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So they have established a baseline?

Fukushima has been pouring hundreds of tons of contaminated water into the ocean every day for 3 years now and if the waste has arrived at North America, this is only the leading edge. The concentration must go up from here because of the continuous dumping that has already occurred (continues to migrate from Fukushima to North America) and daily dumping of contaminated water that will continue to occur for many years (duration uknown - there is no known fix for this problem). So it’s too soon to say “it was sufficiently diluted” because so much of what has already been dumped into the ocean has not made it across the Pacific yet. Also, because even small amounts of exposure to radiation increases risk of serious illness by small amounts. I don’t feel celebratory.

Relax, get a cold one out of the fridge, a bowl of your favorite snacks or comfort food and sit in your easy chair and exhale.

I've had at least 3 of the heart scans mentioned by "nvscanman" in comment #9. If we round UP the seawater concentration from 0.9/m3 to 1 per cubic meter, you would have to drink a cubic MILE of that seawater to get the same exposure I've had from those three scans.

You will surely die, some day of some cause. There is no possibility that it will be because of contaminated seawater from Fukushima. On the other hand, if you roast and eat a sea lion from the West Coast every day, that may kill you... by obesity, with a slight, "glow-in-the-dark" side effect.

One thing that is hard to grasp is how much water is contained in the Pacific Ocean. A cubic meter of seawater weighs about 2,200 lbs. Close enough to a ton to simplify things. Assuming 500 tons per day for 3 years, this is roughly 550,000 cubic meters of water since the event. Changing this to cubic kilometers (÷ 3000) gives you about 184 cubic kilometers over 3 years. The volume of the Pacific is about 660,000,000 cubic kilometers, leading to a concentration of about 0.00000028%.

Even if you posit that only 1/10,000 of the Pacific is affected, this leads to Fukushima contaminated water making up 0.028%of the total volume.

The original Daily Kos article was actually quite informative. Cs-134 is not much of a worry as its half-life is ~2 years, which means that about 75% has decayed to non-radioactive barium in the subsequent 3 years. Cs-137 is a bigger worry as it has a half-life of about 30 years.

Combine this with the average 14Bq/L as background radiation (due to naturally occurring radiation as well as hundreds of nuclear bomb tests conducted by the US and France in the south Pacific), the Daily Kos author's conclusions seem pretty reasonable.

My personal opinion is that you are putting your life more at risk by eating garlic imported from China than by eating any fish you get from the ocean.