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In 1811, Bernard Courtois accidentally discovers iodine during an unsuccessful attempt to manufacture gunpowder.
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Radioiodines first produced by Enrico Fermi in 1934
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Officially discovered by Glenn Seabourg and John Livingood at University of California, Berkeley
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Joseph Gilbert Hamilton, Mayo Soley and Robley Evans published the first paper on the diagnostic uses of iodine-131 in patients
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Mass-production of nuclear reactors after 1942 enabled scientists to develop radioisotopes like iodine 131 in more amounts
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The first recorded medical use of iodine-131 was in 1946 when it was administered to treat thyroid cancer
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Further research conducted in 1955 revealed that iodine 131 could be used to treat liver problems and malignant melanomas