x-ray

Form of electromagnetic radiation that has a higher energy and lower wavelength than visible light; they can be generated by accelerating electrons at a metal target creating photons (form of energry) that are able to penetrate most substances. X-rays are used in radiography to produce images of internal body structures on a photographic plate; tissues with higher density (e.g. bone) more readily absorb x-ray photons than tissues with lower density (e.g. soft tissue).