A continuously operating, scanning X-ray machine is being developed or landmine detection using backscattered X-rays. The source operates at 130 kV and 650 mA. The X-rays are formed by electrons striking a high Z target. Target shape is an approximate 5 cm wide by 210 cm long racetrack. The electron beam is scanned across this target with electromagnets. There are 105 (1-cm by 1-cm) collimators in each leg of the racetrack for a total of 210 collimators. The source is moved in the forward direction at 3 mi/h. The forward velocity and collimator spacing are such that a grid of collimated X-rays are projected at normal incidence to the soil. The spacing between the collimators and the ground results in a 2-cm by 2-cm X-ray pixel on the ground. A unique detector arrangement of collimated and uncollimated detectors allows surface features to be recognized and removed, leaving an image of a buried landmine. Another detector monitors the uncollimated X-ray output and is used to normalize the source output. The mine detector is being prepared for an advanced technology demonstration.
Mobile, scanning X-ray source for mine detection using backscattered X-rays
1997
8 Seiten, 5 Quellen
Aufsatz (Konferenz)
Englisch
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