Abstract
In this report, we evaluated an automated SEM/EDX (EDAX DxGSR) system of gunshot residue (GSR) by comparing an automated analysis method with the manual analysis method, and applied the automated method to the analysis of GSR distribution on a shooter's hand. The GSR numbers found by the two methods were not equal but were correlative. On a shooter's hand, the relative GSR density was highest at the middle phalanx of the forefinger, which pulled the trigger of a .38 SPL revolver. The GSR particles detected from the hand were classified into five groups by form and six groups by size. The “spheroidal” and “roundish” forms accounted for 79% of all GSR particles, and the size of under 1 μm accounted for 67% of all GSR particles.
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