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Definitions

radioactive

[rey-dee-oh-ak-tiv] / ˌreɪ di oʊˈæk tɪv /
ADJECTIVE
active
Synonyms


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.

The fuel will be highly radioactive for "tens of thousands of years", he said.

From Barron's • Jun. 1, 2026

The director-general of the IAEA, Rafael Grossi, has warned repeatedly about the risk of a radioactive incident at such plants.

From Salon • May 21, 2026

“The dangers are so much different. Instead of an explosion, it just turns off. There’s no radioactive waste. So this light touch is exactly what the Congress overwhelmingly … wanted the NRC to do.”

From MarketWatch • May 18, 2026

By studying Antarctic ice that formed tens of thousands of years ago, researchers detected traces of iron-60, a rare radioactive form of iron created during supernova explosions.

From Science Daily • May 14, 2026

Without the suit, bits of dust containing radioactive isotopes could cling to clothes and hair, and might be inhaled or swallowed.

From "Meltdown" by Deirdre Langeland



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