Wouldn't you?
All the major companies and international businesses are pulling their people.
You betcha I would if I could.
No.Atmospheric gasses have an extremely short half life when radiated.
Were I on the Gulf coast in the path of a hurricane, I would get to a shelter. The science here though is like the science in global warming - countered by what you were supposed to learn in school but probably flushed from your mind by the end of the next semester.
There is vastly more danger in Japan right now from diseases born in the rotting rubble from the tsunami than there is from nuclear radiation unless you are actually in one of the power plants.
Some people will fall for one socialist inspired environmentalism scheme after another no matter how simple it is to counter intellectually.
I am not one of them, and I will ridicule those who are.
I might be sarcastic enough to bring it up again 5 years later when they look damned stupid.