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精确的马射线剂量测量高达10 MeV的玻璃剂量计与BNCT的灵敏度控制波器

F Kamisaki¹, T Inoue¹, K Tomiyoshi¹

¹Graduate School of Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka, 565-0871, Japan.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

|April 13, 2024

概括

这项研究引入了一种使用放射光发光玻璃剂量计 (RPLGD) 的新方法,用于准确地测量混合辐射场中的马射线剂量,这对于子中子捕获疗法 (BNCT) 至关重要. 该方法对于标准源具有很好的准确性,但对于复杂的字段需要过器优化.

科学领域:

医学物理医学物理
辐射检测和测量辐射检测和测量
核工程核工程是指核工程.

背景情况:

中子捕获疗法 (BNCT) 是一种先进的癌症治疗方法,利用选择性细胞杀死.
BNCT处理场产生混合辐射场,包括中子和二次马射线.
准确的剂量测量对于有效和安全的BNCT输送至关重要.

研究的目的:

开发一种用于在混合中子-马场内选择性测量马射线剂量的新方法.
使用放射光发光玻璃剂量计 (RPLGD) 与为此目的量身定制的过器.
验证拟议方法的准确性,并确定限制.

主要方法:

采用了两个具有两种不同的灵敏度控制过器的RPLGD,使用铁作为过材料.
设计过器以确保剂量计的响应与空气克尔马系数成正比,独立于玛射线能量频谱.
在核燃料储存室中使用标准马射线源和体积源进行辐射实验.

主要成果:

该方法证明了空气克尔马系数在5.3%的误差范围内,在标准马射线源的10 MeV内,具有出色的复制性.
测量剂量与使用PHITS用于标准来源的理论计算有很好的一致性.
使用体积源的测量表明对马射线入射角度有显著的依赖,需要进一步调查.

结论:

拟议的方法可用于测量混合场中的玛射线剂量,特别是对于标准源.
马射线发生率对剂量计的角度依赖是体积源的关键因素.
未来的工作应该集中在设计更薄的过器,以减轻角效应,并提高复杂领域的准确性.

关键词:

在空中 kerma.贝叶斯估计贝叶斯估计中子捕获疗法 (BNCT) 是一种剂量估计剂量估计混合辐射场是一种混合辐射场.在RPLGD中,使用的是RPLGD.

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