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Accumulated absorbed dose rate - T=13.03.2011 - 01.10.2016(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 5466.53
Fukushima I MP8 570942.000 5466.53
Fukushima I MP6 240668.000 5466.53
Yamada Futaba Town 176983.000 4215.47 5023.3
Fukushima I MP2 140420.000 5466.53
Fukushima I MP5 111325.000 5466.53
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3448.9 5537.66
Fukushima I MP3 93730.602 5466.53
Fukushima I MP4 86821.500 5466.53
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3448.9 5537.66
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3397.78 5455.58
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3448.9 5537.66
Ono Okuma Town 38610.500 3892.31 5023.3
Shinzan Futaba Town 38332.801 3532.48 5023.3
Fukushima I MP1 31496.801 5466.53
Yonomori Tomioka Town 29815.900 4024.5 5023.3
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3448.9 5537.66
Tomioka Tomioka Town 25324.500 4332.95 5023.3
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3448.9 5537.66
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3448.9 5537.66
Shimo-Kooriyama Tomioka Town 13057.000 4303.6 5023.3
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3448.9 5537.66
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3448.9 5537.66
Kami-kooriyama Tomioka Town 11803.900 3378.25 5023.3
Fukushima II MP3 11060.600 5466.53
Fukushima II MP1 10903.000 5466.53
Kooriyama Futaba Town 10352.900 3936.37 5023.3
Fukushima II MP4 9696.330 5466.53
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3445.49 5532.19
Fukushima II MP5 9382.150 5466.53
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3448.9 5537.66
Matsudate Naraha Town 8410.890 4597.33 5023.3
Shigeoka Naraha Town 8115.970 5082.03 5023.3
Fukushima II MP2 7875.320 5466.53
Namie Namie Town 7321.210 3708.73 5023.3
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5482.94
Fukushima II MP6 7062.690 5466.53
Fukushima II MP7 6511.580 5463.79
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3448.9 5537.66
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3448.9 5537.66
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3448.9 5537.66
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3448.9 5537.66
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3448.9 5537.66
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3448.9 5537.66
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3443.78 5529.46
Futatsunuma Hirono Town 3520.340 4406.4 5023.3
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3448.9 5537.66
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3448.9 5537.66
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5480.21
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3448.9 5537.66
Kiyohashi Namie Town 3162.000 3253.38 5023.3
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3443.78 5529.46
Radiation dose at Agricultural center, Koriyama 3128.960 5480.21
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3448.9 5537.66
Radiation dose at Koriyama city office, Koriyama 2803.520 5480.21
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3448.9 5537.66
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3443.78 5529.46
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3448.9 5537.66
Yamadaoka Naraha Town 2205.340 3907.02 5023.3
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5482.94
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3448.9 5537.66
Kuji Hitachi City 1990.890 8566.27 5548.61
Hitachinaka Hitachinaka City 1951.950 3762.1 5545.87
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3443.78 5529.46
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3443.78 5529.46
Momiyama Hokota City 1837.540 4291.26 5548.61
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3443.78 5529.46
Horiguchi Hitachinaka City 1779.410 3749.59 5551.34
Onuma Hitachi City 1776.950 3194.57 5545.87
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3448.9 5537.66
Tsukuriya Hokota City 1736.890 3609.86 5548.61
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5480.21
Nemoto Hitachioomiya City 1633.190 4021.58 5545.87
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3448.9 5537.66
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3448.9 5537.66
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5488.42
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3448.9 5537.66
Radiation dose at JAEA Oarai (P12) 1512.140 5504.83
Radiation dose at Ose administration center, Koriyama 1494.270 5480.21
Araji Hokota City 1437.760 3617.94 5548.61
Ishigami Tokai Village 1431.690 3293.49 5548.61
Mawatari Hitachinaka City 1422.870 3804.54 5548.61
Radiation dose at JAEA Oarai (P11) 1399.370 5504.83
Onuki Oarai Town 1387.990 3950.56 5548.61
Sawa Hitachinaka City 1353.770 2983.73 5545.87
Toyooka Tokai Village 1321.760 3626.06 5548.61
Ajigaura Hitachinaka City 1313.890 3567.5 5545.87
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3448.9 5537.66
Geiger Counter Feeds from Asao Kawasaki 1266.620 5458.32
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5480.21
Isohama Oarai Town 1250.540 3444.18 5543.14
Ebisawa Ibaraki Town 1222.240 9350.15 5545.87
Muramatsu Tokai Village 1203.520 3658.53 5548.61
Kamitoda Hokota City 1184.740 3001.46 5548.61
Yanagisawa Hitachinaka City 1166.970 3056.7 5545.87
Tokushuku Hokota City 1159.730 2709.42 5548.61
Tasaki Hokota City 1153.300 3203.01 5518.51
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3448.9 5537.66
Kadobe Naka City 1086.580 7281 5545.87
Radiation dose at Date city office, Date 1076.050 5482.94
Oshinobe Tokai Village 1041.340 3415.17 5548.61
Oba Mito City 1037.670 11218.9 5548.61
Godai Naka City 1031.270 2960.86 5548.61
Ishikawa Mito City 1030.810 3489.9 5551.34
Isobe Hitachiota City 1013.130 16840.5 5548.61
Yatabe Ibaraki Town 996.127 2928.45 5548.61
Radiation dose at Motomiya city office, Motomiya 992.703 5482.94
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3443.78 5529.46
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3443.78 5529.46
Yokobori Naka City 930.280 3431.38 5548.61
Sugaya Naka City 926.186 5242.95 5551.34
Kounosu Naka City 926.087 2676.96 5548.61
Funaishikawa Tokai Village 900.399 3553.06 5548.61
Nukada Naka City 899.900 3209.18 5543.14
Uridura Naka City 890.113 3063.31 5543.14
Shiraki Tsuruga City 881.330 6500.92 5551.34
Motokomezaki Naka City 880.851 2854.66 5515.78
Shiraki pass Tsuruga City 850.284 6809.31 5551.34
Radiation dose in Yamamoto 846.633 5504.83
Yoshizawa Mito City 837.646 3098.8 5548.61
Radiation dose at JAEA Oarai (P7) 831.135 5504.83
Mayumi Hitachiota City 828.119 3074.46 5548.61
Urasoko Tsuruga City 826.465 5397.12 5551.34
Nemoto Hitachioomiya City 825.588 3462.13 5545.87
Takenami Mihama Town 804.283 5664.95 5551.34
Radiation dose at JAEA Oarai (P15) 780.207 5504.83
Tateishi Tsuruga City 780.092 4488.16 5551.34
Radiation dose at JAEA Oarai (P14) 770.174 5504.83
Radiation dose at JAEA Oarai (P13) 769.612 5504.83
Ukishima Kawasaki Ward 735.475 10591.4 5551.34
Kume Hitachiota City 713.958 3009.54 5548.61
Radiation dose at JAEA Oarai (P2) 712.011 5504.83
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3443.78 5529.46
Nyuu Mihama Town 674.787 5161.78 5551.34
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3448.9 5537.66
Radiation dose in Iwanuma 670.242 5504.83
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3448.9 5537.66
Tsuruga Tsuruga City 655.360 4553.08 5551.34
Shiohama Kawasaki Ward 653.536 3635.98 5551.34
Radiation dose in Kakuda 649.863 5504.83
Sakajiri Mihama Town 649.252 6022.09 5551.34
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3782.07 5551.34
Radiation dose in Onagawa (MP-2) 632.968 5502.1
Kumatori town Nishi primary school Station 631.491 4520.6 5551.34
Oshima Kawasaki Ward 630.402 3465.55 5551.34
Izumisano municipal Oike athletic field Station 629.920 5096.86 5551.34
Atom-kyoudou nursery school Station 625.566 4893.95 5551.34
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4455.68 5551.34
Nakamachi Omaezaki City 623.494 5738 5551.34
Uraga Yokosuka City 622.492 2718.84 5551.34
Goritoge Shika Town 622.143 6095.13 5551.34
Kumatori town Minami primary school Station 606.134 5186.12 5551.34
Radiation dose at JAEA Oarai (P1) 603.643 5507.57
Yamanotedai-No.1 Park Station 599.140 4837.12 5551.34
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 5523.98
Noumi Shika Town 594.021 6030.17 5551.34
Radiation dose in Watari 591.851 5504.83
Hairando Yokosuka City 588.667 3408.72 5551.34
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3448.9 5537.66
Ningyotoge Kagamino Town 574.857 4837.12 5551.34
Ten-no Kagamino Town 569.960 5794.82 5551.34
Funagura Yokosuka City 563.909 3213.94 5551.34
Chidori Kawasaki Ward 560.211 3108.41 5551.34
Radiation dose at JAEA Oarai (P16) 556.365 5504.83
Shika Shika Town 551.376 5811.04 5551.34
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3773.94 5551.34
Sahara Yokosuka City 547.404 3011.02 5551.34
Kazanashi Shika Town 545.377 5453.95 5551.34
Akasumi Shika Town 544.970 4991.34 5551.34
Kurahashi Maizuru City 540.820 4544.94 5551.34
Obama Obama City 540.809 4066.12 5551.34
Sakuragaike community hall Omaezaki City 540.772 5884.08 5551.34
Shirowa primary school Omaezaki City 535.692 5762.34 5551.34
Radiation dose at JAEA Oarai (P5) 529.759 5504.83
Uenohara Omaezaki City 529.333 5924.7 5551.34
Kumano Shika Town 529.019 5656.87 5551.34
Izumisano municipal Hineno filtration plant Station 527.471 4877.73 5551.34
Nishi-hamasada Matsue City 525.089 5397.38 5534.93
Kouno Minami-Echizen Town 525.028 4090.46 5551.34
Kurihama Yokosuka City 523.708 3254.5 5551.34
Osaka prefectural Kumatori off-site-center Station 522.808 4496.25 5551.34
Ogasa branch Kikugawa City 522.039 5991.02 5537.66
Izumisano municipal Hineno primary scool Station 518.181 3903.81 5551.34
Shirasuna Omaezaki City 499.479 5802.96 5551.34
Jitougata primary school Makinohara City 498.059 5567.56 5551.34
Kataku Matsue City 497.007 4325.81 5551.34
Nishihemi Yokosuka City 496.917 2597.1 5551.34
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 5523.98
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4260.9 5551.34
Otomi Takahama Town 494.821 4772.21 5551.34
Otsu Nanao City 493.895 4788.42 5551.34
The Observation point for comparison Tatsunokuchi 493.454 3944.38 5551.34
Hitsuhama Ohi Town 492.630 4439.47 5551.34
Kijiyama Misasa Town 489.284 4504.38 5551.34
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 5523.98
Hiraba Omaezaki City 485.878 5802.96 5551.34
Tayu Matsue City 484.956 4512.51 5551.34
Hamaokakita primary school Omaezaki City 484.537 5950.56 5537.66
Oitomi Ayabe City 474.670 5721.78 5551.34
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 5523.98
Kashiwazaki-shigai Kashiwazaki City 470.822 4553.08 5551.34
Mitsu Matsue City 466.897 4317.73 5551.34
Tonomachi Kawasaki Ward 463.967 5470.17 5551.34
Daitou branch Kakegawa City 463.829 5861.52 5537.66
Fukura Shika Town 462.493 5445.82 5551.34
Nagasawa Yokosuka City 462.365 3181.46 5551.34
The athletic field Station of Kinki University 461.661 3595.37 5551.34
Koura Matsue City 461.049 5153.64 5551.34
Sakurasan Ward Omaezaki City 459.434 5616.26 5551.34
Tsuchikawa Nanao City 458.915 5299.73 5551.34
Kumatori Town office Station 457.917 3709.03 5551.34
Shinkango Omaezaki City 449.013 6500.92 5551.34
Ogurui Takahama Town 448.279 4252.77 5551.34
Kusabue Omaezaki City 444.162 6127.56 5551.34
Omaezaki City monitoring center 443.946 6013.96 5551.34
Akawase Kagamino Town 442.246 3709.03 5551.34
Ibaraki 442.139 2722.94 5543.14
Hinode Town Yokosuka City 438.324 2142.62 5551.34
Nishiyama Kashiwazaki City 437.251 6444.09 5551.34
Kariwa Kariwa Village 436.307 4861.47 5551.34
Osaka prefectural Hineno high scool Station 435.745 4333.94 5551.34
Miyagawa Kashiwazaki City 435.245 4796.56 5551.34
Radiation dose in Natori 434.640 5504.83
Kami-koubu Matsue City 433.868 4715.38 5551.34
Shimo-Takamachi Kariwa Village 433.192 5291.65 5551.34
Osaka prefectural Sano supporting school Station 432.398 4723.51 5551.34
Arahama Kashiwazaki City 428.874 4942.64 5551.34
Doai Kashiwazaki City 425.681 4650.47 5551.34
Owashi Matsue City 424.452 4609.9 5551.34
Okayasu Maizuru City 422.568 5429.6 5551.34
Katsuyama Kariwa Village 421.280 4942.64 5551.34
Kita-koubu Matsue City 420.683 5056.25 5551.34
Kichisaka Maizuru City 413.065 6598.31 5551.34
Nagai Ohi Town 410.699 4797.58 5543.14
Shiokumi Maizuru City 407.938 8213.41 5551.34
Miyadome Ohi Town 407.831 3976.86 5551.34
Kariwa Kariwa Village 407.617 5121.21 5551.34
Ueno Satsuma-sendai City 394.248 3717.11 5551.34
Power Station-South 389.191 5413.39 5551.34
Radiation dose at JAEA Oarai (P6) 386.963 5504.83
Power Station- 385.546 5283.52 5551.34
Takae Satsuma-sendai City 379.551 3765.81 5551.34
Hokawaduura Genkai Town 378.015 5733.95 5551.34
Kou Itimatsu Suetsugu 377.929 4139.16 5551.34
Minato Satsuma-sendai City 377.656 3449.28 5551.34
Iwanai Iwanai Town 376.336 5621.62 5548.61
Hattari Kyowa Town 373.047 5467.47 5548.61
Chatsu Tomari Village 371.011 5224.11 5548.61
Oyama Maizuru City 358.223 4755.99 5551.34
Kodaira Satsuma-sendai City 355.545 3489.9 5551.34
Kayanuma Tomari Village 354.809 4648.18 5548.61
Anojiri Obama City 353.215 3895.68 5551.34
Kushi Genkai Town 349.738 7913.1 5551.34
Yamaguchi 348.715 6223.87 5543.14
Sadahongou Matsue City 348.228 4845.25 5551.34
Sakibe Karatsu City 347.801 7499.18 5551.34
Hirao Genkai Town 343.814 7904.97 5551.34
The Meteorological Obsevatory of kyowa Town 343.275 5183.57 5548.61
Minami-Horoni Kyowa Town 335.180 4859.07 5548.61
Kounoura Takahama Town 330.353 4106.68 5551.34
Kyoudomarisaki Karatsu City 328.622 8034.84 5551.34
Horikappu Jinja Tomari Village 328.230 5029.42 5548.61
Hukada-kita Matsue City 327.031 3984.94 5551.34
Radiation dose in KEK, Tsukuba 326.240 5523.98
Herokaruusu Tomari Village 324.242 5216.03 5548.61
Yorita Satsuma-sendai City 323.218 4082.33 5551.34
Kamoenai Kamoenai Village 322.032 4404.82 5548.61
Radiation dose in Onagawa (MP-6) 316.267 5502.1
Imamura Genkai Town 314.749 68093.1 5551.34
Yamanaka Takahama Town 314.185 5299.73 5551.34
Sendai (Miyagi) 312.585 2494.41 5543.14
Radiation dose in Onagawa (MP-1) 300.147 5502.1
Gumisaki Satsuma-sendai City 295.693 3295.11 5551.34
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 5523.98
Aomori Aomori City 285.372 3350.24 5548.61
Misawa City hall Misawa City 283.728 6497.71 5548.61
Kashu Ikata Town 277.173 3400.59 5551.34
Noheji Town Office Noheji Town 272.004 2871.65 5548.61
Takasimamati 271.103 3619.72 5551.34
Radiation dose in Onagawa (MP-3) 270.563 5502.1
Kucho Ikata Town 269.545 3002.94 5551.34
Radiation dose in Marumori 269.436 5504.83
Kawanagata Ikata Town 266.821 2929.89 5551.34
Tochigi 260.733 3257.81 5543.14
Chikagawa Mutu City 256.719 3739.62 5548.61
Yokohama Town Office Yokohama Town 254.846 4583.3 5548.61
Tokyo 251.877 3841.3 5543.14
Hiranuma Rokkasho Village 251.186 3009.54 5548.61
Taisei Ikata Town 246.293 2199.45 5551.34
Chitose-daira Rokkasho Village 245.868 3244.82 5548.61
Gifu 243.951 5348.64 5543.14
Fukkoshi Yokohama Town 243.102 3147.47 5548.61
Shimane 240.651 5348.64 5543.14
Sunagomata Higashidoori Village 238.012 4550.83 5548.61
Obuchi Rokkasho Village 237.506 3617.94 5548.61
Tomari Rokkasho Village 230.636 5061.89 5548.61
kanagawa 226.339 3355.06 5543.14
Saitama 219.770 2917.44 5543.14
Ikatagoshi Ikata Town 217.515 2767.54 5551.34
Touhoku Branch office Touhoku Town 215.416 2620.16 5548.61
Radiation dose at Tohoku University 214.824 5504.83
Odanosawa Higashidoori Village 210.287 3626.06 5548.61
Kagawa 205.829 3744.05 5543.14
Oippe Higashidoori Village 205.182 3123.14 5548.61
Oita 200.921 4133.04 5543.14
Touhoku Town office Touhoku Town 200.811 12119.3 5548.61
Kuchogoshi Ikata Town 198.646 2808.15 5551.34
Minatoura Ikata Town 186.776 2524.06 5551.34
Radiation dose in Koyadori, Ojika 184.905 5499.36
Toyama 184.580 7147.73 5543.14
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3448.9 5537.66
Radiation dose in Tukahama, Ojika 183.417 5499.36
Chiba 182.407 2139.46 5543.14
Nara 182.387 3889.92 5543.14
Okayama 181.976 5056.9 5543.14
Yamagata 181.598 3987.17 5543.14
Ehime 180.745 3598.18 5543.14
Ishikawa 180.445 6199.56 5543.14
Niigata 177.483 7439.47 5543.14
Hiroshima 176.816 3355.06 5543.14
Mie 174.867 3836.43 5543.14
Fukui 170.045 4716.53 5543.14
Radiation dose in Terama, Ojika 168.036 5499.36
Yamanashi 164.561 3111.94 5543.14
Nagano 162.242 4735.98 5543.14
Saga 161.421 4181.66 5543.14
Tottori 161.392 3841.3 5543.14
Radiation dose in Enoshima, Ojika 160.091 5499.36
Osaka 159.103 2966.06 5543.14
Ibaraki-city Environment 157.249 5458.32
Aichi 149.345 3598.18 5543.14
Toyonoura Ikata Town 149.214 2897.41 5551.34
Shizuoka 148.639 3719.74 5543.14
Kyoto 144.522 4230.29 5543.14
Kagoshima 144.449 4585.24 5543.14
Tokushima 143.627 3257.81 5543.14
Gunma 143.572 2188.08 5543.14
Hyogo 139.710 3695.42 5543.14
Fukuoka 136.511 3841.3 5543.14
Wakayama 133.857 2722.94 5543.14
Radiation at Tamaki-cho Mie Japan 133.138 5458.32
Akita 132.832 4181.66 5543.14
Shiga 124.919 2966.06 5543.14
Nagasaki 109.459 3355.06 5543.14
Hokkaido 109.189 5105.52 5543.14
Kumamoto 103.568 3257.81 5543.14
Aomori 101.819 4959.65 5543.14
Miyazaki 100.354 3228.63 5543.14
Kochi 95.931 3695.42 5543.14
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3440.38 5523.98
Iwate 90.324 4084.42 5543.14
Environment Feeds from Ohta 83.623 5458.32
Okinawa 82.305 2795.88 5543.14
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