Characterization of a triple-GEM position sensitive detector for X-ray fluorescence imaging

Abstract

In this work we characterized a X-ray position sensitive gaseous detector based in a triple stack of gas electron multipliers (GEM). The readout circuit is divided in 256 strips for each dimension and using a resistive chain interconnecting the strips, we are able to reconstruct the radiation interaction points by resistive charge division. The detector achieved gains above $10^4$, energy resolution of 15.28% (FWHM) for 5.9keV X-rays, and position resolution of 1.2mm, while operating in Ar/CO${}_2$(90/10) at atmospheric pressure.

10 pages, 12 figures, submitted to the Proceedings of the European Conference on X-Ray Spectrometry (2018)