Ren T S, Lin L Q, Chen Z P, Li G Y, Chen A M
Health Phys. 1987 Sep;53(3):219-25. doi: 10.1097/00004032-198709000-00001.
Passive integrating activated C detectors were used to study the regional distribution and temporal variation of 222Rn in indoor air in dwellings in the Beijing region. Measurements were made in 537 dwellings, which were either detached houses or multi-family apartments. The city-wide study was completed in 1985. The distributions are approximately log-normal with 90% of the dwellings having 222Rn levels less than 60 Bq m-3. The weighted average 222Rn concentration has been found to be 22.4 Bq m-3. Averages for detached houses and multi-family dwellings are 25.9 and 15.2 Bq m-3, respectively. Assuming an equilibrium factor of 0.5 and an occupancy factor of 0.8, the average equilibrium equivalent concentration of 222Rn progeny is 11.2 Bq m-3 and the annual average effective dose equivalent is 1.1 mSv.
采用被动积分活化C探测器研究了北京地区住宅室内空气中222Rn的区域分布和时间变化。在537套住宅中进行了测量，这些住宅既有独栋房屋，也有多户公寓。全市范围的研究于1985年完成。分布近似对数正态分布，90%的住宅222Rn水平低于60 Bq m-3。已发现加权平均222Rn浓度为22.4 Bq m-3。独栋房屋和多户住宅的平均值分别为25.9和15.2 Bq m-3。假设平衡因子为0.5，居住因子为0.8，222Rn子体的平均平衡当量浓度为11.2 Bq m-3，年平均有效剂量当量为1.1 mSv。
