### Question
How is the term highly enriched uranium defined?


### Answer
The term **highly enriched uranium** is defined in *42 U.S.C. § 2142* as the following:

> uranium enriched to 20 percent or more in the isotope U–235

#### Citation:
  - *42 U.S.C. § 2142*
  - Heading: **CHAPTER 23-DEVELOPMENT AND CONTROL OF ATOMIC ENERGY > Division A-Atomic Energy > SUBCHAPTER IX-ATOMIC ENERGY LICENSES**

