【摘要】 本文描述了一种建筑物表面氡析出率的直接探测技术。将装有一定量的活性炭盒直接扣于建筑物表面,收集所扣面积上析出的氡,累积一定时间后,在γ谱仪上测量氡子体特征峰以确定累积的氡量,从而求出累积期间平均氡析出率。此方法的累积3天最小可探测下限为1.2mBq·m^-2·s^-1,其优点是采样与测量系统分开,操作简单,成本低,灵敏度高,适于较大范围氡析出的调查与研究。更多还原

【Abstract】 In order to obtain the value of radon exhalation rates from building surface, a plastic container loading activated carbon is directly put onto the building surface with its opening side towerds the surf ace and colle ctes radon passively. After a certain long time (about 3 days) , radon daughters are measured by φ75×75mm NaI (T1) gamma spectrometer to determine integrated radon.And then, average radon exhalation rates duriag the integration can be calculated. In this method, the minimnm limit of detection is 1.2 m Bq/(m2·s) for 72 hours.Besides higher sensitivity, the advantages of the method are: simple operation; no noise; sampling being separated from measuring. This method also makes it possible to carry out large scale survey in the exhslitioa of radon at a relatively low cost.更多还原