FISSILE MATERIAL

Material containing a big number of easily fissionable nuclei which give off multiple neutrons in the fission process. Normal importance is that if a sufficiently big amount of fissile material is put together, a fission chain reaction can occur. Sometimes used synonymously with fissionable material, i.e., material that can be fissioned (though often under restricted circumstances, such as only with thermal (slow) neutrons). A more restricted importance use of fissile material limits the concept to those materials which can be fissioned by neutrons of all energies (fast & slow). Examples include Uranium-235 and Plutonium-239.

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