Update IAEA Assessment Fukushima Nuclear Accident Radiological Monitoring and Consequences - 30 March 2011

Fukushima Nuclear Accident
Radiological monitoring and consequences
30 March 2011

Gamma Dose Rates in µSv/hour14-29 March
Natural Background: 0.1 µSv/hour

Gamma dose rate / 21 March[Japan-MEXT measurement/IAEA intepretation]
Normal natural background of gamma dose-rate: 0.1µSv/h
Maximum levels @
30 km zone : 90 µSv/h)

I-131 and Cs-137 deposition to soil
Measurements done by Japan authorities
Soil sampling from March 18-26:
25-58 km from Fukushima NPP
depth: 5 cm
9 locations
Results:
High deposition and large variability
I-131: 0.2 to 25 MBq/m2
Cs-137: 0.02 to 3.7 MBq/m2

I-131 and Cs-137 deposition to soil
Highest value in a relative small area N-West to Fukushima NPP
The first assessment indicates that one of the IAEA operational criteria for evacuation is exceeded in Iitate village

Pu-238 and Pu-239/240 in soil(Japanese authorities)
Measured at Fukushima NPP: within the range of Japanese background
Seeking further information about origin

Monitoring of drinking water
Most recent data are below the levels established by Japanese authorities
Recommendations for restrictions on drinking water being lifted in most locations.
As of 28 March, recommendations for restrictions based on I-131 concentration remain in place in 4 locations of Fukushima prefecture.

Vegetables, fruits and milk24-29 March
98 food samples taken from 11 prefectures (Chiba, Fukushima, Gunma, Ibaraki, Kanagawa, Miyagi, Nagano, Niigata, Saitama, Tochigi and Yamagata)
I-131, Cs-134 and Cs-137:
Level not detected or below Japanese regulation values

I-131 Test in children’s Thyroid 24-28 March
Japanese authorities
203 measurements
Kawamata and Iwaki
Quantitative detailed data not provided
“Did not reveal any levels of exposure that would be a health concern”

IAEA Experts Dispatched to Japan
Radiation Monitoring Team
Team 1 (4) : 17 March-01 April, Tokyo
Team 2 (4) : 21 March -04 April, Fukushima
Team 3 (4) : 30 March – to replace Team 1
Food and Safety Team (3) : 25 March- 04 April
Food safety ( IAEA), Analytical approach and data analysis (IAEA) , food safety in emergency situation (FAO)
Marine Monitoring Assessment Observer: 02 April

IAEA Radiation monitoring teams
March 29, 1st team
8 locations in Tokyo region
Gamma-dose rates: 0.02 to 0.19 µSv/h
Natural background: 0.1 µSv/h
March, 29, 2nd team
Radius of 32 to 62 km from the Fukushima NPP
Dose rates: 0.5 to 6.8 µSv/h
Beta-gamma contamination: 0.05 to 0.45 MBq/m2

Joint FAO/IAEA Food Safety Assessment Team
Met with local government authorities in Fukushima, Ibaraki and Tochigi prefectures
Discussed various issues related to the contamination of food and the agricultural environment
Local government authorities briefed the team on:
Principal agricultural products affected
Main production areas and production methods (greenhouses, open-air)
Levels of contamination found (air, tap/ground water, vegetables)
Monitoring of soil contamination
Focus of mission:
Remediation strategies and techniques related to plant and animal production, food traceability and water/soil characterization

IAEA/Joint Radiation Emergency Management Plan
Regular activities via tele/videoconference
As of March 30: WHO liaison officer working at IEC

Singapore Radiation Monitoring Information
Cabbages imported from Japan:
I-131: 936 Bq/Kg (C.A 100 Bq/Kg)
Up to 9 times the recommended values of the Codex Alimentarius.

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Update IAEA Assessment Fukushima Nuclear Accident Radiological Monitoring and Consequences - 30 March 2011

by IAEA on Mar 31, 2011

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Update IAEA Assessment Fukushima Nuclear Accident Radiological Monitoring and Consequences - 30 March 2011 — Presentation Transcript