Design Performance of an High Pressure Parallel Grids Position Sensitive Gas Scintillation Proportional Counter

We present design performance on an high pressure parallel grids position sensitive Gas Scintillation Proportional Counters (HPGSPC). The detector has an usefull geometric area of 450 cm2, an energy resolution better than 4% at 60 KeV, a spatial resolution in the millimiters range from 3 to 120 KeV.