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The free radical method has been applied to the study of lead isotope abundance variations in the mining district of Sudbury, Ontario. The analysis of lead from various sulphides has yielded lead isotope ratios which are linearly related on a plot of Pb^/Pb204 vs. Pb''-^''/Pb204 with a slope of 0-131 0-003; the standard deviation of points from their best straight line is 0-37 per cent of the average Pb^/Pb204 value.
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