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Cl-36 in polar ice, rainwater and seawaterConcentrations of the cosmogenic radioisotope Cl-36 in Antarctic ice, rain, and an upper limit of the seawater value are determined using van de Graaff accelerator high energy mass spectrometry. Cl-36 concentrations in Antarctic ice range between 2.5 to 8.7 x 10 to the 6th atoms Cl-36/kg, while those concentrations in samples collected at the Alan Hills ice field locations where meteorites have been brought to the surface by glacial flow and ablation are found to vary by more than a factor of three. This variation is attributed either to the effects of atmospheric mixing and scavenging or to radioactive decay in old ice. The Cl-36 concentration found in a present sample of rainwater is much lower than that reported in samples collected in the early 1960's, suggesting the occurrence of a decrease in the concentration of atmospheric Cl-36 derived from nuclear weapons tests over this time period.
Document ID
19810030024
Document Type
Reprint (Version printed in journal)
Authors
Finkel, R. C. (California Univ. La Jolla, CA, United States)
Nishiizumi, K. (California, University La Jolla, Calif., United States)
Elmore, D. (California Univ. La Jolla, CA, United States)
Ferraro, R. D. (California Univ. La Jolla, CA, United States)
Gove, H. E. (Rochester, University Rochester, N.Y., United States)
Date Acquired
August 11, 2013
Publication Date
November 1, 1980
Publication Information
Publication: Geophysical Research Letters
Volume: 7
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF 77-29843
CONTRACT_GRANT: NGL-05-009-148
Distribution Limits
Public
Copyright
Other