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Accumulated absorbed dose rate - T=13.03.2011 - 02.09.2014(see missing values above)

< Acc. Vmax < 2 * Acc. Vmax < 4 * Acc. Vmax > 4 * Ac.. Vmax
Stazioni: 353 Acc. abs. dose rate
μGy/T
Acc. Vmax
μGy/T
Acc. Vmean
μGy/T
Fukushima I MP7 696005.000 3387.17
Fukushima I MP8 570942.000 3387.17
Fukushima I MP6 240668.000 3387.17
Yamada Futaba Town 176983.000 2470.5 2943.94
Fukushima I MP2 140420.000 3387.17
Fukushima I MP5 111325.000 3387.17
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2153.86 3458.3
Fukushima I MP3 93730.602 3387.17
Fukushima I MP4 86821.500 3387.17
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2153.86 3458.3
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2102.74 3376.22
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2153.86 3458.3
Ono Okuma Town 38610.500 2281.11 2943.94
Shinzan Futaba Town 38332.801 2070.23 2943.94
Fukushima I MP1 31496.801 3387.17
Yonomori Tomioka Town 29815.900 2358.58 2943.94
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2153.86 3458.3
Tomioka Tomioka Town 25324.500 2539.35 2943.94
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2153.86 3458.3
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2153.86 3458.3
Shimo-Kooriyama Tomioka Town 13057.000 2522.15 2943.94
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2153.86 3458.3
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2153.86 3458.3
Kami-kooriyama Tomioka Town 11803.900 1979.85 2943.94
Fukushima II MP3 11060.600 3387.17
Fukushima II MP1 10903.000 3387.17
Kooriyama Futaba Town 10352.900 2306.94 2943.94
Fukushima II MP4 9696.330 3387.17
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2150.45 3452.83
Fukushima II MP5 9382.150 3387.17
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2153.86 3458.3
Matsudate Naraha Town 8410.890 2694.3 2943.94
Shigeoka Naraha Town 8115.970 2978.36 2943.94
Fukushima II MP2 7875.320 3387.17
Namie Namie Town 7321.210 2173.53 2943.94
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3403.58
Fukushima II MP6 7062.690 3387.17
Fukushima II MP7 6511.580 3384.43
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2153.86 3458.3
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2153.86 3458.3
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2153.86 3458.3
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2153.86 3458.3
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2153.86 3458.3
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2153.86 3458.3
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2148.74 3450.1
Futatsunuma Hirono Town 3520.340 2582.4 2943.94
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2153.86 3458.3
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2153.86 3458.3
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3400.85
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2153.86 3458.3
Kiyohashi Namie Town 3162.000 1906.66 2943.94
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2148.74 3450.1
Radiation dose at Agricultural center, Koriyama 3128.960 3400.85
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2153.86 3458.3
Radiation dose at Koriyama city office, Koriyama 2803.520 3400.85
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2153.86 3458.3
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2148.74 3450.1
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2153.86 3458.3
Yamadaoka Naraha Town 2205.340 2289.74 2943.94
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3403.58
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2153.86 3458.3
Kuji Hitachi City 1990.890 5356.03 3469.25
Hitachinaka Hitachinaka City 1951.950 2351.54 3466.51
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2148.74 3450.1
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2148.74 3450.1
Momiyama Hokota City 1837.540 2683.1 3469.25
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2148.74 3450.1
Horiguchi Hitachinaka City 1779.410 2345.11 3471.98
Onuma Hitachi City 1776.950 1996.8 3466.51
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2153.86 3458.3
Tsukuriya Hokota City 1736.890 2257.05 3469.25
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3400.85
Nemoto Hitachioomiya City 1633.190 2513.74 3466.51
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2153.86 3458.3
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2153.86 3458.3
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3409.06
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2153.86 3458.3
Radiation dose at JAEA Oarai (P12) 1512.140 3425.47
Radiation dose at Ose administration center, Koriyama 1494.270 3400.85
Araji Hokota City 1437.760 2262.1 3469.25
Ishigami Tokai Village 1431.690 2059.24 3469.25
Mawatari Hitachinaka City 1422.870 2378.78 3469.25
Radiation dose at JAEA Oarai (P11) 1399.370 3425.47
Onuki Oarai Town 1387.990 2470.07 3469.25
Sawa Hitachinaka City 1353.770 1865.01 3466.51
Toyooka Tokai Village 1321.760 2267.18 3469.25
Ajigaura Hitachinaka City 1313.890 2229.91 3466.51
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2153.86 3458.3
Geiger Counter Feeds from Asao Kawasaki 1266.620 3378.96
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3400.85
Isohama Oarai Town 1250.540 2152.19 3463.78
Ebisawa Ibaraki Town 1222.240 5844.42 3466.51
Muramatsu Tokai Village 1203.520 2287.48 3469.25
Kamitoda Hokota City 1184.740 1876.65 3469.25
Yanagisawa Hitachinaka City 1166.970 1910.63 3466.51
Tokushuku Hokota City 1159.730 1694.06 3469.25
Tasaki Hokota City 1153.300 1996.13 3439.15
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2153.86 3458.3
Kadobe Naka City 1086.580 4551.07 3466.51
Radiation dose at Date city office, Date 1076.050 3403.58
Oshinobe Tokai Village 1041.340 2135.32 3469.25
Oba Mito City 1037.670 7014.58 3469.25
Godai Naka City 1031.270 1851.27 3469.25
Ishikawa Mito City 1030.810 2182.69 3471.98
Isobe Hitachiota City 1013.130 10529.5 3469.25
Yatabe Ibaraki Town 996.127 1831 3469.25
Radiation dose at Motomiya city office, Motomiya 992.703 3403.58
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2148.74 3450.1
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2148.74 3450.1
Yokobori Naka City 930.280 2145.46 3469.25
Sugaya Naka City 926.186 3279.11 3471.98
Kounosu Naka City 926.087 1673.76 3469.25
Funaishikawa Tokai Village 900.399 2221.54 3469.25
Nukada Naka City 899.900 2005.34 3463.78
Uridura Naka City 890.113 1914.19 3463.78
Shiraki Tsuruga City 881.330 4065.88 3471.98
Motokomezaki Naka City 880.851 1778.5 3436.42
Shiraki pass Tsuruga City 850.284 4258.75 3471.98
Radiation dose in Yamamoto 846.633 3425.47
Yoshizawa Mito City 837.646 1937.51 3469.25
Radiation dose at JAEA Oarai (P7) 831.135 3425.47
Mayumi Hitachiota City 828.119 1922.3 3469.25
Urasoko Tsuruga City 826.465 3375.53 3471.98
Nemoto Hitachioomiya City 825.588 2164.05 3466.51
Takenami Mihama Town 804.283 3543.04 3471.98
Radiation dose at JAEA Oarai (P15) 780.207 3425.47
Tateishi Tsuruga City 780.092 2807.04 3471.98
Radiation dose at JAEA Oarai (P14) 770.174 3425.47
Radiation dose at JAEA Oarai (P13) 769.612 3425.47
Ukishima Kawasaki Ward 735.475 6624.18 3471.98
Kume Hitachiota City 713.958 1881.7 3469.25
Radiation dose at JAEA Oarai (P2) 712.011 3425.47
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2148.74 3450.1
Nyuu Mihama Town 674.787 3228.34 3471.98
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2153.86 3458.3
Radiation dose in Iwanuma 670.242 3425.47
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2153.86 3458.3
Tsuruga Tsuruga City 655.360 2847.64 3471.98
Shiohama Kawasaki Ward 653.536 2274.06 3471.98
Radiation dose in Kakuda 649.863 3425.47
Sakajiri Mihama Town 649.252 3766.4 3471.98
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2365.43 3471.98
Radiation dose in Onagawa (MP-2) 632.968 3422.74
Kumatori town Nishi primary school Station 631.491 2827.32 3471.98
Oshima Kawasaki Ward 630.402 2167.46 3471.98
Izumisano municipal Oike athletic field Station 629.920 3187.74 3471.98
Atom-kyoudou nursery school Station 625.566 3060.83 3471.98
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2786.72 3471.98
Nakamachi Omaezaki City 623.494 3588.72 3471.98
Uraga Yokosuka City 622.492 1700.45 3471.98
Goritoge Shika Town 622.143 3812.09 3471.98
Kumatori town Minami primary school Station 606.134 3243.56 3471.98
Radiation dose at JAEA Oarai (P1) 603.643 3428.21
Yamanotedai-No.1 Park Station 599.140 3025.29 3471.98
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3444.62
Noumi Shika Town 594.021 3771.46 3471.98
Radiation dose in Watari 591.851 3425.47
Hairando Yokosuka City 588.667 2131.92 3471.98
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2153.86 3458.3
Ningyotoge Kagamino Town 574.857 3025.29 3471.98
Ten-no Kagamino Town 569.960 3624.26 3471.98
Funagura Yokosuka City 563.909 2010.1 3471.98
Chidori Kawasaki Ward 560.211 1944.1 3471.98
Radiation dose at JAEA Oarai (P16) 556.365 3425.47
Shika Shika Town 551.376 3634.41 3471.98
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2360.34 3471.98
Sahara Yokosuka City 547.404 1883.19 3471.98
Kazanashi Shika Town 545.377 3411.07 3471.98
Akasumi Shika Town 544.970 3121.74 3471.98
Kurahashi Maizuru City 540.820 2842.55 3471.98
Obama Obama City 540.809 2543.08 3471.98
Sakuragaike community hall Omaezaki City 540.772 3680.09 3471.98
Shirowa primary school Omaezaki City 535.692 3603.95 3471.98
Radiation dose at JAEA Oarai (P5) 529.759 3425.47
Uenohara Omaezaki City 529.333 3705.49 3471.98
Kumano Shika Town 529.019 3537.98 3471.98
Izumisano municipal Hineno filtration plant Station 527.471 3050.69 3471.98
Nishi-hamasada Matsue City 525.089 3369.69 3455.57
Kouno Minami-Echizen Town 525.028 2558.3 3471.98
Kurihama Yokosuka City 523.708 2035.47 3471.98
Osaka prefectural Kumatori off-site-center Station 522.808 2812.09 3471.98
Ogasa branch Kikugawa City 522.039 3741.43 3458.3
Izumisano municipal Hineno primary scool Station 518.181 2441.57 3471.98
Shirasuna Omaezaki City 499.479 3629.35 3471.98
Jitougata primary school Makinohara City 498.059 3482.13 3471.98
Kataku Matsue City 497.007 2705.5 3471.98
Nishihemi Yokosuka City 496.917 1624.31 3471.98
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3444.62
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2664.9 3471.98
Otomi Takahama Town 494.821 2984.69 3471.98
Otsu Nanao City 493.895 2994.83 3471.98
The Observation point for comparison Tatsunokuchi 493.454 2466.94 3471.98
Hitsuhama Ohi Town 492.630 2776.58 3471.98
Kijiyama Misasa Town 489.284 2817.18 3471.98
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3444.62
Hiraba Omaezaki City 485.878 3629.35 3471.98
Tayu Matsue City 484.956 2822.27 3471.98
Hamaokakita primary school Omaezaki City 484.537 3716.16 3458.3
Oitomi Ayabe City 474.670 3578.58 3471.98
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3444.62
Kashiwazaki-shigai Kashiwazaki City 470.822 2847.64 3471.98
Mitsu Matsue City 466.897 2700.44 3471.98
Tonomachi Kawasaki Ward 463.967 3421.21 3471.98
Daitou branch Kakegawa City 463.829 3660.55 3458.3
Fukura Shika Town 462.493 3405.99 3471.98
Nagasawa Yokosuka City 462.365 1989.78 3471.98
The athletic field Station of Kinki University 461.661 2248.66 3471.98
Koura Matsue City 461.049 3223.25 3471.98
Sakurasan Ward Omaezaki City 459.434 3512.58 3471.98
Tsuchikawa Nanao City 458.915 3314.62 3471.98
Kumatori Town office Station 457.917 2319.74 3471.98
Shinkango Omaezaki City 449.013 4065.88 3471.98
Ogurui Takahama Town 448.279 2659.81 3471.98
Kusabue Omaezaki City 444.162 3832.37 3471.98
Omaezaki City monitoring center 443.946 3761.32 3471.98
Akawase Kagamino Town 442.246 2319.74 3471.98
Ibaraki 442.139 1701.5 3463.78
Hinode Town Yokosuka City 438.324 1340.06 3471.98
Nishiyama Kashiwazaki City 437.251 4030.33 3471.98
Kariwa Kariwa Village 436.307 3040.51 3471.98
Osaka prefectural Hineno high scool Station 435.745 2710.58 3471.98
Miyagawa Kashiwazaki City 435.245 2999.92 3471.98
Radiation dose in Natori 434.640 3425.47
Kami-koubu Matsue City 433.868 2949.15 3471.98
Shimo-Takamachi Kariwa Village 433.192 3309.56 3471.98
Osaka prefectural Sano supporting school Station 432.398 2954.23 3471.98
Arahama Kashiwazaki City 428.874 3091.28 3471.98
Doai Kashiwazaki City 425.681 2908.55 3471.98
Owashi Matsue City 424.452 2883.18 3471.98
Okayasu Maizuru City 422.568 3395.84 3471.98
Katsuyama Kariwa Village 421.280 3091.28 3471.98
Kita-koubu Matsue City 420.683 3162.34 3471.98
Kichisaka Maizuru City 413.065 4126.79 3471.98
Nagai Ohi Town 410.699 2997.9 3463.78
Shiokumi Maizuru City 407.938 5136.92 3471.98
Miyadome Ohi Town 407.831 2487.25 3471.98
Kariwa Kariwa Village 407.617 3202.97 3471.98
Ueno Satsuma-sendai City 394.248 2324.8 3471.98
Power Station-South 389.191 3385.7 3471.98
Radiation dose at JAEA Oarai (P6) 386.963 3425.47
Power Station- 385.546 3304.48 3471.98
Takae Satsuma-sendai City 379.551 2355.25 3471.98
Hokawaduura Genkai Town 378.015 3586.19 3471.98
Kou Itimatsu Suetsugu 377.929 2588.76 3471.98
Minato Satsuma-sendai City 377.656 2157.29 3471.98
Iwanai Iwanai Town 376.336 3514.9 3469.25
Hattari Kyowa Town 373.047 3418.52 3469.25
Chatsu Tomari Village 371.011 3266.36 3469.25
Oyama Maizuru City 358.223 2974.55 3471.98
Kodaira Satsuma-sendai City 355.545 2182.69 3471.98
Kayanuma Tomari Village 354.809 2906.26 3469.25
Anojiri Obama City 353.215 2436.48 3471.98
Kushi Genkai Town 349.738 4949.1 3471.98
Yamaguchi 348.715 3889.15 3463.78
Sadahongou Matsue City 348.228 3030.37 3471.98
Sakibe Karatsu City 347.801 4690.22 3471.98
Hirao Genkai Town 343.814 4944.01 3471.98
The Meteorological Obsevatory of kyowa Town 343.275 3241.01 3469.25
Minami-Horoni Kyowa Town 335.180 3038.12 3469.25
Kounoura Takahama Town 330.353 2568.45 3471.98
Kyoudomarisaki Karatsu City 328.622 5025.24 3471.98
Horikappu Jinja Tomari Village 328.230 3144.63 3469.25
Hukada-kita Matsue City 327.031 2492.31 3471.98
Radiation dose in KEK, Tsukuba 326.240 3444.62
Herokaruusu Tomari Village 324.242 3261.31 3469.25
Yorita Satsuma-sendai City 323.218 2553.22 3471.98
Kamoenai Kamoenai Village 322.032 2754.1 3469.25
Radiation dose in Onagawa (MP-6) 316.267 3422.74
Imamura Genkai Town 314.749 42587.5 3471.98
Yamanaka Takahama Town 314.185 3314.62 3471.98
Sendai (Miyagi) 312.585 1558.7 3463.78
Radiation dose in Onagawa (MP-1) 300.147 3422.74
Gumisaki Satsuma-sendai City 295.693 2060.87 3471.98
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3444.62
Aomori Aomori City 285.372 2094.73 3469.25
Misawa City hall Misawa City 283.728 4062.67 3469.25
Kashu Ikata Town 277.173 2126.83 3471.98
Noheji Town Office Noheji Town 272.004 1795.49 3469.25
Takasimamati 271.103 2263.89 3471.98
Radiation dose in Onagawa (MP-3) 270.563 3422.74
Kucho Ikata Town 269.545 1878.13 3471.98
Radiation dose in Marumori 269.436 3425.47
Kawanagata Ikata Town 266.821 1832.45 3471.98
Tochigi 260.733 2035.73 3463.78
Chikagawa Mutu City 256.719 2338.18 3469.25
Yokohama Town Office Yokohama Town 254.846 2865.69 3469.25
Tokyo 251.877 2400.34 3463.78
Hiranuma Rokkasho Village 251.186 1881.7 3469.25
Taisei Ikata Town 246.293 1375.61 3471.98
Chitose-daira Rokkasho Village 245.868 2028.81 3469.25
Gifu 243.951 3342.24 3463.78
Fukkoshi Yokohama Town 243.102 1967.95 3469.25
Shimane 240.651 3342.24 3463.78
Sunagomata Higashidoori Village 238.012 2845.39 3469.25
Obuchi Rokkasho Village 237.506 2262.1 3469.25
Tomari Rokkasho Village 230.636 3164.93 3469.25
kanagawa 226.339 2096.5 3463.78
Saitama 219.770 1823.04 3463.78
Ikatagoshi Ikata Town 217.515 1730.91 3471.98
Touhoku Branch office Touhoku Town 215.416 1638.25 3469.25
Radiation dose at Tohoku University 214.824 3425.47
Odanosawa Higashidoori Village 210.287 2267.18 3469.25
Kagawa 205.829 2339.57 3463.78
Oippe Higashidoori Village 205.182 1952.73 3469.25
Oita 200.921 2582.64 3463.78
Touhoku Town office Touhoku Town 200.811 7577.57 3469.25
Kuchogoshi Ikata Town 198.646 1756.31 3471.98
Minatoura Ikata Town 186.776 1578.63 3471.98
Radiation dose in Koyadori, Ojika 184.905 3420
Toyama 184.580 4466.45 3463.78
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2153.86 3458.3
Radiation dose in Tukahama, Ojika 183.417 3420
Chiba 182.407 1336.9 3463.78
Nara 182.387 2430.72 3463.78
Okayama 181.976 3159.94 3463.78
Yamagata 181.598 2491.49 3463.78
Ehime 180.745 2248.42 3463.78
Ishikawa 180.445 3873.96 3463.78
Niigata 177.483 4648.75 3463.78
Hiroshima 176.816 2096.5 3463.78
Mie 174.867 2397.3 3463.78
Fukui 170.045 2947.25 3463.78
Radiation dose in Terama, Ojika 168.036 3420
Yamanashi 164.561 1944.58 3463.78
Nagano 162.242 2959.4 3463.78
Saga 161.421 2613.02 3463.78
Tottori 161.392 2400.34 3463.78
Radiation dose in Enoshima, Ojika 160.091 3420
Osaka 159.103 1853.42 3463.78
Ibaraki-city Environment 157.249 3378.96
Aichi 149.345 2248.42 3463.78
Toyonoura Ikata Town 149.214 1812.13 3471.98
Shizuoka 148.639 2324.38 3463.78
Kyoto 144.522 2643.41 3463.78
Kagoshima 144.449 2865.21 3463.78
Tokushima 143.627 2035.73 3463.78
Gunma 143.572 1367.28 3463.78
Hyogo 139.710 2309.18 3463.78
Fukuoka 136.511 2400.34 3463.78
Wakayama 133.857 1701.5 3463.78
Radiation at Tamaki-cho Mie Japan 133.138 3378.96
Akita 132.832 2613.02 3463.78
Shiga 124.919 1853.42 3463.78
Nagasaki 109.459 2096.5 3463.78
Hokkaido 109.189 3190.32 3463.78
Kumamoto 103.568 2035.73 3463.78
Aomori 101.819 3099.17 3463.78
Miyazaki 100.354 2017.5 3463.78
Kochi 95.931 2309.18 3463.78
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2145.34 3444.62
Iwate 90.324 2552.26 3463.78
Environment Feeds from Ohta 83.623 3378.96
Okinawa 82.305 1747.08 3463.78
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 Centrale elettronucleare

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