Element
radioisotope
ra·di·o·nu·clide [ ray-dee-oh-i-suh-tope ]
Subclass of:
Isotopes
Definitions related to radioisotopes:
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An unstable isotope of an element that decays or disintegrates spontaneously, emitting energy (radiation). (NTI)CDISC TerminologyClinical Data Interchange Standards Consortium (CDISC), 2021
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A version of a chemical element that has an unstable nucleus and emits radiation during its decay to a stable form. (online dictionary)NCI ThesaurusU.S. National Cancer Institute, 2021
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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.NCI Dictionary of Cancer TermsU.S. National Cancer Institute, 2021
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(radionuclide) Isotopes that decay and emit radiation; either naturally occurring elements or are produced by the action of neutrons, protons, deuterons, or alpha particles; index with a specific element when appropriate, e.g., C14 index with CARBON and RADIONUCLIDE.CRISP ThesaurusNational Institutes of Health, 2006
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Isotopes that exhibit radioactivity and undergo radioactive decay. (From Grant & Hackh's Chemical Dictionary, 5th ed & McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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(radionuclides) Short-lived radioactive chemicals that are used in nuclear imaging tests.Harvard Dictionary of Health TermsHarvard Medical Publishing, 2011
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