Final answer:
The minimum distance for the safe light to avoid fogging of the radiograph is around 1.2 meters (or 1.22 meters).
Step-by-step explanation:
The minimum distance that the safe light should be positioned above the processor shelf to avoid fogging of the radiograph depends on the specific recommendations provided by the manufacturer of the safe light. However, it is generally recommended to have a distance of at least 1.2 meters (or 1.22 meters) between the safe light and the processor shelf.