Quantum efficiency calibration of AXAF CCDs from 2 to 10 keV

Details Quantum efficiency calibration of AXAF CCDs from 2 to 10 keV Quantum efficiency calibration of AXAF CCDs from 2 to 10 keV

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2808...23m&link_type=abstract

Proc. SPIE Vol. 2808, p. 23-33, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII, Oswald H. Siegmund; Mark A. Gummin;

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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 ((superscript 55)Fe) 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.

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