[Estimation of doses of irradiation with radon-222 and its degradation products in adults of Tomsk].

The paper presents the results of statistical processing of experimental data on the volumetric activity of radon within the premises of various buildings. The results were used to estimate internal radiation doses of inhaled radon and its short-lived degradation products in the population of Tomsk. The average annual population-weighed value of the effective dose was 1.

[Factors determining the formation of radon levels inside buildings].

The theoretical and experimental investigation of radon levels inside dwellings of Tomsk was carried out. The statistical analysis of gathered results let us to reveal the significant factors, which define the formation of radon levels inside the buildings and dependencies of radon distribution. The significant factors are: building type (urban or rural), year season, floor level (is significant only for buildings of rural type), daytime and social factor includes habits and life stile of inhabitants.

[Radiation doses in children of the Tomsk region during inhalation of radon-222].

The paper presents the results of the studies of the levels of radon in the premises of 30 kindergartens and 36 schools of Tomsk and its region, which were conducted in 1989 to 2000. The volume activity of radon in the air of the premises was measured by using passive track detectors of gamma-radiation upon a long-term exposure of 1-3 months. In parallel with these measurements, statistical data required for a more accurate assessment of effective doses were collected.

[Criteria for the assessment of radon potential risk in territories].

The detailed analysis of criteria used in the different countries for an assessment of radon potential risk in territories was made. Such criteria as radon flux density from earth surface, radon concentration in soil air, specific activity of 226Ra in superficial soils were chosen. The analysis has revealed that the most reliable criterion is the value of equilibrium radon concentration in the soil air.

[The assessment of the impact of different radon sources into indoor air].

The contributions of different radon sources into total indoor radon level can differ in some times depending on geographical and climatic features of the locality, building characteristics, lifestyle and habits of the population. The revealing of most significant radon sources for examined locality and the assessment of their relative contributions will allow planning expected radon levels during building design stage. The analysis of the factors influencing indoor radon levels and the computation of radon enter to dwellings from different sources were carried out in Tomsk.