radioisotope
/ˌreɪdioʊˈaɪsətoʊp/
noun
- A radioactive form of an element, used in medicine, industry, and scientific research.
- A radioisotope in the smoke detector helps it sense particles in the air.
- The lab ordered a radioisotope of iodine for an experiment.
- Doctors use a radioisotope to scan a patient's thyroid gland.