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New Guide for the Forensic Analysis of Geological Materials by Scanning Electron Microscopy and Energy Dispersive X-Ray Spectrometry
1. Scope
1.1 This guide covers recommended techniques and procedures for the use of Scanning Electron Microscopy/Energy Dispersive X-ray Spectrometry (SEM/EDS) for the forensic analysis of geological materials to include soils, rocks, sediments, and materials derived from them (for example, concrete).
1.2 This standard describes options for sample handling and preparation of specimens, instrument operating conditions, spectral and image data collection, evaluation of data quality, interpretation of EDS spectra for the identification of inorganic geological materials, documentation of morphology by SEM imaging, and criteria for sample comparison.
Keywords
particle analysis; mineral identification; elemental composition
Rationale
Currently there are no standards that specifically address forensic applications of SEM analysis of geological material. Analysts within forensic laboratories can use this information to create and validate SEM-EDX practices and methods for analyzing and comparing samples of geological material.
