radioactivity

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ra·di·o·ac·tiv·i·ty

 (rā′dē-ō-ăk-tĭv′ĭ-tē)
n.
1. Spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.
2. The radiation, including alpha particles, nucleons, electrons, and gamma rays, emitted by a radioactive substance.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

radioactivity

(ˌreɪdɪəʊækˈtɪvɪtɪ)
n
(Nuclear Physics) the spontaneous emission of radiation from atomic nuclei. The radiation can consist of alpha, beta, and gamma radiation
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ra•di•o•ac•tiv•i•ty

(ˌreɪ di oʊ ækˈtɪv ɪ ti)

n.
the phenomenon, a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

ra·di·o·ac·tiv·i·ty

(rā′dē-ō-ăk-tĭv′ĭ-tē)
The emission of radiation by unstable atomic nuclei undergoing radioactive decay.
Did You Know? Within the nuclei of stable atoms, such as those of lead, the force binding the protons and neutrons to each other individually is great enough to hold the nuclei together as a whole. In the nuclei of other atoms, especially of heavy ones such as uranium atoms, this energy is not great enough, and the nuclei are unstable. An unstable nucleus gives off particles and energy in a process known as radioactivity. When enough particles and energy have been given off to create a new, stable nucleus (often the nucleus of an entirely different element), the radioactivity ceases. For example, uranium 238, a very unstable element, goes through 18 different stages of decay before finally turning into a stable isotope of lead, lead 206. (Some of the intermediate stages include the heavier elements thorium, radium, radon, and polonium.) All known elements with an atomic number greater than 83 (bismuth) are radioactive, and many isotopes of elements with lower atomic numbers are radioactive too.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

radioactivity

The spontaneous emission of radiation, generally alpha or beta particles, often accompanied by gamma rays, from the nuclei of an unstable isotope.
Dictionary of Military and Associated Terms. US Department of Defense 2005.

radioactivity

the state, property, or process of being radioactive.
See also: Radiation
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.

radioactivity

1. The emission of rays and subatomic particles from the nuclei of certain elements decaying into others, notably uranium and its decay products, down to, but excluding, lead. Radioactivity from nuclear bombs and installations, and even certain rocks, can injure living tissues.
2. The spontaneous disintegration of certain isotopes accompanied by the emission of radiation (a-rays, b-rays, c-rays).
3. The emission of subatomic particles and rays due to the disintegration of the atomic nuclei of certain isotopes of some elements.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.radioactivity - the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
corpuscular radiation, particulate radiation - a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons)
emission - the release of electrons from parent atoms
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
إشعاعِيَّه
radioaktivita
radioaktivitet
radioaktivitás
geislavirkni
rádioaktivita
radyoaktivite

radioactivity

[ˈreɪdɪəʊækˈtɪvɪtɪ] Nradiactividad f, radioactividad f
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

radioactivity

[ˌreɪdiəʊækˈtɪvɪti] nradioactivité fradio alarm nradio-réveil mradio alarm clock nradio-réveil m
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

radioactivity

[ˌreɪdɪəʊækˈtɪvɪtɪ] nradioattività
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

radioactive

(reidiəuˈӕktiv) adjective
1. (of some substances, eg uranium) giving off rays which can be dangerous, but which can also be used in eg medicine. radioactive metals.
2. containing radioactive substances. radioactive waste/dust.
ˌradioacˈtivity noun
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.

ra·di·o·ac·tiv·i·ty

n. radiactividad, propiedad de ciertos elementos de producir radiaciones.
English-Spanish Medical Dictionary © Farlex 2012

radioactivity

n radiactividad f
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
What is the importance of radio analysis of various chemical samples to human life?The human environment is radioactive in nature and human beings are exposed to radiation arising from various sources including sun rays and natural radionuclides in water, air, soil and plants.Other forms of radiation could come from artificial radioactivity such as in medical and industrial applications, and mining.
The discharge of low-level liquid wastes from Sellafield is the most significant source of artificial radioactivity in the Irish Sea, Ireland's environmental watchdog has reported.
The man-made or artificial radioactivity sources include the uses of radionuclides in industries medicine in consumer products and nuclear weapon tests.