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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 is the property of some atomic nuclei to emit energy and subatomic particles spontaneously. Learn about the types of radioactivity (alpha, beta, gamma, etc.), their applications, and their rates of decay.

  3. en.wikipedia.org › wiki › Radioactive_decayRadioactive decay - Wikipedia

    1 day ago · Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay.

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

    Jul 5, 2024 · Radiation is energy in motion, either as waves or particles, that can interact with matter and transfer energy. Learn about the properties, behaviour, and applications of different forms of radiation, such as electromagnetic rays, matter rays, and neutrinos.

  6. www.britannica.com › science › radioactivityRadioactivity - Natural, Artificial, Decay | Britannica

    Jun 21, 2024 · Radioactivity - Natural, Artificial, Decay: Some species of radioactivity occur naturally on Earth. A few species have half-lives comparable to the age of the elements (about 6 × 109 years), so that they have not decayed away after their formation in stars.

  7. www.epa.gov › radiation › radiation-basicsRadiation Basics | US EPA

    Jul 5, 2024 · Radiation can come from unstable atoms or it can be produced by machines. There are two kinds of radiation; ionizing and non-ionizing radiation. Learn about alpha, beta, gamma and x-ray radiation.

  8. chem.libretexts.org › Courses › Brevard_College12.4: Radioactive Decay - Chemistry LibreTexts

    Jun 17, 2024 · Unstable nuclei undergo spontaneous radioactive decay. The most common types of radioactivity are α decay, β decay, γ emission, positron emission, and electron capture. Nuclear …

  9. quizlet.com › ie › 925619138Atomic Theory - Radioactivity Flashcards | Quizlet

    Jul 8, 2024 · Study with Quizlet and memorise flashcards containing terms like Describe the process through which radioactivity was discovered, What is a Geiger muller tube?, What are the SI units of radioactivity and others.