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Dorn, Friedrich Ernst 1848-1916
German chemist

Born in Guttstadt, East Prussia, he was educated at Königsberg, taught physics at Darmstadt and Halle. In 1900 he noticed that radium apparently becomes less radioactive if swept with a current of gas. This led him to the discovery of a radioactive gas which is emitted by radium as part of its decay processes. He called it 'niton' but it is now known as radon.