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An instrument for measuring the intensity of radiation, typically ultraviolet radiation.
- ‘Spherical and tubular actinometers containing iodide/iodate solution were suspended from the ceiling at the positions indicated in Fig.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.’
- ‘After the monochromator the light was reimaged onto the actinometer and a silicon photodiode, located behind the cuvette, by a normal-incidence spherical mirror as indicated in Fig.1.’
- ‘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.’
Mid 19th century: from Greek aktis, aktin- ray + -meter.
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