radionuclide

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ra·di·o·nu·clide

 (rā′dē-ō-no͞o′klīd′, -nyo͞o′-)
n.
A radioactive nuclide, especially one used within the body for diagnostic or therapeutic purposes.
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.

radionuclide

(ˌreɪdɪəʊˈnjuːklaɪd)
n
(Nuclear Physics) a nuclide that is radioactive
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ra•di•o•nu•clide

(ˌreɪ di oʊˈnu klaɪd, -ˈnyu-)

n.
a radioactive nuclide.
[1945–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations
radionucléide

radionuclide

n radionúclido
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
The International Atomic Energy Agency (IAEA defines) Iridium-192, a highly unstable isotope which emits both electrons and gamma-rays, as a category-2 radioactive substance.
The unstable isotope silicon-34 has a bubblelike center with a paucity of protons, scientists report October 24 in Nature Physics.
Tritium is an unstable isotope with a half-life of 12.32 years.
Carbon-14 is an unstable isotope formed in the upper atmosphere through the action of cosmic rays, and its steady decay is the basis for carbon-dating of organic material.
Could it come apart like an overloaded, unstable isotope?