220Rn对Radtrak氡探测器的影响及其修正

对甘肃调查使用的Radtrak探测器进行了研究和改进。由于Radtrak探测器采用了高渗透性的滤膜，在暴露期间，²²⁰Rn可随²²²Rn进入探测器。传统土结构窑洞和房屋中高水平²²⁰Rn的影响，使得²²²Rn的测量结果高出实际水平2~3倍。通过改变气体交换率，对探测器进行了改进。改进后的探测器可有效分辨²²⁰Rn和²²²Rn。根据探测器的灵敏度和房间内²²⁰Rn的分布，提出了对甘肃调查数据修正的可能性，并与实际测量结果进行了比较。

Influence and Correction of 220Rn to Radon Measurement for Radtrak Detector

The Radtrak detector used in Gansu investigation was researched and developed. As a high permeable membrane filter for the detector, ²²⁰Rn enters detector with ²²²Rn during exposure period. Gansu cave and traditional dwellings constructed with loam bricks had a high level of ²²⁰Rn, and the measurement results of ²²²Rn were 2-3 times higher than the actual level due to the influence from ²²⁰Rn. The detector was improved by decreasing air exchange rate. Improved Radtrak-R-T detector can effectively distinguish ²²²Rn and ²²⁰Rn, and measure the both simultaneously. According to the sensitivities of the detector to ²²²Rn and ²²⁰Rn as well as the ²²⁰Rn concentration in the room, a correction way for the data of Gansu investigation was established，and the corrected data were compared with the actual measurement results in this area.