NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
William Ramsay (1852-1916), Scottish chemist demonstrating the transmutatoin of radium to helium to the French chemist and co-discoverer of radium Pierre Currie (1859-1906). This transmutation is actually the release of a helium nucleus during radioactive decay.
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