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Comment: Halving thickness

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In reply to comment: sea water has particles (see in situ)

Halving thickness

It depends on what the particles are exactly and how concentrated they are at the surface. 7.2" of water halves gamma radiation; alpha and beta can't penetrate nearly as well. Only the surface contaminants are anywhere near dangerous. But they've had a year and thousands of miles of open ocean to disperse--the particles at least.