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Proceedings Paper

Performance of a multistep fluorescence-gated proportional counter for hard x-ray astronomy
Author(s): Kurtis L. Dietz; Brian D. Ramsey; Martin C. Weisskopf
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Paper Abstract

The results from the first flight of our proportional counter in an imaging telescope led us to rebuild the detector in anticipation of a Fall 1992 flight. We have used a Penning gas mixture (xenon + 1% isobutylene) and introduced a preamplification region to improve the energy resolution. We have rebuilt the pressure vessel making novel use of molybdenum as the housing material in order to reduce the residual instrument background, particularly in the fluorescence-gated mode for which the detector design has been optimized. We have also increased the sensitive gas depth from 9 cm to 14 cm to further increase the sensitivity to both fluorescent pairs and conventional singles. Our calibrations have shown that the overall energy resolution of the detector has been enhanced by a factor of 2, and we predict that the sensitivity at float will increase by a factor of 3 in the 50 - 70 keV energy band.

Paper Details

Date Published: 8 October 1992
PDF: 9 pages
Proc. SPIE 1743, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy III, (8 October 1992); doi: 10.1117/12.130685
Show Author Affiliations
Kurtis L. Dietz, NASA/Marshall Space Flight Ctr. (United States)
Brian D. Ramsey, NASA/Marshall Space Flight Ctr. (United States)
Martin C. Weisskopf, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 1743:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy III
Oswald H. W. Siegmund, Editor(s)

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