室内氡子体测量及其有效剂量估算

The Measurement of Indoor Radon Daughters and the Estimation of Their Effective Dose

运用α粒子连续空气监测仪Alpha-7A,采用连续测量滤纸上氡子体活度浓度的方法分别对地上和地下某室内环境氡子体浓度进行测量,就活度浓度变化的分析结果进行有效剂量估算。实验研究结果表明:环境因素对氡子体活度浓度值影响较大。一定测量时间范围内,218Po与214Po活度浓度随测量时间不断变化,且存在相对稳定值;212Po活度浓度随测量时间线性变化,线性变化斜率大小k与环境密切相关;氡子体α潜能所致年平均有效剂量的保守估算值均低于2000年调查结果。

Using the Alpha particles continuous air detector Alpha -7A, the tests take measurement of radon daughters activity concentration at a certain room on ground and underground using the way of taking measure- ment of radon progenies activity concentration on the filter paper. The effective dose is estimated through the changing activity concentration. The experimental results indicate that environmental factors have a great impact on the radon progeny activity concentration. Within a certain measuring time, the activity concentration of 218Po and 214Po is changing continually and a relatively stable value exists. The activity concentration of 212Po is in- creasing linearly. The slopes k is related to the environmental factor. The conservative estimated value of annual effective dose caused by α -potential energy is all below the 2000 survey results.