Basic characteristics of hollow-filament polyimide membrane in gas separation and application to tritium monitors

The separation efficiency of hollow-filament polyimide membranes for 3H and 41Ar is preliminarily examined for a potential application to continuous gas monitoring systems for analysis of stack emission from accelerator facilities. The basic gas separation characteristics of the membranes are experimentally investigated, and a preliminary gas monitor design is proposed. The results indicate that the membranes are capable of selectively enriching hydrogen by more than 25 times, with negligible variation with respect to the species of isotope.