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Japan Radiation Test Results – 4th Round
We’ve tested our seafood for a concerning radionuclide, with reassuring results
1/9/2014By Craig Weatherby
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We're pleased to once again announce reassuring radiation-test results.

This time, our tests detected no strontium-90 (Sr-90), which is an especially concerning radionuclide.

We tested our seafood three times before, looking for the radionuclides released in the greatest amounts from the Japanese nuclear plant: cesium-134, cesium-137, and iodine-131.

Every time, the tests found either no detectable levels, or amounts barely above the detectable levels, in completely safe concentrations normally found in wild seafood.


Last summer, the first reports appeared suggesting that a longer-lived radionuclide called strontium 90 (Sr-90) was leaking from the stricken nuclear plant.

So to ensure safety, we sent more fish to be tested for Sr-90, in the fall of 2013.

We've now received the results from SGS North America laboratories ... and they proved just as reassuring as our prior tests for cesium and iodine radionuclides.

No strontium 90 found
We sent samples of King Salmon, Sockeye Salmon, and Albacore Tuna to SGS Laboratories to be tested for Sr-90, because those species migrate the furthest west toward Japan.

None of these fish habitually migrate further west than one thousand miles east of the nuclear plants, and usually stay much further away. 

However, Sr-90 would be more concentrated in currents flowing from northeastern Japan (the area of the leaks) to the U.S. and Canadian West coasts, so testing for Sr 90 seemed prudent.

The consensus scientific view has been that the radiation leaked from Japan poses no risks to consumers of seafood that (like our species) do not migrate close to Japan.

And our latest test results, which detected no Sr-90, support those expert scientific estimates.

Our test results are available upon request.

About strontium-90
Along with cesium-137, Sr-90 is one of the more dangerous radionuclides, because it has a long half-life of 30 years, and can accumulate in bone.

The main sources of Sr-90 in the ocean have been fallout from atmospheric nuclear tests in the 1950s and 1960s. 

The Fukushima Dai-ichi accident and the amounts released from March to June, 2011 produced less than a one percent increase in ocean levels of this radioisotope.


Sources
  • Universitat Autònoma de Barcelona. The Fukushima accident raised levels of radioactive strontium off the east coast of Japan by up to a hundred times. June 11, 2013 http://www.alphagalileo.org/ViewItem.aspx?ItemId=131949&CultureCode=en 
  • N.Casacuberta, P.Masqué, J.Garcia-Orellana, R.Garcia-Tenorio and K.O.Buesseler. Sr-90 and Sr-89 in seawater off Japan as a consequence of the Fukushima Dai-ichi nuclear accident. Biogeosciences. http://www.biogeosciences-discuss.net/10/2039/2013/bgd-1
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