抄録
Half-face masks have been used routinely at plutonium facilities in the Power Reactor and Nuclear Fuel Development Corporation. In 1970, a mask man-test began to evaluate the protection efficiencies of masks when wearing and to instruct workers how to wear them properly. DOP was used as a test aerosol, and 232 persons were tested. In the first test 70% of the persons could wear the masks with a good fit (leak rate less than 1%). The persons with leak rate over 1% were repeatedly tested to investigate causes of the leak.
The persons were classified into three groups; the first one having experience of wearing masks, the second one having no experience and the third one being given some instructions about masks before the test. The persons in the first group weared the masks better than those in the second group, but the test suggest the instruction is the most effective.
The methods procedures and results of the tests are described.
