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britannica.com
https://www.britannica.com/science/radioactivity
Radioactivity | Definition, Types, Applications, & Facts | Britannica
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.
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wikipedia.org
https://en.wikipedia.org/wiki/Radioactive_decay
Radioactive decay - Wikipedia
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.
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energy.gov
https://ehss.energy.gov/ohre/roadmap/achre/intro_9…
What Is Radioactivity? - Energy.gov
As its name implies, radioactivity is the act of emitting radiation spontaneously. This is done by an atomic nucleus that, for some reason, is unstable; it "wants" to give up some energy in order to shift to a more stable configuration.
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sciencefacts.net
https://www.sciencefacts.net/radioactive-decay.htm…
Radioactivity: Definition, Types, Formula, and Applications
Radioactivity occurs when an atom has an excess of energy, mass, or both, making its nucleus unstable. To reach a lower, more stable energy level, it releases energy in the form of radiation. This radiation can be emitted as particles or electromagnetic waves, depending on the nature of the decay.
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sciencenotes.org
https://sciencenotes.org/radioactivity-and-the-typ…
Radioactivity and the Types of Radioactive Decay
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.
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allthescience.org
https://www.allthescience.org/what-is-radioactivit…
What Is Radioactivity? (with pictures) - AllTheScience
Radioactivity is the process whereby unstable atomic nuclei release energetic subatomic particles or electromagnetic radiation (EMR). This phenomenon can cause one element to turn into another and is partly responsible for the heat of the Earth’s core.
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nrc.gov
https://ww2.nrc.gov/about-nrc/radiation/health-eff…
Radiation Basics | Nuclear Regulatory Commission
These forces within the atom work toward a strong, stable balance by getting rid of excess atomic energy (radioactivity). In that process, unstable nuclei may emit a quantity of energy, and this spontaneous emission is what we call radiation.
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gsu.edu
http://www.hyperphysics.phy-astr.gsu.edu/hbase/Nuc…
Radioactivity - HyperPhysics
Radioactive decay rates are normally stated in terms of their half-lives, and the half-life of a given nuclear species is related to its radiation risk. The different types of radioactivity lead to different decay paths which transmute the nuclei into other chemical elements.
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modern-physics.org
https://modern-physics.org/radioactivity/
Radioactivity | Understanding Its Basics & Effects
Radioactivity is a natural phenomenon involving the decay of unstable atomic nuclei, which release energy in the form of radiation. This process helps us understand atomic structures and has applications ranging from medical treatments to energy production.
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libretexts.org
https://chem.libretexts.org/Bookshelves/Introducto…
11.1: Radioactivity - Chemistry LibreTexts
This page offers a comprehensive overview of radioactivity, detailing atomic structure and the different types of radioactive emissions: alpha particles, beta particles, and gamma rays.