Estimation of Total Amounts of Anthropogenic Radionuclides in the Japan Sea
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概要
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We estimated the total amounts of anthropogenic radionuclides, consisting of 90Sr, 137Cs, and 239+240Pu, in the Japan Sea for the first time based on experimental data on their concentrations in seawater and seabed sediment. The radionuclide inventories in seawater and seabed sediment at each sampling site varied depending on the water depth, with total inventories for 90Sr, 137Cs, and 239+240Pu in the range of 0.52–2.8 kBq m−2, 0.64–4.1 kBq m−2, and 27–122 Bq m−2, respectively. Based on the relationship between the inventories and the water depths, the total amounts in the Japan Sea were estimated to be about 1.2±0.4 PBq for 90Sr, 1.8±0.7 PBq for 137Cs, and 69±14 TBq for 239+240Pu, respectively; the amount ratio, 90Sr:137Cs:239+240Pu, was 1.0:1.6:0.059. The amounts of 90Sr and 137Cs in the Japan Sea were in balance with those supplied from global fallout, whereas the amount of 239+240Pu exceeded that supplied by fallout by nearly 40%. These results suggest a preferential accumulation of the plutonium isotopes. The data used in this study were obtained through a wide-area research project, named the “Japan Sea expeditions (phase I),” covering the Japanese and Russian exclusive economic zones.
- 社団法人 日本原子力学会の論文
- 2007-06-25
著者
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KAWAMURA HIDEYUKI
Research Group for Environmental Science, Division of Environment and Radiation Sciences, Japan Atom
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ITO TOSHIMICHI
Research Group for Environmental Science, Division of Environment and Radiation Sciences, Japan Atom
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Otosaka Shigeyoshi
Research Group For Environmental Science Japan Atomic Energy Agency
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Kawamura Hideyuki
Research Group For Environmental Science Nuclear Science And Engineering Directorate Japan Atomic En
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Kawamura Hideyuki
Graduate Student Research Institute For Applied Mechanics Kyushu University
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Ito Toshimichi
Research Group For Environmental Science Nuclear Science And Engineering Directorate Japan Atomic En
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Kawamura Hideyuki
Research Group For Environmental Science Division Of Environment And Radiation Sciences Japan Atomic
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Ito Toshimichi
Research Group For Environmental Science Nuclear Science And Engineering Directorate Japan Atomic En
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Kawamura Hideyuki
Research Group For Environmental Science Division Of Environment And Radiation Sciences Japan Atomic
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