Abstract
A new procedure for the calibration of photon detectors is presented, based on the electron storage ring BESSY as a calculable radiometric standard source and an energy dispersive Si(Li) detector. The quantum detection efficiency of the Si(Li) detector is determined in the undispersed synchrotron radiation of BESSY, and the detector to be calibrated is compared to the Si(Li) detector in monochromatic radiation. The procedure is applied in the photon energy range from 800 to 3500 eV to calibrate semiconductor photodiodes which are promising as transfer standard detectors due to their high quantum efficiency, excellent stability in intense radiation, and insensitiveness to surface contaminations.
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