The Advancement of a Technique Using Principal Component Analysis for the Non-Intrusive Depth Profiling of Radioactive Contamination
The Advancement of a Technique Using Principal Component Analysis for the Non-Intrusive Depth Profiling of Radioactive Contamination
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DOI：
10.1109/tns.2012.2189128
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发表时间：
2012-08-01
影响因子：
1.8
通讯作者：
Mellor, Matthew
中科院分区：
文献类型：
--
作者：
Adams, Jamie C.;Joyce, Malcolm J.;Mellor, Matthew
本文介绍了主成分分析技术的一个重要发展，它可以非侵入性地推断裂变碎片铯-137埋在硅砂下的深度。在本文中，我们描述了该技术的进步，通过进一步验证它使用盲测试的应用程序以外的实验室，不仅深度（z），而且表面（x，y）的伽马射线发射污染的位置往往很差的特点。还进行了不确定度分析，以测试该技术的稳健性。目前，该技术已在夹带伽马射线发射源上方的最大活动点（已知最佳x，y位置）进行了测试。这在特征不佳的环境中通常是不实际的，在该环境中，检测器不能方便地放置在这样的最佳位置以开始，并且通常需要在感兴趣区域周围的多个点处进行扫描。使用均匀的扫描时间，最大强度的点可以通过根据总计数率采样来定位，并且收敛于最大强度的这个最佳点。
A significant development of the principal component analysis technique, to non-intrusively infer the depth of the fission fragment cesium-137, when it is buried under silica sand has been described. In this paper we describe the advancement of the technique by further validating it using blind tests for applications outside of the laboratory, where not only the depth (z) but also the surface (x, y) location of gamma-ray emitting contamination is often poorly characterized. Also uncertainty analysis has been conducted to test the robustness of the technique. At present the technique has been tested at the point of maximum activity above the entrained gamma-ray emitting source (where the optimal x, y location is known). This is not usually practical in poorly characterized environments where the detector cannot be conveniently placed at such an optimal location to begin with and scanning at multiple points around the region of interest is often required. Using a uniform scanning time, the point of maximum intensity can be located by sampling in terms of total count rate, and converging on this optimal point of maximum intensity.