Explosive detection method and apparatus using selective gamma r

Details Explosive detection method and apparatus using selective gamma r Explosive detection method and apparatus using selective gamma r

1991-11-13

1992-10-27

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Specific application

Absorption

25039004, 376159, 324307, G01N 2306, G01N 3322

Patent

active

051596172

ABSTRACT:
An apparatus and method for determining the presence of certain elements or compounds within an object, wherein the object under examination contains both nuclei of a first type which exhibit nuclear magnetic resonance and nuclei of a second type which exhibit nuclear quadrupolar resonance. The apparatus and method involve subjecting the object to a magnetic field and to a radiation beam whose characteristics in the presence of a magnetic field and in the absence of a magnetic field can be measured. The radiation transmission and/or absorption "fingerprint" of a particular substance is experimentally determined and recorded in the presence of a magnetic field calculated to optimize a cross coupling between nuclei of the first (NMR) type and nuclei of the second (NQR) type. This reference is then utilized later as a basis on which to identify an unknown compound exhibiting the same radiation absorption and/or transmission characteristics in response to the same or similar magnetic field intensity. Specific types of radiation and specific magnetic field intensities are pre-selected as optimizing the detectability of specific NMR/NQR element pairs.

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