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Station list Japan - absorbed dose rate

< Vmax < 10 * Vmax < 100 * Vmax > 100 * Vmax
Stations: 357 Date UTC Radiation
μGy/h
Vmin ~ Vmax
μGy/h
Okinawa 2011-08-29 09:00 0.024 0.0133~0.0575
Kagoshima 2011-09-01 09:00 0.036 0.0306~0.0943
Satsuma-sendai monitoring center Satsuma-sendai City 2013-05-31 06:00 0.043 0.039167~0.0875
Ueno Satsuma-sendai City 2013-05-31 06:00 0.035 0.032~0.076333
Yorita Satsuma-sendai City 2013-05-31 06:00 0.030 0.026~0.083833
Takae Satsuma-sendai City 2013-05-31 06:00 0.032 0.026~0.077333
Kodaira Satsuma-sendai City 2013-05-31 06:00 0.032 0.029~0.071667
Gumisaki Satsuma-sendai City 2013-05-31 06:00 0.027 0.007~0.067667
Minato Satsuma-sendai City 2013-05-31 06:00 0.034 0.0264~0.070833
Miyazaki 2011-08-18 09:00 0.026 0.0243~0.0664
Kumamoto 2011-04-10 17:00 0.027 0.021~0.067
Nagasaki 2011-08-18 09:00 0.028 0.027~0.069
Oita 2011-08-29 09:00 0.050 0.048~0.085
Saga 2011-08-29 09:00 0.040 0.037~0.086
Takasimamati 2014-10-25 21:10 0.022 0.01725~0.074333
Kashu Ikata Town 2013-05-31 06:00 0.024 0.022667~0.069833
Toyonoura Ikata Town 2013-05-31 06:00 0.012 0.0105~0.0595
Taisei Ikata Town 2013-05-31 06:00 0.022 0.02~0.045167
Kucho Ikata Town 2013-05-31 05:10 0.023 0.021333~0.061667
Kyoudomarisaki Karatsu City 2013-05-31 06:00 0.029 0.026~0.165
Kuchogoshi Ikata Town 2013-05-31 06:00 0.018 0.015~0.057667
Kawanagata Ikata Town 2013-05-31 06:00 0.024 0.02~0.060167
Minatoura Ikata Town 2013-05-31 06:00 0.016 0.014~0.051833
Hirao Genkai Town 2013-05-31 06:00 0.030 0.027833~0.162333
Ikatagoshi Ikata Town 2013-05-31 06:00 0.019 0.017333~0.056833
Fukuoka 2011-08-18 09:00 0.036 0.034~0.079
Hokawaduura Genkai Town 2013-05-31 06:00 0.034 0.031~0.11775
Imamura Genkai Town 2013-05-31 06:00 0.028 0.025333~1.39833
Kushi Genkai Town 2013-05-31 06:00 0.031 0.028~0.1625
Sakibe Karatsu City 2013-05-31 06:00 0.031 0.028~0.154
Kochi 2011-08-18 09:00 0.027 0.023~0.076
Ehime 2011-08-18 09:00 0.048 0.045~0.074
Tokushima 2011-08-18 09:00 0.040 0.037~0.067
Yamaguchi 2011-08-18 09:00 0.092 0.084~0.128
Wakayama 2011-09-05 09:00 0.031 0.031~0.056
Kagawa 2011-08-18 09:00 0.054 0.051~0.077
Izumisano municipal Oike athletic field Station 2013-05-31 06:00 0.055 0.048667~0.104667
Izumisano municipal Hineno primary scool Station 2013-05-31 06:00 0.042 0.041~0.080167
Osaka prefectural Sano supporting school Station 2013-05-31 06:00 0.038 0.0345~0.097
Kumatori town Minami primary school Station 2013-05-31 06:00 0.048 0.048167~0.1065
Izumisano municipal Hineno filtration plant Station 2013-05-31 06:00 0.040 0.042667~0.100167
Osaka prefectural Kumatori off-site-center Station 2013-05-31 06:00 0.042 0.044333~0.092333
Osaka prefectural Hineno high scool Station 2013-05-31 06:00 0.035 0.035167~0.089
Atom-kyoudou nursery school Station 2013-05-31 06:00 0.051 0.053833~0.1005
Kumatori town Nishi primary school Station 2013-05-31 06:00 0.051 0.052333~0.092833
Yamanotedai-No.1 Park Station 2013-05-31 06:00 0.051 0.05~0.099333
Hiroshima 2011-04-10 17:00 0.046 0.035~0.069
Kumatori Town office Station 2013-05-31 06:00 0.036 0.039333~0.076167
Radiation at Tamaki-cho Mie Japan 2011-07-25 09:33 0.040 0.114 (Japan mean)
Shirowa primary school Omaezaki City 2013-05-31 00:20 0.044 0.069~0.118333
Shinkango Omaezaki City 2013-05-31 06:00 0.036 0.074~0.1335
Hiraba Omaezaki City 2013-05-31 06:00 0.034 0.0395~0.119167
Uenohara Omaezaki City 2013-05-31 06:00 0.044 0.028~0.121667
Shirasuna Omaezaki City 2013-05-31 06:00 0.035 0.066~0.119167
Kusabue Omaezaki City 2013-05-31 06:00 0.037 0.074167~0.125833
Sakuragaike community hall Omaezaki City 2013-05-31 06:00 0.045 0.07~0.120833
Sakurasan Ward Omaezaki City 2013-05-31 06:00 0.038 0.063~0.115333
Jitougata primary school Makinohara City 2013-05-31 06:00 0.041 0.066167~0.114333
Nakamachi Omaezaki City 2013-05-31 06:00 0.053 0.078~0.117833
Omaezaki City monitoring center 2013-05-31 06:00 0.038 0.074~0.1235
The athletic field Station of Kinki University 2013-05-31 06:00 0.038 0.0395~0.073833
South point of Kinki University Atomic Energy Research Instirute Station 2013-05-31 06:00 0.054 0.054333~0.0915
North point of Kinki University Atomic Energy Research Instirute Station 2013-05-31 06:00 0.049 0.055167~0.077667
Higashiosaka municipal Kamikosaka primary scool Station 2013-05-31 06:00 0.043 0.046167~0.0775
Okayama 2011-08-18 09:00 0.049 0.043~0.104
Daitou branch Kakegawa City 2013-05-31 06:00 0.039 0.0495~0.120667
Hamaokakita primary school Omaezaki City 2013-05-31 06:00 0.041 0.069833~0.1225
Nara 2011-08-18 09:00 0.050 0.046~0.08
Osaka 2011-04-10 17:00 0.042 0.042~0.061
Hyogo 2011-04-10 17:00 0.037 0.035~0.076
Ogasa branch Kikugawa City 2013-05-31 06:00 0.043 0.075167~0.123333
Ibaraki-city Environment 2011-10-15 00:49 0.044 0.114 (Japan mean)
Mie 2011-08-18 09:00 0.046 0.0416~0.0789
Shizuoka 2011-08-18 09:00 0.040 0.0281~0.0765
Shiga 2011-08-18 09:00 0.033 0.031~0.061
Kyoto 2011-08-18 09:00 0.038 0.033~0.087
Aichi 2011-08-18 09:00 0.042 0.035~0.074
Nagasawa Yokosuka City 2013-05-31 06:00 0.038 0.031~0.065333
Hairando Yokosuka City 2013-05-31 06:00 0.039 0.022333~0.07
Kurihama Yokosuka City 2013-05-31 06:00 0.035 0.0245~0.066833
Sahara Yokosuka City 2013-05-31 06:00 0.038 0.024167~0.061833
Funagura Yokosuka City 2013-05-31 06:00 0.039 0.029~0.066
Uraga Yokosuka City 2013-05-31 06:00 0.041 0.024167~0.055833
Hinode Town Yokosuka City 2013-05-31 06:00 0.034 0.026667~0.044
Nishihemi Yokosuka City 2013-05-31 06:00 0.036 0.024833~0.053333
Ten-no Kagamino Town 2013-05-31 06:00 0.056 0.022333~0.119
Ningyotoge Kagamino Town 2013-05-31 06:00 0.062 0.018667~0.099333
Kijiyama Misasa Town 2014-10-25 21:10 0.048 0.0145~0.0925
Akawase Kagamino Town 2013-05-31 06:00 0.047 0.0175~0.076167
kanagawa 2011-04-10 17:00 0.058 0.035~0.069
Tottori 2011-08-18 09:00 0.041 0.033~0.079
Gifu 2011-08-29 09:00 0.062 0.057~0.11
Oitomi Ayabe City 2014-10-25 21:10 0.044 0.024~0.1175
Kurahashi Maizuru City 2014-10-25 21:10 0.050 0.036~0.093333
Kou Itimatsu Suetsugu 2013-05-31 06:00 0.032 0.022833~0.085
Shimane 2011-08-18 09:00 0.065 0.036~0.11
Nishi-hamasada Matsue City 2013-05-31 06:00 0.047 0.027667~0.111167
Nagai Ohi Town 2013-05-31 06:00 0.035 0.024167~0.098667
Kichisaka Maizuru City 2014-10-25 21:10 0.038 0.022667~0.1355
Obama Obama City 2013-05-31 06:00 0.038 0.0336~0.0835
Okayasu Maizuru City 2014-10-25 21:10 0.038 0.025333~0.1115
Ogurui Takahama Town 2013-05-31 06:00 0.040 0.028833~0.087333
Shiokumi Maizuru City 2014-10-25 21:10 0.037 0.021~0.168667
Sadahongou Matsue City 2013-05-31 06:00 0.030 0.021~0.0995
Yamanaka Takahama Town 2013-05-31 06:00 0.027 0.011~0.108833
Kounoura Takahama Town 2013-05-31 06:00 0.029 0.020333~0.084333
Chidori Kawasaki Ward 2013-05-31 06:00 0.036 0.02~0.063833
Kita-koubu Matsue City 2013-05-31 06:00 0.037 0.021833~0.103833
Koura Matsue City 2013-05-31 06:00 0.041 0.036167~0.105833
Shiohama Kawasaki Ward 2013-05-31 06:00 0.049 0.038333~0.074667
Oshima Kawasaki Ward 2013-05-31 06:00 0.045 0.032667~0.071167
Kami-koubu Matsue City 2013-05-31 06:00 0.037 0.0185~0.096833
Hitsuhama Ohi Town 2013-05-31 06:00 0.029 0.028167~0.091167
Ukishima Kawasaki Ward 2013-05-31 06:00 0.048 0.031667~0.2175
Miyadome Ohi Town 2013-05-31 04:00 0.035 0.024667~0.081667
Hukada-kita Matsue City 2013-05-31 06:00 0.028 0.019~0.081833
Anojiri Obama City 2013-05-31 06:00 0.029 0.02075~0.08
Mitsu Matsue City 2013-05-31 06:00 0.041 0.03~0.088667
Otomi Takahama Town 2013-05-31 06:00 0.044 0.035~0.098
Tayu Matsue City 2013-05-31 06:00 0.043 0.039333~0.092667
Tonomachi Kawasaki Ward 2013-05-31 06:00 0.032 0.026667~0.112333
Kataku Matsue City 2013-05-31 06:00 0.043 0.036833~0.088833
Oyama Maizuru City 2014-10-25 21:10 0.032 0.019~0.097667
Owashi Matsue City 2013-05-31 06:00 0.037 0.0325~0.094667
Environment Feeds from Ohta 2013-04-30 09:20 0.051 0.114 (Japan mean)
Chiba 2011-04-10 17:00 0.056 0.022~0.044
Geiger Counter Feeds from Asao Kawasaki 2013-04-29 03:50 0.034 0.114 (Japan mean)
Sakajiri Mihama Town 2013-05-31 06:00 0.059 0.030667~0.123667
Tsuruga Tsuruga City 2013-05-31 06:00 0.057 0.0272~0.0935
Yamanashi 2011-08-18 09:00 0.047 0.04~0.064
Tokyo 2011-04-10 17:00 0.083 0.028~0.079
Takenami Mihama Town 2013-05-31 06:00 0.070 0.0424~0.116333
Nyuu Mihama Town 2013-05-31 06:00 0.061 0.0344~0.106
Shiraki pass Tsuruga City 2013-05-31 06:00 0.078 0.0336~0.139833
Shiraki Tsuruga City 2013-05-31 06:00 0.078 0.0376~0.1335
Urasoko Tsuruga City 2013-05-31 06:00 0.073 0.0294~0.110833
Tateishi Tsuruga City 2013-05-31 06:00 0.069 0.0414~0.092167
Kouno Minami-Echizen Town 2013-05-31 06:00 0.046 0.0344~0.084
Saitama 2011-04-10 17:00 0.064 0.031~0.06
Fukui 2011-08-18 09:00 0.045 0.032~0.097
Radiation dose in KEK, Tsukuba 2013-04-27 15:20 0.040 0.114 (Japan mean)
Tokushuku Hokota City 2013-05-31 06:00 0.065 0.032667~0.055667
Momiyama Hokota City 2013-05-31 06:00 0.073 0.037167~0.088167
Kamitoda Hokota City 2013-05-31 06:00 0.065 0.035833~0.061667
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 2011-07-14 13:37 0.157 0.114 (Japan mean)
Araji Hokota City 2013-05-31 06:00 0.075 0.0425~0.074333
Tsukuriya Hokota City 2013-05-31 06:00 0.089 0.039833~0.074167
Tasaki Hokota City 2013-05-31 06:00 0.068 0.032167~0.066167
Ebisawa Ibaraki Town 2013-05-31 06:00 0.067 0.0418~0.1922
Radiation dose at JAEA Oarai (P15) 2011-07-14 13:36 0.243 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P14) 2011-07-14 13:36 0.238 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P1) 2011-07-14 13:36 0.190 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P13) 2011-07-14 13:36 0.232 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P16) 2011-07-14 13:36 0.176 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P12) 2014-04-29 06:50 0.048 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P2) 2013-04-27 23:20 0.031 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P11) 2011-07-14 13:36 0.448 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P7) 2011-07-14 13:36 0.270 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P5) 2011-07-14 13:36 0.169 0.114 (Japan mean)
Radiation dose at JAEA Oarai (P6) 2011-07-14 13:36 0.123 0.114 (Japan mean)
Yatabe Ibaraki Town 2013-05-31 06:00 0.062 0.036~0.060167
Nemoto Hitachioomiya City 2013-05-31 06:00 0.080 0.037~0.082667
Onuki Oarai Town 2013-05-31 06:00 0.070 0.033~0.081167
Isohama Oarai Town 2013-05-31 06:00 0.059 0.0375~0.070833
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 2011-07-14 13:36 0.123 0.114 (Japan mean)
Oba Mito City 2013-05-31 06:00 0.065 0.039~0.2305
Yoshizawa Mito City 2013-05-31 06:00 0.051 0.039167~0.063667
Ibaraki 2011-04-10 17:00 0.147 0.036~0.056
Yanagisawa Hitachinaka City 2013-05-31 06:00 0.066 0.035333~0.062833
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 2011-07-14 13:36 0.127 0.114 (Japan mean)
Horiguchi Hitachinaka City 2013-05-31 06:00 0.079 0.036667~0.077
Ajigaura Hitachinaka City 2013-05-31 06:00 0.070 0.0425~0.073333
Gunma 2011-04-10 17:00 0.041 0.017~0.045
Ishikawa Mito City 2013-05-31 06:00 0.066 0.044~0.071667
Hitachinaka Hitachinaka City 2013-05-31 06:00 0.098 0.040167~0.077333
Mawatari Hitachinaka City 2013-05-31 06:00 0.073 0.044833~0.078167
Godai Naka City 2013-05-31 06:00 0.053 0.033333~0.060833
The Observation point for comparison Tatsunokuchi 2013-05-31 06:00 0.043 0.020833~0.081
Sawa Hitachinaka City 2013-05-31 06:00 0.063 0.032333~0.061333
Sugaya Naka City 2013-05-31 06:00 0.083 0.042167~0.107667
Muramatsu Tokai Village 2013-05-31 06:00 0.073 0.044333~0.075167
Oshinobe Tokai Village 2013-05-31 06:00 0.060 0.040833~0.070167
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 2011-07-14 13:36 0.124 0.114 (Japan mean)
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 2011-07-14 13:36 0.077 0.114 (Japan mean)
Yokobori Naka City 2013-05-31 06:00 0.057 0.035833~0.0705
Funaishikawa Tokai Village 2013-05-31 00:30 0.069 0.0425~0.073
Kounosu Naka City 2013-05-31 06:00 0.048 0.025667~0.055
Toyooka Tokai Village 2013-05-31 06:00 0.073 0.0465~0.0745
Motokomezaki Naka City 2013-05-31 06:00 0.057 0.029167~0.059
Ishigami Tokai Village 2013-05-31 06:00 0.073 0.042167~0.067667
Kadobe Naka City 2013-05-31 06:00 0.053 0.034833~0.149667
Nukada Naka City 2013-05-31 06:00 0.056 0.037833~0.066
Uridura Naka City 2013-05-31 06:00 0.055 0.037667~0.063
Kuji Hitachi City 2013-05-31 06:00 0.083 0.039~0.176
Isobe Hitachiota City 2013-05-31 06:00 0.059 0.042~0.346
Mayumi Hitachiota City 2013-05-31 06:00 0.053 0.035833~0.063167
Nemoto Hitachioomiya City 2013-05-31 06:00 0.048 0.032833~0.071167
Onuma Hitachi City 2013-05-31 06:00 0.076 0.0365~0.065667
Kume Hitachiota City 2013-05-31 06:00 0.050 0.035833~0.061833
Tochigi 2011-04-10 17:00 0.074 0.03~0.067
Ishikawa 2011-08-18 09:00 0.049 0.0291~0.1275
Nagano 2011-08-18 09:00 0.042 0.0299~0.0974
Toyama 2011-04-10 17:00 0.048 0.029~0.147
Shika Shika Town 2013-05-31 06:00 0.047 0.031167~0.119333
Akasumi Shika Town 2013-05-31 06:00 0.047 0.04~0.1025
Goritoge Shika Town 2013-05-31 06:00 0.054 0.035~0.125167
Fukushima [75] (distance from Fukushima I: 45 km) 2011-09-28 16:50 0.100 0.037~0.071
Otsu Nanao City 2013-05-31 06:00 0.041 0.030333~0.098333
Noumi Shika Town 2013-05-31 06:00 0.051 0.0285~0.123833
Fukura Shika Town 2013-05-31 06:00 0.040 0.0335~0.111833
Kumano Shika Town 2013-05-30 23:40 0.046 0.033667~0.116167
Tsuchikawa Nanao City 2013-05-31 06:00 0.039 0.025~0.108833
Fukushima [73] (distance from Fukushima I: 35 km) 2011-09-28 11:21 0.400 0.037~0.071
Fukushima [74] (distance from Fukushima I: 35 km) 2011-06-16 10:52 0.200 0.037~0.071
Kazanashi Shika Town 2013-05-31 06:00 0.048 0.041~0.112
Fukushima [72] (distance from Fukushima I: 30 km) 2011-09-28 11:33 0.300 0.037~0.071
Fukushima [71] (distance from Fukushima I: 25 km) 2011-09-28 11:50 0.400 0.037~0.071
Fukushima [77] (distance from Fukushima I: 25 km) 2011-05-22 13:01 1.300 0.037~0.071
Futatsunuma Hirono Town 2013-05-31 06:00 0.195 0.036333~0.1
Fukushima [44] (distance from Fukushima I: 30 km) 2011-09-28 13:09 0.200 0.037~0.071
Yamadaoka Naraha Town 2013-05-31 06:00 0.222 0.038167~0.088667
Fukushima [43] (distance from Fukushima I: 20 km) 2011-09-28 11:21 0.500 0.037~0.071
Fukushima [51] (distance from Fukushima I: 40 km) 2011-08-12 14:20 0.200 0.037~0.071
Radiation dose at Tamokami elementary school, Koriyama 2011-07-14 13:36 0.210 0.114 (Japan mean)
Shigeoka Naraha Town 2013-05-31 06:00 0.543 0.0375~0.115333
Matsudate Naraha Town 2013-05-31 06:00 0.741 0.035~0.104333
Fukushima II MP7 2011-12-27 15:00 0.500 0.114 (Japan mean)
Fukushima II MP6 2011-12-27 15:00 0.800 0.114 (Japan mean)
Fukushima II MP5 2011-12-27 15:00 1.300 0.114 (Japan mean)
Fukushima II MP4 2011-12-27 15:00 1.400 0.114 (Japan mean)
Fukushima II MP3 2011-12-27 15:00 1.600 0.114 (Japan mean)
Fukushima II MP2 2011-12-27 15:00 1.100 0.114 (Japan mean)
Fukushima II MP1 2011-12-27 15:00 1.600 0.114 (Japan mean)
Shimo-Kooriyama Tomioka Town 2013-05-31 06:00 1.212 0.035833~0.097667
Kami-kooriyama Tomioka Town 2013-05-31 06:00 1.181 0.029167~0.076667
Fukushima [76] (distance from Fukushima I: 25 km) 2011-09-28 11:12 0.300 0.037~0.071
Tomioka Tomioka Town 2013-05-31 06:00 2.535 0.034667~0.098333
Fukushima [45] (distance from Fukushima I: 20 km) 2011-09-28 13:35 0.500 0.037~0.071
Yonomori Tomioka Town 2013-05-31 06:00 3.066 0.036333~0.091333
Kashiwazaki-shigai Kashiwazaki City 2013-05-31 06:00 0.042 0.026333~0.0935
Radiation dose at Big palette Fukushima, Koriyama 2011-07-14 13:36 0.510 0.114 (Japan mean)
Doai Kashiwazaki City 2013-05-31 06:00 0.039 0.0195~0.0955
Radiation dose at Ose administration center, Koriyama 2011-07-14 13:36 0.560 0.114 (Japan mean)
Mukaihata Okuma Town 2013-05-31 06:00 4.843 0.0345~0.093833
Radiation dose at Koriyama joint government building, Koriyama 2011-07-14 13:36 1.090 0.114 (Japan mean)
Radiation dose at Koriyama city office, Koriyama 2011-07-14 13:36 0.930 0.114 (Japan mean)
Arahama Kashiwazaki City 2013-05-31 06:00 0.038 0.0225~0.1015
Ono Okuma Town 2013-05-31 06:00 3.408 0.037~0.088333
Shimo-Takamachi Kariwa Village 2013-05-31 06:00 0.040 0.019~0.108667
Fukushima I MP8 2011-12-27 15:00 68.000 0.114 (Japan mean)
Kariwa Kariwa Village 2013-05-31 06:00 0.038 0.025~0.099833
Fukushima I MP7 2011-12-27 15:00 89.000 0.114 (Japan mean)
Power Station- 2013-05-31 06:00 0.034 0.014~0.1085
Fukushima I MP6 2011-12-27 15:00 33.000 0.114 (Japan mean)
Fukushima I MP5 2011-12-27 15:00 14.000 0.114 (Japan mean)
Kariwa Kariwa Village 2013-05-31 06:00 0.037 0.019~0.105167
Fukushima I MP4 2011-12-27 15:00 11.000 0.114 (Japan mean)
Power Station-South 2013-05-31 06:00 0.036 0.012167~0.111167
Yamada Futaba Town 2013-05-31 06:00 16.230 0.038~0.095667
Fukushima I MP3 2011-12-27 15:00 12.000 0.114 (Japan mean)
Fukushima [12] (distance from Fukushima I: 40 km) 2011-05-15 13:23 0.300 0.037~0.071
Fukushima I MP2 2011-12-27 15:00 19.000 0.114 (Japan mean)
Fukushima [14] (distance from Fukushima I: 35 km) 2011-09-28 09:53 0.200 0.037~0.071
Fukushima I MP1 2011-12-27 15:00 4.000 0.114 (Japan mean)
Fukushima [52] (distance from Fukushima I: 40 km) 2011-08-12 15:05 0.200 0.037~0.071
Fukushima [13] (distance from Fukushima I: 40 km) 2011-09-28 09:39 0.200 0.037~0.071
Katsuyama Kariwa Village 2013-05-31 06:00 0.037 0.017333~0.1015
Kooriyama Futaba Town 2013-05-31 06:00 1.063 0.035~0.089333
Fukushima [15] (distance from Fukushima I: 35 km) 2011-09-28 10:04 0.500 0.037~0.071
Shinzan Futaba Town 2013-05-31 06:00 4.226 0.037167~0.080167
kami-Hatori Futaba Town 2013-05-31 06:00 1.606 0.034~0.086833
Miyagawa Kashiwazaki City 2013-05-31 00:50 0.039 0.025833~0.0985
Nishiyama Kashiwazaki City 2013-05-31 06:00 0.040 0.016833~0.132333
Fukushima [41] (distance from Fukushima I: 20 km) 2011-09-28 09:49 0.500 0.037~0.071
Fukushima [42] (distance from Fukushima I: 30 km) 2011-09-28 08:36 0.700 0.037~0.071
Radiation dose at Agricultural center, Koriyama 2011-07-14 13:36 1.080 0.114 (Japan mean)
Radiation dose at Iwane Fureai Plaza, Motomiya 2011-07-13 14:16 1.180 0.114 (Japan mean)
Fukushima [21] (distance from Fukushima I: 30 km) 2011-09-28 11:45 1.800 0.037~0.071
Namie Namie Town 2013-05-31 06:00 0.774 0.039167~0.084167
Kiyohashi Namie Town 2013-05-31 06:00 0.289 0.035333~0.073833
Radiation dose at Shirasawa branch office, Motomiya 2011-07-14 13:36 0.690 0.114 (Japan mean)
Fukushima [23] (distance from Fukushima I: 35 km) 2011-09-28 12:02 0.500 0.037~0.071
Radiation dose at Motomiya city office, Motomiya 2011-05-10 10:05 0.920 0.114 (Japan mean)
Fukushima [22] (distance from Fukushima I: 35 km) 2011-09-28 11:53 0.300 0.037~0.071
Fukushima [46] (distance from Fukushima I: 20 km) 2011-09-28 09:15 4.300 0.037~0.071
Fukushima [35] (distance from Fukushima I: 35 km) 2011-06-16 13:13 1.000 0.037~0.071
Fukushima [79] (distance from Fukushima I: 40 km) 2011-09-28 10:58 7.300 0.037~0.071
Fukushima [34] (distance from Fukushima I: 30 km) 2011-09-28 11:24 4.400 0.037~0.071
Fukushima [31] (distance from Fukushima I: 30 km) 2011-09-28 10:51 6.100 0.037~0.071
Fukushima [11] (distance from Fukushima I: 40 km) 2011-09-28 13:21 0.800 0.037~0.071
Fukushima [10] (distance from Fukushima I: 40 km) 2011-09-28 10:46 0.500 0.037~0.071
Fukushima [32] (distance from Fukushima I: 30 km) 2011-09-28 10:33 16.100 0.037~0.071
Fukushima [33] (distance from Fukushima I: 30 km) 2011-09-28 09:53 12.500 0.037~0.071
Fukushima [80] (distance from Fukushima I: 25 km) 2011-09-28 16:00 0.100 0.037~0.071
Fukushima [20] (distance from Fukushima I: 45 km) 2011-09-28 12:09 0.400 0.037~0.071
Fukushima [4] (distance from Fukushima I: 50 km) 2011-09-28 09:02 0.700 0.037~0.071
Fukushima [78] (distance from Fukushima I: 45 km) 2011-09-28 15:00 0.500 0.037~0.071
Radiation dose at Tsukidatemachi kamitedo, Date 2011-05-09 16:35 2.000 0.114 (Japan mean)
Fukushima [63] (distance from Fukushima I: 45 km) 2011-08-12 15:14 1.200 0.037~0.071
Fukushima [61] (distance from Fukushima I: 40 km) 2011-08-12 14:41 3.500 0.037~0.071
Fukushima [62] (distance from Fukushima I: 40 km) 2011-08-12 14:50 4.500 0.037~0.071
Fukushima [1] (distance from Fukushima I: 60 km) 2011-09-28 13:21 0.600 0.037~0.071
Fukushima [2] (distance from Fukushima I: 55 km) 2011-09-28 09:05 1.200 0.037~0.071
Fukushima [3] (distance from Fukushima I: 45 km) 2011-09-28 10:06 2.000 0.037~0.071
Fukushima [5] (distance from Fukushima I: 45 km) 2011-09-28 10:44 0.300 0.037~0.071
Fukushima [7] (distance from Fukushima I: 45 km) 2011-09-28 11:07 0.500 0.037~0.071
Fukushima [6] (distance from Fukushima I: 45 km) 2011-05-13 11:39 0.800 0.037~0.071
Radiation dose at Date city office, Date 2011-05-09 16:35 1.410 0.114 (Japan mean)
Niigata 2011-08-18 09:00 0.047 0.031~0.153
Radiation dose in Yamamoto 2011-07-14 13:36 0.260 0.114 (Japan mean)
Radiation dose in Marumori 2011-07-14 13:36 0.090 0.114 (Japan mean)
Radiation dose in Kakuda 2011-07-14 13:36 0.260 0.114 (Japan mean)
Radiation dose in Watari 2011-07-14 13:36 0.230 0.114 (Japan mean)
Radiation dose in Iwanuma 2011-07-14 13:36 0.190 0.114 (Japan mean)
Radiation dose in Natori 2011-07-14 13:36 0.130 0.114 (Japan mean)
Yamagata 2011-08-18 09:00 0.044 0.025~0.082
Radiation dose at Tohoku University 2013-04-28 07:00 0.037 0.114 (Japan mean)
Sendai (Miyagi) 2011-09-07 09:00 0.060 0.0176~0.0513
Yoriiso Ishinomaki City 2013-05-31 06:00 0.086 0.012~0.027167
Radiation dose in Onagawa (MP-2) 2011-07-14 13:36 0.160 0.114 (Japan mean)
Radiation dose in Onagawa (MP-3) 2011-07-14 13:36 0.091 0.114 (Japan mean)
Radiation dose in Onagawa (MP-1) 2011-07-14 13:36 0.100 0.114 (Japan mean)
Radiation dose in Enoshima, Ojika 2011-07-14 13:36 0.064 0.114 (Japan mean)
Radiation dose in Onagawa (MP-6) 2011-07-14 13:36 0.110 0.114 (Japan mean)
Radiation dose in Tukahama, Ojika 2011-07-14 13:36 0.074 0.114 (Japan mean)
Koyadori Onagawa Town 2013-05-31 06:00 0.094 0.017167~0.034
Radiation dose in Koyadori, Ojika 2011-07-14 13:36 0.075 0.114 (Japan mean)
Radiation dose in Terama, Ojika 2011-07-14 13:36 0.068 0.114 (Japan mean)
Onagawa Onagawa Town 2013-05-31 06:00 0.071 0.01~0.024
Iwate 2011-08-18 09:00 0.045 0.014~0.084
Akita 2011-08-18 09:00 0.060 0.022~0.086
Misawa City hall Misawa City 2013-05-31 06:00 0.021 0.017~0.1335
Touhoku Town office Touhoku Town 2013-05-31 06:00 0.017 0.012~0.249
Touhoku Branch office Touhoku Town 2013-05-31 06:00 0.017 0.011~0.053833
Aomori 2011-08-18 09:00 0.029 0.017~0.102
Aomori Aomori City 2013-05-31 06:00 0.027 0.014~0.068833
Noheji Town Office Noheji Town 2013-05-31 06:00 0.032 0.011167~0.059
Hiranuma Rokkasho Village 2013-05-31 00:10 0.024 0.018~0.061833
Chitose-daira Rokkasho Village 2013-05-31 06:00 0.023 0.014~0.066667
Obuchi Rokkasho Village 2013-05-31 06:00 0.023 0.012~0.074333
Fukkoshi Yokohama Town 2013-05-31 06:00 0.023 0.014~0.064667
Yokohama Town Office Yokohama Town 2013-05-31 06:00 0.023 0.01725~0.094167
Tomari Rokkasho Village 2013-05-31 06:00 0.021 0.013833~0.104
Oippe Higashidoori Village 2013-05-31 06:00 0.017 0.012333~0.064167
Chikagawa Mutu City 2013-05-31 06:00 0.023 0.013833~0.076833
Odanosawa Higashidoori Village 2013-05-31 06:00 0.016 0.0145~0.0745
Sunagomata Higashidoori Village 2013-05-31 06:00 0.022 0.011~0.0935
Iwanai Iwanai Town 2013-05-31 06:00 0.036 0.016833~0.1155
Minami-Horoni Kyowa Town 2013-05-31 06:00 0.036 0.016333~0.099833
Hattari Kyowa Town 2013-05-31 06:00 0.037 0.017~0.112333
The Meteorological Obsevatory of kyowa Town 2013-05-31 06:00 0.035 0.01~0.1065
Horikappu Jinja Tomari Village 2013-05-31 06:00 0.031 0.013~0.103333
Herokaruusu Tomari Village 2013-05-31 06:00 0.034 0.009~0.107167
Chatsu Tomari Village 2013-05-31 06:00 0.036 0.0155~0.107333
Kayanuma Tomari Village 2013-05-31 06:00 0.033 0.014167~0.0955
Hokkaido 2011-08-18 09:00 0.030 0.02~0.105
Kamoenai Kamoenai Village 2013-05-31 06:00 0.032 0.013~0.0905
Units: absorbed dose rate [μGy/h]
  • In cases of x-rays and gamma rays and electrons absorbed by human tissue Gray is often converted into Sievert by assuming 1 Gy/h = 1 SV/h (see information below).
    Roentgen equivalent in man (rem): 1 Sv = 100 rem
  • Please note: The y-axis displaying the absorbed dose rate and accumulation plots can vary depending on location and time frame.


Data source - Absorbed dose rate:
Dataset 1 Dataset 2 Dataset 3 Dataset 4
Source MEXT Readings MEXT (SPEEDI) TEPCO Pachube
Data available since 13.3.2011 or 15.3.2011
hourly averages
since 1.1.2010
10 minute data
since 14.4.2011
10 minute data
since 22.3.2011
different sources with 10 minute data or hourly averages
 
hourly averages hourly averages hourly averages hourly averages
 
band Vmax-Vmin
Minimum value (Vmin) and maximum value (Vmax) from usual value band: "Usual value band means a range of the maximum and minimum value observed before the earthquake" [MEXT: e.g. pdf]) Minimum value (Vmin) and maximum value (Vmax) calculated with the data of the respective locations from 1.1.2010 to 10.3.2011 (from hourly averages) no value band no value band
Sometimes data is not transmitted due to maintenance or for other reasons. Missing data is not bridged by lines. Only values refering to sequential hours are connected.


Accumulated absorbed dose rate:
Dataset 1, Dataset 2, Dataset 3 and Dataset 4
 
Accumulated dose rate = summation of hourly averages of absorbed dose rate
Accumulation period: 13.3.2011 up to today
Accumulation of original data

Missing values:
Accumulation of interpolated data:
Missing values are approximated since original data of average absorbed dose rate is not available for every hour. Missing data points are computed by linear interpolation.
Missing data at the beginning of the period:
Missing values at the beginning of the accumulation period (13.3.) will be set to 0.
In those cases the calculated accumulation values show below the actual accumulation values. Regarding the assessment of the timeline: Radiation releases during the initial hydrogen explosions.
All data taken into account in the accumulation is shown in the graph ‘interpolated raw data’ (top left button above the graph).
 
The red graph shows the accumulation of 0,114 μGy/h based on an estimated average for Japan of 1000 μGy per year (equates 0,114 μGy/h *24 hours * 365 days). The accumulation starts with the first available value of the data set after 13.3.2011 (see missing values above).
 
The green graph shows the accumulation of Vmax. The accumulation starts with the first available value of the data set after 13.3.2011 (see missing values above).



Colour scale:
< Vmax < 10 * Vmax < 100 * Vmax > 100 * Vmax
The colour scale is based on the maximum Value (Vmax) measured at the location of the Geiger counter prior to the accident. Therefore allowing to spell out the changes in comparison to the values prior to the accident.
Natural radiation:
Health effects - information:
Units: absorbed dose rate [Gy/h]

Absorbed dose [Gy]:

The unit gray, [Gy], measures radiation which is absorbed into any material.


Equivalent dose [Sv]:

The unit sievert, [Sv], specifically measures radiation which is absorbed by a person.
The equivalent dose to a person is found by multiplying the absorbed dose, in gray, by a radiation weighting factor (WR ).
The radiation weighting factor WR is introduced to allow for the different relative biological effects of different types of ionizing radiation on human tissue.

In terms of SI base units:

1 Sv = 1 Gy ⋅ WR

where Sv=sievert, Gy=gray, WR =weighting factor specific to each type of radiation and tissue.

Radiation weighting factor (WR ):

For x-rays and gamma rays and electrons absorbed by human tissue, WR is 1. For alpha particles it is 20. To compute Sieverts from Grays, simply multiply by WR . This is obviously a simplification. The radiation weighting factor WR approximates what otherwise would be very complicated computations. The values for WR change periodically as new research refines the approximations [1].


Effective dose [Sv]:

The probability of a harmful effect from radiation exposure depends on what part or parts of the body are exposed. Some organs are more sensitive to radiation than others. A tissue weighting factor is used to take this into account. When an equivalent dose to an organ is multiplied by the tissue weighting factor for that organ the result is the effective dose to that organ. If more than one organ is exposed then the effective dose, is the sum of the effective doses to all exposed organs [1].

Tissue weighting factor:

see table European nuclear society


more information:

Fukushima I Nuclear power plant

ATTENTION: These products are highly uncertain based on limited information for the source terms. Please use with caution and understand that the values are likely to change.
Cloud spread Fukushima
Cloud spread Fukushima
Cloud spread Fukushima
Summary

Japan nuclear accident