This paper discusses the process of functional aging of Geiger-Muller counters.Two types of Geiger-Muller counter BI-NEUTRALIZING CONDITIONER chambers were characterized in an experiment using a combined constant voltage.Chamber A had a coaxial geometry and chamber B had a plan-parallel geometry.The experimental results indicate that the aging process was faster in the case of chambers with a coaxial geometry.The results are explained based on Jackets the process of electrical discharges in gasses.