What is meant by enriched uranium?
1.Enriched uranium is an uranium-containing substance in which its natural amount of uranium-235 was increased.
2.Enriched uranium is an uranium-containing substance in which its natural amount of uranium-235 was decreased.
3.Enriched uranium is an uranium-containing substance that includes not only uranium-235 but also uranium-236 and uranium-237.
4 Enriched uranium is a substance that contains uranium-236.