Depleted Uranium and the IAEA15.2% 4. Is DU more or less radioactive than natural uranium? DU is considerably less radioactive than natural uranium because not only does it have less U-234 and U-235 per unit mass than does natural uranium, but in addition, essentially all traces of decay products beyond U-234 and Th-231 have been removed during extraction and chemical processing of the uranium prior to enrichment. The specifi
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