Nuclear medicine in middle-income countries has almost certainly saved orders of magnitude more people than it's killed. Even the specific source in the Goiâni

Nuclear medicine in middle-income countries has almost certainly saved orders of magnitude more people than it's killed. Even the specific source in the Goiânia accident could easily have been responsible for saving more lives than it ended up taking. Of course these things have risks. But these radiotherapy sources aren't being used for fun; the benefits are substantial. That an accident that killed 4 people is significant enough to get its own name and Wikipedia article suggests to me that the risk isn't actually that high.