Radioactive

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Radioactive

Last update: Tuesday 02nd of December 2008

This article is about radioactivity in nuclear physics. For other uses, see Radioactive (disambiguation).

For decay rate in a more general context, see Particle decay.

This article needs additional citations for verification.
Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (July 2008)

Nuclear physics

Radioactive decay
Nuclear fission
Nuclear fusion

Classical decays
Alpha decay · Beta decay · Gamma radiation · Cluster decay

Advanced decays
Double beta decay · Double electron capture · Internal conversion · Isomeric transition

Emission processes
Neutron emission · Positron emission · Proton emission

Capturing
Electron capture · Neutron capture R · S · P · Rp

Fission
Spontaneous fission · Spallation · Cosmic ray spallation · Photodisintegration

Nucleosynthesis
Stellar Nucleosynthesis Big Bang nucleosynthesis Supernova nucleosynthesis

Scientists
Becquerel · Bethe · Marie Curie · Pierre Curie · Fermi

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Radioactive decay is the process in which an unstable atomic nucleus loses energy by emitting ionizing particles and radiation. This decay, or loss of energy, results in an atom of one type, called the parent nuclide transforming to an atom of a different type, called the daughter nuclide. For example: a carbon-14 atom (the "parent") emits radiation and transforms to a nitrogen-14 atom (the "daughter"). This is a random process on the atomic level, in that it is impossible to predict when a given atom will decay, but given a large number of similar atoms, the decay rate, on average, is predictable. The SI unit of radioactive decay (the phenomenon of natural and artificial radioactivity) is the becquerel (Bq). One Bq is defined as one transformation (or decay) per second. Since any reasonably-sized sample of radioactive material contains many atoms, a Bq is a tiny measure of activity; amounts on the order of TBq (terabecquerel) or GBq (gigabecquerel) are commonly used. Another unit of (radio)activity is the curie, Ci, which was originally defined as the activity of one gram of pure radium, isotope Ra-226. At present it is equal (by definition) to the activity of any radionuclide decaying with a disintegration rate of 3.7 × 10¹⁰ Bq. The use of Ci is presently discouraged by SI.

Radioactive

Radioactive decay is the process in which an unstable atomic nucleus loses energy by emitting radiation in the form of particles or electromagnetic waves.

Radioactive decay - Wikipedia, the free encyclopedia

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Radioactive

Radioactive Records

adjective Physics, Chemistry. of, pertaining to, exhibiting, or caused by radioactivity.

radioactive definition | Dictionary.com

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