Radiometry using synchrotron radiation at PTB

The facilities for radiometry using synchrotron radiation at the Physikalis ch-Technische Bundesanstalt are presented and the methods for absolute cali bration of radiation sources and detectors are described. Most of the measu rements are based on the use of two different types of primary standards, s torage rings as primary radiation source standards and cryogenic electrical substitution radiometers as primary detector standards. The facilities all ow us to offer radiometric calibrations in the spectral range from the UV t o x-rays with relative uncertainties down to 0.4%. (C) 1999 Elsevier Scienc e B.V. All rights reserved.