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Definition of Radioactive decay

Babylon English

gradual reduction in the number of radioactive atoms in material
Radioactive decay Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

radioactive decay
n : the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation [syn: decay, disintegration]



WordNet 2.0

Noun
1. the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
(synonym) decay, disintegration
(hypernym) nuclear reaction
(hyponym) alpha decay
Radioactive decay Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
(*) The decrease in the radiation intensity of any radioactive material with respect to time.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Radioactive decay Definition from Science & Technology Dictionaries & Glossaries
NRC Nuclear Energy Glossary
Large unstable atoms can become more stable by emitting radiation. This process is called radioactive decay. This radiation can be emitted in the form of a positively charged alpha particle, a negatively charged beta particle, or gamma rays or x-rays.

Radioactive Decay of an Atom
A service to the public by The U.S. Nuclear Regulatory Commission (NRC).
ASTRONOMY UNBOUND

The spontaneous disintegration of certain atomic nuclei by emission of either 2 protons bound with 2 neutrons (a helium nucleus), known as alpha decay , or of an electron, known as beta decay . If the emitted beta particle is the antimatter positive electron the disintegration process is termed positron emission. Radioactive decay is sometimes accompanied by the emission of gamma rays and is always accompanied by the transmutation of the atomic nucleus into another element which is more stable. The rate of decay, known as the halflife , together with the energy of the emitted particle, is unique to the radionuclide (the species of unstable nucleus).
Radioactive decay Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Radioactive decay, also known as nuclear decay or radioactivity, is the process by which a nucleus of an unstable atom loses energy by emitting particles of ionizing radiation. A material that spontaneously emits this kind of radiation—which includes the emission of energetic alpha particles, beta particles, and gamma rays—is considered radioactive.

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Radioactive decay Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
Spontaneous change in an atom by emission of of charged particles and/or gamma rays; also known as radioactive disintegration and radioactivity.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
Spontaneous change in an atom by emission of of charged particles and/or gamma rays; also known as radioactive disintegration and radioactivity.
Radioactive decay Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
galu-sayuk nehaya
Radioactive decay Definition from Medicine Dictionaries & Glossaries
CDC Radiological Terms
the spontaneous disintegration of the nucleus of an atom.
  
disintegration of the nucleus of an unstable atom by the release of radiation.
  
Source: Centers for Disease Control and Prevention (CDC) ( About )