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Radiation Monitoring Data from Fukushima Area 04/04/2011
 

Radiation Monitoring Data from Fukushima Area 04/04/2011

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On March 15, 33 experts from the Department’s National Nuclear Security Administration (NNSA) arrived in Japan along with more than 17,200 pounds of equipment. After initial deployments at U.S. ...

On March 15, 33 experts from the Department’s National Nuclear Security Administration (NNSA) arrived in Japan along with more than 17,200 pounds of equipment. After initial deployments at U.S. consulates and military installations in Japan, these teams have utilized their unique skills, expertise and equipment to help assess, survey, monitor and sample areas for radiation. The 33 team members joined another six DOE personnel already in Japan.

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    Radiation Monitoring Data from Fukushima Area 04/04/2011 Radiation Monitoring Data from Fukushima Area 04/04/2011 Presentation Transcript

    • Radiological AssessmentApril 4, 2011
    • AMS Summary
      • Ops Summary
      • Aerial Measuring Systems have totaled more than 221 flight hours in support of aerial monitoring operations
      • NNSA’s Consequence Management Response Teams have collected thousands of ground measurements provided by DOE, DoD and the Japanese monitoring teams
    • Guide to Interpretation
      • US radiological assessments are composed of aerial and ground measurements and indicate the amounts of radiological material that has settled on the ground.
      • Each measurement corresponds to the radiation a person receives in one hour at that location. AMS data is presented as exposure rate 1 meter from the ground at the time the measurements occurred.
      • All measurements in this plot are below 0.03 Rem per hour – a low but not insignificant level.
    • Assessment
      An assessment of measurements gathered through April 3 continues to show:
      Radiation levels consistently below actionable levels for evacuation or relocation outside of 25 miles
      Radiological material has not deposited in significant quantities since March 19
      An assessment of measurements gathered at US military installations in the Tokyo area through April 3 shows:
      Radiation levels far below actionable levels for evacuation or relocation
      All aerial measurements at US facilities were less than 32 microrem/hr - a level that poses no known health risk
      Monitoring of these locations will continue although no increases in deposited radiation are anticipated
    • Context
      • The Nuclear Regulatory Commission estimates that the average American absorbs 620 mRem a year* (or 0.071 mRem/hour)
      • An average transatlantic flight produces an exposure of 2.5 mRem*
      • A typical chest x-ray produces 10 mRem per image
      • EPA guidelines call for public health actions if exposure exceed 1000 mRem over 4 days
      * Source: NRC: http://nrc.gov/images/about-nrc/radiation/factoid2-lrg.gif