エックス線管陽極の熱膨張による焦点移動の解析

概要

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The temperature of a diagnostic X-ray tube target which is loaded continuously for a long time rises gradually. A tungsten target and its molybdenum rotation shaft expand with heat, so that the focal spot on the target shifts slightly in the direction parallel with the X-ray tube axis. This movement is the subject of this paper. The changed values of the focal spot position due to thermal expansion can be detected by magnification radiography of the focal spot, and confirmed by measuring variations in the total number of photons included in the X-ray spectrum curve. The distances moved between the position of a cold focal spot before loading the X-ray tube and that of a hot focal spot after loading the X-ray tube in various ways fell in most cases in the range of about 100 to 300 μm.
公益社団法人日本放射線技術学会の論文
1989-01-01