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Half-Life Determination of 41Ca and Some Other Radioisotopes

Published online by Cambridge University Press:  18 July 2016

Walter Kutschera ,
Irshad Ahmad  and
Michael Paul
Walter Kutschera
Affiliation:
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 USA
Irshad Ahmad
Affiliation:
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 USA
Michael Paul
Affiliation:
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 USA
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Abstract

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We have performed a new determination of the half-life of 41Ca by measuring the specific activity of an enriched Ca material with known 41Ca abundance. We measured the activity via the 3.3-keV X-rays emitted in the electron capture decay of 41Ca, and the 41Ca abundance was measured by low-energy mass spectrometry. The result, t1/2 = (1.01 ± 0.10) × 105 yr, agrees with the recent ‘geological’ half-life of Klein et al., (1991), t1/2 = (1.03 ± 0.07) × 105 yr, and with the corrected value of Mabuchi et al. (1974), t1/2 = (1.13 ± 0.12) × 105 yr. We recommend the weighted mean of these three measurements, t1/2 = (1.04 ± 0.05) × 105 yr, as the most probable half-life of 41Ca. We also discuss the situation of the radioisotopes, 32Si, 44Ti, 79Se and 126Sn, whose half-lives, though still uncertain, are potentially interesting for future AMS studies and other applications.

Type
I. Sample Preparation and Measurement Techniques
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 436 - 446
Copyright
Copyright © The American Journal of Science 

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