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Published in: Forensic Science, Medicine and Pathology 2/2018

01-06-2018 | Original Article

Distortion of the temporary cavity and its influence on staining in firearm barrels

Authors: Christian Schyma, Rolf Müller, Eva Brenčičová, Julia Brünig

Published in: Forensic Science, Medicine and Pathology | Issue 2/2018

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Abstract

After contact shots to the head, biological traces can be found inside the barrel of the firearm. Experimental protocols to generate this sort of staining, using 12 cm gelatin cubes containing thin foil bags filled with acrylic paint, human blood, and radiocontrast agent, have been developed. Previous research on shots fired at a distance has shown the underlay sustaining these gelatin cubes has an influence on experimental results. This study was conducted to investigate the role of the sustaining base of the gelatin blocks during contact shots, and its influence on the staining result inside firearm barrels. Eighteen contact shots were performed using 22 LR, 32 ACP (7.65 Browning) and 9 mm Luger semi-automatic pistols. With each pistol, shots were fired onto six gelatin cubes; three placed upon a rigid platform and three upon an elastic underlay. The shots were recorded by a high-speed video camera as they penetrated the gelatin cube. Any staining present inside the firearm barrels after the shots were fired was documented by endoscopy. Cross sections of the gelatin blocks were then compared to the high-speed video. It was found that the nature of the staining inside the barrel was not influenced by the underlay sustaining the target model. In the experiment using a 9 mm Luger, the rigid counterfort provoked a visible distortion of the temporary cavity, but, cross sectional analysis of the gelatin cubes did not reveal a relevant influence of the sustaining underlay on the crack length in the gelatin. This could be explained by a secondary expansion of the temporary cavity left by the projectile as a consequence of subsequent inflow of muzzle gases.
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Metadata
Title
Distortion of the temporary cavity and its influence on staining in firearm barrels
Authors
Christian Schyma
Rolf Müller
Eva Brenčičová
Julia Brünig
Publication date
01-06-2018
Publisher
Springer US
Published in
Forensic Science, Medicine and Pathology / Issue 2/2018
Print ISSN: 1547-769X
Electronic ISSN: 1556-2891
DOI
https://doi.org/10.1007/s12024-018-9971-0

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