radioisotope

noun
ra·​dio·​iso·​tope | \ˌrā-dē-ō-ˈī-sə-ˌtōp \

Definition of radioisotope 

: a radioactive isotope

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Other Words from radioisotope

radioisotopic \ ˌrā-​dē-​ō-​ˌī-​sə-​ˈtä-​pik , -​ˈtō-​ \ adjective
radioisotopically \ ˌrā-​dē-​ō-​ˌī-​sə-​ˈtä-​pi-​k(ə-​)lē \ adverb

Examples of radioisotope in a Sentence

Recent Examples on the Web

Additionally, the rover has eight radioisotope heater units (RHU) in its body providing about 8 watts of thermal energy. Jay Bennett, Popular Mechanics, "NASA Optimistic That Opportunity Can Survive Martian Dust Storm," 13 June 2018 But with a radioisotope thermoelectric generator (RTG) for power, the rover is not in any significant danger. Jay Bennett, Popular Mechanics, "NASA Optimistic That Opportunity Can Survive Martian Dust Storm," 13 June 2018 Because of an editing error, two picture captions with an article last Sunday about the radioisotope Molybdenum-99 referred incorrectly to its role in medical diagnostics. New York Times, "Corrections: January 21, 2018," 21 Jan. 2018 After being injected with a radioisotope and riding a stationary bike, the young doctor was gentle in the face of discouraging films and old news. Sorayya Khan, Longreads, "The Cities in Me," 8 Feb. 2018 The reactor itself became a globally dominant supplier of radioisotopes—in particular, molybdenum-99, a workhorse of medical imaging employed for millions of scans every year. Tim Lougheed, Science | AAAS, "Canada’s neutron scientists lament closure of world’s oldest nuclear reactor," 21 Sep. 2017 For instance, rock art on the Indonesia island of Sulawesi was found to be a minimum of 40,000 years old using a technique called uranium-thorium radioisotope dating. Jason Daley, Smithsonian, "New Technique Shows San Rock Art Is 5,000 Years Old," 19 Apr. 2017 When a water leak caused by corrosion unexpectedly took the NRU offline later that same year, a global medical radioisotope shortfall ensued. Tim Lougheed, Science | AAAS, "Canada’s neutron scientists lament closure of world’s oldest nuclear reactor," 21 Sep. 2017 The three radioisotope generators on ship, which use the slow decay of a lump of plutonium to provide it with electricity, could keep working for decades to come. The Economist, "AstronomyAfter exploring Saturn, Cassini faces a fiery end," 7 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radioisotope.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of radioisotope

1938, in the meaning defined above

History and Etymology for radioisotope

International Scientific Vocabulary

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The first known use of radioisotope was in 1938

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More Definitions for radioisotope

radioisotope

noun
ra·​dio·​iso·​tope | \ˌrād-ē-ō-ˈī-sə-ˌtōp \

Medical Definition of radioisotope 

: a radioactive isotope — compare radioelement

Other Words from radioisotope

radioisotopic \ -​ˌī-​sə-​ˈtäp-​ik, -​ˈtōp-​ik \ adjective
radioisotopically \ -​i-​k(ə-​)lē \ adverb

More from Merriam-Webster on radioisotope

Britannica English: Translation of radioisotope for Arabic Speakers

Britannica.com: Encyclopedia article about radioisotope

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