Detection of ammonium nitrate inside vehicles by Nuclear Quadrupole Resonance

摘要

Nuclear quadrupole resonance (NQR) has been demonstrated for the detection of explosives in a number of potential applications, including baggage screening, mail screening and landmine detection. A further highly desirable application concerns the detection of explosives concealed within a vehicle, which from the point of view of RP penetration can be considered as a large metal box with holes in it. A perceived problem of the technology is its reduced effectiveness in detecting materials that are enclosed by metal due to the poor penetration of radio-frequency (RF) magnetic fields. Thus it has generally been thought that such vehicle bodies would make NQR detection extremely difficult.