Usage History of 'irradiators'

The following chart shows how frequently 'irradiators' appeared in printed materials over time. For example, the word 'irradiators' occurred 2 times in books in 1748 and 317 times in 2008. From 1748 to 2008, the word 'irradiators' was used a total of 7,534 times in books scanned by Google. See Reference: Google Ngram project.

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