被动沉积法测量222Rn/220Rn子体浓度

被动沉积式²²²Rn/²²⁰Rn（Rn/Tn）子体测量对于现场环境Rn/Tn子体浓度调查和环境Rn/Tn暴露剂量评价具有重要意义。本工作利用自行开发的被动沉积式Rn/Tn子体测量仪，对被动沉积式Rn/Tn子体浓度测量方法进行了初步研究，探讨了其基本原理，并分析了其影响因素。研究表明，在粗略反映同一类型环境不同房屋Rn/Tn子体暴露水平差别的情况下，被动沉积法可用于Rn/Tn子体浓度的现场测量。暴露90 d时，本被动沉积式Rn/Tn子体测量仪测量Rn/Tn子体的探测下限分别为0.234 Bq•m^-3和0.424 Bq•m^-3。若将其应用于不同现场环境Rn/Tn子体浓度测量与暴露剂量评价，还需对该方法进行深入细致的研究。

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.