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Proceedings Paper

Hybrid Gas Scintillation Proportional Counteriphoswich Detector For Hard X-Ray Astronomy
Author(s): Jonathan E. Grindlay; Raj P. Manandhar
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Paper Abstract

We present a concept for a balloon-borne imaging hybrid proportional counter/phoswich detector of medium to hard X-rays. The phoswich would be optically coupled to the exit window of the proportional counter, and both detectors would use a common position-sensitive readout. We anticipate that such a detector could combine the good energy and position resolution and excellent background rejection ability of the proportional counter for incident photon energies <100 keV with the extended response of the phoswich for higher energies. The phoswich could also be used to reject Compton scattering events in the proportional counter. We are studying this detector concept using numerical simulations of a 400 cm2 square prototype detector. We use a Monte Carlo approach, properly accounting for range, penetration depth, and diffusion effects in the proportional counter. We explicitly model the propagation of the scintillation light from the proportional counter through a waveshifter and the phoswich, and its detection with an Anger camera arrangement of Hamamatsu crossed-wire anode photomultiplier tubes. Results from this simulation indicate that current levels of proportional counter and phoswich performance are attainable at small cost in quantum efficiency, compared to a bare phoswich detector. We also report some rough calculations of the background rejection efficiency in the xenon and the phoswich.

Paper Details

Date Published: 27 November 1989
PDF: 12 pages
Proc. SPIE 1159, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics, (27 November 1989); doi: 10.1117/12.962589
Show Author Affiliations
Jonathan E. Grindlay, Harvard-Smithsonian Center for Astrophysics (United States)
Raj P. Manandhar, Harvard-Smithsonian Center for Astrophysics (United States)

Published in SPIE Proceedings Vol. 1159:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics
Charles J. Hailey; Oswald H. W. Siegmund, Editor(s)

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