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采用双滤膜筒测氡、抽气三段法测氡子体的方法,测得上海市区地下建筑物内氡及其子体(RaA、RaB和RaC)浓度分别为80.6Bq·m~(-3)和48.8Bq·m~(-3)、47.9Bq·m~(-3)、34.0Bq·m~(-3)。计算得氡子体潜能和平衡因子分别为 11.3×10~(-3)WL和 0.43。估算了地下建筑内作业人员接受地下室氡子体人均年有效剂量当量为1.24mSv。讨论了地下建筑降低氡浓度的防护措施。
The method of measuring radon progeny with three-stage method of measuring radon and pumping gas by double-filter membrane tube was adopted. The concentrations of radon and its daughter (RaA, RaB and RaC) in underground buildings in Shanghai were measured as 80.6Bq · m ~ -3) and 48.8Bq · m -3, 47.9Bq · m -3, 34.0Bq · m -3, respectively. The calculated radon potential and balance factor were 11.3 × 10 -3 WL and 0.43, respectively. The per capita effective equivalent dose of radon progeny in basements was estimated to be 1.24 mSv for underground operators. The protective measures to reduce radon concentration in underground buildings are discussed.