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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.

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. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay.

Radioactivity and the Types of Radioactive Decay - Science Notes and ...
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.

Radioactivity: Definition, Types, Formula, and Applications - Science Facts
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.

Science Made Simple: What Is Radioactivity? - SciTechDaily
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.

30.2: Radioactivity - Physics LibreTexts
Name major sources of terrestrial radiation. Radioactive material is found throughout nature. Detectable amounts occur naturally in soil, rocks, water, air, and vegetation. From these sources it can be inhaled and ingested into the body.

31.1: Nuclear Radioactivity - Physics LibreTexts
The discovery and study of nuclear radioactivity quickly revealed evidence of revolutionary new physics. In addition, uses for nuclear radiation also emerged quickly—for example, people such as …

Radioactive decay: Discovery, process and causes | Space
If an atomic nucleus isn't in its lowest-energy state possible, radioactive decay can happen when the nucleus reshuffles and reorganizes itself to find a new stable situation. The different...

10.4: Radioactive Decay - Physics LibreTexts
When an individual nucleus transforms into another with the emission of radiation, the nucleus is said to decay. Radioactive decay occurs for all nuclei with Z> 82, and also for some unstable isotopes with Z <83. The decay rate is proportional to the number of original (undecayed) nuclei N in a substance.

Radioactivity - HyperPhysics
Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation.

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