摘要
研究了可同时测量环境空气中220Rn及其子体放射性水平的双滤膜活性炭盒法。根据暂时平衡理论,推导了该方法测量空气中220Rn及其子体的理论公式,明确了取样和测量过程中需要注意的关键参数:对于滤膜过滤收集220Rn子体,应当使等待时间大于21.4 min,同时等待和测量时间之和小于7.41 h;对于活性炭盒吸附富集220Rn,应当使等待时间大于6.17 min。使用该方法测定了实验室和某花岗岩坑道内220Rn及其子体的放射性水平。主动式双滤膜活性炭盒法为环境空气中220Rn及其子体剂量评价提供了新的技术支持。
The double membrane activated charcoal method measuring 220 Rn and its progeny concentrations in ambient air simultaneously was established .According to the temporary equilibrium theory ,the theoretical for-mula of 220 Rn and its progeny in the air was derived in this method .Aiming at the half-life characteristics of 220 Rn and its progeny, classical theory model was modified and simplified , and several key time points was i-dentified.For 220 Rn progeny collection, the waiting time should be greater than 21.4 minutes after sampling, and the sum of waiting time and measuring time should be less than 7.41 hours.For 220 Rn gas adsorption, the waiting time should be greater than 6.17 minutes.The radioactivity levels of 220 Rn and its progeny in a laborato-ry and in a tunnel was studied by the method .It is provided a new technical support for 220 Rn and its progeny dose assessment by the active membrane activated charcoal method .
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2013年第8期985-989,共5页
Nuclear Electronics & Detection Technology
关键词
双滤膜活性炭盒法
^220Rn及其子体
剂量评价
the double membrane activated charcoal method
^220Rn and its progeny
dose assessment
