Patent ID: 7397894

Claim:
A transmission imager, comprising: a radiation source for radiating radioactive rays from a target; a radiation detector; and a specimen table provided between the target and the radiation detector for having a specimen to be examined placed thereon, wherein the radiation source generates X-rays, the X-rays being generated by the target upon receiving cathode rays emitted from a cathode, wherein a range of the X-rays generated is greater than an effective radiation width; wherein the radiation detector is a combination of two, first and second, radiation detectors for detecting transmitted X-rays, the first radiation detector arranged with a detecting surface at a center of the first radiation detector extending substantially at a right angle to a first reference axis which extends from said center to the target, and the second radiation detector arranged with a detecting surface at a center of the second radiation detector extending substantially at a right angle to a second reference axis which extends from said center to the target, the first radiation detector arranged to be moved to and from the target by the action of a driving mechanism and thus positioned further from the target than the second radiation detector, and wherein the radiation source is specifically arranged in relation to the two, first and second, radiation detectors so that its target comes at an angle to face a cathode which is disposed closer to the second radiation detector.