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    radioactive
    /ˌreɪdɪəʊˈaktɪv/

    adjective

    • 1. emitting or relating to the emission of ionizing radiation or particles: "radioactive decay"

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  2. www.britannica.com › science › radioactivityRadioactivity | Definition, Types, Applications, & Facts

    Jun 21, 2024 · Radioactivity is the property of some nuclei to emit energy and particles spontaneously. Learn about the types of radioactivity (alpha, beta, gamma, etc.), their applications, and their effects on matter and energy.

  3. www.thoughtco.com › definition-of-radioactivity-606338Radioactivity Definition in Science - ThoughtCo

    Radioactivity is the spontaneous emission of radiation from an unstable atomic nucleus. Learn about the units, types, and sources of radioactivity, and how it differs from other forms of radiation.

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  5. ehss.energy.gov › ohre › roadmapWhat Is Radioactivity? - Energy

    Radioactivity is the spontaneous emission of radiation by unstable atomic nuclei. Learn how radioactivity is measured, what is radioactive half-life, and how radioactivity can be caused artificially or naturally.

  6. www.iaea.org › newscenter › newsWhat is Radiation? | IAEA - International Atomic Energy Agency

    Jan 25, 2023 · Radiation is energy that moves in waves or particles. Learn about the different types of radiation, their beneficial and harmful effects, and how to protect yourself and the environment from ionizing radiation.

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  7. scitechdaily.com › science-made-simple-what-is-radioactivityScience Made Simple: What Is Radioactivity? - SciTechDaily

    Jan 17, 2021 · Radioactivity is the release of energy from the decay of unstable atomic nuclei. Learn about the types of radioactive particles, the effects of radioactivity, and the applications and research of radioactivity supported by the DOE Office of Science.

  8. www.energy.gov › science › doe-explainsradioactivityDOE Explains...Radioactivity | Department of Energy

    Radioactivity is the release of energy from the decay of the nuclei of certain kinds of atoms and isotopes. Learn about the types, effects, and uses of radioactivity, and how the DOE Office of Science supports research and development of radioactive isotopes.

  9. cosmosmagazine.com › science › physicsWhat is radioactivity? - Cosmos

    Oct 29, 2021 · As Becquerel and the Curies discovered, radioactivity is a naturally-occurring phenomenon. Many minerals in the Earth emit a slow and steady trickle of radiation, the air we breathe contains...