Inventor of the 'cobalt bomb,' a nuclear radiation device that revolutionized the treatment of cancers located deep in the body, where previous radiation therapies had proven ineffective. Over seven million people worldwide have benefited from cobalt-60 therapy. Johns wrote The Physics of Radiation Therapy in 1953 and The Physics of Radiology in 1961 (4th edition 1983). He held a number of patents for the design of Cobalt 60 units for treatment of cancer, and he helped establish the department of medical biophysics at the University of Toronto.
Sources: Canadian Who’s Who 1993, Canadian Light Source Inc.
Photo: Canadian Light Source Inc.
- July 4, 1915
- Chengtu, West China
- Date of Death
- August 24, 1998
- Place of Death
- Kingston, Ontario
- Biophysicist; Professor of Medical Biophysics
- University of Toronto
- BA McMaster University, 1936
- MA University of Toronto, 1937
- PhD University of Toronto, 1939
- Roentgen Award of the British Institute of Radiology, 1953
- Gairdner International Award, 1973
- W.B. Lewis Award of the Canadian Nuclear Society, 1985
- Last Updated
- September 17, 2015
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