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Accumulated absorbed dose rate - T=13.03.2011 - 23.06.2017(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 6191.57
Fukushima I MP8 570942.000 6191.57
Fukushima I MP6 240668.000 6191.57
Yamada Futaba Town 176983.000 4823.91 5748.34
Fukushima I MP2 140420.000 6191.57
Fukushima I MP5 111325.000 6191.57
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3900.46 6262.7
Fukushima I MP3 93730.602 6191.57
Fukushima I MP4 86821.500 6191.57
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3900.46 6262.7
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3849.34 6180.62
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3900.46 6262.7
Ono Okuma Town 38610.500 4454.1 5748.34
Shinzan Futaba Town 38332.801 4042.34 5748.34
Fukushima I MP1 31496.801 6191.57
Yonomori Tomioka Town 29815.900 4605.38 5748.34
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3900.46 6262.7
Tomioka Tomioka Town 25324.500 4958.34 5748.34
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3900.46 6262.7
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3900.46 6262.7
Shimo-Kooriyama Tomioka Town 13057.000 4924.76 5748.34
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3900.46 6262.7
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3900.46 6262.7
Kami-kooriyama Tomioka Town 11803.900 3865.86 5748.34
Fukushima II MP3 11060.600 6191.57
Fukushima II MP1 10903.000 6191.57
Kooriyama Futaba Town 10352.900 4504.53 5748.34
Fukushima II MP4 9696.330 6191.57
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3897.05 6257.23
Fukushima II MP5 9382.150 6191.57
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3900.46 6262.7
Matsudate Naraha Town 8410.890 5260.89 5748.34
Shigeoka Naraha Town 8115.970 5815.55 5748.34
Fukushima II MP2 7875.320 6191.57
Namie Namie Town 7321.210 4244.04 5748.34
Radiation dose at Shirasawa branch office, Motomiya 7287.920 6207.98
Fukushima II MP6 7062.690 6191.57
Fukushima II MP7 6511.580 6188.83
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3900.46 6262.7
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3900.46 6262.7
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3900.46 6262.7
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3900.46 6262.7
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3900.46 6262.7
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3900.46 6262.7
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3895.34 6254.5
Futatsunuma Hirono Town 3520.340 5042.4 5748.34
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3900.46 6262.7
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3900.46 6262.7
Radiation dose at Koriyama joint government building, Koriyama 3232.890 6205.25
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3900.46 6262.7
Kiyohashi Namie Town 3162.000 3722.96 5748.34
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3895.34 6254.5
Radiation dose at Agricultural center, Koriyama 3128.960 6205.25
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3900.46 6262.7
Radiation dose at Koriyama city office, Koriyama 2803.520 6205.25
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3900.46 6262.7
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3895.34 6254.5
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3900.46 6262.7
Yamadaoka Naraha Town 2205.340 4470.94 5748.34
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 6207.98
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3900.46 6262.7
Kuji Hitachi City 1990.890 9685.63 6273.65
Hitachinaka Hitachinaka City 1951.950 4253.93 6270.91
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3895.34 6254.5
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3895.34 6254.5
Momiyama Hokota City 1837.540 4852.01 6273.65
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3895.34 6254.5
Horiguchi Hitachinaka City 1779.410 4239.31 6276.38
Onuma Hitachi City 1776.950 3612.21 6270.91
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3900.46 6262.7
Tsukuriya Hokota City 1736.890 4081.56 6273.65
Radiation dose at Big palette Fukushima, Koriyama 1668.540 6205.25
Nemoto Hitachioomiya City 1633.190 4547.35 6270.91
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3900.46 6262.7
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3900.46 6262.7
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 6213.46
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3900.46 6262.7
Radiation dose at JAEA Oarai (P12) 1512.140 6229.87
Radiation dose at Ose administration center, Koriyama 1494.270 6205.25
Araji Hokota City 1437.760 4090.69 6273.65
Ishigami Tokai Village 1431.690 3723.85 6273.65
Mawatari Hitachinaka City 1422.870 4301.69 6273.65
Radiation dose at JAEA Oarai (P11) 1399.370 6229.87
Onuki Oarai Town 1387.990 4466.78 6273.65
Sawa Hitachinaka City 1353.770 3373.81 6270.91
Toyooka Tokai Village 1321.760 4099.88 6273.65
Ajigaura Hitachinaka City 1313.890 4033.9 6270.91
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3900.46 6262.7
Geiger Counter Feeds from Asao Kawasaki 1266.620 6183.36
Radiation dose at Tamokami elementary school, Koriyama 1256.140 6205.25
Isohama Oarai Town 1250.540 3894.68 6268.18
Ebisawa Ibaraki Town 1222.240 10572.5 6270.91
Muramatsu Tokai Village 1203.520 4136.59 6273.65
Kamitoda Hokota City 1184.740 3393.66 6273.65
Yanagisawa Hitachinaka City 1166.970 3456.32 6270.91
Tokushuku Hokota City 1159.730 3063.47 6273.65
Tasaki Hokota City 1153.300 3623.83 6243.55
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3900.46 6262.7
Kadobe Naka City 1086.580 8232.88 6270.91
Radiation dose at Date city office, Date 1076.050 6207.98
Oshinobe Tokai Village 1041.340 3861.43 6273.65
Oba Mito City 1037.670 12684.9 6273.65
Godai Naka City 1031.270 3347.76 6273.65
Ishikawa Mito City 1030.810 3945.7 6276.38
Isobe Hitachiota City 1013.130 19041.1 6273.65
Yatabe Ibaraki Town 996.127 3311.11 6273.65
Radiation dose at Motomiya city office, Motomiya 992.703 6207.98
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3895.34 6254.5
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3895.34 6254.5
Yokobori Naka City 930.280 3879.76 6273.65
Sugaya Naka City 926.186 5927.71 6276.38
Kounosu Naka City 926.087 3026.76 6273.65
Funaishikawa Tokai Village 900.399 4017.34 6273.65
Nukada Naka City 899.900 3628.94 6268.18
Uridura Naka City 890.113 3463.99 6268.18
Shiraki Tsuruga City 881.330 7349.98 6276.38
Motokomezaki Naka City 880.851 3229.9 6240.82
Shiraki pass Tsuruga City 850.284 7698.65 6276.38
Radiation dose in Yamamoto 846.633 6229.87
Yoshizawa Mito City 837.646 3503.72 6273.65
Radiation dose at JAEA Oarai (P7) 831.135 6229.87
Mayumi Hitachiota City 828.119 3476.21 6273.65
Urasoko Tsuruga City 826.465 6102.02 6276.38
Nemoto Hitachioomiya City 825.588 3914.75 6270.91
Takenami Mihama Town 804.283 6404.83 6276.38
Radiation dose at JAEA Oarai (P15) 780.207 6229.87
Tateishi Tsuruga City 780.092 5074.35 6276.38
Radiation dose at JAEA Oarai (P14) 770.174 6229.87
Radiation dose at JAEA Oarai (P13) 769.612 6229.87
Ukishima Kawasaki Ward 735.475 11974.7 6276.38
Kume Hitachiota City 713.958 3402.79 6273.65
Radiation dose at JAEA Oarai (P2) 712.011 6229.87
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3895.34 6254.5
Nyuu Mihama Town 674.787 5835.94 6276.38
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3900.46 6262.7
Radiation dose in Iwanuma 670.242 6229.87
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3900.46 6262.7
Tsuruga Tsuruga City 655.360 5147.74 6276.38
Shiohama Kawasaki Ward 653.536 4110.87 6276.38
Radiation dose in Kakuda 649.863 6229.87
Sakajiri Mihama Town 649.252 6808.61 6276.38
North point of Kinki University Atomic Energy Research Instirute Station 639.566 4276.03 6276.38
Radiation dose in Onagawa (MP-2) 632.968 6227.14
Kumatori town Nishi primary school Station 631.491 5111.01 6276.38
Oshima Kawasaki Ward 630.402 3918.17 6276.38
Izumisano municipal Oike athletic field Station 629.920 5762.55 6276.38
Atom-kyoudou nursery school Station 625.566 5533.13 6276.38
South point of Kinki University Atomic Energy Research Instirute Station 625.202 5037.62 6276.38
Nakamachi Omaezaki City 623.494 6487.41 6276.38
Uraga Yokosuka City 622.492 3073.94 6276.38
Goritoge Shika Town 622.143 6891.19 6276.38
Kumatori town Minami primary school Station 606.134 5863.46 6276.38
Radiation dose at JAEA Oarai (P1) 603.643 6232.61
Yamanotedai-No.1 Park Station 599.140 5468.88 6276.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 6249.02
Noumi Shika Town 594.021 6817.75 6276.38
Radiation dose in Watari 591.851 6229.87
Hairando Yokosuka City 588.667 3853.92 6276.38
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3900.46 6262.7
Ningyotoge Kagamino Town 574.857 5468.88 6276.38
Ten-no Kagamino Town 569.960 6551.66 6276.38
Funagura Yokosuka City 563.909 3633.7 6276.38
Chidori Kawasaki Ward 560.211 3514.39 6276.38
Radiation dose at JAEA Oarai (P16) 556.365 6229.87
Shika Shika Town 551.376 6570 6276.38
Higashiosaka municipal Kamikosaka primary scool Station 550.277 4266.84 6276.38
Sahara Yokosuka City 547.404 3404.28 6276.38
Kazanashi Shika Town 545.377 6166.27 6276.38
Akasumi Shika Town 544.970 5643.24 6276.38
Kurahashi Maizuru City 540.820 5138.54 6276.38
Obama Obama City 540.809 4597.18 6276.38
Sakuragaike community hall Omaezaki City 540.772 6652.58 6276.38
Shirowa primary school Omaezaki City 535.692 6514.94 6276.38
Radiation dose at JAEA Oarai (P5) 529.759 6229.87
Uenohara Omaezaki City 529.333 6698.5 6276.38
Kumano Shika Town 529.019 6395.69 6276.38
Izumisano municipal Hineno filtration plant Station 527.471 5514.79 6276.38
Nishi-hamasada Matsue City 525.089 6104.4 6259.97
Kouno Minami-Echizen Town 525.028 4624.7 6276.38
Kurihama Yokosuka City 523.708 3679.56 6276.38
Osaka prefectural Kumatori off-site-center Station 522.808 5083.49 6276.38
Ogasa branch Kikugawa City 522.039 6775.42 6262.7
Izumisano municipal Hineno primary scool Station 518.181 4413.67 6276.38
Shirasuna Omaezaki City 499.479 6560.86 6276.38
Jitougata primary school Makinohara City 498.059 6294.72 6276.38
Kataku Matsue City 497.007 4890.79 6276.38
Nishihemi Yokosuka City 496.917 2936.3 6276.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 6249.02
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4817.4 6276.38
Otomi Takahama Town 494.821 5395.49 6276.38
Otsu Nanao City 493.895 5413.82 6276.38
The Observation point for comparison Tatsunokuchi 493.454 4459.54 6276.38
Hitsuhama Ohi Town 492.630 5019.29 6276.38
Kijiyama Misasa Town 489.284 5092.68 6276.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 6249.02
Hiraba Omaezaki City 485.878 6560.86 6276.38
Tayu Matsue City 484.956 5101.87 6276.38
Hamaokakita primary school Omaezaki City 484.537 6729.66 6262.7
Oitomi Ayabe City 474.670 6469.08 6276.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 6249.02
Kashiwazaki-shigai Kashiwazaki City 470.822 5147.74 6276.38
Mitsu Matsue City 466.897 4881.65 6276.38
Tonomachi Kawasaki Ward 463.967 6184.61 6276.38
Daitou branch Kakegawa City 463.829 6628.96 6262.7
Fukura Shika Town 462.493 6157.08 6276.38
Nagasawa Yokosuka City 462.365 3596.97 6276.38
The athletic field Station of Kinki University 461.661 4064.95 6276.38
Koura Matsue City 461.049 5826.74 6276.38
Sakurasan Ward Omaezaki City 459.434 6349.77 6276.38
Tsuchikawa Nanao City 458.915 5991.91 6276.38
Kumatori Town office Station 457.917 4193.45 6276.38
Shinkango Omaezaki City 449.013 7349.98 6276.38
Ogurui Takahama Town 448.279 4808.21 6276.38
Kusabue Omaezaki City 444.162 6927.86 6276.38
Omaezaki City monitoring center 443.946 6799.42 6276.38
Akawase Kagamino Town 442.246 4193.45 6276.38
Ibaraki 442.139 3079.1 6268.18
Hinode Town Yokosuka City 438.324 2422.46 6276.38
Nishiyama Kashiwazaki City 437.251 7285.73 6276.38
Kariwa Kariwa Village 436.307 5496.41 6276.38
Osaka prefectural Hineno high scool Station 435.745 4899.98 6276.38
Miyagawa Kashiwazaki City 435.245 5423.02 6276.38
Radiation dose in Natori 434.640 6229.87
Kami-koubu Matsue City 433.868 5331.24 6276.38
Shimo-Takamachi Kariwa Village 433.192 5982.77 6276.38
Osaka prefectural Sano supporting school Station 432.398 5340.43 6276.38
Arahama Kashiwazaki City 428.874 5588.18 6276.38
Doai Kashiwazaki City 425.681 5257.85 6276.38
Owashi Matsue City 424.452 5211.99 6276.38
Okayasu Maizuru City 422.568 6138.74 6276.38
Katsuyama Kariwa Village 421.280 5588.18 6276.38
Kita-koubu Matsue City 420.683 5716.63 6276.38
Kichisaka Maizuru City 413.065 7460.09 6276.38
Nagai Ohi Town 410.699 5425.11 6268.18
Shiokumi Maizuru City 407.938 9286.13 6276.38
Miyadome Ohi Town 407.831 4496.26 6276.38
Kariwa Kariwa Village 407.617 5790.07 6276.38
Ueno Satsuma-sendai City 394.248 4202.59 6276.38
Power Station-South 389.191 6120.41 6276.38
Radiation dose at JAEA Oarai (P6) 386.963 6229.87
Power Station- 385.546 5973.58 6276.38
Takae Satsuma-sendai City 379.551 4257.65 6276.38
Hokawaduura Genkai Town 378.015 6482.84 6276.38
Kou Itimatsu Suetsugu 377.929 4679.76 6276.38
Minato Satsuma-sendai City 377.656 3899.78 6276.38
Iwanai Iwanai Town 376.336 6356.2 6273.65
Hattari Kyowa Town 373.047 6181.91 6273.65
Chatsu Tomari Village 371.011 5906.75 6273.65
Oyama Maizuru City 358.223 5377.15 6276.38
Kodaira Satsuma-sendai City 355.545 3945.7 6276.38
Kayanuma Tomari Village 354.809 5255.56 6273.65
Anojiri Obama City 353.215 4404.48 6276.38
Kushi Genkai Town 349.738 8946.6 6276.38
Yamaguchi 348.715 7037.95 6268.18
Sadahongou Matsue City 348.228 5478.07 6276.38
Sakibe Karatsu City 347.801 8478.62 6276.38
Hirao Genkai Town 343.814 8937.41 6276.38
The Meteorological Obsevatory of kyowa Town 343.275 5860.91 6273.65
Minami-Horoni Kyowa Town 335.180 5494.01 6273.65
Kounoura Takahama Town 330.353 4643.04 6276.38
Kyoudomarisaki Karatsu City 328.622 9084.24 6276.38
Horikappu Jinja Tomari Village 328.230 5686.62 6273.65
Hukada-kita Matsue City 327.031 4505.4 6276.38
Radiation dose in KEK, Tsukuba 326.240 6249.02
Herokaruusu Tomari Village 324.242 5897.61 6273.65
Yorita Satsuma-sendai City 323.218 4615.51 6276.38
Kamoenai Kamoenai Village 322.032 4980.4 6273.65
Radiation dose in Onagawa (MP-6) 316.267 6227.14
Imamura Genkai Town 314.749 76986.5 6276.38
Yamanaka Takahama Town 314.185 5991.91 6276.38
Sendai (Miyagi) 312.585 2820.68 6268.18
Radiation dose in Onagawa (MP-1) 300.147 6227.14
Gumisaki Satsuma-sendai City 295.693 3725.47 6276.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 6249.02
Aomori Aomori City 285.372 3788.02 6273.65
Misawa City hall Misawa City 283.728 7346.77 6273.65
Kashu Ikata Town 277.173 3844.73 6276.38
Noheji Town Office Noheji Town 272.004 3246.89 6273.65
Takasimamati 271.103 4092.48 6276.38
Radiation dose in Onagawa (MP-3) 270.563 6227.14
Kucho Ikata Town 269.545 3395.14 6276.38
Radiation dose in Marumori 269.436 6229.87
Kawanagata Ikata Town 266.821 3312.55 6276.38
Tochigi 260.733 3683.93 6268.18
Chikagawa Mutu City 256.719 4228.27 6273.65
Yokohama Town Office Yokohama Town 254.846 5182.2 6273.65
Tokyo 251.877 4343.74 6268.18
Hiranuma Rokkasho Village 251.186 3402.79 6273.65
Taisei Ikata Town 246.293 2486.71 6276.38
Chitose-daira Rokkasho Village 245.868 3668.82 6273.65
Gifu 243.951 6048.24 6268.18
Fukkoshi Yokohama Town 243.102 3558.75 6273.65
Shimane 240.651 6048.24 6268.18
Sunagomata Higashidoori Village 238.012 5145.49 6273.65
Obuchi Rokkasho Village 237.506 4090.69 6273.65
Tomari Rokkasho Village 230.636 5723.33 6273.65
kanagawa 226.339 3793.9 6268.18
Saitama 219.770 3299.04 6268.18
Ikatagoshi Ikata Town 217.515 3129 6276.38
Touhoku Branch office Touhoku Town 215.416 2962.54 6273.65
Radiation dose at Tohoku University 214.824 6229.87
Odanosawa Higashidoori Village 210.287 4099.88 6273.65
Kagawa 205.829 4233.77 6268.18
Oippe Higashidoori Village 205.182 3531.24 6273.65
Oita 200.921 4673.64 6268.18
Touhoku Town office Touhoku Town 200.811 13703 6273.65
Kuchogoshi Ikata Town 198.646 3174.91 6276.38
Minatoura Ikata Town 186.776 2853.72 6276.38
Radiation dose in Koyadori, Ojika 184.905 6224.4
Toyama 184.580 8082.65 6268.18
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3900.46 6262.7
Radiation dose in Tukahama, Ojika 183.417 6224.4
Chiba 182.407 2419.3 6268.18
Nara 182.387 4398.72 6268.18
Okayama 181.976 5718.34 6268.18
Yamagata 181.598 4508.69 6268.18
Ehime 180.745 4068.82 6268.18
Ishikawa 180.445 7010.46 6268.18
Niigata 177.483 8412.55 6268.18
Hiroshima 176.816 3793.9 6268.18
Mie 174.867 4338.24 6268.18
Fukui 170.045 5333.45 6268.18
Radiation dose in Terama, Ojika 168.036 6224.4
Yamanashi 164.561 3518.98 6268.18
Nagano 162.242 5355.44 6268.18
Saga 161.421 4728.62 6268.18
Tottori 161.392 4343.74 6268.18
Radiation dose in Enoshima, Ojika 160.091 6224.4
Osaka 159.103 3354.02 6268.18
Ibaraki-city Environment 157.249 6183.36
Aichi 149.345 4068.82 6268.18
Toyonoura Ikata Town 149.214 3275.83 6276.38
Shizuoka 148.639 4206.28 6268.18
Kyoto 144.522 4783.61 6268.18
Kagoshima 144.449 5184.99 6268.18
Tokushima 143.627 3683.93 6268.18
Gunma 143.572 2474.28 6268.18
Hyogo 139.710 4178.78 6268.18
Fukuoka 136.511 4343.74 6268.18
Wakayama 133.857 3079.1 6268.18
Radiation at Tamaki-cho Mie Japan 133.138 6183.36
Akita 132.832 4728.62 6268.18
Shiga 124.919 3354.02 6268.18
Nagasaki 109.459 3793.9 6268.18
Hokkaido 109.189 5773.32 6268.18
Kumamoto 103.568 3683.93 6268.18
Aomori 101.819 5608.37 6268.18
Miyazaki 100.354 3650.94 6268.18
Kochi 95.931 4178.78 6268.18
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3891.94 6249.02
Iwate 90.324 4618.66 6268.18
Environment Feeds from Ohta 83.623 6183.36
Okinawa 82.305 3161.58 6268.18
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