https://doi.org/10.1351/goldbook.A00087
A chemical system or physical device which determines the number of @[email protected] in a beam integrally or per unit time. This name is commonly applied to devices used in the @[email protected] and @[email protected] @[email protected] ranges. For example, solutions of iron(III) oxalate can be used as a @[email protected], while bolometers, thermopiles, and photodiodes are physical devices giving a @[email protected] that can be correlated to the number of photons detected.
See also:
chemical actinometer