Radiation Stability of Counting Gas Mixtures Containing CF4

7 Neutron Detectors

“…An anti-coincidence circuit discriminates signals coming simultaneously from more than one anode. The gas mixture, 20% CF 4 and 80% Ar, was resistant to gamma radiation but degradation occurred [29] at neutron fluences of 10 15 n/cm 2 .…”

Operation of {sup 3}He Proportional Chambers in High Gamma Radiation Fields

“…In proportional counters, quench gases are typically added to the primary gas to suppress photon-induced events and to increase the electron drift velocity in the gas [1,2]. Increasing the electron drift velocity reduces pulse rise time to allow the chamber to operate at higher count rates.…”