医用电子直线加速器治疗机房入口辐射剂量分析

doi:10.13491/j.issn.1004-714X.2022.06.004

中国辐射卫生

2022, Vol. 31

Issue (6): 663-668 DOI: 10.13491/j.issn.1004-714X.2022.06.004

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医用电子直线加速器治疗机房入口辐射剂量分析

许志强, 耿继武, 贾育新, 张灶钦, 王美霞

广东省职业病防治院，广东广州 510300

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

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摘要目的探究加速器机房入口辐射剂量，指导机房入口防护检测。方法利用FLUKA程序构建加速器机头及机房模型，模拟加速器在10 MV和600 cGy/min条件下，比较不同机架角度、照射条件和迷路情况下机房入口内侧的辐射剂量率。结果不同迷路内墙厚度和机架角条件下，有水箱时入口剂量率明显大于无水箱情况。迷路内墙厚度为1 800 mm，机架角为90°时入口剂量率最大。迷路内墙厚度为1 000 mm，机架角为0°和180°时，入口剂量率明显大于其他情况。迷路内墙为1.80 m、机架角为90°、有水箱、迷路内入口宽为1 400～2 200 mm时，机房入口处剂量率在（82.26 ± 48.95）～（314.09 ± 96.34） μSv/h。结论加速器机房入口处的剂量主要来自于有用线束在患者体表的散射和泄漏辐射，入口剂量率随迷路内口宽度递增。在入口防护检测时，机架角度的选取要考虑迷路内墙厚度，在不明确情况下对4个角度进行检测，保证检测结果的全面和准确。

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	许志强
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关键词 ：加速器, 机房入口剂量率, FLUKA程序

收稿日期: 2022-06-07

PACS:

X591

基金资助:广东省医学科研基金（A2021250）广东省职业病防治重点实验室（2017B030314152）

作者简介: 许志强（1988—），男，湖南衡南人，工程师，从事放射防护工作。E-mail：1079220561@qq.com

引用本文:

许志强, 耿继武, 贾育新, 张灶钦, 王美霞. 医用电子直线加速器治疗机房入口辐射剂量分析[J]. 中国辐射卫生, 2022, 31(6): 663-668.
XU Zhiqiang, GENG Jiwu, JIA Yuxin, ZHANG Zaoqin, WANG Meixia. Analysis of radiation dose at the entrance of the medical linear accelerator treatment room. Chinese Journal of Radiological Health, 2022, 31(6): 663-668.

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