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Radiocarbon Activity Variation in Dated Tree Rings Grown in Mackenzie Delta

Published online by Cambridge University Press:  18 July 2016

C Y Fan ,
Chen Tie-Mei ,
Yun Si-Xun  and
Dai Kai-Mei
C Y Fan
Affiliation:
Department of Physics, University of Arizona, Tucson
Chen Tie-Mei
Affiliation:
Radiocarbon Laboratory, Archaeological Section, History Department, Peking University, Beijing, China
Yun Si-Xun
Affiliation:
Radiocarbon Laboratory, Archaeological Section, History Department, Peking University, Beijing, China
Dai Kai-Mei
Affiliation:
Department of Physics, Nanjing University, Nanjing, China
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Abstract

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Forty-five tree rings (1881–1925) were taken from a white spruce grown near Campbell River in Mackenzie Delta, Canada, for the measurement of 14C activity variation. Because of the narrowness of the rings, 2 and sometimes 3 rings were combined to yield a total of 21 specimens. The 14C content in these specimens was measured with a liquid scintillation-PM tube counter system of the History Department of Peking University. The data points exhibit a 10‰ variation, anti-correlated with sunspot numbers. The physical implication is discussed.

Information

Type
I. Natural 14C Variations
Information
Radiocarbon , Volume 25 , Issue 2: 11th International Radiocarbon Conference , 1983 , pp. 205 - 212
Copyright
Copyright © The American Journal of Science 

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