fissile materials
Defined in 1 dictionary — U.S. Code
United States Code
50 U.S.C. § 2569 — in this section
The term “fissile materials” means plutonium, highly-enriched uranium, or other material capable of sustaining an explosive nuclear chain reaction, including irradiated items containing such materials if the radiation field from such items is not sufficient to prevent the theft or misuse of such items.