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      Characterization of plutonium in deep-sea sediments of the Sulu and South China Seas

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      Journal of Environmental Radioactivity
      Elsevier BV

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          Abstract

          Anthropogenic Pu isotopes are important geochemical tracers for sediment studies. Their distributions and sources in the water columns as well as the sediments of the North Pacific have been intensively studied; however, information about Pu in the Southeast Asian seas is limited. To study the isotopic composition of Pu, and thus to identify its sources, we collected sediment core samples in the South China Sea and the Sulu Sea during the KH-96-5 Cruise of the R/V Hakuho Maru. We analysed the activities of (239+240)Pu and the atom ratios of (240)Pu/(239)Pu using isotope dilution sector-field inductively coupled plasma mass spectrometry (SF-ICP-MS). The (240)Pu/(239)Pu atom ratios in the sediments of both areas (inventory weighted mean: 0.251 for the South China Sea and 0.280 for the Sulu Sea) were higher than the global fallout value (0.178+/-0.019), suggesting the existence of Pu from the Pacific Proving Grounds in the North Pacific. Low inventories of (239+240)Pu in sediments were observed in the South China Sea (3.75 Bq/m(2)) and the Sulu Sea (1.38 Bq/m(2)). Most of the Pu input is still present in the water column. Scavenging and benthic mixing processes were considered to be the main processes controlling the distribution of Pu in the deep-sea sediments of both study areas.

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          Surface circulation in the South China Sea

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            Fallout radionuclides in the Pacific Ocean: Vertical and horizontal distributions, largely from GEOSECS stations

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              Rates of sediment accumulation and particle reworking based on radiochemical measurements from continental shelf deposits in the East China Sea

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                Author and article information

                Journal
                Journal of Environmental Radioactivity
                Journal of Environmental Radioactivity
                Elsevier BV
                0265931X
                August 2010
                August 2010
                : 101
                : 8
                : 622-629
                Article
                10.1016/j.jenvrad.2010.03.011
                20403651
                d938a755-b6e2-4056-8f8d-b55f3dab7661
                © 2010

                http://www.elsevier.com/tdm/userlicense/1.0/

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