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  1. Radiation - Wikipedia

    The radiation emitted covers the entire electromagnetic spectrum and the intensity of the radiation (power/unit-area) at a given frequency is described by Planck's law of radiation.

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

    May 15, 2026 · All matter is constantly bombarded with radiation of both types from cosmic and terrestrial sources. This article delineates the properties and behaviour of radiation and the matter …

  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 Explained: How It Works, Its Risks, and When ...

    Feb 28, 2026 · Radiation science explains how ionizing and non-ionizing radiation interact with matter, their health effects, and safety measures to minimize exposure.

  5. Radiation Basics - US EPA

    Mar 24, 2026 · 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 …

  6. Radiation Therapy for Cancer - NCI

    May 15, 2025 · Radiation therapy is a type of cancer treatment that uses high doses of radiation to kill cancer cells and shrink tumors. Learn about the types of radiation, why side effects happen, which …

  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 …