Development of hybrid shielding system for large-area Compton camera: A Monte Carlo study

김재현; 이준영; 김영수; 이현수; 김찬형

doi:https://doi.org/10.1016/j.net.2020.04.003

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자료유형: 학술저널

저자정보: 김재현 (한양대학교) 이준영 (한양대학교) 김영수 (한국원자력의학원) 이현수 (한양대학교) 김찬형 (한양대학교)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제52권 제10호

발행연도: 2020.10

수록면: 2,361 - 2,369 (9page)

DOI: https://doi.org/10.1016/j.net.2020.04.003

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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.

#Compton camera #Background radiation #Hybrid shielding #Active shielding #Monte Carlo simulation

참고문헌 (9)

참고문헌 신청

R. W. Todd / 1974 / A proposed gamma camera / Nature 251:132~134

Y. Kim / 2018 / Large-area Compton camera for high-speed and three-dimensional imaging / IEEE Trans. Nucl. Sci 65:2817~2822

A. Poitrasson-Rivi ere / 2014 / Dual-particle imaging system based on simultaneous detection of photon and neutron collision events / Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrom. Detect. Assoc. Equip 760:40~45

S. Agostinelli / 2003 / GEANT4 - a simulation toolkit / Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrom. Detect. Assoc. Equip 506:250~303

A. Poitrasson-Rivi ere / 2015 / Monte Carlo investigation of a high-efficiency, two-plane Compton camera for longrange localization of radioactive materials / Prog. Nucl. Energy 81:127~133

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