Improved resolving time in n-γ coincidence measurements with high pressure 3He ionization chambers

Resolving times in n-γ coincidence measurements with high-pressure, gridded 3He ionization chambers are shown to be reduced from about 5 μs to less than 0.4 μs when grid signals are utilized for timing of neutron events. Compared to that found in the normal case when anode signals are utilized, the coincidence efficiency is reduced to about 70%. Lack of compensation for variable pulse amplitude and rise time is a major factor limiting further improvement in the resolving time. (orig.)