What voltage potential is needed to inspect 25mm thick steel?

To inspect 25mm thick steel, a voltage potential of 200 kV is generally required. This voltage level is effective in penetrating thicker materials, such as the specified 25mm steel. Higher voltage is necessary because the thickness of the material increases the attenuation of X-rays or gamma rays used in non-destructive testing methods like radiography.

At 200 kV, the energy level is suitable for providing adequate penetration depth, allowing for clear imaging of the internal features and potential flaws in the steel. It strikes a balance between sufficient penetration and manageable levels of radiation exposure for both the operator and the environment.

While the other options represent higher voltage potentials, they exceed what is typically needed for 25mm steel. Employing excessively high voltages may not yield significantly better results and can lead to increased radiation safety concerns and costs without providing practical benefits for inspecting steel of that thickness. Thus, the choice of 200 kV aligns with the requirements for effective non-destructive inspection of this material thickness.