y.1(1Adv. Sci. Res. Center, JAEA, 2Nishina Center, RIKEN)
We have successfully obtained a large amount of longlived Fm and Es tracers which can be used in various kindsof heavy-actinide chemistry experiments. Fm and Es
isotopes were produced with a Cf target and a 12C beamfrom the JAEA tandem accelerator. Reaction products
recoiling out of the target were collected with a gas-jet
transport technique. After 3-day irradiation, Fm and Es
isotopes were chemically separated from the collected
products. By measuring α- and γ-energy spectra, weevaluated an amount of each Fm and Es isotope, and otherradioactive impurities. We also performed α-γ coincidence
measurements for 253Fm using the same source.
3B11 Productions and decay properties of a newisotope of 263Hs
KAJI, D.1, MORIMOTO, K.1, SATO, N.2, HABA, H.1,
ICHIKAWA, T.3, IDEGUCHI, E.4, KOURA, H.2, KUDO, Y.1,
OZAWA, A.5, OZEKI, K.1, SUMITA, T.1,6, YAMAGUCHI, T.7
YONEDA, A.1, YOSHIDA, A.1, MORITA, K.1(1Nishina Center for Acc. Based Sci., RIKEN, 2 Advanced
Sci. Research Center, JAEA, 3Yukawa institute fortheoretical physics, Kyoto Univ., 4 Center for Nucl. Study,
Univ. of Tokyo, 5Univ. of Tsukuba, 6Tokyo Univ. of Science,
7
Saitama Univ.)
A new neutron deficient hassium (Z=108) isotope of263
Hs was identified via two different reactions of 206Pb(58Fe, n) and 208Pb (56Fe, n) by using the gas-filled recoil
separator GARIS. During irradiation of 206Pb with the 58Fe
beam and irradiation of 208Pb with the 56Fe beam, 8 decay
chains and 1 decay chain, respectively, were observed.
The properties of decay events obtained by irradiation of58
Fe on 206Pb match well with those by irradiation of 56Fe on
208
Pb. The mean α-decay energies for the 3 groups are
10.82, 10.55, and 10.37 MeV, respectively. The half-life of263
Hs is determined to be 0.60 ms.
3B12 Productions and decay properties of
264, 265
Hs
SATO, N.1, KAJI, D.2, MORIMOTO, K.2, HABA, H.2,
ICHIKAWA, T.3, IDEGUCHI, E.4, KOURA, H.1, KUDOU,
Y.2, OZAWA, A.5, OZEKI, K.2, SUMITA, T.2,5, YAMAGUCHI,
T.6, YONEDA, A.2, YOSHIDA, A.2, MORITA, K.2(1Advanced Science Research Center, Japan Atomic Energy
Agency, 2Nishina Center for Accelerator Based Science,
RIKEN, 3Yukawa Institute for Theoretical Physics, 4Center
for Nuclear Study, Univ. of Tokyo, 5Univ. of Tsukuba,
6
Tokyo Univ. of Science, 7Saitama Univ.)
The deformed proton shell gap at Z = 108 and theneutron shell gaps at N = 152 and 162 have been foundfrom the systematic studies of α-spectrometry of theheaviest nuclei. The doubly deformed magic nucleus 270Hs(Z = 108, N = 162) and its neighbor nuclei had been studied
in detail. However, the properties of neutron-deficient Hs
nuclei are not well known.
In this work, the production and decay properties of
264,265
Hs produced in the 208Pb (58Fe, xn) [x = 1,2] and 207Pb(58Fe, n) reactions were investigated. The experiment was
performed at the RILAC facility in RIKEN. The evaporation
residues (ERs) were separated from the primary beamwith the gas-filled recoil ion separator, GARIS. In the focal
plane of GARIS the products were implanted into a positionsensitive Si detector for measuring the arrival of ERs andsubsequent α-decays or spontaneous fission from ERs.
We have measured production cross-sections of 264,265Hs
in the 58Fe + 208Pb reaction at several bombarding energies.
For the 208Pb (58Fe, n) 265Hs reaction, the cross-section
maximum of (51+46-29) pb was obtained at the bombarding
energy of 220.5 MeV at the middle of the target. For eveneven nucleus 264Hs, we have also observed accurate decay
data with good statistics.

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3B13 Production and Decay Properties of 266Bh
and its daughter nuclei
MORIMOTO, K.1, MORITA, K.1, KAJI, D.1, HABA, H.1,
OZEKI, K.1, KUDOU, Y.1, SATO, N.1,2, SUMITA, T.1,3,
YONEDA, A.1, ICHIKAWA, T.1,4, FUJIMORI, Y.5, GOTO,
S.6, IDEGUCHI, E.7, KASAMATSU, Y.1, KATORI, K.1,
KOMORI, Y.8, KOURA, H.2, KUDO, H.6, OOE, K.8, OZAWA,
A.9, TOKANAI, F.5, TSUKADA, K.2, YAMAGUCHI, T.10,
YOSHIDA, A.1(1Nishina Center for Accelerator Based Science, RIKEN,
2
Japan Atomic Energy Agency, 3Tokyo University of
Science, 4Yukawa Institute for Theoretical Physics,
5
Yamagata Univ., 6Niigata Univ., 7Center for Nuclear Study,
Univ. of Tokyo, 8Department of Chemistry, Osaka
University, 9Univ. of Tsukuba, 10Saitama Univ.)
A nuclide, 266Bh, is the great-grand-daughter of 278113
that is produced in the 209Bi + 70Zn reaction. The
identification was based on a genetic link to the known
daughter nucleus 262Db by alpha-decays. The identificationof the heaviest nuclides is very difficult because of theirextremely small production cross sections. Only fiveatoms have been assigned to 266Bh by direct production.
The main purpose of this work is to provide further
confirmation of the production and identification of theisotope 278113.
We have observed 32 correlations in total. 14 correlation
events were clearly assigned to the decay chain of 266Bh,
and 10 correlations events were tentatively assigned to the
decay chain of 266Bh. And the rest correlations wereassigned to decay chain of 267Bh or not assigned.
As a present result, a state in 266Bh, which decays by analpha emission with the energies ranging from 9.05 to 9.23
MeV, feeds a state in 262Db, which decays by alpha emission
and by SF with a previously known half-life. The result
provided a further confirmation of the production andidentification of the isotope of the 113th element, 278113,
studied by a research group at RIKEN.

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