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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: Radioisótopo

Radioisotope (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.



 
 
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.