In 1896 by Henri Becquerel when he worked on uranium.
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Eleni Bakola
answered on 13 Jul 2023:
last edited 13 Jul 2023 9:16 am
I second Bruno’s answer. Also, the start for radiotherapy to begin happened when Roentgen in 1895 discouvered X-rays and in the 1896 year they used X-rays as a mean to reat cancer
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