7100 Bq/Kg of cesium from river-head area dam

Ministry of the Environment measured 7,100 Bq/Kg of Cs134 and 137 from the ground soil of Shimagawa dam, which is a river-head area to Tokyo.

They monitored 50 locations of river, and 19 locations of lake and river-head area in Gunma and published the result on 1/13/2012.(I-131, Cs-134, Cs-137)

The monitoring was done in early December.

7100 Bq/Kg of cesium from river-head area dam


From the result, high level of cesium was measured from the ground soil of the dams in river-head area.


1. Shimagawa Dam : 7,100 Bq/Kq

2. Yagisawa Dam : 2,900 Bq/Kg

3. Haruna lake : 2,500 Bq/Kg

They measured high level of cesium from river too.


1. Sakuragawa : 3,700 Bq/Kg

2. Ogurogawa : 3,100 Bq/Kg

3. Usuigawa : 2,000 Bq/Kg


Water comes from Gunma to Tokyo. Tapwater of Tokyo is likely to be contaminated at least by cesium. If Tokyo local government doesn’t warn the contamination of river, they conceal something.



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