Share this entry

actinometer Line breaks: ac¦tin|om¦eter
Pronunciation: /ˌaktɪˈnɒmɪtə/

Definition of actinometer in English:


An instrument for measuring the intensity of radiation, especially 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.

Definition of actinometer in:

Share this entry


What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day confidant
Pronunciation: ˈkɒnfɪdant
a person with whom one shares a secret...