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Vertical profiles of 239+240Pu in seawater from the East China Sea |
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| Authors: | M Yamada T Aono |
| Institution: | (1) Nakaminato Laboratory for Marine Radioecology, Environmental Radiation Protection Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences Geochemical Research Section, Research Center for Radioecology, 3609 Isozaki, Hitachinaka, Ibaraki, 311-1202, Japan;(2) Nakaminato Laboratory for Marine Radioecology, Environmental Radiation Protection Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, 3609 Isozaki, Hitachinaka, Ibaraki, 311-1202, Japan |
| Abstract: | Seawater samples were collected from the East China Sea continental shelf and analyzed for 239+240Pu activities. The vertical profiles of 239+240Pu had a similarity for all three stations in the East China Sea. 239+240Pu concentrations were low in the surface layer (3-4 mBq/m3) and increased gradually with depth to become high in the near-bottom layer (7-10 mBq/m3). 239+240Pu concentrations in seawater and the concentrations of suspended particles showed almost the same vertical profiles in the East China Sea continental shelf. The maximum value of 239+240Pu found in the near-bottom layer may be due to the contribution of Pu-rich suspended particles. |
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