technetium
noun
tech·ne·tium
tek-ˈnē-sh(ē-)əm 
: a radioactive metallic element obtained especially from nuclear fuel as a product of uranium fission and used as a diagnostic radiopharmaceutical see Chemical Elements Table
Examples of technetium in a Sentence
Recent Examples on the Web
Some other elements in nature with no stable isotope are technetium, polonium, actinium and uranium.
—
Kelling Donald, The Conversation, 13 Oct. 2025
Additionally, a heart scan with technetium pyrophosphate will likely be performed to look for amyloid involving the heart.
—Patty Weasler, Verywell Health, 2 July 2025
Like all elements first born in cyclotrons, technetium was radioactive.
—Neima Jahromi, The New Yorker, 27 Dec. 2019
But that’s not what all the technetium did: A considerable percentage formed a still-unidentified compound that the ion exchange columns don’t capture.
—Valerie Brown, Discover Magazine, 28 Sep. 2018
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Kelling Donald, The Conversation, 13 Oct. 2025
Additionally, a heart scan with technetium pyrophosphate will likely be performed to look for amyloid involving the heart.
—Patty Weasler, Verywell Health, 2 July 2025
Like all elements first born in cyclotrons, technetium was radioactive.
—Neima Jahromi, The New Yorker, 27 Dec. 2019
But that’s not what all the technetium did: A considerable percentage formed a still-unidentified compound that the ion exchange columns don’t capture.
—Valerie Brown, Discover Magazine, 28 Sep. 2018
Cite this Entry
“Technetium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/technetium. Accessed 3 Nov. 2025.
Copy CitationKids Definition
technetium
noun
tech·ne·tium
tek-ˈnē-sh(ē-)əm
: a radioactive metallic element obtained especially from nuclear fuel as a product of uranium fission see element
Medical Definition
technetium
noun
tech·ne·tium
tek-ˈnē-sh(ē-)əm
: a metallic element that is obtained by bombarding molybdenum with deuterons or neutrons and in the fission of uranium and that is used in medicine in the preparation of radiopharmaceuticals
—symbol Tc
see pertechnetate Chemical Elements Table
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