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IAEAInternational Atomic Energy Agency
Technical Briefing on theRadiological Situation in Japan
19th March 2011
IAEA
Gamma-dose rate in microSv/h in various Prefectures
2
IAEA
Gamma dose rates
3
IAEA Information provided by MEXT
IAEA
Gamma dose rates near Tokai and Tokyo
5
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
IAEA 9
Locations