Depleted uranium (DU; also referred to in the past as Q-metal, depletalloy or D-38) is uranium with a lower content of the fissile isotope 235U than natural uranium. Natural uranium contains about 0.72% 235U, while the DU used by the U.S. Department of Defense contains 0.3% 235U or less. The less radioactive and non-fissile 238U constitutes the main component of depleted uranium. Uses of DU take advantage of its very high density of 19.1 grams per cubic centimetre (0.69 lb/cu in) (68.4% denser than lead).
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