In 1949, Dr. Harold E. Johns of the University of Saskatchewan sent a request to the National Research Council (NRC) asking them to produce Cobalt-60 isotopes for use in a cobalt therapy unit prototype.
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Two Cobalt-60 apparatuses were then built, one in Saskatoon in the cancer wing of the University of Saskatchewan and the other in London, Ontario.
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One was a young physicist from Canada, T Rockwell Mackie, who grew up in the town where Cobalt therapy, a form of radiation treatment, was developed; Minesh Mehta was the other.