conjugation labelling

in radioanalytical chemistry
https://doi.org/10.1351/goldbook.C01271
labelling of a substance by conjugation with a labelled molecule.
Source:
PAC, 1994, 66, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2521 (https://doi.org/10.1351/pac199466122513)