presenter: sommai sangkaew 51312327
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Gunshot residue
patterns on
skin in angled
contact and near contact gunshot wounds
PRESENTER: Sommai Sangkaew
51312327
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•To identify how the weapon was use. •To identify the criminal.
1
2
3
The Importance of Gunshot Residues in
Forensic
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• Ammunition• Target• Muzzle-
target-angles
• Gunshot residues
• Powder soot zone
KEYWORD > > > > >
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Ammunition
Keyword
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The Content of a Bullet.Nitrocellulose (NC-powder)
Keyword
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• A weapon that is used to shoot a bullet
• Two type of gun:– Revolver gun– Automatic gun
1 2
1: Revolver2: Automatic
Keyword Type of gun
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Keyword Targetan object, usually marked
with concentric circles, to be aimed at in shooting practice or contests.
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• The angle in which the bullet hit the target
Muzzle-Target angle (0˚)
Muzzle-Target
angle(45˚)
Muzzle-Target angle
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• 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
Gunshot Residues
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Outer powder soot zone
Inner powder soot zone
KeywordPowder soot zone
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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.
PURPOSE
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MATERIAL > > > > >
• Gun• Cartrid
ges• Target
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1) .38 Smith and
Wesson revolver
2) 9 mm SIG Pistol
P210 automatic3).22 L.R SIG Pistol
P210 automatic
MATERIAL >> Gun
1
2
3
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.22 L.R
9mm Luger.38 Spl
MATERIAL >> Gun
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• They used naturally tanned calf skin leather fixed on soap and gelatine block.
MATERIAL >> Target
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Type of gun
Muzzle-target angle
Lengths of barrels
ammunition
.38 magnum
20, 30, 45,60
- .38 Spl
9 mm SIG Pistol
20, 30, 45,60
- 9 mm
22 L.R SIG Pistol
20, 30, 45,60
150, 250, 650
22 L.R
The distance from muzzle to target is 0,5,10,15 and 20 mm
METHODS
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The Inner powder soot zone can be more clearly defined and demarcated than outer powder soot zone
RESULTS
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The Inner powder soot zones point to the direction of the muzzle.
RESULTS
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When the Muzzle-target
angle is increased, the Inner powder soot zone will be wider but
the density of gunshot
residues will decrease
RESULTS
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When the length of the
barrel increases,
the Inner powder soot zone will
be denser and smaller.
RESULTS
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When the length of the barrel increases,
the entrance
hole will be on the rim
of the inner powder
soot zones.
RESULTS
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The different types of the ammunitions will result in
different densities of
gunshot residues.
RESULTS
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• Gunshot residues on the target
surface can be
differentiated in a
inner and outer
powder soot zone
DISCUSSION
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• The outer powder soot zone is much less visible than the inner powder soot zone and may lack on human skin.
DISCUSSION
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•With increasing muzzle target distance both inner and outer powder soot halo increase in size and decrease in density.
DISCUSSION
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•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.
DISCUSSION
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•The outer powder soot points away from the muzzle in angled contact and close contact shots
DISCUSSION
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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.