label

https://doi.org/10.1351/goldbook.L03424
A
marker
, tag or indicator distinguishable by the observer but not by the system and used to identify a
tracer
.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2521 [Terms] [Paper]