Institut National de Criminalistique et Criminologie, Chaussée de Vilvorde 100, B-1120 Bruxelles, Belgium.
Forensic Sci Int. 2011 Oct 10;212(1-3):22-6. doi: 10.1016/j.forsciint.2011.05.001. Epub 2011 May 28.
Since 2008, our laboratory has adopted a systematic approach to the examination of gunshot residues (GSR) in casework by analysing, whenever possible, the inorganic composition present in ammunition (cartridge cases and unused ammunition). By compiling the results of these analyses in a database, it is possible to observe some trends during the period of interest: on the one hand, the prevalence of primers containing lead, barium and antimony is about 50%, and even as high as 70% when including lead-barium-antimony based primers also containing tin; on the other hand, the prevalence of non-toxic primers is for the time being very low. Still using the same approach, test firings were performed with recovered weapons and litigious ammunition whenever possible in order to estimate the influence of the well known "memory effect" of the weapons on the GSR analysis results. The first results show a quite strong memory effect for the .22 and the .32 caliber, unlike the .38 caliber. This is probably due to a high prevalence of lead-barium-antimony based primers for the latter caliber.
自 2008 年以来，我们的实验室通过分析弹药（弹壳和未使用的弹药）中存在的无机成分，采用系统的方法来检验法庭科学中的射击残留物（GSR）。通过将这些分析结果编制成数据库，可以观察到在感兴趣的时间段内的一些趋势：一方面，含有铅、钡和锑的底火的流行率约为 50%，而当包括也含有锡的基于铅-钡-锑的底火时，流行率甚至高达 70%；另一方面，无毒底火的流行率目前非常低。我们仍然使用相同的方法，尽可能对回收的武器和有争议的弹药进行测试射击，以评估武器的众所周知的“记忆效应”对 GSR 分析结果的影响。初步结果显示，对于.22 和.32 口径，存在相当强烈的记忆效应，而.38 口径则没有。这可能是由于后者口径的底火中含有大量的铅-钡-锑。
