发明名称 |
X-RAY FLUORESCENCE IMAGING OF ELEMENTS |
摘要 |
X-RAY FLUORESCENCE IMAGING OF ELEMENTS A system for detecting the presence of known materials in a body or container. 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 detector 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 container 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 surfaces of the crystals disposed at different Bragg angles to simultaneously detect the presence of a selected group of materials. |
申请公布号 |
CA2027150(A1) |
申请公布日期 |
1991.04.20 |
申请号 |
CA19902027150 |
申请日期 |
1990.10.09 |
申请人 |
HUGHES AIRCRAFT COMPANY |
发明人 |
WEBSTER, JACKIE R.;PEARSON, KEITH V.;CHANG, DAVID B.;MOISE, NORTON L.;VALI, VICTOR |
分类号 |
G01N23/207;G01N23/223;G01N33/00;(IPC1-7):G01N23/223 |
主分类号 |
G01N23/207 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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