Kersh Kyla L, Childers James M, Justice Dale, Karim Greg
Texas Tech University, Institute for Forensic Science, 4434 South Loop 289, Lubbock, TX.
J Forensic Sci. 2014 May;59(3):754-62. doi: 10.1111/1556-4029.12409. Epub 2014 Mar 18.
Detection of gunshot residue (GSR) is an arduous task for investigators. It is often accomplished with chemical tests, which can reveal elements and ions indicating the presence of GSR, but are likely to cause physical alteration to the pattern. In this study, the Spex Forensics Mini-CrimeScope MCS 400, along with 16 accompanying wavelength filters, was applied to various GSR patterns and target types. Three dark shirt materials, four ammunition calibers, and eight ammunition manufacturers, along with the primer residue of the different manufacturer ammunitions were tested. Results indicate the alternate light source wavelength of 445 nm to be the optimal setting. In addition, target material plays a large role in the preservation of GSR patterns as particles burn. Furthermore, it can be extrapolated that residue, observed from a full round and firing distance of six inches, is mostly composed of unburnt gunpowder residue, not primer residue.
对调查人员来说，检测枪击残留物（GSR）是一项艰巨的任务。通常通过化学测试来完成，这些测试可以揭示表明存在GSR的元素和离子，但很可能会对图案造成物理改变。在本研究中，将Spex法医迷你犯罪现场勘查仪MCS 400以及16个配套的波长滤光片应用于各种GSR图案和目标类型。测试了三种深色衬衫材料、四种弹药口径、八个弹药制造商以及不同制造商弹药的底火残留物。结果表明，445纳米的交替光源波长是最佳设置。此外，目标材料在GSR图案因颗粒燃烧而保存方面起着很大作用。此外，可以推断，在六英寸的完整子弹和射击距离下观察到的残留物主要由未燃烧的火药残留物组成，而非底火残留物。
