Procedures for Validating the Performance of Instruments Used for Automated Inorganic Gunshot Residue Analysis

Published

August 1, 2020

Author(s)

Nicholas Ritchie, J Matney Wyatt, Doug DeGaetano, Ludwig Niewoehner, Frank Platek, David Edwards

Abstract

The reliability of forensic inorganic gunshot residue (iGSR) analysis depends strongly on the performance of the scanning electron microscope with energy dispersive X-ray spectrometer (SEM- EDX) instrument and the software that automates the data acquisition. Without a record of the baseline performance of the instrument, it is often hard to know when performance has deteriorated. This paper provides a set of tests which can be performed when the instrument is commissioned, or when significant modifications are made, to establish the baseline performance and a smaller set of tests that can be performed regularly to document the current performance of the instrument. Together, these represent a powerful way to establish, document and evaluate the performance of the instrumentation used for iGSR analysis. Furthermore, most of these tests are suitable for characterizing SEM-EDX instruments used for other forensic or non- forensic uses.

Citation

Forensic Chemistry

Pub Type

Journals

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Keywords

GSR, gunshot residue, automated SEM/EDX, SEM, EDX, EDS

Citation

Ritchie, N. , Wyatt, J. , DeGaetano, D. , Niewoehner, L. , Platek, F. and Edwards, D. (2020), Procedures for Validating the Performance of Instruments Used for Automated Inorganic Gunshot Residue Analysis, Forensic Chemistry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927874 (Accessed October 9, 2025)