Neutron-Induced Scintillation in Organics

Research output: ThesisDoctoral Thesis (compilation)

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Neutrons are widely used as probes of matter to study materials in a broad range of fields from physics, chemistry and medicine to material sciences. Any application utilizing neutrons needs to employ a well-understood and optimized neutron-detector system. This thesis is centered on fundamental aspects of neutron-detector development, including the establishment of the Source Testing Facility at Lund University, experimental methods for the in-depth characterization of scintillator-based neutron detectors and analytical and computational methods for the precise interpretation of results. It focuses on the response of liquid organic scintillators to fast-neutron and gamma-ray irradiations, specifically for NE 213A, EJ 305, EJ 331 and EJ 321P. A simulation-based method for detector calibration was developed which allowed for the use of polyenergetic gamma-ray sources in this low energy-resolution environment. With an actinide/beryllium neutron source and a time-of-flight setup, beams of energy-tagged neutrons were used to study the energy-dependent behaviour of the intrinsic pulse-shape of NE 213A and EJ 305 scintillators. The results demonstrated the advantages of the neutron-tagging method and how the combination of neutron tagging and pulse-shape discrimination can give deeper insight into backgrounds resulting from inelastic neutron scattering. A comprehensive characterization of the neutron scintillation-light yield for NE 213A, EJ 305, EJ 331 and EJ 321P was also performed. It employed the simulation-based calibrations to confirm existing light-yield parametrizations for NE 213A and EJ 305, and resulted in light-yield parametrizations for EJ 331 and EJ 321P extracted for the first time from data. In addition to the development of a simulation-based framework for the study of neutron-induced scintillation in organic scintillators, the methods and results presented in this thesis lay the foundation for future source-based neutron-tagging efforts and scintillator-detector research and development.
Original languageEnglish
  • Fissum, Kevin, Supervisor
  • Perrey, Hanno, Assistant supervisor
  • Messi, Francesco, Assistant supervisor
  • Frost, Robert, Assistant supervisor
Award date2023 Mar 31
ISBN (Print)978-91-8039-556-4
ISBN (electronic) 978-91-8039-557-1
Publication statusPublished - 2023 Feb 20

Bibliographical note

Defence details
Date: 2023-03-31
Time: 13:15
Place: Rydbergsalen, Fysicum. Join via zoom: passcode: 214891
External reviewer(s)
Name: Davinson, Thomas
Title: Professor
Affiliation: University of Edinburgh, UK

Subject classification (UKÄ)

  • Natural Sciences
  • Physical Sciences


  • liquid organic scintillator
  • oil
  • time-of-flight
  • neutron tagging
  • light yield
  • simulation
  • calibration
  • NE 213A
  • EJ 305
  • EJ 331
  • EJ 321P
  • Source Testing Facility
  • pedagogy
  • Fysicumarkivet A:2023:Mauritzson


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