### Question
How does the law define high-enriched uranium?


### Answer
Under *42 U.S.C. § 16281*, **high-enriched uranium** is defined as:

> uranium with an assay of 20.0 weight percent or more of the uranium-235 isotope

#### Citation:
  - *42 U.S.C. § 16281*
  - Heading: **CHAPTER 149-NATIONAL ENERGY POLICY AND PROGRAMS > SUBCHAPTER IX-RESEARCH AND DEVELOPMENT > Part E-Nuclear Energy**

