| 摘要 |
In the new and improved radiation apparatus disclosed herein for inspecting tubular goods, a radiation detector is coaxially positioned within a tubular member being axially translated along a selected inspection axis for receiving radiation from a radiation emitter facing the detector and rotating around the exterior of the tubular member. In the preferred embodiment disclosed herein, a unique radiation-attenuating device or shutter is cooperatively arranged to be normally interposed between the radiation emitter and the radiation detector to at least reduce the intensity of radiation imposed on the detector when a tubular member is not being inspected. The shutter is moved by selectively-operated controls to a second position as a tubular member that is to be inspected is placed between the radiation emitter and detector. In practicing the methods of the present invention with the disclosed apparatus, the shutter is uniquely arranged to cooperate with the detector circuitry for developing a comparison signal when the shutter is interposed between the radiation emitter and detector. The accuracy of this comparison signal is further assured by providing one or more clamping devices which are uniquely arranged for securing the radiation detector in a selected position when the comparison signal is developed.
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