Abstract
IT has been pointed out by several authors that the concentration of polonium-210 (radium-F) in rain water is lower than that which would result from the radioactive equilibrium between lead-210 (radium-D) and polonium-210 (radium-F)1,2 (the decay chain, it should be remembered, is: 
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References
Burton, W. M., and Stewart, N. G., Nature, 186, 584 (1960).
Lehmann, L., and Sittkus, A., Naturwiss., 46, 1, 9 (1959).
Lambert, G., and Nezami, M., Annal. Geophysique (in the press).
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LAMBERT, G., NEZAMI, M. Determination of the Mean Residence Time in the Troposphere by Measurement of the Ratio between the Concentrations of Lead-210 and Polonium-210. Nature 206, 1343–1344 (1965). https://doi.org/10.1038/2061343a0
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DOI: https://doi.org/10.1038/2061343a0
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