A fertile material whose neutron capture produces uranium-239. It can undergo neutron-induced fission at sufficiently high incident neutron energies, while slow-neutron capture can instead initiate breeding of plutonium-239.
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Uranium-238 (U-238) is one of the isotopes of uranium, which is a naturally occurring element found in the Earth's crust. It is the most abundant isotope of uranium, constituting about 99.3% of natural uranium. U-238 is a heavier isotope, with 146 neutrons and 92 protons in its nucleus, giving it an atomic mass of approximately 238 atomic mass units (amu).
