Detection of Explosive and Narcotics by Low Power Large Sample Volume Nuclear Quadrupole Resonance (NQR).
Patent application, filed 6 Jul 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention is directed generally to a method and an improved system for detecting nitrogenous explosives or narcotics improved system for detecting nitrogenous explosives or narcotics by nuclear quadrupole resonance NQR, and more specifically, to a lower power method for detecting those materials. In order to limit the unrestricted flow of explosives and narcotics, it is designed to detect sub-kilogram quantities of those materials in monitoring stations. Most military explosives and narcotics share common features they are crystalline solids containing nitrogen. Presently, the explosive detections system and methods cannot reliably detect sub-kilogram quantities of military explosives against a background of more benign materials. In conventional vapor-based systems, dynamites and contaminated explosives may be detected. However, military explosives such as hexhydro-1,3,5-trinitro-s-triazene commonly referred to as RDX and 2,2-bisNITROXYMETHYL-1,3-propanediol, dinitrate commonly referred to as PETN are not reliably detected by the conventional vapor base systems especially when countermeasures are taken to reduce the effluent vapor and particles.
- Ammunition and Explosives