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Sediment cores collected during R. V. Polar Sea AOS94 expedition from the Chukchi Shelf to the North Pole were analyzed for several decay-series natural radionuclides and Pu isotopes to study sedimentation rates and pathways of radionuclides in the western Arctic Ocean. The measured sedimentation rates vary by more than three orders of magnitude along the transect, from 210Pb-based rates of 200–700...