Protection from the Daughter Products of Radon Through the Use of a Powered Air-purifying Respirator

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Abstract
The protection afforded by a powered air-purifying respirator against radon daughters has been evaluated under physiological working conditions in air concentrations of daughter products in excess of 10-8 Ci/l. The tests demonstrated that this device could reduce the exposure to the radon daughters by factors of greater than 1000. Since the respirator filter did not remove the radon the actual degree of protection afforded by the device in a radon-radon daughter atmosphere was evaluated. Several different methods for calculating dose were used and the results compared. It is suggested that a conservative protection factor of 20 be utilized for such devices until the critical regions of the lung affected by exposure to radioactivity in mines are identified.

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