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CFR > Title 31 - Money and Finance: Treasury > SUBTITLE B—Regulations Relating to Money and Finance > CHAPTER V—OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY (parts 501 to 598) > PART 540—HIGHLY ENRICHED URANIUM (HEU) AGREEMENT ASSETS CONTROL REGULATIONS > SUBPART C—General Definitions (§540.301 to §540.319) > 540.306—Highly Enriched Uranium (HEU).
540.306—Highly Enriched Uranium (HEU).
The term highly enriched uranium or HEU means uranium enriched to twenty (20) percent or greater in the isotope U235.