Radiometry using synchrotron radiation at PTB

The facilities for radiometry using synchrotron radiation at the Physikalisch-Technische Bundesanstalt are presented and the methods for absolute calibration of radiation sources and detectors are described. Most of the measurements are based on the use of two different types of primary standards, storage rings as primary radiation source standards and cryogenic electrical substitution radiometers as primary detector standards. The facilities allow us to offer radiometric calibrations in the spectral range from the UV to x-rays with relative uncertainties down to 0.4%. (C) 1999 Elsevier Science B.V. All rights reserved.