A uranium isotope that is a principal fissile material in thermal-neutron reactors. Capturing a neutron produces excited uranium-236.
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Uranium-235 (U-235) is one of the isotopes of uranium, a heavy metal that is used as a fuel in nuclear reactors and in the production of nuclear weapons. U-235 is particularly significant because it is fissile, meaning it can sustain a nuclear fission reaction when it absorbs a neutron.
