2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85172We investigate the gas gain behaviour of a triple-GEM configuration in gas mixtures of argon, krypton and xenon with ten and thirty percent of carbon dioxide at pressures between 1 and 3 bar. Since the signal widths affect the dead time behaviour of the detector we present signal length measurements to evaluate the use of the triple-GEM in time-resolved X-ray imaging.19 pages, 21 figures, revised version, accepted for publication in Nucl. Instr. and Meth. AInstrumentation and Detectorstext