Size of aerosols-carriers of radon daughter products at the height up to 5 km

The disperse composition of atmospheric aerosols-carriers of daughter radon products was studied with the help of multilayer filters. The method is based on the selectivity of catching differently-sized particles with preliminarily calibrated fibrous filters. The threee-layer composition of fibrous materials used as the size analyzer allows to divide the observed particles according to their size into three groups (with the mean radius from 0.05 to 0.5 μm, above 0.2 μm and less than 0.05 μm). It has been found out that the distribution of radon daughter products in the troposphere according to the size of particles depends on the underlying surface of the observed territory, height of samplings, meteorological conditions, concentration and the spectrum of sizes of inert aerosols