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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.

That process releases huge amounts of energy, no carbon emissions and limited radioactivity.

From The Wall Street Journal • Dec. 18, 2025

It could release vast amounts of energy with little associated radioactivity.

From BBC • Dec. 18, 2025

The Burevestnik’s radioactivity could make it easy to detect.

From The Wall Street Journal • Oct. 28, 2025

Cabrera Services also said it’s “unlikely” the radioactivity is from large deposits of alum mud.

From Los Angeles Times • Dec. 2, 2024

Thanks to radioactivity the Earth could be–and self-evidently was–much older than the twenty-four million years Kelvin’s calculations allowed.

From "A Short History of Nearly Everything" by Bill Bryson