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KMID : 1151820200140030193
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Journal of the Korean Society of Radiology
2020 Volume.14 No. 3 p.193 ~ p.201
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A Study on Photon Characteristics Generated from Target of Electron Linear Accelerator for Container Security Inspection using MCNP6 Code
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Lee Chang-Ho
Kim Jang-Oh
Lee Yoon-Ji
Jeon Chan-Hee
Lee Ji-Eun
Min Byung-In
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Abstract
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The purpose of this study is to evaluate the photon characteristics according to the material and thickness of the electrons incidented through a linear accelerator. The computer simulation design is a linear accelerator target consisting of a 2 mm thick tungsten single material and a 1.8 mm and 2.3 mm thick tungsten and copper composite material. In the research method, First, the behavior of primary particles in the target was evaluated by electron fluence and electron energy deposition. Second, photons occurring within the target were evaluated by photon fluence. Finally, the photon angle-energy distribution at a distance of 1 m from the target was evaluated by photon fluence. As a result, first, electrons, which are primary particles, were not released out of the target for electron fluence and energy deposition in the target of a single material and a composite material. Then, electrons were linearly attenuated negatively according to the target thickness. Second, it was found that the composite material target had a higher photon generation than the single material target. This confirmed that the material composition and thickness influences photon production. Finally, photon fluence according to the angular distribution required for shielding analysis was calculated. These results confirmed that the photon generation rate differed depending on the material and thickness of the linear accelerator target. Therefore, this study is necessary for designing and operating a linear accelerator use facility for container security screening that is being introduced in the country. In addition, it is thought that it can be used as basic data for radiation protection.
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KEYWORD
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Container security inspection, MCNP6, Linear accelerator, Target, Photon characteristics
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