Performance characteristics of A150 plastic-equivalent gases in A150 plastic proportional counters for 14.8-MeV neutrons

Two recently developed A150 plastic-equivalent gas mixtures have been tested for suitability in proportional counter applications. Methane- and propane-based ''tissue-equivalent'' gases were also included for comparison purposes. Event-size weighted dose distributions were measured in a 14.8-MeV neutron beam. Resolution was found to be independent of gas mixture. Moreover the gains of the two A150 mixtures were the same, and comparable to that of the methane-based gas mixture. The ionization yield per event size was also independent of the hydrogenous gas mixture employed. Neutron doses determined with the proportional counter were in reasonable agreement with those obtained from an ionization chamber