Radiocarbon Activity Variation in Dated Tree Rings Grown in Mackenzie Delta

• Published in: Radiocarbon
• Main Authors: Fan, C Y, Tie-Mei, Chen, Si-Xun, Yun, Kai-Mei, Dai
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1983
• Subjects: General Earth and Planetary Sciences; Archeology; Canada; Mackenzie Delta
• Online Access: http://dx.doi.org/10.1017/s003382220000549x; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003382220000549X

Forty-five tree rings (1881–1925) were taken from a white spruce grown near Campbell River in Mackenzie Delta, Canada, for the measurement of 14 C activity variation. Because of the narrowness of the rings, 2 and sometimes 3 rings were combined to yield a total of 21 specimens. The 14 C 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.