热中子检测和轨迹识别方法在参考和外场辐射疗法FLASH电子场使用Timepix3探测器
Cristina Oancea1,2, Jaroslav Solc3, Alexandra Bourgouin4
1ADVACAM, U Pergamenky 12, 170 00 Prague 7, Czech Republic.
Physics in medicine and biology
|August 22, 2023
概括
这项研究引入了一种新的方法来检测和测量水中的热中子流,使用专门的像素探测器和机器学习. 该技术在粒子治疗环境中准确量化热中子相当剂量.
科学领域:
- 医学物理 医学物理
- 辐射检测检测器可以检测到辐射.
- 微粒疗法是一种微粒疗法.
背景情况:
- 精确测量热中子流量对于粒子治疗中的辐射安全至关重要.
- 场外辐射,包括热中子,对剂量量定量构成挑战.
- 现有的方法可能缺乏水中测量所需的特异性和分辨率.
研究的目的:
- 开发和验证一种用于增强检测,成像和测量水中的热中子流量的方法.
- 量化热中子场的空间和时间特征.
- 在粒子治疗过程中,选择性地测量场外区域的热中子等效剂量.
主要方法:
- 使用Timepix3半导体像素探测器与6LiF中子转换器进行水中测量.
- 采用机器学习算法和模式识别来区分中子信号与其他辐射类型.
- 执行检测器效率校准,使用参考热中子场进行绝对流量测量.
- 应用蒙特卡洛模拟来确定从热中子流动到等效剂量的转换因子.
主要成果:
- 成功测量了热中子流量,并描述了其在水中的空间和时间分布.
- 量化了热中子相当剂量,发现它比输送的治疗剂量明显低 (∼9个数量级).
- 证明了该方法有能力选择性地识别和测量热中子轨迹,将其与玛射线和X射线区分开来.
结论:
- 提出的方法允许在水中精确量化热中子等效剂量.
- 这种技术对于提高辐射安全和了解粒子治疗中的场外剂量测量非常有价值.
- 机器学习用于轨道分析的使用提高了热中子检测的特异性和准确性.
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