linearity of responsivity

of a radiation detector
https://doi.org/10.1351/goldbook.L03553
The extent to which the output of the
detector
is directly proportional to the incident
radiant power
at a given
wavelength
and at constant
irradiation
geometry.
Source:
PAC, 1995, 67, 1745. (Nomenclature, symbols, units and their usage in spectrochemical analysis-XI. Detection of radiation (IUPAC Recommendations 1995)) on page 1750 [Terms] [Paper]