Criteria of radon risk of territories and methods for their determination

The paper analyzes the values used in the assessment of radon potential of territories. It was shown that the most reliable criterion in the assessment of radon risk of territories can be the value of radon activity concentration fixed at large depths. The authors proposed a simple method to assess this value and radon flux density from the soil surface, based on the measurement of radon activity concentration in soil gas at two twice differing depths and the diffusion model of transport. - Highlights: • Methods of radon potential territories determination have essential shortcomings. • Criterion of radon risk – radon activity concentration at large depths A_∞. • Proposed a simple method to assess A_∞