以钛合金阶梯试块为对象, 以底片像质计灵敏度和黑度为评估指标, 对相同感光度的双胶片和增感屏的不同组合方式进行研究。结果表明:按航标HB/Z60 《X射线照相检验》中的规定, 对最大厚度小于42 mm的零部件,若被检测零件的最大厚度与最小厚度的比值小于5.5, 胶片放置可采用MX125MX125的组合方式; 若被检测零件的最大厚度与最小厚度的比值小于3.0, 胶片放置可采用MX125、MX125和AA400AA400的组合方式。

In the present work, with the film sensitivity and film density as evaluation parameters, the combination patterns of double-film technology with metal intensifying screen were studied with titanium alloy step blocks. The results show that in accordance with the regulation of HB/Z60《Radiographic Inspection》, for the parts of thickness being less than 42mm :if the maximum and minimum thickness ration of detected part is less than 5.5,the combination pattern of MX125MX125 can be used, if the ration is less than 3.0, the combination pattern of MX125,MX125 and AA400AA400 can be used.