Distribution of plutonium isotopes in sediments of Melanesian Basin,Central Pacific |
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| Authors: | Wei Dong Jian Zheng Masatoshi Yamada Qiuju Guo |
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| Institution: | (1) Environmental Radiation Effects Research Group, National Institute of Radiological Sciences, Anagawa 491, Inage, Chiba 263-8555, Japan;(2) Department of Technical Physics, School of Physics, Peking University, Beijing, 100871, China; |
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| Abstract: | The anthropogenic plutonium isotopes are important geochemical tracers for environmental studies. The distributions and sources
of the Pu isotopes in water column or sediments of the North Pacific have been intensively studied. However, knowledge on
the distribution of Pu isotopes in sediments of the Central Pacific, when available, is limited. To study the composition
of Pu isotopes in the ocean, thus to identify the sources of radioactive pollution, sediment core samples were collected in
the Central Pacific by R/V Hakuho Maru in the KH-04-5 cruise. The activity concentrations of 239+240Pu and the 240Pu/239Pu atom ratio were determined using a sector-field inductively coupled mass spectrometry (SF-ICP-MS) combined with a high
efficiency sample introduction system (APEX-Q). Possible sources and sedimentation behavior of Pu isotopes are discussed. |
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