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本文报告了医用诊断Ｘ射线透视机受检者入射空气比释动能率的测量结果。在１５９台被测机中有１９台超过了国家规定的５０ｍＧｙ·ｍｉｎ－１标准，占１１．９％。超标原因与Ｘ射线机球管窗口处的固有过滤板厚度不足等因素有关。
This article reports the measurement of kerma rate of incident air from a medical diagnostic X-ray machine. 19 of the 159 tested machines surpassed the national standard of 50mGy · min-1, accounting for 11.9%. Exceeding causes and X-ray tube window at the inherent filter board thickness and other factors.