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Depositional history of artificial radionuclides in the Ross Ice Shelf, Antarctica

1979; Elsevier BV; Volume: 44; Issue: 2 Linguagem: Inglês

10.1016/0012-821x(79)90169-9

1385-013X

Minoru Koide, Robert L. Michel, Edward D. Goldberg, Michael Herron, Chester C. Langway,

Geology and Paleoclimatology Research

The annual fluxes of artificial radionuclides (238Pu,239+240Pu,241Am,137Cs,90Sr and3H) from the atmosphere to the Ross Ice Shelf in Antarctica were determined from measurements in strata dated by210Pb. Recognizable sources include the U.S. tests (Mike-Ivy and Castle Hill) in the early 1950s, the U.S.S.R. tests of the early 1960s, the SNAP-9A burnup of 1964 and the French and Chinese tests in the late 1960s and 1970s. There are several problems still awaiting resolution: the differences in atmospheric chemistries of fission products and of transuranics produced in weapons tests and the anomalous fluxes of238Pu to the ice shelf which do not appear to reflect a one-year stratospheric residence. There is no evidence for a smearing of the fallout record as a consequence of diffusion of these radionuclides in the glacial column.