【摘要】 本文介绍了一种以评价暴露量为目的的2 2 2 Rn、2 2 0 Rn子体累积测量仪。该测量仪使用固体径迹片CR 3 9为探测元件 ,用小型静音泵进行滤膜采样 ,之后蚀刻、读数 ,通过径迹密度分别求算2 2 2 Rn、2 2 0 Rn平衡当量浓度 (EECRn 、EECTn)。在采样时间为 2 4h ,采样流速为 0 .8L/min的条件下 ,EECRn 和EECTn的探测下限分别为 0 .5 7Bq·m- 3和 0 .0 7Bq·m- 3。最后介绍了使用该测量仪于 2 0 0 1年春在广东省珠海市进行环境2 2 2 Rn、2 2 0 Rn子体的测量结果更多还原

【Abstract】 For the purpose of evaluating the exposure due to inhalation of 220 Rn and its progeny, a new method of integrating monitor of 222 Rn/ 220 Rn progeny was developed and introduced in detail in this paper. The progeny of 222 Rn and 220 Rn in air are collected on the surface of a membrane filter through a micro pump. Based on the track etching technique(CR 39), the equilibrium equivalent concentrations of 222 Rn and 220 Rn can be calculated. The lower detection limits for EEC Rn  and EEC Tn  are 0.57 Bq·m -3 and 0.07 Bq·m -3 respectively when sampling time is 24 hours at a stable flow rate of 0.8 L/min. Furthermore, rather high 222 Rn and 220 Rn progeny concentrations was observed in Zhuhai city during a small survey with the newly developed monitor. (更多还原