Posted on 08/31/2008 1:16:57 PM PDT by neverdem
RedXDefense of Rockville, Maryland has recently developed a portable kit that could provide a quick and simple visual diagnostic for detecting plastic explosives favored by terrorists. The device, which was designed to be used by in security checkpoints and under harsh conditions, is currently undergoing field tests in Iraq.
While most explosives-detection methods look for vapors coming from the explosive metrical, the plastic explosives often used by terrorists such as like Richard Reid (the notorious “shoe bomber”) are not very volatile, and technologies for their detection usually require dislodging the explosive before running a chemical analysis. Unfortunately, these systems are not portable and are not always easy to use.
William Trogler, a chemistry professor at the University of California, San Diego, who developed the technology behind the device developed a sprayable polymer that fluoresces blue-green under ultraviolet (UV) light, unless in the presence of explosive molecules, including PETN and TNT. When the polymer is sprayed on a surface and examined under UV light, explosives appear as black spots. The polymer is described in a recent issue of the Journal of Materials Chemistry.
This new detection kit, called the XPak, consists of a plastic viewing box and a removable baton. First, the soldier or police officer using the device rolls the paper-covered baton over the surface to be tested or has the subject grip the roller as it is placed inside the viewing box, where it is then sprayed with the luminescent polymer. The user then looks through the viewfinder using UV light. If there are no explosives present, the baton will look entirely blue. However, if there are traces of explosives, even as small as a few picograms, black spots will appear visible to the naked eye, allowing for intuitive, on the spot analysis without the overhead of image-analysis software...
(Excerpt) Read more at thefutureofthings.com ...
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