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PRESENTER: Sommai Sangkaew 51312327

Gunshot residue patterns on skin in angled contact and near contact gunshot wounds. PRESENTER: Sommai Sangkaew 51312327. 1. 3. 2. The Importance of Gunshot Residues in Forensic. To identify how the weapon was use.

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PRESENTER: Sommai Sangkaew 51312327

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  1. Gunshot residue patterns on skin in angled contact and near contact gunshot wounds PRESENTER: Sommai Sangkaew 51312327

  2. 1 3 2 The Importance of Gunshot Residues in Forensic • To identify how the • weapon was use. • To identify the criminal.

  3. KEYWORD > > > > > • Ammunition • Target • Muzzle-target-angles • Gunshot residues • Powder soot zone

  4. Ammunition Keyword

  5. Keyword Nitrocellulose (NC-powder) The Content of a Bullet.

  6. Keyword 1: Revolver 2: Automatic Type of gun • A weapon that is used to shoot a bullet • Two type of gun: • Revolver gun • Automatic gun 1 2

  7. Target Keyword an object, usually marked with concentric circles, to be aimed at in shooting practice or contests.

  8. Muzzle-Target angle (0˚) Muzzle-Target angle(45˚) Muzzle-Target angle • The angle in which the bullet hit the target

  9. Gunshot Residues • Small particles from the barrel of a gun when it is fired • Consists of: • Antimony(Sb) • Barium(Ba) • Lead(Pb) Primer Gunshot Residue Particle identified by Scanning Electron Microscopy

  10. Keyword Powder soot zone Inner powder soot zone Outer powder soot zone

  11. PURPOSE To study the pattern and density of inner and outer powder soot zones which occur because of : • Type of ammunition • The barrel length • Muzzle-target angle • The distance from muzzle • to target.

  12. MATERIAL > > > > > • Gun • Cartridges • Target

  13. MATERIAL >> Gun 1) .38Smith and Wesson revolver 1 2) 9 mm SIG Pistol P210 automatic 2 3).22 L.R SIG Pistol P210 automatic 3

  14. MATERIAL >> Gun .22 L.R 9mm Luger .38 Spl

  15. MATERIAL >> Target • They used naturally tanned calf skin leather fixed on soap and gelatine block.

  16. METHODS The distance from muzzle to target is0,5,10,15 and20 mm

  17. RESULTS The Inner powdersoot zone can be more clearly defined and demarcated than outer powdersoot zone

  18. RESULTS The Inner powdersoot zones point to the direction ofthe muzzle.

  19. RESULTS When theMuzzle-target angle is increased, the Inner powdersoot zone will be wider but the density of gunshot residues will decrease

  20. RESULTS When the length of the barrel increases, the Inner powdersoot zone will be denser and smaller.

  21. RESULTS When the length of the barrel increases, the entrance hole will be on the rim of the inner powder soot zones.

  22. RESULTS The different types of the ammunitions will result in different densities of gunshot residues.

  23. DISCUSSION • Gunshot residues on the target surface can be differentiated in a inner and outer powder soot zone

  24. DISCUSSION • The outer powder soot zone is much less visible than the inner powder soot zone and may lack on human skin.

  25. DISCUSSION • With increasing muzzle target distance both inner and outer powder soot halo increase in size and decrease in density.

  26. DISCUSSION • In angled shots the inner powder soot halo shows an eccentric, elliptic shape which points towards the muzzle , regardless of ammunition, calibre and barrel length.

  27. DISCUSSION • The outer powder soot points away from the muzzle in angled contact and close contact shots

  28. SPECIAL THANKS • T. Plattner , B. Kneubuehi , M. Thali , U. Zollinger , • “ Gunshot residue patterns on skin in angled contact • and near contact gunshot wounds” • Associate Professor. Suda Riengrojpitak, Major adviser • Police Lieutenant Colonel. Suphareark Arepornrat , Miner adviser • Assistant Professor.Suksiri Vichasri Grams • Every attendee of the seminar.

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