radioactive decay

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Related to Radio activity: half life, artificial radioactivity

radioactive decay

the disintegration of the nucleus of an unstable nuclide by the spontaneous emission of charged particles, photons, or both.

radioactive decay

The continual loss of energy by radioactive substances. Disintegration of the nucleus by the emission of alpha, beta, or gamma rays eventually results in the complete loss of radioactivity. The time required for some materials to become stable may be minutes and, for others, thousands of years.
See: half-life
See also: decay


characterized by radioactivity.

radioactive decay
spontaneous decomposition of the nuclei of the atoms of radioactive substances. Measured as the proportion of the atoms in a radionuclide that decompose per unit of time, usually stated as the half-life of that particular isotope.
radioactive fallout
dissemination of radioactive substances through the atmosphere and deposition on the environment generally; causes radiation injury.
radioactive isotope
radionuclide. A radioactive nuclide, e.g. radioactive iodine or strontium.
radioactive tracer
see radioactive tracer.
References in periodicals archive ?
Eventually a neighbouring European country monitored a massive increase of radio activity.
The offer is flagged up by a TV campaign, radio activity and adverts in publications such as Asda's customer magazine.
Implementation of digital television throughout the VHF and UHF spectrum, as well as the possibility of increased business radio activity in the 450 to 470 MHz range, have created concern about the use of medical telemetry for many hospitals," said Lynn Conaway, Vice President of Corporate Accounts.
Tenders are invited for TN-44, Radio activity laboratory research side work module
Some other enhancements include four selectable muting functions: music mute on, where both cabin chatter and radio activity mutes the music; music mute off, for uninterrupted music flow regardless of radio or intercom activity; radio mute, where only the aircraft radio mutes the music; and intercom mute, where only activity inside the cabin mutes the music.
Trolley, floor, basket and field marketing campaigns galvanise other TV, outdoor or radio activity and act as a perfectly timed reminder to consumers to purchase.

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