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action spectrum

function representing the relative spectral effectiveness of optical radiation, for a specified actinic effect, in a specified system; also referred to as: actinic spectrum efficiency of equal intensities of monochromatic radiation for producing that phenomenon in that system as a function of wavelength

Equivalent term: "spectral weighting function"

NOTE 1 The normalized action spectrum is the wavelength dependence of the inverse of the dose of monochromatic radiation required to induce a certain (biologic) response; the action spectrum is commonly normalized to a value of 1 at the wavelength of "maximum action", i.e., where the smallest dose suffices to induce the required effect.

NOTE 2 Also referred to as: actinic spectrum.

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