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1 surface studied by reflection high-energy positron diffractionFukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 145, 2009/12
no abstracts in English
Sato, Tatsuhiko; Satoh, Daiki; Endo, Akira; Shigyo, Nobuhiro*
no journal, ,
We examined the capability of DARWIN-P for measuring dose rates in high-intensity radiation fields, using the quasi-monoenergetic neutron field at the LC0 beam course of the TIARA cyclotron.
Saiki, Seiichi; Nagasawa, Naotsugu; Hiroki, Akihiro; Morishita, Norio; Tamada, Masao; Kudo, Hisaaki*; Katsumura, Yosuke*
no journal, ,
no abstracts in English
Yamaguchi, Makoto; Taguchi, Mitsumasa
no journal, ,
Aqueous solutions of hydrogen peroxide were irradiated with helium ion beam to assess the effect of dissolved hydrogen which is presumed to be high concentration after anaerobic corrosion of metal canisters in deep geological repository of high level radioactive waste. While hydrogen peroxide concentration increased linearly with accumulated dose in argon-saturated solutions, it decreased in hydrogen-saturated solutions. Observed trends were successfully reproduced by homogeneous reaction model calculation.
-HO mixtureTanaka, Nobuyuki; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Onuki, Kaoru
no journal, ,
For the improvement of the efficiency of thermochemical water-splitting IS process, it is necessary to pre-concentrate the HIx solution to over-azeotropic concentration. The development of the radiation grafted polymer electrolyte membrane was pushed forward and the result for fuel cells was gained. As the result of the application to HI concentration, when compared to Nafion the tested membranes exhibited lower electric cell resistance, and thereby decreasing up to 40% at 100
C of the overall energy required in the concentration operation.
Sr solvent impregnated resin against 
irradiationHoshi, Harutaka; Kikuchi, Takahiro; Morita, Yasuji; Kimura, Takaumi
no journal, ,
Novel solvent impregnated resins (SIR), which have significant selectivity for Cs or Sr, were examined their stability against irradiation. SIR was soaked in nitric acid solution and was irradiated by 
Co source. After the irradiation, resin was filtrated and air-dried. The capacity of Cs or Sr was examined by batch method. The capacity reduced with nitric acid concentration, however, it was mainly caused by elution of impregnated extractant into aqueous phase. Thus, these resins indicated rather stability against irradiation. Selectivity was also examined through a column packed with irradiated resin. Cs or Sr was effectively separated from other typical fission products by using simulated high level liquid waste.
Hakoda, Teruyuki; Shimada, Akihiko; Matsumoto, Kanae*; Hirota, Koichi
no journal, ,
no abstracts in English
Nogami, Masanobu*; Sugiyama, Yuichi*; Kawasaki, Takeshi*; Harada, Masayuki*; Ikeda, Yasuhisa*; Kikuchi, Toshiaki*; Kawata, Yoshihisa; Morita, Yasuji
no journal, ,
In the novel reprocessing system under development for spent FBR fuels based on the precipitation method, U and Pu of very low concentrations remain in the supernatant after almost all U and Pu in the dissolvent solution are separated by precipitation. The remaining U and Pu are supposed to be removed by an adsorption method using polyvinylpolypyrrolidone (PVPP) which is insoluble in water. In this study, stability of PVPP in HNO
solutions under -ray irradiation was investigated. As the result, remarkable decreases in the capacity were not found in all samples. Or rather, the capacity was found to be increased for the sample irradiated in 6M HNO for 0.90 MGy. These facts revealed that PVPP maintains the adsorptivity to U(VI) under various concentrations of HNO for 10 days of operation under -ray irradiation.
Shikaze, Yoshiaki; Tanimura, Yoshihiko; Saegusa, Jun; Uchita, Yoshiaki; Tsutsumi, Masahiro; Yoshizawa, Michio; Harano, Hideki*; Matsumoto, Tetsuro*; Kaneko, Hirohisa
no journal, ,
no abstracts in English
Yokota, Wataru; Sato, Takahiro; Okumura, Susumu; Kashiwagi, Hirotsugu; Miyawaki, Nobumasa; Kurashima, Satoshi; Yoshida, Kenichi; Kamiya, Tomihiro
no journal, ,
no abstracts in English
Fujimaki, Shu; Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Ito, Sayuri; Yamazaki, Haruaki; Ishioka, Noriko
no journal, ,
Nutritional functions of the higher plants are the basis of food production and techniques to control these functions are the key of agriculture. Our group has been studying on these functions along with development of a positron-emitting imaging system (PETIS). Recently, we have developed quantitative analysis methods of PETIS data and started to apply them to evaluate practical cultivation techniques in collaborations with institutes for agriculture. In this presentation, some representative researches and our future aspect will be shown.
Kumagai, Yuta; Nagaishi, Ryuji; Yamada, Reiji
no journal, ,
Reactions of OH radical in kinetic scheme of radiation-induced reduction of dichromate ion in the presence of silica gel were studied using 
-butanol as a scavenger of OH radical in order to understand addition effects of silica gel. On the condition that OH radical is scavenged by -butanol, change in the reduction yield was not observed by the addition of silica gel. This result shows that increase in the reduction yield in the presence of silica gel is due to suppression of oxidation by OH radical and that change in the radiolytic yield of water is minor effect up to 10wt.% addition of silica gel.
radiation durability of TRPEN adsorbent with porous silica supportKoma, Yoshikazu; Watanabe, So; Matsumura, Kazumi; Sano, Yuichi
no journal, ,
The extraction chromatography technology has been developed for recovery of Am and Cm from a high level liquid waste of fast reactor fuel reprocessing. The adsorbent that retains TRPEN (tetrakis(alkylpyridylmethyl)ethylenediamine) extractant on the porous silica support coated with styrene-divinyl benzene polymer was investigated on its durability to radiation. Dependency of adsorption capacity on dose was different from those of other extractants.
Ishii, Satomi; Suzui, Nobuo; Ito, Sayuri; Ishioka, Noriko; Kawachi, Naoki; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu
no journal, ,
no abstracts in English
Kikuchi, Kaori*; Kawachi, Naoki; Ishii, Satomi; Suzui, Nobuo; Ishioka, Noriko; Ito, Sayuri; Honda, Ichiro*; Fujimaki, Shu
no journal, ,
no abstracts in English
CO and positron emission tomographyKawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Ito, Sayuri; Ishioka, Noriko; Fujimaki, Shu; Kikuchi, Kaori*; Watabe, Hiroshi*
no journal, ,
no abstracts in English
Cu for clinical applicationsWatanabe, Shigeki; Watanabe, Satoshi; Liang, J. X.; Hanaoka, Hirofumi*; Iida, Yasuhiko*; Endo, Keigo*; Ishioka, Noriko
no journal, ,
no abstracts in English
Suzui, Nobuo; Ito, Sayuri; Kawachi, Naoki; Ishioka, Noriko; Fujimaki, Shu; Nakamura, Shinichi*
no journal, ,
no abstracts in English
L. cv Choukoukoku, Cd hyper-accumulating rice cultivarNakamura, Shinichi*; Kudo, Junichi*; Rai, Hiroki*; Hattori, Hiroyuki*; Chino, Mitsuo*; Suzui, Nobuo; Ito, Sayuri; Kawachi, Naoki; Ishioka, Noriko; Fujimaki, Shu; et al.
no journal, ,
no abstracts in English
Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
The helium bubble formed in silicon was observed by the positron annihilation method by the high-dose helium ion implantation. Helium ions were implanted to the silicon (irradiation dose: 210
/cm
at room temperature) with the energy of 50-200 keV. The peak intensities of annihilation rays (S parameter) and its annealing behaviors were measured. At as-implanted state, S parameter increased because of the implantation defects. After 300 C annealing, S parameter decreased. From the first principle calculation, positron trapping at the defect cluster of approximately 1 nm filled up with 36 helium atoms is suggested. This means that positrons are trapped to the irradiation defects filled up with the helium atoms. Positron annihilation method can detect the generation and disappearance process of the helium bubble by the ion implantation.
