### Question
How does the law define highly enriched uranium?


### Answer
Under *42 U.S.C. § 2297*, **highly enriched uranium** is defined as:

> uranium enriched to 20 percent or more of the uranium-235 isotope

#### Citation:
  - *42 U.S.C. § 2297*
  - Heading: **CHAPTER 23-DEVELOPMENT AND CONTROL OF ATOMIC ENERGY > Division B-United States Enrichment Corporation > SUBCHAPTER I-GENERAL PROVISIONS**

