4.5 Article

239Pu, 240Pu, 241Pu, 241Am, 137Cs, and 210Pb in seafloor sediments in the western North Pacific Ocean and the Sea of Japan: distributions, sources and budgets

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SPRINGER
DOI: 10.1007/s10967-022-08332-y

关键词

Western North Pacific Ocean; Sea of Japan; Seafloor sediment; Atmospheric nuclear weapons testing; Pacific Proving Grounds; Particle scavenging

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  1. Ministry of Education, Culture, Sports, Science and Technology, Japan
  2. Secretariat of the Nuclear Regulation Authority, Japan

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This study investigated the vertical distribution, behavior, and sources of radionuclides in seafloor sediments in the western North Pacific Ocean and the Sea of Japan. The results showed that a significant amount of anthropogenic radionuclides, such as Pu and Am, has been transported by ocean currents and accumulated in the seafloor sediments.
Vertical distributions of Pu-239, Pu-240, Pu-241, Am-241, Cs-137, and Pb-210 concentrations, and Pu-240/Pu-239 ratios were determined in seafloor sediments in the western North Pacific Ocean and the Sea of Japan to discuss the behavior of these radionuclides in the ocean and to identify the sources of anthropogenic radionuclides in the seafloor sediments. The excess Pb-210 accumulation rates were greater than the predicted rates from the overlying water column. A significant amount of the Pacific Proving Grounds-derived Pu and Am has been transported by ocean currents and it has been accumulated onto the seafloor sediments by enhanced particle scavenging.

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