Black substance found in Chiba

Following up this article ..Video of black substance

Similar substance found in Toukatsu Chiba.

Black substance found in Chiba


The radiation level is 0.36 microSv/h at 10cm from the substance.

The person who found this tweeted like this below.


‏ @momousagi2011



Now I don’t know if it’s exactly the same thing as in Minami soma, but I haven’t seen such black “dust” though I’ve been living here for 10 years. Normal dust flies by the wind but this black substance is wet and greasy. It reminds me of black rain after Hiroshima and Nagasaki.


Prof.Hayakawa from Gunma university talks, it’s everywhere in Toukatsu, and even in Tokyo.

  1. 0.36 microsieverts per hour translates to about 3.2 millisieverts per year. Depending on the baseline this may be normal or somewhat elevated. However, it is, globally speaking, a rather normal reading even in the absence of a nuclear disaster.

    The radiation level near the subtance is low enough to eliminate any need for immediate alarm. It needs to be confimed how much the substance contributes to the radiation dose rate. If can be confirmed that bringing the Geiger counter near the substance does increase the reading, it would obviously be a good idea to try and collect the substance and wash off the surfaces it is attached to. It would also be a good idea to analyze the substance. It could be something natural such as lichen, mold or volcanic dust or, for instance, something produced by an industrial process.

    What the substance is very likely *not* to be is particles of nuclear fuel or its decay products. It would be intensively radioactive if that were the case. A fraction of a microsievert per hour would not be the expected reading in this case. However, we can’t know anything for sure before the substance has been analyzed.

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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.


February 2012