Hybrid Gas Scintillation Proportional Counteriphoswich Detector For Hard X-Ray Astronomy

Jonathan E. Grindlay; Raj P. Manandhar

doi:10.1117/12.962589

27 November 1989 Hybrid Gas Scintillation Proportional Counteriphoswich Detector For Hard X-Ray Astronomy

Jonathan E. Grindlay, Raj P. Manandhar

Proceedings Volume 1159, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics; (1989) https://doi.org/10.1117/12.962589
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

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.

Citation Download Citation

Jonathan E. Grindlay and Raj P. Manandhar "Hybrid Gas Scintillation Proportional Counteriphoswich Detector For Hard X-Ray Astronomy", Proc. SPIE 1159, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics, (27 November 1989); https://doi.org/10.1117/12.962589

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