Position Sensitive Proportional Counter for Measurement of Tritium Labelled Gas Movement

Abstract

A position sensitive proportional counter of a charge division type with a single resistive anode wire was constructed for the measurement of the movement of ³H labelled gas which is flowing or diffusing in a pipe. The introduction of resistors between the anode wire and pre-amplifiers brought a uniform detection efficiency for ³Hβ-rays throughout the counter. The position resolution was 3.1 mm FWHM. Detection efficiency was almost 100% uniformly over about 700 mm in the total anode length of 740 mm. The movement of ³H labelled gas could be measured effectively.