Digitalized two parametric system for gamma/neutron spectrometry - Paper 59

Conference · Mon Sep 15 00:00:00 EDT 2014

OSTI ID:23082897

Veskrna, Martin; Matej, Zdenek; Mravec, Filip; Prenosil, Vaclav ^[1]; Cvachovec, Frantisek ^[2]; Kostal, Michal ^[3]

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1. Masaryk University, Botanicka 15, Brno 612 00 (Czech Republic)
2. University of Defence, Kounicova 65, 662 10 Brno (Czech Republic)
3. Research Center Rez ltd., 250 68 Husinec-Rez 130 (Czech Republic)

Many types of detectors like stilbene, NE-213 etc. in conjunction with photomultiplier loaded with low working resistance produce pulses of approximately 100 ns length and contain information about deposited particle in the trailing edge. Using fast analog to digital converters (ADC) and field-programmable gate array (FPGA) it is possible to create a spectrometric system working in mixed gamma and neutron fields which is not loaded dead time. The count rate of processed pulses can reach more than one million per second. Such a high count rate of processed pulses can be achieved due to the pulse processing is implemented in FPGA. The output of this pulse processing is amplitude which describes the energy of deposited particle and discrimination parameter whereby it is possible to discriminate photons and neutrons. To increase the dynamic range of energy of detectable particle the signal from photomultiplier is separated into two branches with different amplification. Each branch is digitalized by separate ADC. Components from which the system is composed are so light that the spectrometer can be easily transported. Its weight is less than 3 kilograms. Spectrometer was tested in the research reactor LR-0 in Rez near Prague (Czech Republic). The measured data was processed using deconvolution into a neutron flux density and compared with nowadays used analog spectrometer and simulation result. Measured neutron spectrum of Cf-252 is included. (authors)

• Research Organization: American Nuclear Society - ANS, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
• OSTI ID: 23082897
• Resource Relation: Conference: RPSD 2014: 18. Topical Meeting of the Radiation Protection and Shielding Division of ANS, Knoxville, TN (United States), 14-18 Sep 2014; Other Information: Country of input: France; 4 refs.; available on CD Rom from American Nuclear Society - ANS, 555 North Kensington Avenue, La Grange Park, IL 60526 (US)
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AMPLIFICATION
AMPLITUDES
ANALOG-TO-DIGITAL CONVERTERS
CALIFORNIUM 252
COUNTING RATES
CZECH REPUBLIC
DEAD TIME
DEPOSITS
FLUX DENSITY
NEUTRON FLUX
NEUTRON SPECTRA
NEUTRON SPECTROSCOPY
NEUTRONS
PARTICLES
PHOTOMULTIPLIERS
RESEARCH REACTORS
SIMULATION
SPECTROMETERS
STILBENE