Radiation Monitoring Data from Fukushima Area 04/22/2011


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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. 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 04/22/2011

  1. 1. Radiological Assessment - of effects from -Fukushima Daiichi Nuclear Power PlantApril 22, 2011<br />
  2. 2. Operations Summary<br /><ul><li>Aerial Measuring Systems have totaled more than 400 flight hours in support of aerial monitoring operations
  3. 3. NNSA’s Consequence Management Response Teams have collected approximately 160,000 total field measurements taken by DOE, DoD, and Japanese monitoring assets
  4. 4. 559 total air samples taken at U.S. facilities throughout Japan undergoing lab analysis in the United States</li></li></ul><li>Survey Data Over Time<br />
  5. 5. Assessment<br />An assessment of measurements gathered through April 20 continues to show:<br /><ul><li>Radiation levels continue to decrease
  6. 6. No measurable deposit of radiological material since March 19
  7. 7. US bases and facilities all measure dose rates below 32 microrem/hr (32 millionths of a REM) – a level with no known health risks
  8. 8. Agricultural monitoring and possible intervention will be required for several hundred square kilometers surrounding the site:
  9. 9. Soil and water samples are the only definitive method to determine agricultural countermeasures
  10. 10. Ground monitoring can give better fidelity to identify areas that require agricultural sampling</li></ul>4<br />
  11. 11. Context<br /><ul><li>The Nuclear Regulatory Commission estimates that the average American absorbs 620 mRem a year* (or 0.071 mRem/hour)
  12. 12. An average transatlantic flight produces an exposure of 2.5 mRem*
  13. 13. A typical chest x-ray produces 10 mRem per image
  14. 14. EPA guidelines call for public health actions if exposure exceeds 1000 mRem over 4 days</li></ul> * Source: NRC: http://nrc.gov/images/about-nrc/radiation/factoid2-lrg.gif<br />