25,400 Bq/Kg of Cs-134/137 from cedar male flower of 2014 / The Forestry Agency “Reduced to only 10% of 2011”

In the end of this January, the Forestry Agency announced they measured 25,400 Bq/Kg from cedar male flower in Fukushima prefecture.


Every Spring, cedar pollen is blown to the densely populated area such as Tokyo. The government of Japan have tested Cesium-134/137 density of cedar male flowers in order to study the internal exposure caused by radioactive pollen since 2011. The samples are taken in Fukushima prefecture.


As result of the latest survey implemented last November, the highest density was 25,400 Bq/Kg, the second highest density was 20,500 Bq/Kg. Both of the samples were taken in Futaba county, and atmospheric dose was 3.8 〜 24.9 μSv/h.


The Forestry Agency comments this is only 10% of 2011’s reading. Actually their data show the Cs-134/137 density was 125,000 〜253,000 Bq/Kg in 2011, which is extremely high.

However, they announce the possible hourly exposure dose from radioactive pollen would have been only 0.0000215 〜 0.000192 μSv/h, which is not harmful enough.








Français :

25 400 Bq/kg de Cs-134/137 dans des fleurs de cèdre mâle de 2014 / Agence Forestière :  “10 % de 2011 seulement”


A la fin de janvier dernier, L’agence Forestière a déclaré avoir relevé 25 400 Bq/kg dans des fleurs de cèdre mâle de la préfecture de Fukushima.

Tous les printemps, le pollen des cèdres est emporté par le vent sur des régions très peuplées comme celle de Tokyo. Depuis 2011, le gouvernement japonais contrôle la radioactivité du Césium 134/137 dans les fleurs mâle pour étudier l’exposition interne provoquée par le pollen radioactif pollen. Les échantillons sont pris dans la préfecture de Fukushima.

Le record de leur dernière exploration de novembre dernier est une radioactivité de 25 400 Bq/kg, le second record de radioactivité est de 20 500 Bq/kg. Ces deux échantillons proviennent du conté de Futaba, la dose ambiante y était entre 3,8 et 24,9 μSv/h.

L’Agence Forestière déclare que ça ne représente que 10 % des relevés de 2011. De fait, leurs données montrent qu la radioactivité était entre 125 000 et 253 000 Bq/kg en 2011, ce qui est extrêmement élevé.
Néanmoins, ils disent que la dose d’exposition horaire aux pollens radioactifs n’a du être que de 0,0000215 à 0,000192 μSv/h, ce qui n’est pas réellement dangereux.


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.


March 2015