中文摘要：

被动沉积式222 Rn/220 Rn（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90d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0.234Bq.m-3和0.424Bq.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。

英文摘要：

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.