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  1. Radiation | Definition, Types, Effects, & Facts | Britannica

    Dec 19, 2025 · Radiation, flow of atomic and subatomic particles and of waves, such as those that characterize heat rays, light rays, and X rays. All matter is constantly bombarded with radiation of …

  2. Radiation - Wikipedia

    In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. [1][2] This includes: Radiation is often categorized as either ionizing or …

  3. What Is Radiation? Definition, Types, and Examples

    Aug 30, 2025 · In physics, radiation is defined as the emission and propagation of energy through space or a material medium, in the form of waves or subatomic particles. This energy can take several …

  4. RADIATION Definition & Meaning - Merriam-Webster

    The meaning of RADIATION is the action or process of radiating. How to use radiation in a sentence.

  5. Radiation Basics | US EPA

    Sep 10, 2025 · Radiation is energy. It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines. Radiation travels from its source in the form of energy waves or …

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  6. RADIATION Definition & Meaning | Dictionary.com

    Radiation is given off by a wide variety of processes, such as thermal activity, nuclear reactions (as in fission), and by radioactive decay. The emission or movement of such particles through space or a …

  7. What is Radiation? - International Atomic Energy Agency

    Jan 25, 2023 · Radiation is energy that moves from one place to another in a form that can be described as waves or particles. We are exposed to radiation in our everyday life. Some of the most familiar …

  8. RADIATION | English meaning - Cambridge Dictionary

    RADIATION definition: 1. a form of energy that comes from a nuclear reaction and that can be very dangerous to health…. Learn more.

  9. What is Radiation? - UCSF Radiology

    Radiation is a form of energy that travels through space or matter. It's all around us, coming from both natural and man-made sources. We are all exposed to radiation every day, mainly from the sun.

  10. What is Radiation and What Types of Radiation Are There?

    Radiation is energy that comes from a source, travels through space and may be able to penetrate various materials.