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en.wikipedia.org/wiki/Radioactive_decay

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 decay, beta decay, and gamma decay, all of which involve emitting one or more particles ...

www.thefreedictionary.com/radioactive+decay

Define radioactive decay. radioactive decay synonyms, radioactive decay pronunciation, radioactive decay translation, English dictionary definition of radioactive decay. n. 1.

www.nuclear-power.net/.../reactor-physics/atomic-nuclear-physics/radioactive-decay

Nuclear decay (Radioactive decay) occurs when an unstable atom loses energy by emitting ionizing radiation. Radioactive decay is a random process at the level of single atoms, in that, according to quantum theory, it is impossible to predict when a particular atom will decay. In other words, a nucleus of a radionuclide has no “memory”.

www.dictionary.com/browse/radioactive-decay

Radioactive decay definition, decay(def 8). See more.

study.com/academy/lesson/radioactive-decay-definition-formula-types.html

Radioactive decay of a radioactive substance or material can be measured by the half-life, which is the time it takes for the radioactive material to decay to half of its original amount.

www.collinsdictionary.com/dictionary/english/radioactive-decay

Radioactive decay definition: disintegration of a nucleus that occurs spontaneously or as a result of electron capture... | Meaning, pronunciation, translations and examples Log In Dictionary

www.radiation-dosimetry.org/what-is-radioactive-decay-definition

Nuclear decay (Radioactive decay) occurs when an unstable atom loses energy by emitting ionizing radiation. Radioactive decay is a random process at the level of single atoms, in that, according to quantum theory, it is impossible to predict when a particular atom will decay. In other words, a nucleus of a radionuclide has no “memory”.

medical-dictionary.thefreedictionary.com/radioactive+decay

The upward conduction of heat generated by radioactive decay within the over-thickened fertile lithospheric mantle will cause the increasing of temperature in the deep crust and the shallow mantle, and results in the decrease of seismic velocity in the shallow mantle, which is observed in the north part of Tibet plateau.

www.nrc.gov/reading-rm/basic-ref/glossary/radioactive-decay.html

Radioactive decay. The spontaneous transformation of one radioisotope into one or more different isotopes (known as “decay products” or “daughter products”), accompanied by a decrease in radioactivity (compared to the parent material). This transformation takes place over a defined period of time (known as a “half-life”), as a result of electron capture; fission; or the emission of ...

www.britannica.com/science/radioactivity

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 is a property of several naturally occurring elements as well as of artificially produced isotopes of the elements.