Gunshot residue on dark materials: a comparison between infrared photography and the use of an alternative light source
| العنوان: | Gunshot residue on dark materials: a comparison between infrared photography and the use of an alternative light source |
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| المؤلفون: | Vera Barrera, S Panzer, Barbara Fliss, Stephan A. Bolliger |
| المساهمون: | University of Zurich, Barrera, V |
| المصدر: | International Journal of Legal Medicine. 133:1115-1120 |
| بيانات النشر: | Springer Science and Business Media LLC, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Materials science, Gunshot residue, Infrared, business.industry, 010401 analytical chemistry, 340 Law, 610 Medicine & health, 10218 Institute of Legal Medicine, 01 natural sciences, 0104 chemical sciences, Pathology and Forensic Medicine, 2734 Pathology and Forensic Medicine, 03 medical and health sciences, 0302 clinical medicine, Light source, Optics, Filter (video), 030216 legal & forensic medicine, business, Infrared photography |
| الوصف: | The pattern of gunshot residue (GSR) includes important information about muzzle-target distance since a larger GSR distribution diameter indicates a larger shooting distance. GSR may not be visible to the naked eye when, for example, it is located on dark textiles. In such cases, further procedures need to be performed in order to visualize the pattern of GSR. Besides chemical procedures, an alternative light source or infrared photography can be utilized for non-destructive GSR visualization. In the work presented, these two techniques are compared based on shooting experiments using 26 different dark textiles. Within the range of the alternative light source, the use of a 440-nm light in combination with an orange-colored filter led to the best visualization of GSR in the form of fluorescent particles. Infrared photography, on the other hand, visualized GSR as dark particles, whereas-ideally-the dark textile reflected the infrared light and appeared bright. The comparison of both techniques revealed that the GSR distribution visualized by infrared photography was not identical to the GSR distribution visualized with 440-nm illumination in combination with an orange-colored filter. We concluded that infrared photography visualizes the inner powder soot zone, whereas illumination at 440 nm leads to fluorescence of the outer powder soot zone, which can be visualized using an orange-colored filter. Knowledge of this difference in visualization of the two powder soot zones is important for forensic practitioners assessing firing distances. In the literature, however, this difference is not noted as clearly. |
| تدمد: | 1437-1596 0937-9827 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed66b889619d2216a77d3cc111e2e704 https://doi.org/10.1007/s00414-018-1965-7 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....ed66b889619d2216a77d3cc111e2e704 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14371596 09379827 |
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