### Question
How does PROLIFERATION MATTERS define highly-enriched uranium?


### Answer
Under *50 U.S.C. § 2569*, **highly-enriched uranium** is defined as:

> 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**

