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KMID : 0357520200430050383
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Journal of Radiological Science and Technology
2020 Volume.43 No. 5 p.383 ~ p.388
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Study on Effective Shielding of Secondary Radiation Generated by High Energy Proton Accelerator
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Bae Sang-Il
Kim Jung-Hoon
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Abstract
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High-energy proton accelerators continue to be increasingly used in medical, research and industrial settings. However, due to the high energy of protons, a large number of secondary radiation occurs. Among them, neutrons are accompanied by difficulties of shielding due to various energy distribution and permeability. So In this study, we propose a shielding method that can shield neutrons most efficiently by using multiple-shielding material used as a decelerating agent or absorbent as well as a single concrete shielding. The flux of secondary neutrons showed a greater decrease in the flux rate when heavy concrete was used than in the case of ordinary concrete, and the maximum flux reduction was observed at the front position when using multiple shields. Multiple shielding can increase shielding efficiency more than single shielding however, As the thickness of the multiple shielding materials increased, the decline in flux was saturated. The mixture material showed higher shielding results than the polyethylene when using boron carbonate.
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KEYWORD
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High energy proton accelerator, Neutron, Multiple shielding, Shielding efficiency, MCNPX
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