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Accumulated absorbed dose rate - T=13.03.2011 - 31.05.2016(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 5130
Fukushima I MP8 570942.000 5130
Fukushima I MP6 240668.000 5130
Yamada Futaba Town 176983.000 3933.06 4686.77
Fukushima I MP2 140420.000 5130
Fukushima I MP5 111325.000 5130
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3239.3 5201.14
Fukushima I MP3 93730.602 5130
Fukushima I MP4 86821.500 5130
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3239.3 5201.14
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3188.18 5119.06
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3239.3 5201.14
Ono Okuma Town 38610.500 3631.55 4686.77
Shinzan Futaba Town 38332.801 3295.83 4686.77
Fukushima I MP1 31496.801 5130
Yonomori Tomioka Town 29815.900 3754.88 4686.77
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3239.3 5201.14
Tomioka Tomioka Town 25324.500 4042.67 4686.77
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3239.3 5201.14
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3239.3 5201.14
Shimo-Kooriyama Tomioka Town 13057.000 4015.29 4686.77
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3239.3 5201.14
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3239.3 5201.14
Kami-kooriyama Tomioka Town 11803.900 3151.93 4686.77
Fukushima II MP3 11060.600 5130
Fukushima II MP1 10903.000 5130
Kooriyama Futaba Town 10352.900 3672.66 4686.77
Fukushima II MP4 9696.330 5130
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3235.9 5195.66
Fukushima II MP5 9382.150 5130
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3239.3 5201.14
Matsudate Naraha Town 8410.890 4289.34 4686.77
Shigeoka Naraha Town 8115.970 4741.57 4686.77
Fukushima II MP2 7875.320 5130
Namie Namie Town 7321.210 3460.27 4686.77
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5146.42
Fukushima II MP6 7062.690 5130
Fukushima II MP7 6511.580 5127.26
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3239.3 5201.14
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3239.3 5201.14
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3239.3 5201.14
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3239.3 5201.14
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3239.3 5201.14
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3239.3 5201.14
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3234.19 5192.93
Futatsunuma Hirono Town 3520.340 4111.2 4686.77
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3239.3 5201.14
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3239.3 5201.14
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5143.68
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3239.3 5201.14
Kiyohashi Namie Town 3162.000 3035.42 4686.77
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3234.19 5192.93
Radiation dose at Agricultural center, Koriyama 3128.960 5143.68
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3239.3 5201.14
Radiation dose at Koriyama city office, Koriyama 2803.520 5143.68
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3239.3 5201.14
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3234.19 5192.93
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3239.3 5201.14
Yamadaoka Naraha Town 2205.340 3645.28 4686.77
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5146.42
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3239.3 5201.14
Kuji Hitachi City 1990.890 8046.72 5212.08
Hitachinaka Hitachinaka City 1951.950 3533.81 5209.34
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3234.19 5192.93
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3234.19 5192.93
Momiyama Hokota City 1837.540 4031 5212.08
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3234.19 5192.93
Horiguchi Hitachinaka City 1779.410 3522.29 5214.82
Onuma Hitachi City 1776.950 3000.72 5209.34
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3239.3 5201.14
Tsukuriya Hokota City 1736.890 3390.92 5212.08
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5143.68
Nemoto Hitachioomiya City 1633.190 3777.55 5209.34
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3239.3 5201.14
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3239.3 5201.14
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5151.89
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3239.3 5201.14
Radiation dose at JAEA Oarai (P12) 1512.140 5168.3
Radiation dose at Ose administration center, Koriyama 1494.270 5143.68
Araji Hokota City 1437.760 3398.5 5212.08
Ishigami Tokai Village 1431.690 3093.74 5212.08
Mawatari Hitachinaka City 1422.870 3573.8 5212.08
Radiation dose at JAEA Oarai (P11) 1399.370 5168.3
Onuki Oarai Town 1387.990 3710.96 5212.08
Sawa Hitachinaka City 1353.770 2802.67 5209.34
Toyooka Tokai Village 1321.760 3406.14 5212.08
Ajigaura Hitachinaka City 1313.890 3351.02 5209.34
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3239.3 5201.14
Geiger Counter Feeds from Asao Kawasaki 1266.620 5121.79
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5143.68
Isohama Oarai Town 1250.540 3235.08 5206.61
Ebisawa Ibaraki Town 1222.240 8782.77 5209.34
Muramatsu Tokai Village 1203.520 3436.64 5212.08
Kamitoda Hokota City 1184.740 2819.42 5212.08
Yanagisawa Hitachinaka City 1166.970 2871.22 5209.34
Tokushuku Hokota City 1159.730 2545.1 5212.08
Tasaki Hokota City 1153.300 3007.69 5181.98
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3239.3 5201.14
Kadobe Naka City 1086.580 6839.18 5209.34
Radiation dose at Date city office, Date 1076.050 5146.42
Oshinobe Tokai Village 1041.340 3208.04 5212.08
Oba Mito City 1037.670 10538.5 5212.08
Godai Naka City 1031.270 2781.28 5212.08
Ishikawa Mito City 1030.810 3278.34 5214.82
Isobe Hitachiota City 1013.130 15819.1 5212.08
Yatabe Ibaraki Town 996.127 2750.84 5212.08
Radiation dose at Motomiya city office, Motomiya 992.703 5146.42
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3234.19 5192.93
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3234.19 5192.93
Yokobori Naka City 930.280 3223.26 5212.08
Sugaya Naka City 926.186 4925.12 5214.82
Kounosu Naka City 926.087 2514.6 5212.08
Funaishikawa Tokai Village 900.399 3337.56 5212.08
Nukada Naka City 899.900 3014.35 5206.61
Uridura Naka City 890.113 2877.34 5206.61
Shiraki Tsuruga City 881.330 6106.82 5214.82
Motokomezaki Naka City 880.851 2680.49 5179.25
Shiraki pass Tsuruga City 850.284 6396.52 5214.82
Radiation dose in Yamamoto 846.633 5168.3
Yoshizawa Mito City 837.646 2910.86 5212.08
Radiation dose at JAEA Oarai (P7) 831.135 5168.3
Mayumi Hitachiota City 828.119 2888 5212.08
Urasoko Tsuruga City 826.465 5069.94 5214.82
Nemoto Hitachioomiya City 825.588 3252.05 5209.34
Takenami Mihama Town 804.283 5321.54 5214.82
Radiation dose at JAEA Oarai (P15) 780.207 5168.3
Tateishi Tsuruga City 780.092 4216.09 5214.82
Radiation dose at JAEA Oarai (P14) 770.174 5168.3
Radiation dose at JAEA Oarai (P13) 769.612 5168.3
Ukishima Kawasaki Ward 735.475 9949.32 5214.82
Kume Hitachiota City 713.958 2827 5212.08
Radiation dose at JAEA Oarai (P2) 712.011 5168.3
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3234.19 5192.93
Nyuu Mihama Town 674.787 4848.86 5214.82
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3239.3 5201.14
Radiation dose in Iwanuma 670.242 5168.3
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3239.3 5201.14
Tsuruga Tsuruga City 655.360 4277.06 5214.82
Shiohama Kawasaki Ward 653.536 3415.57 5214.82
Radiation dose in Kakuda 649.863 5168.3
Sakajiri Mihama Town 649.252 5657.02 5214.82
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3552.8 5214.82
Radiation dose in Onagawa (MP-2) 632.968 5165.57
Kumatori town Nishi primary school Station 631.491 4246.55 5214.82
Oshima Kawasaki Ward 630.402 3255.46 5214.82
Izumisano municipal Oike athletic field Station 629.920 4787.89 5214.82
Atom-kyoudou nursery school Station 625.566 4597.27 5214.82
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4185.58 5214.82
Nakamachi Omaezaki City 623.494 5390.15 5214.82
Uraga Yokosuka City 622.492 2554.02 5214.82
Goritoge Shika Town 622.143 5725.64 5214.82
Kumatori town Minami primary school Station 606.134 4871.74 5214.82
Radiation dose at JAEA Oarai (P1) 603.643 5171.04
Yamanotedai-No.1 Park Station 599.140 4543.89 5214.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 5187.46
Noumi Shika Town 594.021 5664.62 5214.82
Radiation dose in Watari 591.851 5168.3
Hairando Yokosuka City 588.667 3202.08 5214.82
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3239.3 5201.14
Ningyotoge Kagamino Town 574.857 4543.89 5214.82
Ten-no Kagamino Town 569.960 5443.54 5214.82
Funagura Yokosuka City 563.909 3019.1 5214.82
Chidori Kawasaki Ward 560.211 2919.98 5214.82
Radiation dose at JAEA Oarai (P16) 556.365 5168.3
Shika Shika Town 551.376 5458.77 5214.82
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3545.16 5214.82
Sahara Yokosuka City 547.404 2828.49 5214.82
Kazanashi Shika Town 545.377 5123.33 5214.82
Akasumi Shika Town 544.970 4688.76 5214.82
Kurahashi Maizuru City 540.820 4269.42 5214.82
Obama Obama City 540.809 3819.62 5214.82
Sakuragaike community hall Omaezaki City 540.772 5527.38 5214.82
Shirowa primary school Omaezaki City 535.692 5413.02 5214.82
Radiation dose at JAEA Oarai (P5) 529.759 5168.3
Uenohara Omaezaki City 529.333 5565.54 5214.82
Kumano Shika Town 529.019 5313.94 5214.82
Izumisano municipal Hineno filtration plant Station 527.471 4582.04 5214.82
Nishi-hamasada Matsue City 525.089 5069.22 5198.4
Kouno Minami-Echizen Town 525.028 3842.5 5214.82
Kurihama Yokosuka City 523.708 3057.21 5214.82
Osaka prefectural Kumatori off-site-center Station 522.808 4223.68 5214.82
Ogasa branch Kikugawa City 522.039 5626.94 5201.14
Izumisano municipal Hineno primary scool Station 518.181 3667.16 5214.82
Shirasuna Omaezaki City 499.479 5451.18 5214.82
Jitougata primary school Makinohara City 498.059 5230.05 5214.82
Kataku Matsue City 497.007 4063.58 5214.82
Nishihemi Yokosuka City 496.917 2439.66 5214.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 5187.46
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4002.6 5214.82
Otomi Takahama Town 494.821 4482.91 5214.82
Otsu Nanao City 493.895 4498.15 5214.82
The Observation point for comparison Tatsunokuchi 493.454 3705.26 5214.82
Hitsuhama Ohi Town 492.630 4170.34 5214.82
Kijiyama Misasa Town 489.284 4231.32 5214.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 5187.46
Hiraba Omaezaki City 485.878 5451.18 5214.82
Tayu Matsue City 484.956 4238.96 5214.82
Hamaokakita primary school Omaezaki City 484.537 5588.94 5201.14
Oitomi Ayabe City 474.670 5374.92 5214.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 5187.46
Kashiwazaki-shigai Kashiwazaki City 470.822 4277.06 5214.82
Mitsu Matsue City 466.897 4055.98 5214.82
Tonomachi Kawasaki Ward 463.967 5138.56 5214.82
Daitou branch Kakegawa City 463.829 5505.31 5201.14
Fukura Shika Town 462.493 5115.69 5214.82
Nagasawa Yokosuka City 462.365 2988.59 5214.82
The athletic field Station of Kinki University 461.661 3377.42 5214.82
Koura Matsue City 461.049 4841.22 5214.82
Sakurasan Ward Omaezaki City 459.434 5275.79 5214.82
Tsuchikawa Nanao City 458.915 4978.46 5214.82
Kumatori Town office Station 457.917 3484.18 5214.82
Shinkango Omaezaki City 449.013 6106.82 5214.82
Ogurui Takahama Town 448.279 3994.96 5214.82
Kusabue Omaezaki City 444.162 5756.1 5214.82
Omaezaki City monitoring center 443.946 5649.38 5214.82
Akawase Kagamino Town 442.246 3484.18 5214.82
Ibaraki 442.139 2557.63 5206.61
Hinode Town Yokosuka City 438.324 2012.74 5214.82
Nishiyama Kashiwazaki City 437.251 6053.44 5214.82
Kariwa Kariwa Village 436.307 4566.76 5214.82
Osaka prefectural Hineno high scool Station 435.745 4071.22 5214.82
Miyagawa Kashiwazaki City 435.245 4505.78 5214.82
Radiation dose in Natori 434.640 5168.3
Kami-koubu Matsue City 433.868 4429.53 5214.82
Shimo-Takamachi Kariwa Village 433.192 4970.86 5214.82
Osaka prefectural Sano supporting school Station 432.398 4437.17 5214.82
Arahama Kashiwazaki City 428.874 4643.02 5214.82
Doai Kashiwazaki City 425.681 4368.55 5214.82
Owashi Matsue City 424.452 4330.45 5214.82
Okayasu Maizuru City 422.568 5100.46 5214.82
Katsuyama Kariwa Village 421.280 4643.02 5214.82
Kita-koubu Matsue City 420.683 4749.74 5214.82
Kichisaka Maizuru City 413.065 6198.31 5214.82
Nagai Ohi Town 410.699 4506.32 5206.61
Shiokumi Maizuru City 407.938 7715.5 5214.82
Miyadome Ohi Town 407.831 3735.78 5214.82
Kariwa Kariwa Village 407.617 4810.76 5214.82
Ueno Satsuma-sendai City 394.248 3491.78 5214.82
Power Station-South 389.191 5085.22 5214.82
Radiation dose at JAEA Oarai (P6) 386.963 5168.3
Power Station- 385.546 4963.22 5214.82
Takae Satsuma-sendai City 379.551 3537.52 5214.82
Hokawaduura Genkai Town 378.015 5386.36 5214.82
Kou Itimatsu Suetsugu 377.929 3888.24 5214.82
Minato Satsuma-sendai City 377.656 3240.18 5214.82
Iwanai Iwanai Town 376.336 5280.66 5212.08
Hattari Kyowa Town 373.047 5135.86 5212.08
Chatsu Tomari Village 371.011 4907.26 5212.08
Oyama Maizuru City 358.223 4467.68 5214.82
Kodaira Satsuma-sendai City 355.545 3278.34 5214.82
Kayanuma Tomari Village 354.809 4366.26 5212.08
Anojiri Obama City 353.215 3659.52 5214.82
Kushi Genkai Town 349.738 7433.4 5214.82
Yamaguchi 348.715 5846.02 5206.61
Sadahongou Matsue City 348.228 4551.53 5214.82
Sakibe Karatsu City 347.801 7044.58 5214.82
Hirao Genkai Town 343.814 7425.76 5214.82
The Meteorological Obsevatory of kyowa Town 343.275 4869.18 5212.08
Minami-Horoni Kyowa Town 335.180 4564.36 5212.08
Kounoura Takahama Town 330.353 3857.73 5214.82
Kyoudomarisaki Karatsu City 328.622 7547.76 5214.82
Horikappu Jinja Tomari Village 328.230 4724.38 5212.08
Hukada-kita Matsue City 327.031 3743.37 5214.82
Radiation dose in KEK, Tsukuba 326.240 5187.46
Herokaruusu Tomari Village 324.242 4899.68 5212.08
Yorita Satsuma-sendai City 323.218 3834.86 5214.82
Kamoenai Kamoenai Village 322.032 4137.66 5212.08
Radiation dose in Onagawa (MP-6) 316.267 5165.57
Imamura Genkai Town 314.749 63965.2 5214.82
Yamanaka Takahama Town 314.185 4978.46 5214.82
Sendai (Miyagi) 312.585 2342.97 5206.61
Radiation dose in Onagawa (MP-1) 300.147 5165.57
Gumisaki Satsuma-sendai City 295.693 3095.36 5214.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 5187.46
Aomori Aomori City 285.372 3147.04 5212.08
Misawa City hall Misawa City 283.728 6103.62 5212.08
Kashu Ikata Town 277.173 3194.44 5214.82
Noheji Town Office Noheji Town 272.004 2697.48 5212.08
Takasimamati 271.103 3400.29 5214.82
Radiation dose in Onagawa (MP-3) 270.563 5165.57
Kucho Ikata Town 269.545 2820.9 5214.82
Radiation dose in Marumori 269.436 5168.3
Kawanagata Ikata Town 266.821 2752.28 5214.82
Tochigi 260.733 3060.02 5206.61
Chikagawa Mutu City 256.719 3512.8 5212.08
Yokohama Town Office Yokohama Town 254.846 4305.32 5212.08
Tokyo 251.877 3608.09 5206.61
Hiranuma Rokkasho Village 251.186 2827 5212.08
Taisei Ikata Town 246.293 2066.12 5214.82
Chitose-daira Rokkasho Village 245.868 3048.02 5212.08
Gifu 243.951 5023.92 5206.61
Fukkoshi Yokohama Town 243.102 2956.58 5212.08
Shimane 240.651 5023.92 5206.61
Sunagomata Higashidoori Village 238.012 4274.82 5212.08
Obuchi Rokkasho Village 237.506 3398.5 5212.08
Tomari Rokkasho Village 230.636 4754.88 5212.08
kanagawa 226.339 3151.37 5206.61
Saitama 219.770 2740.32 5206.61
Ikatagoshi Ikata Town 217.515 2599.77 5214.82
Touhoku Branch office Touhoku Town 215.416 2461.24 5212.08
Radiation dose at Tohoku University 214.824 5168.3
Odanosawa Higashidoori Village 210.287 3406.14 5212.08
Kagawa 205.829 3516.74 5206.61
Oippe Higashidoori Village 205.182 2933.72 5212.08
Oita 200.921 3882.12 5206.61
Touhoku Town office Touhoku Town 200.811 11384.3 5212.08
Kuchogoshi Ikata Town 198.646 2637.92 5214.82
Minatoura Ikata Town 186.776 2371.05 5214.82
Radiation dose in Koyadori, Ojika 184.905 5162.83
Toyama 184.580 6713.78 5206.61
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3239.3 5201.14
Radiation dose in Tukahama, Ojika 183.417 5162.83
Chiba 182.407 2009.57 5206.61
Nara 182.387 3653.76 5206.61
Okayama 181.976 4749.89 5206.61
Yamagata 181.598 3745.1 5206.61
Ehime 180.745 3379.73 5206.61
Ishikawa 180.445 5823.18 5206.61
Niigata 177.483 6987.82 5206.61
Hiroshima 176.816 3151.37 5206.61
Mie 174.867 3603.52 5206.61
Fukui 170.045 4430.18 5206.61
Radiation dose in Terama, Ojika 168.036 5162.83
Yamanashi 164.561 2923.01 5206.61
Nagano 162.242 4448.45 5206.61
Saga 161.421 3927.79 5206.61
Tottori 161.392 3608.09 5206.61
Radiation dose in Enoshima, Ojika 160.091 5162.83
Osaka 159.103 2785.99 5206.61
Ibaraki-city Environment 157.249 5121.79
Aichi 149.345 3379.73 5206.61
Toyonoura Ikata Town 149.214 2721.77 5214.82
Shizuoka 148.639 3493.91 5206.61
Kyoto 144.522 3973.46 5206.61
Kagoshima 144.449 4306.87 5206.61
Tokushima 143.627 3060.02 5206.61
Gunma 143.572 2055.24 5206.61
Hyogo 139.710 3471.07 5206.61
Fukuoka 136.511 3608.09 5206.61
Wakayama 133.857 2557.63 5206.61
Radiation at Tamaki-cho Mie Japan 133.138 5121.79
Akita 132.832 3927.79 5206.61
Shiga 124.919 2785.99 5206.61
Nagasaki 109.459 3151.37 5206.61
Hokkaido 109.189 4795.56 5206.61
Kumamoto 103.568 3060.02 5206.61
Aomori 101.819 4658.54 5206.61
Miyazaki 100.354 3032.62 5206.61
Kochi 95.931 3471.07 5206.61
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3230.78 5187.46
Iwate 90.324 3836.45 5206.61
Environment Feeds from Ohta 83.623 5121.79
Okinawa 82.305 2626.14 5206.61
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