Further Studies on Radiocolloids

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Abstract
Summary: The continuous measurement of the diffusion of radiocolloids is made possible by use of a photomultiplier tube viewing a ZnS-covered and thin walled glass capillary inside which the α-radiating particles diffuse in aqueous suspension and get adsorbed at the surface. The method was shown to yield satisfactory results for the particle size of alumina powder of known grain size distribution tagged with (Pb+Bi)-212 or Po-210. Po-210 radiocolloids were found to have an average radius of about 10-4 cm and a "specific" radioactivity of about 10-4 whereas the values for radioactive particles generated by decay of Rn-220 in very pure water were 10-6 cm and about 10-4. This means that "pure" (carrierfree) radiocolloids could not be shown to exist.

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