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Proceedings Paper

Hybrid gas detector/phoswich for hard x-ray astronomy
Author(s): Brian D. Ramsey; Robert A. Austin; Takahisa Minamitani; Martin C. Weisskopf; Jonathan E. Grindlay; Kenneth S. K. Lum; Raj P. Manandhar
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Paper Abstract

A hybrid detector, which combines an optical avalanche chamber with a phoswich, is currently under development. The optical avalanche chamber--a proportional counter designed to give large quantities of light photons during charge multiplication, mounts on the front of the scintillator and gives response at low energies, while the solid scintillator takes over at energies where the gas becomes transparent (> 90 keV). Both sections of the hybrid will be read out by a common set of photomultipliers under the phoswich. The addition of the gas section to the phoswich improves the energy resolution of the instrument by a factor of 2.5 at 25 keV and the spatial resolution by a factor of 10 at the same energy. The net result is an instrument with broad band coverage and high sensitivity which will be used for coded aperture imaging on long duration balloon flights.

Paper Details

Date Published: 19 November 1993
PDF: 7 pages
Proc. SPIE 2006, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV, (19 November 1993); doi: 10.1117/12.162821
Show Author Affiliations
Brian D. Ramsey, NASA Marshall Space Flight Ctr. (United States)
Robert A. Austin, NASA Marshall Space Flight Ctr. (United States)
Takahisa Minamitani, NASA Marshall Space Flight Ctr. (Japan)
Martin C. Weisskopf, NASA Marshall Space Flight Ctr. (United States)
Jonathan E. Grindlay, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Kenneth S. K. Lum, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Raj P. Manandhar, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 2006:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV
Oswald H. W. Siegmund, Editor(s)

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