X-ray detector calibration at CEA/Bruyères-le-Châtel

At CEA/Bruyères-le-Châtel (Service CEM), there are facilities to calibrate X-ray detectors from 200 eV to 100 keV, with an accuracy of 4% at high energies (E > 3 keV). urce is the direct radiation from the X-ray tubes [CKα (277 eV) to TiKαKβ (4.51/4.93 keV)] or fluorescence emission from secondary targets [MgKα (1.25 keV) to UKα (98 keV)]. In addition, calibrations are carried out with the synchrotron radiation of the Super-ACO storage ring (LURE-Orsay), by selecting the monoenergetic beams with a double crystal monochromator which is tunable between 0.8 and 8 keV. The resolution is better than 1 eV. This last tool is very useful in the study of the absorption edges of the detector compounds (for example, Si K-edge and Ar K-edge). xamples are presented of results obtained between 1 and 50 keV, with special reference to high flux detectors such as gold photocathodes and silicon avalanche photodiodes. Thick silicon photodiodes (for the high energy range) were also calibrated.