Usage History of 'irradiations'

The following chart shows how frequently 'irradiations' appeared in printed materials over time. For example, the word 'irradiations' occurred 2 times in books in 1649 and 1,633 times in 2008. From 1649 to 2008, the word 'irradiations' was used a total of 124,191 times in books scanned by Google. See Reference: Google Ngram project.

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