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Radiation Monitoring Data from Fukushima Area 05/13/2011


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In March, the U.S. Department of Energy released data recorded from its Aerial Measuring System as well as ground detectors deployed along with its Consequence Management Response Teams. Today, the Department provided the following update on the information gathered by the AMS. This is the second round of data that was collected and analyzed jointly with the Government of Japan's Ministry of Education, Culture, Sports, Science and Technology (MEXT). For a link to the joint monitoring data posted on May 6, visit the MEXT webpage:

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Radiation Monitoring Data from Fukushima Area 05/13/2011

  1. 1. Radiological Assessment - of effects from -Fukushima Daiichi Nuclear Power PlantMay 13, 2011<br />
  2. 2. Monitoring Results: Sendai to Tokyo <br />Results show radiation levels along Tohoku Shinkansen Bullet Train<br />The integrated dose was measured with a calibrated electronic dosimeter by a field team member riding the train as a passenger, and includes external exposure but not inhalation.<br />The dose rate was recorded every 3 seconds with a calibrated scintillator.<br />All measurements were made inside the train.<br />The dose rate in some stations is significantly lower than along the tracks outside the station; possible evidence of decontamination.<br />The dose rate measured in the train is expected to be different from that measured by AMS because the train is often elevated (further from deposited activity) or in tunnels (unaffected by released activity).<br />The contamination on track beds may weather differently than on other surrounding ground material.<br />2<br />
  3. 3. Monitoring Results: Sendai to Tokyo <br />Note: 1 milliRem (mRem) = 10 m(micro)Sieverts; 1 milliRem (mRem) = 1000 m(micro)rem<br />
  4. 4.
  5. 5. AMS Operations Summary<br /><ul><li>DOE/NNSA Aerial Measuring Systems have totaled more than 507 flight hours in support of aerial monitoring operations
  6. 6. NNSA’s Consequence Management Response Teams have collected over 269,500 total field measurements taken by DOE, DoD, and Japanese monitoring assets
  7. 7. More than 514 air samples taken at U.S. facilities throughout Japan undergoing lab analysis in the United States
  8. 8. 148 total in situ ground spectra taken throughout Japan for lab analysis in US
  9. 9. 115 Japan soil samples received, in-processed, and undergoing analysis </li></li></ul><li>Joint US-Japan AMS Data<br /><ul><li>These results are from a joint MEXT, DOE/NNSA and USFJ survey
  10. 10. Data based on 42 fixed wing and helicopter survey flights at altitudes ranging from 150 to 700 meters between April 6 and April 29
  11. 11. Exposure rates are averaged over areas 300 m to 1500 m in diameter
  12. 12. There is no data near the Town of Inawashiro because it is mountainous and not easily accessible by low-flying aircraft
  13. 13. The cesium deposition was determined from aerial and ground-based measurements
  14. 14. The ratio of the amount of Cs-137 to Cs-134 is uniform across the survey region
  15. 15. There is no aerial survey data directly over the nuclear power plant itself
  16. 16. The survey boundary was chosen based on many preliminary measurement that showed the extent of the deposition</li></li></ul><li>7<br />Joint US-Japan AMS Data<br />
  17. 17. 8<br />Joint US-Japan AMS Data<br />
  18. 18. Assessment<br />An assessment of measurements gathered through May 13 continues to show:<br /><ul><li>Radiation levels continue to decrease
  19. 19. No measurable deposit of radiological material since March 19
  20. 20. US bases and facilities all measure dose rates below 32 microrem/hr (32 millionths of a REM)** – a level with no known health risks
  21. 21. Agricultural monitoring and possible intervention will be required for several hundred square kilometers surrounding the site:
  22. 22. Soil and water samples are the only definitive method to determine agricultural countermeasures
  23. 23. Ground monitoring can give better fidelity to identify areas that require agricultural sampling</li></ul> ** Note: 1 milliRem (mRem) = 10 m(micro)Sieverts; 1 milliRem (mRem) = 1000 m(micro)rem<br />9<br />
  24. 24. Context<br /><ul><li>The Nuclear Regulatory Commission estimates that the average American absorbs 620 mRem a year* (or 0.071 mRem/hour)**
  25. 25. An average transatlantic flight produces an exposure of 2.5 mRem*
  26. 26. A typical chest x-ray produces 10 mRem per image
  27. 27. EPA guidelines call for public health actions if exposure exceeds 1000 mRem over 4 days</li></ul> * Source: NRC:<br /> ** Note: 1 milliRem (mRem) = 10 m(micro)Sieverts; 1 milliRem (mRem) = 1000 m(micro)rem<br />
  28. 28. ** Note: 1 milliRem (mRem) = 10 m(micro)Sieverts; 1 milliRem (mRem) = 1000 m(micro)rem<br />