Measuring and unfolding fast neutron spectra using solution-grown trans-stilbene scintillation detector

Nguyen Duy Quang; HongJoo Kim; Phan Quoc Vuong; Nguyen Duc Ton; Uk-Won Nam; Won-Kee Park; JongDae Sohn; Young-Jun Choi; SungHwan Kim; SukWon Youn; Sung-Joon Ye

Nuclear Engineering and Technology (Mar 2023)

Measuring and unfolding fast neutron spectra using solution-grown trans-stilbene scintillation detector

Nguyen Duy Quang,
HongJoo Kim,
Phan Quoc Vuong,
Nguyen Duc Ton,
Uk-Won Nam,
Won-Kee Park,
JongDae Sohn,
Young-Jun Choi,
SungHwan Kim,
SukWon Youn,
Sung-Joon Ye

Affiliations

Nguyen Duy Quang: Department of Physics, Kyungpook National University, Daegu, 41566, South Korea
HongJoo Kim: Department of Physics, Kyungpook National University, Daegu, 41566, South Korea; Corresponding author.
Phan Quoc Vuong: Department of Physics, Kyungpook National University, Daegu, 41566, South Korea
Nguyen Duc Ton: Department of Physics, Kyungpook National University, Daegu, 41566, South Korea
Uk-Won Nam: Space Science Division, Korea Astronomy and Space Science Institute, Daejeon, 34055, South Korea
Won-Kee Park: Space Science Division, Korea Astronomy and Space Science Institute, Daejeon, 34055, South Korea
JongDae Sohn: Space Science Division, Korea Astronomy and Space Science Institute, Daejeon, 34055, South Korea
Young-Jun Choi: Space Science Division, Korea Astronomy and Space Science Institute, Daejeon, 34055, South Korea
SungHwan Kim: Department of Radiological Science, Cheongju University, Cheongju, 28503, South Korea
SukWon Youn: Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 08826, South Korea
Sung-Joon Ye: Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 08826, South Korea

Journal volume & issue: Vol. 55, no. 3
pp. 1021 – 1030

Abstract

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We propose an overall procedure for measuring and unfolding fast neutron spectra using a trans-stilbene scintillation detector. Detector characterization was described, including the information on energy calibration, detector resolution, and nonproportionality response. The digital charge comparison method was used for the investigation of neutron-gamma Pulse Shape Discrimination (PSD). A pair of values of 600 ns pulse width and 24 ns delay time was found as the optimized conditions for PSD. A fitting technique was introduced to increase the trans-stilbene Proton Response Function (PRF) by 28% based on comparison of the simulated and experimental electron-equivalent distributions by the Cf-252 source. The detector response matrix was constructed by Monte-Carlo simulation and the spectrum unfolding was implemented using the iterative Bayesian method. The unfolding of simulated and measured spectra of Cf-252 and AmBe neutron sources indicates reliable, stable and no-bias results. The unfolding technique was also validated by the measured cosmic-ray induced neutron flux. Our approach is promising for fast neutron detection and spectroscopy.

Published in Nuclear Engineering and Technology

ISSN: 1738-5733 (Print)
Publisher: Elsevier
Country of publisher: Korea, Republic of
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: http://www.journals.elsevier.com/nuclear-engineering-and-technology

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