On November 8, 895, the German physicist Professor Roentgen discovered X-rays while experimenting with cathode rays in a glass test tube. Roentgen didn’t know what these rays were, so he called them “X-rays.” X-ray is a powerful light. Compared with light waves, X-rays have much higher energy and stronger penetrating power, allowing them to pass through materials that ordinary light waves cannot penetrate. As shown in the figure below, X-rays can penetrate many non-metallic materials.
In addition to the use of X-ray machines in the medical industry, X-ray inspection equipment is also used in other industries (such as airport baggage screening machines and video). These application scenarios are the same in principle.