X-Rays

**Definition:** Penetrating electromagnetic radiation emitted when the inner orbital electrons of an atom are excited and release radiant energy. X-ray wavelengths range from 1 pm to 10 nm. Hard X-rays are the higher energy, shorter wavelength X-rays. Soft x-rays or Grenz rays are less energetic and longer in wavelength. The short wavelength end of the X-ray spectrum overlaps the GAMMA RAYS wavelength range. The distinction between gamma rays and X-rays is based on their radiation source.

**Tree numbers:** - G01.358.500.505.970 - G01.750.250.970 - G01.750.750.918

**Synonyms:** - X-Ray - X Ray - Roentgen Rays - Radiation, X - X-Radiation - Xrays - Roentgen Ray - Xray