radioactivity
the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element.
Origin of radioactivity
1- Also called activity.
Words Nearby radioactivity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use radioactivity in a sentence
The researchers did not report any evidence of radioactivity within the quasicrystal itself, Conover says.
Readers discuss the 1921 Tulsa race massacre, zombie fires and more | Science News Staff | August 8, 2021 | Science NewsThese fears were addressed instead by films that tickled the imagination, with giant insects transformed by radioactivity.
Climate Change Is the Biggest Story on Earth. So Why Can’t Hollywood Make Good TV Shows and Movies About It? | Jo Nesbø | April 17, 2021 | TimeAlthough radioactivity was discovered in 1896, that energy long remained an untapped resource.
How matter’s hidden complexity unleashed the power of nuclear physics | Emily Conover | April 8, 2021 | Science NewsThis would allow an estimate of the energy still left in the Martian core from a combination of its formation and radioactivity, a key element in understanding what geological activity might still be possible there.
“It is probably the purest environment in terms of radioactivity on Earth,” says Gioacchino Ranucci, a Borexino member.
We still don’t really know what’s inside the sun—but that could change very soon | Charlie Wood | November 30, 2020 | Popular-Science
Speculation: The scorch might have been made by radioactivity attendant upon the resurrection.
This new virus strain was accidentally produced in the course of some experiments with radioactivity.
Operation R.S.V.P. | Henry Beam PiperTwenty minutes after the irradiation period, the radioactivity of the calcium standards is measured by the same instrument.
The Atomic Fingerprint | Bernard KeischLater on, radioactivity from silver (silver-110m) can be measured using a longer counting time.
The Atomic Fingerprint | Bernard KeischSince the atomic wars, the increased radioactivity of the earth undoubtedly stimulates mitosis of the malignant cells.
The Star Lord | Boyd EllanbyTraces of natural radioactivity can be found, in fact, in all substances on earth.
Atoms, Nature, and Man | Neal O. Hines
British Dictionary definitions for radioactivity
/ (ˌreɪdɪəʊækˈtɪvɪtɪ) /
the spontaneous emission of radiation from atomic nuclei. The radiation can consist of alpha, beta, and gamma radiation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for radioactivity
[ rā′dē-ō-ăk-tĭv′ĭ-tē ]
The emission of radiation by unstable atomic nuclei undergoing radioactive decay.
a closer look
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for radioactivity
The emission of elementary particles by some atoms when their unstable nuclei disintegrate (see half-life). Materials composed of such atoms are radioactive. (See alpha radiation, beta radiation, and gamma radiation.)
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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