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Definitions

radioactivity

[rey-dee-oh-ak-tiv-i-tee] / ˌreɪ di oʊ ækˈtɪv ɪ ti /


NOUN
radiation
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.

It also has bet on aneutronic fuels, which are seen as cleaner but require higher temperatures, while competitors have relied on neutronic fuels associated with more radioactivity but lower temperatures.

From MarketWatch • May 18, 2026

There, Erikson teased out the stealthy, almost sinister peculiarities of modern man-made hazards, like radioactivity and toxicity, and their special, traumatic effects.

From The Wall Street Journal • Dec. 18, 2025

"Three hours before the scan, we inject patients with a tiny amount of radioactivity," explained consultant radiologist, Dr Randeep Kulshrestha.

From BBC • Feb. 26, 2025

The Cabrera Services report noted the radioactivity at the Albany Bulb is consistent with other landfills that accept construction debris, which may contain naturally radioactive material, such as granite.

From Los Angeles Times • Dec. 2, 2024

Alvarez seconded Nahmias’s perception that the cyclotron was used “as a radioactivity factory first of all because great numbers of new radioisotopes could be discovered that way with very little effort.”

From "Big Science" by Michael Hiltzik




Vocabulary lists containing radioactivity


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