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 distribu- tion 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 col- lected in the Central Pacific by R/V Hakuho Maru in the KH-04-5 cruise. The activity concentrations of 239?240 Pu and the 240 Pu/ 239 Pu 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 sed- imentation behavior of Pu isotopes are discussed.
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