Tritium Monitor Based on Gas-flow Proportional Counter

The tritium surface contamination monitor based on gas-flow proportional counter is introduced in this paper. The detector is very advantageous for detecting low energy beta particles. Its detection efficiency is 84%, higher than the similar type monitors. Besides, Plateau Length is longer than 300V, Plateau slope is less than 1%/100V, Lowest Detection Limit is 0.221 Bq/cm2, the relative expansion uncertainty is 0.56%/h. The capabilities are superiority and steadiness. As a result, it can be well used to monitor tritium contamination in working sites or other places, with great value for usage and wide application fields.