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.

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飯舘村農民見習い伊藤延由
除染その後1:自衛隊の方が苦労して除染して下さった役場の石畳のその後、直後(12/20)の線量は1.57μSV/h、12月29日は2.87μSV/h、今日(1/10)は3.26μSV/h。だから無駄だと言ったのです。石畳の隙間には落ち葉が挟まっていました。(Source)

<Translation>

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.

<End>

 

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

東京電力福島第一原発の事故で汚染された家の屋根を高圧水で洗う「高圧洗浄」について、専門家や住宅メーカーが注意を呼びかけている。事故から時間がたち、いくら高圧で洗っても放射線量が落ちなくなっている。水圧を強めると屋根を傷つける恐れもある。高圧洗浄を除染メニューから外す市町村も出てきた。

東北・関東地方の8県の102市町村で進む除染の環境省ガイドラインでも、高圧洗浄は効果的な方法として挙げられている。

福島県は昨年8月、福島市大波地区で民家の屋根を高圧洗浄した。しかし、表面から1センチのところでの放射線量は半減にも及ばなかった=表。除染前に毎時2.4マイクロシーベルトだったコンクリート屋根は高圧洗浄後でも1.6マイクロシーベルトだった。さらに、2.4マイクロシーベルトだったスレート屋根は2マイクロシーベルトに、1.2マイクロシーベルトだった瓦屋根は1.1マイクロシーベルトにとどまった。

<Translation>

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.

<End>

(Source)

 

 

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.

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