| 摘要 |
An X-ray device comprising an X- ray tube (21); a shutter (29) which is movable between an open position in which X-rays from the X-ray tube (21) may be directed onto material (28) to be tested and a closed position in which the said X-rays are prevented from being so directed; an X-ray detector (24) for detecting fluorescent X-rays; means (22) movable with the shutter (29) for receiving X-rays from the X-ray tube (21) and for directing fluorescent X-rays onto the X-ray detector (24) only when the shutter (29) is closed; and correction means connected to said X-ray detector (24) for automatically correcting a change in the X-rays produced by the X-ray tube (21). <IMAGE> |
