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Accumulated absorbed dose rate - T=13.03.2011 - 26.04.2015(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 4032.86
Fukushima I MP8 570942.000 4032.86
Fukushima I MP6 240668.000 4032.86
Yamada Futaba Town 176983.000 3012.36 3589.63
Fukushima I MP2 140420.000 4032.86
Fukushima I MP5 111325.000 4032.86
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2556 4104
Fukushima I MP3 93730.602 4032.86
Fukushima I MP4 86821.500 4032.86
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2556 4104
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2504.88 4021.92
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2556 4104
Ono Okuma Town 38610.500 2781.43 3589.63
Shinzan Futaba Town 38332.801 2524.3 3589.63
Fukushima I MP1 31496.801 4032.86
Yonomori Tomioka Town 29815.900 2875.89 3589.63
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2556 4104
Tomioka Tomioka Town 25324.500 3096.31 3589.63
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2556 4104
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2556 4104
Shimo-Kooriyama Tomioka Town 13057.000 3075.34 3589.63
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2556 4104
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2556 4104
Kami-kooriyama Tomioka Town 11803.900 2414.09 3589.63
Fukushima II MP3 11060.600 4032.86
Fukushima II MP1 10903.000 4032.86
Kooriyama Futaba Town 10352.900 2812.92 3589.63
Fukushima II MP4 9696.330 4032.86
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2552.59 4098.53
Fukushima II MP5 9382.150 4032.86
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2556 4104
Matsudate Naraha Town 8410.890 3285.24 3589.63
Shigeoka Naraha Town 8115.970 3631.61 3589.63
Fukushima II MP2 7875.320 4032.86
Namie Namie Town 7321.210 2650.25 3589.63
Radiation dose at Shirasawa branch office, Motomiya 7287.920 4049.28
Fukushima II MP6 7062.690 4032.86
Fukushima II MP7 6511.580 4030.13
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2556 4104
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2556 4104
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2556 4104
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2556 4104
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2556 4104
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2556 4104
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2550.89 4095.79
Futatsunuma Hirono Town 3520.340 3148.8 3589.63
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2556 4104
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2556 4104
Radiation dose at Koriyama joint government building, Koriyama 3232.890 4046.54
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2556 4104
Kiyohashi Namie Town 3162.000 2324.85 3589.63
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2550.89 4095.79
Radiation dose at Agricultural center, Koriyama 3128.960 4046.54
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2556 4104
Radiation dose at Koriyama city office, Koriyama 2803.520 4046.54
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2556 4104
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2550.89 4095.79
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2556 4104
Yamadaoka Naraha Town 2205.340 2791.95 3589.63
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 4049.28
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2556 4104
Kuji Hitachi City 1990.890 6352.9 4114.94
Hitachinaka Hitachinaka City 1951.950 2789.56 4112.21
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2550.89 4095.79
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2550.89 4095.79
Momiyama Hokota City 1837.540 3182.48 4114.94
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2550.89 4095.79
Horiguchi Hitachinaka City 1779.410 2781.24 4117.68
Onuma Hitachi City 1776.950 2368.74 4112.21
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2556 4104
Tsukuriya Hokota City 1736.890 2677.13 4114.94
Radiation dose at Big palette Fukushima, Koriyama 1668.540 4046.54
Nemoto Hitachioomiya City 1633.190 2981.96 4112.21
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2556 4104
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2556 4104
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 4054.75
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2556 4104
Radiation dose at JAEA Oarai (P12) 1512.140 4071.17
Radiation dose at Ose administration center, Koriyama 1494.270 4046.54
Araji Hokota City 1437.760 2683.12 4114.94
Ishigami Tokai Village 1431.690 2442.51 4114.94
Mawatari Hitachinaka City 1422.870 2821.52 4114.94
Radiation dose at JAEA Oarai (P11) 1399.370 4071.17
Onuki Oarai Town 1387.990 2929.8 4114.94
Sawa Hitachinaka City 1353.770 2212.4 4112.21
Toyooka Tokai Village 1321.760 2689.15 4114.94
Ajigaura Hitachinaka City 1313.890 2645.27 4112.21
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2556 4104
Geiger Counter Feeds from Asao Kawasaki 1266.620 4024.66
Radiation dose at Tamokami elementary school, Koriyama 1256.140 4046.54
Isohama Oarai Town 1250.540 2553.39 4109.47
Ebisawa Ibaraki Town 1222.240 6933.04 4112.21
Muramatsu Tokai Village 1203.520 2713.23 4114.94
Kamitoda Hokota City 1184.740 2225.93 4114.94
Yanagisawa Hitachinaka City 1166.970 2266.51 4112.21
Tokushuku Hokota City 1159.730 2009.36 4114.94
Tasaki Hokota City 1153.300 2370.9 4084.85
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2556 4104
Kadobe Naka City 1086.580 5398.79 4112.21
Radiation dose at Date city office, Date 1076.050 4049.28
Oshinobe Tokai Village 1041.340 2532.75 4114.94
Oba Mito City 1037.670 8320.13 4114.94
Godai Naka City 1031.270 2195.83 4114.94
Ishikawa Mito City 1030.810 2588.61 4117.68
Isobe Hitachiota City 1013.130 12489.2 4114.94
Yatabe Ibaraki Town 996.127 2171.79 4114.94
Radiation dose at Motomiya city office, Motomiya 992.703 4049.28
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2550.89 4095.79
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2550.89 4095.79
Yokobori Naka City 930.280 2544.77 4114.94
Sugaya Naka City 926.186 3888.93 4117.68
Kounosu Naka City 926.087 1985.28 4114.94
Funaishikawa Tokai Village 900.399 2635.01 4114.94
Nukada Naka City 899.900 2379.17 4109.47
Uridura Naka City 890.113 2271.02 4109.47
Shiraki Tsuruga City 881.330 4822.02 4117.68
Motokomezaki Naka City 880.851 2112.67 4082.11
Shiraki pass Tsuruga City 850.284 5050.77 4117.68
Radiation dose in Yamamoto 846.633 4071.17
Yoshizawa Mito City 837.646 2298.12 4114.94
Radiation dose at JAEA Oarai (P7) 831.135 4071.17
Mayumi Hitachiota City 828.119 2280.08 4114.94
Urasoko Tsuruga City 826.465 4003.29 4117.68
Nemoto Hitachioomiya City 825.588 2567.14 4112.21
Takenami Mihama Town 804.283 4201.95 4117.68
Radiation dose at JAEA Oarai (P15) 780.207 4071.17
Tateishi Tsuruga City 780.092 3329.07 4117.68
Radiation dose at JAEA Oarai (P14) 770.174 4071.17
Radiation dose at JAEA Oarai (P13) 769.612 4071.17
Ukishima Kawasaki Ward 735.475 7856.1 4117.68
Kume Hitachiota City 713.958 2231.92 4114.94
Radiation dose at JAEA Oarai (P2) 712.011 4071.17
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2550.89 4095.79
Nyuu Mihama Town 674.787 3828.72 4117.68
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2556 4104
Radiation dose in Iwanuma 670.242 4071.17
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2556 4104
Tsuruga Tsuruga City 655.360 3377.22 4117.68
Shiohama Kawasaki Ward 653.536 2696.97 4117.68
Radiation dose in Kakuda 649.863 4071.17
Sakajiri Mihama Town 649.252 4466.85 4117.68
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2805.33 4117.68
Radiation dose in Onagawa (MP-2) 632.968 4068.43
Kumatori town Nishi primary school Station 631.491 3353.13 4117.68
Oshima Kawasaki Ward 630.402 2570.55 4117.68
Izumisano municipal Oike athletic field Station 629.920 3780.57 4117.68
Atom-kyoudou nursery school Station 625.566 3630.06 4117.68
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3304.98 4117.68
Nakamachi Omaezaki City 623.494 4256.13 4117.68
Uraga Yokosuka City 622.492 2016.69 4117.68
Goritoge Shika Town 622.143 4521.03 4117.68
Kumatori town Minami primary school Station 606.134 3846.78 4117.68
Radiation dose at JAEA Oarai (P1) 603.643 4073.9
Yamanotedai-No.1 Park Station 599.140 3587.91 4117.68
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4090.32
Noumi Shika Town 594.021 4472.85 4117.68
Radiation dose in Watari 591.851 4071.17
Hairando Yokosuka City 588.667 2528.4 4117.68
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2556 4104
Ningyotoge Kagamino Town 574.857 3587.91 4117.68
Ten-no Kagamino Town 569.960 4298.28 4117.68
Funagura Yokosuka City 563.909 2383.92 4117.68
Chidori Kawasaki Ward 560.211 2305.65 4117.68
Radiation dose at JAEA Oarai (P16) 556.365 4071.17
Shika Shika Town 551.376 4310.31 4117.68
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2799.3 4117.68
Sahara Yokosuka City 547.404 2233.41 4117.68
Kazanashi Shika Town 545.377 4045.44 4117.68
Akasumi Shika Town 544.970 3702.3 4117.68
Kurahashi Maizuru City 540.820 3371.19 4117.68
Obama Obama City 540.809 3016.02 4117.68
Sakuragaike community hall Omaezaki City 540.772 4364.49 4117.68
Shirowa primary school Omaezaki City 535.692 4274.19 4117.68
Radiation dose at JAEA Oarai (P5) 529.759 4071.17
Uenohara Omaezaki City 529.333 4394.61 4117.68
Kumano Shika Town 529.019 4195.95 4117.68
Izumisano municipal Hineno filtration plant Station 527.471 3618.03 4117.68
Nishi-hamasada Matsue City 525.089 3999.34 4101.26
Kouno Minami-Echizen Town 525.028 3034.08 4117.68
Kurihama Yokosuka City 523.708 2414.01 4117.68
Osaka prefectural Kumatori off-site-center Station 522.808 3335.07 4117.68
Ogasa branch Kikugawa City 522.039 4439.99 4104
Izumisano municipal Hineno primary scool Station 518.181 2895.63 4117.68
Shirasuna Omaezaki City 499.479 4304.31 4117.68
Jitougata primary school Makinohara City 498.059 4129.71 4117.68
Kataku Matsue City 497.007 3208.65 4117.68
Nishihemi Yokosuka City 496.917 1926.39 4117.68
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4090.32
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3160.5 4117.68
Otomi Takahama Town 494.821 3539.76 4117.68
Otsu Nanao City 493.895 3551.79 4117.68
The Observation point for comparison Tatsunokuchi 493.454 2925.72 4117.68
Hitsuhama Ohi Town 492.630 3292.95 4117.68
Kijiyama Misasa Town 489.284 3341.1 4117.68
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4090.32
Hiraba Omaezaki City 485.878 4304.31 4117.68
Tayu Matsue City 484.956 3347.13 4117.68
Hamaokakita primary school Omaezaki City 484.537 4410 4104
Oitomi Ayabe City 474.670 4244.1 4117.68
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4090.32
Kashiwazaki-shigai Kashiwazaki City 470.822 3377.22 4117.68
Mitsu Matsue City 466.897 3202.65 4117.68
Tonomachi Kawasaki Ward 463.967 4057.47 4117.68
Daitou branch Kakegawa City 463.829 4344.01 4104
Fukura Shika Town 462.493 4039.41 4117.68
Nagasawa Yokosuka City 462.365 2359.83 4117.68
The athletic field Station of Kinki University 461.661 2666.85 4117.68
Koura Matsue City 461.049 3822.69 4117.68
Sakurasan Ward Omaezaki City 459.434 4165.83 4117.68
Tsuchikawa Nanao City 458.915 3931.05 4117.68
Kumatori Town office Station 457.917 2751.15 4117.68
Shinkango Omaezaki City 449.013 4822.02 4117.68
Ogurui Takahama Town 448.279 3154.47 4117.68
Kusabue Omaezaki City 444.162 4545.09 4117.68
Omaezaki City monitoring center 443.946 4460.82 4117.68
Akawase Kagamino Town 442.246 2751.15 4117.68
Ibaraki 442.139 2018.69 4109.47
Hinode Town Yokosuka City 438.324 1589.28 4117.68
Nishiyama Kashiwazaki City 437.251 4779.87 4117.68
Kariwa Kariwa Village 436.307 3605.97 4117.68
Osaka prefectural Hineno high scool Station 435.745 3214.68 4117.68
Miyagawa Kashiwazaki City 435.245 3557.82 4117.68
Radiation dose in Natori 434.640 4071.17
Kami-koubu Matsue City 433.868 3497.61 4117.68
Shimo-Takamachi Kariwa Village 433.192 3925.05 4117.68
Osaka prefectural Sano supporting school Station 432.398 3503.64 4117.68
Arahama Kashiwazaki City 428.874 3666.18 4117.68
Doai Kashiwazaki City 425.681 3449.46 4117.68
Owashi Matsue City 424.452 3419.37 4117.68
Okayasu Maizuru City 422.568 4027.38 4117.68
Katsuyama Kariwa Village 421.280 3666.18 4117.68
Kita-koubu Matsue City 420.683 3750.45 4117.68
Kichisaka Maizuru City 413.065 4894.26 4117.68
Nagai Ohi Town 410.699 3556.75 4109.47
Shiokumi Maizuru City 407.938 6092.25 4117.68
Miyadome Ohi Town 407.831 2949.81 4117.68
Kariwa Kariwa Village 407.617 3798.63 4117.68
Ueno Satsuma-sendai City 394.248 2757.15 4117.68
Power Station-South 389.191 4015.35 4117.68
Radiation dose at JAEA Oarai (P6) 386.963 4071.17
Power Station- 385.546 3919.02 4117.68
Takae Satsuma-sendai City 379.551 2793.27 4117.68
Hokawaduura Genkai Town 378.015 4253.13 4117.68
Kou Itimatsu Suetsugu 377.929 3070.2 4117.68
Minato Satsuma-sendai City 377.656 2558.49 4117.68
Iwanai Iwanai Town 376.336 4169.09 4114.94
Hattari Kyowa Town 373.047 4054.77 4114.94
Chatsu Tomari Village 371.011 3874.29 4114.94
Oyama Maizuru City 358.223 3527.73 4117.68
Kodaira Satsuma-sendai City 355.545 2588.61 4117.68
Kayanuma Tomari Village 354.809 3447.17 4114.94
Anojiri Obama City 353.215 2889.6 4117.68
Kushi Genkai Town 349.738 5869.5 4117.68
Yamaguchi 348.715 4614.14 4109.47
Sadahongou Matsue City 348.228 3593.94 4117.68
Sakibe Karatsu City 347.801 5562.48 4117.68
Hirao Genkai Town 343.814 5863.47 4117.68
The Meteorological Obsevatory of kyowa Town 343.275 3844.22 4114.94
Minami-Horoni Kyowa Town 335.180 3603.57 4114.94
Kounoura Takahama Town 330.353 3046.11 4117.68
Kyoudomarisaki Karatsu City 328.622 5959.8 4117.68
Horikappu Jinja Tomari Village 328.230 3729.91 4114.94
Hukada-kita Matsue City 327.031 2955.81 4117.68
Radiation dose in KEK, Tsukuba 326.240 4090.32
Herokaruusu Tomari Village 324.242 3868.3 4114.94
Yorita Satsuma-sendai City 323.218 3028.05 4117.68
Kamoenai Kamoenai Village 322.032 3266.69 4114.94
Radiation dose in Onagawa (MP-6) 316.267 4068.43
Imamura Genkai Town 314.749 50507.7 4117.68
Yamanaka Takahama Town 314.185 3931.05 4117.68
Sendai (Miyagi) 312.585 1849.26 4109.47
Radiation dose in Onagawa (MP-1) 300.147 4068.43
Gumisaki Satsuma-sendai City 295.693 2444.13 4117.68
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4090.32
Aomori Aomori City 285.372 2484.6 4114.94
Misawa City hall Misawa City 283.728 4818.82 4114.94
Kashu Ikata Town 277.173 2522.37 4117.68
Noheji Town Office Noheji Town 272.004 2129.66 4114.94
Takasimamati 271.103 2684.91 4117.68
Radiation dose in Onagawa (MP-3) 270.563 4068.43
Kucho Ikata Town 269.545 2227.41 4117.68
Radiation dose in Marumori 269.436 4071.17
Kawanagata Ikata Town 266.821 2173.23 4117.68
Tochigi 260.733 2415.22 4109.47
Chikagawa Mutu City 256.719 2773.36 4114.94
Yokohama Town Office Yokohama Town 254.846 3399.05 4114.94
Tokyo 251.877 2847.79 4109.47
Hiranuma Rokkasho Village 251.186 2231.92 4114.94
Taisei Ikata Town 246.293 1631.43 4117.68
Chitose-daira Rokkasho Village 245.868 2406.41 4114.94
Gifu 243.951 3965.28 4109.47
Fukkoshi Yokohama Town 243.102 2334.22 4114.94
Shimane 240.651 3965.28 4109.47
Sunagomata Higashidoori Village 238.012 3374.98 4114.94
Obuchi Rokkasho Village 237.506 2683.12 4114.94
Tomari Rokkasho Village 230.636 3753.98 4114.94
kanagawa 226.339 2487.31 4109.47
Saitama 219.770 2162.88 4109.47
Ikatagoshi Ikata Town 217.515 2052.81 4117.68
Touhoku Branch office Touhoku Town 215.416 1943.16 4114.94
Radiation dose at Tohoku University 214.824 4071.17
Odanosawa Higashidoori Village 210.287 2689.15 4114.94
Kagawa 205.829 2775.7 4109.47
Oippe Higashidoori Village 205.182 2316.17 4114.94
Oita 200.921 3064.08 4109.47
Touhoku Town office Touhoku Town 200.811 8987.9 4114.94
Kuchogoshi Ikata Town 198.646 2082.93 4117.68
Minatoura Ikata Town 186.776 1872.21 4117.68
Radiation dose in Koyadori, Ojika 184.905 4065.7
Toyama 184.580 5299.06 4109.47
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2556 4104
Radiation dose in Tukahama, Ojika 183.417 4065.7
Chiba 182.407 1586.11 4109.47
Nara 182.387 2883.84 4109.47
Okayama 181.976 3748.99 4109.47
Yamagata 181.598 2955.94 4109.47
Ehime 180.745 2667.55 4109.47
Ishikawa 180.445 4596.12 4109.47
Niigata 177.483 5515.34 4109.47
Hiroshima 176.816 2487.31 4109.47
Mie 174.867 2844.19 4109.47
Fukui 170.045 3496.66 4109.47
Radiation dose in Terama, Ojika 168.036 4065.7
Yamanashi 164.561 2307.07 4109.47
Nagano 162.242 3511.08 4109.47
Saga 161.421 3100.13 4109.47
Tottori 161.392 2847.79 4109.47
Radiation dose in Enoshima, Ojika 160.091 4065.7
Osaka 159.103 2198.93 4109.47
Ibaraki-city Environment 157.249 4024.66
Aichi 149.345 2667.55 4109.47
Toyonoura Ikata Town 149.214 2149.14 4117.68
Shizuoka 148.639 2757.67 4109.47
Kyoto 144.522 3136.18 4109.47
Kagoshima 144.449 3399.33 4109.47
Tokushima 143.627 2415.22 4109.47
Gunma 143.572 1622.16 4109.47
Hyogo 139.710 2739.65 4109.47
Fukuoka 136.511 2847.79 4109.47
Wakayama 133.857 2018.69 4109.47
Radiation at Tamaki-cho Mie Japan 133.138 4024.66
Akita 132.832 3100.13 4109.47
Shiga 124.919 2198.93 4109.47
Nagasaki 109.459 2487.31 4109.47
Hokkaido 109.189 3785.04 4109.47
Kumamoto 103.568 2415.22 4109.47
Aomori 101.819 3676.9 4109.47
Miyazaki 100.354 2393.59 4109.47
Kochi 95.931 2739.65 4109.47
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2547.48 4090.32
Iwate 90.324 3028.03 4109.47
Environment Feeds from Ohta 83.623 4024.66
Okinawa 82.305 2072.76 4109.47
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