High-pressure operation of a xenon-GPSC/MSGC hybrid detector for hard X-ray spe...

• Autor(es): Coelho, L. C. C. ; Veloso, J. F. C. A. ; Covita, D. S. ; Ferreira, L. F. Requicha ; Santos, J. M. F. dos
• Data: 2006
• Identificador Persistente: http://hdl.handle.net/10316/4389
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Gas scintillation; High pressure; Csl photocathode; Gamma-rays
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

The performance of a high-pressure xenon gas proportional scintillation counter/microstrip gas chamber (GPSC/MSGC) hybrid detector has been investigated for filling pressures from 1 up to 10 bar, for 22-, 30- and 60-keV photons. GPSC/MSGC hybrid detectors are based on a xenon-GPSC instrumented with a CsI-coated microstrip plate photosensor placed directly within the xenon envelope, as a substitute for the photomultiplier tube. This design avoids the constraints due to the use of a quartz scintillation window for GPSC-photosensor coupling, which absorbs a significant amount of scintillation and is a drawback for applications where large detection areas and high filling pressures are needed. The lowest energy resolutions are achieved for 2 bar (5.5% and 3.4%, FWHM, for 22- and 60-keV photons, respectively). Increasing the pressure to the 5-6 bar range, competitive energy resolutions of 7% and 4.5% are still achieved for 22- and 60-keV photons, respectively. This detector could be a compelling alternative in applications where compactness, large detection area, insensitivity to strong magnetic fields, room temperature operation, large signal-to-noise ratio and good energy resolution are important requirements. http://www.sciencedirect.com/science/article/B6TJM-4M3B6DG-8/1/04ba8b77386c4c69025c7ca19342f792