When monitoring radioactive aerosol in the atmosphere, choosing a filter membrane with better surface collection characteristics and filtering efficiency will facilitate the improvement of the monitoring efficiency. In this paper, a developed calibration system for radioactive aerosol monitor was improved. A measurement device for filtering efficiency of filter membrane is added to the sampling and measurement unit. The device is tested using several commonly used filter membranes, and the measurements were compared with a general method. The results showed that the measurement proposed in this paper can quickly and accurately measure the filtering efficiency of various filter membranes. The deviation from general method is less than 2%.

在监测大气中的放射性气溶胶时，选择表面捕集特性和过滤效率较好的滤膜，有利于提高监测效率。本文对已开发的放射性气溶胶监测仪校准系统进行了改进。在采样测量单元中增加了滤膜过滤效率的测量装置。使用几种常用的过滤膜对该装置进行了测试，并将测量结果与一般方法进行了比较。结果表明，本文提出的测量方法可以快速、准确地测量各种滤膜的过滤效率。与一般方法的偏差小于2%。