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Radioisotope
Pronunciation
Definition 1
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. (NCI Dictionary)
Definition 2
A version of a chemical element that has an unstable nucleus and emits radiation during its decay to a stable form. (online dictionary) (NCI Thesaurus)
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