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action spectrum

   Also found in: Wikipedia 0.02 sec.
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Noun1.action spectrum - the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation
spectrum - an ordered array of the components of an emission or wave


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In addition, large errors can occur due to out-of-band, non-linear, and non-ideal geometric or spatial response of the UV meters, Finally, in many applications, how well the response of the UV meter approximates the presumed action spectrum needs to be understood for optimal use of the meters.
Sources of Error in UV Radiation Measurements by Cromer, Christopher L. / Journal of Research of the National Institute of Standards and Technology
In general, a substance is responsible for an observed chemical process when the action spectrum matches the absorption spectrum.
Unraveling the Mystery of Melanin by WU, CORINNA / Science News
So he and Van der Leun fine-tuned data on UV's skin carcinogenicity -- its action spectrum -- in this mouse to account for the longer path UV rays must traverse through human skin.
Estimating UV's human cancer risk by Science News
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