Cesium_illustration750_365373via WHOI.edu / November 10, 2014 / Monitoring efforts along the Pacific Coast of the U.S. and Canada have detected the presence of small amounts of radioactivity from the 2011 Fukushima Dai-ichi Nuclear Power Plant accident 100 miles (150 km) due west of Eureka, California. Scientists at the Woods Hole Oceanographic Institution (WHOI) found the trace amounts of telltale radioactive compounds as part of their ongoing monitoring of natural and human sources of radioactivity in the ocean.

In the aftermath of the 2011 tsunami off Japan, the Fukushima Dai-ichi Nuclear Power Plant released cesium-134 and other radioactive elements into the ocean at unprecedented levels. Since then, the radioactive plume has traveled west across the Pacific, propelled largely by ocean currents and being diluted along the way. At their highest near the damaged nuclear power plant in 2011, radioactivity levels peaked at more than 10 million times the levels recently detected near North America.

“We detected cesium-134, a contaminant from Fukushima, off the northern California coast.  The levels are only detectable by sophisticated equipment able to discern minute quantities of radioactivity,” said Ken Buesseler, a WHOI marine chemist, who is leading the monitoring effort. “Most people don’t realize that there was already cesium in Pacific waters prior to Fukushima, but only the cesium-137 isotope.  Cesium-137 undergoes radioactive decay with a 30-year half-life and was introduced to the environment during atmospheric weapons testing in the 1950s and ’60s.  Along with cesium-137, we detected cesium-134 – which also does not occur naturally in the environment and has a half-life of just two years. Therefore the only source of this cesium-134 in the Pacific today is from Fukushima.”

The amount of cesium-134 reported in these new offshore data is less than 2 Becquerels per cubic meter (the number of decay events per second per 260 gallons of water). This Fukushima-derived cesium is far below where one might expect any measurable risk to human health or marine life, according to international health agencies.  And it is more than 1000 times lower than acceptable limits in drinking water set by US EPA.

Scientists have used models to predict when and how much cesium-134 from Fukushima would appear off shore of Alaska and the coast of Canada. They forecast that detectable amounts will move south along the coast of North America and eventually back towards Hawaii, but models differ greatly on when and how much would be found.

“We don’t know exactly when the Fukushima isotopes will be detectable closer to shore because the mixing of offshore surface waters and coastal waters is hard to predict. Mixing is hindered by coastal currents and near-shore upwelling of colder deep water,” said Buesseler. “We stand to learn more from samples taken this winter when there is generally less upwelling, and exchange between coastal and offshore waters maybe enhanced.”

Because no U.S. federal agency is currently funding monitoring of ocean radioactivity in coastal waters, Buesseler launched a crowd-funded, citizen-science program to engage the public in gathering samples and to provide up-to-date scientific data on the levels of cesium isotopes along the west coast of North America and Hawaii. Since January 2014, when Buesseler launched the program, individuals and groups have collected more than 50 seawater samples and raised funds to have them analyzed. The results of samples collected from Alaska to San Diego and on the North Shore of Hawaii are posted on the website http://OurRadioactiveOcean.org. To date, all of the coastal samples tested in Buesseler’s lab have shown no sign of cesium-134 from Fukushima (all are less than their detection limit of 0.2 Becquerel per cubic meter).

The offshore radioactivity reported this week came from water samples collected and sent to Buesseler’s lab for analysis in August by a group of volunteers on the research vessel Point Sur sailing between Dutch Harbor, Alaska, and Eureka, California. These results confirm prior data described at a scientific meeting in Honolulu in Feb. 2014 by John Smith, a scientist at Fisheries and Oceans Canada in Dartmouth, Nova Scotia, who found similar levels on earlier research cruises off shore of Canada. Buesseler and Smith are now working together on a new project, led by Jay Cullen at the University of Victoria, Canada, called InFORM (http://fukushimainform.wordpress.com/) that involves Canadian academic, government and NGO partners to determine and communicate the environmental risks posed by Fukushima for Canada’s Pacific and Arctic coasts and their inhabitants.

Buesseler believes the spread of radioactivity across the Pacific is an evolving situation that demands careful, consistent monitoring of the sort conducted from the Point Sur.

“Crowd-sourced funding continues to be an important way to engage the public and reveal what is going on near the coast. But ocean scientists need to do more work offshore to understand how ocean currents will be transporting cesium on shore.  The models predict cesium levels to increase over the next two to three years, but do a poor job describing how much more dilution will take place and where those waters will reach the shore line first,” said Buesseler. “So we need both citizen scientists to keep up the coastal monitoring network, but also research vessels and comprehensive studies offshore like this one, that are too expensive for the average citizen to support,” said Buesseler.

Buesseler will be presenting his results on Nov. 13, 2014, at the SETAC conference in Vancouver (http://meetings.setac.org/frontend.php/presentation/listForPublic ). He is also responding to questions from the public on the “Ask Me Anything” forum on Reddit at 1 p.m. EST on Nov. 10 (http://www.reddit.com/r/science).

SOURCE: Woods Hole Oceanographic Institution

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By Broc West| 5 Comments | Featured, News



    As news came out about yet another finding of Fukushima radioactive contamination offshore of North America, TEPCO published a rather bizarre press release.

    The corporate statement insists the contamination “Level raises no concern for human or animal health”. This is a bit like taking healthy food advice from McDonalds.

    They go on to misrepresent statements made by Woods Hole for their own purposes including one twisted to try to claim cesium doesn’t contaminate fish. This is obviously untrue.

    Statements demanding people adopt an idea about public or personal safety usually don’t come from a company. Even less often from the company that did the damage. More rare when it comes from a foreign company trying to bully the US public the way they have done so to the Japanese public. TEPCO’s actions have not gone over well in Japan, they have even less of a chance of success with the US public.

    No matter how TEPCO tries to spin it, they have contaminated not just Japan, but the Pacific and their unwanted gift is arriving on North American shores.

    Link – http://www.tepco.co.jp/en/press/corp-com/release/2014/1243939_5892.html

    • yeah! Someone who sees through the BS that Tepco is spewing out, just slightly less toxic than what they cannot seem to stop spewing out of Fukushima. The public just doesn’t seem to understand the gravity of this situation. The mass media has done an incredible job of suppressing this information. Of course, if this was on the news the public would start to worry. At the end of the day I think the reason is that the governments of Japan, US and Canada are scratching their collective heads as they haven’t a clue what to do. This is an extinction event for the flora and fauna of the Pacific Ocean but as radiation takes time to do its dirty work, the industry will be able to disavow responsibility. Folks on the west coast of BC and the US – stop eating fruit and vegetables unless zeolite has been used on the ground to stop the uptake of radiation and stop eating anything out of the ocean.

      • Liz,
        Just to clarify.. the initial explosions during the meltdown released some materials into the atmosphere that were carried by the jetstream across the world and presumably, into the soil. The ongoing leakage of contaminated water into the Pacific Ocean is the major catastrophy as far as I can tell.

        Are you saying that the West Coast of the US and Canada have been contaminated via the atmosphere on par with the what is going on in the sea?

        That is not proving out in the least and is grossly exaggerated. Where are the mass -deaths of small land/air animals who are more greatly affected by tiny doses?

        There is no doubt the Ocean Environment will be affected badly, but I suggest you keep a lid on your emotions and deal with fact rather than hysteria.

  2. Crowd-sourced funding is a good step, but it is alone not enough for controlling hazardous effects, if present, in Fukushima. Government, citizen scientists and common citizen must work in a synchronized way for this.

  3. No amount of cover up can conceal the obvious.
    I recently created a petition to ask that Japan keeps its nuclear reactors turned off. It would be good if any of you reading this could share it.
    Please look for Care2 Tell Japan to Keep the Nuclear Reactors Off

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