Determination of the Tropospheric Residence Time of Lead-210

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Science  21 Sep 1962:
Vol. 137, Issue 3534, pp. 994-995
DOI: 10.1126/science.137.3534.994


The ratios of bismuth-210 to lead-210 in rain samples were used to calculate tropospheric residence time for lead-210. The value of about 6 days thus obtained agrees closely with the average interval between two rainfalls.