Gunshot residue patterns                       on skin in angled contact and near     contact gunsho...
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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

Gunshot residue patterns on skin in angled contact and near contact gunshot wounds

PRESENTER: Sommai Sangkaew

51312327


Presenter sommai sangkaew 51312327

1

3

2

The Importance of Gunshot Residues in Forensic

  • To identify how the

  • weapon was use.

  • To identify the criminal.


Presenter sommai sangkaew 51312327

KEYWORD > > > > >

  • Ammunition

  • Target

  • Muzzle-target-angles

  • Gunshot residues

  • Powder soot zone


Presenter sommai sangkaew 51312327

Ammunition

Keyword


Presenter sommai sangkaew 51312327

Keyword

Nitrocellulose (NC-powder)

The Content of a Bullet.


Presenter sommai sangkaew 51312327

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


Presenter sommai sangkaew 51312327

Target

Keyword

an object, usually marked

with concentric circles,

to be aimed at in shooting

practice or contests.


Presenter sommai sangkaew 51312327

Muzzle-Target angle (0˚)

Muzzle-Target angle(45˚)

Muzzle-Target angle

  • The angle in which the bullet hit the target


Presenter sommai sangkaew 51312327

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


Presenter sommai sangkaew 51312327

Keyword

Powder soot zone

Inner powder soot zone

Outer powder soot zone


Presenter sommai sangkaew 51312327

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.


Presenter sommai sangkaew 51312327

MATERIAL > > > > >

  • Gun

  • Cartridges

  • Target


Presenter sommai sangkaew 51312327

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


Presenter sommai sangkaew 51312327

MATERIAL >> Gun

.22 L.R

9mm Luger

.38 Spl


Presenter sommai sangkaew 51312327

MATERIAL >> Target

  • They used naturally tanned calf skin leather fixed on soap and gelatine block.


Presenter sommai sangkaew 51312327

METHODS

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


Presenter sommai sangkaew 51312327

RESULTS

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


Presenter sommai sangkaew 51312327

RESULTS

The Inner powdersoot zones point to the direction ofthe muzzle.


Presenter sommai sangkaew 51312327

RESULTS

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


Presenter sommai sangkaew 51312327

RESULTS

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


Presenter sommai sangkaew 51312327

RESULTS

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


Presenter sommai sangkaew 51312327

RESULTS

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


Presenter sommai sangkaew 51312327

DISCUSSION

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


Presenter sommai sangkaew 51312327

DISCUSSION

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


Presenter sommai sangkaew 51312327

DISCUSSION

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


Presenter sommai sangkaew 51312327

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.


Presenter sommai sangkaew 51312327

DISCUSSION

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


Presenter sommai sangkaew 51312327

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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