Abstract
Between July 1978 and July 1979, monthly samples of water collected near the mouth of the Columbia River were analyzed for Pu and Am to budget the annual quantity of these radionuclides exported to the adjacent coastal zone. During this period, approximately 70mCi of 239, 240Pu and 17 mCi of 241Am were carried by the river to the ocean. From the depositional history of a fine-grained sediment core raised from within the Columbia River estuary, an estimated 4–8 Ci of 239, 240Pu and 1–2 Ci of 241Am have entered the north-east Pacific Ocean by river transport since the late 1950s. This input would have increased the transuranic inventories in adjacent coastal sediments by at most 2·5 times those expected as a result of direct atmospheric fallout.
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