Though Ministry of the Environment has been measuring cesium from upper than 5cm (1.97 inch) deep under riverbed since May 2011, researching group of Kinki university found more than half of the cesium is accumulated deeper than 5cm.
They measured 53,000 Bq/m2 of cesium at 15km from estuary of Edogawa river. In that area, 56% of cesium was measured from deeper than 5cm under riverbed (about 20cm/7.87inch) this April. In 4 other locations of downstream of the branch from Tonegawa river, 47 ~ 78 % of cesium were also measured from deeper than 5cm under riverbed.
Prof. Yamazaki from the researching team comments riverbed mud can travel by typhoons even if it’s 20cm deep. Government should immediately change their way of measurement.
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.