Title :
The optimization 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
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 have been developed to form the basis of the imager detector plane. The crystal preparation and wrapping, crystal geometry, optical coupling, and matching to the photodiode have all been 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 22% of 122 keV and 7% at 662 keV have been obtained using a 1 cm3 crystal on a 10×10 mm crystal. With standard laboratory electronics, a low energy threshold of~40 keV has been obtained
Keywords :
caesium compounds; gamma-ray detection and measurement; materials preparation; scintillation counters; tellurium; 1 to 6 cm; 122 keV; 40 keV; 662 keV; CsI:Tl; crystal geometry; energy resolution; energy threshold; gamma-ray detectors; optical coupling; preparation; Energy resolution; Gamma ray detection; Gamma ray detectors; Geometrical optics; Laboratories; Optical coupling; Photodiodes; Readout electronics; Solid scintillation detectors; Wrapping;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301130
