Network algorithms for detection of radiation sources
Network algorithms for detection of radiation sources
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DOI：
10.1016/j.nima.2015.01.037
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发表时间：
2015-06-01
影响因子：
1.4
通讯作者：
Wu, Chase Q.
中科院分区：
文献类型：
--
作者：
Rao, Nageswara S. V.;Sen, Satyabrata;Wu, Chase Q.
最近开发了辐射计数器网络，用于检测低水平的危险辐射源，并已用于室内和室外特性测试。随后，使用多个子网络“重播”测试测量结果，从而能够分析测试之外的各种场景。我们提出了一种粒子滤波器算法，该算法结合了整个网络中伽马计数器的测量结果来检测辐射源。利用室外测试的回放，我们构建了一个边界监控场景，该场景由部署在外围的 12 个 2 英寸 x 2 英寸 NaI 探测器或计数器组成，用于监控 42 x 42 m(2) 区域。 Cs-137 源移动穿过该区域，从外部几米处开始，最后远离该区域。使用粒子滤波器算法重放单个、成对和边界探测器的测量结果。算法输出从数量和质量上证明了将所有边界计数器联网的好处：源在进入该区域之前、在内部时以及直到移动几米远之前都被检测到。另一方面，当计数器单独或成对使用时，检测到源的持续时间要短得多，有时在区域内根本检测不到。 (C) 2015 Elsevier B.V. 保留所有权利。
Networks of radiation counters have been recently developed for detecting low-level, hazardous radiation sources, and they have been utilized in indoor and outdoor characterization tests. Subsequently, the test measurements have been "replayed" using multiple sub-networks, which enabled the analysis of various scenarios beyond the tests. We present a particle filter algorithm that combines measurements from gamma counters across the network to detect radiation sources. Using replays from an outdoor test, we construct a border monitoring scenario that consists of twelve 2 in. x 2 in. NaI detectors or counters deployed on the periphery to monitor a 42 x 42 m(2) region. A Cs-137 source is moved across this region, starting several meters outside and finally moving away from it The measurements from individual, pairs and boundary detectors are replayed using the particle filter algorithm. The algorithm outputs demonstrate, both quantitatively and qualitatively, the benefits of networking all boundary counters: the source is detected meters before it enters the region, while being inside, and until moving several meters away. On the other hand, when counters are used individually or in pairs, the source is detected for much shorter durations, and sometimes not detected at all while inside the region. (C) 2015 Elsevier B.V. All rights reserved.