Background
Natural uranium consists of three isotopes; the majority (99.274 percent) is U-238, while approximately 0.72 percent is U-235 and the remaining 0.0055 percent is U-234. If natural uranium is enriched to contain 3 percent U-235, it can be used as fuel for light water nuclear reactors. If it is enriched to contain 90 percent Uranium-235, it can be used for nuclear weapons.
Read more about this topic: Zippe-type Centrifuge
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