Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Design and performance prediction of large-area hybrid gamma imaging system (LAHGIS) for localization of low-level radioactive material

  • Lee, Hyun Su (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Jae Hyeon (Department of Nuclear Engineering, Hanyang University) ;
  • Lee, Junyoung (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Chan Hyeong (Department of Nuclear Engineering, Hanyang University)
  • Received : 2020.03.30
  • Accepted : 2020.09.14
  • Published : 2021.04.25
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Abstract

In the present study, a large-area hybrid gamma imaging system was designed by adopting coded aperture imaging on the basis of a large-area Compton camera to achieve high imaging performance throughout a broad energy range (100-2000 keV). The system consisting of a tungsten coded aperture mask and monolithic NaI(Tl) scintillation detectors was designed through a series of Geant4 Monte Carlo radiation transport simulations, in consideration of both imaging sensitivity and imaging resolution. Then, the performance of the system was predicted by Geant4 Monte Carlo simulations for point sources under various conditions. Our simulation results show that the system provides very high imaging sensitivity (i.e., low values for minimum detectable activity, MDA), thus allowing for imaging of low-activity sources at distances impossible with coded aperture imaging or Compton imaging alone. In addition, the imaging resolution of the system was found to be high (i.e., around 6°) over the broad energy range of 59.5-1330 keV.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2017M2A8A4015258, NRF-2019M2D2A1A02059814) and Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government (MOTIE) (No. 20191510301040).

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