塑料闪剂量计在磁场中的反应的系统性表征:II. 蒙特卡洛模拟的蒙特卡洛模拟
Yunuen Cervantes1,2, Simon Lambert-Girard3, Ilias Billas4
1Département de physique, de génie physique et d'optique, et Centre de recherche sur le cancer, Université Laval, Québec, Québec, Canada.
Physics in medicine and biology
|April 28, 2025
概括
使用TOPAS与g4em-penelope物理清单的蒙特卡洛模拟准确地模拟了塑料闪光剂量计 (PSD) 响应,电子流动和磁场中的切伦科夫辐射. 然而,模拟未能在磁场下重现实验性闪行为.
科学领域:
- 医学物理 医学物理
- 计算剂量计计算剂量计.
- 辐射检测检测器可以检测到辐射.
背景情况:
- 塑料闪剂量计 (PSD) 用于辐射测量.
- 磁场的存在可能会影响PSD响应.
- 在磁场中精确模拟PSD对于可靠的剂量测量至关重要.
研究的目的:
- 为了验证蒙特卡洛模拟在磁场中的塑料闪光剂量计 (PSD) 响应.
- 用不同的模拟物理清单来评估电子流动,剂量计算和光学过程 (闪,切伦科夫辐射) 的准确性.
- 将模拟结果与实验测量结果进行比较.
主要方法:
- 蒙特卡洛模拟使用EGSnrc和TOPAS进行.
- 使用各种物理清单 (g4em-penelope,g4em-standard_opt3,g4em-standard_opt4) 进行了电子流动和剂量计算.
- 模拟了切伦科夫辐射和PSD反应,并与理论预测和实验数据进行了比较.
主要成果:
- 在g4em-penelope物理清单中显示出平衡的性能,与EGSnrc一致,并且在磁场中表现出较低的变化.
- 剂量计算的准确度达到至少0.36% (法诺测试).
- 模拟准确地预测了切伦科夫辐射,但在磁场下的PSD反应中显示出差异 (高达21.0%),但未能再现实验闪行为.
结论:
- 具有g4em-penelope物理清单的TOPAS可靠地模拟磁场中的剂量,电子流动和切伦科夫辐射.
- 在模拟磁场下的闪过程中存在显著的差异,表明需要改进模型.
- 需要进一步的研究,以准确地代表磁场模拟中的闪现象.
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