31 C.F.R. § 540.309 Natural uranium.
Title 31 - Money and Finance: Treasury
The term natural uranium means uranium found in nature, with an average concentration of 0.711 percent by weight of the isotope U235.
Title 31: Money and Finance: Treasury
PART 540—HIGHLY ENRICHED URANIUM (HEU) AGREEMENT ASSETS CONTROL REGULATIONS
Subpart C—General Definitions
§ 540.309 Natural uranium.
