uranium with less uranium-235 than natural uranium. Addition to an immobilised plutonium inventory can dilute uranium-235 subsequently formed by plutonium-239 radioactive decay; chemical coexistence is not irreversible protection against deliberate separation.
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Depleted uranium (DU) is uranium that has a lower proportion of the isotope uranium-235 compared to natural uranium. Natural uranium consists of about 0.7% uranium-235 and about 99.3% uranium-238, while depleted uranium typically contains less than 0.3% uranium-235.