某地下建筑内天然放射性气溶胶粒度分布研究

Size Distribution of Natural Radioactive Aerosols in an Underground Building

天然放射性气溶胶粒度分布是评价氡暴露所致有效剂量的重要参数。本文采用撞击法对某地下建筑物室内天然放射性气溶胶的粒度分布进行试验研究,58个点位的4次测量表明:该建筑内天然放射性气溶胶粒度分布可采用单峰对数正态分布形式描述,活度中值空气动力学直径(AMAD)范围为0.087～0.427μm,平均值为0.194μm;AMAD主要分布在0.1～0.3μm之间,约占全部测量结果的85%。

The size distribution of natural radioactive aerosols is a very important factor for evaluating the exposure dose contributed by radon.In order to measure the size distribution,a cascade impactor was employed for sampling in an underground building.The results of 4-time measurements at 58 places show that the sizes of natural radioactive aerosols are lognormal distribution,and the AMAD is between 0.087 and 0.427 μm with an average of 0.194 μm.The AMADs ranging from 0.1 to 0.3 μm cover 85% of all data.