| 摘要 |
PURPOSE:To arrest magnetic noises caused by an external magnetic field by a method wherein when positive and negative electrodes of a semiconductor radioactive rays detecting element which is fitted on a mount are connected to a sense circuit using a conductive film, the conductive film is wound in spiral on the surface of an insulating plate which is connected to the mount. CONSTITUTION:A semiconductor radioactive rays detecting element 31 provided with positive and negative electrodes on both sides of the surface and the reverse is fitted on a mount 32 shaped approximately in ring which is integratedly formed with an insulating plate 33 for leading out the electrodes. In the following, electrodes outgoing lines 341 and 342 respectively in positive and negative are connected to the electrodes of the element 31 and led out along the insulating plate 33 to a sense circuit provided outside. In this case, an Al film of less than 40mum thick is used for the outgoing lines 341 and 342 and wound in spiral. Materials which are small in X-ray attenuation, such as acrylic resin or polyester resin, is used for the mount 32 and the insulating plate 33. In such a manner, when the materials are used for an X-ray exposure control device, no shadow is produced on the film. |
