Abstract
The relationship of a 210Pb bioassay system utilizing whiskers and the effects of the residence time of uranium mine ventilation air is presented. Inhalations of 210Pb and 222Rn were considered initially to be of minimal effect on the correlations between 210Pb in biological samples and exposures from short-lived radon daughters. However, dependent on the residence time of mine ventilation air, the short-lived daughters can contribute 6–75% of the total 210Pb intake per working level month, 210Pb in the ventilation air 0–94% and 222Rn 0–75%. Leakage of old mine air into the ventilation air streams increases the percentage of 210Pb in the ventilation air at the expense of the other two sources. The percentage of 210Pb atoms per working level month to 218Po atoms per working level month is constant for ventilation air of less than approximately 15-min residence time and for ventilation conditions where a minimum of old mine air blends into the ventilation air streams, 210Pb bioassay systems would overestimate the hazards associated with 218Po atoms under other ventilation conditions.
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