electromagnetic radiation, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ).In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. Radiation, in general, exists throughout nature, such as in light and sound. The international symbol for types and levels of ionizing radiation (radioactivity) that are unsafe for unshielded humans. Note caveats in the text about this simplified diagram. Gamma radiation (γ) is dampened when it penetrates lead. Typical alpha particles (α) are stopped by a sheet of paper, while beta particles (β) are stopped by an aluminum plate. Illustration of the relative abilities of three different types of ionizing radiation to penetrate solid matter. For other uses, see Radiation (disambiguation).
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