Abstract
The characteristics of a conventional cylindrical geometry proportional counter with different anode wire diameters from 12.5 μm to 100 μm were investigated for both pure xenon gas and xenon +5% methane gas mixtures at 1 atm. With pure xenon gas the energy resolution with 12.5 μm to 100 μm anodes were 7.0% and 8.1% for 22 keV X-rays, respectively. From calculations of the Townsend ionization coefficient it is shown that proportional counters with thinner anode wires operate at stronger reduced electric fields than those with thicker anode wires. It is suggested that this is the fundamental reason for the improvement in energy resolution observed as the anode diameter is decreased.
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