[Human radiation action of radon and its daughter disintegration products].

Radon-222 and its daughter disintegration products are present within all the buildings without except, which is an inevitable source of radiation both in the dwellings and in working places. There may be higher concentrations of radon in some regions. Seasonal radon level changes depending on ambient air temperature and atmospheric pressure have been found in the atmospheric ground layers. The results of the performed sanitary-and-epidemiological studies may state that there is a cause-and-effect relationship between the level of radon in the air of accommodations and the higher incidence of lung cancer. Radon-resistant structures of dwellings, removal of the soil sources of radon, as well as air filtration and efficient ventilation of premises are basic methods for decreasing the concentration of radon.