Radiation Monitoring Data from Fukushima Area 05/06/2011

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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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  • The Tokyo Metro government reports on June 7, a sewage treatment facility in Ota-ku, Tokyo, with 2.7 microsieverts/hour detected in the air, and 10,540 becquerels/kilogram of cesium in the slag at the plant. And independent study in Koto-ku, Tokyo, showed 230,000 becquerels of cesium per square meter near another processing plant. These reports from the Tokyo and Yomiuri Shinbun(s). We need more testing, evaluation and explanation of these varying numbers and scales.
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  • 1. Radiological Assessment - of effects from -Fukushima Daiichi Nuclear Power PlantMay 6, 2011
  • 2. Operations Summary
    • DOE/NNSA Aerial Measuring Systems have totaled more than 490 flight hours in support of aerial monitoring operations
    • 3. NNSA’s Consequence Management Response Teams have collected over 218,000 total field measurements taken by DOE, DoD, and Japanese monitoring assets
    • 4. More than 500 air samples taken at U.S. facilities throughout Japan undergoing lab analysis in the United States
    • 5. 136 total in situ ground spectra taken throughout Japan for lab analysis in US
    • 6. 115 Japan soil samples received, in-processed, and undergoing analysis
  • 3
  • 7. Joint US-Japan AMS Data
    • These results are from a joint MEXT, DOE/NNSA and USFJ survey
    • 8. Data based on 42 fixed wing and helicopter survey flights at altitudes ranging from 150 to 700 meters between April 6 and April 29
    • 9. Exposure rates are averaged over areas 300 m to 1500 m in diameter
    • 10. There is no data near the Town of Inawashiro because it is mountainous and not easily accessible by low-flying aircraft
    • 11. The cesium deposition was determined from aerial and ground-based measurements
    • 12. The ratio of the amount of Cs-137 to Cs-134 is uniform across the survey region
    • 13. There is no aerial survey data directly over the nuclear power plant itself
    • 14. The survey boundary was chosen based on many preliminary measurement that showed the extent of the deposition
  • 5
  • 15. 6
  • 16. Assessment
    An assessment of measurements gathered through May 6 continues to show:
    • Radiation levels continue to decrease
    • 17. No measurable deposit of radiological material since March 19
    • 18. US bases and facilities all measure dose rates below 32 microrem/hr (32 millionths of a REM) – a level with no known health risks
    • 19. Agricultural monitoring and possible intervention will be required for several hundred square kilometers surrounding the site:
    • 20. Soil and water samples are the only definitive method to determine agricultural countermeasures
    • 21. Ground monitoring can give better fidelity to identify areas that require agricultural sampling
    7
  • 22. Context
    • The Nuclear Regulatory Commission estimates that the average American absorbs 620 mRem a year* (or 0.071 mRem/hour)
    • 23. An average transatlantic flight produces an exposure of 2.5 mRem*
    • 24. A typical chest x-ray produces 10 mRem per image
    • 25. EPA guidelines call for public health actions if exposure exceeds 1000 mRem over 4 days
    * Source: NRC: http://nrc.gov/images/about-nrc/radiation/factoid2-lrg.gif