3,000 Bq/kg of Uranium238 and 240 Bq/kg of Uranium235 from air conditioning filter in Tokyo

3,000 Bq/Kg of Uranium238 and 240 Bq/Kg of Uranium 235 were measured from the dust stuck to the air conditioning filter in Tokyo.

Uranium 235/238 is 8%, which is enriched uranium from Fukushima.

It was from an apartment on 20th floor, located at 300m from Tokyo tower.

Tokyo tower is 227.4km from Fukushima, 350m from Russian Embassy.


It was sent from Japan to Dr.C Busby in England.[Link]

The owner of the apartment evacuated right after 311 and came back 7 months after 311 to turn on the air conditioner. The filter took only air inside of the room.


・Uranium 238 (Dr. C Busby presumed it from Thorium 234, which is the daughter nuclide of Uranium 238) : 3,000 Bq/Kg

・Uranium 235 : 240 Bq/Kg

・Cesium 134 : 42,000 Bq/Kg

・Cesium 137 : 68,000 Bq/Kg

・Lead 210 : 7,500 Bq/Kg [cf. Breaking news : 8400 Bq/Kg of lead-210 was measured from sample of Yokohama]

↓ The sample of the dust on filter

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.


July 2012