Title :
New concepts for the design of large area gas proportional scintillation counters
Author :
Conde, C.A.N. ; dos Santos, J.M.F. ; Bento, A.C.S.S.M.
Author_Institution :
Dept. of Phys., Coimbra Univ., Portugal
Abstract :
New concepts are presented that allow the design of gas proportional scintillation counters with large areas and medium-size photomultipliers. These designs are based on the compensation of the radial decrease of the scintillation light collected in the photomultiplier due to solid angle and reflection effects, with a radial increase of the light production due to a nonuniform electric field produced by a properly shaped curved grid. An implementation of these concepts based on a 2 in.-diameter photomultiplier is presented. It shows a pulse amplitude variation along the radial position (0 to 10 mm) of less than 0.5%, and an energy resolution of 8.0% for a broad 5.9-keV X-ray beam entering the detector through the full 25-mm-diameter window.<>
Keywords :
proportional counters; scintillation counters; 5.9 keV; design; energy resolution; gas proportional scintillation counters; large area; photomultipliers; radial position; reflection; solid angle; Electrons; Energy resolution; Nonuniform electric fields; Optical reflection; Photomultipliers; Production; Scintillation counters; Solid scintillation detectors; X-ray detection; X-ray detectors;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301150
