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: electromagnetic radiation consisting of photons, …
Radiation | Definition, Types, Effects, & Facts | Britannica
Dec 19, 2025 · 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 …
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 …
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.
Radiation and Your Health | CDC
Learn about strategies that can help you stay safe from radiation. Learn about ionizing radiation and its medical applications such as diagnostic testing. Learn about the potential health effects of radiation …
Radiation - World Health Organization (WHO)
Jul 10, 2024 · Radiation is energy that travels in the form of waves or particles and is part of our everyday environment. People are exposed to radiation from cosmic rays, as well as to radioactive …
Basics of Radiation - REAC/TS
Radiation is energy, in the form of particles or electromagnetic rays, released from radioactive atoms. The three most common types of radiation are alpha particles, beta particles, and gamma rays.