Which of the listed materials is primarily tested using Radiographic Testing?

Radiographic Testing is most commonly employed for inspecting metals because it allows for the detection of internal defects such as voids, cracks, and inclusions without requiring any physical alteration to the material. This method uses high-energy radiation, typically X-rays or gamma rays, to penetrate the material and produce images on a radiographic film or a digital detector. Metals are commonly used in construction and manufacturing, making their structural integrity critical for safety and performance.

While other materials like concrete, wood, and plastics can be tested using different non-destructive testing methods, they are not the primary focus of Radiographic Testing. For instance, concrete may be tested using ultrasonic methods or impedance techniques better suited to its density and internal structure. Wood testing often involves visual inspection and moisture analysis, while plastics are typically evaluated for defects using methods like ultrasonic or thermal imaging, which are more effective for their physical properties. In summary, Radiographic Testing is predominantly used for metals due to its effectiveness in revealing internal flaws that could compromise their integrity.