comparator

in radioanalytical chemistry
https://doi.org/10.1351/goldbook.C01194
A known amount of element that is simultaneously irradiated with the @T06284@ in the context of @A00096@. If one comparator is used (single comparator method), it is essentially identical to a flux monitor (expect that this term is not necessarily linked to @A00093@ analysis).
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2516 [Terms] [Paper]