Definition of actinometer in English:

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Pronunciation: /ˌaktəˈnämədər/


An instrument for measuring the intensity of radiation, typically ultraviolet radiation.
Example sentences
  • Second, to measure the number of moles of photons or einsteins absorbed by the actinometer, a calibrated system must be used, which can be either another actinometric solution or a calibrated radiometer, photocell or photodiode.
  • Chemical actinometry using the potassium ferrioxalate actinometer gave an incident intensity 10 of about 2.8 X 10 + 16 quanta-s 1.
  • Porrino et al using an instrument designed at the NIMH called the actinometer found that a 15 mg dose of DAS would produce a decrease in hyperactive motor behavior for 8 hours.


Mid 19th century: from Greek aktis, aktin- 'ray' + -meter.

For editors and proofreaders

Syllabification: ac·ti·nom·e·ter

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