Abstract
Simultaneous daily samples of nuclear bomb debris have been statistically analysed based on the assumption that day-to-day variations are due to compression or dilution of a basic population. Monthly normalized standard deviations are presented from October 1956 to December 1964. Sorting of results into dry and rainy weather collections suggests that the “quantums” of radioactivity of individual particles are greatest when the bomb debris is collected in rain, indicating that most of the collection in rain is due to the larger particles acting as condensation nuclei. Natural aerosols have a similar size range. This suggests a variation of life-time with aerosol size. Some aspects are illustrated by computation of apparent life-time of gross aerosols, when two groups are in steady state with respect to radon daughters. Apparent life-time is shorter for the RaB/RaD than for the RaD/RaF ratio. Published measurements are discussed. DOI: 10.1111/j.2153-3490.1966.tb00266.x
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