| 摘要 |
PURPOSE: To provide an ionization chamber type X-ray detector using double- side signal electrode plates, easy to be assembled and machined without the lowering of practical performance and providing desirable CT images with high diagnostic ability. CONSTITUTION: A pair of electrode-holding plates 1 formed out of an insulating material with plural grooves 4 of the same pitch radially formed on the opposed surface are disposed parallelly in a detector container (case) with ionized gas such as high pressure xenon gas filled inside. A high-voltage electrode plate 3 formed out of one metal plate, and a double-side electrode plate 2 of a multi- layer structure with an insulating layer 22 and a surface electrode layer 23 laminated on both faces of a center metal plate 21 are alternately inserted in the grooves 4 and fixed to one side wall with an adhesive 5. In the ionization chamber type X-ray detector of such constitution, the plate thickness of the center metal plate of the double-side electrode plate 2 is set to a thickness required to prevent the influence of crosstalk on an adjacent channel caused by X-rays, and the plate thickness of the high-voltage electrode plate 3 is set to the same thickness as the whole plate thickness of the double-side electrode plate 2.
|
