The discussion clarifies the distinction between fissionable and fissile materials. Fissionable materials are defined as nuclides capable of undergoing fission upon neutron capture, regardless of the energy level of the neutron. In contrast, fissile materials, such as uranium-235, can undergo fission with a high probability when exposed to low-energy thermal neutrons. Notably, uranium-238 is an example of a fissionable material that requires high-energy neutrons for fission, establishing that all fissile materials are fissionable, but not all fissionable materials are fissile.
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