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Discrimination of the detection of fast neutrons and gamma rays in a liquidscintillator detector has been investigated using digital pulse-processingtechniques. An experimental setup with a 252Cf source, a BC-501 liquidscintillator detector, and a BaF2 detector was used to collect waveforms with a100 Ms/s, 14 bit sampling ADC. Three identical ADC's were combined to increasethe sampling frequency to 300 Ms/s. Four different digital pulse-shape analysisalgorithms were developed and compared to each other and to data obtained withan analogue neutron-gamma discrimination unit. Two of the digital algorithmswere based on the charge comparison method, while the analogue unit and theother two digital algorithms were based on the zero-crossover method. Twodifferent figure-of-merit parameters, which quantify the neutron-gammadiscrimination properties, were evaluated for all four digital algorithms andfor the analogue data set. All of the digital algorithms gave similar or betterfigure-of-merit values than what was obtained with the analogue setup. Adetailed study of the discrimination properties as a function of samplingfrequency and bit resolution of the ADC was performed. It was shown that asampling ADC with a bit resolution of 12 bits and a sampling frequency of 100Ms/s is adequate for achieving an optimal neutron-gamma discrimination forpulses having a dynamic range for deposited neutron energies of 0.3-12 MeV. Aninvestigation of the influence of the sampling frequency on the time resolutionwas made. A FWHM of 1.7 ns was obtained at 100 Ms/s.

Digital pulse-shape discrimination of fast neutrons and gamma rays