Browsing Radiocarbon, Volume 25, Number 2 (1983) by Subjects
Now showing items 1-1 of 1
Radiocarbon Activity Variation in Dated Tree Rings Grown in Mackenzie DeltaForty-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 per mil variation, anti-correlated with sunspot numbers. The physical implication is discussed.