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Radiation technicians Nancy Brown, right, and Isabelle Nauer illustrate the use of the Cobalt “bomb” machine at Montefiore, Hospital in New York on Feb. 7, 1953, as the new therapy unit makes its bow. Miss Nauer wears a plaster cast of the type moulded on a patient�s head in a brain tumor case. After conventional x-rays locate the tumor, the cast is marked so that the Cobalt unit can be directed at the same point during each treatment. The �bomb� came from Canada�s Chalk River Atomic Energy pile and produces more radiation than all the world�s medically used radium. (Photo by AP Photo/JR)
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