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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

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

From The Wall Street Journal • Oct. 28, 2025

He also said there was radiological and chemical contamination at the site, but that the level of radioactivity outside had remained unchanged and at normal levels.

From BBC • Jun. 16, 2025

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

From Los Angeles Times • Dec. 2, 2024

He discovered it was ten times as high as it was in the open air: apparently the metal body, reflecting the radioactivity inward from six directions, concentrated the rays more than anyone had anticipated.

From "Z for Zachariah" by Robert C. O’Brien