the staff at Princess Margaret Hospital in Toronto had decided to... measure all doses of radiation in the beam and, in a fraction of a second, stop excessive d

the staff at Princess Margaret Hospital in Toronto had decided to... measure all doses of radiation in the beam and, in a fraction of a second, stop excessive doses before they could reach the patient Astonishing this basic safety precaution was not already in use. Do modern devices do this? I guess nobody thought about Murphy's Law.