Wake D, Brown R C, Trottier R A, Liu Y
Health and Safety Executive, Sheffield, U.K.
Ann Occup Hyg. 1992 Dec;36(6):629-36. doi: 10.1093/annhyg/36.6.629.
The filtration efficiencies of respirator filters and filtering facepieces have been tested against radon daughters in a fluorspar mine. The test method involved the use of sampling filters exposed to natural radon daughters in air filtered by the test respirators. Respirators with a filtration efficiency high enough for them to be considered suitable for use against toxic dusts generally reduced radon daughter levels by 90% or more, though nuisance dust masks were ineffective. The measured penetration of radon daughters through the former types of filter correlated reasonably well with the penetration of 0.1 microns neutralized monodisperse aerosols, and with that of the BS 4400 sodium chloride aerosol, measured in the laboratory. To simulate exposure in working conditions mine air containing radon daughters was drawn through the test filters for 8 h, but their performance was not affected and they were not measurably radioactive as a result.
在一个萤石矿中，针对氡子体测试了呼吸过滤器和过滤面罩的过滤效率。测试方法包括使用采样过滤器，使其暴露于经测试呼吸器过滤的空气中的天然氡子体。过滤效率高到足以被认为适用于防护有毒粉尘的呼吸器，通常能将氡子体水平降低90%或更多，不过防微尘口罩却没有效果。所测得的氡子体透过前几种过滤器的穿透率，与在实验室中测得的0.1微米中和单分散气溶胶以及BS 4400氯化钠气溶胶的穿透率有较好的相关性。为模拟工作条件下的暴露情况，含有氡子体的矿井空气通过测试过滤器抽取8小时，但它们的性能并未受到影响，且最终也未检测到具有可测量的放射性。
