An instrument for measuring the intensity of radiation, especially ultraviolet radiation.
'Chemical actinometry using the potassium ferrioxalate actinometer gave an incident intensity 10 of about 2.8 X 10 + 16 quanta-s 1.'
'Spherical and tubular actinometers containing iodide/iodate solution were suspended from the ceiling at the positions indicated in Fig.1.'
((n.) An instrument for measuring the direct heating power
of the sun's rays.|--|(n.) An instrument for measuring the actinic effect of rays
of light.|--|)
Origin:
Mid 19th century: from Greek aktis, aktin- ‘ray’ + -meter.
