在临床辐射治疗金库内对临床前BremstrahlungX射线FLASH放射治疗系统进行屏蔽分析
Andrew Rosenstrom, Mario Santana-Leitner1, Sayed Rokni1
1Radiation Protection Department, SLAC, MS 48, 2575 Sand Hill Road, Menlo Park, CA 94025.
Health physics
|July 17, 2023
概括
开发一个临床前放射治疗系统需要有效的屏蔽. 使用高Z和低Z材料的多层屏蔽显著减少了中子泄漏,确保了12 MV FLASH放射治疗期间的操作员和公共安全.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 辐射屏蔽 辐射屏蔽
背景情况:
- 一个临床前放射治疗系统使用12MV的bremsstrahlungX射线用于FLASH (信任导向,低剂量率,加速,立体) 放射治疗正在开发中.
- 高工作量需要高效的屏蔽来保护操作员和公众在低能 (6MV) X射线设计的金库内.
研究的目的:
- 评估和比较一个12 MV临床前放射治疗系统的治疗头部和辐射的屏蔽方法.
- 评估使用高Z和低Z材料的单层和多层屏蔽设计.
主要方法:
- 使用蒙特卡洛代码FLUKA进行详细的辐射传输模拟.
- 应用了国家辐射保护和测量委员会 (NCRP) 报告151.1的经验方法.
- 设计并比较了两个处理头屏蔽配置:单层和多层.
主要成果:
- 与同等大小的单层设计相比,多层屏蔽设计减少了17%的中子流动.
- 这种减少中子流动导致操作人员和公众的有效剂量下降.
- 蒙特卡洛模拟表明,高Z/低Z多层屏蔽对12个MV处理头有效.
结论:
- 通过蒙特卡洛模拟优化的高Z/低Z多层屏蔽为12 MV外部束放射治疗系统提供了有效的设计.
- 实证屏蔽评估方法可能需要修改,以准确考虑处理头屏蔽中的聚乙烯等材料.
- 多层屏蔽优于单层设计,用于减轻高能临床前放射治疗系统中的中子泄漏.
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