Black substance keeps coming back

Following up this article..240,000 Bq/Kg at 5km from Imperial Palace

Mr. Ishikawa, who found this black substance finds the same substance at many other locations in Tokyo.

She tweeted like these below,


Black substance keeps coming back


found black substance near the entrance of an elementary school of Tokyo.(3/21) It was removed a few days later than I found it, but it came back around the end of April. We need to repeat decontamination for years.





Black substance keeps coming back2


Cesium concentration of the black substance (Surface dose : 1.295μSv/h) found in Kotoku Tokyo. (Measured by germanium semiconductor detector)

134Cs 37,596Bq/kg

137Cs 53,344Bq/kg

Total 90,940Bq/kg

The picture was taken on 4/24.



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.


May 2012