A radionuclide is a nuclide that has excess nuclear energy, making it unstable.
Wikipedia
Atom that has excess nuclear energy, making it unstable
Wikidata
An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation.
OmegaWiki
A radioactive isotope which, when injected into a biological or physical system, can be traced by radiation detection devices, permitting determination of the distribution or location of the substance to which it is attached.
OmegaWiki
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