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Ban, Yasutoshi; Hakamatsuka, Yasuyuki; Tsutsui, Nao; Urabe, Shunichi; Hagiya, Hiromichi; Matsumura, Tatsuro
Radiochimica Acta, 102(9), p.775 - 780, 2014/09
Times Cited Count:5 Percentile:36.96(Chemistry, Inorganic & Nuclear)Optical absorption spectra of Np in 3 mol/dm nitric acid at elevated temperatures were measured using an optical glass cell with a water jacket having a light path of 1 cm, and molar extinction coefficients of Np(VI), , were obtained at various temperature. The values of was found to decrease with increasing the temperature, and could be described by the equation = -0.14+85.5, where is the temperature. Oxidation of Np(V) to Np(VI) in 3 mol/dm nitric acid at elevated temperatures was observed using the optical glass cell. Oxidation of Np(V) proceeded as pseudo-first order with respect to Np(V) concentration. The rate equation in the temperature range of 336-362 K was obtained as follows: -d[Np(V)]/dt = 2.210 exp[-6510/()][Np(V)], where and [Np(V)] indicate the gas constant and Np(V) concentration at time , respectively.
Hayashi, Hirokazu; Hagiya, Hiromichi; Kim, S.-Y.*; Morita, Yasuji; Akabori, Mitsuo; Minato, Kazuo
Journal of Radioanalytical and Nuclear Chemistry, 296(3), p.1275 - 1286, 2013/06
Times Cited Count:4 Percentile:32.48(Chemistry, Analytical)Cm was separated and recovered as an oxalate from Cm-Pu mixed oxide which had been Cm oxide sample prepared 40 years ago. Plutonium ions were removed from the solution prepared by dissolution of Cm-Pu mixed oxide in nitric acid, by using an anion exchange resin column. Curium oxalate, a precursor compound of curium oxide, was prepared from the purified curium solution and supplied for the syntheses and measurements of the thermochemical properties of curium compounds.
Ban, Yasutoshi; Hagiya, Hiromichi; Sato, Makoto; Asakura, Toshihide; Morita, Yasuji
Proceedings of 3rd International ATALANTE Conference (ATALANTE 2008) (CD-ROM), 4 Pages, 2008/05
Since N,N-dialkylamide (monoamide) compounds extract tetravalent and hexavalent actinides, they have been proposed as alternative extractants to TBP. In the present work, numerical calculations for estimating separation performance of N,N-di(2-ethyl)hexyl-butanamide (D2EHBA) for U(VI) and Pu(IV) were carried out. A flow sheet was obtained which separate more than 99.9% of Pu(IV) from U(VI) by adjusting nitric acid concentration. Extraction properties of D2EHBA for macro concentrations of U (0.63-1.22 mol/dm(M)) and Pu (6.3 mM) were studied in a batch manner. D2EHBA diluted to 1.5 M by n-dodecane extracted up to 0.8 M of U(VI) without forming precipitation and third phase. Distribution ratios of Pu(IV) were relatively high compared with the ones obtained at tracer concentrations of Pu(IV).
Mineo, Hideaki; Goto, Minoru; Iizuka, Masaru*; Fujisaki, Susumu; Hagiya, Hiromichi*; Uchiyama, Gunzo
Separation Science and Technology, 38(9), p.1981 - 2001, 2003/05
Times Cited Count:22 Percentile:63.74(Chemistry, Multidisciplinary)no abstracts in English
Mineo, Hideaki; Kihara, Takehiro; *; Kimura, Shigeru; *; ; Uchiyama, Gunzo; Hotoku, Shinobu; Watanabe, Makio; ; et al.
JAERI-Conf 99-004, p.498 - 507, 1999/03
no abstracts in English
Mineo, Hideaki; Kihara, Takehiro; *; ; *; Kimura, Shigeru; Uchiyama, Gunzo; Hotoku, Shinobu; ; ; et al.
Proceedings of International Waste Management Symposium '99 (Waste Manegement '99) (CD-ROM), 6 Pages, 1999/03
no abstracts in English
Bamba, Tsunetaka; *; Tamura, Yukito; *; Yonezawa, Chushiro; Carter, P.*
Analytical Sciences, 14, p.389 - 394, 1998/04
Times Cited Count:11 Percentile:38.79(Chemistry, Analytical)no abstracts in English
Kihara, Takehiro; *; ; *; *; Fujine, Sachio
JAERI-Research 96-070, 23 Pages, 1997/01
no abstracts in English
Bamba, Tsunetaka; *; Tamura, Yukito; Yonezawa, Chushiro
Bunseki Kagaku, 42, p.317 - 323, 1993/00
no abstracts in English
Hayashi, Hirokazu; Hagiya, Hiromichi; Morita, Yasuji; Akabori, Mitsuo; Minato, Kazuo
no journal, ,
no abstracts in English
Matsumura, Tatsuro; Tsubata, Yasuhiro; Urabe, Shunichi; Ichimura, Seiji; Hagiya, Hiromichi; Tsujimoto, Kazufumi
no journal, ,
no abstracts in English
Matsumura, Tatsuro; Tsubata, Yasuhiro; Urabe, Shunichi; Shibata, Mitsunobu; Ichimura, Seiji; Hagiya, Hiromichi*; Tsujimoto, Kazufumi
no journal, ,
no abstracts in English