There were various reports in the late 1800s, after radiation was discovered, of pain or irritation after exposure to radiation, but those were often attributed to stress, strain, or mishandling of experiments. The first experiment done to determine its harmfulness was done by Elihu Thomson in 1896. He put his small finger in an x-ray tube for half an hour a day for many days and the results were the same as the reports: he had pain and swelling. It was not commonly accepted that radiation was dangerous at first, but by 1900 most scientific communities could not deny that radiation is harmful.
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