Abstract
The Arctic and Antarctic ice sheets maintain records of the atmospheric fallout in their datable strata. The 240Pu 239Pu ratios in these polar reservoirs uniquely distinguish particulate fallout from the pre-moratorium nuclear atmospheric weapons tests, dominated by the U.S., and the post-moratorium atmospheric weapons tests, dominated by the U.S.S.R. Thus, they offer the possibility of use as a geochronological tool for some marine, glacial, lacustrine and soil systems.
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