| รหัสดีโอไอ | 10.14456/ssa.2020.14 |
|---|---|
| Creator | Thiti Mahacharoen |
| Title | DETECTION OF GUNSHOT RESIDUE CHEMICAL COMPONENTS BYMICROCRYTALLINE TESTS |
| Publisher | National Research Council of Thailand |
| Publication Year | 2020 |
| Journal Title | SOCIAL SCIENCE ASIA : Official Journal of National Research Council of Thailand In conjunction with Journal of Thai Justice System |
| Journal Vol. | 6 |
| Journal No. | 2 |
| Page no. | 56-68 |
| Keyword | Microcrystalline, Gunshot Residues, Polarized Light Microscope (PLM) |
| URL Website | http://e-journal.nrct.go.th/ |
| Website title | e-journal |
| ISSN | 2229-2608 |
| Abstract | This research studied and differentiated chemical properties of gunshot residue (GSR) by using a microcrystal technique with three reagents: Sulfuric acid, Oxalic acid and Potassium Iodide. This technique is also implemented as a valuable and relatively fast tool to examine and detect gunshot residue by using a Polarized Light Microscope (PLM) to distinguish chemical and optical properties of Antimony (Sb), Barium (Ba) and Lead (Pb). The weapons used in this study are a .38 mm revolver pistol and a 9 mm semi-automatic pistol. The results showed that GSR crystals occurred at a close range of shooting distance (less than 6 inches). For distances of 18 inches and further, fewer crystals formed and they were smaller in size. This is consistent with the theory of GSR existence varying at different shooting ranges. Different reagents and concentrations were specific for each element of GSR to lead to different crystal habits. This technique is an effective, fast, and inexpensive method of detecting each GSR element (Sb, Ba and Pb) and it is an effective technique for use in a laboratory or other forensic science unit with limited resources. |
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