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239+240Pu and 137Cs in Sediments from Tokyo Bay: Distribution and Inventory

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Abstract

Four sediment cores were collected from Tokyo Bay and analyzed for their 239+240Pu and 137Cs concentrations. Shallow nearshore sediments from Tokyo Bay have 239+240Pu inventories which average 214±14 MBq/km2. They are five times greater than the supply expected from the atmospheric global fallout at the same latitude of 42 MBq/km2. The measured mean 137Cs inventory of 433±93 MBq/km2 is approximately one fifth the value expected from global fallout. Furthermore, the 239+240Pu/137Cs activity ratios, with a mean ratio of 0.50±0.14, are significantly greater than the ratio expected from the global fallout of 0.021. Excess 239+240Pu inventories can be considered to have been introduced into Tokyo Bay as weathering products by soil erosion, transported via rivers and winds, and to be much more efficiently scavenged from seawater by particles resuspended at the sediment-water interface.

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Authors and Affiliations

  1. Geochemical Research Section, Research Center for Radioecology, National Institute of Radiological Sciences, Isozaki 3609, Hitachinaka, Ibaraki, 311-1202, Japan

    M. Yamada

  2. Geochemical Research Section, Research Center for Radioecology, National Institute of Radiological Sciences, Isozaki 3609, Hitachinaka, Ibaraki, 311-1202, Japan

    Y. Nagaya

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  1. M. Yamada
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  2. Y. Nagaya
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Yamada, M., Nagaya, Y. 239+240Pu and 137Cs in Sediments from Tokyo Bay: Distribution and Inventory. Journal of Radioanalytical and Nuclear Chemistry 245, 273–279 (2000). https://doi.org/10.1023/A:1006741917854

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