Fissile Material 8
Fissile Material 8 : Nuclear Energy and Nuclear Disasters. Uranium-233, uranium-235, plutonium-239, plutonium-241, or any combination of these radionuclides. Excepted from this definition are: (a) natural uranium or depleted uranium which is unirradiated, and (b) natural uranium or depleted uranium which has been irradiated in thermal reactors only. As with radioactive material, this is not a scientific definition, but one designed to serve a specific regulatory purpose