Measurement of the Mobility and the Diffusion Coefficient of Ultrafine Radioactive Particles in the Air

Abstract

The mobilities and diffusion coefficients of the decay products of a natural radioactive gas, 86Tn220, and of an artificial radioactive gas, 86Kr88, have been measured in filtered air. The study of the mobility of these radioactive ions has demonstrated the presence of four groups of ions, ThB+ and Rb+. Assuming that the different groups of ions correspond to an increase in the dimensions of these ions, it has been found that the agglomeration velocity of the most rapid ions increases with the irradiation of the air. Under the same conditions, measurements have been made of diffusion coefficients of neutral particles.