Fissile Material 5
Fissile Material 5 : Nuclear Energy and Nuclear Disasters. General definition: Although sometimes used as a synonym for fissionable material, this term has acquired a more restricted meaning; namely, any material fissionable by low-energy (i.e., thermal or slow) neutrons. Fissile materials include U-235, U-233, Pu-239, and Pu-241. See: Fissionable Material. Definition specific to hazardous materials transportation Means plutonium-238, plutonium-239, plutonium-241, uranium-233, uranium-235, or any combination of these radionuclides. The definition does not apply to unirradiated natural uranium and depleted uranium, and natural uranium or depleted uranium that has been irradiated in a thermal reactor. Certain additional exceptions are provided in 49 CFR 173.453
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