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Measurements of the Decay Rate of the Gross Beta Activity in Firn Samples from an Alpine Glacier, Kesselwandferner, Ötztal Alps, Austria
W. Ambach and W. Rehwald
Arctic and Alpine Research
Vol. 14, No. 2 (May, 1982), pp. 163-166
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1551115
Page Count: 4
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The effective half-life of the gross beta activity of firn samples from depth cores of the accumulation area of the Kesselwandferner, Ötztal Alps, Austria, has been measured. With increasing depth the effective half-lives of the samples rise systematically, according to their sequence of deposition. The dependence of the effective half-life from the age of the samples shows that after 5000 d the long-living nuclides 137Cs and 90Sr are dominant. It is concluded that the peak values of the gross beta activity in layers from the period of heavy nuclear weapon tests in the atmosphere in the years 1961 to 1963 can be used as reference levels for dating firn cores for further decades.