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Accumulated absorbed dose rate - T=13.03.2011 - 08.12.2016(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 5652.58
Fukushima I MP8 570942.000 5652.58
Fukushima I MP6 240668.000 5652.58
Yamada Futaba Town 176983.000 4371.6 5209.34
Fukushima I MP2 140420.000 5652.58
Fukushima I MP5 111325.000 5652.58
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3564.77 5723.71
Fukushima I MP3 93730.602 5652.58
Fukushima I MP4 86821.500 5652.58
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3564.77 5723.71
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3513.65 5641.63
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3564.77 5723.71
Ono Okuma Town 38610.500 4036.46 5209.34
Shinzan Futaba Town 38332.801 3663.31 5209.34
Fukushima I MP1 31496.801 5652.58
Yonomori Tomioka Town 29815.900 4173.55 5209.34
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3564.77 5723.71
Tomioka Tomioka Town 25324.500 4493.42 5209.34
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3564.77 5723.71
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3564.77 5723.71
Shimo-Kooriyama Tomioka Town 13057.000 4462.99 5209.34
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3564.77 5723.71
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3564.77 5723.71
Kami-kooriyama Tomioka Town 11803.900 3503.38 5209.34
Fukushima II MP3 11060.600 5652.58
Fukushima II MP1 10903.000 5652.58
Kooriyama Futaba Town 10352.900 4082.16 5209.34
Fukushima II MP4 9696.330 5652.58
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3561.36 5718.24
Fukushima II MP5 9382.150 5652.58
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3564.77 5723.71
Matsudate Naraha Town 8410.890 4767.6 5209.34
Shigeoka Naraha Town 8115.970 5270.26 5209.34
Fukushima II MP2 7875.320 5652.58
Namie Namie Town 7321.210 3846.1 5209.34
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5668.99
Fukushima II MP6 7062.690 5652.58
Fukushima II MP7 6511.580 5649.84
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3564.77 5723.71
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3564.77 5723.71
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3564.77 5723.71
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3564.77 5723.71
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3564.77 5723.71
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3564.77 5723.71
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3559.66 5715.5
Futatsunuma Hirono Town 3520.340 4569.6 5209.34
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3564.77 5723.71
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3564.77 5723.71
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5666.26
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3564.77 5723.71
Kiyohashi Namie Town 3162.000 3373.87 5209.34
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3559.66 5715.5
Radiation dose at Agricultural center, Koriyama 3128.960 5666.26
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3564.77 5723.71
Radiation dose at Koriyama city office, Koriyama 2803.520 5666.26
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3564.77 5723.71
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3559.66 5715.5
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3564.77 5723.71
Yamadaoka Naraha Town 2205.340 4051.73 5209.34
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5668.99
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3564.77 5723.71
Kuji Hitachi City 1990.890 8853.5 5734.66
Hitachinaka Hitachinaka City 1951.950 3888.3 5731.92
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3559.66 5715.5
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3559.66 5715.5
Momiyama Hokota City 1837.540 4435.15 5734.66
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3559.66 5715.5
Horiguchi Hitachinaka City 1779.410 3875.26 5737.39
Onuma Hitachi City 1776.950 3301.74 5731.92
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3564.77 5723.71
Tsukuriya Hokota City 1736.890 3730.9 5734.66
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5666.26
Nemoto Hitachioomiya City 1633.190 4156.5 5731.92
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3564.77 5723.71
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3564.77 5723.71
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5674.46
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3564.77 5723.71
Radiation dose at JAEA Oarai (P12) 1512.140 5690.88
Radiation dose at Ose administration center, Koriyama 1494.270 5666.26
Araji Hokota City 1437.760 3739.25 5734.66
Ishigami Tokai Village 1431.690 3403.92 5734.66
Mawatari Hitachinaka City 1422.870 3932.11 5734.66
Radiation dose at JAEA Oarai (P11) 1399.370 5690.88
Onuki Oarai Town 1387.990 4083.02 5734.66
Sawa Hitachinaka City 1353.770 3083.82 5731.92
Toyooka Tokai Village 1321.760 3747.65 5734.66
Ajigaura Hitachinaka City 1313.890 3687.18 5731.92
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3564.77 5723.71
Geiger Counter Feeds from Asao Kawasaki 1266.620 5644.37
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5666.26
Isohama Oarai Town 1250.540 3559.78 5729.18
Ebisawa Ibaraki Town 1222.240 9663.82 5731.92
Muramatsu Tokai Village 1203.520 3781.2 5734.66
Kamitoda Hokota City 1184.740 3102.1 5734.66
Yanagisawa Hitachinaka City 1166.970 3159.24 5731.92
Tokushuku Hokota City 1159.730 2800.27 5734.66
Tasaki Hokota City 1153.300 3311 5704.56
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3564.77 5723.71
Kadobe Naka City 1086.580 7525.26 5731.92
Radiation dose at Date city office, Date 1076.050 5668.99
Oshinobe Tokai Village 1041.340 3529.68 5734.66
Oba Mito City 1037.670 11595.1 5734.66
Godai Naka City 1031.270 3060.14 5734.66
Ishikawa Mito City 1030.810 3606.86 5737.39
Isobe Hitachiota City 1013.130 17405.2 5734.66
Yatabe Ibaraki Town 996.127 3026.64 5734.66
Radiation dose at Motomiya city office, Motomiya 992.703 5668.99
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3559.66 5715.5
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3559.66 5715.5
Yokobori Naka City 930.280 3546.43 5734.66
Sugaya Naka City 926.186 5418.66 5737.39
Kounosu Naka City 926.087 2766.72 5734.66
Funaishikawa Tokai Village 900.399 3672.19 5734.66
Nukada Naka City 899.900 3316.9 5729.18
Uridura Naka City 890.113 3166.13 5729.18
Shiraki Tsuruga City 881.330 6718.79 5737.39
Motokomezaki Naka City 880.851 2950.94 5701.82
Shiraki pass Tsuruga City 850.284 7037.52 5737.39
Radiation dose in Yamamoto 846.633 5690.88
Yoshizawa Mito City 837.646 3202.7 5734.66
Radiation dose at JAEA Oarai (P7) 831.135 5690.88
Mayumi Hitachiota City 828.119 3177.55 5734.66
Urasoko Tsuruga City 826.465 5578 5737.39
Nemoto Hitachioomiya City 825.588 3578.28 5731.92
Takenami Mihama Town 804.283 5854.81 5737.39
Radiation dose at JAEA Oarai (P15) 780.207 5690.88
Tateishi Tsuruga City 780.092 4638.58 5737.39
Radiation dose at JAEA Oarai (P14) 770.174 5690.88
Radiation dose at JAEA Oarai (P13) 769.612 5690.88
Ukishima Kawasaki Ward 735.475 10946.3 5737.39
Kume Hitachiota City 713.958 3110.45 5734.66
Radiation dose at JAEA Oarai (P2) 712.011 5690.88
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3559.66 5715.5
Nyuu Mihama Town 674.787 5334.77 5737.39
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3564.77 5723.71
Radiation dose in Iwanuma 670.242 5690.88
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3564.77 5723.71
Tsuruga Tsuruga City 655.360 4705.67 5737.39
Shiohama Kawasaki Ward 653.536 3757.84 5737.39
Radiation dose in Kakuda 649.863 5690.88
Sakajiri Mihama Town 649.252 6223.91 5737.39
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3908.82 5737.39
Radiation dose in Onagawa (MP-2) 632.968 5688.14
Kumatori town Nishi primary school Station 631.491 4672.1 5737.39
Oshima Kawasaki Ward 630.402 3581.69 5737.39
Izumisano municipal Oike athletic field Station 629.920 5267.68 5737.39
Atom-kyoudou nursery school Station 625.566 5057.96 5737.39
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4605.01 5737.39
Nakamachi Omaezaki City 623.494 5930.3 5737.39
Uraga Yokosuka City 622.492 2809.96 5737.39
Goritoge Shika Town 622.143 6299.4 5737.39
Kumatori town Minami primary school Station 606.134 5359.93 5737.39
Radiation dose at JAEA Oarai (P1) 603.643 5693.62
Yamanotedai-No.1 Park Station 599.140 4999.23 5737.39
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 5710.03
Noumi Shika Town 594.021 6232.27 5737.39
Radiation dose in Watari 591.851 5690.88
Hairando Yokosuka City 588.667 3522.96 5737.39
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3564.77 5723.71
Ningyotoge Kagamino Town 574.857 4999.23 5737.39
Ten-no Kagamino Town 569.960 5989.03 5737.39
Funagura Yokosuka City 563.909 3321.65 5737.39
Chidori Kawasaki Ward 560.211 3212.59 5737.39
Radiation dose at JAEA Oarai (P16) 556.365 5690.88
Shika Shika Town 551.376 6005.79 5737.39
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3900.42 5737.39
Sahara Yokosuka City 547.404 3111.93 5737.39
Kazanashi Shika Town 545.377 5636.74 5737.39
Akasumi Shika Town 544.970 5158.62 5737.39
Kurahashi Maizuru City 540.820 4697.26 5737.39
Obama Obama City 540.809 4202.39 5737.39
Sakuragaike community hall Omaezaki City 540.772 6081.28 5737.39
Shirowa primary school Omaezaki City 535.692 5955.46 5737.39
Radiation dose at JAEA Oarai (P5) 529.759 5690.88
Uenohara Omaezaki City 529.333 6123.26 5737.39
Kumano Shika Town 529.019 5846.45 5737.39
Izumisano municipal Hineno filtration plant Station 527.471 5041.2 5737.39
Nishi-hamasada Matsue City 525.089 5578.8 5720.98
Kouno Minami-Echizen Town 525.028 4227.55 5737.39
Kurihama Yokosuka City 523.708 3363.57 5737.39
Osaka prefectural Kumatori off-site-center Station 522.808 4646.94 5737.39
Ogasa branch Kikugawa City 522.039 6192.3 5723.71
Izumisano municipal Hineno primary scool Station 518.181 4034.65 5737.39
Shirasuna Omaezaki City 499.479 5997.44 5737.39
Jitougata primary school Makinohara City 498.059 5754.15 5737.39
Kataku Matsue City 497.007 4470.79 5737.39
Nishihemi Yokosuka City 496.917 2684.14 5737.39
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 5710.03
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4403.7 5737.39
Otomi Takahama Town 494.821 4932.14 5737.39
Otsu Nanao City 493.895 4948.9 5737.39
The Observation point for comparison Tatsunokuchi 493.454 4076.57 5737.39
Hitsuhama Ohi Town 492.630 4588.25 5737.39
Kijiyama Misasa Town 489.284 4655.34 5737.39
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 5710.03
Hiraba Omaezaki City 485.878 5997.44 5737.39
Tayu Matsue City 484.956 4663.74 5737.39
Hamaokakita primary school Omaezaki City 484.537 6150.48 5723.71
Oitomi Ayabe City 474.670 5913.54 5737.39
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 5710.03
Kashiwazaki-shigai Kashiwazaki City 470.822 4705.67 5737.39
Mitsu Matsue City 466.897 4462.43 5737.39
Tonomachi Kawasaki Ward 463.967 5653.5 5737.39
Daitou branch Kakegawa City 463.829 6058.45 5723.71
Fukura Shika Town 462.493 5628.33 5737.39
Nagasawa Yokosuka City 462.365 3288.08 5737.39
The athletic field Station of Kinki University 461.661 3715.87 5737.39
Koura Matsue City 461.049 5326.36 5737.39
Sakurasan Ward Omaezaki City 459.434 5804.48 5737.39
Tsuchikawa Nanao City 458.915 5477.35 5737.39
Kumatori Town office Station 457.917 3833.33 5737.39
Shinkango Omaezaki City 449.013 6718.79 5737.39
Ogurui Takahama Town 448.279 4395.3 5737.39
Kusabue Omaezaki City 444.162 6332.92 5737.39
Omaezaki City monitoring center 443.946 6215.51 5737.39
Akawase Kagamino Town 442.246 3833.33 5737.39
Ibaraki 442.139 2814.34 5729.18
Hinode Town Yokosuka City 438.324 2214.43 5737.39
Nishiyama Kashiwazaki City 437.251 6660.06 5737.39
Kariwa Kariwa Village 436.307 5024.4 5737.39
Osaka prefectural Hineno high scool Station 435.745 4479.19 5737.39
Miyagawa Kashiwazaki City 435.245 4957.31 5737.39
Radiation dose in Natori 434.640 5690.88
Kami-koubu Matsue City 433.868 4873.41 5737.39
Shimo-Takamachi Kariwa Village 433.192 5468.99 5737.39
Osaka prefectural Sano supporting school Station 432.398 4881.82 5737.39
Arahama Kashiwazaki City 428.874 5108.29 5737.39
Doai Kashiwazaki City 425.681 4806.32 5737.39
Owashi Matsue City 424.452 4764.4 5737.39
Okayasu Maizuru City 422.568 5611.57 5737.39
Katsuyama Kariwa Village 421.280 5108.29 5737.39
Kita-koubu Matsue City 420.683 5225.71 5737.39
Kichisaka Maizuru City 413.065 6819.44 5737.39
Nagai Ohi Town 410.699 4958.61 5729.18
Shiokumi Maizuru City 407.938 8488.67 5737.39
Miyadome Ohi Town 407.831 4110.14 5737.39
Kariwa Kariwa Village 407.617 5292.84 5737.39
Ueno Satsuma-sendai City 394.248 3841.69 5737.39
Power Station-South 389.191 5594.81 5737.39
Radiation dose at JAEA Oarai (P6) 386.963 5690.88
Power Station- 385.546 5460.59 5737.39
Takae Satsuma-sendai City 379.551 3892.02 5737.39
Hokawaduura Genkai Town 378.015 5926.12 5737.39
Kou Itimatsu Suetsugu 377.929 4277.88 5737.39
Minato Satsuma-sendai City 377.656 3564.88 5737.39
Iwanai Iwanai Town 376.336 5810.11 5734.66
Hattari Kyowa Town 373.047 5650.8 5734.66
Chatsu Tomari Village 371.011 5399.28 5734.66
Oyama Maizuru City 358.223 4915.38 5737.39
Kodaira Satsuma-sendai City 355.545 3606.86 5737.39
Kayanuma Tomari Village 354.809 4804.03 5734.66
Anojiri Obama City 353.215 4026.24 5737.39
Kushi Genkai Town 349.738 8178.3 5737.39
Yamaguchi 348.715 6432.77 5729.18
Sadahongou Matsue City 348.228 5007.64 5737.39
Sakibe Karatsu City 347.801 7750.51 5737.39
Hirao Genkai Town 343.814 8169.9 5737.39
The Meteorological Obsevatory of kyowa Town 343.275 5357.38 5734.66
Minami-Horoni Kyowa Town 335.180 5022 5734.66
Kounoura Takahama Town 330.353 4244.31 5737.39
Kyoudomarisaki Karatsu City 328.622 8304.12 5737.39
Horikappu Jinja Tomari Village 328.230 5198.06 5734.66
Hukada-kita Matsue City 327.031 4118.49 5737.39
Radiation dose in KEK, Tsukuba 326.240 5710.03
Herokaruusu Tomari Village 324.242 5390.93 5734.66
Yorita Satsuma-sendai City 323.218 4219.15 5737.39
Kamoenai Kamoenai Village 322.032 4552.51 5734.66
Radiation dose in Onagawa (MP-6) 316.267 5688.14
Imamura Genkai Town 314.749 70375.1 5737.39
Yamanaka Takahama Town 314.185 5477.35 5737.39
Sendai (Miyagi) 312.585 2578.13 5729.18
Radiation dose in Onagawa (MP-1) 300.147 5688.14
Gumisaki Satsuma-sendai City 295.693 3405.54 5737.39
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 5710.03
Aomori Aomori City 285.372 3462.58 5734.66
Misawa City hall Misawa City 283.728 6715.58 5734.66
Kashu Ikata Town 277.173 3514.56 5737.39
Noheji Town Office Noheji Town 272.004 2967.94 5734.66
Takasimamati 271.103 3741.03 5737.39
Radiation dose in Onagawa (MP-3) 270.563 5688.14
Kucho Ikata Town 269.545 3103.58 5737.39
Radiation dose in Marumori 269.436 5690.88
Kawanagata Ikata Town 266.821 3028.08 5737.39
Tochigi 260.733 3367.15 5729.18
Chikagawa Mutu City 256.719 3865.01 5734.66
Yokohama Town Office Yokohama Town 254.846 4736.98 5734.66
Tokyo 251.877 3970.22 5729.18
Hiranuma Rokkasho Village 251.186 3110.45 5734.66
Taisei Ikata Town 246.293 2273.16 5737.39
Chitose-daira Rokkasho Village 245.868 3353.62 5734.66
Gifu 243.951 5528.16 5729.18
Fukkoshi Yokohama Town 243.102 3253.01 5734.66
Shimane 240.651 5528.16 5729.18
Sunagomata Higashidoori Village 238.012 4703.42 5734.66
Obuchi Rokkasho Village 237.506 3739.25 5734.66
Tomari Rokkasho Village 230.636 5231.62 5734.66
kanagawa 226.339 3467.66 5729.18
Saitama 219.770 3015.36 5729.18
Ikatagoshi Ikata Town 217.515 2860.29 5737.39
Touhoku Branch office Touhoku Town 215.416 2708.02 5734.66
Radiation dose at Tohoku University 214.824 5690.88
Odanosawa Higashidoori Village 210.287 3747.65 5734.66
Kagawa 205.829 3869.71 5729.18
Oippe Higashidoori Village 205.182 3227.86 5734.66
Oita 200.921 4271.76 5729.18
Touhoku Town office Touhoku Town 200.811 12525.7 5734.66
Kuchogoshi Ikata Town 198.646 2902.26 5737.39
Minatoura Ikata Town 186.776 2608.65 5737.39
Radiation dose in Koyadori, Ojika 184.905 5685.41
Toyama 184.580 7387.63 5729.18
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3564.77 5723.71
Radiation dose in Tukahama, Ojika 183.417 5685.41
Chiba 182.407 2211.26 5729.18
Nara 182.387 4020.48 5729.18
Okayama 181.976 5226.62 5729.18
Yamagata 181.598 4120.99 5729.18
Ehime 180.745 3718.94 5729.18
Ishikawa 180.445 6407.64 5729.18
Niigata 177.483 7689.17 5729.18
Hiroshima 176.816 3467.66 5729.18
Mie 174.867 3965.2 5729.18
Fukui 170.045 4874.83 5729.18
Radiation dose in Terama, Ojika 168.036 5685.41
Yamanashi 164.561 3216.38 5729.18
Nagano 162.242 4894.93 5729.18
Saga 161.421 4322.02 5729.18
Tottori 161.392 3970.22 5729.18
Radiation dose in Enoshima, Ojika 160.091 5685.41
Osaka 159.103 3065.62 5729.18
Ibaraki-city Environment 157.249 5644.37
Aichi 149.345 3718.94 5729.18
Toyonoura Ikata Town 149.214 2994.52 5737.39
Shizuoka 148.639 3844.58 5729.18
Kyoto 144.522 4372.27 5729.18
Kagoshima 144.449 4739.14 5729.18
Tokushima 143.627 3367.15 5729.18
Gunma 143.572 2261.52 5729.18
Hyogo 139.710 3819.46 5729.18
Fukuoka 136.511 3970.22 5729.18
Wakayama 133.857 2814.34 5729.18
Radiation at Tamaki-cho Mie Japan 133.138 5644.37
Akita 132.832 4322.02 5729.18
Shiga 124.919 3065.62 5729.18
Nagasaki 109.459 3467.66 5729.18
Hokkaido 109.189 5276.88 5729.18
Kumamoto 103.568 3367.15 5729.18
Aomori 101.819 5126.11 5729.18
Miyazaki 100.354 3337 5729.18
Kochi 95.931 3819.46 5729.18
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3556.25 5710.03
Iwate 90.324 4221.5 5729.18
Environment Feeds from Ohta 83.623 5644.37
Okinawa 82.305 2889.72 5729.18
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