US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 192 — HEALTH AND ENVIRONMENTAL PROTECTION STANDARDS FOR URANIUM AND THORIUM MILL TAILINGSSubpart E — Standards for Management of Thorium Byproduct Materials Pursuant to Section 84 of the Atomic Energy Act of 1954, as Amended192.4340 C.F.R. § 192.43Effective date.Last amended: 2016Year: 2026Length: 8 wordsOfficial source Cite as 40 C.F.R. § 192.43 (2026)Subpart E shall be effective December 6, 1983.Previous40 C.F.R. § 192.42