AP

Physicists from the federal Radiological Physics Center detected the error on March 7, but the H. Lee Moffitt Cancer Center & Research Institute didn't acknowledge it until Friday.
Officials said 77 patients were affected. Twelve have since died.
"Some people were having side effects, but overall, they were within the normal range of side effects of radiation treatments," said the center director, Dr. William Dalton. "We aren't seeing unanticipated levels of side effects."

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