actinometer

[ak-tuh-nom-i-ter]
noun
a device for measuring intensity of radiation, especially that of the sun.
Compare actinograph.


Origin:
1825–35; actino- + -meter

actinometric [ak-tin-oh-me-trik, ak-tuh-noh-] , actinometrical, adjective
actinometry, noun
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Collins
World English Dictionary
actinometer (ˌæktɪˈnɒmɪtə)
 
n
an instrument for measuring the intensity of radiation, esp of the sun's rays
 
actinometric
 
adj
 
actino'metrical
 
adj
 
acti'nometry
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
actinometer   (āk'tə-nŏm'ĭ-tər)  Pronunciation Key 
Any of several instruments used to measure radiation, such as a pyrheliometer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

actinometer

in chemistry, a substance or a mixture of substances that reacts through the action of light and that, because of the easily determined quantitative relationship between the extent of the reaction and the energy of the absorbed light, is used as a standard for measurement of light energies involved in photochemical work

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The actinometer should be used in an area free of shadows, and with a non-reflecting background.
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