Exposure Standards For Uranium Mining

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Abstract
A discussion is presented of the suitability of the radon daughter WLM standard and the radon gas MPC standard for measurement of the potential harm from inhalation of uranium mine aerosols. Factors such as disequilibrium of radon daughters and their degree of unattachment to carrier aerosols influence the radiation dosimetry. Dose-enhancement factors derived for unattached daughters are used to modify the calculated WLs and allowable cumulative WLM exposures. It is concluded that even though the WL and MPC measurements offer comparable protection under exposure conditions typical of many mines, a standard based on WL focuses attention on the radon daughters (the principal hazard), rather than the precursor radon gas.

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