Fukushima: Radioactive gas near Tokyo skyrocketed to 10,000,000,000 times normal levels


Based on video from a November 2014 presentation by Roland Draxler of NOAA Air Resources Laboratory (powerpoint document):

  • Video from Slide #4: ‘133Xe Example‘ – Xe-133 Air Concentration (kBq/m3) [kilobecquerels per cubic meter] from March 14-16, 2011 averaged between elevations of 0 meters and 100 meters with release starting at 9:00 am UTC on March 14, 2011
  • The red dot shown on the maps during each 1-hour time interval appears to signify the location with the maximum air concentration of radioactive Xenon-133 coming from Fukushima Daiichi. Maximum amounts are noted below the color key in the model video.
  • From 3:00 pm to 7:00 pm UTC on March 15, the red dot is located between 10 to 20 kilometers from the border of Tokyo Prefecture (outlined in red on maps to right). This location is 250 kilometers from Fukushima Daiichi.
  • The maximum air concentration during this 4-hour time period ranges from 800-1,800 kBq/m3 (800,000-1,800,000 Bq/m3).
  • Since 2008, the average Xe-133 air concentration** recorded at the CTBTO monitoring station nearby the location of the red dot has been 0.00016 Bq/m3.
  • > The Xe-133 concentrations near the border of Tokyo Prefecture on March 15 shown in the NOAA model are between 5 billion and 11.25 billion times average.

** Source: Study titled ‘Radioxenon detections in the CTBT international monitoring system…‘ published Feb 2014: “Five years of station history for 133Xe… measured at RN38 in Takasaki, Japan [50 km from location of red dots near Tokyo]… consist of 2,820… samples, collected from July 1, 2008 to May 18, 2013… The isotope 133Xe is detected in 60% of the samples, with an average activity concentration of 0.16 mBq/m3 [0.00016 Bq/m3].”

According to this study on the CTBT monitoring system, “the Fukushima event caused very high concentrations in all noble gas systems in the northern hemisphere.”

Watch a video of the NOAA model here

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