Abstract
This paper describes windowless air proportional counters designed to detect low energy β-rays with high sensitivity which are emitted from tritium deposits. When air is used as the filling gas of proportional counters, usually only low efficiency can be obtained for the detection of β-rays, since primary electrons created in air by a β-ray are lost in the main by electron attachment to oxygen molecules in air before they trigger an electron avalanche. To improve this situation multiwire counters are constructed which possess narrow anode-cathode distances of 1–2 mm. The counters were proved to provide high intrinsic efficiency for tritium β-rays and hence will be expected to be used as a detector of the tritium survey meter.
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