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Fissile Uranium:

These isotopes can be split by low to zero energy neutrons in a self-sustaining chain-reaction to release enormous amounts of energy. Natural uranium consists of only 0.711 % U-235, 99.28305 % U-238, and 0.0054 % U-234. U-235 is so fissionable with slow neutrons that a self-sustaining fission chain-reaction can be made to occur in a reactor constructed from natural uranium and a graphite moderator. Standard nuclear reactors use uranium that has been enriched to 3 or 4 % U-235.

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