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F_(34)—Ⅰ型X线深部治疗机治疗时,操作者发现毫安表突然大幅度(上下限之间超过3mA)摆动了几下,过些时候又如此重复。放出病人,换上6Pb铅滤过板、降低机头试开,能正常运转;约3分钟后,忽听见“唧”地一声,接着毫安表指针就剧烈摆动,尔后又恢复常态。可听出声音发自主控制台。打开蒙皮,目检未见异常。再开机试走5分钟,亦无异常,切断高压约3分钟
In the treatment of the F_(34)-I X-ray deep unit, the operator found that the milliammeter suddenly oscillated significantly (more than 3mA between the upper and lower limits) and then repeated several times. Release the patient, replace it with a 6Pb lead filter plate, lower the head and try it on, and it will work normally; after about 3 minutes, a “bang” sound is heard, then the milliammeter pointer oscillates violently and resumes normal. You can hear the voice of your own console. Skin was opened and no visual abnormalities were found. Try to walk for 5 minutes after booting, and there is no abnormality. Cut off the high pressure for about 3 minutes.