Usage History of 'plutonium'

The following chart shows how frequently 'plutonium' appeared in printed materials over time. For example, the word 'plutonium' occurred 4 times in books in 1712 and 30,918 times in 2008. From 1712 to 2008, the word 'plutonium' was used a total of 1,329,981 times in books scanned by Google. See Reference: Google Ngram project.

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