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Radioactive
1983 Russian radioactive satellite falls into Indian Ocean 1951 1st battery to convert radioactive energy to electrical announced 1936 1st radioactive isotope medicine administered, Berkeley, California 1936 1st radioactive substance produced synthetically (radium E) 1902 Marie and Pierre Curie isolate radioactive element radium 1902 Marie and Pierre Curie isolated the radioactive element radium

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