VNIIOFI SECONDARY-STANDARD SOURCES AND DETECTORS OF VACUUM-ULTRAVIOLET AND ULTRAVIOLET-RADIATION

The stability and reproducibility of secondary-standard sources and de tectors are the main problems and the fundamental trouble of spectrora diometry in the ultraviolet spectral range. The high accuracy of the s pectroradiometric unit for primary standards based on synchrotron radi ation sources is lost by transferring that unit to unstable or irrepro ducible secondary standards. The best secondary-standard sources and d etectors for units of spectral radiance, irradiance, radiant power and flux for the wavelength range 30 nm to 400 nm are described. Integral radiometers for different applications are presented.