Um, that's 2 grams of tritium in 1.25 million tons of water. Do the math. It's less "contamination" than is permitted in domestic water supplies.2 gms of tritium? The article is talking about 1.25 million tonnes of contaminated water.
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I am no expert on dilution of fluids etc and you may be right to call bullshit, equally I call bullshit on a Japaneses government that simply wants to get rid of the problem by flushing it into the sea while it appears they are being less than honest about exactly what's being flushed into an ocean. An ocean that is shared by many.
Calling bullshit on the Japanese because they're engaged in a coverup for expedience is also bullshit. Many international nuclear regulatory agencies are closely monitoring Japan's plan to discharge the water into the ocean and agree it's going to be harmless. I assure you Japan is being completely honest and transparent. Note that removing other more serious radionuclides from the effluent is going to cost Japan many billions and may take twenty years of effort. They're 'fessing up and doing the right thing at great expense.
I'd suggest you relax about future Fukushima emissions and concentrate on plastic pollution, overfishing, etc., if you're really interested in human caused ocean degradation.