Total Gas Pressure Dependence on operation time for Self-Quenching Geiger-Mueller Counters

In this research, we have derived an analytical equation gives dependency of the total gas pressure to operation time for halogen self-quenched GM counter tubes and organic vapor or gas selfquenched GM counter tubes. This equation indicates that the gas pressure exponentially decreases as the operation time increases, at constant temperature of tube and constant activity that this tube exposed to.