Usage History of 'polonium'

The following chart shows how frequently 'polonium' appeared in printed materials over time. For example, the word 'polonium' occurred 2 times in books in 1685 and 5,104 times in 2008. From 1685 to 2008, the word 'polonium' was used a total of 185,994 times in books scanned by Google. See Reference: Google Ngram project.

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