Abstract
Perfect noise pulse rejection is essential for the reliable detection of low-level neutrons using 3He proportional counters. Inevitable noise pulses are due to external noises, which could completely be discriminated increasing the height of signal pulses to be larger than the maximum noise pulse height by increasing the gas gain of the counters.Usual detection criterion based on the Gaussian statistics cannot be applied to ultra lowlevel counting where background counts are less than about 20. Another detection criterion based on the Piosson statistics is proposed, which coincides with the former in the extreme of large background counts. The proposed criterion is effectively applicable to the detection of burst neutron emission from “cold nuclear fusion”.
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