Temporal and spatial variations of 137Cs in the waters off a nuclear fuel reprocessing facility in Rokkasho,Aomori, Japan |
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| Authors: | Takahiro Nakanishi Tatsuo Aono Masatoshi Yamada Masashi Kusakabe |
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| Affiliation: | (1) Nakaminato Laboratory for Marine Radioecology, National Institute of Radiological Sciences, Isozaki-cho 3609, Hitachinaka Ibaraki, 311-1202, Japan;(2) Present address: Research Group for Environmental Science, Japan Atomic Energy Agency, Shirakata-Shirane 2-4, Tokai-mura, Naka-gun Ibaraki, 319-1195, Japan;(3) Present address: Fundamental Technology Center, National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba 263-8555, Japan |
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| Abstract: | ![]()
Five survey cruises were carried out from 2004 to 2007 to determine 137Cs concentrations in the water columns off Rokkasho Village, Aomori Prefecture, Japan, where the spent nuclear fuel reprocessing plant of Japan Nuclear Fuel Ltd has been undergoing test operation since March 2006. Seawater samples were collected with a large volume in situ filtration and concentration system at different depths in the water column. 137Cs in particulate form could not be detected in the survey area. Dissolved 137Cs showed temporal variation, especially in the surface water. Based on the results, it was concluded that no observable 137Cs contamination was present in the investigated area. The distribution of 137Cs concentrations was influenced by the mixing between the Tsugaru and Oyashio Currents. |
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