X-ray or gamma ray systems or devices – Specific application – Diffraction – reflection – or scattering analysis
Patent
1991-01-02
1993-09-21
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Diffraction, reflection, or scattering analysis
378 86, 378 88, 378 89, G01N 23201
Patent
active
052475611
ABSTRACT:
The invention provides an inspection system for closed containers, such as luggage, which applies radiant energy, such as x-rays, to a container and receives energy which is scattered, such as by Compton scattering, by objects in the container. The received energy is measured and a three-dimensional image of the objects in the container is constructed. The container may be moved relative to a fan-shaped primary x-ray beam, which illuminates a single slice of the container at a time. For example, the container may be moved by a conveyer belt, or, the container may be held stationary while the x-ray tube may comprise a steerable beam. A plurality of collimated x-ray sensors may receive energy which is scattered, at a fixed angle for each sensor, and transmits those measurements to a processor which reconstructs the three-dimensional image and displays that image for an operator. The processor may also search for, and raise an alarm if it detects, a sufficient volume of material with a mass density indicative of an explosive.
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Edward C. Greenwald & Chester F. Poranski, Jr., Advancements in X-Ray Backscatter Tomography (for 1991 ASNT Spring Conference-Nondestructive Characterization for Advanced Technologies), Mar. 18, 1991, pp. 81-81.
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