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Title: Investigation about decoupling capacitors of PMT voltage divider effects on neutron-gamma discrimination

Scintillators are almost used in any nuclear laboratory. These detectors combine of scintillation materials, PMT and a voltage divider. Voltage dividers are different in resistive ladder design. But the effect of decoupling capacitors and damping resistors haven’t discussed yet. In this paper at first a good equilibrium circuit designed for PMT, and it was used for investigating about capacitors and resistors in much manner. Results show that decoupling capacitors have great effect on PMT output pulses. In this research, it was tried to investigate the effect of Capacitor’s value and places on PMT voltage divider in Neutron-Gamma discrimination capability. Therefore, the voltage divider circuit for R329-02 Hamamatsu PMT was made and Zero Cross method used for neutron-gamma discrimination. The neutron source was a 20Ci Am-Be. Anode and Dynode pulses and discrimination spectrum were saved. The results showed that the pulse height and discrimination quality change with the value and setting of capacitors.
Authors:
;  [1] ;  [2]
  1. Dep. Of Physics, Faculty of Science, University of Birjand, Birjand (Iran, Islamic Republic of)
  2. Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22390735
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1634; Journal Issue: 1; Conference: TIM-13 Physics Conference, Timisoara (Romania), 21-24 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANODES; CAPACITORS; DAMPING; DECOUPLING; DESIGN; DISCRIMINATORS; ELECTRIC POTENTIAL; GAMMA DETECTION; NEUTRON DETECTION; NEUTRONS; PARTICLE DISCRIMINATION; PHOSPHORS; PHOTOMULTIPLIERS; RESISTORS; SCINTILLATIONS; SOLID SCINTILLATION DETECTORS