Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
In an earlier thread, I referred to the relevant international agreement. Its currently valid limits date from 1990, the US limits are set by those, Japan's limits are lower, and were still lower until days ago (100 mSv for emergency workers).

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Thu Mar 17th, 2011 at 10:14:23 AM EST
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