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Passive detection of radionuclides from weak and poorly resolved gamma-ray energy spectra.

机译:从弱和较差分辨的伽马射线能谱中被动检测放射性核素。

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摘要

Large passive detectors used in screening for special nuclear materials at ports of entry are characterized by poor spectral resolution, making identification of radionuclides a difficult task. Most identification routines, which fit empirical shapes and use derivatives, are impractical in these situations. Here I develop new, physics-based methods to determine the presence of spectral signatures of one or more of a set of isotopes. Gamma-ray counts are modeled as Poisson processes, where the average part is taken to be the model and the difference between the observed gamma-ray counts and the average is considered random noise. In the linear part, the unknown coefficients represent the intensites of the isotopes. Therefore, it is of great interest not to estimate each coefficient, but rather determine if the coefficient is non-zero, corresponding to the presence of the isotope. This thesis provides new selection algorithms, and, since detector data is undoubtedly finite, this unique work emphasizes selection when data is fixed and finite.
机译:用于筛选进入港口特殊核材料的大型无源探测器的特点是光谱分辨率差,使放射性核素的鉴定成为一项艰巨的任务。在这些情况下,大多数适合经验形状并使用导数的识别例程都不切实际。在这里,我开发了新的基于物理学的方法来确定一组同位素中一个或多个同位素的光谱特征的存在。将伽马射线计数建模为泊松过程,其中将平均部分作为模型,并将观察到的伽马射线计数与平均值之间的差视为随机噪声。在线性部分,未知系数代表同位素的强度。因此,非常重要的是不要估计每个系数,而是确定该系数是否为非零(对应于同位素的存在)。本文提供了新的选择算法,并且由于检测器数据无疑是有限的,因此这项独特的工作着重于数据固定且有限的情况下的选择。

著录项

  • 作者

    Kump, Paul.;

  • 作者单位

    The University of Iowa.;

  • 授予单位 The University of Iowa.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 206 p.
  • 总页数 206
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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