A radiometer for measuring the total effective UV radiance of the type comprising, in an optical pathway sequence, a diffuser, an interference filter and a detector. Said interference filter comprises a plurality of alternating layers of magnesium fluoride and zirconium oxide, where the dif- fuser/interference filter/detector system has a spectral response equivalent to the erythema action curve CIE.
A RADIOMETER WITH SPECTRAL RESPONSE EQUIVALENT TO THE ERYTHEMA ACTION CURVE CIE, FOR MEASURING THE TOTAL EFFECTIVE IRRADIANCE