Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2808..158j&link_type=abstract
Proc. SPIE Vol. 2808, p. 158-169, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII, Oswald H. Siegmund; Mark A. Gummi
Astronomy and Astrophysics
Astronomy
1
Scientific paper
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.
Bautz Mark W.
Jones Stephen E.
Kissel Steven E.
Pivovaroff Michael
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