31 October 1996 Using tritium and x-ray tubes as x-ray calibration sources for the AXAF CCD Imaging Spectrometer
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Abstract
Accurate quantum efficiency calibrations for CCDs require stable sources of known x-ray energies. Radioactive sources are the most stable although some stable commercial x-ray tubes are available. However, sealed, stable x-ray tubes include windows which filter low energy x-rays to which our CCDs are sensitive. Therefore we have developed a windowless radioactive source using the beta spectrum from tritium to fluoresce low-energy x-rays from low Z targets. The potential drawback of tritium outgassing is also investigated. This source is coupled with an additional system based on a stable commercial x-ray tube to produce higher energy x-rays. Together these sources form a system for comparative quantum efficiency measurements with two CCDs mounted on translation stages. We report on the physics and development of these x-ray sources.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stephen E. Jones, Stephen E. Jones, Mark W. Bautz, Mark W. Bautz, Steven E. Kissel, Steven E. Kissel, Michael Pivovaroff, Michael Pivovaroff, } "Using tritium and x-ray tubes as x-ray calibration sources for the AXAF CCD Imaging Spectrometer", Proc. SPIE 2808, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII, (31 October 1996); doi: 10.1117/12.255991; https://doi.org/10.1117/12.255991
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