Title :
Digital pulse-shape analyzer based on fast sampling of an integrated charge pulse
Author :
Jordanov, Valentin T. ; Knoll, Glenn F.
Author_Institution :
Dept. of Nucl. Eng., Michigan Univ., Ann Arbor, MI, USA
fDate :
30 Oct-5 Nov 1994
Abstract :
A novel configuration for pulse-shape analysis and discrimination has been developed. The current pulse from the detector is sent to a gated integrator and then sampled by a flash analog-to-digital converter (ADC). The sampled data are processed digitally, thus allowing implementation of a near-optimum weighting function and elimination some of the instabilities associated with the gated integrator. The analyzer incorporates pileup rejection circuit that reduces the pileup effects at high counting rates. The system was tested using a liquid scintillator. Figures of merit for neutron-gamma pulse-shape discrimination were found to be: 0.78 for 25 keV (electron equivalent energy) and 3.5 for 500 keV
Keywords :
analogue-digital conversion; detector circuits; digital circuits; discriminators; gamma-ray detection; integrating circuits; liquid scintillation detectors; neutron detection; nuclear electronics; pulse height analysers; sampled data circuits; 25 to 500 keV; digital pulse-shape analyzer; fast sampling; flash analog-to-digital converter; gated integrator; integrated charge pulse; liquid scintillator; near-optimum weighting function; neutron-gamma pulse-shape discrimination; pileup rejection circuit; pulse-shape analysis; Detectors; Digital filters; Finite impulse response filter; Nonlinear filters; Photomultipliers; Pulse shaping methods; Sampling methods; Shape; Signal detection; Signal processing;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Conference_Location :
Norfolk, VA
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474334
