1.000 mSv/h

1.000 mSv/h near Unit No. 1. May 21, 2011

A maximum of 1,000 mSv/h was detected the May 21, 2011, outdoors in debris around reactor building No. 1.
The same day the radioactivity was 4,000 mSv/h indoors of the reactor building.

The Fukushima nuclear accident occurred the March 11, 2011 at 14.46 (JST) with the 9.0 magnitude Tōhoku earthquake.

On the site of the Fukushima 1 (Daiichi) Nuclear Power Plant the quake had an intensity of M 7 on Richter scale, causing the first damage to the facilities, and the initial leakage of radioactive substances.

At 15.42, the subsequent tsunami deprived the nuclear reactors of their cooling functions.
On March 12th, an explosion occurred in the outer structure of unit 1.
On March 14th, unit 3 reactor building explodes.
On March 15th, an explosion causes damage to unit 2 building, another explosion and fire occurred at the No. 4 unit spent fuel pool.
On April 12, Japan’s nuclear safety agency (JNES) and the International Atomic Energy Agency (IAEA) officially raises the Fukushima nuclear disaster to INES Level 7 (more at INES 7 article).

Timeline of the events:

  • Timeline of the Fukushima Daiichi nuclear disaster. Wikipedia page.

  • Timeline: Japan power plant crisis. Events since 11 to 14 March 2011. BBC News.

  • Daily update from Japan. Events timeline since March 18, to April 24, 2011.
    Tatsujiro Suzuki, The Bulletin of the Atomic Scientists.

  • Fukushima Daiichi Power Plant. Timeline of the news by Asahi Shimbun.
    The Asahi Japan Watch.


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    About Backyard World

    Backyard World is an art and information architecture project on the Fukushima crisis. The project was started March 17, 2011.
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