That's a good question, I don't know enough to answer. I suppose one way to mitigate the risk is to use the same kind of "emergency escape" systems that humans

That's a good question, I don't know enough to answer. I suppose one way to mitigate the risk is to use the same kind of "emergency escape" systems that humans use during rocket launches. I.e. if the rocket fails to achieve orbit, a capsule is ejected and floats down on parachutes. I wonder if that sort of thing is already done with RTG launches?