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超高剂量率电子加速器的辐射安全性用于FLASH放射治疗

Lars Hjorth Præstegaard¹

¹Department of Oncology, Aarhus University Hospital, Aarhus, Denmark.

Medical physics

|June 28, 2024

概括

用于FLASH放射治疗的超高剂量速率 (UHDR) 电子加速器在适当的屏蔽下正常运行是安全的. 然而,在测试期间长时间使用可能需要额外的安全措施,因为辐射增加.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
技术加速器技术加速器技术

背景情况:

用于FLASH放射治疗的超高剂量速率 (UHDR) 电子加速器产生强烈的制动辐射辐射,这给辐射安全带来了挑战.
制辐射剂量和诱导的放射性比传统放射治疗高得多,需要进行彻底的安全评估.
10 MeV以上的电子能量增加了加速器外的诱导放射性,需要仔细评估.

研究的目的:

为了评估一个原型FLASH支持的Varian真光束加速器的辐射安全性.
建立一个全面的框架来评估UHDR电子加速器在FLASH放射治疗中的辐射安全性.

主要方法:

制动辐射产生和诱导放射性的分析建模.
分析模型与NIST制动辐射产量数据和实验测量结果的比较.
测量一次性/二次性制动辐射和中子,用于支持16 MeV FLASH的Varian TrueBeam加速器.

主要成果:

分析工具得到了验证,计算的制动辐射产量显示与NIST数据的偏差为<8.5%.
分散薄膜制动辐射和被辐射的物体是二次制动辐射的主要来源.
开发和验证了一种评估高频高频电子加速器辐射安全性的一般框架.

结论:

支持FLASH的Varian TrueBeam加速器在用于传统放射治疗的掩体中正常运行是安全的.
在长时间运行时,UHDR加速器需要采取额外的安全措施,例如光束调节或测试.
工作负载考虑对于确定UHDR电子加速器现有屏蔽的充分性至关重要.

关键词:

闪光效应 (FLASH) 是一种闪光效应.车辐射的辐射车辐射电子加速器中的电子加速器.诱导活动诱导活动.中子中子中子中子.辐射安全辐射安全辐射屏蔽辐射屏蔽辐射疗法辐射疗法超高剂量速率 (UHDR) 是指超高剂量速率.

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