radioactive element


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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.

radioactive element

(1) A nonspecific term for any element that emits alpha or beta particles or gamma radiation. 
(2) Radionuclide, see there.
References in periodicals archive ?
Our team certified that the 10 packets which were lying near to import area that came to Delhi from Turkey via Turkish Airlines were radioactive element.
The conclusion of the commission, published in the form of general meeting minutes in 1997, showed that the factory sites did not include radioactive elements.
Maps that show radioactive element distribution provide information about fundamental mineralogical and geochemical properties of bedrock and surficial deposits, and have proven highly useful for geological mapping, mineral exploration, and environmental studies, often indicating geological features not seen by other techniques.
The next step is to experiment with the compound's ability to siphon away other common radioactive elements like cesium and uranium.
The agency said the radioactive element in the vapour that will be released would not affect the environment or human health.
A radioactive element is an element with an unstable nucleus that decays over time.
The stolen vehicle was carrying delicate cargo that included a radioactive element used for medical purposes that also can be used to make a so-called dirty bomb.
Contained within is a tiny amount of the radioactive element tritium, which will emit a glow for the next 10 years or so.
The recent studies have revealed that hair samples taken from 80 per cent of the neurologically disabled children, and their drinking water contained high levels of uranium, a radioactive element.
Weapon-grade uranium requires enriching the radioactive element for 90 percent and above.
But if radiation (radiating waves or particles emitted by some elements) were to accidentally spew from a local nuclear power plant--a plant that uses the radioactive element uranium to generate electricity--results could be dire.
It needs to dispose of fifty metric tons of plutonium, a highly radioactive element used in nuclear weapons.