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Fukushima Nuclear Reactors Radiological Assessment Summary

A comprehensive summary of radiological assessments in Fukushima post the nuclear disaster, including data on air measurements, AMS operations, and dose comparisons. Learn how radiation levels are monitored and interpreted.

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Fukushima Nuclear Reactors Radiological Assessment Summary

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  1. FUKISHIMA Nuclear ReactorsRadiological AssessmentAir Measurement SurveillanceAMSMarch 22, 2011

  2. Operations Summary • Aerial Measurement Systems totaled more than 40 hours of flights • Plot interpretation • AMS data presented as exposure rate 1 meter above ground at time of measurement AMS Summary

  3. Guide to Interpretation • US radiological assessments composed of aerial and ground measurements and indicate amounts of radiological material settled on ground. • Each measurement corresponds to radiation person receives in 1 hour at that location. • Calculations account for multiple variables. Radiation is most intense in first days after release. Dose reduction achieved by evacuating early • All measurements below 0.03 Rem per hour – a low level. Most elevated readings within 25 miles of Fukushima Daiichi. • Measurements show area of higher radiation extending northwest from Plants.

  4. Comparison • Nuclear Regulatory Commission (NCRP) estimates average US person receives 620 mRem a year* (or 0.071 mRem/hour) • Average transatlantic flight gives exposure of 2.5 mRem* • Typical chest x-ray produces 10 mRem per image • EPA guidelines for public health actions if exposure >1000 mRem over 4 days * Source: NRC: http://nrc.gov/images/about-nrc/radiation/factoid2-lrg.gif 6

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