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- W2408845045 abstract "Sediment cores collected during 1963--1985 from the Laptev and Chukchi Seas were analyzed for {sup 210}Pb, Pu isotopes and {sup 137}CS. The results are used to determine sedimentation rates, establish baselines of anthropogenic radionuclides, and study sources and pathways of anthropogenic radionuclides on the broad and shallow continental shelves bordering Siberia and Alaska. Apparent sedimentation rates determined for 7 cores using excess {sup 210}Pb vary between 0.2--0.7 cm/year. Down-core inventory of {sup 239,240}Pu based on five cores collected in 1985 from the Chukchi Shelf varies between 0.14--0.29 dpm/cm{sup 2}, which is comparable to that measured in soils of Fairbanks, Alaska. The {sup 240}Pu/{sup 239}Pu atom ratio throughout these Chukchi Shelf cores (0.184{+-}0.005) indicates that global fallout is the dominant and probably only source of Pu to that area. In comparison, a core collected in 1963 from the Laptev Sea (NW63-101) showed a much lower {sup 239,240}Pu inventory (0.024 dpm/CM2). Of particular interest is the pronounced variation of the {sup 240}Pu/{sup 239}Pu ratio in core NW63-101, which varies between 0.1827+0.0019 in the 0--3 cm interval and 0.0390{+-}0.0021 in the 5--10 cm interval, suggesting that global fallout and incidental release from fuels reprocessing activities are the dominant sources of Pu to themore » site during the periods of 1959--1963 and 1950--1957, respectively. Implications of these and other data on radionuclide contamination within the Arctic Ocean resulting from waste management practices of the Former Soviet Union will be discussed.« less" @default.
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- W2408845045 date "1995-12-31" @default.
- W2408845045 modified "2023-09-27" @default.
- W2408845045 title "Sources and fluxes of plutonium isotopes along the margin of the Arctic Ocean" @default.
- W2408845045 hasPublicationYear "1995" @default.
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