【摘要】 采用双滤膜法和Thomas法对南京市地下建筑物内氡及其子体浓度分别进行了监测。应用UNSCEAR最新报告中的剂量转换因子,对地下建筑物内工作人员进行了内照射剂量估算;对影响地下建筑内氡及其子体浓度的通风情况作了初步探讨。结果如下:南京市地下建筑物内氡及其子体浓度均呈对数正态分布,两者的几何均值分别是40.5Bq·m^-3和1.4×10^-7J·m^-3,平衡因子为0.63,氡短寿命子体间的放射性平衡比为1:0.57:0.49,工作人员在地下建筑物内因吸入氡子体造成的年有效剂量当量为1.3mSv,高出当地居民86％。更多还原

【Abstract】 The results of concentration measuring of 222Rn and its daughters and estimation of internal doses to workers in the underground buildings at Nanjing city are presented. The double filtering membrane method and Thomas method were used in the monitoring of 222Rn and its daughters, and the dose conversion factor was taken from the latest UNSCEAR report. Concentration distributions of 222Rn and its daughters were approximately log-normal. The geometric means for 222Rn was 40. 5 Bq - m-3 and for its daughters was 1. 4X10-7 J - m-3. The equilibrium factor was 0. 63. The radioactive equilibrium ratio between short-lived 222Rn daughters was 1 s 0. 57 : 0. 49. The estimation value of annual effective dose equivalent from 222Rn daughters to workers working at underground sites was 1. 3 mSv, which was 86% higher than that of those working on ground sites.更多还原