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31 October 1996 Quantum efficiency calibration of AXAF CCDs from 2 to 10 keV
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We describe methods used to measure the x-ray detection efficiency of reference CCDs for the AXAF CCD imaging spectrometer in the spectral range between 2 keV and 10 keV. The reference CCDs are identical to and are used as calibration transfer standards for the actual flight CCDs. Both radioactive (55Fe) and fluorescent x-ray sources are used to illuminate the CCDs, providing a range of discrete emission lines to cover the energy band. A Si(Li) solid state detector is inserted into the beam to provide absolute calibration from 2 - 10 keV [where the Si(Li) detection efficiency can be calculated from first principles]. The response function of the Si(Li) detector is discussed, along with factors used to obtain CCD efficiency parameters from the raw data. Calibration geometry and typical data are also presented.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Herbert L. Manning, Stephen E. Jones, Steven E. Kissel, Mark W. Bautz, and George R. Ricker Jr. "Quantum efficiency calibration of AXAF CCDs from 2 to 10 keV", Proc. SPIE 2808, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII, (31 October 1996);

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