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and ThO
Tabata, Chihiro; Shirasaki, Kenji*; Sakai, Hironori; Sunaga, Ayaki*; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*
CrystEngComm (Internet), 24(19), p.3637 - 3648, 2022/05
Times Cited Count：2 Percentile：48.22(Chemistry, Multidisciplinary)
)O ( = Th, Np) prepared by supercritical hydrothermal synthesisShirasaki, Kenji*; Tabata, Chihiro*; Sunaga, Ayaki*; Sakai, Hironori; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*
Journal of Nuclear Materials, 563, p.153608_1 - 153608_11, 2022/05
Times Cited Count：2 Percentile：50.96(Materials Science, Multidisciplinary)We focused on the direct synthesis of (U, )O solid solution (=Th, Np) by extending our recent progress in hydrothermal synthesis with additives. The homogeneity of the (U, )O ( = Th, Np) systems prepared by supercritical hydrothermal reactions was investigated through crystallographic analysis based on Vegard's law, and the 
Na nuclear magnetic resonance (NMR) measurement of (U, Np, Na)O solid solutions. Our experimental and analytical results revealed that (i) an optimal additive is ammonium carbonate and starting uranium valence is IV in the case of (U, Th)O, and (ii) an optimal additive is ethanol and starting uranium valence is VI in the case of (U, Np)O, for producing the homogeneous solid solutions by hydrothermal synthesis.
; Stoichiometry, crystal shape and size, and homogeneity observed using Na-NMR spectroscopy of (U, Na)OTabata, Chihiro*; Shirasaki, Kenji*; Sunaga, Ayaki*; Sakai, Hironori; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*
CrystEngComm (Internet), 23(48), p.8660 - 8672, 2021/12
Times Cited Count：5 Percentile：63.38(Chemistry, Multidisciplinary)The hydrothermal synthesis of pure uranium dioxide under supercritical water (SCW) conditions was investigated. The nonstoichiometry, crystallite size and morphology of the UO particles were investigated. The SCW hydrothermal synthesis may be a promising method for producing homogeneous UO and its solid solutions with well-defined nonstoichiometries (
), shapes, and sizes.
Yamaguchi, Mitsutaka; Nagao, Yuto; Kawachi, Naoki; Sato, Takahiro; Fujimaki, Shu; Kamiya, Tomihiro; Torikai, Kota*; Shimada, Hirofumi*; Sugai, Hiroyuki*; Sakai, Makoto*; et al.
International Journal of PIXE, 26(1&2), p.61 - 72, 2016/00
no abstracts in English
Sakai, Ryutaro; Munakata, Masahiro; Kimura, Hideo; Ooka, Masao*; Seguchi, Mariko*
JAEA-Research 2011-029, 24 Pages, 2011/11
JAEA-Research-2011-029.pdf:3.67MB
In the safety assessment for a geological disposal of radioactive waste, it is important to establish validation methods for regional groundwater flow system to estimate radionuclide migration to human environment through groundwater flow. It is necessary to validate the groundwater flow property and flow boundary, as multi-groundwater systems including the different groundwater origins are possible to exist at deep underground. This results show that mixing analysis based on hydrochemical data and spatial plotting with hydrochemical data and thermal data are applicable to validate groundwater flow pattern and groundwater flow boundary in case of Horonobe area. It also demonstrates that mixing analysis based on hydrochemical data and spatial plotting with hydrological and hydrochemical data are applicable to validate the groundwater flow property and groundwater flow boundary in case of Nagaoka area.
Sakai, Ryutaro; Munakata, Masahiro; Seguchi, Mariko*; Ooka, Masao*; Ichikawa, Yasuo*; Nakamura, Masaru*; Ishibashi, Junichiro*
no journal, ,
In the safety assessment for a geological disposal of radioactive waste, it is important to establish validation methods for deep groundwater flow system to estimate radionuclide migration to human environment through groundwater flow. This study discussed the method which estimates groundwater mixing condition and groundwater flow process using principal component analysis to groundwater chemistry and isotopic compositions in case of Horonobe area. The results demonstrated that there are three component of deep groundwater which has long residence time and surface water derived from meteoric water in this area.
Yamaguchi, Mitsutaka; Sakai, Makoto*; Nagao, Yuto; Kawachi, Naoki; Fujimaki, Shu; Arakawa, Kazuo*; Kamiya, Tomihiro; Odaka, Hirokazu*; Kokubun, Motohide*; Takeda, Shinichiro*; et al.
no journal, ,
no abstracts in English
ray in a body on reconstructed images of Si/CdTe semiconductor Compton camera for medical imagingSakai, Makoto*; Kikuchi, Kimiko*; Torikai, Kota*; Arakawa, Kazuo*; Yamaguchi, Mitsutaka; Nagao, Yuto; Kawachi, Naoki; Fujimaki, Shu; Kamiya, Tomihiro; Odaka, Hirokazu*; et al.
no journal, ,
no abstracts in English
rays by body tissue on the image of semiconductor Compton camera for nuclear medical useSakai, Makoto*; Kikuchi, Kimiko*; Torikai, Kota*; Arakawa, Kazuo*; Yamaguchi, Mitsutaka; Nagao, Yuto; Kawachi, Naoki; Fujimaki, Shu; Kamiya, Tomihiro; Odaka, Hirokazu*; et al.
no journal, ,
no abstracts in English
Sugai, Hiroyuki*; Yamaguchi, Mitsutaka; Nagao, Yuto; Hirano, Yoshiyuki*; Sakai, Makoto*
no journal, ,
no abstracts in English
Yamaguchi, Mitsutaka; Nagao, Yuto; Kawachi, Naoki; Fujimaki, Shu; Kamiya, Tomihiro; Torikai, Kota*; Shimada, Hirofumi*; Sugai, Hiroyuki*; Sakai, Makoto*; Arakawa, Kazuo*; et al.
no journal, ,
no abstracts in English
Yamaguchi, Mitsutaka; Nagao, Yuto; Sugai, Hiroyuki*; Sakai, Makoto*; Kawachi, Naoki; Sato, Takahiro; Kamiya, Tomihiro; Fujimaki, Shu; Arakawa, Kazuo*; Narumi, Kazumasa
no journal, ,
no abstracts in English
