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本文报道了福建省内正在使用的５０至９０年代１３６台国产原装ｘ射线机防护性能的比较。发现ｘ射线机防护性能整机合格率正在逐渐提高，９０年代机的漏射线、立位和２００ｍＡ以上机的卧位透视防护区照射量率的测值均显著地低于５０～８０年代机，说明国产ｘ射线机防护性能正在完善。但９０年代机整机不合格申仍有２２．１％，因此应特别重视９０年代机防护性能达标问题。
This article reports the comparison of the protective performance of the 136 indigenous x-ray machines currently in use in Fujian Province from the 1950s to the 1990s. It is found that the passing rate of x-ray machine protection performance is gradually increasing. In the 90’s, the radiation leakage rate, standing position and the irradiation dose of the over-depth perspective protective zone of 200mA and above were significantly lower than those of the 50’s and 80’s, Description of domestic x-ray machine protection performance is improving. However, in the 1990s, there were still 22.1% of the total unqualified machines, so special attention should be paid to the issue of meeting the standards of 90-degree machine protection performance.