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NCJRS Abstract

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NCJ Number: 210780 Find in a Library
Title: Maintenance of the ENFSI Proficiency Test Program on Identification of GSR by SEM/EDX (GSR2003)
Journal: Journal of Forensic Sciences  Volume:50  Issue:4  Dated:July 2005  Pages:883-886
Author(s): Ludwig Niewoehner Ph.D.; Jan Andrasko Ph.D.; Jan Biegstraaten B.S.; Lawrence Gunaratnam M.Sc.; Sylvia Steffen M.Sc.; Steffen Uhlig Ph.D.
Date Published: July 2005
Page Count: 6
Sponsoring Agency: Council of Europe
F-67075 Strasbourg, France
Grant Number: JAI/2001/OIS/059
Type: Test/Measurement
Format: Article
Language: English
Country: United States of America
Annotation: This report describes some improvements introduced in the most recent proficiency tests on the detection and identification of gunshot residues (GSR) by the European Network of Forensic Science Institutes (ENFSI) Working Group "Firearms," using scanning electron microscopy and energy dispersive x-ray microanalysis (SEM/EDX).
Abstract: Improvements in the current test (GSR2003) were as follows: three-component particles with four different sizes, including sub-mm-particles, were prepared; a thin carbon layer was applied on the silicon substrate that approached "real" GSR samples by using a carbon-containing adhesive tape; and an extensive statistical evaluation of the obtained data was conducted by independent statisticians. This report's description of the materials and methods addresses the preparation of test material, the homogeneity and stability of the test material, the organization of the proficiency test, the laboratory evaluation and data assessment, and the estimation of the method's detection capability. The new sample design facilitates an estimation of the overall method's detection capability. Detection capability was found to be a function of the particle size. As expected, the method's detection capability decreased with a decrease in particle size. To achieve a detection capability of at least 90 percent, the particle size must exceed 1.8 mm. For 1.0 mm particles, the detection capability is only 65 percent at present. The aim of future proficiency tests will be a further optimization of the parameter setting in order to enhance the sensitivity of the method and to harmonize the performance of the GSR investigation in various laboratories. 9 tables, 3 figures, and 17 references
Main Term(s): Police policies and procedures
Index Term(s): Electron microscopy; Europe; Foreign criminal justice research; Forensic sciences; Gunshot residue; Investigative techniques
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