241Pu/239+240Pu ratios in polar glaciers |
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Authors: | Minoru Koide Edward D Goldberg |
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Institution: | Scripps Institution of Oceanography, La Jolla, CA 92093U.S.A. |
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Abstract: | The analyses of plutonium isotopes in dated strata of polar ice sheets indicate that the241Pu/239+240Pu activity ratio produced in the U.S.-dominated nuclear tests during the 1950s was about 26, while that in the U.S.S.R.-dominated weapons tests in the early 1960s was between 12 and 14. This difference provides time horizons for sedimentary deposits. Further, the239Pu/240Pu ratio may show a similar difference in fallout values from these two periods of weapons testing and may provide an additional, and perhaps more sensitive, chronology for sediments. |
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