Automated mapping of explosives particles in composition C-4 fingerprints

Journal of Forensic Sciences
Jennifer R VerkouterenInho Cho

Abstract

A method is described to perform automated mapping of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) particles in C-4 fingerprints. The method employs polarized light microscopy and image analysis to map the entire fingerprint and the distribution of RDX particles. This method can be used to evaluate a large number of fingerprints to aid in the development of threat libraries that can be used to determine performance requirements of explosive trace detectors. A series of 50 C-4 fingerprints were characterized, and results show that the number of particles varies significantly from print to print, and within a print. The particle size distributions can be used to estimate the mass of RDX in the fingerprint. These estimates were found to be within +/-26% relative of the results obtained from dissolution gas chromatography/micro-electron capture detection for four of six prints, which is quite encouraging for a particle counting approach. By evaluating the average mass and frequency of particles with respect to size for this series of fingerprints, we conclude that particles 10-20 microm in diameter could be targeted to improve detection of traces of C-4 explosives.

References

Nov 24, 2004·Analytical Chemistry·G A Eiceman, J A Stone
Feb 24, 2007·Journal of Forensic Sciences·Jennifer R Verkouteren

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Citations

May 3, 2011·Analytical Chemistry·T A BrettellJ R Almirall
Mar 20, 2012·The Journal of Physical Chemistry. a·Roderick R KunzAugustus W Fountain
May 26, 2017·Applied Spectroscopy·John J BradyBarry T Smith
Jan 1, 2014·International Journal for Ion Mobility Spectrometry : Official Publication of the International Society for Ion Mobility Spectrometry·Jessica L StaymatesGreg Gillen
Mar 8, 2019·Forensic Science International : Synergy·Lauryn E DeGreeffKevin J Johnson
Oct 9, 2021·Analytical and Bioanalytical Chemistry·Amir LifshitzShimshon Belkin

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