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Various measurements were made at the Berlin synchrotron facility, BESSY, on flight-like CCDs. Because the absolute photon flux is very well known at the BESSY facility these measurements provide the opportunity to apply absolute quantum efficiency tests to the ACIS CCDs. Every flight CCD chip was cross calibrated against a CCD with a BESSY calibration in the same chamber and at the same time. Details of the BESSY measurements and analysis of the data are also provided in Chapter 4.