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使用年龄取决于印度人口的BOMAB和voxel幻影的站立式全身计数器的计数效率
Rahul Roy1, Rajesh Sankhla2, Deepak K Akar2
1Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, 400085, India.
概括
准确的内部污染评估需要使用印度的voxel幻影,而不仅仅是标准的BOMAB幻影. 这项研究开发了身体大小依赖的方程,用于精确计数效率 (CEs) 在全身计数中.
科学领域:
- 医学物理 医学物理
- 辐射保护 辐射保护
- 计算剂量计计算剂量计.
背景情况:
- 像快速扫描全身计数器 (QSWBC) 这样的部分屏蔽系统对于检测内部污染至关重要.
- 对内部污染的准确评估依赖于精确的计数效率 (CE).
- 现有的模型经常使用通用幻象,可能导致不同人群中的不准确性.
研究的目的:
- 使用FLUKA代码数值建模QSWBC系统.
- 通过使用成年BOMAB幻影对实验数据进行计算模型的验证.
- 通过使用年龄依赖的印度声素幽灵来估计各种放射性核素的CE,并将其与BOMAB幽灵进行比较.
主要方法:
- 使用FLUKA代码对QSWBC几何学的数值建模.
- 使用成年BOMAB幻象的实验计数效率 (CEs) 验证模型.
- 通过重新调整ICRP参考幻象来构建年龄依赖的印度语音幻象.
- 蒙特卡洛模拟用于估计特定放射性核化物 (例如57Co,133Ba,137Cs,60Co,40K) 的CE.
主要成果:
- 在BOMAB和印度voxel幻影之间观察到CE的显著差异,印度幻影在较低的能量下显示高达68%的CE.
- 对于两个幻影类型,在所有能量中,CE随着身体构造指数 (BBI) 的增加而减少.
- 一般来说,CEs最初会随着光子能量的增加而增加,然后由于能量沉积的减少而减少.
- 随着年龄的增长,CE的效率下降,在1岁的幻影中发现的效率最高.
结论:
- 这项研究强调了为准确的内部剂量评估使用特定人群的voxel幻影的必要性.
- 使用BBI开发个性化,体型依赖的CE可以提高全身计数的精度.
- 这些发现对于加强职业工人和普通公众的内部剂量评估至关重要.
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