GEANT4-based calibration of an organic liquid scintillator

Nicholai Mauritzson, KG Fissum, Hanno Perrey, John Annand, Robert Frost, Richard Hall-Wilton, R Jebali, Kalliopi Kanaki, Vendula Maulerova-Subert, Francesco Messi, Emil Rofors

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

A light-yield calibration of an NE 213A organic liquid scintillator detector has been performed using bothmonoenergetic and polyenergetic gamma-ray sources. Scintillation light was detected in a photomultipliertube, and the corresponding pulses were subjected to waveform digitization on an event-by-event basis. Theresulting Compton edges have been analyzed using a GEANT4 simulation of the detector which models boththe interactions of the ionizing radiation as well as the transport of scintillation photons. The simulation is calibrated and also compared to well-established prescriptions used to determine the Compton edges,resulting ultimately in light-yield calibration functions. In the process, the simulation-based method produced information on the gain and intrinsic pulse-height resolution of the detector. It also facilitated a previously inaccessible understanding of the systematic uncertainties associated with the calibration of the scintillation-light yield. The simulation-based method was also compared to well-established numerical prescriptions for locating the Compton edges. Ultimately, the simulation predicted as much as 17% lower light-yield calibrations than the prescriptions. These calibrations indicate that approximately 35% of the scintillation light associated with a given gamma-ray reaches the photocathode. It is remarkable how well two 50 year old prescriptions for calibrating scintillation-light yield in organic scintillators have stood the test of time.
Originalspråkengelska
Artikelnummer165962
Antal sidor8
TidskriftNuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
Volym1023
Tidigt onlinedatum2021 nov. 10
DOI
StatusPublished - 2022 jan. 21

Ämnesklassifikation (UKÄ)

  • Fysik
  • Acceleratorfysik och instrumentering

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