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When a gun is fired, small particles
are generated during the explosion of the primer,
and leave the gun via the smoke.
The particles are deposited on objects in the immediate
environment of the weapon (body, clothing, etc.)
These small particles are called gunshot residue
(GSR).
Particles are very characteristic, so their presence
provides evidence of a gun having been fired.
Particles normally consist of Pb (lead), Sb (antimony)
and Ba (barium). Newer ammunitions contain other
characteristic materials |
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| The following
are photomicrographs of a gunshot residue particle |
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| As seen in initial scan |
A section cut through a GSR particle
made by a
focussed ion beam (FIB). |
A section cut through a GSR particle. |
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| Photographs courtesy of FEI Company, Eindhoven |
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