Radiation Protection

Subpart T: National Emission Standards for Radon Emissions From the Disposal of Uranium Mill Tailings

Rule Summary

Subpart T was originally established to limit radon-222 emissions from uranium mill tailingsHelptailingsThe remaining portion of a metal-bearing ore after some or all of a metal, such as uranium, has been extracted. piles that are no longer operational. In 1994, Subpart T was amended so that it no longer applied to facilities under license with Nuclear Regulatory Commission (NRC). Inactive uranium mill tailings piles at NRC-licensed facilities are subject to the radon control provisions in 40 CFR Part 192.

Additional Resources

View the July 15, 1994 Federal Register notice rescinding 40 CFR Part 61, Subpart T.


All facilities subject to any NESHAP must meet 40 CFR Part 61, Subpart A: General Provisions.