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Abstract one of the main sources of atmospheric polution with radioa ctive nuclides is uranium-238 radon-222 is the only element in the uranium decay series which is a gas it reaches the atmospheric air by diffusion through the pores of rocks and soil the sequence of disintigrations of each atom of radon through the stages represent-ed by its short-lived decay products or radon daughters can be represented schematically because of the very short mean life of ra c, its activity is taken at all times as equal to the activity of its parent ra c because radon and its decay products are energetic ox -emitte- rsthey have considerable health significance the radon decay pr-oducts are condensed on all surfaces including the surface of air-borne particles and this produces radioactive aerosols in the atmo-sphere. |