In recent years a number of case-control epidemiological studies have taken place and others are inprogress to evaluate the lung cancer risk to the general population from exposure to radon and itsshort-lived progeny in the indoor residential environment. While it is actually long term exposure overpast decades to radon progeny by inhalation that dominates lung doses, for a number of practicalreasons it is radon gas that is measured in these studies.
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