Measurements of radon exhalation rate in NORM used as consumer products in Japan.

Twenty-five beauty products known to contain natural radionuclides were collected, and their 222 Rn mass exhalation rates were measured. The effective doses to workers due to 222 Rn exhaled from these products were estimated. The 222 Rn mass exhalation rates of these products were below 177 μBq kg-1 s-1 and were almost identical to those of natural rocks in Japan. The maximum effective dose of 222 Rn exhaled from these products was 71 μSv y-1 .