A simple X-ray position detection system based on a MHSP

• Autor(a) principal: Luz, H. Natal da
• Data de Publicação: 2007
• Outros Autores: Veloso, J. F. C. A., Santos, J. M. F. dos, Mir, J. A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/4350; https://doi.org/10.1016/j.nima.2007.06.083
• topic: Micro-Hole and Strip Plate; Gas Electron Multiplier; 2D imaging; Resistive charge division; Analogue divider; X-ray detectors

A simple system for position detection based on a Micro-Hole and Strip Plate (MHSP) using a resistive charge division method was implemented. A thin resistive layer of about 100 [Omega] between each strip (top surface) and between each anode strip (bottom surface) allows us to obtain the actual position in both orthogonal directions. The readout electronics uses only two preamplifiers, a sum and a divider circuit to calculate the interaction point, in each dimension. For a detector filled with 1 atm of pure xenon, position resolutions of less than 300 [mu]m (FWHM) were achieved using 5.9 keV X-rays, for a signal-to-noise ratio (SNR) of 30. For these conditions, a detector gain of about 104 and an energy resolution of about 15% were obtained.