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


### Answer
The term **highly-enriched uranium** is defined in *50 U.S.C. § 2569* as the following:

> uranium enriched to or above 20 percent in the isotope 235

#### Citation:
  - *50 U.S.C. § 2569*
  - Heading: **CHAPTER 42-ATOMIC ENERGY DEFENSE PROVISIONS > SUBCHAPTER III-PROLIFERATION MATTERS**

