radioisotope
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https://doi.org/10.1351/goldbook.R05108
A radioactive isotope of a specified element.
Source:
PAC, 1994,
66
, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2524 (https://doi.org/10.1351/pac199466122513)