Affiliation: | 1. Central Laboratory, Marine Ecology Research Institute, 300 Iwawada, Onjuku-machi, Isumi-gun, Chiba, 299-5105, Japan 3. Environmental Radioactivity Office, Radiation Monitoring Division, Nuclear Regulation Authority, 1-9-9 Roppongi-First Bldg.,, Minato-ku, Tokyo, 106-8450, Japan 2. Marine Ecology Research Institute, 7F Towa-Edogawabashi Building, 347 Yamabuki-cho, Shinjuku, Tokyo, 162-0801, Japan
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