nuclide precursor
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https://doi.org/10.1351/goldbook.08746
Radionuclide which precedes a nuclide in a decay chain.
Source:
PAC, 2021,
93
, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 91 (https://doi.org/10.1515/pac-2019-0302)