The Prospects of Using Large Vacuum Photodiodes with Gas Scintillation Proportional Counters

Calculations have been made that indicate that large area vacuum photodiodes, particularly with Cs2Te photocathodes, offer great advantages over photomultiplier tubes as the light sensing element in a gas scintillation proportional counter. Expected quantum efficiencies for Cs2Te and CsI photocathodes are calculated for Xe, Kr, and Ar spectra.