Which is exactly why they're telling Americans not to take any KI now.

We'd be better off declining that next CT scan that the doctor wants to do "just to be sure". Actually, Americans already get a lot more radiation compared to other countries because we're going kind of bonkers over high energy diagnostic tools like CT scans over the years. That's primarily why the average Australian gets like 2 mSv of radiation a year while the average for an American is something like 6 mSv. We're already awash in radiation compared to what people are experiencing in Tokyo right now.