Measurement of lead-210 in surface air and precipitation

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Abstract
Lead-210 activity in ground level air and rainwater at a number of stations in India covering the latitude band 11° to 34° N has been studied and the data is presented. Seasonal variations in activity levels with maximum values in winter have been observed in the surface air at several stations. The time of occurrence of peak values of lead-210 differs from that of stratospheric cesium-137 but generally agrees with radon levels. It is therefore concluded that lead-210 is mainly controlled by radon activity in the ground level air. The possible reasons for the winter peak in radon and lead-210 are discussed. The latitudinal variation of lead-210 and the likely reasons for these are examined. The lead-210 activity levels in India are compared with the values reported by other laboratories for temperate latitudes. DOI: 10.1111/j.2153-3490.1969.tb00423.x

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