直流电晕氡子体气溶胶采样法的采样效率研究

研究了直流电晕法采集氡子体气溶胶的采样效率,推导出基于多针对板结构的采样器的采样效率计算公式。以蚊香燃烧产生的固体颗粒作为氡子体的气溶胶载体,在此基础上分别研究了注入功率、温度以及相对湿度三个主要因素对采样效率的影响。结果表明,在电晕放电条件下随着注入功率的增加,采样效率随之增加并达到一个稳定最大值。其次,温度和相对湿度对采样效率的影响均符合线性增加的规律,并且相对湿度的影响比温度的影响要大。最后,在采样器设定结构参数条件下,最佳外施电压为11 k V,此时采样效率为0.453,并且采样器的测量值与Alpha PM测量值一致性非常高,能够满足空气环境中氡子体气溶胶浓度测量要求。

Research on the Collecting Efficiency of Radon Daughter Aerosols Based on DC Corona Method

The collection efficiency of radon daughter aerosols collector based on DC corona method was researched in this paper, by which calculating formula of collection efficiency of collector with multi-electrode-to-plate structure was obtained.The impact on collecting efficiency of fundamental factors such as electric power injection, temperature and relative humidity was considered by using radon daughter aerosols that are composed of solid particles resulted from mosquito-repellent incense burning.It turned out that, firstly, collection efficiency went up to a stable maximum value with the increasing of electric power injection of DC corona.Secondly, compared to temperature, relative humidity has a stronger impact on collection efficiency in linear increase rules.Eventually, optimal corona voltage for the collector with default structure parameters is 11 kV, and collection efficiency 0.453.The collector had highly consistent measured values with Alpha PM, which satisfies the requirement of measuring the radon daughter aerosols in atmosphere.