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The short-lived decay products of radon, an inert gas that is one of the
natural decay products of uranium. The short-lived radon progeny (i.e.,
polonium-210, lead-214, bismuth-214, and polonium-214) are solids and
exist in air as free ions or as ions attached to dust particles. The U.S.
Mine Safety and Health Administration has established radiation protection
standards that limit a miner's radon progeny exposure to a concentration
of 1.0 WL and an annual cumulative exposure to 4 WLM. Each WLM is
determined as a 173-h cumulative, time weighted exposure.
Syn: radon daughter
Source:
Dictionary of Mining, Mineral, and Related Terms
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