Ibaraki prefecture doesn’t check Tritium in swimming beach seawater lower than 20,000 Bq/m3

Ibaraki prefectural government doesn’t test Tritium density in seawater if it’s lower than 20,000 Bq/m3.

They are going to open its 18 swimming beaches late in July though these beaches are located in the lower reaches of a sea current from Fukushima plant, which still keeps leaking highly contaminated water.

In all of 4 times tests, Ibaraki prefecture set the lowest detectable level of Tritium in seawater as 20,000 Bq/m3, which is 20 times much as Cesium-134/137 for some reason. When the reading was lower than that level, they announced only “ok” without mentioning the detailed analysis result.


See also.. Highest density of All β and Cs-134 measured from groundwater near Reactor 2 [URL]





You read this now because we’ve been surviving until today.


Français :

Dans l’eau de mer des plages, la préfecture d’Ibaraki ne contrôle pas le tritium à moins de 20 000 Bq/m³


La préfecture d’Ibaraki ne contrôle pas le tritium quand il y en a moins de 20 000 Bq/m³.

Ils vont ouvrir leur 18 plages à la baignade fin juillet bien que ces plages soient situées en marge du courant marin venant de la centrale de Fukushima qui continue de fuir ses eaux extrêmement radioactives.
Sur ses 4 contrôles, la préfecture d’Ibaraki a configuré le plus petit niveau détectable du tritium de l’eau de mer à 20 000 Bq/m3, soit 20 fois celui du césium 134/137. Lorsque les relevés ont été en-dessous de ce niveau; ils ont simplement écrit “ok” sans préciser le résultat exact de l’analyse.

Article lié : Record de radioactivité β et Cs-134 dans les eaux souterraines du réacteur 2


Vous pouvez lire ceci parce que nous avons survécu jusqu’à aujourd’hui.

  1. The ingestion Total Effective Dose Equivalent (TEDE) is

    1.35e-2 microSv/Bq for Cesium-137
    1.68e-5 microSv/Bq for tritium

    So if one of our swimmers drank a cubic meter of seawater* they would get a dose of;

    1.35e-2 microSv/Bq * 1000 Bq/m3 = 13.5 microSv from Cesium-137 and
    1.68e-5 microSv/Bq * 20000 Bq/m3 = 0.336 microSv from tritium

    So we can see that a limit of 20000 Bq/m3 of tritium is already ridiculously conservative and there’s no need to spend the time and effort to try to measure anything lower than that.

    For comparison you pick up about 2-3 microSv per day from natural gamma background.

    Congratulations Ibaraki Prefectural Government. You’re doing an excellent job of keeping beach goers safe from radiation.

    *Of course, if they drank a cubic meter of seawater it would kill them instantly regardless of any radioactive contamination so that’s quite conservative.

    1. You have neglected the chemical toxicity of tritium, again.
      Why not put your money where your mouth is and grab 5 tritium EXIT signs, break the glass and breath deep, if it is so safe? (obviously i do not advise anybody doing this)
      Oh yeah, that’s right, nobody in their right mind wants to risk suffering horribly and then die. That resonates with me, how about you?

      Also note that in addition to the Beta(-) decay, the 3-He decay product starts out ionized and will fervently rip out it’s s-shell’s needed electron from wherever it can to complete that shell.

      Therefore, each decay does not simply produce one ionization, but two (& an electron neutrino). The kinetic energy of the beta- decay ranges from 5.6 keV, to a maximum of 18.59 keV.

      3H→3He+ + e− + ̄νe

      http ://frhewww.physik.uni-freiburg.de/SideBar/l5_Lectures/SS2011/Uebungen/UebungenLoesungen/Uebungen_07_SS2011-ExIV-HELM.pdf

      Let us not forget as well that with it’s low energy beta decay, all decays most likely end within living tissue if internalized.

      *Of course, if a cubic meter of seawater fell as a solid block of ice, it would fucking hurt at minimum and at maximum kill by death most tragic, regardless of radiocontamination.

      1. I usually ignore “effects” that have no science behind them.

        I do not break open tritium sit signs and ingest them because they contain at least 67 billion Bq of tritium and that would give you a dose of 1 Sv. Enough to give you acute radiation poisoning although you would have an excellent chance of recovery. Enough to raise your lifetime risk of dying from cancer by 6%. Sounds like an extremely poor idea to me.

        It takes a couple of eV to ionize an atom. So your 5.6 keV beta is going to leave a trail of a couple of thousand ionizations as it travels making the extra ionization from the residual helium atom irrelevant.

        All internal beta decays pass through living tissue.

  2. Radiation Damage is Cumulative,
    Children are more susceptible,
    Radiocesium & to some extent radiostrontium are absorbed through the skin …

    http ://pubchem.ncbi.nlm.nih.gov/toc/summary_toc.cgi?tocid=332&sid=11533842

    Demonstration of /skin/ absorption of cations such as … strontium … was made with isotopes. … Strontium is similar to calcium in its chemical reactions, and it is stored tenaciously in bone … /Strontium, NOS/

    Demonstration of /skin/ absorption of cations such as … strontium … was made with isotopes. … Strontium is similar to calcium in its chemical reactions, and it is stored tenaciously in bone … /Strontium, NOS/

    Support Nuclear Power … by killing your children …

  3. You seem to think that as soon as you immerse yourself in the water the “Jaws” theme starts playing and the isotopes start swimming toward you to burrow their way through your skin.

    They don’t.

    Even if there was significant skin absorption your internal isotope concentration wouldn’t rise any higher than what was in the water. It would still be a trivial dose.

    1. Children Playing in the Sand

      The LARGER HAZARD, from cesium skin absorption, arises from CHILDREN playing in the sand.

      Sand Castles of Death

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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.


July 2014