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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

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

A becquerel is defined as a small unit of radioactivity.

From BBC • Oct. 23, 2025

For every following year, there is a little less radioactivity in newly formed cells, which means that they can be 'dated'.

From Science Daily • Nov. 21, 2024

As the reactors melted down at Fukushima Daiichi, workers in and around the plant took regular readings to determine how much radioactivity had escaped.

From "Meltdown" by Deirdre Langeland