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radioactive

adjective

ra·​dio·​ac·​tive ˌrā-dē-ō-ˈak-tiv How to pronounce radioactive (audio)
1
: of, caused by, or exhibiting radioactivity
radioactive isotopes
Radon is an odorless, colorless gas that arises naturally from the ground because of the decay of radioactive elements commonly found in rocks and many types of soil. In a chain of radioactive decay, uranium produces radium, which gives off radon, which in turn produces radioactive breakdown products that are harmful if inhaled. Warren E. Leary
2
: so divisive or controversial as to require avoidance
He has been deemed radioactive by most charitable organizations … and organized competition, even local stuff, is largely closed off to him. Asher Price
Almost all women—and therefore men—use a form of birth control at some point in their lives, yet contraception is so politically and legally radioactive that legislators and pharmaceutical companies avoid funding it. Karen Weise
Subsequent polling data show that the quota issue is perhaps the most powerful one in our politics … A House Democratic aide says, "The quota issue is radioactive." The result has been nothing less than panic in the Democratic ranks. Elizabeth Drew
radioactively adverb
Plutonium is the only one of these transuranic elements that can exist a fair amount of time before radioactively decaying into lighter elements. James Kaler

Example Sentences

Uranium and plutonium are radioactive.
Recent Examples on the Web The doctor who finally entered the room was adorned in full personal protective gear — face shield, mask, gown, and gloves — and stood as far from the bed as possible, as if Ricky was somehow radioactive. Ofole Mgbako, STAT, 22 Aug. 2022 To create nuclear fission, atoms of radioactive elements like Uranium are broken apart with neutrons to release an enormous amount of energy. Sarah Wells, Popular Mechanics, 22 July 2022 In the early 1900s, scientists were on the hunt for new radioactive elements. Artemis Spyrou, The Conversation, 24 May 2022 Radon occurs naturally in the presence of radioactive elements, such as uranium and radium. Brian Maffly, The Salt Lake Tribune, 20 May 2022 And while a fission weapon uses radioactive elements like uranium and plutonium, the particles in a fusion process are hydrogen molecules. Katie Hafner, Scientific American, 21 Apr. 2022 The finding also means that there is more heat in Pluto's interior than astronomers previously thought, likely powered by the decay of radioactive elements in the dwarf planet's interior, per Linda Geddes for the Guardian. Corryn Wetzel, Smithsonian Magazine, 31 Mar. 2022 Without a constant flow of coolant to keep it from overheating, the radioactive material could evaporate and burn away its casing, releasing its toxic particles into the atmosphere. Tristan Bove, Fortune, 8 Aug. 2022 The shelling on Friday did not damage any of Zaporizhzhia’s six reactors and did not release radioactive material to the environment, according to Grossi, but the plant sustained damage elsewhere. Praveena Somasundaram, Washington Post, 6 Aug. 2022 See More

Word History

Etymology

International Scientific Vocabulary

First Known Use

1898, in the meaning defined at sense 1

Time Traveler
The first known use of radioactive was in 1898

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