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我院有一台 XG-200mAX 线机,上球管是 RXD-15-30/100旋转阳极 X 线管。该机于77年开始使用,头三年内工作正常,后发现 mA 表指数异常,指示偏高,50mA 档为70mA,100mA 档为130mA。故将大小焦点的降压电阻作了适当的调整,以保持额定的管电流值。使用不久,又出现了 mA 指数不稳定现象:每天工作开始时 mA 指数正常,使用半小时后,
There is a XG-200mAX line machine in our hospital. The upper tube is an RXD-15-30/100 rotating anode X-ray tube. The aircraft was put into use in the year of 77. It worked normally for the first three years. It was found that the index of the mA meter was abnormal and the indication was high. The 50mA gear was 70mA and the 100mA gear was 130mA. Therefore, the size of the focus of the step-down resistor was adjusted to maintain the rated tube current value. In the near future, there has been a renewed instability in the mA index: the mA index is normal at the beginning of each day’s work, and after half an hour of use,