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Proceedings Paper

Correcting x-ray spectra obtained from the AXAF VETA-I mirror calibration for pileup, continuum, background, and deadtime
Author(s): George Chartas; Kathryn A. Flanagan; John P. Hughes; Edwin M. Kellogg; Dan T. Nguyen; Martin V. Zombeck; Marshall K. Joy; Jeffery J. Kolodziejczak
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Paper Abstract

The VETA-I mirror was calibrated with the use of a collimated soft X-ray source produced by electron bombardment of various anode materials. The FWHM, effective area and encircled energy were measured with the use of proportional counters that were scanned with a set of circular apertures. The pulsers from the proportional counters were sent through a multichannel analyzer that produced a pulse height spectrum. In order to characterize the properties of the mirror at different discrete photon energies one desires to extract from the pulse height distribution only those photons that originated from the characteristic line emission of the X-ray target source. We have developed a code that fits a modeled spectrum to the observed X-ray data, extracts the counts that originated from the line emission, and estimates the error in these counts. The function that is fitted to the X-ray spectra includes a Prescott function for the resolution of the detector a second Prescott function for a pileup peak and a X-ray continuum function. The continuum component is determined by calculating the absorption of the target Bremsstrahlung through various filters, correcting for the reflectivity of the mirror and convolving with the detector response.

Paper Details

Date Published: 21 January 1993
PDF: 10 pages
Proc. SPIE 1742, Multilayer and Grazing Incidence X-Ray/EUV Optics for Astronomy and Projection Lithography, (21 January 1993); doi: 10.1117/12.140607
Show Author Affiliations
George Chartas, Smithsonian Astrophysical Observatory (United States)
Kathryn A. Flanagan, Smithsonian Astrophysical Observatory (United States)
John P. Hughes, Smithsonian Astrophysical Observatory (United States)
Edwin M. Kellogg, Smithsonian Astrophysical Observatory (United States)
Dan T. Nguyen, Smithsonian Astrophysical Observatory (United States)
Martin V. Zombeck, Smithsonian Astrophysical Observatory (United States)
Marshall K. Joy, NASA Marshall Space Flight Ctr. (United States)
Jeffery J. Kolodziejczak, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 1742:
Multilayer and Grazing Incidence X-Ray/EUV Optics for Astronomy and Projection Lithography
Richard B. Hoover; Arthur B. C. Walker, Editor(s)

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