广州地区教学环境空气中氡浓度调查

Investigation of Indoor Air Radon Concentration in Colleges in Guangzhou

目的研究广州地区教学环境空气中氡浓度,探讨教学环境氡的来源。方法于2005年3—4月,8—9月,运用瞬时测量和累积测量方法进行室内空气中的氡浓度测量,并调查教室面积、装修时间、通风条件对氡浓度的影响,昼夜、季节与氡浓度的关系。结果广州地区教学环境室内空气中氡浓度为(34.2±21.17)Bq/m3,新建筑物室内空气中氡浓度[(36.6±25.5)Bq/m3]高于旧建筑室内氡浓度[(20.1±8.48)Bq/m3],夜晚室内空气中氡浓度高于白天,6:00—7:00为最高值(165.6Bq/m3),冬季室内空气中氡浓度[(54.2±15.11)Bq/m3]高于夏季室内氡浓度[(17.3±7.31)Bq/m3]。结论广州地区教学环境空气中氡浓度算术平均值在我国标准范围内,教学环境空气中氡浓度在外界条件改变时有差异。

Objective To investigate and analyze the recent condition of the indoor air radon concentration in the colleges in Guangzhou and to find the source of radon in the teaching environments and to make the effective measure to reduce indoor air radon pollution. Methods The radon concentration was determined with the instantaneous and accumulate methods. The effecting factors were analyzed. Results The arithmetic average of radon concentration was about (34.2±21.17) Bq/m3. The indoor radon concentration in the newly decorated buildings was about (36.6±25.5) Bq/m3 which was higher than that in the old ones (20.1±8.48) Bq/m3. The indoor radon concentration in the night was higher than that in the daytime. In winter it was about (54.2±15.11)Bq/m3 which was higher than that (17.3±7.31) Bq/m3 in summer. Conclusion The radon concentration may change as the outside condition changes, the radon concentration in the teaching environment in Guangzhou is not over the standard limit.