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Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
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新型成像解决方案用于量化,评估和比较枪支残留物模式.

Michael A Kusluski1, Malcolm Hreben2, Rachel S Bolton-King3

  • 1Forensic Science Program, 325A Whitmore Laboratory Building, Pennsylvania State University, University Park, PA 16802, USA.

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概括

使用修改的平板扫描仪的一种新的可量化的方法有效地比较了枪支残留物 (GSR) 模式. 这种光谱技术为传统测试提供了一个非破坏性的替代方案,增强了法医分析和模式比较.

关键词:
一个子弹的子弹.卡特里奇的使用方法枪支排放残留物 枪支排放残留物法医比较法医比较冲击损伤 冲击损伤 冲击损伤

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科学领域:

  • 法医科学 法医科学 法医科学
  • 分析化学 分析化学
  • 频谱学是一种光谱学.

背景情况:

  • 枪支残留物 (GSR) 分析对于重建枪击事件至关重要.
  • 现有的化学分析方法 (例如,改性格里斯,罗迪酸盐) 是破坏性的,危险的,缺乏可量化的.
  • 需要一种非破坏性的,可量化的方法来比较GSR模式.

研究的目的:

  • 提出一种新的,可量化的方法来比较GSR模式的原理证明.
  • 为了评估为蓝绿光 (BGF) 和红外反射 (IR) 模式修改的平板扫描仪的性能.
  • 评估弹药品牌和面料特征对GSR图案对比的影响.

主要方法:

  • 使用一个修改后的平板扫描仪在BGF (450nm激发/630nm屏障) 和IR (850nm) 模式下运行.
  • 采用韦伯对比方法来量化各种织物类型和颜色上的GSR图案.
  • 评估了9毫米Luger弹药品牌和248个代表性织物样本.

主要成果:

  • 不增强的韦伯对比度在棉织物上在弹药品牌之间从0.28到0.85不等.
  • 增强的对比度达到92% (BGF) 和91% (IR) 的评估样本的适当水平.
  • 韦伯增强对比度的中位数为10.3 (BGF) 和4.83 (IR),明显超过人类视觉感知值 (~0.1).

结论:

  • 修改后的光谱扫描仪提供了一种可量化的,非破坏性的方法来比较GSR模式.
  • 这种技术在法医实践和研究中显示出作为比较工具的巨大潜力.
  • 进一步的研究将探索其在估计口口到目标距离方面的应用.