Study of backspatter using high-speed video of experimental gunshots.

Schyma, Christian; Baumann, Fabienne; Madea, Burkhard; Gotsmy, Walther (2021). Study of backspatter using high-speed video of experimental gunshots. Forensic science, medicine, and pathology, 17(1), pp. 36-46. Springer 10.1007/s12024-020-00326-0

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Backspatter is biological material that is ejected from the entry wound against the line of fire. This phenomenon was also observed in wound ballistic simulations using so called "reference cubes" (12 cm edge length, 10% gelatin, 4 °C, paint pad beneath the cover). High-speed video records from 102 experimental shots to these target models using full metal jacketed bullets in the calibers .32 auto, .38 special, 9 mm Luger and .357 Magnum were analyzed for chronology, morphological appearance and velocity of fluid ejection. Generally, a short tail splashing of surface material occurred when the bullet was penetrating the target. In 51 shots from distance (≥ 5 cm), regardless of caliber and shot range, a linear jet of fluid started in connection with the first collapse of the temporary cavity. The initial velocity of the jet was measured between 6 and 45 m/s. The jet was streaming on for about 60 to 100 ms with a stochastic deviation of ± 13° to the horizontal. Close range and contact shots showed earlier and faster (up to 330 m/s) backspatter depending on the cartridge and the gap between muzzle and target. Gaseous aerosol-like spray and cone-like spatter indicated an increasing influence of muzzle gases with decreasing shot range. Even under standardized experimental conditions, variations of backspatter were observed in near/contact shots.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Legal Medicine > Forensic Medicine
04 Faculty of Medicine > Service Sector > Institute of Legal Medicine

UniBE Contributor:

Schyma, Christian; Baumann, Fabienne and Gotsmy, Walther

ISSN:

1556-2891

Publisher:

Springer

Language:

English

Submitter:

Antoinette Angehrn

Date Deposited:

06 Jan 2021 10:08

Last Modified:

19 Feb 2021 01:33

Publisher DOI:

10.1007/s12024-020-00326-0

PubMed ID:

33315179

Uncontrolled Keywords:

Backspatter Biological traces Firearm Muzzle gases Suicide Wound ballistics

BORIS DOI:

10.48350/149691

URI:

https://boris.unibe.ch/id/eprint/149691

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