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GSR2005—Continuity of the ENFSI Proficiency Test on Identification of GSR by SEM/EDX

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Abstract: 

Within the framework of the ENFSI Expert Working Group “Firearms” a proficiency test on the detection and identification of GSR by energy-dispersive scanning electron microanalysis (SEM/EDX) is carried out in a 2 years term. The latest test was performed in 2005/2006 and was denoted as GSR2005. Seventy-five laboratories from 28 countries participated in this proficiency test and submitted in total 83 independent data-sets. The participating laboratories were requested to determine the total number of PbSbBa containing particles on a synthetic test sample following their own laboratory specific methods of automated GSR particle search and detection by SEM/EDX. Furthermore size and position of the detected particles had to be reported by the laboratories and were evaluated statistically. The results were compiled by means of z-scores according to the IUPAC and EURACHEM guidelines—assessing individual laboratory achievements (inter-laboratory) as well as intra-laboratory performance—and were compared to the results of the previous proficiency test run GSR2003 ( 1). The comparison shows that there is a noticeable improvement in the method’s detection capability.
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Keywords: ENFSI; GSR; SEM/EDX; forensic science; gunshot residues; proficiency testing; scanning electron microscopy; z-scores

Document Type: Research Article

Affiliations: 1: Forensic Science Institute, BKA, D-65173 Wiesbaden, Germany. 2: National Laboratory of Forensic Science, SKL, SE-58194 Linkoeping, Sweden. 3: Netherlands Forensic Institute, NFI, NL-2497 GB Den Haag, The Netherlands. 4: National Bureau of Investigation, NBI, PL 285, FIN-01301 Vantaa, Finland. 5: QuoData Ges. für Qualitaetsmanagement und Statistik mbH, Kaitzer Str. 135, D-01187 Dresden, Germany.

Publication date: January 1, 2008

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