New position-sensitive detector for gamma-ray astronomy in the energy range of 15 keV to 1 MeV

Zhong He; David Ramsden

doi:10.1117/12.161373

19 October 1993 New position-sensitive detector for gamma-ray astronomy in the energy range of 15 keV to 1 MeV

Zhong He, David Ramsden

Proceedings Volume 1948, Astroparticle Physics and Novel Gamma-Ray Telescopes; (1993) https://doi.org/10.1117/12.161373
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

A new position-sensitive gamma-ray detector to cover the energy band from 15 keV to 1 MeV has been investigated. The detector concept is based on the use of an array of discrete 1 X 1 X 5 cm phoswich scintillation bars viewed by position-sensitive photomultiplier tube (PSPMT). The test results show that the energy resolution, about 40% FWHM at 60 keV and 12% FWHM at 511 keV, can be easily obtained when using CsI(Na) crystals. The point- spread function for the location of each event is smaller than the cross section of a single bar over the entire energy range. This means that there is virtually no ambiguity in locating signals from different bars. The outputs from the CsI(Na) and GSO veto crystals can be distinguished by a pulse-shape discriminator designed especially for this system. Those multi- site events which deposit energy only in the CsI(Na) array can be recognized using the position sensing capability of the tube.

Citation Download Citation

Zhong He and David Ramsden "New position-sensitive detector for gamma-ray astronomy in the energy range of 15 keV to 1 MeV", Proc. SPIE 1948, Astroparticle Physics and Novel Gamma-Ray Telescopes, (19 October 1993); https://doi.org/10.1117/12.161373

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