Electromagnetic radiation can be described in terms of a stream of photons, which are particles without mass, each traveling in a wave-like pattern and moving (circling) at the speed of light. Both x ray and gamma rays belong to electromagnetic spectrum, the difference between them is their origin. read more
PET scans also depend on the detection of gamma rays. Difference Between X-Rays and Gamma Rays Production. X-rays are produced when energetic electrons lose energy. Gamma rays are produced by radioactive nuclei. Wavelength. X-rays have a larger wavelength (and hence a smaller frequency) than gamma. Energy. X-ray photons carry more energy than gamma photons. read more