Technical Assessment of Environmental Contamination From the - - PowerPoint PPT Presentation

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Technical Assessment of Environmental Contamination From the - - PowerPoint PPT Presentation

Dec 21, 2023 390 likes •552 views

Technical Assessment of Environmental Contamination From the Fukushima Dai-ichi Reactors September 11, 2012 Stephen V. Musolino, Ph.D. Certified Health Physicist Health Physics Society Representative 1 80 km 2 Government of Japan

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Technical Assessment of Environmental Contamination From the Fukushima Dai-ichi Reactors

September 11, 2012 Stephen V. Musolino, Ph.D. Certified Health Physicist Health Physics Society Representative

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80 km

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Government of Japan Replicated Joint Aerial Measuring Results with Soil Samples

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Deposition Map From Soil Samples

Preparation of Distribution Map of Radiation Doses, etc., (Map of Radioactive Cesium Concentration in Soil) by MEXT, August 30, 2011

2,200 Locations 5 points per locations

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Chernobyl Cs-137 Deposition

90 km

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Chernobyl Cs-137 Deposition

398k 63095 10000 1585 251 40 6.3 1 .16

Color scale not the same as Joint US-Japan and GOJ products

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Effects of Terrain

Results of Airborne Monitoring Survey by MEXT in Aichi, Aomori, Ishikawa, and Fukui Prefectures, November 25, 2011

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Extent of Contamination

Ariel survey as of November 11, 2011

Results of Airborne Monitoring Survey by MEXT in Aichi, Aomori, Ishikawa, and Fukui Prefectures, November 25, 2011 450 250 150 Dose Rate Total Cesium 350 350 450 250 150

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Isotopic Mix Consistent for

134,137Cs

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Air Filters (DOE)

  • N. Wimer Lawrence Livermore National Laboratory
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Soil Samples (DOE)

  • N. Wimer Lawrence Livermore National Laboratory
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Refractory Material Not Detected

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Refractory Material Not Detected

  • Trace amounts of 89, 90Sr detected in DOE soil samples
  • 103Ru not detected in DOE in situ gamma spectroscopy
  • Plutonium 238Pu, 239, 240Pu not detected in soil samples by MEXT‡

– Uranium detected in the samples naturally occurring 235U/ 238U ratio

‡ “Readings of Pu&U at Monitoring Post out of 20&30 Km Zone of Fukushima Dai-ichi NPP”, MEXT, April 1, 2011

Boiling Point °C Cs – 671 Sr – 1384 Zircaloy – 1850 Pu – 3235 Ru – 4150

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89,90Sr in Soil and Vegetation (GOJ)

Analysis by MEXT

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GOJ Evacuation as of August 2012

IAEA Fukushima Dai-ichi Status Report, 31 August 2012