Measurement and simulation of the new liquid organic scintillator response to fast neutrons

Liquid organic scintillators are important devices for measurements of neutron radiation. This work aims to develop and optimize the composition of liquid organic scintillators so it can be used for fast neutron spectrometry. As the neutron radiation is usually accompanied with γ ray radiation, it i...

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Autores principales:	Jánský Jaroslav, Janda Jiřĺ, Matěj Zdeněk, Mravec Filip, Košťál Michal, Cvachovec František
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/33da57401b7843b6b0ad189ec9aa7829
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spelling	oai:doaj.org-article:33da57401b7843b6b0ad189ec9aa78292021-12-02T17:12:46ZMeasurement and simulation of the new liquid organic scintillator response to fast neutrons2100-014X10.1051/epjconf/202125311006https://doaj.org/article/33da57401b7843b6b0ad189ec9aa78292021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_11006.pdfhttps://doaj.org/toc/2100-014XLiquid organic scintillators are important devices for measurements of neutron radiation. This work aims to develop and optimize the composition of liquid organic scintillators so it can be used for fast neutron spectrometry. As the neutron radiation is usually accompanied with γ ray radiation, it is important to have quality γ/n discrimination. The new cocktail for house made liquid organic scintillator is prepared and studied with intention of being able to separate gamma and neutron for neutron energies above 0.5 MeV while keeping lower constraints on practical use (e.g., sealing because of oxygen) than commercial liquid scintillators. In preceding work the composition of liquid scintillators was optimized. Two twocomponent scintillators were selected for further studies. Solvent DIPN (Di-iso-propyl-naphthalene Mixed Isomers) is selected for both. First is mixed with luminophore PYR (1-Phenyl-3-(2,4,6-trimethyl-phenyl)-2-pyrazoline) of concentration 5 g/l. Second is mixed with luminophore THIO (2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene) of concentration 5 g/l. In this work the response of scintillator to monoenergetic beam of neutrons was measured for multiple neutron energies at PTB in Braunschweig. The two parameter spectrometric system NGA-01 is used to analyze the energy and discrimination characteristics. 137 Cs and 60 Co are used as radiation sources for calibration with pure γ rays. Then the response of scintillator for same neutron energies was simulated using GEANT4. The dissipated energy in the scintillator in response to monoenergetic neutrons is obtained. Both, measured and simulated responses are compared. Functional dependence for yield of recoiled products is estimated. It is seen that main recoil product hydrogen proton is well observed in both. From the edge of proton response one can assume the yield for given neutron energy. The recoiled carbon ion (from elastic collision) is on the other side diﬃcult to observe in measured results but clearly seen in dissipated energy plots. It suggests that yield of carbon ion is very small relatively to proton yield. These results will serve as basis for response function evaluation of scintillator which is necessary for evaluation of unknown neutron spectra from measurements with scintillator.Jánský JaroslavJanda JiřĺMatěj ZdeněkMravec FilipKošťál MichalCvachovec FrantišekEDP SciencesarticlePhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 11006 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Jánský Jaroslav Janda Jiřĺ Matěj Zdeněk Mravec Filip Košťál Michal Cvachovec František Measurement and simulation of the new liquid organic scintillator response to fast neutrons
description	Liquid organic scintillators are important devices for measurements of neutron radiation. This work aims to develop and optimize the composition of liquid organic scintillators so it can be used for fast neutron spectrometry. As the neutron radiation is usually accompanied with γ ray radiation, it is important to have quality γ/n discrimination. The new cocktail for house made liquid organic scintillator is prepared and studied with intention of being able to separate gamma and neutron for neutron energies above 0.5 MeV while keeping lower constraints on practical use (e.g., sealing because of oxygen) than commercial liquid scintillators. In preceding work the composition of liquid scintillators was optimized. Two twocomponent scintillators were selected for further studies. Solvent DIPN (Di-iso-propyl-naphthalene Mixed Isomers) is selected for both. First is mixed with luminophore PYR (1-Phenyl-3-(2,4,6-trimethyl-phenyl)-2-pyrazoline) of concentration 5 g/l. Second is mixed with luminophore THIO (2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene) of concentration 5 g/l. In this work the response of scintillator to monoenergetic beam of neutrons was measured for multiple neutron energies at PTB in Braunschweig. The two parameter spectrometric system NGA-01 is used to analyze the energy and discrimination characteristics. 137 Cs and 60 Co are used as radiation sources for calibration with pure γ rays. Then the response of scintillator for same neutron energies was simulated using GEANT4. The dissipated energy in the scintillator in response to monoenergetic neutrons is obtained. Both, measured and simulated responses are compared. Functional dependence for yield of recoiled products is estimated. It is seen that main recoil product hydrogen proton is well observed in both. From the edge of proton response one can assume the yield for given neutron energy. The recoiled carbon ion (from elastic collision) is on the other side diﬃcult to observe in measured results but clearly seen in dissipated energy plots. It suggests that yield of carbon ion is very small relatively to proton yield. These results will serve as basis for response function evaluation of scintillator which is necessary for evaluation of unknown neutron spectra from measurements with scintillator.
format	article
author	Jánský Jaroslav Janda Jiřĺ Matěj Zdeněk Mravec Filip Košťál Michal Cvachovec František
author_facet	Jánský Jaroslav Janda Jiřĺ Matěj Zdeněk Mravec Filip Košťál Michal Cvachovec František
author_sort	Jánský Jaroslav
title	Measurement and simulation of the new liquid organic scintillator response to fast neutrons
title_short	Measurement and simulation of the new liquid organic scintillator response to fast neutrons
title_full	Measurement and simulation of the new liquid organic scintillator response to fast neutrons
title_fullStr	Measurement and simulation of the new liquid organic scintillator response to fast neutrons
title_full_unstemmed	Measurement and simulation of the new liquid organic scintillator response to fast neutrons
title_sort	measurement and simulation of the new liquid organic scintillator response to fast neutrons
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/33da57401b7843b6b0ad189ec9aa7829
work_keys_str_mv	AT janskyjaroslav measurementandsimulationofthenewliquidorganicscintillatorresponsetofastneutrons AT jandajirl measurementandsimulationofthenewliquidorganicscintillatorresponsetofastneutrons AT matejzdenek measurementandsimulationofthenewliquidorganicscintillatorresponsetofastneutrons AT mravecfilip measurementandsimulationofthenewliquidorganicscintillatorresponsetofastneutrons AT kostalmichal measurementandsimulationofthenewliquidorganicscintillatorresponsetofastneutrons AT cvachovecfrantisek measurementandsimulationofthenewliquidorganicscintillatorresponsetofastneutrons
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Measurement and simulation of the new liquid organic scintillator response to fast neutrons

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