NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,079 terms related to cancer and medicine.
- listen (RAY-dee-oh-I-suh-tope)
- An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment. Also called radionuclide.