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Accumulated absorbed dose rate - T=13.03.2011 - 21.10.2017(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 6519.89
Fukushima I MP8 570942.000 6519.89
Fukushima I MP6 240668.000 6519.89
Yamada Futaba Town 176983.000 5099.43 6076.66
Fukushima I MP2 140420.000 6519.89
Fukushima I MP5 111325.000 6519.89
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 4104.94 6591.02
Fukushima I MP3 93730.602 6519.89
Fukushima I MP4 86821.500 6519.89
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 4104.94 6591.02
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 4053.82 6508.94
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 4104.94 6591.02
Ono Okuma Town 38610.500 4708.5 6076.66
Shinzan Futaba Town 38332.801 4273.22 6076.66
Fukushima I MP1 31496.801 6519.89
Yonomori Tomioka Town 29815.900 4868.41 6076.66
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 4104.94 6591.02
Tomioka Tomioka Town 25324.500 5241.54 6076.66
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 4104.94 6591.02
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 4104.94 6591.02
Shimo-Kooriyama Tomioka Town 13057.000 5206.04 6076.66
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 4104.94 6591.02
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 4104.94 6591.02
Kami-kooriyama Tomioka Town 11803.900 4086.66 6076.66
Fukushima II MP3 11060.600 6519.89
Fukushima II MP1 10903.000 6519.89
Kooriyama Futaba Town 10352.900 4761.81 6076.66
Fukushima II MP4 9696.330 6519.89
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 4101.53 6585.55
Fukushima II MP5 9382.150 6519.89
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 4104.94 6591.02
Matsudate Naraha Town 8410.890 5561.37 6076.66
Shigeoka Naraha Town 8115.970 6147.71 6076.66
Fukushima II MP2 7875.320 6519.89
Namie Namie Town 7321.210 4486.44 6076.66
Radiation dose at Shirasawa branch office, Motomiya 7287.920 6536.3
Fukushima II MP6 7062.690 6519.89
Fukushima II MP7 6511.580 6517.15
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 4104.94 6591.02
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 4104.94 6591.02
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 4104.94 6591.02
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 4104.94 6591.02
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 4104.94 6591.02
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 4104.94 6591.02
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 4099.82 6582.82
Futatsunuma Hirono Town 3520.340 5330.4 6076.66
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 4104.94 6591.02
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 4104.94 6591.02
Radiation dose at Koriyama joint government building, Koriyama 3232.890 6533.57
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 4104.94 6591.02
Kiyohashi Namie Town 3162.000 3935.59 6076.66
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 4099.82 6582.82
Radiation dose at Agricultural center, Koriyama 3128.960 6533.57
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 4104.94 6591.02
Radiation dose at Koriyama city office, Koriyama 2803.520 6533.57
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 4104.94 6591.02
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 4099.82 6582.82
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 4104.94 6591.02
Yamadaoka Naraha Town 2205.340 4726.31 6076.66
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 6536.3
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 4104.94 6591.02
Kuji Hitachi City 1990.890 10192.5 6601.97
Hitachinaka Hitachinaka City 1951.950 4476.65 6599.23
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 4099.82 6582.82
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 4099.82 6582.82
Momiyama Hokota City 1837.540 5105.93 6601.97
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 4099.82 6582.82
Horiguchi Hitachinaka City 1779.410 4461.07 6604.7
Onuma Hitachi City 1776.950 3801.33 6599.23
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 4104.94 6591.02
Tsukuriya Hokota City 1736.890 4295.16 6601.97
Radiation dose at Big palette Fukushima, Koriyama 1668.540 6533.57
Nemoto Hitachioomiya City 1633.190 4785.43 6599.23
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 4104.94 6591.02
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 4104.94 6591.02
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 6541.78
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 4104.94 6591.02
Radiation dose at JAEA Oarai (P12) 1512.140 6558.19
Radiation dose at Ose administration center, Koriyama 1494.270 6533.57
Araji Hokota City 1437.760 4304.77 6601.97
Ishigami Tokai Village 1431.690 3918.73 6601.97
Mawatari Hitachinaka City 1422.870 4526.81 6601.97
Radiation dose at JAEA Oarai (P11) 1399.370 6558.19
Onuki Oarai Town 1387.990 4700.54 6601.97
Sawa Hitachinaka City 1353.770 3550.44 6599.23
Toyooka Tokai Village 1321.760 4314.44 6601.97
Ajigaura Hitachinaka City 1313.890 4245.1 6599.23
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 4104.94 6591.02
Geiger Counter Feeds from Asao Kawasaki 1266.620 6511.68
Radiation dose at Tamokami elementary school, Koriyama 1256.140 6533.57
Isohama Oarai Town 1250.540 4098.68 6596.5
Ebisawa Ibaraki Town 1222.240 11126.1 6599.23
Muramatsu Tokai Village 1203.520 4353.07 6601.97
Kamitoda Hokota City 1184.740 3571.26 6601.97
Yanagisawa Hitachinaka City 1166.970 3637.28 6599.23
Tokushuku Hokota City 1159.730 3223.79 6601.97
Tasaki Hokota City 1153.300 3814.4 6571.87
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 4104.94 6591.02
Kadobe Naka City 1086.580 8663.92 6599.23
Radiation dose at Date city office, Date 1076.050 6536.3
Oshinobe Tokai Village 1041.340 4063.51 6601.97
Oba Mito City 1037.670 13348.7 6601.97
Godai Naka City 1031.270 3522.96 6601.97
Ishikawa Mito City 1030.810 4152.1 6604.7
Isobe Hitachiota City 1013.130 20037.6 6601.97
Yatabe Ibaraki Town 996.127 3484.39 6601.97
Radiation dose at Motomiya city office, Motomiya 992.703 6536.3
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 4099.82 6582.82
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 4099.82 6582.82
Yokobori Naka City 930.280 4082.8 6601.97
Sugaya Naka City 926.186 6237.8 6604.7
Kounosu Naka City 926.087 3185.16 6601.97
Funaishikawa Tokai Village 900.399 4227.58 6601.97
Nukada Naka City 899.900 3819.02 6596.5
Uridura Naka City 890.113 3645.43 6596.5
Shiraki Tsuruga City 881.330 7734.46 6604.7
Motokomezaki Naka City 880.851 3399.82 6569.14
Shiraki pass Tsuruga City 850.284 8101.36 6604.7
Radiation dose in Yamamoto 846.633 6558.19
Yoshizawa Mito City 837.646 3687.08 6601.97
Radiation dose at JAEA Oarai (P7) 831.135 6558.19
Mayumi Hitachiota City 828.119 3658.13 6601.97
Urasoko Tsuruga City 826.465 6421.22 6604.7
Nemoto Hitachioomiya City 825.588 4119.72 6599.23
Takenami Mihama Town 804.283 6739.87 6604.7
Radiation dose at JAEA Oarai (P15) 780.207 6558.19
Tateishi Tsuruga City 780.092 5339.79 6604.7
Radiation dose at JAEA Oarai (P14) 770.174 6558.19
Radiation dose at JAEA Oarai (P13) 769.612 6558.19
Ukishima Kawasaki Ward 735.475 12601.1 6604.7
Kume Hitachiota City 713.958 3580.87 6601.97
Radiation dose at JAEA Oarai (P2) 712.011 6558.19
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 4099.82 6582.82
Nyuu Mihama Town 674.787 6141.22 6604.7
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 4104.94 6591.02
Radiation dose in Iwanuma 670.242 6558.19
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 4104.94 6591.02
Tsuruga Tsuruga City 655.360 5417.02 6604.7
Shiohama Kawasaki Ward 653.536 4325.91 6604.7
Radiation dose in Kakuda 649.863 6558.19
Sakajiri Mihama Town 649.252 7164.77 6604.7
North point of Kinki University Atomic Energy Research Instirute Station 639.566 4499.72 6604.7
Radiation dose in Onagawa (MP-2) 632.968 6555.46
Kumatori town Nishi primary school Station 631.491 5378.37 6604.7
Oshima Kawasaki Ward 630.402 4123.13 6604.7
Izumisano municipal Oike athletic field Station 629.920 6063.99 6604.7
Atom-kyoudou nursery school Station 625.566 5822.57 6604.7
South point of Kinki University Atomic Energy Research Instirute Station 625.202 5301.14 6604.7
Nakamachi Omaezaki City 623.494 6826.77 6604.7
Uraga Yokosuka City 622.492 3234.74 6604.7
Goritoge Shika Town 622.143 7251.68 6604.7
Kumatori town Minami primary school Station 606.134 6170.18 6604.7
Radiation dose at JAEA Oarai (P1) 603.643 6560.93
Yamanotedai-No.1 Park Station 599.140 5754.96 6604.7
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 6577.34
Noumi Shika Town 594.021 7174.39 6604.7
Radiation dose in Watari 591.851 6558.19
Hairando Yokosuka City 588.667 4055.52 6604.7
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 4104.94 6591.02
Ningyotoge Kagamino Town 574.857 5754.96 6604.7
Ten-no Kagamino Town 569.960 6894.38 6604.7
Funagura Yokosuka City 563.909 3823.78 6604.7
Chidori Kawasaki Ward 560.211 3698.23 6604.7
Radiation dose at JAEA Oarai (P16) 556.365 6558.19
Shika Shika Town 551.376 6913.68 6604.7
Higashiosaka municipal Kamikosaka primary scool Station 550.277 4490.04 6604.7
Sahara Yokosuka City 547.404 3582.36 6604.7
Kazanashi Shika Town 545.377 6488.83 6604.7
Akasumi Shika Town 544.970 5938.44 6604.7
Kurahashi Maizuru City 540.820 5407.34 6604.7
Obama Obama City 540.809 4837.66 6604.7
Sakuragaike community hall Omaezaki City 540.772 7000.58 6604.7
Shirowa primary school Omaezaki City 535.692 6855.74 6604.7
Radiation dose at JAEA Oarai (P5) 529.759 6558.19
Uenohara Omaezaki City 529.333 7048.9 6604.7
Kumano Shika Town 529.019 6730.25 6604.7
Izumisano municipal Hineno filtration plant Station 527.471 5803.28 6604.7
Nishi-hamasada Matsue City 525.089 6424.56 6588.29
Kouno Minami-Echizen Town 525.028 4866.62 6604.7
Kurihama Yokosuka City 523.708 3872.04 6604.7
Osaka prefectural Kumatori off-site-center Station 522.808 5349.4 6604.7
Ogasa branch Kikugawa City 522.039 7130.62 6591.02
Izumisano municipal Hineno primary scool Station 518.181 4644.56 6604.7
Shirasuna Omaezaki City 499.479 6904.06 6604.7
Jitougata primary school Makinohara City 498.059 6624 6604.7
Kataku Matsue City 497.007 5146.63 6604.7
Nishihemi Yokosuka City 496.917 3089.9 6604.7
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 6577.34
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 5069.4 6604.7
Otomi Takahama Town 494.821 5677.73 6604.7
Otsu Nanao City 493.895 5697.02 6604.7
The Observation point for comparison Tatsunokuchi 493.454 4692.82 6604.7
Hitsuhama Ohi Town 492.630 5281.85 6604.7
Kijiyama Misasa Town 489.284 5359.08 6604.7
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 6577.34
Hiraba Omaezaki City 485.878 6904.06 6604.7
Tayu Matsue City 484.956 5368.76 6604.7
Hamaokakita primary school Omaezaki City 484.537 7082.46 6591.02
Oitomi Ayabe City 474.670 6807.48 6604.7
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 6577.34
Kashiwazaki-shigai Kashiwazaki City 470.822 5417.02 6604.7
Mitsu Matsue City 466.897 5137.01 6604.7
Tonomachi Kawasaki Ward 463.967 6508.12 6604.7
Daitou branch Kakegawa City 463.829 6976.48 6591.02
Fukura Shika Town 462.493 6479.16 6604.7
Nagasawa Yokosuka City 462.365 3785.13 6604.7
The athletic field Station of Kinki University 461.661 4277.59 6604.7
Koura Matsue City 461.049 6131.54 6604.7
Sakurasan Ward Omaezaki City 459.434 6681.93 6604.7
Tsuchikawa Nanao City 458.915 6305.35 6604.7
Kumatori Town office Station 457.917 4412.81 6604.7
Shinkango Omaezaki City 449.013 7734.46 6604.7
Ogurui Takahama Town 448.279 5059.72 6604.7
Kusabue Omaezaki City 444.162 7290.26 6604.7
Omaezaki City monitoring center 443.946 7155.1 6604.7
Akawase Kagamino Town 442.246 4412.81 6604.7
Ibaraki 442.139 3240.38 6596.5
Hinode Town Yokosuka City 438.324 2549.18 6604.7
Nishiyama Kashiwazaki City 437.251 7666.84 6604.7
Kariwa Kariwa Village 436.307 5783.92 6604.7
Osaka prefectural Hineno high scool Station 435.745 5156.3 6604.7
Miyagawa Kashiwazaki City 435.245 5706.7 6604.7
Radiation dose in Natori 434.640 6558.19
Kami-koubu Matsue City 433.868 5610.12 6604.7
Shimo-Takamachi Kariwa Village 433.192 6295.73 6604.7
Osaka prefectural Sano supporting school Station 432.398 5619.79 6604.7
Arahama Kashiwazaki City 428.874 5880.5 6604.7
Doai Kashiwazaki City 425.681 5532.89 6604.7
Owashi Matsue City 424.452 5484.63 6604.7
Okayasu Maizuru City 422.568 6459.86 6604.7
Katsuyama Kariwa Village 421.280 5880.5 6604.7
Kita-koubu Matsue City 420.683 6015.67 6604.7
Kichisaka Maizuru City 413.065 7850.33 6604.7
Nagai Ohi Town 410.699 5709.27 6596.5
Shiokumi Maizuru City 407.938 9771.89 6604.7
Miyadome Ohi Town 407.831 4731.46 6604.7
Kariwa Kariwa Village 407.617 6092.96 6604.7
Ueno Satsuma-sendai City 394.248 4422.43 6604.7
Power Station-South 389.191 6440.57 6604.7
Radiation dose at JAEA Oarai (P6) 386.963 6558.19
Power Station- 385.546 6286.06 6604.7
Takae Satsuma-sendai City 379.551 4480.36 6604.7
Hokawaduura Genkai Town 378.015 6821.96 6604.7
Kou Itimatsu Suetsugu 377.929 4924.56 6604.7
Minato Satsuma-sendai City 377.656 4103.78 6604.7
Iwanai Iwanai Town 376.336 6688.84 6601.97
Hattari Kyowa Town 373.047 6505.43 6601.97
Chatsu Tomari Village 371.011 6215.87 6601.97
Oyama Maizuru City 358.223 5658.44 6604.7
Kodaira Satsuma-sendai City 355.545 4152.1 6604.7
Kayanuma Tomari Village 354.809 5530.6 6601.97
Anojiri Obama City 353.215 4634.88 6604.7
Kushi Genkai Town 349.738 9414.6 6604.7
Yamaguchi 348.715 7406.59 6596.5
Sadahongou Matsue City 348.228 5764.63 6604.7
Sakibe Karatsu City 347.801 8922.14 6604.7
Hirao Genkai Town 343.814 9404.92 6604.7
The Meteorological Obsevatory of kyowa Town 343.275 6167.63 6601.97
Minami-Horoni Kyowa Town 335.180 5781.53 6601.97
Kounoura Takahama Town 330.353 4885.92 6604.7
Kyoudomarisaki Karatsu City 328.622 9559.44 6604.7
Horikappu Jinja Tomari Village 328.230 5984.22 6601.97
Hukada-kita Matsue City 327.031 4741.08 6604.7
Radiation dose in KEK, Tsukuba 326.240 6577.34
Herokaruusu Tomari Village 324.242 6206.26 6601.97
Yorita Satsuma-sendai City 323.218 4856.95 6604.7
Kamoenai Kamoenai Village 322.032 5241.04 6601.97
Radiation dose in Onagawa (MP-6) 316.267 6555.46
Imamura Genkai Town 314.749 81013.6 6604.7
Yamanaka Takahama Town 314.185 6305.35 6604.7
Sendai (Miyagi) 312.585 2968.42 6596.5
Radiation dose in Onagawa (MP-1) 300.147 6555.46
Gumisaki Satsuma-sendai City 295.693 3920.36 6604.7
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 6577.34
Aomori Aomori City 285.372 3986.26 6601.97
Misawa City hall Misawa City 283.728 7731.25 6601.97
Kashu Ikata Town 277.173 4045.84 6604.7
Noheji Town Office Noheji Town 272.004 3416.81 6601.97
Takasimamati 271.103 4306.56 6604.7
Radiation dose in Onagawa (MP-3) 270.563 6555.46
Kucho Ikata Town 269.545 3572.74 6604.7
Radiation dose in Marumori 269.436 6558.19
Kawanagata Ikata Town 266.821 3485.84 6604.7
Tochigi 260.733 3876.89 6596.5
Chikagawa Mutu City 256.719 4449.55 6601.97
Yokohama Town Office Yokohama Town 254.846 5453.4 6601.97
Tokyo 251.877 4571.26 6596.5
Hiranuma Rokkasho Village 251.186 3580.87 6601.97
Taisei Ikata Town 246.293 2616.8 6604.7
Chitose-daira Rokkasho Village 245.868 3860.82 6601.97
Gifu 243.951 6365.04 6596.5
Fukkoshi Yokohama Town 243.102 3745 6601.97
Shimane 240.651 6365.04 6596.5
Sunagomata Higashidoori Village 238.012 5414.77 6601.97
Obuchi Rokkasho Village 237.506 4304.77 6601.97
Tomari Rokkasho Village 230.636 6022.85 6601.97
kanagawa 226.339 3992.62 6596.5
Saitama 219.770 3471.84 6596.5
Ikatagoshi Ikata Town 217.515 3292.68 6604.7
Touhoku Branch office Touhoku Town 215.416 3117.58 6601.97
Radiation dose at Tohoku University 214.824 6558.19
Odanosawa Higashidoori Village 210.287 4314.44 6601.97
Kagawa 205.829 4455.53 6596.5
Oippe Higashidoori Village 205.182 3716.04 6601.97
Oita 200.921 4918.44 6596.5
Touhoku Town office Touhoku Town 200.811 14420.1 6601.97
Kuchogoshi Ikata Town 198.646 3341 6604.7
Minatoura Ikata Town 186.776 3003 6604.7
Radiation dose in Koyadori, Ojika 184.905 6552.72
Toyama 184.580 8506.01 6596.5
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 4104.94 6591.02
Radiation dose in Tukahama, Ojika 183.417 6552.72
Chiba 182.407 2546.02 6596.5
Nara 182.387 4629.12 6596.5
Okayama 181.976 6017.86 6596.5
Yamagata 181.598 4744.85 6596.5
Ehime 180.745 4281.94 6596.5
Ishikawa 180.445 7377.66 6596.5
Niigata 177.483 8853.19 6596.5
Hiroshima 176.816 3992.62 6596.5
Mie 174.867 4565.47 6596.5
Fukui 170.045 5612.81 6596.5
Radiation dose in Terama, Ojika 168.036 6552.72
Yamanashi 164.561 3703.3 6596.5
Nagano 162.242 5635.95 6596.5
Saga 161.421 4976.3 6596.5
Tottori 161.392 4571.26 6596.5
Radiation dose in Enoshima, Ojika 160.091 6552.72
Osaka 159.103 3529.7 6596.5
Ibaraki-city Environment 157.249 6511.68
Aichi 149.345 4281.94 6596.5
Toyonoura Ikata Town 149.214 3447.19 6604.7
Shizuoka 148.639 4426.6 6596.5
Kyoto 144.522 5034.17 6596.5
Kagoshima 144.449 5456.58 6596.5
Tokushima 143.627 3876.89 6596.5
Gunma 143.572 2603.88 6596.5
Hyogo 139.710 4397.66 6596.5
Fukuoka 136.511 4571.26 6596.5
Wakayama 133.857 3240.38 6596.5
Radiation at Tamaki-cho Mie Japan 133.138 6511.68
Akita 132.832 4976.3 6596.5
Shiga 124.919 3529.7 6596.5
Nagasaki 109.459 3992.62 6596.5
Hokkaido 109.189 6075.72 6596.5
Kumamoto 103.568 3876.89 6596.5
Aomori 101.819 5902.13 6596.5
Miyazaki 100.354 3842.17 6596.5
Kochi 95.931 4397.66 6596.5
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 4096.42 6577.34
Iwate 90.324 4860.58 6596.5
Environment Feeds from Ohta 83.623 6511.68
Okinawa 82.305 3327.18 6596.5
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