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Wikipedia definition
1. Attenuation coefficientFor "attenuation coefficient" as it applies to electromagnetic theory and telecommunications see propagation constant. For the "mass attenuation coefficient", see the article mass attenuation coefficient. The attenuation coefficient is a quantity that characterizes how easily a material or medium can be penetrated by a beam of light, sound, particles, or other energy or matter.
Read “Attenuation coefficient” on English Wikipedia
Read “吸収係数” on Japanese Wikipedia
Read “Attenuation coefficient” on DBpedia

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