Nuclear Engineering and Technology

  • 제52권10호
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  • Pages.2361-2369
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  • 2020
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Development of hybrid shielding system for large-area Compton camera: A Monte Carlo study

  • Kim, Jae Hyeon (Department of Nuclear Engineering, Hanyang University) ;
  • Lee, Junyoung (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Young-su (National Radiation Emergency Medical Center, Korea Institute of Radiological & Medical Science) ;
  • Lee, Hyun Su (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Chan Hyeong (Department of Nuclear Engineering, Hanyang University)
  • 투고 : 2019.09.17
  • 심사 : 2020.04.03
  • 발행 : 2020.10.25
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초록

Compton cameras using large scintillators have been developed for high imaging sensitivity. These scintillator-based Compton cameras, however, mainly due to relatively low energy resolution, suffer from undesired background-radiation signals, especially when radioactive materials' activity is very low or their location is far from the Compton camera. To alleviate this problem for a large-size Compton camera, in the present study, a hybrid-type shielding system was designed that combines an active shield with a veto detector and a passive shield that surrounds the active shield. Then, the performance of the hybrid shielding system was predicted, by Monte Carlo radiation transport simulation using Geant4, in terms of minimum detectable activity (MDA), signal-to-noise ratio (SNR), and image resolution. Our simulation results show that, for the most cases, the hybrid shielding system significantly improves the performance of the large-size Compton camera. For the cases investigated in the present study, the use of the shielding system decreased the MDA by about 1.4, 1.6, and 1.3 times, increased the SNR by 1.2-1.9, 1.1-1.7, and 1.3-2.1 times, and improved the image resolution (i.e., reduced the FWHM) by 7-8, 1-6, and 3-5% for 137Cs, 60Co, and 131I point source located at 1-5 m from the imaging system, respectively.

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