12778.74Bq/kg of cesium from the HEPA filter of air cleaner in Yokohama

High level of cesium was measured from the HEPA filter (high-efficiency particulate air filters) of air cleaner.


Location : Five stories apartment in Yokohama Kanagawa
Usage : 2/4/2011 ~ 8/30/2012 (Not 24 hours everyday)
Size : 38.5×24×4 cm
Cs-134 : 5250.44 ± 68.456 Bq/Kg
Cs-137 : 7528.30 ± 68.476 Bq/Kg


↓ The HEPA filter

12778.74Bq/kg of cesium from the HEPA filter of air cleaner in Yokohama







12778.74 Bq/kg di cesio dal filtro dell’aria HEPA a Yokohama

Alti livelli di cesio sono stati misurati da filtri HEPA (Filtri dell’aria particolati ad alta efficienza) utilizzati per la pulizia dell’aria.

Luogo: 5 appartamenti a Yokohama, Kanagawa
Utilizzo: dal 04/02/2011 ~ 30/08/2012 (non 24h al giorno)
Dimensioni: 38.5 x 24 x 4 cm
Cs-134 : 5250.44 ± 68.456 Bq/Kg
Cs-137 : 7528.30 ± 68.476 Bq/Kg


Français :

12 778,74 Bq/kg de césium dans les filtres d’un épurateur d’air de Yokohama

Des niveaux élevés de césium a été relevée dans le filtre HEPA (High-Efficiency Particulate Air = à haut rendement sur les particules de l’air) d’un épurateur d’air.

Lieu : “Five stories apartment” de Yokohama, dans Kanagawa
Usage : 4 fev 2011 ~ 30 août 2012 (pas à 24 h/jour)
Taille : 38,5 × 24 × 4 cm
Cs-134 : 5 250,44 ± 68,456 Bq/kg
Cs-137 : 7 528,30 ± 68,476 Bq/kg

↓ Le filtre HEPA

12 778,74 Bq/kg de césium dans les filtres d'un épurateur d'air de Yokohama


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 2012