Spectrum measurement of black substance

Related to this article..4.2 million Bq/Kg of cesium from Black substance and microscope pics

Gamma spectrum of black substance was recorded.


This is a sample from Fukushima a 3g of… of “Black powder” is highly cumulated radioactive dirt contains a bunch of Cs134,137 and maybe other fission products like Pu,Am,Ra etc in some amount. I received a report it says just 60g or 100g of this recorded over 600,000 Becquerels/kg in the testing. In Minamisoma city Fukushima prefecture about 25 km from Fukushima Daiichi power plant there are over 1million to 3million Bqs/kg of this stuff has been finding already. This sample isn’t from Minamisoma. but it’s high enough radiation coming from. gives about 10000cpm on my Ludlum. calibration:14000cpm/usvh.




This video shows you the gamma spectrum of 3g of the black substance.

It is compared to other 2 samples, taken in Tokyo (1800Bq/Kg) and calibration sources of Cs137 (3700Bq/kg). When it measures the sample from Tokyo, it takes time to show the cesium peak, but when it measures black substance, the three peaks of cesium 134 and 137 appear immediately. It’s almost the same or faster than when it measures the calibration sources.
Roughly estimating, this 3g of sample may contain 4500Bq of cesium.
This is everywhere in Fukushima and children are stuck in such a place.



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.


April 2012