Abstract
A new dual-parameter pulse-shape-discrimination circuit for the acquisition of proton-recoil pulses (and elimination of gamma-ray-induced pulses) from fast-neutron spectrometer systems has been built and tested. Except for the detector, its bias supply and preamplifier, the system requires only the dual-amplifier—ADC board described in this paper and a personal computer. The basis for this system is a dual-amplifier—ADC board that utilizes dual-amplifier sections for shaping and amplification, and dual Wilkinson-type, 10-bit ADCs from The Nucleus, Inc., all resident on a 20 cm × 28 cm (8 in. × 11 in.) double-sided, printed circuit board. Digital signals from the two ADCs and the associated coincidence circuit are fed to an IBM PC/XT clone through a triple, 8-bit digital interface board. Data-acquisition software has been written in assembler language to reduce data acquisition time, resulting in a 25% deadtime at 5000 counts per second using the 4 MHz processor of the IBM PC/XT. The system has been tested using both spherical and cylindrical gas-filled proton-recoil detectors and an NE-213 liquid scintillator. Quasi-monoenergetic spectra from filtered neutron beams at 24 keV and a broad energy spectrum from an aluminum/sulfur filter have been measured. In these cases the measured spectra agreed well with expected results, indicating that gamma-ray discrimination has been accurately achieved using the system.
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