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Abstract
The concentration of Pb-210 has been measured at several altitudes in the atmosphere over the United Kingdom during 1958. The gradient into the lower stratosphere was less steep than observed by Burton & Stewart (1960) and conformed to the diffusion models of Jacobi & Andre (1963) for the case of short washout times, and Machta (1960). The concentrations of Pb-210 and Po-210 in surface air and Pb-210 in rainwater have been measured continuously since 1961. The ratio of Po-210/Pb-210 exhibits a seasonal variation during 1962 and 1963: this might be attributed to artificial production of Pb-210 during the weapon tests of 1961-2. An estimate has been obtained of the global deposition of Pb-210.DOI: 10.1111/j.2153-3490.1966.tb00254.x
