室内^(222)Rn/^(220)Rn子体平衡因子的初步测量

Primary Measure of Equipment Factor of ^(222)Rn/^(220)Rn Indoor

为了测量222Rn/220Rn子体水平及其与222Rn/220Rn浓度之间的平衡关系,采用连续测氡仪和氡钍子体连续监测仪,选择包头地区几种典型居室和工作场所,对其空气中222Rn/220Rn及其子体浓度进行测量。结果显示,工作场所和居室中222Rn平衡因子均值分别为0.35和0.43,工作场所和居室距墙壁20cm处220Rn平衡因子均为0.030;室内220Rn平衡当量浓度昼夜变化与222Rn类似,即白天低、晚上高;222Rn/220Rn浓度瞬时测量值与累积结果存在较大差异,平均比例分别为2.1和1.7。

The activity concentration of 222Rn,220Rn and their progenies of certain working places and dwellings in Baotou city were measured simultaneously.Based on these results,the equipment factor of 222Rn is 0.35 for working places and 0.43 for dwellings,while equipment factor of 220Rn measured at 20 cm distance from wall is 0.030 for both working places and dwellings.Preliminary results show that the temporal change of 220Rn equilibrium equivalent concentration is same as 222Rn which is high in midnight and low in afternoon,and significant difference between instant and accumulated measure result of 222Rn,220Rn activity concentration is found,with the factor of 2.1 and 1.7.