METAL SHIELD ALARM IN A NUCLEAR QUADRUPOLE RESONANCE/X-RAY CONTRABAND DETECTION SYSTEM
First Claim
1. A detection system to scan an object comprising (a) at least one pair of sensors to detect nuclear quadrupole resonance in the object, (b) an X-ray system to determine the presence of metal in the object, and (c) an alarm that is activated when the area of metal in the object, as determined by resonance frequency shifts of the sensors, exceeds the area of the metal in the object, as determined by X-ray, by at least a pre-selected amount.
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Abstract
This invention relates to a combined nuclear quadrupole resonance and X-ray contraband detection system with a metal shield alarm that is activated when the area of the metal in the object being scanned as determined by the resonance frequency shifts of the NQR sensors exceeds the area of the metal in the object being scanned as determined by X-rays by an amount sufficient to shield contraband.
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Citations
24 Claims
- 1. A detection system to scan an object comprising (a) at least one pair of sensors to detect nuclear quadrupole resonance in the object, (b) an X-ray system to determine the presence of metal in the object, and (c) an alarm that is activated when the area of metal in the object, as determined by resonance frequency shifts of the sensors, exceeds the area of the metal in the object, as determined by X-ray, by at least a pre-selected amount.
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13. A method for scanning an object to determine the presence therein of a target substance shielded by metal, comprising:
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(a) scanning the object with X-rays to determine the area of metal contained in the object;
(b) scanning the object to determine the area of metal contained in the object as measured by the resonance frequency shifts of at least one pair of nuclear quadrupole resonance sensors;
(c) comparing the size of the area of metal determined in step (a) with the size of the area determined in step (b); and
(d) activating. an alarm if the area determined in step (b) exceeds the area determined in step (a) by at least a pre-selected amount. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification