Scanning electron microscopy combined with energy dispersive spectroscopy (SEM-EDS) is an essential tool in forensic laboratories worldwide. The technique provides both morphological imaging and elemental analysis of trace evidence, allowing examiners to identify and compare materials with high specificity.

The SNE-Alpha desktop SEM with integrated Bruker EDS brings forensic-grade analysis to police departments, crime labs, and educational institutions. Its compact size and ease of operation make it accessible for routine casework while delivering the resolution and analytical capabilities demanded by forensic standards.

Key Forensic Applications

• Gunshot Residue (GSR) Analysis: Detect and identify characteristic particles containing lead, barium, and antimony. Automated particle search locates GSR particles efficiently
• Fiber Analysis: Compare fiber morphology, surface characteristics, and cross-sectional shapes. Distinguish natural from synthetic fibers
• Paint Chip Comparison: Examine layer structure, pigment particles, and surface texture. Match chips to known sources
• Tool Mark Evidence: Image striations and impressions on metals, plastics, and other materials at high magnification
• Glass Analysis: Characterize glass fragment morphology and use EDS for elemental profiling
• Document Examination: Analyze inks, papers, and printing methods. Detect alterations and authenticate documents

GSR Analysis with SEM-EDS

Gunshot residue analysis remains one of the most important forensic applications of SEM-EDS. When a firearm is discharged, the primer produces microscopic particles that deposit on nearby surfaces and skin. These particles have characteristic spherical morphology and contain specific elemental combinations:

• Lead (Pb): From the primer and bullet
• Barium (Ba): From barium nitrate in the primer
• Antimony (Sb): From antimony sulfide in the primer

Particles containing all three elements are considered characteristic of GSR and provide strong evidence of firearm discharge.