Also found in: Thesaurus, Encyclopedia, Wikipedia.


Any of several radiometric instruments, such as a pyrheliometer, used chiefly for meteorological measurements of terrestrial and solar radiation.

ac′ti·no·met′ric (-nō-mĕt′rĭk), ac′ti·no·met′ri·cal adj.
ac′ti·nom′e·try n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(General Physics) an instrument for measuring the intensity of radiation, esp of the sun's rays
actinometric, ˌactinoˈmetrical adj
ˌactiˈnometry n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌæk təˈnɒm ɪ tər)

a device for measuring intensity of radiation, esp. that of the sun.
ac`ti•no•met′ric (-noʊˈmɛ trɪk) adj.
ac`ti•nom′e•try, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.actinometer - an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


n (Met) → Aktinometer nt
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
Parker, "A new sensitive chemical actinometer," Proceedings of Royal Society of London Series A, Mathematical and Physical Sciences, vol.
The incident light intensity, measured with a uranyl actinometer, was 1.38 x [10.sup.-9] Einstein [s.sup.-1].
While chemical actinometers can be used to measure sample dose, selecting a suitable chemical actinometer involves trade-offs.
July 14 'On A Sun-gauge or New Actinometer', Empire, p.
The absolute, total intensity of the LED was measured with the chemical actinometer, potassium ferrioxalate, which is recommended for the 253-577 nm wavelength range.
Due to closeness of Tartu and Toravere, the same radiation sensor (Yanishevsky actinometer AT-50) and unchanged measurement methods used, the data of both stations can be combined in one time series, covering the years 1950-2006.
The ICH-QIB guideline specifies a chemical actinometer for measurement of the exposure dose, which is an ampoule containing a photosensitive solution which converts the absorbed light quantity at a specific rate.
In parallel, broadband direct solar irradiance [S.sub.h] was registered at Toravere every 3 min (an AT-50 actinometer was used as an operational pyrheliometer).
The fraction of light energy absorbed by the reaction mixture was determined with a ferrioxalate actinometer [19].