Title :
The optimisation of small CsI(Tl) gamma-ray detectors
Author :
Bird, A.J. ; Carter, T. ; Dean, A.J. ; Ramsden, D. ; Swinyard, B.M.
Author_Institution :
Dept. of Phys., Southampton Univ., UK
fDate :
8/1/1993 12:00:00 AM
Abstract :
As part of the INTEGRAL (International Gamma-Ray Astrophysical Laboratory) project, CsI(Tl) scintillation elements with a cross-sectional area of 1 cm2 and between 1 and 6 cm in length were developed to form the basis of the image detector plane. The crystal preparation and wrapping, crystal geometry, optical coupling, and matching to the photodiode were optimized in order to maximize the light output from the crystal, and hence produce the lowest energy threshold and best spectral resolution for any given readout electronics. Energy resolutions of 18% at 122 keV and 5.5% at 662 keV were obtained using a 1-cm3 crystal on a 10-mm×10-mm photodiode. With standard laboratory electronics, a low energy threshold of ~35 keV was obtained
Keywords :
gamma-ray apparatus; gamma-ray detection and measurement; scintillation counters; 1 to 6 cm; 122 keV; 35 keV; 662 keV; CsI(Tl) gamma-ray detectors; CsI:Tl; INTEGRAL project; crystal geometry; energy threshold; light output; low energy threshold; optical coupling; preparation; spectral resolution; wrapping; Energy resolution; Gamma ray detection; Gamma ray detectors; Geometrical optics; Laboratories; Optical coupling; Photodiodes; Readout electronics; Solid scintillation detectors; Wrapping;
Journal_Title :
Nuclear Science, IEEE Transactions on
