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

• Autor(es): Luz, H. Natal da ; Veloso, J. F. C. A. ; Santos, J. M. F. dos ; Mir, J. A.
• Data: 2007
• Identificador Persistente: http://hdl.handle.net/10316/4350
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Micro-Hole and Strip Plate; Gas Electron Multiplier; 2D imaging; Resistive charge division; Analogue divider; X-ray detectors
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

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. http://www.sciencedirect.com/science/article/B6TJM-4P47GB7-4/1/4ebeb6377e7ec6cafd17bbb22153b587