A broad-band position-sensitive phoswich detector for gamma-ray astronomy

Details A broad-band position-sensitive phoswich detector for gamma-ray astronomy A broad-band position-sensitive phoswich detector for gamma-ray astronomy

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993nimpa.336..330h&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 336, Issue 1-2, p. 330-335.

Physics

4

Scientific paper

A position-sensitive phoswich detector designed to cover a wide 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 × 1 × 5 cm phoswich scintillation bars, the top 3 cm of which is CsI(Na) whilst the rear 2 cm is a GSO (Cerium-doped Gadolinium Orthosilicate Gd2SiO5(Ce), [1,2]) veto crystal. The array is viewed by a single position-sensitive photomultiplier tube (PSPMT). The test results show that energy resolution ranges from 31% FWHM at 60 keV to 13% FWHM at 511 keV. The FWHM of 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 guarantees good separation between energy deposits in adjacent bars. The outputs from the CsI(Na) main detectors and GSO veto crystals can be distinguished by a simple pulse-shape discriminator (PSD). Those multi-bar events which deposit energy only in the CsI(Na) array can be recognised using the position sensing capability of the tube. When used in conjunction with a coded-mask imaging system, an array of such detector modules could provide a competitive telescope for a future gamma-ray astronomy mission.

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