Study on DepositionBased Measurement Method of ²²²Rn/²²⁰Rn Progeny Concentration

The passive integrated radon and thoron progeny measurement is quite important for the field survey and dose evaluation of ²²²Rn/²²⁰Rn (Rn/Tn) exposure in environment. This study concentrates on the deposition-based measurement method. The base principle was discussed, and the influence factors were analyzed. Using the newly developed deposition-based passive Rn/Tn progeny monitor, a series of experiment comparisons were carried out. The results show that only in reflecting the difference of Rn/Tn exposure in different environments, this method can be used for field measurement. The low level detection limits of self-made device for Rn/Tn progeny concentration are 0.234 Bq•m^-3 and 0.424 Bq•m^-3 respectively when exposure for 90 days. There are still a lot of improvement works needed in the future to apply this method for field measurement and dose evaluation of Rn/Tn exposure in different environments.