19 October 2011 Discrimination of new and aged post-blast explosives residues
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Abstract
The main objective of this project is to study the difference between aged and un-aged post-blast residues and nonblasted explosives. Sand from the post-blast scenes was subjected to accelerated aging (temperature, light and addition of water) over a period of 20 weeks. The samples were aged as matrix-free pure compounds and as post-blast sand. Several explosive materials were detonated over sand-filled containers and selected residues were separated and detected with HPLC/UV. Separation and detection methods using GC/MS and LC/UV were developed. This screening study of aged post-blast residues revealed that most of the residues reached low or undetectable concentration within a period of eight weeks of aging. This degradation rate theory can be applied both for the temperature- and UV-aged samples. The half-life degradation time (t1/2) was estimated and most of the detected residues reach t1/2 within five weeks. No trends with significant difference can be seen between the UV- and temperature-aged samples.
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Helena Hansson, Helena Hansson, Anders Elfving, Anders Elfving, Dennis Menning, Dennis Menning, Hans G. Önnerud, Hans G. Önnerud, Erik Holmgren, Erik Holmgren, Mona Brantlind, Mona Brantlind, Ulla Hedebrant, Ulla Hedebrant, Henric Östmark, Henric Östmark, Rose-Marie Karlsson, Rose-Marie Karlsson, Patrick Goede, Patrick Goede, } "Discrimination of new and aged post-blast explosives residues", Proc. SPIE 8189, Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security, 818903 (19 October 2011); doi: 10.1117/12.898183; https://doi.org/10.1117/12.898183
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