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In page Depleted uranium:
"Natural uranium contains about 0.72% 235U. Depleted uranium has lower mass fractions—up to three times less—of 235U and 234U than natural uranium. Since 238U has a much longer half-life than the lighter isotopes, DU is about 40% less radioactive than natural uranium.[1][2][3] Most of the alpha radiation comes from 238U and 234U[4] whereas beta radiation comes from decay products 234Th and 234Pa that are formed within a few weeks.[citation needed]
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