Friedrich Oskar Giesel
Friedrich Oskar Giesel was a German organic chemist. During his work in a quinine factory in the late 1890s he started to work on the atthattimenew field of radiochemistry and started the production of radium. In the period between 1902 and 1904 he was able to isolate a new element emanium. In a now controversially reviewed process it was stated that emanium is identical to actinium, which was discovered by AndrLouis Debierne in 1899.
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Source: Wikipedia