着用時における浄気式全面, 半面マスクの防護性能

概要

論文の詳細を見る
For selecting good-performing masks and estimating the protection provided by the masks, the leakage has been measured for six types of half mask and three types of full-face mask as worn. The cloud of submicron sodium chloride particles was generated within a test hood in which the subject wore his mask. The air sampled from inside the mask with a miniature pump was assessed by a flame photometer. The leakage was measured under four simulated working conditions such as normal breathing, smiling, moving head, and talking.The measured protection factors (defined as the ratio of the concentration of the test cloud outside the mask to that inside the mask) widely distributed from 10 to 3, 300 for the half masks and from 100 to 3, 300 for the full-face masks, depending on the persons and the working conditions. The values characterising the distribution of the protection factor for each mask are summarized.Based on these values, the performance of each mask and the effects of working conditions on the protection are discussed.