### Question
How is the term radiopharmaceutical defined?


### Answer
The term **radiopharmaceutical** is defined in *42 U.S.C. § 2160d* as the following:

> a radioactive isotope that—


(i) contains byproduct material combined with chemical or biological material

#### Citation:
  - *42 U.S.C. § 2160d*
  - Heading: **CHAPTER 23-DEVELOPMENT AND CONTROL OF ATOMIC ENERGY > Division A-Atomic Energy > SUBCHAPTER X-INTERNATIONAL ACTIVITIES**

