Forensic Analysis Methodology for Thermal and Chemical Characterization of Homemade Explosives

Published

November 24, 2013

Author(s)

Ashot Nazarian, Cary Presser

Abstract

Forensic identification of homemade explosives is critical for determining the origin of the explosive materials and precursors, and formulation procedures. Normally, the forensic examination of the pre- and post-blast physical evidence lacks specificity for homemade-explosive identification. The focus of this investigation was to use a novel measurement technique, referred to as the laser-driven thermal reactor, to obtain the thermal/chemical signatures of homemade-explosive precursor materials. Specifically, nitromethane and ammonium nitrate were studied under a variety of operating conditions and protocols. Results indicate that liquid-fuel saturation of the internal pores of a solid particle oxidizer appear to be a limiting parameter for the total specific heat release during exothermic processes. Results also indicate that the thermal signatures of these materials are dependent on the sample mass and laser heating rate, for which this dependency may not be detectable by other commercially available thermal analysis techniques. This study has demonstrated that the laser-driven thermal reactor can be a useful diagnostic tool for characterizing the thermal and chemical behavior of trace amounts of homemade-explosive materials.

Citation

Thermochimica ACTA

Volume

576

Issue

1

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.tca.2013.10.036

Local Download

Keywords

Ammonium nitrate, Homemade explosives, Forensic analysis, Laser-driven thermal reactor, Nitromethane, Thermal/chemical signatures

Citation

Nazarian, A. and Presser, C. (2013), Forensic Analysis Methodology for Thermal and Chemical Characterization of Homemade Explosives, Thermochimica ACTA, [online], https://doi.org/10.1016/j.tca.2013.10.036, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=913871 (Accessed April 24, 2024)