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Fissile material
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<p>In <a href="/facts/Nuclear_engineering/wu26D25C">nuclear engineering</a>, fissile material is material that can undergo <a href="/facts/Nuclear_fission/LfkIylvm">nuclear fission</a> when struck by a <a href="/facts/Neutron/oRCM1geb">neutron</a> of low energy. A self-sustaining thermal <a href="/facts/Nuclear_chain_reaction/3l0lHBM4">chain reaction</a> can only be achieved with fissile material. The predominant <a href="/facts/Neutron_temperature/UMKR4XgJ">neutron energy</a> in a system may be typified by either slow neutrons (i.e., a thermal system) or fast neutrons. Fissile material can be used to fuel <a href="/facts/Thermal-neutron_reactor/tQQ71GtJ">thermal-neutron reactors</a>, <a href="/facts/Fast-neutron_reactor/g5kt2e6R">fast-neutron reactors</a> and <a href="/facts/Nuclear_explosive/8p48G1Yv">nuclear explosives</a>. </p>