Assessment of Dose Loads and Radiation Risk as a Result of Exposure to Radon on Basement and Basement Workers in Novosibirsk

For Novosibirsk, the problem of high radon hazard is relevant. This is confirmed by statistics from government reports, maps of potential radon hazards and dose loads. The reason for the high radon hazard is hornblendebiotite granites with numerous occurrences and ore occurrences of natural radionuclides: uranium U-238 and thorium Th-232, on which about 70 % of the city's territory is located. As a consequence, in certain areas of the city high values of volumetric activity of the decay product <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathrm{U}(\text{Ra})$</tex> of radon <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{Rn}-222$</tex> are observed. The purpose of the work is to estimate the annual effective individual dose load from radon and its daughter decay products and the lifetime risk of death from lung cancer caused by exposure to radon and its decay products during one calendar year in the workplace. As a result of the study, it was established that the average value of radon equivalent equilibrium volume activity and dose load is within the limits of the standard requirements. However, premises have been identified where the dose load exceeds the permissible level of radiation and leads to an increased risk of morbidity and death from lung cancer.