Sep 12 – 17, 2010
CERN
Europe/Zurich timezone
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14N Nuclear Quadrupole Resonance of TNT

Not scheduled
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

CH - 1211 Geneva 23 Switzerland
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POSTER Resonance Methods

Summary

Nuclear Quadrupole Resonance (NQR) is one of the promising techniques for drugs and explosives detection in security applications. Another field emerging very recently is the development of fast methods to nondestructively determine counterfeit drugs. NQR's main advantage over most techniques is specificity, as the sample NQR frequency is almost unique, defined only by the quadrupole moment of the nucleus under observation and the sample specific electric field gradients. Unfortunately, the technique sensitivity is often low, requiring long experiemntal times. This is especially true for a very desirable nucleus 14N. Here I present three techniques used to increase 14N sensitivity which were applied to the detection of the explosive TNT:
 polarization transfer from 1H to 14N [1]
 the use of multipulse sequence spin-lock spin-echo [2], and
 the super-Q detection [3].
Whereas these techniques are very well known in the NMR/NQR community, they present some pecuiliarities when applied to TNT which are related to the occurence of several closely spaced resonance lines.

Primary author

A. Gregorovič (Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenija)

Co-authors

J Lužnik (Institute for Mechanics, Physics and Mathematics, Jadranska 19, 1000 Ljubljana, Slovenija) J Pirnat (Institute for Mechanics, Physics and Mathematics, Jadranska 19, 1000 Ljubljana, Slovenija) T Apih (Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenija) Z Trontelj (Institute for Mechanics, Physics and Mathematics, Jadranska 19, 1000 Ljubljana, Slovenija)

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