A radionuclide is an atom with an unstable nucleus, which is a nucleus characterized by excess energy which is available to be imparted either to a newly-created radiation particle within the nucleus, or else to an atomic electron. The radionuclide, in this process, undergoes radioactive decay, and emits a gamma ray(s) and/or subatomic particles. These particles constitute ionizing radiation.
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radionuclide A nuclide that exhibits radioactivity.
radionuclide An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation.
