News: 10 times more internal exposure compared to direct inhalation

Cesium that has fallen and been disturbed from the ground surface- 10 times more internal exposure compared to direct inhalation – JAEA Analysis

Japan Atomic Energy Agency [JAEA] (Toukai Village, Ibaragi Prefecture) compiled analyses showing that the amount of internal exposure to radioactive cesium from particles that had landed on the ground once and then been disturbed and re-floated was 10 times larger than that of inhaling the airborne particles directly. [This study] will be presented on September 22nd at the Japan Atomic Power Conference that’s presently being held in Kitakyushuu City.

The JAEA Safety Research Center’s research fellow Kimura Masanori (Radiological Protection) points out that “an emphasis needs to be placed to prevent re-floating from the ground surface”.

Using the survey data of TEPCO and the Ministry of Education, Culture, Sports, Science, and Technology collected in Minamisouma City, Fukushima Prefecture, the amounts of internal exposure to Iodine-131, Cesium-134 and Cesium-137 caused by airborne particles (March 20-May 19) and that of re-floated particles (April 3-June 4) were calculated.

The result showed that the direct inhalation of Cesium-134 and -137 was 0.0076-0.0099 milliSv, which when compared to the re-floated particle inhalation of 0.077-0.09 milliSv, increased approximately 10 times. On the other hand, when Iodine-131, which has a shorter half life, was compared, the direct inhalation was 0.071 milliSv and the re-floated particle inhalation was 0.045 milliSv; no large difference was observed.

The half life of Cesium-134 is about 2 years; Cesium-137, about 30 years. Ground surface particles’ disturbance is expected to continue a long time. Kimura observes that “depending on the kind of radioactive materials, exposure pathways differ drastically.”

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Cäsium das am Boden landete und sich verteilte, verursacht eine 10-fach höhere innere Strahlenexposition als die direkte Inhalation – Analyse der JAEA

Die japanische Atomenergiebehörde JAEA (Toukai, Präfektur Ibaragi) stellte Analysen zusammen, die zeigen, dass die Menge der inneren Strahlenexposition durch radioaktives Cäsium aus Partikeln, die auf dem Boden gelandet sind und dann aufgewirbelt und verteilt wurden, 10 mal höher ist, als wenn man die Partikel direkt einatmen würde. Diese Studie wird am 22. September auf der japanischen Atomenergiekonferenz präsentiert, die im Moment in der Stadt Kitakyushuu abgehalten wird.
Der Fellow Masanori Kimura am Sicherheitsforschungszentrum der JAEA (Strahlenschutz) weist darauf hin, dass der „Schwerpunkt darauf gelegt werden muss, dieses Wiederaufwirbeln vom Boden zu verhindern“.
Aus den Untersuchungsdaten von TEPCO und dem Ministerium für ERziehung, Kultur, Sport, Wissenschaft und Technologie, aus der Stadt Minamisouma in der Präfektur Fukushima wurde die Höhe der inneren Strahlenexposition aus Iod 11, Cäsium 134 und Cäsium 137 durch Partikel in der Luft (20. März – 19. Mai) und aus den wiederaufgewirbelten Partikeln (3. April – 4. Juni) berechnet.
Das Ergebnis zeigt, das seine direkte Einatmung von Cäsium 134 und 137 0.0076-0.0099 milliSv ausmacht, im Vergleich dazu durch wieder aufgewirbelte Partikel 0.077-0.09 milliSv, also ungefähr 10 mal höher. Auf der anderen Seite Iod 131, das eine kürzere Halbwertszeit hat, und das bei direkter Einatmung 0.071 milliSv ausmacht und bei der Inhalation wieder aufgewirbelter Partikeln 0.045 milliSv; hier wurde kein so großer Unterschied beobachtet.
Die Halbwertszeit von Cäsium 134 ist ungefähr 2 Jahre; Cäsium 137 hat ungefähr 30 Jahre. Die Aufwirbelung von Partikeln vom Boden wird vermutlich lange Zeit anhalten. Kimura beobachtet, dass „sich die Expositionswege der Arten radioaktiven Materials stark unterscheiden“

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  1. Half-life is only so that half of the radiation is gone. You have every half-life multiplied by ten in order to have an idea when this radioisotope is gone from the biological environment. That would be in strontium and cesium 400 years.

    German Source: (Interview with Dr. Siedentopf of IPPNW Germany)


    The cesium is biological similar to the potassium and the human body can not distinguish between the good potassium and cesium.

    The body takes it on the breath and the food. You can not protect yourself.

    After intake, the cesium builds self into the body cells and destroys the energy balance of cells. It does not matter whether it consists of the liver, kidney or brain cells involved.

    These infected cell dies, after she pulls even before their neighbors suffer.

    hus begins a weird cycle:

    How life begins with a cell starts in this case the death. Children are more vulnerable because their cells divide constantly.

    As they grow, they need constant energy and constant need to cope with the damage to their cells.

    he adults at that time have survived 25 years and are now ill. In about 4 years we’re going to see the same with japanese children.

    Quiet Death.

    The then children are already suffering much earlier – often with fatal consequences.

    The cesium is present in the inheritance cells.

    Precarious, is that the cesium implants in the ovaries and the eggs of women. Because renew their loans, they are damaged for life.

    Although renewed in sperm, they also give more information to the injury during fertilization. Either, it can no longer be fathered children, or they get through father and mother misinformation in the future. The result you can not even imagine.

    The authorities in Japan had long ago have put women and children in the south of the country. Why they did not is, in my view, totally incomprehensible. There will be massive leukemia. This cesium cloud is a disaster for the Japanese, and from all other radionuclides, we know nothing.

    The body can not distinguish between Calcium and Strontium. If it is taken in through the food chain. It is built into the bones and teeth, shines there and hits the bone marrow, where sit the blood-forming organs: The stem cells that give rise to the red and white blood cells and platelets.

    These cells are damaged by Strontium, and indeed a lifetime, because the strontium remains where it is: irradiating with short and beta radiation.

    with kind regards,

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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.


September 2011