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KMID : 1151820140080050249
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Journal of the Korean Society of Radiology
2014 Volume.8 No. 5 p.249 ~ p.254
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A Study on Photon Spectrum in Medical Linear Accelerator Based on MCNPX
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Park Eun-tae
Lee Dong-Yeon
Ko Seung-Jin
Kim Jung-Hoon
Kang Se-Sik
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Abstract
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Medical linear accelerator is used for radiotherapy since it was developed in 1952, the utilization rate is further increased. It is used high energy radiotherapy using the energy of the photon of 6 MeV or more is universal at present, but the creation of the neutron by photonuclear reaction cause a problem that is radiation exposure of patients and operators. Therefore, in this study, to analyze the spectrum of the photon beam of 6 to 24 MV that occurred in the medical linear accelerator using the Monte Carlo code MCNPX, the number of photons of 7.41 MeV or more, which is a neutron production threshold energy of tungsten and average energy. The result of 24 MV in the beginning and the 8 MV was 0.59% of the total number of detected photons and it was founded that the number of photons are increased which are possible to cause the photonuclear reaction.
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KEYWORD
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Medical linear accelerator, Photonuclear reaction, MCNPX, Threshold energy
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