Radiocarbon Activity Variation in Dated Tree Rings Grown in Mackenzie Delta

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

Archaeology · Astronomy · Astrophysics · Delta · Dendrochronology · Geography · Liquid scintillation counting · Mineralogy · Physical geography · Physics · Radiocarbon dating · Radiochemistry · Archaeology and ancient environmental studies · Chemistry · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Geology · Paleontology

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