actinometer
noun
ac·ti·nom·e·ter
ˌak-tə-ˈnä-mə-tər 
: 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
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More advanced systems can have all that, plus all or a selection of these: a rain gauge, an anemometer for measuring wind speed and direction, a barometer, and an actinometer for checking UV index and solar radiation.
—
Adrienne Donica, Popular Mechanics, 4 Jan. 2021
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Adrienne Donica, Popular Mechanics, 4 Jan. 2021
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“Actinometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/actinometer. Accessed 31 Oct. 2025.
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actinometer
noun
ac·ti·nom·e·ter
ˌak-tə-ˈnäm-ət-ər
: 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
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