A key challenge in multi-energy X-ray inspection systems is the effect of object positioning on material discrimination accuracy. This study addresses the issue by conducting experiments with various materials placed at different positions. Four wedge-shaped samples were tested at different heights and angles within a standard dual-energy cargo inspection system. The results demonstrated that object positioning significantly influences the distribution of radiation reaching the detectors, mainly due to variations in the amount of Compton-scattered X-rays. These changes notably affect material discrimination curves. Additionally, placing objects farther from the accelerator enhanced material discrimination accuracy by 4-14% and improved detection precision by 4%–14% for some detectors. The findings highlight the need for precise control over experimental conditions to achieve optimal material discrimination results. The insights gained from this study can contribute to optimizing multi-energy X-ray inspection systems, improving material discrimination capabilities, and enhancing precision in threat detection.

中文翻译：

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物体定位和康普顿散射对高能 X 射线货物扫描中材料鉴别的影响


多能量 X 射线检测系统的一个关键挑战是物体定位对材料区分精度的影响。本研究通过对放置在不同位置的各种材料进行实验来解决这个问题。在标准的双能货物检测系统中，在不同的高度和角度测试了四个楔形样品。结果表明，物体位置显着影响到达探测器的辐射分布，主要是由于康普顿散射 X 射线数量的变化。这些更改特别影响材质判别曲线。此外，将物体放置在离加速器较远的地方，可将某些探测器的材料区分精度提高 4-14%，并将检测精度提高 4%-14%。这些发现强调了对实验条件进行精确控制以获得最佳材料鉴别结果的必要性。从这项研究中获得的见解有助于优化多能 X 射线检测系统，提高材料鉴别能力，并提高威胁检测的精度。