US lawArizonaRegulationsTitle 11 — MinesChapter 1 — State Mine InspectorR11-1-471R11-1-471R11-1-471. Exposure of radon daughtersLast amended: 1980Length: 21 wordsOfficial source Cite as Ariz. Admin. Code § R11-1-471No employee shall be permitted to receive an exposure of radon daughters in excess of 4 WLM in any calendar year.PreviousR11-1-470NextR11-1-472