|
|
|
| Analysis of radiation dose at the entrance of the medical linear accelerator treatment room |
| XU Zhiqiang, GENG Jiwu, JIA Yuxin, ZHANG Zaoqin, WANG Meixia |
| Guangdong Province Hospital for Occupational Disease Prevention and Treatment, Guangzhou 510300 China |
|
|
|
|
Abstract Objective To investigate the radiation dose at the entrance of the accelerator treatment room, and to guide the radiation protection detection at the entrance of the treatment room. Methods The FLUKA program was used to build the model of accelerator head and treatment room. Under the simulation conditions of 10 MV and 600 cGy/min for the accelerator, the radiation dose rate inside the entrance of the treatment room was measured at different gantry angles, irradiation conditions, and labyrinths. Results The entrance dose rate with a water tank was significantly higher than that without a water tank under different inner labyrinth wall thicknesses and gantry angles. The entrance dose rate reached the maximum at the inner labyrinth wall thickness of 1800 mm and the gantry angle of 90°. When the inner labyrinth wall thickness was 1000 mm and the gantry angles were 0° and 180°, the entrance dose rate was significantly higher than that at other conditions. The dose rate at the entrance of the treatment room reached (82.26 ± 48.95) μSv/h to (314.09 ± 96.34) μSv/h under the following conditions: the inner labyrinth wall thickness of 1800 mm, the gantry angle of 90°, with a water tank, and the width of the inner labyrinth entrance of 1400-2200 mm. Conclusion The dose at the entrance of the accelerator treatment room mainly comes from the scattering and leakage radiation of the useful wire harness on the patient’s body surface, and the entrance dose rate increases with the increase in the width of the inner labyrinth entrance. In the entrance protection test, the gantry angle should be determined considering the inner labyrinth wall thickness, and the test should be performed at four angles in the uncertain case to ensure the comprehensiveness and accuracy of test results.
|
|
Received: 07 June 2022
|
|
|
|
|
|
[1] 周泽宸, 余红平, 陈大方. 健康中国行动与肿瘤精准健康管理[J]. 中国癌症防治杂志,2020,12(5):495-500. DOI: 10.3969/j.issn.1674-5671.2020.05.02
Zhou ZC, Yu HP, Chen DF. Healthy China action and accurate health management of cancer[J]. Chin J Oncol Prev Treat, 2020, 12(5): 495-500. DOI: 10.3969/j.issn.1674-5671.2020.05.02
[2] 原雅艺, 左雅慧. 放射治疗诱导的二次原发肿瘤的研究进展[J]. 中国辐射卫生,2019,28(2):209-213. DOI: 10.13491/j.issn.1004-714X.2019.02.026
Yuan YY, Zuo YH. Advances in secondary primary tumors induced by radiation therapy[J]. Chin J Radiol Health, 2019, 28(2): 209-213. DOI: 10.13491/j.issn.1004-714X.2019.02.026
[3] 郎锦义. 中国放疗三十年回顾、思考与展望[J]. 肿瘤预防与治疗,2017,30(1):1-4. DOI: 10.3969/j.issn.1674-0904.2017.01.001
Lang JY. Review, reflection and prospect of radiotherapy in China in the past 30 years[J]. J Cancer Control Treat, 2017, 30(1): 1-4. DOI: 10.3969/j.issn.1674-0904.2017.01.001
[4] 李东, 刘平, 季芳, 等. 基于蒙卡GEANT4研究某放疗场所的辐射水平分布规律[J]. 中国辐射卫生,2018,27(4):413-416. DOI: 10.13491/j.issn.1004-714X.2018.04.034
Li D, Liu P, Ji F, et al. Research on radiation distribution rule of a radiation therapy place based on GEANT4 Monte Carlo progress[J]. Chin J Radiol Health, 2018, 27(4): 413-416. DOI: 10.13491/j.issn.1004-714X.2018.04.034
[5] Ferrari A, Sala P R, Fassò A, et al. FLUKA: a multi-particle transport code[R]. Menlo Park: SLAC National Accelerator Lab, 2021: 43-295.
[6] 邹剑明, 许志强, 耿继武, 等. 基于蒙特卡罗方法的质子治疗室屏蔽防护探讨[J]. 中国辐射卫生,2019,28(4):443-446. DOI: 10.13491/j.issn.1004-714X.2019.04.026
Zou JM, Xu ZQ, Geng JW, et al. Radiation shielding design of proton therapy treatment room based on the Monte Carlo method[J]. Chin J Radiol Health, 2019, 28(4): 443-446. DOI: 10.13491/j.issn.1004-714X.2019.04.026
[7] 金潇, 严源, 韩春彩. 高能质子治疗系统辐射环境影响评价关键问题探讨[J]. 中国辐射卫生,2020,29(1):65-68. DOI: 10.13491/j.issn.1004-714X.2020.01.015
Jin X, Yan Y, Han CC. Discussion on some key issues in radiation environmental impact assessment of high energy proton therapy system[J]. Chin J Radiol Health, 2020, 29(1): 65-68. DOI: 10.13491/j.issn.1004-714X.2020.01.015
[8] 赵洪斌, 张新, 包尚联, 等. 电子直线加速器辐射场优化的蒙特卡洛模拟(英文)[J]. 南京航空航天大学学报,2010,27(1):7-12. DOI: 10.3969/j.issn.1005-1120.2010.01.002
Zhao HB, Zhang X, Bao SL, et al. Monte Carlo simulation of radiation field optimization for medical linac[J]. Trans Nanjing Univ Aeronaut Astronaut, 2010, 27(1): 7-12. DOI: 10.3969/j.issn.1005-1120.2010.01.002
[9] 时颖华, 周凌宏, 刘迎军, 等. 6 MV医用电子直线加速器的蒙特卡罗模拟[J]. 中华放射医学与防护杂志,2011,31(2):220-224. DOI: 10.3760/cma.j.issn.0254-5098.2011.02.028
Shi YH, Zhou LH, Liu YJ, et al. Monte Carlo simulation of 6 MV medical electron linear accelerator[J]. Chin J Radiol Med Prot, 2011, 31(2): 220-224. DOI: 10.3760/cma.j.issn.0254-5098.2011.02.028
[10] 中华人民共和国卫生部. GBZ/T 201.2—2011 放射治疗机房的辐射屏蔽规范 第2部分: 电子直线加速器放射治疗机房[S]. 北京: 中国标准出版社, 2011.
Ministry of Health of the People's Republic of China. GBZ/T 201.2—2011 Radiation shielding requirements for radiotherapy room. Part 2: radiotherapy room of electron linear accelerators[S]. Beijing: Standards Press of China, 2011.
[11] 傅强, 王璐, 刘芳, 等. 某医用电子加速器机房的屏蔽核算探讨[J]. 中国辐射卫生,2017,26(4):404-407. DOI: 10.13491/j.cnki.issn.1004-714X.2017.04.007
Fu Q, Wang L, Liu F, et al. Discussion on radiological protection calculation on the main shieldings of a medical electron accelerator room[J]. Chin J Radiol Health, 2017, 26(4): 404-407. DOI: 10.13491/j.cnki.issn.1004-714X.2017.04.007
[12] National Council on Radiation Protection and Measurements. Structural shielding design and evaluation for megavoltage X-and gamma-ray radiotherapy facilities[R]. NCRP Report No. 151, Bethesda: NCRP, 2005.
[13] 周媛媛, 杨春勇, 王福如, 等. 不同照射条件下医用加速器机房辐射水平验证检测[J]. 中国辐射卫生,2014,23(1):11-13. DOI: 10.13491/j.cnki.issn.1004-714X.2014.01.004
Zhou YY, Yang CY, Wang FR, et al. Verification testing of radiation levels of medical accelerator rooms under different irradiation conditions[J]. Chin J Radiol Health, 2014, 23(1): 11-13. DOI: 10.13491/j.cnki.issn.1004-714X.2014.01.004
|
|
|
|
