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KMID : 0357520140370030223
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Journal of Radiological Science and Technology
2014 Volume.37 No. 3 p.223 ~ p.231
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Park Eun-tae
Ko Seong-Jin
Kim Jung-Hoon
Kang Se-Sik
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Abstract
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Medical linear accelerator is widely used in radiation treatment field, and high energy photons, above 10 MV nominal accelerator voltage, are commonly utilized for the radiation treatment. However, these high energy photons lead the photo-nuclear reaction and the generation of photo-neutrons are accompanied. Thus, these problematic factors are issued in the view of radiation protection. Therefore, linear accelerator and radiation treatment room are simulated from MCNPX program in this study. The measurement points of interest are selected and analyzed, and the resulting effects derived from the properties of photo-neutron are evaluated. Therefore, we realized that the number of generating photo-neutrons was decreased by depending on the distance from the source. No matter what the nominal energy is set, the rates thermal neutrons to fast neutrons are marginal. It is founded that the amount of the thermal neutrons were decreased by depending on the distance from the source.
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KEYWORD
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Medical linear accelerator, Photonuclear reaction, Photoneutron, MCNPX
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