radiotracer
/ˈreɪdioʊˌtreɪsər/
noun
- A small amount of a radioactive substance used in medicine or research to track the movement of chemicals or cells in the body or in a system.
- Doctors used a radiotracer to see how the patient's kidneys were working.
- The scientist injected a radiotracer into the plant to study how it absorbed nutrients.
- A radiotracer can help detect tumors by showing where cells are growing too fast.