MSHA - Code of Federal Regulations - 30 CFR 57.5046
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MSHA - Title 30 CFR
30 CFR § 57.5046
Protection against radon gas.

Where radon daughter concentrations exceed 10 WL, respirator protection against radon gas shall be provided in addition to protection against radon daughters. Protection against radon gas shall be provided by supplied air devices or by face masks containing absorbent material capable of removing both the radon and its daughters.

For further information: See MSHA's Program Policy Manual