IAEAInternational Atomic Energy Agency

Technical Briefing on theRadiological Situation in Japan

19th March 2011

IAEA

Gamma-dose rate in microSv/h in various Prefectures

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IAEA

Gamma dose rates

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IAEA Information provided by MEXT

IAEA

Gamma dose rates near Tokai and Tokyo

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IAEA

Gamma-dose rate at Togichi, 140 km South West (microSv/h)

Background

14 March 15 March 16 March 17 March

Passage of the radioactive plumeResulting exposure pathways are• External exposure from the

cloud• Inhalation of contaminated air

during the passage of the plume

IAEA

IAEA Environmental Measurements in Japan 19 March 2011 at public locations

Location

Tokyo cityTokyo Regional Office, Iidabashi 07:20 0.06 0Tokyo Regional Office 07:20 0Tokyo Train Station 07:54 0.13 0Ginza 8-chome (Shinbashi Station) 08:02 0.03 0Tokyo Tower 08:10 0.05 0Shinagawa Train Station 08:19 0.04 0Shibuya Train Station 10:03 0.06 0

Kanagawa PrefectureKawasaki Train Station 08:42 0.15 0Yokohama Train Station 09:09 0.07 0

Chiba PrefectureMaihama, Tokyo Disney Resort 08:36 0.08 0Makuhari, Commercial Center 09:10 0.04 0Chiba City 09:30 0.03 0

alpha contamination

Surface dose rate, micro Sv/h

Time, JST (24h)

IAEA

Recent IAEA Environmental Measurements in Japan 19 March 2011 at selected locations

Location: Hasuda (Saitama Prefecture), 25 km from Tokyo• Dose rate: 0.04 microSv/h• Gross alpha count: 0 cps • Gross beta and gamma count: 127 cps

Location: Tamikochi (Saitama Prefecture), 110 km from Tokyo• Dose rate: 0.18 microSv/h• Gross alpha count: 0.2 cps• Gross beta and gamma count: 240 cps

Location: Nasugogem (Saitama Prefecture), 170 km from Tokyo• Dose rate: 2.9 microSv/h• Gross alpha count: 0 cps• Gross beta and gamma count: 2300 cps

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Locations