G - Physics – 01 – N
Patent
G - Physics
01
N
358/12, 358/8
G01N 23/223 (2006.01) G01N 23/207 (2006.01) G01N 33/00 (2006.01)
Patent
CA 2027150
X-RAY FLUORESCENCE IMAGING OF ELEMENTS ABSTRACT A system for detecting the presence of known materials in a body or contain- er. The system incorporates a gamma or X-ray source for irradiating the body with gamma rays to produce X-ray fluorescence of materials contained therein. A direc- tionally discriminate X-ray detector is positioned to intercept X-rays emitted from the body and is adapted to pass only those X-rays having a predetermined wavelength and incident from a specific direction that are characteristic of a material of interest contained in the body. The detector includes a dislocation free single crystal having substantially parallel input and output surfaces. A second crystal aligned parallel to the first crystal may be disposed at a position offset from the first crystal to receive the X-rays transmitted by the first crystal in order to discriminate between materials fluorescing within the body. In a specific embodiment of the invention, the first de- tector comprises an elongated crystal which pass X-rays in accordance with the Bor- rmann effect. A plurality of the crystals are arranged in a linear array and the con- tainer is either scanned with the array or the container passed linearly past the array. The detected X-rays are measured in intensity and the data is processed by suitable data processor to generate a video image indicative of the presence and shape of the specific materials for which the system is adapted. In yet another specific embodi- ment of the invention, a plurality of such arrays can be arranged with the input sur- faces of the crystals disposed at different Bragg angles to simultaneously detect the presence of a selected group of materials.
Chang David B.
Moise Norton L.
Pearson Keith V.
Vali Victor
Webster Jackie R.
Chang David B.
Hughes Aircraft Company
Moise Norton L.
Pearson Keith V.
Sim & Mcburney
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