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R____________
Definitions
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
Word origin
From radioactive + -ity or radio- + activity.
Used in a sentence
“Today, no one would intentionally smear radioactive materials on their face, but in 1933, the dangers of radioactivity were not yet fully understood.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
No curated clues for radioactivity yet.