### Question
How is the term fissile materials defined?


### Answer
The term **fissile materials** is defined in *50 U.S.C. § 2569* as the following:

> plutonium, highly-enriched uranium, or other material capable of sustaining an explosive nuclear chain reaction, including irradiated items containing such materials if the radiation field from such items is not sufficient to prevent the theft or misuse of such items

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

