nominally labelled tracer
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https://doi.org/10.1351/goldbook.N04178
A tracer in which the label is present mainly in a specified position.
Source:
PAC, 1994,
66
, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2526 (https://doi.org/10.1351/pac199466122513)