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Accessible Unlicensed Requires Authentication Published by De Gruyter December 13, 2021

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

Anwendungsforschung zur Neutronen-Gamma-Unterscheidung auf der Grundlage des Flüssigszintillators BC501A
J. Luo and S. Hou
From the journal Kerntechnik


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.


Flüssige organische Szintillatoren werden häufig in der zerstörungsfreien Analyse eingesetzt, die eine wichtige Rolle bei der Überprüfung der nuklearen Abrüstung spielt. In dieser Arbeit wurde die Technologie der Neutronen-Gamma-Diskriminierung in einem schnellen Neutronen-Multiplikationszähler auf der Grundlage des BC501A-Flüssigszintillationsdetektors untersucht. Zunächst wurden die Methode des Ladungsvergleichs, die Methode des Nulldurchgangs und die Methode der Anstiegszeit mit Hilfe des Geant4- und Matlab-Algorithmus verglichen, und das Ergebnis zeigt, dass die Methode des Ladungsvergleichs den höchsten Wert hat. Anschließend wurde ein System zur Neutronen-Gamma-Unterscheidung auf der Grundlage eines schnellen Neutronenmultiplikationszählers mit sechs Sonden gebaut und getestet, wobei sich herausstellte, dass der Mittelwert der Gütezahl 1,08 beträgt, was die zufriedenstellende Neutronen-Gamma-Unterscheidungsfähigkeit des Systems bestätigt. Bei den Uranium-Proben wurde die Masse mit dem schnellen Neutronenmultiplikationszähler ermittelt und die Anreicherung anhand der charakteristischen Gammastrahlensignale mit dem System gemessen. Die experimentellen Ergebnisse stimmen gut mit den tatsächlichen Daten überein.

Funding statement: The authors extend their sincere thanks to The National Nature Science Fund of China Grants Agreement Number 51309228 for the financial support for this work. The authors also thank the Postdoctoral Science Foundation of China for financial supporting this work (No. 2013M542459), and Shaanxi Technology Committee Natural Science Basic Research Project for financial supporting this work (No. 2016JM6026).


The authors are grateful to the precious comments made by anonymous reviewers.


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Received: 2021-02-18
Published Online: 2021-12-13
Published in Print: 2021-12-13

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