| Deng Lei,Qu Shugen,Wang Zhe,Chen Yishui,Tu Yu,Zhang Lubing.Monte Carlo simulation of photoneutron for a 15 MV medical linear accelerator[J].Chinese Journal of Radiological Medicine and Protection,2023,43(12):1010-1015 |
| Monte Carlo simulation of photoneutron for a 15 MV medical linear accelerator |
| Received:January 26, 2023 |
| DOI：10.3760/cma.j.cn112271-20230126-00015 |
| KeyWords:Medical electron Accelerator Photonuclear reaction Neutron ambient dose equivalent Monte Carlo |
| FundProject:放射医学与辐射防护国家重点实验室资助项目(GZK1202019) |
| Author Name | Affiliation | E-mail | | Deng Lei | Institute of Occupational Medicine of Jiangxi, Nanchang 330006, China
State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection of Soochow University, Suzhou 215123, China | | | Qu Shugen | School of Public Health and Management, Wenzhou Medical University, Wenzhou 325035, China | | | Wang Zhe | Institute of Occupational Medicine of Jiangxi, Nanchang 330006, China | | | Chen Yishui | Institute of Occupational Medicine of Jiangxi, Nanchang 330006, China | | | Tu Yu | State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection of Soochow University, Suzhou 215123, China | | | Zhang Lubing | Institute of Occupational Medicine of Jiangxi, Nanchang 330006, China | 593886374@qq.com |
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| Abstract:: |
| Objective To study the photoneutron radiation field caused by photonuclear reaction during the operation of high energy medical linac.Methods Monte Carlo was used to simulate the photoneutron pollution of Clinic 2300CD medical electron accelerator in 15 MV X-ray mode. The photoneutron spectrum at different positions of the head and the variation in neutron ambient dose equivalent in different irradiation fields were investigated, and the dose distribution of photoneutron on the isocenter plane and the dose attenuation in the water model were analyzed.Results When the collimator was closed, the average photoneutron energy at the lower surface of target, primary collimator, flattening filter and multi-leaf collimator was 1.08, 1.20, 0.35 and 0.30 MeV, respectively. The neutron ambient dose equivalent at the isocenter first increased and then decreased with the irradiation field expanding, reaching the maximum in about 30 cm × 30 cm irradiation field. With the increase in the depth of the measuring point in water phantom, the neutron fluent first increased and then decreased, while the neutron dose gradually decreased. In different irradiation fields, the photoneutron dose rate was almost close to the background when the depth of the water was 20 cm.Conclusions By exploring the photoneutron spectrum and dose distribution characteristics of the high energy medical linac head, as well as the dose deposition mechanism of photoneutron in water phantom, this study provides data support for further research on the additional dose and secondary cancer effects on patients caused by photoneutron pollution from the high energy medical linac. |
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