Anthropogenic radionuclides in sediment in the Japan Sea; Distribution and transport processes of particulate radionuclides

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

https://doi.org/10.1016/j.jenvrad.2006.09.001

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.

Anthropogenic radionuclides in sediment in the Japan Sea

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.

Development of partitioning method; Partitioning test facility constructed in NUCEF

Yamaguchi, Isoo; *; Morita, Yasuji; ; Shirahashi, Koichi; ; ; *; ; *; et al.

JAERI-Tech 94-030, 53 Pages, 1994/11

JAERI-Tech-94-030.pdf:4.61MB

no abstracts in English

Results of Research Development in the Partitioning Technology for Highly Radioactive Liquid Waste and the Future Plan

;

JAERI-M 85-066, 22 Pages, 1985/06

JAERI-M-85-066.pdf:0.69MB

no abstracts in English

Gamma irradiation facilities

Radiation Physics and Chemistry, 18(1-2), p.281 - 291, 1981/00

no abstracts in English

Loss of Cesium-137 and Potassium by Dry Ashing and Hydrochloric Acid Treatment of Total Diet Samples

; ;

Radioisotopes, 15(3), p.103 - 108, 1966/00

https://doi.org/10.3769/radioisotopes.15.3_103

no abstracts in English

Study on distribution and migration of radioactive substances around the Fukushima Daiichi Nuclear Power Plant, 7; Distributions of dose rate and caesium-137 deposition in urbanized area

Yoshimura, Kazuya; Saito, Kimiaki; Fujiwara, Kenso; Nakama, Shigeo; Mikami, Satoshi

no journal, , 

no abstracts in English