质子加速器治疗室辐射防护优化研究  

Study on the optimization of radiation protection for therapeutic proton synchrotron

作　　者：朱卫国[1] 梁婧[1] 侯长松[1] 练德幸[1] 张震 Zhu Weiguo;Liang Jing;Hou Changsong;Lian Dexing;Zhang Zhen(Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China;National Center for Occupational Safety and Health, NHC, Beijing 102308, China)

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088 [2]国家卫生健康委员会职业安全卫生研究中心,北京102308

出　　处：《中华放射医学与防护杂志》2019年第9期707-710,共4页Chinese Journal of Radiological Medicine and Protection

摘　　要：目的研究铁屏蔽体在主防护墙中不同深度对防护墙外周围剂量当量率的影响.方法采用FLUKA蒙特卡罗模拟程序构建了质子治疗室的模型,治疗室的屏蔽体由混凝土和钢构成.分别模拟220和250MeV的质子照射水模体,以获得不同情况下的周围剂量当量率分布.结果随着嵌入防护墙的铁屏蔽体深度的变化,两种模拟条件下质子治疗机房主防护墙外30cm处的周围剂量当量率发生显著变化,最大周围剂量当量率(220MeV:3.42μSv/h,250MeV:6.39μSv/h)比最小周围剂量当量率(220MeV:1.75μSv/h,250MeV:3.32μSv/h)高2倍.结论在质子治疗加速器的设计中,应仔细评估铁屏蔽体在主防护墙中的位置.Objective To investigate the effect of iron shield at different depths within main protection wall on the dose rate outside the protection wall. Methods By adopting the FLUKA code, a therapeutic room model was constructed with its primary protective barrier consisting of concrete and iron. In order to obtain its ambient dose equivalent rate distribution, the 250 MeV protons and 220 MeV protons impinging on water phantom were simulated separately. Results With varying depth of iron plate embedded in barrier, the ambient dose equivalent rates in the two simulated conditions differed sinificantly at 30 cm outside the protection wall. The maximum ambient dose equivalent rate(220 MeV:3.42 μSv/h, 250 MeV:6.39 μSv/h) was more than 2 times higher than the minimum ambient dose equivalent rate(220 MeV:1.75 μSv/h, 250 MeV:3.32 μSv/h). Conclusions In the design of therapeutic proton accelerator, it is essential to evaluate carefully the location where the iron shield is in main protection wall.

关 键 词：蒙特卡罗模拟 质子同步加速器 屏蔽 周围剂量当量率 

分 类 号：R144[医药卫生—公共卫生与预防医学]