Radiation is energy that comes from a source and travels through space at the speed of light.

  • Radiant energy has an electric field, and a magnetic field and may be described in terms of electromagnetic waves or in terms of bundles of photons travelling in a wave-like pattern.
  • Visible light is a form of radiation often described in terms of either electromagnetic waves or photons.
  • Types of radiation with the highest energy include ultraviolet radiation, x-rays, and gamma rays.
  • When x-rays or gamma-rays interact with atoms, they can remove electrons which destabilises them and make them radioactive.
  • Radioactivity is the spontaneous release of energy from an unstable atom as it returns to a stable state.
  • Ionizing Radiation is the energy that comes out of a radioactive atom.