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