Lead Oxide Glass Tubing Converters for Gamma Detection in MWPC

PbO glass converters for the detection of gamma rays with MWPC have been investigated. The converters were made by fusing glass tubes stacked to form a close-packed array and were treated in a H2 reduction process to provide a suitable electric drift field. Electron conversion efficiency, drift velocity, and spatial resolution of these arrays were investigated. Using 511 keV gamma rays, an electron conversion efficiency of 8% was established for the converter of 80% PbO by weight (1.4 mm inner diameter, 0.1 mm wall thickness and 2 cm thick).