Comment: Halving thickness

In post: 'Ghost ship' off Canada heralds arrival of tsunami debris

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

Halving thickness

Submitted by Bobsama on Tue, 03/27/2012 - 20:59. Permalink

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.

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