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发表于 2018-3-28 16:13:30
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可参照E747的7.3:
7.3 Method for Other Materials:
7.3.1 For materials not herein covered, IQI’s of the same materials, or any other material, may be used if the following requirements are met. Two blocks of equal thickness, one of the material to be examined (production material) and one of the IQI material, shall be radiographed on one film by one exposure at the lowest energy level to be used for production. Transmission densitometer measurements of the radiographic image of each material shall be made. The density of each image shall be between 2.0 and 4.0. If the image density of the IQI material is within 1.00 to 1.15 times (−0 % to + 15 %) the image density of the production material, IQI’s made of that IQI material may be used in radiography of that production material. The percentage figure is based on the radiographic density of the IQI material.
7.3.2 It shall always be permissible to use IQI’s of similar composition as the material being examined.
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