This practice is intended to control the quality and repeatability of the radiological examination of electronic devices for internal discontinuities, extraneous material, missing components, crimped or broken wires, and defective solder joints in cavities, in the encapsulating materials, or the boards. However, this practice is not intended to control the acceptability or quality of the electronic devices imaged. The quality of the radiological examination shall be determined by image quality indicators (IQIs), which shall be manufactured from clear acrylic plastic with steel covers serving as shims, lead spheres, gold or tungsten wires, and lead numbers, and shall be permanently identified with the appropriate IQI number. The IQI shall simulate as closely as possible the device being examined. For example, the IQI shall have a radiographic density or grey level nearest to that of the device being examined. Two IQIs shall be used for each radiograph, with each IQI located at diagonally opposite corners of the film, and the radiographic image free of blemishes. To identify the image, in both radiography and radioscopy, a system of positive identification of the image shall be provided, which may include any or all of the following: the name of examining laboratory, the date, the part number, the serial number, the data code, the view, and whether original or subsequent exposure.