Radionuclide
= Radionuclide
{wiki}
= Radioisotope
{synonym}
= Radioactive isotope
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A radionuclide is a species of <atomic nucleus> with an unstable nuclear state that undergoes <radioactive decay>. A sample's expected surviving population decreases with its <nuclear decay constant>. <Carbon-14> is the <radioisotope> used in <radiocarbon dating>.