Abstract
The present paper shows that it is possible to use pure H 2S as filling gas for an internal-gas radioactivity-counter. H 2S used as counting-gas is self-quenching, but spurious after-pulses occur. Therefore a self-closing gate triggered by the primary pulse and closed for several msec must be introduced in order to produce satisfying plateaux in the counting characteristics. The results obtained with two different types of counting tubes and with H 2S pressures between 100 and 450 mbar are reported. Some possible processes taking place in the counting tubes are discussed.
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