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radioisotope

American  
[rey-dee-oh-ahy-suh-tohp] / ˌreɪ di oʊˈaɪ səˌtoʊp /

noun

  1. a radioactive isotope, usually artificially produced: used in physical and biological research, therapeutics, etc.


radioisotope British  
/ ˌreɪdɪəʊˈaɪsətəʊp, ˌreɪdɪəʊˌaɪsəˈtɒpɪk /

noun

  1. an isotope that is radioactive

"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

radioisotope Scientific  
/ rā′dē-ō-īsə-tōp′ /
  1. A radioactive isotope of a chemical element. Carbon 14 and radon 222 are examples of naturally occurring radioactive isotopes.


Other Word Forms

Etymology

Origin of radioisotope

First recorded in 1940–45; radio- + isotope

Vocabulary lists containing radioisotope

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Voyager 1, like its twin Voyager 2, is powered by a radioisotope thermoelectric generator that converts heat from decaying plutonium into electricity.

From Science Daily • May 4, 2026

Now, the team is building a new kind of fusion reactor, which will be able to produce any kind of radioisotope for research or medicine, right by the hospitals that need it.

From BBC • Feb. 26, 2025

The probes use three plutonium dioxide radioisotope thermoelectric generators.

From Salon • May 7, 2023

For the weapon’s radiation to be lethal, the radioisotope used would have to have a strong enough intensity to harm people.

From New York Times • Oct. 25, 2022

Starting around Christmas 1937, when he administered his first dose of a phosphorus radioisotope to a patient at the university medical center, John’s need for the substance became “insatiable,” Kamen recalled.

From "Big Science" by Michael Hiltzik

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