Swabs or Stubs? It’s Not Even A Question

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Gunshot Residue Analysis Gunshot residue (GSR) has long been collected during criminal investigations.  Currently, the standard method for collecting primer GSR is using adhesive stubs which can then be analyzed via scanning electron microscopy (SEM).  Prior to SEM analysis, the most common method of analyzing primer GSR was atomic absorption which utilizes cotton swabs for […]

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Steel and Nitriding: XPS vs SEM – Which is the Correct Tool to Use?

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  • 9:21AM Dec 10, 2015
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This is the second in a series of blog posts on X-ray photoelectron spectroscopy (XPS) by Dr. Jerry LaSalle, an expert in XPS surface analysis and physical and powder metallurgy. Dr. LaSalle’s areas of concentration include stainless steel passivation qualification, metallurgical failure analysis, additive manufacturing, and powder metallurgy consultation. XPS determines nitrogen chemistry and depth of […]

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glass delamination pharmaceutical vial root cause

Making the Case: Using the SEM in Glass Delamination Investigations

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  • 10:07AM Mar 10, 2014
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The life sciences industry faces persistent challenges in assuring glass compatibility with products. One of the most serious challenges is that of glass delamination. Glass delamination, which occurs in vials, is a complex result of various factors including product composition, glass composition, glass forming temperature, and surface treatment. When delamination results in lamellae (flakes) or […]

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