1. uranium free of all impurities
  2. uranium treated with radiation
  3. uranium alloyed with aluminium
  4. uranium with a high percentage of a particular isotope
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Option 4 : uranium with a high percentage of a particular isotope

Enriched uranium is a type of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation. Natural uranium is 99.284% 238U isotope, with 235U only constituting about 0.711% of its mass.
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