Radio photo detection refers to a non -destructive detection method to detect materials and workpieces with X -ray or gamma rays to detect materials and workpieces, and use ray camera film as a record medium and display method. Radio photo detection is the many characteristics of X -rays and gamma rays (such as light sensitivity), and by observing records (sensitive) on the ray photography film (negative) Attenuation changes, to determine whether the inspection materials and workpieces are defective, so as to evaluate their quality and use value without damage or damage to the inspection materials and workpieces.