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Kaneko, Masashi; Watanabe, Masayuki
Journal of Radioanalytical and Nuclear Chemistry, 316(3), p.1129 - 1137, 2018/06
Times Cited Count：17 Percentile：86.32(Chemistry, Analytical)We applied density functional theory calculations to Am(III) and Eu(III) complexes with chalcogen-donor ligands of the formula N(EPMe
)
(E = O, S, Se, Te). We calculated the equilibrium structures and relative stabilities of the complexes in the complexation reaction. The results indicated that the tendency of the relative stability is O 
S 
Se Te, which is consistent with the trend of soft acid classification. Molecular orbital overlap population analysis suggested that this tendency can be correlated with the bonding type in the covalent interaction between the f-orbitals of the metal atom and the chalcogen-donor atoms.
Watanabe, So; Sano, Yuichi; Kofuji, Hirohide; Takeuchi, Masayuki; Shibata, Atsuhiro; Nomura, Kazunori
Journal of Radioanalytical and Nuclear Chemistry, 316(3), p.1113 - 1117, 2018/06
Times Cited Count：9 Percentile：67.01(Chemistry, Analytical)Shimada, Kozue; Iwasaki, Maho; Kurosawa, Katsuaki; Hamada, Yosei; Yonekawa, Minoru; Sato, Soichi; Kaji, Naoya; Koyama, Tomozo; Nakayama, Shinichi
no journal, ,
Nagaoka, Mika; Fujita, Hiroki; Aida, Taku*; Smith, R.*
no journal, ,
Radioactivity concentration in environmental sample such as leaf, seaweed has been measured through chemical separation with organic matter decomposition and extraction of target element. However, the usual chemical treatment could affect worker's health, chemical hood and surrounding environment by usage of chemical regent. On the other hand, supercritical water reaction could decompose organic matter without health and environmental hazard caused by the regent. Therefore, we have tried to apply the supercritical water reaction to radioactivity analysis of environmental samples. In this research, organic matter content and strontium concentration in environmental sample were compared with between before and after the reaction. The organic matters were highly decomposed with the water reaction at higher temperature and for longer reaction time. However the strontium was not extracted into solution after the reaction.
Nagame, Yuichiro; Sato, Tetsuya; Asai, Masato; Kaneya, Yusuke*; Makii, Hiroyuki; Mitsukai, Akina; Osa, Akihiko; Sch
del, M.*; Toyoshima, Atsushi; Tsukada, Kazuaki; et al.
no journal, ,
Miyamoto, Yutaka; Yasuda, Kenichiro; Magara, Masaaki
no journal, ,
Actinides including Am, Th, U, and Pu were sequentially separated from the lanthanides and other elements with a small anion-exchange column. Americium was completely separated from lanthanides by using the mixture of only simple acids including acetic acid, hydrochloric acid, and nitric acid without any special chelate reagents.
Tomitsuka, Tomohiro; Kaneya, Yusuke*; Sato, Tetsuya; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina; Osa, Akihiko; Nishio, Katsuhisa; Nagame, Yuichiro; et al.
no journal, ,
In order to investigate the adsorption behavior of Lawrencium (Lr, Z = 103) on a Tantalum (Ta) surface, we measured ionization efficiencies of Lr under several temperature conditions of the surface ionization. We observed ionization efficiencies of Lr which were lower than those calculated by the Saha-Langmuir equation in lower temperature region. Based on a temperature dependence of the obtained ionization efficiencies, we discuss the adsorption behavior of Lr on the Ta surface.
Miyamoto, Yutaka; Esaka, Fumitaka; Suzuki, Daisuke; Yasuda, Kenichiro; Magara, Masaaki
no journal, ,
We have been analyzing ultra-trace amounts of nuclear materials (uranium and plutonium) in the safeguards environmental samples to meet the analytical requests from the IAEA, and the analytical techniques for ultra-trace amounts of nuclear materials (uranium and plutonium) in the environmental samples have been developed in the clean-room facility, CLEAR, in order to contribute to the strengthened safeguards system and improve the analytical ability for the safeguards environmental samples. Our developed techniques to measure the precise amounts and isotopic ratios of femto-grams to nano-grams of nuclear materials are introduced, and the role of CLEAR in the IAEA network for the analysis of safeguards environmental samples is mentioned.
Chiera, N. M.
no journal, ,
Okubo, Ayako; Shinohara, Nobuo; Umino, Yuji; Hara, Mikiya
no journal, ,
Kimura, Yoshiki; Shinohara, Nobuo; Matsumoto, Tetsuya*
no journal, ,
