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Yamaguchi, Akiko*; Honda, Tasuku*; Tanaka, Masato*; Tanaka, Kazuya; Takahashi, Yoshio*
Geochemical Journal, 52(5), p.415 - 425, 2018/00
Times Cited Count：18 Percentile：66.84(Geochemistry & Geophysics)Ion-adsorption type REE deposits in weathered granite are main sources of REE essential for high-technology industries. However, these type deposits have not been searched in Japan. In this study, Bulk REE abundances (= REE
), ion-exchangeable REE (= REE
) by ammonium chloride solution, and percentage of REE relative to REE (= REE
) in fresh and weathered granite samples in Southwest Japan (i.e., Hiroshima and Shimane Prefectures) were determined. The REE and REE were comparable to those of ion-adsorption type REE deposits in China. Extended X-ray adsorption fine structure (EXAFS) spectra of REE in original samples and samples after the extraction of ion-exchangeable REE showed that (i) REE in samples with high REE mainly forms outer-sphere complexes and (ii) the remaining REE in the rocks after the extraction forms inter-sphere complexes.
Sasao, Eiji
ESI-News, 32(4), p.155 - 162, 2014/08
This report compiled the information on distribution and mode of occurrence of uranium deposit was compiled from the published data. Distribution of uranium deposit suggests that geological environments suitable for geological isolation are widely distributed in the Japanese Islands, despite their location in a geologically active area. The mode of occurrence of the uranium deposits indicates that formation of uranium-bearing mineral as well as sorption is expected in both sedimentary and crystalline rocks. The functioning of the natural barrier would be expected in various geological environments in the Japanese Islands, because mineralization and sorption are regarded as a barrier function to retard the migration of radionuclides in HLW, and because of the uranium deposits in the various rock types.
Narumi, Issei
Science & Technology Journal, 12(5), p.50 - 51, 2003/05
no abstracts in English
; ; Yabuuchi, Satoshi
JNC TY7400 2000-001, 72 Pages, 2000/03
JNC-TY7400-2000-001.pdf:4.01MB
None
Isobe, Hiroshi
Genshiryoku Bakkuendo Kenkyu, 5(1), p.67 - 72, 1998/08
no abstracts in English
Environment & Innovation in Mining and Mineral Technology, 1, p.181 - 191, 1998/00
no abstracts in English
Yanase, Nobuyuki; Sato, Tsutomu; ; Sekine, Keiichi
Radiochimica Acta, 82, p.319 - 325, 1998/00
no abstracts in English
Sato, Tsutomu; Yanase, Nobuyuki; I.S.Williams*; W.Compston*; M.Zaw*; T.E.Payne*; P.L.Airey*
Radiochimica Acta, 82, p.335 - 340, 1998/00
no abstracts in English
Iida, Yoshimasa
Donen Giho, (104), p.135 - 140, 1997/12
Uranium ore in the Athabasca region, Canada, is highly variable in density. This is due to large variations in the grade of high-density uranium and associated metalliferous minerals, and also to changes in porosity. As it is not practical to take accurate measurements of dry bulk density values of a large number of samples. As a result of investigation on actual ore samples, it has been found practical to estimate the dry bulk density of ore from measured wet bulk density and grain density calculated from chemical data.
Kobayashi, Takao
PNC TN1510 97-001, 56 Pages, 1997/05
no abstracts in English
Sato, Tsutomu; Murakami, Takashi*; Yanase, Nobuyuki; Isobe, Hiroshi; T.E.Payne*; P.L.Airey*
Environmental Science & Technology, 31(10), p.2854 - 2858, 1997/00
Times Cited Count：81 Percentile：88.44(Engineering, Environmental)no abstracts in English
Yoshioka, Naoya*; Tsuchihara, H.*; Horita, M.*; Kinoshita, Naoto*
PNC TJ1449 96-007, 349 Pages, 1996/03
None
Yanase, Nobuyuki; Sato, Tsutomu; Isobe, Hiroshi; Sekine, Keiichi
Hoshasei Haikibutsu Kenkyu, 2(1-2), p.121 - 135, 1996/02
no abstracts in English
