X-ray sources are devices or materials that produce X-rays, a form of electromagnetic radiation. The most common type of X-ray source is the X-ray tube, which generates X-rays by accelerating electrons and colliding them with a metal target. This process releases energy in the form of X-rays, which can be used for various applications, including medical imaging and industrial inspections. Another type of X-ray source is radioactive isotopes, which emit X-rays as they decay. These isotopes can be used in certain medical treatments and diagnostic procedures. Both types of X-ray sources play a crucial role in fields such as radiology and materials science.