Applications of neutron-gamma analysis for chlorine determination in different materials (e.g., solids, aqueous solutions, and surface contaminations) are discussed. Solid samples were measured with a pulsed fast/thermal neutron analysis (PFTNA) system consisting of a pulsed neutron generator and sodium iodide gamma detectors and an associated particle imaging (API) system consisting of a neutron generator (with a built-in alpha detector) and sodium iodide gamma detector; all sample measurements were made under similar conditions (neutron flux values and detector-side area for crossing gamma flux). The advantages of PFTNA over the API method were demonstrated based on comparison of metrological parameters (i.e., minimal detectible level for a 1-h measurement period and clock time required to reach 5% measurement accuracy). For these reasons, the PFTNA system in scanning mode effectively identified areas of artificial chlorine contamination in the field. Paired with GPS, a chlorine contamination map was created from PFTNA scanning results; this map accurately identified the actual position and size of chlorine contaminated locations in the field. Chlorine-contaminated areas of ~4.5 m ² were effectively located within the ~500 m ² field during a ~2-h scanning period. Based on the results from this work, promising directions for further application of the PFTNA method are disclosure of chlorine contamination in soil and measurements of marine water salinity.

中文翻译：

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用于氯探测的中子受激伽马射线测量

讨论了中子伽马分析在不同材料（例如，固体、水溶液和表面污染物）中测定氯的应用。固体样品使用由脉冲中子发生器和碘化钠伽马探测器组成的脉冲快速/热中子分析 (PFTNA) 系统和由中子发生器（带有内置 α 探测器）组成的相关粒子成像 (API) 系统进行测量碘化钠伽马探测器；所有样品测量都是在类似条件下进行的（中子通量值和探测器侧穿过伽马通量的区域）。PFTNA 相对于 API 方法的优势是基于计量参数的比较（即 1 小时测量周期的最小可检测水平和达到 5% 测量精度所需的时钟时间）来证明的。由于这些原因，扫描模式下的 PFTNA 系统有效地识别了现场人工氯污染区域。与 GPS 配合使用，根据 PFTNA 扫描结果创建氯污染图；该地图准确地确定了现场氯污染地点的实际位置和大小。约 4.5 m 的氯污染区域 在~2 小时的扫描期间，²个有效地位于~500 m ²场内。基于这项工作的结果，进一步应用 PFTNA 方法的有希望的方向是土壤中氯污染的公开和海水盐度的测量。