ASTM E1742-18 establishes the minimum requirements for the radiographic examination of metallic and nonmetallic materials. The criteria for the radiographic examination in the specification are applicable to all types of metallic and nonmetallic materials. The requirements expressed in the specification are intended to control the quality of the radiographic images and are not intended to establish the acceptance criteria for parts and materials. The specification doesn’t cover the safety precautions that should be taken when performing the inspection.