ENFSI proficiency test program on identifcation of GSR by SEM/EDX
Niewoehner, L
Forensic Science Institute of the Bundeskriminalamt, BKA, D-65173 Wiesbaden, Germany.

Wenz, HW
Forensic Science Institute of the Bundeskriminalamt, BKA, D-65173 Wiesbaden, Germany.

Andrasko, J
National Laboratory of Forensic Science, SKL, S-58194 Linkoeping, Sweden.

Beijer, R
Natherlands Forensic Institute, NFI, NL-2288 GD Rijswijk, The Netherlands.

Gunaratnam, L
National Bureau of Investigation, NBI, PL 285, FIN-01301 Vantaa, Finland.


Abstract
Within the framework of the ENFSI Expert Working Group “Firearms,” a proficiency test on the detection and identification of GSR by SEM/EDX was organized and performed. The test material was designed by the Bundeskriminalamt and manufactured to order by an external company for SEM accessories. The participating laboratories were requested to determine the total number of PbSbBa-containing particles on the test samples following their own laboratory specific methods of automated GSR particle search and detection by SEM/EDX. Two similar samples with synthetic GSR particles were dispatched to all participants in order to gain additional information on systematic errors within the obtained results (split-level study), whereas one sample was supplied only with PbSbBa particles, and the second one was additionally contaminated with some environmental particles. This report summarizes the results of the study as well as a statistical evaluation and comparison with previous studies.

Keywords:
ENFSI, European Network of Forensic Science Institutes, forensic science, GSR, gunshot residue, ISO 5725, proficiency testing, scanning electron microscopy, SEM/EDX, statistical analyses, Youden, z-scores

Paper ID: JFS2002396_484

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Author Niewoehner L, Wenz HW, Andrasko J, Beijer R, Gunaratnam L Title ENFSI proficiency test program on identifcation of GSR by SEM/EDX Symposium , Committee on