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Explosive detectors
- To: RADSAFE <radsafe@romulus.ehs.uiuc.edu> (Return requested)
- Subject: Explosive detectors
- From: "Merritt, Kim D 7714 M" <KDMERRI@sandia.gov>
- Date: 20 Jun 1996 08:25:30 -0700
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I posted some information yesterday regarding IMS type explosive detectors
without giving the whole story so here goes. Warm air is blown by the
person, this causes the contaminants to be released. The air is then drawn
into the IMS where the radioactive source ionizes it. It is the
accelerated down a heated drift tube onto a Farady plate detectors where the
output is given in voltage and current. This is relative to the time it
took to accelerate that particular ion through he drift tube. The time is
indicative of the molecule size and is repeatable. So as long as you have a
baseline measurement of the molecule you are looking for at the barometric
pressure and humidity you are working in you can analyze for almost
anything. Another sample collection method is a small vacuum with a sample
filter attached to it . The filter is analyzed the same way as above.
Kim Merritt, RRPT
Sandia Labs
kdmerri@sandia.gov
Standard disclaimers apply.