Distribution of Radioactivity on a Polydisperse Aerosol by the Diffusion Method

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Abstract
A mathematical method has been developed for obtaining information on the distribution of radioactivity on particles in different size ranges from 1 or 2 measurements of the diffusion rate of polydisperse radioactive aerosols. The method is very widely applicable since it makes no assumption regarding the particle size distribution of the radioactive aerosol. Results with the form "at least a certain fraction a of the activity is on particles equal to or less than a certain size" may be obtained from a single measurement. For 2 measurements, the upper and lower limit on the quanity a may be delineated. For certain combinations of diffusion devices and particle size distributions, the method will give valuable information. In other cases, the precision of the method is low and worthwhile information cannot be obtained. Further theoretical analysis should establish the most valuable range of applicability of the method.

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