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  1. Dictionary
    radioactivity
    /ˌreɪdɪəʊakˈtɪvɪti/

    noun

    • 1. the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.

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

    Jun 21, 2024 · Radioactivity, property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual atomic nuclei.

  3. byjus.com › physics › radioactivity-alpha-decayWhat is Radioactivity - Definition, Laws, Units, Alpha Decay,...

    Radioactivity is a phenomenon exhibited by a few matters of emitting energy and subatomic particles spontaneously. Radioactivity is due to the nuclear instability of an atom.

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

    Sep 6, 2019 · Radioactivity is the spontaneous emission of radiation in the form of particles or high energy photons resulting from a nuclear reaction. It is also known as radioactive decay, nuclear decay, nuclear disintegration, or radioactive disintegration.

  5. www.scienceabc.com › pure-sciences › what-is-radioactivity-simple-definition-typesWhat Is Radioactivity: Simple Definition, Explanation And...

    Jun 2, 2024 · Radioactive decay is a nucleus' journey to attaining stability via emission of highly energetic radiation and subatomic particles. This phenomenon is called radioactivity

  6. sciencenotes.org › radioactivity-and-the-types-of-radioactive-decayRadioactivity and the Types of Radioactive Decay

    May 30, 2021 · Radioactivity is the spontaneous emission of ionizing radiation from nuclear decay and reactions. The three main types of radioactive decay are alpha, beta, and gamma decay, but there are other nuclear reactions responsible for radioactivity.

  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 the nuclei of certain kinds of atoms and isotopes. Atomic nuclei consist of protons and neutrons bound together in tiny bundles at the center of atoms.

  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. Atomic nuclei consist of protons and neutrons bound together in tiny bundles at the center of atoms.

  9. www.britannica.com › science › radiationRadiation | Definition, Types, Effects, & Facts | Britannica

    Jul 5, 2024 · 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 both types from cosmic and terrestrial sources. This article delineates the properties and behaviour of radiation.

  10. www.merriam-webster.com › dictionary › radioactivityRadioactivity Definition & Meaning - Merriam-Webster

    The meaning of RADIOACTIVITY is the property possessed by some elements (such as uranium) or isotopes (such as carbon 14) of spontaneously emitting energetic particles (such as electrons or alpha particles) by the disintegration of their atomic nuclei; also : the rays emitted.

  11. www.arpansa.gov.au › understanding-radiation › what-is-radiationRadioactivity | ARPANSA

    Radioactivity is the property of some unstable atoms ( radionuclides) to spontaneously emit nuclear radiation, usually alpha particles or beta particles often accompanied by gamma-rays.