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Dual energy scanning beam laminographic x-radiography

United States Patent

*** EXPIRED ***
April 21, 1998
View the Complete Patent at the US Patent & Trademark Office
Thomas Jefferson National Accelerator Facility - Visit the Technology Review Committee Website
A multiple x-ray energy level imaging system includes a scanning x-ray beam and two detector design having a first low x-ray energy sensitive detector and a second high x-ray energy sensitive detector. The low x-ray energy detector is placed next to or in front of the high x-ray energy detector. The low energy sensitive detector has small stopping power for x-rays. The lower energy x-rays are absorbed and converted into electrical signals while the majority of the higher energy x-rays pass through undetected. The high energy sensitive detector has a large stopping power for x-rays as well as it having a filter placed between it and the object to absorb the lower energy x-rays. In a second embodiment; a single energy sensitive detector is provided which provides an output signal proportional to the amount of energy in each individual x-ray it absorbed. It can then have an electronic threshold or thresholds set to select two or more energy ranges for the images. By having multiple detectors located at different positions, a dual energy laminography system is possible.
Majewski; Stanislaw (Grafton, VA), Wojcik; Randolph F. (Yorktown, VA)
Southeastern Universities Research Association, Inc. (Newport News, VA)
08/ 781,722
January 10, 1997
GOVERNMENT RIGHTS The United States may have certain rights to this invention under management and operating Contract DE-AC05-84 ER 40150 from the United States Department of Energy.