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基于Geant4模拟的点样和体积样本的HPGe探测器上的检测效率的确定

Mu Lin¹, Yang Wang¹, Zhi Qin¹

¹Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.

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

|August 23, 2023

概括

一种新的Geant4模拟方法准确计算了医学同位素样品的检测效率,克服了精确放射性测量的校准源限制.

科学领域:

核化学核化学核化学
医学物理医学物理
辐射检测检测器可以检测到辐射.

背景情况:

在IMP的医疗同位素生产产生各种水性放射性同位素样本,需要准确的纯度和放射性评估.
高纯度 (HPGe) 探测器对于放射性核素纯度评估至关重要,但IMP缺乏校准标准.
准确的量化对于产生的放射性同位素的医学应用至关重要.

研究的目的:

开发一种高效的Geant4模拟方法来计算检测效率曲线.
为了应对具有不同几何形状和组成的样本准确放射性测定的挑战.
为了验证模拟方法与实验测量对比.

主要方法:

利用Geant4模拟来模拟不同样本几何形状,组成和源到探测器距离的探测器效率.
通过测量多核点源来确定晶体尺寸和死层厚度.
应用EFFTRAN代码进行巧合总和纠正,并将模拟的全能峰值 (FEP) 效率与实验数据进行比较.

主要成果:

Geant4模拟准确预测了点状和体积152Eu源的检测效率.
模拟的FEP效率与不同距离 (5-50厘米) 的实验结果有很好的一致性.
该方法证实了Geant4模拟在放射性量化中的令人满意的精度.

结论:

Geant4模拟是一种可行且精确的方法,用于确定各种样本类型的检测效率.
这种方法有效地解决了由样本几何形状和组成引起的效率校准问题.
经过验证的模拟方法支持对医学同位素进行准确的放射性核素纯度评估和放射性量化量化.

关键词:

有效性校准的校准效率.在 Geant4 模拟中使用 Geant4.这是一个HPGe检测器.放射性量化的量化放射性.卷度标准来源卷度标准来源

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