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The Adobe Flash Player is required in order to view this content. You can get it here: actinometerOne entry found. Main Entry: ac·ti·nom·e·ter Pronunciation: \ˌak-tə-ˈnä-mə-tər\ Function: noun Date: 1833 : any of various instruments for measuring the intensity of incident radiation; especially : one in which the intensity of radiation is measured by the speed of a photochemical reaction — ac·ti·no·me·tric \-nō-ˈme-trik\ adjective — ac·ti·nom·e·try \-ˈnä-mə-trē\ noun 
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