Interlaboratory Comparison of Gunshot Residue Analysis

Phuritpach Nantasitangkool, Nitiphat Kittirakshakula, Wanna Watcharayotinkul, Worapot Prongmanee, Umaporn Lamdab, Siripassorn Sukhkhawuttigit, Hathaichanok Muenkla, Nalin Ratnarathorn, Rung Kumpoo, Nakarin Sihabunmak, Zenith Samransamruadkit

Abstract

The investigation of Gunshot Residue (GSR) in Forensic science was carried out by Scanning Electron Microscope (SEM) energy-dispersive x-ray spectroscopy (EDS) and Inductively Coupled Plasma - Optical Emission Spectrometer (ICP-OES). These techniques are not widely used in Thailand. However, the commercial laboratory (CL), Central Institute of Forensic Science (CIFS), and the Royal Thai Police (RTP) attempt to develop these techniques to promote novel ways for GSR analysis. Also, the standard measurement was a crucial requirement in ISO/IEC 17025 quality standard. As a part of quality assurance, proficiency testing and interlaboratory measurement are important criteria in technical requirements. Therefore, the preliminary design of GSR analysis for interlaboratory in Thailand was developed. The quality control sample (QC-sample) was prepared by collecting GSR from the right-hand’s volunteer after shooting. The comparison of GSR analysis between the commercial laboratory and Royal Thai Police for SEM technique and between Central Institute of Forensic Science (CIFS) and the Royal Thai Police for ICP-OES technique. This research was then compared by a paired t-test at the 95 % confidence level. The results indicated the efficiency to detect GSR under the same condition between the commercial laboratory and Royal Thai Police and Central Institute of Forensic Science (CIFS) and the Royal Thai Police are similar.

Keywords

Gunshot Residue (GSR), Scanning Electron Microscope (SEM), Inductively Coupled Plasma - Optical Emission Spectrometer (ICP-OES), Quality control sample, ISO 17025, ISO 17043, Interlaboratory.

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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