US institution “Very low level of contaminant from Fukushima detected in West coast”/ Large areas left untested

On 11/10/2014, Woods Hole Oceanographic Institution announced they detected Cesium-134 from seawater of west coast of US.

Half-life of Cs-134 is only 2 years, therefore the detected Cs-134 originated in Fukushima for sure. They didn’t comment the specific reading of the contamination, but stated it was lower than 2Bq/m3 (> 0.2 Bq/m3), which is largely lower than the “harmful level”.


The sample was collected off the northern California coast this August.


The map below shows the sampling point and the rough readings of Cs-134, which was released by the institution.

Fukushima Diary found that they didn’t collect samples in the large area of the coast (red circled) though they took samples relatively throughout offshore.

Cs-134 was detected at 10 sampling locations but seawater is not tested at the nearest coastal area for some reason.

At this moment, Fukushima Diary hasn’t found the reason why they didn’t test the samples, where can be the most crucial for public health.


US institution Very low level of contaminant from Fukushima detected in West coast: Large areas left untested




Français :

Une institution US : “Une faible radioactivité de contaminants de Fukushima détectée sur la Côte Ouest” / De vastes régions non encore contrôlées


Le 10 novembre 2014, la Woods Hole Oceanographic Institution déclare qu’ils ont détecté du césium 134 dans l’eau de mer de le côte Ouest des États-Unis. La période du Cs 134 n’est que de 2 ans donc le Cs-134 détecté ne peut provenir que de Fukushima. Ils ne donnent pas le relevé exact de leurs mesures mais ils affirment qu’il est inférieur à 2 Bq/m³ (> 0,2 Bq/m³), ce qui est bien inférieur au “niveau dangereux”.

Les échantillons ont été pris au large au nord de la côte de Californie en août dernier.

La carte ci-dessous situe les points échantillonnés et les relevés moyens du Cs 134, telle que publiée par cette institution.
Le Fukushima Diary remarque qu’ils n’ont pas échantillonné à l’intérieur d’une grande région de la côte ouest (cercle rouge) bien qu’ils aient échantillonné au large de relativement toute la côte nord-américaine.
Le Cs 134 a été relevé en 10 points mais l’eau de la mer n’a pas été testée près des côtes les plus concernées.
Pour l’instant le Fukushima Diary n’a pas trouvé la raison pour laquelle ils n’ont pas testé dans la zone la plus cruciale pour la santé publique.

US institution Very low level of contaminant from Fukushima detected in West coast: Large areas left untested(ndt: blanc : négatif  au Cs 134
noir cerclé blanc : positif  très faible
flèches blanches : sens des courants)

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.


November 2014