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Friday, December 01, 2006

A Better Liquid-Explosives Detector

Continued from page 1

By Kevin Bullis

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The ICx Nomadics detectors work by sensing minute amounts of vapor: a specially formulated film fluoresces under certain conditions. For peroxide detection, a film starts to glow when it comes in contact with the peroxide vapors. The film coats the inside of a glass tube, through which air is drawn. The glass walls of the tube guide light from the film to a light sensor, which registers changes in light intensity. (In the TNT sensor, TNT vapors encountering an already fluorescing film cause it to darken.)

The company is working with MIT professor of material sciences Yoel Fink to further improve the clarity of the detectors' signal by making it easier to distinguish from background noise. Fink, who has created hollow fibers that can guide light much better than the glass tubes currently used, has also incorporated light detectors directly into fibers. A device that combines these features could "offer a huge simplification in instrumentation, making these almost ubiquitous," Rose says. In the future, soldiers could carry fibers designed to detect a variety of substances. The company is also developing polymers for detecting a variety of toxic industrial chemicals. A bundle of fibers could be used to detect more than one substance at a time.

It remains unknown whether ICx Nomadics's liquid-explosives-detection technology will ultimately result in the federal government lifting restrictions on taking bottled water and other liquids through airport security. "That's up to the TSA," Kelly says.

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Comments

  • Detecting TATP explosives
    iddo on 12/02/2006 at 6:27 AM
    Posts:
    4
    This is not the first technology to be able to identify TATP - this article covers the subject in-depth:
    http://www.tfot.info/content/view/92/
    Rate this comment: 12345
  • TATP in a short per. of time?
    teknix on 12/07/2006 at 10:58 AM
    Posts:
    1
    My question is how is someone going to go on a plane with strong smelling chemicals (acetone and HCl) and use these in a mix without someone noticing it, form TATP in a reasonable amount of time (usually takes 24 hours to form enough to do any damage), and then filter the solid from the liquid solution and dry it (usually takes another 24 hours) all in the few hours they are on a plane? Also if they say TATP that means it has to be formed at low temperature to obtain the tricyclo isomer so they are going to need an ice bath or refrigerator. If they do this reaction at room temperature it will form faster in a few hours but you are getting DADP which is a dicyclo isomer and much more unstable, but this still doesn’t change the fact that it needs dried before it can be used as an explosive.
    Rate this comment: 12345
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