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Yoshimura, Kazuya
KEK Proceedings 2018-7, p.36 - 40, 2018/11
no abstracts in English
Otosaka, Shigeyoshi; Amano, Hikaru; Ito, Toshimichi; Kawamura, Hideyuki; Kobayashi, Takuya; Suzuki, Takashi; Togawa, Orihiko; Chaykovskaya, E. L.*; Lishavskaya, T. S.*; Novichkov, V. P.*; et al.
Journal of Environmental Radioactivity, 91(3), p.128 - 145, 2006/00
Times Cited Count:20 Percentile:42.02(Environmental Sciences)Distributions of radionuclides (Sr, Cs and Pu) in seabed sediment in the Japan Sea were observed during 1998-2002. Observed inventories of anthropogenic radionuclides in sediment ranged 0.1-86 Bq m for Sr, 23-379 Bq m for Cs and 0.1-86 Bq m for Pu. In the deep part ( 2 km depth) of the western Japan Basin, Pu/Cs inventory ratios were larger than those in the central Yamato Basin although inventories of radionuclides were not different between basins. The higher Pu/Cs ratios in the western Japan Basin were derived by the production of Pu-enriched particle in the surface layer and effective sinking of particulate materials in this region. In the marginal Yamato Basin and the Ulleung Basin, both inventories and Pu/Cs ratios in sediment were larger than those in the central Yamato Basin. In the eastern/southern Japan Sea, it was suggested that the supply of particulate radionuclides by the TWC enhanced accumulation of radionuclides in this region.
Otosaka, Shigeyoshi; Ito, Toshimichi; Kawamura, Hideyuki; Kobayashi, Takuya; Suzuki, Takashi; Togawa, Orihiko
Dai-45-Kai Kankyo Hoshano Chosa Kenkyu Seika Rombun Shorokushu (Heisei-14-Nendo), p.77 - 78, 2003/12
no abstracts in English
Otosaka, Shigeyoshi; Aramaki, Takafumi*; Suzuki, Takashi; Kobayashi, Takuya; Ito, Toshimichi; Togawa, Orihiko; Chaykovskaya, E. L.*; Dunaev, A. L.*; Karasev, E. V.*; Novichkov, V. P.*; et al.
Proceedings of International Symposium on Radioecology and Environmental Dosimetry, p.390 - 395, 2003/10
Seabed sediments were collected at 22 stations in the Japan Sea, and anthropogenic radionuclides were measured in order to understand distributions and accumulation processes of these materials. Averaged concentrations of Cs in sediment in the Japan Basin and the Yamato Basin were 1.0 Bq/kg and 1.0 Bq/kg, respectively. Although there was no significant difference in mean Cs concentration between the Japan Basin and the Yamato Basin, distributions of radionuclides in these 2 basins showed different features. In the Japan Basin, the spatial variation of concentration of radionuclides was smaller than that at the Yamato Basin. At most stations in the Yamato Basin, significant concentrations of radionuclides were not detected, but remarkable large activities were observed at several stations in the Yamato Basin. For all radionuclides, the highest concentration was observed in the southeastern margin of the Yamato Basin. These results would suggest that there were different accumulation processes of radionuclides between the Japan Basin and the Yamato Basin.
Takahashi, Tomoyuki*; Homma, Toshimitsu
Hoken Butsuri, 36(2), p.111 - 121, 2001/06
no abstracts in English
Yamaguchi, Isoo; ; Morita, Yasuji; ; Shirahashi, Koichi; ; ; ; ; ; et al.
JAERI-Tech 94-030, 53 Pages, 1994/11
no abstracts in English
Amano, Hikaru; Matsunaga, Takeshi; Ueno, Takashi; Yanase, Nobuyuki; Kobayashi, Yoshii
3rd Int. Symp. on Advanced Nuclear Energy Research; Global Environment and Nuclear Energy, 4 Pages, 1991/00
no abstracts in English
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JAERI-M 85-066, 22 Pages, 1985/06
no abstracts in English
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JAERI-M 84-140, 12 Pages, 1984/08
no abstracts in English
Radiation Physics and Chemistry, 18(1-2), p.281 - 291, 1981/00
no abstracts in English
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Genshiryoku Kogyo, 25(6), p.79 - 111, 1979/00
no abstracts in English
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Radioisotopes, 15(3), p.103 - 108, 1966/00
no abstracts in English
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Radioisotopes, 15(3), p.103 - 108, 1966/00
no abstracts in English
Yoshimura, Kazuya; Saito, Kimiaki; Fujiwara, Kenso
no journal, ,
no abstracts in English
Yoshimura, Kazuya; Saito, Kimiaki; Fujiwara, Kenso; Nakama, Shigeo; Mikami, Satoshi
no journal, ,
no abstracts in English