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An official journal of Viet Nam National University Ho Chi Minh City, Viet Nam

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The dependence of neutron/gamma discrimination efficiency on demenstion of EJ-301 scintilator

Hai Nguyen Xuan 1
Hieu Phan Bao Quoc 1, *
Quy Vu Thi Thanh 2
Chuan Phan Van 3
Hai Nguyen Nang 3
Tung Le Van 3
Hung Nguyen Quang 4, 5
Anh Nguyen Ngoc 6
Hung Dinh Tien 7
Khang Pham Dinh 1

  1. Dalat Nuclear Research Institute, 01 Nguyen Tu Luc, Dalat, Lamdong, Vietnam
  2. Dalat College, 109 Yersin, Dalat, Lamdong, Vietnam
  3. Dalat University, Dalat, Lamdong, Vietnam
  4. Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh city, 700000, Vietnam
  5. Faculty of Natural Sciences, Duy Tan University, Danang City, 550000, Vietnam.
  6. Phenikaa Institute for Advanced Study (PIAS), Phenikaa University, Hanoi 12116, Viet Nam
  7. Military Institute of Chemical and Environmental Engineering (MICEE), Hanoi, Vietnam
Correspondence to: Hieu Phan Bao Quoc, Dalat Nuclear Research Institute, 01 Nguyen Tu Luc, Dalat, Lamdong, Vietnam. Email: hieupbq@dnri.vn.
Volume & Issue: Vol. 9 No. 1 (2025) | Page No.: 3257-3266 | DOI: 10.32508/stdjns.v8i4.1400
Published: 2025-03-31

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Copyright © 2025 by the author(s).

This article is published with open access by Viet Nam National University Ho Chi Minh City, Viet Nam. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0) which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

Abstract

This paper presents the results of research on the application of the Monte Carlo simulation method to investigate the dependence of neutron detection efficiency and neutron/gamma pulse discrimination capabilities on the size of a detector using the EJ-301 scintillator, supporting the design and development of neutron detectors. We constructed and evaluated eight cylindrical detector models with varying lengths and diameters using the Geant4 toolkit. The simulated detector models consist of a scintillator coupled with a light guide and a photomultiplier tube (PMT). The simulated pulse signals obtained from each model were analyzed to assess neutron/gamma discrimination using the digital charge integration (DCI) method, and neutron detection efficiency was determined at various energy thresholds. The neutron/gamma discrimination results were evaluated based on the Figure of Merit (FoM). The results showed that both neutron/gamma discrimination and neutron detection efficiency are significantly dependent on the detector size, particularly the variations in length and diameter. These findings are crucial for optimizing the design of neutron detectors using organic scintillators like EJ-301 or similar materials, aiming to enhance neutron/gamma discrimination and neutron detection efficiency.

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