C POWELL, P. FOWLER & D. PERKINS / SCIENCE PHOTO LIBRARY C POWELL, P. FOWLER & D. PERKINS / SCIENCE PHOTO LIBRARY
Radium alpha particles. Coloured image of the radioactive emission of alpha particles from radium. A speck of radium salt was placed on a special emulsion on a photographic plate; when developed, the emulsion reveals the yellow tracks of alpha particles emitted by the radium. Radium is the most powerful radioactive substance known; it emits radiation a million times more intensely than uranium. It was discovered by the French scientists Marie and Pierre Curie in 1898.
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