Ratio of Thorium-230 to Thorium-232 in Deep-Sea Sediments

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Science  15 Dec 1961:
Vol. 134, Issue 3494, pp. 1978-1979
DOI: 10.1126/science.134.3494.1978


The ionium-thorium method for age determination in deep-sea sediments is critically reviewed, and its shortcomings are discussed. A method that allows an estimate of the rate of sedimentation in the superficial layer of the sediment is presented. A formula for calculating the error in age determination by the method is given for the case when the rate of sedimentation is changing and, with it, the rate of thorium-232 sedimentation.