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In this paper the results of indoor radon surveys in three geologically different regions in Serbia were presented and analyzed according to the influence of nearby soil. The activity concentrations of natural radionuclides in the soil samples were determined by gamma spectrometry and indoor radon were measured applying the method of adsorption on activated charcoal. Possible correlations between radium content in building soil and indoor radon concentrations in houses were investigared for low, medium and high radon levels. Three distinguished regions of Serbia with different geological substrate were selected for this study: the agricultural region of Vojvodina, the region of Kosovska Mitrovica in industrial and mining complex of Trepča and the potential Radon Priority Area RPA – settlement Niška Banja. Very high concentrations of radium were observed in the soil near buildings with significantly elevated concentrations of radon around 10,000 Bq m-3. To explore surface exhalation rate of radon from the soil samples the method based on direct radon measurements in closed circulation of air from the exhalation chamber by active radon monitor RAD7 was used. The contribution of radon exhalation from the surface soil to the total indoor radon was estimated and discussed.