Fukushima Daiichi: Radiation measured within plant perimeter dropping

20 March 2011 Geoff Zeiss

Sunday, March 20, 2011 11:49 JST (22:49:00 Saturday March 19 ET) NHK reports that Tokyo Electric Power Company says that the radiation level at the plant’s headquarters building, located some 500 meters northeast of the No. 3 reactor, dropped to

2,625 μSv/hr at 8:30 on Sunday morning (19:30:00 Saturday March 19 ET).

For a nuclear energy worker 19 hours of exposure to this level of radiation is equivalent to the annual permissable exposure of 50 mSv (in Canada).

TEPSO says that the reading shows a drop of more than 800 μSv/hr from 18 hours ago–about the time the water-spraying at the No.3 reactor began.

~3,400 μSv/hr at 2:30 pm Saturday (01:30:00 a.m. Saturday March 19 ET)

Previously reported measurements by TEPCO about 500 meters northwest of the Fukushima Daiichi plant on Friday Mar 18 JST afternoon,

  • 1:50 PM 3,484 μSv/hr (12:50:00 a.m. Friday March 18 ET)
  • 2:50 PM 3,339 μSv/hr (1:50:00 a.m. Friday March 18 ET)

For a nuclear energy worker 15 hours of exposure to this level of radiation is equivalent to the annual permissable exposure of 50 mSv.

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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