- The use of radioactive isotopes to help prevent, diagnose, and treat diseases. In prevention and diagnosis, for instance, small amounts of short-lived radioisotopes are introduced into the body. Specific organs, bones, and tissues absorb varying amounts, which can enhance techniques utilized for imaging internal body structures. In the treatment of disease, for example, radioisotopes are used to combat cancerous cells.
- noun the use of radioactive substances for detecting and treating disorders