FSC239Y5 Lecture Notes - Lecture 4: Scanning Electron Microscope, Gunshot Residue, Condensation
Document Summary
What we"re interested in is the primer. Detonation travels to main propellant, which shoots the bullet. Particles that contain all three elements: lead barium antimony. 1 inch diameter aluminium stub covered with double sided tape. More likely to collect from back of hand. But they need to be confirmed by a person. Samples not accepted after 8h of shooting: because assume that hands have been washed. Typically 5 or fewer gsr particles detected from handkit. Meaning: fired a gun, was near gun when fired, touched a surface with gsr on it. Gsr can"t be used for firing angle, distance determination, or to associate a specific gun or ammunition. Total number of gsr particles found can vary greatly. Pyrotechniques/fireworks: gsr producing fireworks have to be fired by a licenced person outdoors for a show, no consumer grade fireworks contain lead. Airbags: some use primer similar to that used in ammunition, these do produce gsr particles possible.
