FSC239Y5 Lecture : FSC239 Jan 20 2011
Document Summary
What happens when the trigger is pulled? firing pin strikes the primer cup primer is crushed, things go boom the heat causes the primer to vapourize particles re-solidify quickly, deposit on shooter and nearby objects and people. What is gsr? particles that contain all three elements: lead, barium, antimony typically spherical, about 1-10 nanometre. We are actually looking for residues of the primer. Pdr would be a better name, but it is rarely used. Gsr collection kit contains instructions, questionnaire, gloves, 2 cfs seals, and 2 pairs of sampling stubs stubs: 1 in diameter, aluminium stub covered with double sided tape o. How is gsr detected? scanning electron microscopy energy dispersive x-ray (sem/edx) automated analysis. 24-48 hours to run hand kit instrument flags particles, but they need to be confirmed by a person. What does gsr look like? shape indicated rapid solidification about 1/20 the width of hair.
