Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-05-06
Nucl.Instrum.Meth.A594:79-89,2008
Physics
Nuclear Physics
Nuclear Experiment
26 pages, 14 figures, submitted to Nuclear Instruments and Methods in Physics Research A
Scientific paper
10.1016/j.nima.2008.06.004
Discrimination of the detection of fast neutrons and gamma rays in a liquid scintillator detector has been investigated using digital pulse-processing techniques. An experimental setup with a 252Cf source, a BC-501 liquid scintillator detector, and a BaF2 detector was used to collect waveforms with a 100 Ms/s, 14 bit sampling ADC. Three identical ADC's were combined to increase the sampling frequency to 300 Ms/s. Four different digital pulse-shape analysis algorithms were developed and compared to each other and to data obtained with an analogue neutron-gamma discrimination unit. Two of the digital algorithms were based on the charge comparison method, while the analogue unit and the other two digital algorithms were based on the zero-crossover method. Two different figure-of-merit parameters, which quantify the neutron-gamma discrimination properties, were evaluated for all four digital algorithms and for the analogue data set. All of the digital algorithms gave similar or better figure-of-merit values than what was obtained with the analogue setup. A detailed study of the discrimination properties as a function of sampling frequency and bit resolution of the ADC was performed. It was shown that a sampling ADC with a bit resolution of 12 bits and a sampling frequency of 100 Ms/s is adequate for achieving an optimal neutron-gamma discrimination for pulses having a dynamic range for deposited neutron energies of 0.3-12 MeV. An investigation of the influence of the sampling frequency on the time resolution was made. A FWHM of 1.7 ns was obtained at 100 Ms/s.
Nyberg Johan
Söderström Pär-Anders
Wolters R.
No associations
LandOfFree
Digital pulse-shape discrimination of fast neutrons and gamma rays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Digital pulse-shape discrimination of fast neutrons and gamma rays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital pulse-shape discrimination of fast neutrons and gamma rays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-209016