Usage History of 'radioactivity'

The following chart shows how frequently 'radioactivity' appeared in printed materials over time. For example, the word 'radioactivity' occurred 2 times in books in 1713 and 34,054 times in 2008. From 1713 to 2008, the word 'radioactivity' was used a total of 2,299,018 times in books scanned by Google. See Reference: Google Ngram project.

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