Abstract

A stabilisation of the gas gain for proportional counters with a continuous gas flow is described. New gas-flow systems for two end-window counters and one pressurised proportional counter were developed. The gas density of the counting-gas flow is stabilised by a two-stage back-pressure regulation system. The pressure in the gas flow is compared with the pressure in a reference vessel. During one month of operation the gain was stable within ±0.3%.

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