A new quantitative method for gunshot residue analysis by ion beam analysis
A new quantitative method for gunshot residue analysis by ion beam analysis
复制标题
DOI：
10.1039/c3an00597f
复制
发表时间：
2013-01-01
期刊：
影响因子：
4.2
通讯作者：
Bailey, Melanie J.
中科院分区：
文献类型：
--
作者：
Christopher, Matthew E.;Warmenhoeven, John-William;Bailey, Melanie J.
使用配备能量色散X射线光谱仪（SEM-EDS）的扫描电子显微镜对枪弹残留物（GSR）颗粒进行成像和分析是一种标准技术，可以提供重要的法医证据，但由于对微量元素的敏感性较低且难以从小颗粒中获得定量结果，因此该技术的辨别能力受到限制。提出了一种使用扫描质子微束和粒子诱导 X 射线发射 (mu-PIXE) 以及弹性背散射光谱 (EBS) 的更快的新方法，用于对单个 GSR 粒子的元素组成进行非破坏性定量分析。本研究中，GSR颗粒均为Pb、Ba、Sb。评估该方法的精密度。不同品牌弹药的分组行为是通过多变量分析确定的。该协议正确地对此处研究的弹药筒进行分组，置信度 >= 99%，无论选择的枪支或粒子数量如何。
Imaging and analyzing gunshot residue (GSR) particles using the scanning electron microscope equipped with an energy dispersive X-ray spectrometer (SEM-EDS) is a standard technique that can provide important forensic evidence, but the discrimination power of this technique is limited due to low sensitivity to trace elements and difficulties in obtaining quantitative results from small particles. A new, faster method using a scanning proton microbeam and Particle Induced X-ray Emission (mu-PIXE), together with Elastic Backscattering Spectrometry (EBS) is presented for the non-destructive, quantitative analysis of the elemental composition of single GSR particles. In this study, the GSR particles were all Pb, Ba, Sb. The precision of the method is assessed. The grouping behaviour of different makes of ammunition is determined using multivariate analysis. The protocol correctly groups the cartridges studied here, with a confidence >= 99%, irrespective of the firearm or population of particles selected.