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41Ca Concentrations in Modern Bone and Their Implications for Dating

Published online by Cambridge University Press:  18 July 2016

Roy Middleton ,
David Fink ,
Jeffrey Klein  and
Pankaj Sharma
Roy Middleton
Affiliation:
Department of Physics, University of Pennsylvania Philadelphia, Pennsylvania 19104
David Fink
Affiliation:
Department of Physics, University of Pennsylvania Philadelphia, Pennsylvania 19104
Jeffrey Klein
Affiliation:
Department of Physics, University of Pennsylvania Philadelphia, Pennsylvania 19104
Pankaj Sharma
Affiliation:
Department of Physics, University of Pennsylvania Philadelphia, Pennsylvania 19104
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Abstract

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We have made the first measurements without pre-enrichment of 41Ca in terrestrial rock and bone samples using accelerator mass spectrometry. Although the results in tufa deposits from Egypt are in good agreement with the saturation value of 8×10-15 predicted by Raisbeck and Yiou (1979), the average 41Ca:40Ca ratio of 2×10-15 (range: 0.6 to 4.2×10-15) that we measure in modern bone is an order of magnitude lower than that obtained previously by Henning, et al (1987) on a cow bone that was measured using AMS following isotope enrichment. The low value and the variability (more than a factor of seven) of the 41Ca:40Ca ratio in modern bone make the possibility of dating bones using 41Ca unlikely.

Type
I. Sample Preparation and Measurement Techniques
Information
Radiocarbon , Volume 31 , Issue 3: June 20-25, 1988 Dubrovnik, Yugoslavia , 1989 , pp. 305 - 310
Copyright
Copyright © The American Journal of Science 

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