Charge and light gain measurements in argon-nitrogen mixtures using a gas scintillation proportional counter

This paper describes the measurements of charge and light gain in argon-nitrogen mixtures using a gas scintillation proportional counter. The factors studied here which affect light emission, are anode voltage, nitrogen concentration and anode wire diameter. Results show that around a few percent nitrogen a maximum gain is obtainable. These results are in agreement with those of other workers. It was shown that, for a given charge gain, the light gain is independent of nitrogen concentration above 4% concentration. Thicker wires are suitable for high light output requirements with minimum space charge effects.