Fukushima Daiichi: Three damaged reactors brought below 100 degrees C

19 October 2011 Geoff Zeiss

TEPCO has reported that the radiation being emitted from Fukushima Daiichi has droped by a half from a month ago.  The latest measurements indicate that radiation emitted from the damaged reactors is 100 million becquerels per hour.  TEPCO says that this equates to about 0.2 millisievert per year of radiation measured at the fringes of the plant.

An important reason for the drop in radiation emissions is that the temperatures of the three damaged active reactors were brought below 100 degrees C late in September dramatically reducing the amount of radioactive steam released into the atmoshere.

According to the Wall Street Journal the emissions from the plant have continued to decline from their peak March 15.

  • March 15 – 800 trillion Bq/hr
  • March 25-26 – 2.5 trillion Bq/hr
  • April 4-6 – 0.29 trillion Bq/hr
  • June 20-28 1 billion Bq/hr
  • July 26-Aug 12 – 200 million Bq/hr
  • Sep 1-17 – 200 million Bq/hr
  • Oct 3-13 – 100 million Bq/hr
Geoff Zeiss

Geoff Zeiss

Geoff Zeiss has more than 20 years experience in the geospatial software industry and 15 years experience developing enterprise geospatial solutions for the utilities, communications, and public works industries. His particular interests include the convergence of BIM, CAD, geospatial, and 3D. In recognition of his efforts to evangelize geospatial in vertical industries such as utilities and construction, Geoff received the Geospatial Ambassador Award at Geospatial World Forum 2014. Currently Geoff is Principal at Between the Poles, a thought leadership consulting firm. From 2001 to 2012 Geoff was Director of Utility Industry Program at Autodesk Inc, where he was responsible for thought leadership for the utility industry program. From 1999 to 2001 he was Director of Enterprise Software Development at Autodesk. He received one of ten annual global technology awards in 2004 from Oracle Corporation for technical innovation and leadership in the use of Oracle. Prior to Autodesk Geoff was Director of Product Development at VISION* Solutions. VISION* Solutions is credited with pioneering relational spatial data management, CAD/GIS integration, and long transactions (data versioning) in the utility, communications, and public works industries. Geoff is a frequent speaker at geospatial and utility events around the world including Geospatial World Forum, Where 2.0, MundoGeo Connect (Brazil), Middle East Spatial Geospatial Forum, India Geospatial Forum, Location Intelligence, Asia Geospatial Forum, and GITA events in US, Japan and Australia. Geoff received Speaker Excellence Awards at GITA 2007-2009.

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