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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 angled contact and near contact gunshot wounds

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 > > > > > angled contact and near contact gunshot wounds

  • Ammunition

  • Target

  • Muzzle-target-angles

  • Gunshot residues

  • Powder soot zone


Presenter sommai sangkaew 51312327

Ammunition angled contact and near contact gunshot wounds

Keyword


Presenter sommai sangkaew 51312327

Keyword angled contact and near contact gunshot wounds

Nitrocellulose (NC-powder)

The Content of a Bullet.


Presenter sommai sangkaew 51312327

Keyword angled contact and near contact gunshot wounds

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 angled contact and near contact gunshot wounds

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˚) angled contact and near contact gunshot wounds

Muzzle-Target angle(45˚)

Muzzle-Target angle

  • The angle in which the bullet hit the target


Presenter sommai sangkaew 51312327

Gunshot Residues angled contact and near contact gunshot wounds

  • 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 angled contact and near contact gunshot wounds

Powder soot zone

Inner powder soot zone

Outer powder soot zone


Presenter sommai sangkaew 51312327

PURPOSE angled contact and near contact gunshot wounds

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 > > > > > angled contact and near contact gunshot wounds

  • Gun

  • Cartridges

  • Target


Presenter sommai sangkaew 51312327

MATERIAL >> Gun angled contact and near contact gunshot wounds

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 angled contact and near contact gunshot wounds

.22 L.R

9mm Luger

.38 Spl


Presenter sommai sangkaew 51312327

MATERIAL >> Target angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

METHODS angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

RESULTS angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

RESULTS angled contact and near contact gunshot wounds

The Inner powdersoot zones point to the direction ofthe muzzle.


Presenter sommai sangkaew 51312327

RESULTS angled contact and near contact gunshot wounds

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 angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

RESULTS angled contact and near contact gunshot wounds

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 angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

DISCUSSION angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

DISCUSSION angled contact and near contact gunshot wounds

  • 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 angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

DISCUSSION angled contact and near contact gunshot wounds

  • 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 angled contact and near contact gunshot wounds

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


Presenter sommai sangkaew 51312327

SPECIAL THANKS angled contact and near contact gunshot wounds

  • 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.