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The performance of quenched and non-quenched argon-xenon Penning mixtures in a Gridded-Microstrip Gas Chamber is studied for 5.9 keV X-rays. The best energy resolution obtained was 12.5% for the 95%Ar-5%Xe mixture. Charge multiplication gains one order of magnitude higher than in pure xenon were obtained for 95%Ar-5%Xe. With the addition of the quenching agent (methane), although the gas gain at the same anode voltage decreases, a better energy resolution of 12.3% is achieved for the 85.5%Ar-5%Xe-9.5%CH4 mixture.Index Terms-Argon-xenon and P10-xenon gas mixtures, microstrip plate, Penning mixtures, x-ray gaseous detector.

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