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A bird's eye view of the distribution of tritium in the North Atlantic. Picture yourself floating a few hundred miles above Norway, looking southwestward down at the North Atlantic. North America is in the top right corner of the view, Greenland to the lower right, and parts of Europe, Great Britain, and Africa are visible on the lower left. The spikes are ocean islands. The blue "blanket" is the 1 Tritium Unit isosurface (surface of constant tritium measured in 1981).
(One Tritium Unit equals one tritium atom to 1018 hydrogen atoms.) Underneath this blanket lies water that has not been appreciably ventilated (in contact with the atmosphere) while water above this level has been ventilated since the 1960s[back]
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