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Radioactivity | Definition, Types, Applications, & Facts | Britannica
Dec 6, 2025 · 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.
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 …
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 …
RADIOACTIVE Definition & Meaning - Merriam-Webster
Dec 4, 2016 · The meaning of RADIOACTIVE is of, caused by, or exhibiting radioactivity. How to use radioactive in a sentence.
The Radioactive Atom: An Overview | Radiation and Your Health …
Feb 22, 2024 · But some atoms have an unstable combination blend of protons and neutrons, and these are considered radioactive. To get to a more stable state, the atom expels energy from …
Radioactive Dating – Using Half-Life to Determine Age
Radioactive dating is the process of using radiation emitted by radioisotopes to determine the age of an archaeological artifact or geologic formation. The most common type of radioactive …
Radioactivity: Definition, Types, Formula, and Applications
Jun 10, 2025 · 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 …
Radioactivity 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, …
What Is Radioactivity: Simple Definition, Explanation And Examples
Jun 2, 2024 · What Exactly Is Radioactivity ? Radioactive decay is a nucleus’ journey to attaining stability via emission of highly energetic radiation and subatomic particles. This phenomenon …