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논문 기본 정보

자료유형
학술저널
저자정보
Zhao Dong (Nanjing University of Aeronautics and Astronautics) Jia Wenbao (Nanjing University of Aeronautics and Astronautics) Hei Daqian (Nuclear Power Institute of China Chengdu) Cheng Can (Nanjing University of Aeronautics and Astronautics) Cheng Wei (Nanjing University of Aeronautics and Astronautics) Liang Xuwen (Nanjing University of Aeronautics and Astronautics) Li Ji (Nuclear Power Institute of China)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제5호
발행연도
2023.5
수록면
1,587 - 1,592 (6page)
DOI
10.1016/j.net.2023.02.003

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초록· 키워드

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Time-encoded imagers (TEI) are important class of instruments to search for potential radioactive sources to prevent illicit transportation and trafficking of nuclear materials and other radioactive sources. The energy of the radiation cannot be known in advance due to the type and shielding of source is unknown in practice. However, the response function of the time-encoded imagers is related to the energy of neutrons or gamma-rays. An improved image reconstruction method based on MLEM was proposed to correct for the energy induced response difference. In this method, the count vector versus time was first smoothed. Then, the preset response function was adaptively corrected according to the measured counts. Finally, the smoothed count vector and corrected response were used in MLEM to reconstruct the source distribution. A one-dimensional dual-particle time-encode imager was developed and used to verify the improved method through imaging an AmeBe neutron source. The improvement of this method was demonstrated by the image reconstruction results. For gamma-ray and neutron images, the angular resolution improved by 17.2% and 7.0%; the contrast-to-noise ratio improved by 58.7% and 14.9%; the signal-to-noise ratio improved by 36.3% and 11.7%, respectively.

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