SURVEY FOR INDOOR RADON IN DWELLINGS ON THE TERRITORIES SUPERVISED BY FMBA OF RUSSIA

The purpose of the work was to obtain data about the level of population radon exposure on the surveyed settlements.Methods. Surveys were carried out by the integral track method with the use of the track chambers REI-4 from the kit TRACK-REI-1M. Were surveyed dwelling, schools, kindergartens and business premises. Duration of the each exposure was 2-4 months. The measured value was radon volume activity, then effective equilibrium radon concentration (EEC) was calculated using the values of the equilibrium coefficient F=0,5. Effective dose from radon was calculated using a dose coefficient 9•10-6mSv/(hour•Bq/m3). Describe theorganizational aspects of the surveys are described.Results. Survey of the premises to radon were conducted in the settlements of 26 administrative units for several seasons in 2008–2013. The surveyed settlements are cities with multi-storey or mixed buildings sites. The number of inspected premises in the settlement in one measurement period typically ranged from 100 to 200. Most premises were surveyed at least for two seasons (warm and cold). The total number of measurements is about 5300. The summarized results for all settlements were obtained: intervals and average values of the radon EEC, doses fromradon, the proportions of premises with EEC less than 100, 200 and 400 and more than 400 Bq/m3. The calculatedannual doses to the population from radon in a number of settlements are presented. Conclusion.Summarized information about the exposure of the population to radon are obtained. It is shown that «winter» radon EEC values not always exceeds summer values. For part of the settlements we can see even opposite picture. Criteria for assessing the relevance of the «radon situation» in the settlement are proposed. Based on the results of performed surveys the settlements ranked using this criterion.