Radiation level increased double within 20 days after decontamination

Decontamination in Fukushima


Decontamination of Fukushima


Fukushima decontamination


From 12/6/2011 to 12/20/2011, Japanese self defense force went to Fukushima to decontaminate.

900 members were sent to the town halls of Narahamachi, Tomiokamachi, Namiemachi, and Iidatemura.

As expected, they successfully proved decontamination is meaningless.




Self defense force struggled to decontaminate the flags of the Iidatemura town hall on 12/20/2011.

12/20 : 1.57 microSv/h

12/29 : 2.87 microSv/h

1/10 : 3.26 microSv/h

Between the stones of the path, dead leaves were already put.



Even Asahi newspaper reported like this below.

「屋根を高圧洗浄」除染効果低い 事故から時間経過で





Experts and house makers are warning about high-pressure washing to decontaminate the roofs because it may hurt the roof but doesn’t decrease the radiation level. Some of the local governments are starting to remove it from the decontamination options.
Fukushima local government tried to decontaminate the roof of a house in Oonami Fukushima, 8/2011.
However, the radiation level of 1cm above the roof (Concrete) only decreased by less than half.(2.4 microSv/h→1.6 microSv/h).
When it comes to slate, it was only 2.4 microSv/h → 2.0 microSv/h, and in the case of tiled roof, it was only 1.2 microSv/h → 1.1 microSv/h.





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.


January 2012