conjugation labelling

in radioanalytical chemistry
https://doi.org/10.1351/goldbook.C01271
@L03425@ of a substance by @C01267@ with a labelled molecule.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2521 [Terms] [Paper]