地下工程氡浓度监测与剂量评价

Radon Concentration Monitoring and Does Estimation in Underground Engineering

为了解某地下工程氡浓度水平,评估不同人群吸入氡及其子体所致年有效剂量,使用测氡仪对三个区域氡浓度进行了定期监测和连续监测。结果表明:地下工程氡浓度区域分布不均衡,高氡区浓度值约为低氡区的2倍,通风1~2 h后,高氡区氡浓度值下降约三分之一;区域氡浓度呈逐年下降趋势,连续三年剂量评估最大值分别为5.71 mSv、2.72 mSv、2.65 mSv,第一年的剂量评估最大值高于目标剂量限值3 mSv。测量结果可为环境条件改善、人员工作时间优化提供参考。

In order to understand the radon concentration level in an underground engineering and to evaluate the annual effective dose caused by the inhalation of radon and its progeny by different people,the radon concentration in three areas was monitored regularly and continuously by using radon measuring instruments.The results show that the regional distribution of radon concentration in underground engineering is unbalanced.The radon concentration in the high radon area is about twice as high as that in the low radon area.After 1 h to 2 h of ventilation,the radon concentration in the high radon area decreases by about one third.Regional radon concentration showed a decreasing trend year by year,and the maximum dose assessment values for three consecutive years were 5.71 mSv,2.72 mSv and 2.65 mSv,respectively,and the maximum dose assessment values for the first year were higher than the target dose limit of 3 mSv.The measurement results can provide reference for the improvement of environmental conditions and the optimization of working time.