Abstract
The probability, θ, of a spurious pulse of pulses following a genuine pulse initiated by a single electron has been measured at 720 and 60 torr for the following counter gases: methane, propane, ethylene, tissue equivalent gas and a mixture of 90% argon and 10% methane. The measured values of θ varied considerably from gas to gas and were, in general, smaller for the lower operating pressure. At the voltage required to detect single electrons very large values were observed for θ for radiations from Fe-55 and Am-241. It was also noted that, even in circumstances in which θ is much less than unity, there is a significant probability that some pulses will produce more than one spurious pulse.
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