I know it sounds funny, but overdosing radiation is not as uncommon as one thinks it is. I remember reading about several such incidents over the past few years.
I would suggest a big read-out indicating the strength of the radiation, with a proper demarcation of the safe limits.
Articles like this are scary to me. My daughters were very sick when they were 6 weeks old, and they had CT scans (along with tons of other tests).
They are 13 now, and I wonder if there will be some other scary side effect that we are not aware of.