Special Section on Research Center Řež: Nuclear-Engineering Activities in 2018

Testing of Scintillation Detectors in Quasi-Monoenergetic Neutron Spectra in a Silicon Filtered Neutron Beam at the LVR-15 Research Reactor

[+] Author and Article Information
Michal Košťál

Research Center Rez, Ltd.,
Husinec-Rez 250 68, Czech Republic
e-mail: Michal.Kostal@cvrez.cz

Zdeněk Matěj

Faculty of Informatics,
Masaryk University,
Botanická 15,
Brno 612 00, Czech Republic

Filip Mravec

Faculty of Informatics,
Masaryk University,
Botanická 15,
Brno 612 00, Czech Republic

František Cvachovec

Department of Mathematics and Physics,
University of Defence,
Kounicova 65,
Brno 612 00, Czech Republic

Martin Schulc, Vlastimil Juříček, Vojtěch Rypar, Jaroslav Šoltés, Evžen Losa, Ladislav Viererbl

Research Center Rez, Ltd.,
Husinec-Rez 250 68, Czech Republic

1Corresponding author.

Manuscript received July 19, 2018; final manuscript received March 11, 2019; published online May 29, 2019. Assoc. Editor: Leon Cizelj.

ASME J of Nuclear Rad Sci 5(3), 030915 (May 29, 2019) (5 pages) Paper No: NERS-18-1054; doi: 10.1115/1.4043197 History: Received July 19, 2018; Revised March 11, 2019

With increasing needs of neutron detection in energy and homeland security sectors, there is an aim in the development of new suitable detection materials with possible n/g separation and also satisfactory resolution. This issue is connected with a well-defined neutron field. The neutron standards 252Cf(spontaneous fission) and 235U(nth fission) have smooth spectra; thus, the tests in these fields can be used for testing of neutron gamma pulse shape discrimination (PSD), but cannot reveal possible problems in the deconvolution. New neutron field which is formed from fission spectrum filtered by 1 m thick silicon block was developed in Research Center Rez. Due to the course of the silicon cross section, the well-distinguished neutron peaks occur in filtered neutron spectrum. In this field, various scintillation materials, HIDEX Aqualight, and EJ299-33A were tested.

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Grahic Jump Location
Fig. 1

Upper and side view of LVR-15, a red arrow shows the position of the HK-1 beam

Grahic Jump Location
Fig. 2

Calculated and measured neutron spectrum (stilbene 10 × 10 mm2) at the measuring position 0.46 m from the end of beam port

Grahic Jump Location
Fig. 3

Illustration of the integration method used in discriminating particle response

Grahic Jump Location
Fig. 4

Pulse shape discrimination of studied scintillators

Grahic Jump Location
Fig. 5

Proton recoil spectra for various crystals in 0.12 m Bi and 0.15 m lead filter

Grahic Jump Location
Fig. 6

Comparison of neutron spectra measured by stilbene 10 × 10 mm and plastic scintillator EJ299-33A



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