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Accumulated absorbed dose rate - T=13.03.2011 - 16.01.2017(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 5759.28
Fukushima I MP8 570942.000 5759.28
Fukushima I MP6 240668.000 5759.28
Yamada Futaba Town 176983.000 4461.14 5316.05
Fukushima I MP2 140420.000 5759.28
Fukushima I MP5 111325.000 5759.28
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3631.22 5830.42
Fukushima I MP3 93730.602 5759.28
Fukushima I MP4 86821.500 5759.28
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3631.22 5830.42
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3580.1 5748.34
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3631.22 5830.42
Ono Okuma Town 38610.500 4119.14 5316.05
Shinzan Futaba Town 38332.801 3738.35 5316.05
Fukushima I MP1 31496.801 5759.28
Yonomori Tomioka Town 29815.900 4259.04 5316.05
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3631.22 5830.42
Tomioka Tomioka Town 25324.500 4585.46 5316.05
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3631.22 5830.42
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3631.22 5830.42
Shimo-Kooriyama Tomioka Town 13057.000 4554.41 5316.05
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3631.22 5830.42
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3631.22 5830.42
Kami-kooriyama Tomioka Town 11803.900 3575.14 5316.05
Fukushima II MP3 11060.600 5759.28
Fukushima II MP1 10903.000 5759.28
Kooriyama Futaba Town 10352.900 4165.78 5316.05
Fukushima II MP4 9696.330 5759.28
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3627.82 5824.94
Fukushima II MP5 9382.150 5759.28
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3631.22 5830.42
Matsudate Naraha Town 8410.890 4865.26 5316.05
Shigeoka Naraha Town 8115.970 5378.21 5316.05
Fukushima II MP2 7875.320 5759.28
Namie Namie Town 7321.210 3924.88 5316.05
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5775.7
Fukushima II MP6 7062.690 5759.28
Fukushima II MP7 6511.580 5756.54
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3631.22 5830.42
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3631.22 5830.42
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3631.22 5830.42
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3631.22 5830.42
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3631.22 5830.42
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3631.22 5830.42
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3626.11 5822.21
Futatsunuma Hirono Town 3520.340 4663.2 5316.05
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3631.22 5830.42
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3631.22 5830.42
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5772.96
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3631.22 5830.42
Kiyohashi Namie Town 3162.000 3442.98 5316.05
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3626.11 5822.21
Radiation dose at Agricultural center, Koriyama 3128.960 5772.96
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3631.22 5830.42
Radiation dose at Koriyama city office, Koriyama 2803.520 5772.96
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3631.22 5830.42
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3626.11 5822.21
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3631.22 5830.42
Yamadaoka Naraha Town 2205.340 4134.72 5316.05
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5775.7
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3631.22 5830.42
Kuji Hitachi City 1990.890 9018.24 5841.36
Hitachinaka Hitachinaka City 1951.950 3960.69 5838.62
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3626.11 5822.21
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3626.11 5822.21
Momiyama Hokota City 1837.540 4517.68 5841.36
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3626.11 5822.21
Horiguchi Hitachinaka City 1779.410 3947.33 5844.1
Onuma Hitachi City 1776.950 3363.2 5838.62
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3631.22 5830.42
Tsukuriya Hokota City 1736.890 3800.32 5841.36
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5772.96
Nemoto Hitachioomiya City 1633.190 4233.87 5838.62
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3631.22 5830.42
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3631.22 5830.42
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5781.17
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3631.22 5830.42
Radiation dose at JAEA Oarai (P12) 1512.140 5797.58
Radiation dose at Ose administration center, Koriyama 1494.270 5772.96
Araji Hokota City 1437.760 3808.82 5841.36
Ishigami Tokai Village 1431.690 3467.26 5841.36
Mawatari Hitachinaka City 1422.870 4005.28 5841.36
Radiation dose at JAEA Oarai (P11) 1399.370 5797.58
Onuki Oarai Town 1387.990 4159 5841.36
Sawa Hitachinaka City 1353.770 3141.23 5838.62
Toyooka Tokai Village 1321.760 3817.38 5841.36
Ajigaura Hitachinaka City 1313.890 3755.82 5838.62
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3631.22 5830.42
Geiger Counter Feeds from Asao Kawasaki 1266.620 5751.07
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5772.96
Isohama Oarai Town 1250.540 3626.08 5835.89
Ebisawa Ibaraki Town 1222.240 9843.72 5838.62
Muramatsu Tokai Village 1203.520 3851.56 5841.36
Kamitoda Hokota City 1184.740 3159.82 5841.36
Yanagisawa Hitachinaka City 1166.970 3218.06 5838.62
Tokushuku Hokota City 1159.730 2852.38 5841.36
Tasaki Hokota City 1153.300 3372.93 5811.26
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3631.22 5830.42
Kadobe Naka City 1086.580 7665.34 5838.62
Radiation dose at Date city office, Date 1076.050 5775.7
Oshinobe Tokai Village 1041.340 3595.36 5841.36
Oba Mito City 1037.670 11810.8 5841.36
Godai Naka City 1031.270 3117.08 5841.36
Ishikawa Mito City 1030.810 3673.94 5844.1
Isobe Hitachiota City 1013.130 17729 5841.36
Yatabe Ibaraki Town 996.127 3082.96 5841.36
Radiation dose at Motomiya city office, Motomiya 992.703 5775.7
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3626.11 5822.21
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3626.11 5822.21
Yokobori Naka City 930.280 3612.42 5841.36
Sugaya Naka City 926.186 5519.44 5844.1
Kounosu Naka City 926.087 2818.2 5841.36
Funaishikawa Tokai Village 900.399 3740.52 5841.36
Nukada Naka City 899.900 3378.67 5835.89
Uridura Naka City 890.113 3225.1 5835.89
Shiraki Tsuruga City 881.330 6843.74 5844.1
Motokomezaki Naka City 880.851 3006.17 5808.53
Shiraki pass Tsuruga City 850.284 7168.4 5844.1
Radiation dose in Yamamoto 846.633 5797.58
Yoshizawa Mito City 837.646 3262.3 5841.36
Radiation dose at JAEA Oarai (P7) 831.135 5797.58
Mayumi Hitachiota City 828.119 3236.68 5841.36
Urasoko Tsuruga City 826.465 5681.74 5844.1
Nemoto Hitachioomiya City 825.588 3644.89 5838.62
Takenami Mihama Town 804.283 5963.69 5844.1
Radiation dose at JAEA Oarai (P15) 780.207 5797.58
Tateishi Tsuruga City 780.092 4724.85 5844.1
Radiation dose at JAEA Oarai (P14) 770.174 5797.58
Radiation dose at JAEA Oarai (P13) 769.612 5797.58
Ukishima Kawasaki Ward 735.475 11149.9 5844.1
Kume Hitachiota City 713.958 3168.32 5841.36
Radiation dose at JAEA Oarai (P2) 712.011 5797.58
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3626.11 5822.21
Nyuu Mihama Town 674.787 5433.98 5844.1
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3631.22 5830.42
Radiation dose in Iwanuma 670.242 5797.58
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3631.22 5830.42
Tsuruga Tsuruga City 655.360 4793.18 5844.1
Shiohama Kawasaki Ward 653.536 3827.73 5844.1
Radiation dose in Kakuda 649.863 5797.58
Sakajiri Mihama Town 649.252 6339.67 5844.1
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3981.52 5844.1
Radiation dose in Onagawa (MP-2) 632.968 5794.85
Kumatori town Nishi primary school Station 631.491 4758.99 5844.1
Oshima Kawasaki Ward 630.402 3648.31 5844.1
Izumisano municipal Oike athletic field Station 629.920 5365.65 5844.1
Atom-kyoudou nursery school Station 625.566 5152.03 5844.1
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4690.66 5844.1
Nakamachi Omaezaki City 623.494 6040.59 5844.1
Uraga Yokosuka City 622.492 2862.22 5844.1
Goritoge Shika Town 622.143 6416.56 5844.1
Kumatori town Minami primary school Station 606.134 5459.62 5844.1
Radiation dose at JAEA Oarai (P1) 603.643 5800.32
Yamanotedai-No.1 Park Station 599.140 5092.21 5844.1
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 5816.74
Noumi Shika Town 594.021 6348.17 5844.1
Radiation dose in Watari 591.851 5797.58
Hairando Yokosuka City 588.667 3588.48 5844.1
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3631.22 5830.42
Ningyotoge Kagamino Town 574.857 5092.21 5844.1
Ten-no Kagamino Town 569.960 6100.42 5844.1
Funagura Yokosuka City 563.909 3383.42 5844.1
Chidori Kawasaki Ward 560.211 3272.33 5844.1
Radiation dose at JAEA Oarai (P16) 556.365 5797.58
Shika Shika Town 551.376 6117.49 5844.1
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3972.96 5844.1
Sahara Yokosuka City 547.404 3169.81 5844.1
Kazanashi Shika Town 545.377 5741.57 5844.1
Akasumi Shika Town 544.970 5254.56 5844.1
Kurahashi Maizuru City 540.820 4784.62 5844.1
Obama Obama City 540.809 4280.54 5844.1
Sakuragaike community hall Omaezaki City 540.772 6194.38 5844.1
Shirowa primary school Omaezaki City 535.692 6066.22 5844.1
Radiation dose at JAEA Oarai (P5) 529.759 5797.58
Uenohara Omaezaki City 529.333 6237.14 5844.1
Kumano Shika Town 529.019 5955.19 5844.1
Izumisano municipal Hineno filtration plant Station 527.471 5134.96 5844.1
Nishi-hamasada Matsue City 525.089 5682.86 5827.68
Kouno Minami-Echizen Town 525.028 4306.18 5844.1
Kurihama Yokosuka City 523.708 3426.13 5844.1
Osaka prefectural Kumatori off-site-center Station 522.808 4733.36 5844.1
Ogasa branch Kikugawa City 522.039 6307.74 5830.42
Izumisano municipal Hineno primary scool Station 518.181 4109.68 5844.1
Shirasuna Omaezaki City 499.479 6108.98 5844.1
Jitougata primary school Makinohara City 498.059 5861.17 5844.1
Kataku Matsue City 497.007 4553.93 5844.1
Nishihemi Yokosuka City 496.917 2734.06 5844.1
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 5816.74
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4485.6 5844.1
Otomi Takahama Town 494.821 5023.87 5844.1
Otsu Nanao City 493.895 5040.94 5844.1
The Observation point for comparison Tatsunokuchi 493.454 4152.38 5844.1
Hitsuhama Ohi Town 492.630 4673.59 5844.1
Kijiyama Misasa Town 489.284 4741.92 5844.1
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 5816.74
Hiraba Omaezaki City 485.878 6108.98 5844.1
Tayu Matsue City 484.956 4750.48 5844.1
Hamaokakita primary school Omaezaki City 484.537 6265.14 5830.42
Oitomi Ayabe City 474.670 6023.52 5844.1
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 5816.74
Kashiwazaki-shigai Kashiwazaki City 470.822 4793.18 5844.1
Mitsu Matsue City 466.897 4545.42 5844.1
Tonomachi Kawasaki Ward 463.967 5758.64 5844.1
Daitou branch Kakegawa City 463.829 6171.39 5830.42
Fukura Shika Town 462.493 5733.01 5844.1
Nagasawa Yokosuka City 462.365 3349.23 5844.1
The athletic field Station of Kinki University 461.661 3784.98 5844.1
Koura Matsue City 461.049 5425.42 5844.1
Sakurasan Ward Omaezaki City 459.434 5912.43 5844.1
Tsuchikawa Nanao City 458.915 5579.21 5844.1
Kumatori Town office Station 457.917 3904.63 5844.1
Shinkango Omaezaki City 449.013 6843.74 5844.1
Ogurui Takahama Town 448.279 4477.04 5844.1
Kusabue Omaezaki City 444.162 6450.7 5844.1
Omaezaki City monitoring center 443.946 6331.1 5844.1
Akawase Kagamino Town 442.246 3904.63 5844.1
Ibaraki 442.139 2866.75 5835.89
Hinode Town Yokosuka City 438.324 2255.62 5844.1
Nishiyama Kashiwazaki City 437.251 6783.92 5844.1
Kariwa Kariwa Village 436.307 5117.84 5844.1
Osaka prefectural Hineno high scool Station 435.745 4562.5 5844.1
Miyagawa Kashiwazaki City 435.245 5049.5 5844.1
Radiation dose in Natori 434.640 5797.58
Kami-koubu Matsue City 433.868 4964.05 5844.1
Shimo-Takamachi Kariwa Village 433.192 5570.71 5844.1
Osaka prefectural Sano supporting school Station 432.398 4972.61 5844.1
Arahama Kashiwazaki City 428.874 5203.3 5844.1
Doai Kashiwazaki City 425.681 4895.71 5844.1
Owashi Matsue City 424.452 4853.01 5844.1
Okayasu Maizuru City 422.568 5715.94 5844.1
Katsuyama Kariwa Village 421.280 5203.3 5844.1
Kita-koubu Matsue City 420.683 5322.9 5844.1
Kichisaka Maizuru City 413.065 6946.27 5844.1
Nagai Ohi Town 410.699 5050.96 5835.89
Shiokumi Maizuru City 407.938 8646.54 5844.1
Miyadome Ohi Town 407.831 4186.58 5844.1
Kariwa Kariwa Village 407.617 5391.28 5844.1
Ueno Satsuma-sendai City 394.248 3913.14 5844.1
Power Station-South 389.191 5698.87 5844.1
Radiation dose at JAEA Oarai (P6) 386.963 5797.58
Power Station- 385.546 5562.14 5844.1
Takae Satsuma-sendai City 379.551 3964.4 5844.1
Hokawaduura Genkai Town 378.015 6036.34 5844.1
Kou Itimatsu Suetsugu 377.929 4357.44 5844.1
Minato Satsuma-sendai City 377.656 3631.18 5844.1
Iwanai Iwanai Town 376.336 5918.22 5841.36
Hattari Kyowa Town 373.047 5755.94 5841.36
Chatsu Tomari Village 371.011 5499.74 5841.36
Oyama Maizuru City 358.223 5006.8 5844.1
Kodaira Satsuma-sendai City 355.545 3673.94 5844.1
Kayanuma Tomari Village 354.809 4893.42 5841.36
Anojiri Obama City 353.215 4101.12 5844.1
Kushi Genkai Town 349.738 8330.4 5844.1
Yamaguchi 348.715 6552.58 5835.89
Sadahongou Matsue City 348.228 5100.77 5844.1
Sakibe Karatsu City 347.801 7894.66 5844.1
Hirao Genkai Town 343.814 8321.84 5844.1
The Meteorological Obsevatory of kyowa Town 343.275 5457.06 5841.36
Minami-Horoni Kyowa Town 335.180 5115.44 5841.36
Kounoura Takahama Town 330.353 4323.25 5844.1
Kyoudomarisaki Karatsu City 328.622 8458.56 5844.1
Horikappu Jinja Tomari Village 328.230 5294.78 5841.36
Hukada-kita Matsue City 327.031 4195.09 5844.1
Radiation dose in KEK, Tsukuba 326.240 5816.74
Herokaruusu Tomari Village 324.242 5491.24 5841.36
Yorita Satsuma-sendai City 323.218 4297.62 5844.1
Kamoenai Kamoenai Village 322.032 4637.22 5841.36
Radiation dose in Onagawa (MP-6) 316.267 5794.85
Imamura Genkai Town 314.749 71684 5844.1
Yamanaka Takahama Town 314.185 5579.21 5844.1
Sendai (Miyagi) 312.585 2626.15 5835.89
Radiation dose in Onagawa (MP-1) 300.147 5794.85
Gumisaki Satsuma-sendai City 295.693 3468.88 5844.1
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 5816.74
Aomori Aomori City 285.372 3527 5841.36
Misawa City hall Misawa City 283.728 6840.54 5841.36
Kashu Ikata Town 277.173 3579.92 5844.1
Noheji Town Office Noheji Town 272.004 3023.16 5841.36
Takasimamati 271.103 3810.61 5844.1
Radiation dose in Onagawa (MP-3) 270.563 5794.85
Kucho Ikata Town 269.545 3161.3 5844.1
Radiation dose in Marumori 269.436 5797.58
Kawanagata Ikata Town 266.821 3084.4 5844.1
Tochigi 260.733 3429.86 5835.89
Chikagawa Mutu City 256.719 3936.92 5841.36
Yokohama Town Office Yokohama Town 254.846 4825.12 5841.36
Tokyo 251.877 4044.17 5835.89
Hiranuma Rokkasho Village 251.186 3168.32 5841.36
Taisei Ikata Town 246.293 2315.44 5844.1
Chitose-daira Rokkasho Village 245.868 3416.02 5841.36
Gifu 243.951 5631.12 5835.89
Fukkoshi Yokohama Town 243.102 3313.54 5841.36
Shimane 240.651 5631.12 5835.89
Sunagomata Higashidoori Village 238.012 4790.94 5841.36
Obuchi Rokkasho Village 237.506 3808.82 5841.36
Tomari Rokkasho Village 230.636 5328.96 5841.36
kanagawa 226.339 3532.25 5835.89
Saitama 219.770 3071.52 5835.89
Ikatagoshi Ikata Town 217.515 2913.49 5844.1
Touhoku Branch office Touhoku Town 215.416 2758.4 5841.36
Radiation dose at Tohoku University 214.824 5797.58
Odanosawa Higashidoori Village 210.287 3817.38 5841.36
Kagawa 205.829 3941.78 5835.89
Oippe Higashidoori Village 205.182 3287.92 5841.36
Oita 200.921 4351.32 5835.89
Touhoku Town office Touhoku Town 200.811 12758.8 5841.36
Kuchogoshi Ikata Town 198.646 2956.24 5844.1
Minatoura Ikata Town 186.776 2657.17 5844.1
Radiation dose in Koyadori, Ojika 184.905 5792.11
Toyama 184.580 7525.22 5835.89
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3631.22 5830.42
Radiation dose in Tukahama, Ojika 183.417 5792.11
Chiba 182.407 2252.45 5835.89
Nara 182.387 4095.36 5835.89
Okayama 181.976 5323.97 5835.89
Yamagata 181.598 4197.74 5835.89
Ehime 180.745 3788.21 5835.89
Ishikawa 180.445 6526.98 5835.89
Niigata 177.483 7832.38 5835.89
Hiroshima 176.816 3532.25 5835.89
Mie 174.867 4039.05 5835.89
Fukui 170.045 4965.62 5835.89
Radiation dose in Terama, Ojika 168.036 5792.11
Yamanashi 164.561 3276.29 5835.89
Nagano 162.242 4986.1 5835.89
Saga 161.421 4402.51 5835.89
Tottori 161.392 4044.17 5835.89
Radiation dose in Enoshima, Ojika 160.091 5792.11
Osaka 159.103 3122.71 5835.89
Ibaraki-city Environment 157.249 5751.07
Aichi 149.345 3788.21 5835.89
Toyonoura Ikata Town 149.214 3050.21 5844.1
Shizuoka 148.639 3916.19 5835.89
Kyoto 144.522 4453.7 5835.89
Kagoshima 144.449 4827.41 5835.89
Tokushima 143.627 3429.86 5835.89
Gunma 143.572 2303.64 5835.89
Hyogo 139.710 3890.59 5835.89
Fukuoka 136.511 4044.17 5835.89
Wakayama 133.857 2866.75 5835.89
Radiation at Tamaki-cho Mie Japan 133.138 5751.07
Akita 132.832 4402.51 5835.89
Shiga 124.919 3122.71 5835.89
Nagasaki 109.459 3532.25 5835.89
Hokkaido 109.189 5375.16 5835.89
Kumamoto 103.568 3429.86 5835.89
Aomori 101.819 5221.58 5835.89
Miyazaki 100.354 3399.15 5835.89
Kochi 95.931 3890.59 5835.89
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3622.7 5816.74
Iwate 90.324 4300.13 5835.89
Environment Feeds from Ohta 83.623 5751.07
Okinawa 82.305 2943.54 5835.89
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