通过使用同轴Ge探测器,为不同的大气波器几何形状采用一种新的效率校准方法
1Radiation Physics and Environment Group (FRYMA), Department of Integrated Sciences, Center for Natural Resources, Health and Environment (RENSMA), University of Huelva, 21071 Huelva, Spain.
Air quality, atmosphere, & health
|June 12, 2023
概括
本研究引入了一种用于校准探测器的新方法,以使用各种过器类型准确测量大气颗粒物 (PM) 中的放射性核素. 经过验证的技术确保了可靠的空气质量评估,用于环境辐射控制.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 核物理 核物理 核物理
背景情况:
- 评估空气质量需要分析大气颗粒物 (PM) 中的微量元素和放射性核化物等污染物.
- 气溶中的放射性核化物对于环境辐射监测和作为大气过程的标记物至关重要.
- 目前用于PM中的放射性核素分析的方法通常使用各种几何形状的过器,需要精确的探测器校准.
研究的目的:
- 开发一种用于校准同轴探测器的新和通用方法.
- 通过使用玛射线光谱测量,在各种波器类型中准确确定颗粒物中的放射性核素.
- 建立针对每个波器几何形状的全能峰值效率 (FEPEs) 的可靠校准函数.
主要方法:
- 使用颗粒式认证参考材料 (CRM) 与天然放射性核素 (U系列,Th系列,K-40) 来模拟颗粒沉积.
- 与液体CRM相比,采用固体CRM来提高同质性和沉积几何复制.
- 开发了一种方法,通过切割和堆叠来适应大型过器,以匹配沉积的PM的几何形状.
主要成果:
- 获得了各种能量的实验性全能峰值效率 (FEPEs),并将它们调配为每个过器类型的一般FEPE函数.
- 成功验证了自然和人工放射性核酸在广泛的能量范围 (46-1332 keV) 的方法.
- 在熟练度测试中使用的不同类型的过器中,通过z-score低于2获得了很好的一致性.
结论:
- 开发的方法提供了一种强大而通用的方法,用于校准探测器,用于颗粒物中的放射性核素分析.
- 这种技术提高了空气质量评估的准确性,因为它可以准确地确定各种过介质上的放射性核化物.
- 经过验证的方法适用于常规环境辐射控制和大气过程研究.
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