Tepco been mis-analyzing Strontium-90 in contaminated water and seawater for 2.5 years since 311

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Related to this article.. 5,000,000,000 Bq/m3 of Strontium-90 measured from groundwater last July / Tepco not announced for half a year [URL]


On 2/7/2014, Tepco finally admitted that they mis-analyzed all the samples for Strontium-90 from 311 to October of 2013.

Fukushima Diary has been warning of the possible error about their radiation measurement since last August. (cf, NRA “Tepco’s nuclide analysis may have a significant error” [URL])


Tepco states it is because the sensor of measurement instruments can’t detect all the radiation when the sample is too contaminated. They comment that the error of the readings become bigger when Strontium-90 density is over a few 100,000 Bq/L. It means especially the highly contaminated groundwater and seawater samples were underestimated.


Importantly, Tepco said it might not be only Strontium-90, but also Cesium-134/137 analysis might be wrong.

Tepco is going to re-analyze the past samples but most of the old ones are already abandoned. Also, the number of samples to re-analyze is enormous. They can’t even estimate when they complete the re-analysis.


One month ago, Fukushima Diary wrote the potential effect of the un-admitted mis-measurement of Tepco. (cf, [Column] Will Tepco admit their mistake in radiation analysis ? [URL]) We need to upgrade our recognition about Fukushima situation and sea contamination. It is worse then reported ever.





If you are from the international mass media, Don’t read this site before having a contact with me.


Français :

A partir de mars 2011 et pendant 2 ans et demi Tepco a donné des résultats faux sur le strontium 90
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Les virements mensuels sont très appréciés.


Article lié : 5 milliards de Bq/m³ de strontium 90 dans les eaux souterraines en juillet dernier : Tepco n’en a rien dit pendant 6 mois

Le 7 février 2014, Tepco a finalement reconnu qu’ils se sont trompés dans leurs analyses de tous leurs échantillons pour le strontium 90 entre mars 2011 et octobre 2013.

Le Fukushima Diary prévient de la possibilité d’erreur dans leurs mesures de la radioactivité depuis août dernier. (cf. NRA : “Les analyses de radioactivité de Tepco peuvent comporter de graves erreurs”)

Tepco affirme que c’est parce que la sonde des instruments de mesure ne détecte plus toute la radioactivité quand l’échantillon est trop contaminé. Ils déclarent que l’erreur de lecture est plus forte lorsque le strontium 90 passe un peu au-dessus de 100 000 Bq/L. Ça signifie en particulier que les relevés sur les eaux souterraines et marines ont été systématiquement sous-estimées.

Plus important, Tepco déclare que ça pourrait ne pas concerner que le strontium 90 mais que les analyses des césium 134/137 pourraient être fausses aussi.
Tepco va ré-analyser les échantillons mais la plupart des plus anciens ont déjà été éliminés. De plus, le nombre d’échantillons à réanalyser est énorme. Ils ne peuvent même pas dire quand ils auront fini de tout réanalyser.

Il y a un mois, le Fukushima Diary décrivait les effets probables de la dénégation par Tepco de ses erreurs de mesure. (cf. [Édito] Est-ce que Tepco va reconnaître s’être trompé dans ses analyses de la radioactivité ?) On doit  maintenant réévaluer notre prise en compte de la situation à Fukushima et sur la contamination marine. C’est pire que tout ce qui n’en a jamais été dit.


Note : Si vous êtes de la grande presse internationale, ne lisez pas ce site sans avoir préalablement pris contact avec moi.

  1. An interesting Book Review:

    The burden of knowing too much is all too evident in ‘Silence Deafening, Fukushima Fallout … A Mother’s Response’- by Kimberly Roberson. A person can do two things with this burden: they can choose to ignore what they know and go about life as it is now, or they can ACT. Roberson has chosen to act because not doing so was unconscionable to her.

    This is clear in her well-researched and passionately written book which seeks not only to share important knowledge of radiation contamination in the wake of the Fukushima nuclear catastrophe in Japan, but also to convince people knowledge is power, they do have a voice and can take action to protect themselves and the ones they love.

  2. Official lack of testing profoundly negligent

    http www coastreporter net/ (article/20140207/SECHELT0302/302079967/-1/SECHELT/official-lack-of-testing-profoundly-negligent) Home » Opinion » Editorial – Off the beach – February 7, 2014 – John Gleeson/Staff Writer

    I felt pretty good Tuesday evening after getting off the phone with Robin Brown, head of the ocean sciences division of the federal Department of Fisheries and Oceans, based in Sidney, B.C. He said Health Canada was doing some testing on marine life for radiation levels, measuring concentrations in fish. That’s what First Nation leaders are calling for, and I thought it was a positive development.

    The next day I tried tracking down the Health Canada contact that Brown gave me, who is the director of the department’s Radiation Protection Bureau in Ottawa. Instead of getting a scientist, I got a communications officer, who redirected me to the Canadian Food Inspection Agency. There, another communications officer responded with an emailed statement that said Canada has not been testing marine life for radiation since early 2012 because “it is not required.”

    After hearing from Brown that Fukushima radiation was first detected in B.C. coastal waters in June 2013, the lack of testing — or official lack of testing — seemed profoundly negligent. A lot of my good feelings vanished. And the more I thought about Brown’s sanguine attitude, the less convinced I became. It’s all about data. But how good is the data? It took Japan’s power company about two months to admit that three reactors had melted down in March 2011 and more than two years to admit that radioactive water had been flowing into the Pacific on a daily basis.

    The data often seems to be behind the times and severely understated. That’s why Canada’s government owes it to the citizens of this country to provide the most accurate data that’s out there, perform rigorous testing and be transparent about the results. Every Canadian should back B.C.’s First Nation leaders on this one.

  3. I presume, based upon deliberate government withholding of empirical data …

    1) That dangerous, radionuclide-contaminated foods and beverages are entering the North American food supply in large quantity.

    2) That political and regulatory officials in Mexico, Canada and the formerly united states of America are receiving ‘political contributions’, bribes, threats and other inducements to allow this extremely dangerous practice.

    And I select my food and drink accordingly.


    Bill Duff

  4. Information management 101

    1. Don’t do the measurements.

    2. If you must do the measurements fudge the figures, if necessary blaming faulty equipment.

    3. Don’t release the data.

    4. If you must release the data do it as late as possible, too late to qualify as news.

    5. Release unflattering data slowly, drip by slow drip, so that only fringe sites like Fukushima Diary will pick up on it.

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About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


February 2014