Neutron-Induced Scintillation in Organics

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

120 Nedladdningar (Pure)


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.
  • Fissum, Kevin, handledare
  • Perrey, Hanno, Biträdande handledare
  • Messi, Francesco, Biträdande handledare
  • Frost, Robert, Biträdande handledare
Tilldelningsdatum2023 mars 31
ISBN (tryckt)978-91-8039-556-4
ISBN (elektroniskt)978-91-8039-557-1
StatusPublished - 2023 feb. 20

Bibliografisk information

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

Ämnesklassifikation (UKÄ)

  • Naturvetenskap
  • Fysik


Utforska forskningsämnen för ”Neutron-Induced Scintillation in Organics”. Tillsammans bildar de ett unikt fingeravtryck.

Citera det här