Significant amount of cesium fallout one month before 311

According to the measurement data of strontium90 and cesium134/137 by Ministry of Education, Culture, Sports, Science and Technology,(cf. MEXT admitted Strontium90 was measured in Tokyo and 9 other prefectures)

significant amount of Cesium 134 and 137  fallout was measured in Hitachinaka city Ibaraki, Shinjuku ku Tokyo and Chigasaki city Kanagawa on February 2011, one month before 311.

This is more than December 2011.

It’s “Impossible to measure” in Fukushima and Miyagi, which is not Not detectable.

2.2011 (cesium134/137, MBq/km2・month)

Miyagi : impossible to measure

Fukushima : impossible to measure

Ibaraki : 28

Tokyo : 3.2

Kanagawa : 5.5


Miyagi : impossible to measure

Fukushima : Equipment is not ready

Ibaraki : Measurement in progress

Tokyo : 6.9

Kanagawa : Measurement in progress

↓ Data of 2.2011

↓ Data of 12.2011


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