A curved-grid gas proportional scintillation counter instrumented with a 25-mm active-diameter photosensor

• Main Author: Monteiro, C. M. B.
• Publication Date: 2004
• Other Authors: Morgado, R. E., Santos, J. M. F. dos, Conde, C. A. N.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: https://hdl.handle.net/10316/4449; https://doi.org/10.1016/j.nima.2003.11.416
• topic: Gas scintillation counter; Xenon gas detector; X-ray detector

The curved-grid technique provides a simple method to compensate for the variation in solid angle viewed by the PMT in large-area gas proportional scintillation counters (GPSC), improving their performance. The scintillation region is delimited by a planar grid and a curved one, whose shape is calculated to produce a radially increasing scintillation yield, compensating for the decrease in the solid angle. In this work, we applied this technique to a GPSC instrumented with a PMT having a 25-mm diameter photocathode. The maximum ratio of the detector entrance window to the photocathode diameter thus far achieved, without significant performance degradation, is 1.