Geiger-Muller Region:
The pulse height within the Geiger-Muller region (Region V) is independent of the category of radiation causing the initial ionizations. A pulse height acquired is on the sequence of various volts. The field strength is so great in that the discharge, once ignited, continues to spread until amplification cannot occur, since of a dense positive ion sheath surrounding the middle wire (anode). V4 is termed the threshold voltage. This is where the number of ion pairs level off and remain associatively independent of the applied voltage. This leveling off is known as the Geiger plateau that extends over a region of 200 to 300 volts. A threshold is generally about 1000 volts. Within the G-M region, the gas amplification factor (A) depends on the specific ionization of the radiation to be detected.