“Radiations”  

Radiation

  Radiations are the emission or propagation of acoustic waves (sound), electromagnetic energy waves (such as light, radio waves, gamma rays, or x-rays), or a stream of subatomic particles (such as electrons, neutrons, protons, or alpha particles).
  In chemistry, all of the elements heavier than Bismuth (Bi) [Atomic Number: 83] and a few lighter than bismuth are considered at least somewhat naturally radioactive.
  Examples of radiation concepts and topics include:

electromagnetic radiations Gamma Rays Light Radio Waves Terahertz Radiation X-Rays

ionizing radiation non-ionizing radiation Radiation Absorption Radiation Dosage Radiation Effects Radiation Exposure

Solar Energy Radioactivity Radiotherapy Radiometry Nuclear Warfare

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