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radioactive element

   Also found in: Encyclopedia 0.01 sec.
radioactive element,
an element subject to spontaneous degeneration of its nucleus accompanied by the emission of alpha particles, beta particles, or gamma rays. All elements with atomic numbers greater than 83 are radioactive. Naturally occurring radioactive elements include radium, thorium, and uranium. Several radioactive elements not found in nature have been produced by the bombardment of stable elements with subatomic particles in a cyclotron. Compare stable element. See also radioactivity.


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The ship, which officials said might contain radioactive elements, lay in 500m of water in the Tyrrhenian Sea.
Toxic ship is 'sunk by the Mafia' GANGSTERS by The Mirror (London, England)
Wang Xuhui, a researcher at the Xian-based Northwest Institute of Nuclear Technology, said the plant's products were safe, while most of the radioactive element had been mixed in the slags.
Radioactive material found in China: state media by AFP / AFP Asian Edition
An element that goes through this process is said to be radioactive, and radioactive elements occur naturally in the Earth.
Earth from the inside out by Ornes, Stephen / Science News for Kids
 
 
 
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