an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium.
an extremely accurate clock in which an electrical oscillator is controlled by the natural vibrations of an atomic or molecular system such as caesium or ammonia
An extremely precise clock whose rate is controlled by a periodic process (such as vibration, or the absorption or emission of electromagnetic radiation) that occurs at a steady rate in atoms or molecules. The standard atomic clock is based on the vibrations of cesium atoms and is so accurate that it would gain or lose less than one second in three million years. Atomic clocks are used to help track satellites, run navigation systems, and study movements of the Earth’s crust.
The most accurate clock available. Time is measured by the movement of electrons in cesium atoms. The standard second is now defined by measurements on an atomic clock.
- Atomic cocktail
an oral dose of a radioactive substance used in the treatment or diagnosis of cancer. noun an aqueous solution of radioactive substance administered orally as part of the treatment for cancer
- Atomic energy
. Contemporary Examples By 1951, Maclean was head of the American department of the Foreign Office, with access to the US atomic energy Commission. What the Spies Knew: The Secret World of Anglo-American Intelligence Emma Garman September 20, 2013 Shahriari was a member of Iran’s atomic energy Agency and by all accounts an integral part […]
- Atomic energy authority
noun (in Britain) a government body established in 1954 to control research and development in atomic energy AEA
- Atomic energy commission
a former federal agency (1946–75) created to regulate the development of the U.S. atomic energy program: functions transferred to the Nuclear Regulatory Commission. Abbreviation: AEC. Contemporary Examples By 1951, Maclean was head of the American department of the Foreign Office, with access to the US Atomic Energy Commission. What the Spies Knew: The Secret World […]