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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.

His voice echoed in the damp tunnel where the spent nuclear fuel will be buried in holes drilled into the bedrock, where it will remain harmfully radioactive for thousands of years.

From Barron's • Jun. 1, 2026

Scientists have found that using a radioactive implant precisely where a tumor was removed in the brain can help patients get their cancer treated more quickly and in many cases, live longer.

From The Wall Street Journal • May 30, 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

Nuclear operators go through rigorous control measures to make sure they don’t carry radioactive dust out of the plant at the end of a workday.

From "Meltdown" by Deirdre Langeland



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