Plutonium measurements with a fast-neutron multiplicity counter for nuclear safeguards applications

2014 ◽  
Vol 763 ◽  
pp. 565-574 ◽  
Author(s):  
Jennifer L. Dolan ◽  
Marek Flaska ◽  
Alexis Poitrasson-Riviere ◽  
Andreas Enqvist ◽  
Paolo Peerani ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Neutron Multiplicity ◽  
Nuclear Safeguards

Application research on neutron-gamma discrimination based on BC501A liquid scintillator

Kerntechnik ◽  
2021 ◽  
Vol 86 (6) ◽  
pp. 437-444
Author(s):  
J. Luo ◽  
S. Hou
Keyword(s):  
Fast Neutron ◽  
Figure Of Merit ◽  
Gamma Ray ◽  
Liquid Scintillator ◽  
Comparison Method ◽  
Mean Value ◽  
Neutron Multiplicity ◽  
Nuclear Disarmament ◽  
Zero Crossing ◽  
Non Destructive

Abstract Liquid organic scintillators are widely used in non-destructive analysis, which plays an important role in nuclear disarmament verification. This paper focused on studying the neutron-gamma discrimination technology in the fast neutron multiplicity measuring counter based on BC501A liquid scintillation detector. First, the charge comparison method, the zero-crossing time method and the rise time method were compared via the Geant4 and Matlab algorithm, and the result shows that charge comparison has the highest Figure of Merit. Then, a neutron-gamma discrimination system based on the six-probe fast neutron multiplicity counter was built and tested with a conclusion that the mean value of Figure of merit is 1.08, which verify the satisfactory neutron-gamma discriminating capability of the system. Finally, for the uranium samples, the mass are detected by fast neutron multiplicity counter, and the enrichment are measured by the characteristic gamma-ray signals using the system. The experimental results are in good agreement with the actual data.

scholarly journals Statistical estimation of the performance of a fast-neutron multiplicity system for nuclear material accountancy

2015 ◽  
Vol 784 ◽  
pp. 448-454 ◽  
Author(s):  
David L. Chichester ◽  
Scott J. Thompson ◽  
Mathew T. Kinlaw ◽  
James T. Johnson ◽  
Jennifer L. Dolan ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Statistical Estimation ◽  
Nuclear Material ◽  
Neutron Multiplicity

scholarly journals MPACT Fast Neutron Multiplicity System Design Concepts

2012 ◽  
Author(s):  
D. L. Chichester ◽  
S. A. Pozzi ◽  
J. L. Dolan ◽  
M. T. Kinlaw ◽  
A. C. Kaplan ◽  
...  
Keyword(s):  
System Design ◽  
Fast Neutron ◽  
Neutron Multiplicity ◽  
Design Concepts

Nuclear Material Measurement Based on Fast Neutron Multiplicity Counter

2020 ◽  
Author(s):  
Xianghua Su ◽  
Quanhu Zhang ◽  
Suxia Hou ◽  
Sufen Li ◽  
Jianqing Yang ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Detection Efficiency ◽  
Mass Range ◽  
Nuclear Material ◽  
Neutron Multiplicity ◽  
Analytical Equation ◽  
Analysis Method ◽  
Sample Mass ◽  
Mechanism Of Interaction ◽  
Non Destructive

Abstract Fast neutron multiplicity counting (FNMC) analysis method, as a new non-destructive analysis method for nuclear materials, plays an increasingly important role in the measurement of nuclear material properties. Based on the derivation of the FNMC analytical equation of Pu material, the method of solving the sample parameters was given. By analyzing the mechanism of interaction of neutrons and matter, the model used by Geant4 (version 10.4) software was determined, and a set of three-layer, fast neutron multiplicity counters with six liquid scintillation detectors per layer was constructed. Using the fast neutron multiplicity counter to analyze the measured parameters, the detection efficiency variation was less than 0.4% within the 150g sample mass range, and the PuO2 fluctuation was less than the metal Pu. By studying the detection efficiency and the multiplicity counting rate as a function of sample mass, within the 150g sample mass range, both basically meet the model assumptions of the FNMC analytical equation. The metal Pu and PuO2 samples were set separately, and the FNMC analysis equation was solved. When the sample mass was within 150g, the sample mass solution deviation was less than 10%. The results show that the built-in fast neutron multiplicity counter can better measure Pu sample properties.

Fast-neutron multiplicity analysis based on liquid scintillation

2016 ◽  
Vol 110 ◽  
pp. 53-58 ◽  
Author(s):  
Sufen Li ◽  
Suizheng Qiu ◽  
Quanhu Zhang ◽  
Yonggang Huo ◽  
Hongtao Lin
Keyword(s):  
Fast Neutron ◽  
Liquid Scintillation ◽  
Neutron Multiplicity

scholarly journals MPACT Fast Neutron Multiplicity System Prototype Development

2013 ◽  
Author(s):  
D.L. Chichester ◽  
S.A. Pozzi ◽  
J.L. Dolan ◽  
M.T. Kinlaw ◽  
S.J. Thompson ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Neutron Multiplicity ◽  
Prototype Development ◽  
System Prototype

scholarly journals A study of possibility to design a fast neutron spectrometer based on the organic scintillator with surrounding materials

2014 ◽  
Vol 29 (1) ◽  
pp. 1-9
Author(s):  
Senada Avdic ◽  
Predrag Marinkovic ◽  
Alma Osmanovic ◽  
Izet Gazdic ◽  
Sejla Hadzic ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Neutron Energy ◽  
Pulse Height ◽  
Simulated Data ◽  
Nuclear Safeguards ◽  
Numerical Code ◽  
Fast Neutrons ◽  
Neutron Spectrometer ◽  
Neutron Sources ◽  
Organic Scintillator

This paper deals with the design of a novel spectrometer of fast neutrons in nuclear safeguards applications based on the liquid organic scintillator EJ-309 with materials of different thickness surrounding the detector. The investigation was performed on the simulated data obtained by the MCNPX-PoliMi numerical code based on the Monte Carlo method. Among the various materials (polyethylene, iron, aluminum, and graphite) investigated as layers around the scintillator, polyethylene and iron have shown the most promising characteristics for evaluation of fast neutron energy spectra. The simulated pulse height distributions were summed up for each energy bin in the neutron energy range between 1 MeV and 15 MeV in order to obtain better counting statistics. The unfolded results for monoenergetic neutron sources obtained by a first order of Tikhonov regularization and non-linear neural network show very good agreement with the reference data while the evaluated spectra of neutron sources continuous in energy follow the trend of the reference spectra. The possible advantages of a novel spectrometer include a less number of input data for processing and a less sensitivity to the noise compared to the scintillation detector without surrounding materials.

High order fast neutron multiplicity measurement equations based on liquid scintillation detector

2019 ◽  
Vol 152 ◽  
pp. 45-51 ◽  
Author(s):  
Quanhu Zhang ◽  
Jianqing Yang ◽  
Xinshe Li ◽  
Sufen Li ◽  
Suxia Hou ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Scintillation Detector ◽  
Liquid Scintillation ◽  
High Order ◽  
Neutron Multiplicity ◽  
Measurement Equations ◽  
Liquid Scintillation Detector
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