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NCJ Number: 77118 Add to Shopping cart Find in a Library
Title: Gunshot Residue Workshops - Final Report
Author(s): A S Colborn; J A Brown
Corporate Author: McCrone Research Institute
United States of America
Date Published: 1979
Page Count: 59
Sponsoring Agency: McCrone Research Institute
Chicago, IL 60616
US Dept of Justice

US Dept of Justice NIJ Pub
Washington, DC 20531
Grant Number: 78-NI-AX-0109
Type: Instructional Material
Format: Document
Language: English
Country: United States of America
Annotation: This report describes a new and accurate method for the detection of gunshot residue (GSR) and the organization and content of workshops which taught the method to forensic scientists.
Abstract: The scanning electron microscope/energy dispersive X-ray analyzer (SEM/EDXRA) method, recently developed by the Aerospace Corporation with the support of LEAA, depends upon particle-by-particle analysis of GSR removed from the hands with sticky tape. GSR is composed of micrometer-sized particles which are physically characteristic of their mode of formation as well as chemically related to their source materials. Each of these particles can be visualized and sized with the SEM and analyzed for elements heavier than sodium with the EDXRA. The method was taught to 31 scientists from 28 laboratories in 5-day workshops in 1979. These workshops consisted of lectures, discussion, and laboratory sessions on GSR characteristics, on comparison of light and scanning electron microscopy, on theory of electron optics and SEM, and on practical instrumental details. Also included were the theory and practice of X-ray analysis; GSR sampling procedure; SEM analysis of particles; and daily, hands-on experience with SEM. Pre- and postworkshop written tests indicated that the participants gained the basic technical knowledge required. Most participants felt that a great potential for SEM use existed in their laboratories since it can also be used for many other types of trace evidence. Footnotes and a 10-item reference list are included. Appendixes contain a 63-item bibliography on forensic applications of the SEM, papers on the method, a list of participants, energy dispersive X-ray charts, and sample instruction sheets and course materials. For a report on the validity of scanning electron microscopy evidence, see NCJ 77119.
Index Term(s): Course materials; Electron microscopy; Gunshot residue; Trace evidence; Workshops and seminars; X-Ray Technology
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