Radiography Radiography is the use of certain types of electromagnetic radiation—usually ionizing—to view objects. The use of non-ionizing radiations (visible light and ultraviolet light) to view objects is best viewed as a normal “optical” method (e.g., light microscope). The modification of an object through the use of ionizing radiation is not radiography, depending on the nature of the object and the intended outcome it can be radiotherapy, food irradation, radiation processing.