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Accumulated absorbed dose rate - T=13.03.2011 - 06.07.2015(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 4227.12
Fukushima I MP8 570942.000 4227.12
Fukushima I MP6 240668.000 4227.12
Yamada Futaba Town 176983.000 3175.38 3783.89
Fukushima I MP2 140420.000 4227.12
Fukushima I MP5 111325.000 4227.12
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2676.98 4298.26
Fukushima I MP3 93730.602 4227.12
Fukushima I MP4 86821.500 4227.12
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2676.98 4298.26
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2625.86 4216.18
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2676.98 4298.26
Ono Okuma Town 38610.500 2931.95 3783.89
Shinzan Futaba Town 38332.801 2660.9 3783.89
Fukushima I MP1 31496.801 4227.12
Yonomori Tomioka Town 29815.900 3031.52 3783.89
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2676.98 4298.26
Tomioka Tomioka Town 25324.500 3263.87 3783.89
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2676.98 4298.26
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2676.98 4298.26
Shimo-Kooriyama Tomioka Town 13057.000 3241.76 3783.89
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2676.98 4298.26
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2676.98 4298.26
Kami-kooriyama Tomioka Town 11803.900 2544.73 3783.89
Fukushima II MP3 11060.600 4227.12
Fukushima II MP1 10903.000 4227.12
Kooriyama Futaba Town 10352.900 2965.14 3783.89
Fukushima II MP4 9696.330 4227.12
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2673.58 4292.78
Fukushima II MP5 9382.150 4227.12
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2676.98 4298.26
Matsudate Naraha Town 8410.890 3463.02 3783.89
Shigeoka Naraha Town 8115.970 3828.13 3783.89
Fukushima II MP2 7875.320 4227.12
Namie Namie Town 7321.210 2793.67 3783.89
Radiation dose at Shirasawa branch office, Motomiya 7287.920 4243.54
Fukushima II MP6 7062.690 4227.12
Fukushima II MP7 6511.580 4224.38
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2676.98 4298.26
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2676.98 4298.26
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2676.98 4298.26
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2676.98 4298.26
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2676.98 4298.26
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2676.98 4298.26
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2671.87 4290.05
Futatsunuma Hirono Town 3520.340 3319.2 3783.89
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2676.98 4298.26
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2676.98 4298.26
Radiation dose at Koriyama joint government building, Koriyama 3232.890 4240.8
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2676.98 4298.26
Kiyohashi Namie Town 3162.000 2450.67 3783.89
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2671.87 4290.05
Radiation dose at Agricultural center, Koriyama 3128.960 4240.8
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2676.98 4298.26
Radiation dose at Koriyama city office, Koriyama 2803.520 4240.8
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2676.98 4298.26
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2671.87 4290.05
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2676.98 4298.26
Yamadaoka Naraha Town 2205.340 2943.03 3783.89
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 4243.54
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2676.98 4298.26
Kuji Hitachi City 1990.890 6652.8 4309.2
Hitachinaka Hitachinaka City 1951.950 2921.33 4306.46
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2671.87 4290.05
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2671.87 4290.05
Momiyama Hokota City 1837.540 3332.71 4309.2
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2671.87 4290.05
Horiguchi Hitachinaka City 1779.410 2912.45 4311.94
Onuma Hitachi City 1776.950 2480.64 4306.46
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2676.98 4298.26
Tsukuriya Hokota City 1736.890 2803.51 4309.2
Radiation dose at Big palette Fukushima, Koriyama 1668.540 4240.8
Nemoto Hitachioomiya City 1633.190 3122.83 4306.46
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2676.98 4298.26
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2676.98 4298.26
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 4249.01
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2676.98 4298.26
Radiation dose at JAEA Oarai (P12) 1512.140 4265.42
Radiation dose at Ose administration center, Koriyama 1494.270 4240.8
Araji Hokota City 1437.760 2809.79 4309.2
Ishigami Tokai Village 1431.690 2557.81 4309.2
Mawatari Hitachinaka City 1422.870 2954.71 4309.2
Radiation dose at JAEA Oarai (P11) 1399.370 4265.42
Onuki Oarai Town 1387.990 3068.11 4309.2
Sawa Hitachinaka City 1353.770 2316.92 4306.46
Toyooka Tokai Village 1321.760 2816.1 4309.2
Ajigaura Hitachinaka City 1313.890 2770.23 4306.46
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2676.98 4298.26
Geiger Counter Feeds from Asao Kawasaki 1266.620 4218.91
Radiation dose at Tamokami elementary school, Koriyama 1256.140 4240.8
Isohama Oarai Town 1250.540 2674.09 4303.73
Ebisawa Ibaraki Town 1222.240 7260.55 4306.46
Muramatsu Tokai Village 1203.520 2841.31 4309.2
Kamitoda Hokota City 1184.740 2331.01 4309.2
Yanagisawa Hitachinaka City 1166.970 2373.58 4306.46
Tokushuku Hokota City 1159.730 2104.21 4309.2
Tasaki Hokota City 1153.300 2483.64 4279.1
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2676.98 4298.26
Kadobe Naka City 1086.580 5653.82 4306.46
Radiation dose at Date city office, Date 1076.050 4243.54
Oshinobe Tokai Village 1041.340 2652.31 4309.2
Oba Mito City 1037.670 8712.9 4309.2
Godai Naka City 1031.270 2299.49 4309.2
Ishikawa Mito City 1030.810 2710.73 4311.94
Isobe Hitachiota City 1013.130 13078.8 4309.2
Yatabe Ibaraki Town 996.127 2274.31 4309.2
Radiation dose at Motomiya city office, Motomiya 992.703 4243.54
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2671.87 4290.05
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2671.87 4290.05
Yokobori Naka City 930.280 2664.9 4309.2
Sugaya Naka City 926.186 4072.4 4311.94
Kounosu Naka City 926.087 2079 4309.2
Funaishikawa Tokai Village 900.399 2759.4 4309.2
Nukada Naka City 899.900 2491.63 4303.73
Uridura Naka City 890.113 2378.38 4303.73
Shiraki Tsuruga City 881.330 5049.5 4311.94
Motokomezaki Naka City 880.851 2213.21 4276.37
Shiraki pass Tsuruga City 850.284 5289.04 4311.94
Radiation dose in Yamamoto 846.633 4265.42
Yoshizawa Mito City 837.646 2406.61 4309.2
Radiation dose at JAEA Oarai (P7) 831.135 4265.42
Mayumi Hitachiota City 828.119 2387.71 4309.2
Urasoko Tsuruga City 826.465 4192.15 4311.94
Nemoto Hitachioomiya City 825.588 2688.4 4306.46
Takenami Mihama Town 804.283 4400.18 4311.94
Radiation dose at JAEA Oarai (P15) 780.207 4265.42
Tateishi Tsuruga City 780.092 3486.12 4311.94
Radiation dose at JAEA Oarai (P14) 770.174 4265.42
Radiation dose at JAEA Oarai (P13) 769.612 4265.42
Ukishima Kawasaki Ward 735.475 8226.72 4311.94
Kume Hitachiota City 713.958 2337.29 4309.2
Radiation dose at JAEA Oarai (P2) 712.011 4265.42
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2671.87 4290.05
Nyuu Mihama Town 674.787 4009.34 4311.94
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2676.98 4298.26
Radiation dose in Iwanuma 670.242 4265.42
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2676.98 4298.26
Tsuruga Tsuruga City 655.360 3536.54 4311.94
Shiohama Kawasaki Ward 653.536 2824.2 4311.94
Radiation dose in Kakuda 649.863 4265.42
Sakajiri Mihama Town 649.252 4677.58 4311.94
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2937.68 4311.94
Radiation dose in Onagawa (MP-2) 632.968 4262.69
Kumatori town Nishi primary school Station 631.491 3511.32 4311.94
Oshima Kawasaki Ward 630.402 2691.82 4311.94
Izumisano municipal Oike athletic field Station 629.920 3958.92 4311.94
Atom-kyoudou nursery school Station 625.566 3801.31 4311.94
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3460.9 4311.94
Nakamachi Omaezaki City 623.494 4456.92 4311.94
Uraga Yokosuka City 622.492 2111.83 4311.94
Goritoge Shika Town 622.143 4734.32 4311.94
Kumatori town Minami primary school Station 606.134 4028.26 4311.94
Radiation dose at JAEA Oarai (P1) 603.643 4268.16
Yamanotedai-No.1 Park Station 599.140 3757.17 4311.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4284.58
Noumi Shika Town 594.021 4683.86 4311.94
Radiation dose in Watari 591.851 4265.42
Hairando Yokosuka City 588.667 2647.68 4311.94
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2676.98 4298.26
Ningyotoge Kagamino Town 574.857 3757.17 4311.94
Ten-no Kagamino Town 569.960 4501.06 4311.94
Funagura Yokosuka City 563.909 2496.38 4311.94
Chidori Kawasaki Ward 560.211 2414.42 4311.94
Radiation dose at JAEA Oarai (P16) 556.365 4265.42
Shika Shika Town 551.376 4513.65 4311.94
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2931.36 4311.94
Sahara Yokosuka City 547.404 2338.77 4311.94
Kazanashi Shika Town 545.377 4236.29 4311.94
Akasumi Shika Town 544.970 3876.96 4311.94
Kurahashi Maizuru City 540.820 3530.23 4311.94
Obama Obama City 540.809 3158.3 4311.94
Sakuragaike community hall Omaezaki City 540.772 4570.39 4311.94
Shirowa primary school Omaezaki City 535.692 4475.83 4311.94
Radiation dose at JAEA Oarai (P5) 529.759 4265.42
Uenohara Omaezaki City 529.333 4601.93 4311.94
Kumano Shika Town 529.019 4393.9 4311.94
Izumisano municipal Hineno filtration plant Station 527.471 3788.72 4311.94
Nishi-hamasada Matsue City 525.089 4188.77 4295.52
Kouno Minami-Echizen Town 525.028 3177.22 4311.94
Kurihama Yokosuka City 523.708 2527.89 4311.94
Osaka prefectural Kumatori off-site-center Station 522.808 3492.4 4311.94
Ogasa branch Kikugawa City 522.039 4650.15 4298.26
Izumisano municipal Hineno primary scool Station 518.181 3032.24 4311.94
Shirasuna Omaezaki City 499.479 4507.37 4311.94
Jitougata primary school Makinohara City 498.059 4324.53 4311.94
Kataku Matsue City 497.007 3360.02 4311.94
Nishihemi Yokosuka City 496.917 2017.27 4311.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4284.58
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3309.6 4311.94
Otomi Takahama Town 494.821 3706.75 4311.94
Otsu Nanao City 493.895 3719.35 4311.94
The Observation point for comparison Tatsunokuchi 493.454 3063.74 4311.94
Hitsuhama Ohi Town 492.630 3448.3 4311.94
Kijiyama Misasa Town 489.284 3498.72 4311.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4284.58
Hiraba Omaezaki City 485.878 4507.37 4311.94
Tayu Matsue City 484.956 3505.04 4311.94
Hamaokakita primary school Omaezaki City 484.537 4618.74 4298.26
Oitomi Ayabe City 474.670 4444.32 4311.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4284.58
Kashiwazaki-shigai Kashiwazaki City 470.822 3536.54 4311.94
Mitsu Matsue City 466.897 3353.74 4311.94
Tonomachi Kawasaki Ward 463.967 4248.88 4311.94
Daitou branch Kakegawa City 463.829 4549.63 4298.26
Fukura Shika Town 462.493 4229.97 4311.94
Nagasawa Yokosuka City 462.365 2471.16 4311.94
The athletic field Station of Kinki University 461.661 2792.66 4311.94
Koura Matsue City 461.049 4003.03 4311.94
Sakurasan Ward Omaezaki City 459.434 4362.36 4311.94
Tsuchikawa Nanao City 458.915 4116.5 4311.94
Kumatori Town office Station 457.917 2880.94 4311.94
Shinkango Omaezaki City 449.013 5049.5 4311.94
Ogurui Takahama Town 448.279 3303.28 4311.94
Kusabue Omaezaki City 444.162 4759.51 4311.94
Omaezaki City monitoring center 443.946 4671.26 4311.94
Akawase Kagamino Town 442.246 2880.94 4311.94
Ibaraki 442.139 2114.11 4303.73
Hinode Town Yokosuka City 438.324 1664.26 4311.94
Nishiyama Kashiwazaki City 437.251 5005.36 4311.94
Kariwa Kariwa Village 436.307 3776.08 4311.94
Osaka prefectural Hineno high scool Station 435.745 3366.34 4311.94
Miyagawa Kashiwazaki City 435.245 3725.66 4311.94
Radiation dose in Natori 434.640 4265.42
Kami-koubu Matsue City 433.868 3662.61 4311.94
Shimo-Takamachi Kariwa Village 433.192 4110.22 4311.94
Osaka prefectural Sano supporting school Station 432.398 3668.93 4311.94
Arahama Kashiwazaki City 428.874 3839.14 4311.94
Doai Kashiwazaki City 425.681 3612.19 4311.94
Owashi Matsue City 424.452 3580.68 4311.94
Okayasu Maizuru City 422.568 4217.38 4311.94
Katsuyama Kariwa Village 421.280 3839.14 4311.94
Kita-koubu Matsue City 420.683 3927.38 4311.94
Kichisaka Maizuru City 413.065 5125.15 4311.94
Nagai Ohi Town 410.699 3724.88 4303.73
Shiokumi Maizuru City 407.938 6379.66 4311.94
Miyadome Ohi Town 407.831 3088.97 4311.94
Kariwa Kariwa Village 407.617 3977.84 4311.94
Ueno Satsuma-sendai City 394.248 2887.22 4311.94
Power Station-South 389.191 4204.78 4311.94
Radiation dose at JAEA Oarai (P6) 386.963 4265.42
Power Station- 385.546 4103.9 4311.94
Takae Satsuma-sendai City 379.551 2925.04 4311.94
Hokawaduura Genkai Town 378.015 4453.78 4311.94
Kou Itimatsu Suetsugu 377.929 3215.04 4311.94
Minato Satsuma-sendai City 377.656 2679.19 4311.94
Iwanai Iwanai Town 376.336 4365.9 4309.2
Hattari Kyowa Town 373.047 4246.19 4309.2
Chatsu Tomari Village 371.011 4057.19 4309.2
Oyama Maizuru City 358.223 3694.16 4311.94
Kodaira Satsuma-sendai City 355.545 2710.73 4311.94
Kayanuma Tomari Village 354.809 3609.9 4309.2
Anojiri Obama City 353.215 3025.92 4311.94
Kushi Genkai Town 349.738 6146.4 4311.94
Yamaguchi 348.715 4832.26 4303.73
Sadahongou Matsue City 348.228 3763.49 4311.94
Sakibe Karatsu City 347.801 5824.9 4311.94
Hirao Genkai Town 343.814 6140.08 4311.94
The Meteorological Obsevatory of kyowa Town 343.275 4025.7 4309.2
Minami-Horoni Kyowa Town 335.180 3773.69 4309.2
Kounoura Takahama Town 330.353 3189.81 4311.94
Kyoudomarisaki Karatsu City 328.622 6240.96 4311.94
Horikappu Jinja Tomari Village 328.230 3905.99 4309.2
Hukada-kita Matsue City 327.031 3095.25 4311.94
Radiation dose in KEK, Tsukuba 326.240 4284.58
Herokaruusu Tomari Village 324.242 4050.91 4309.2
Yorita Satsuma-sendai City 323.218 3170.9 4311.94
Kamoenai Kamoenai Village 322.032 3420.9 4309.2
Radiation dose in Onagawa (MP-6) 316.267 4262.69
Imamura Genkai Town 314.749 52890.4 4311.94
Yamanaka Takahama Town 314.185 4116.5 4311.94
Sendai (Miyagi) 312.585 1936.68 4303.73
Radiation dose in Onagawa (MP-1) 300.147 4262.69
Gumisaki Satsuma-sendai City 295.693 2559.44 4311.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4284.58
Aomori Aomori City 285.372 2601.89 4309.2
Misawa City hall Misawa City 283.728 5046.3 4309.2
Kashu Ikata Town 277.173 2641.36 4311.94
Noheji Town Office Noheji Town 272.004 2230.2 4309.2
Takasimamati 271.103 2811.57 4311.94
Radiation dose in Onagawa (MP-3) 270.563 4262.69
Kucho Ikata Town 269.545 2332.49 4311.94
Radiation dose in Marumori 269.436 4265.42
Kawanagata Ikata Town 266.821 2275.76 4311.94
Tochigi 260.733 2529.38 4303.73
Chikagawa Mutu City 256.719 2904.29 4309.2
Yokohama Town Office Yokohama Town 254.846 3559.51 4309.2
Tokyo 251.877 2982.41 4303.73
Hiranuma Rokkasho Village 251.186 2337.29 4309.2
Taisei Ikata Town 246.293 1708.4 4311.94
Chitose-daira Rokkasho Village 245.868 2520.01 4309.2
Gifu 243.951 4152.72 4303.73
Fukkoshi Yokohama Town 243.102 2444.41 4309.2
Shimane 240.651 4152.72 4303.73
Sunagomata Higashidoori Village 238.012 3534.3 4309.2
Obuchi Rokkasho Village 237.506 2809.79 4309.2
Tomari Rokkasho Village 230.636 3931.2 4309.2
kanagawa 226.339 2604.89 4303.73
Saitama 219.770 2265.12 4303.73
Ikatagoshi Ikata Town 217.515 2149.65 4311.94
Touhoku Branch office Touhoku Town 215.416 2034.89 4309.2
Radiation dose at Tohoku University 214.824 4265.42
Odanosawa Higashidoori Village 210.287 2816.1 4309.2
Kagawa 205.829 2906.9 4303.73
Oippe Higashidoori Village 205.182 2425.51 4309.2
Oita 200.921 3208.92 4303.73
Touhoku Town office Touhoku Town 200.811 9412.2 4309.2
Kuchogoshi Ikata Town 198.646 2181.2 4311.94
Minatoura Ikata Town 186.776 1960.53 4311.94
Radiation dose in Koyadori, Ojika 184.905 4259.95
Toyama 184.580 5549.54 4303.73
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2676.98 4298.26
Radiation dose in Tukahama, Ojika 183.417 4259.95
Chiba 182.407 1661.09 4303.73
Nara 182.387 3020.16 4303.73
Okayama 181.976 3926.21 4303.73
Yamagata 181.598 3095.66 4303.73
Ehime 180.745 2793.65 4303.73
Ishikawa 180.445 4813.38 4303.73
Niigata 177.483 5776.06 4303.73
Hiroshima 176.816 2604.89 4303.73
Mie 174.867 2978.63 4303.73
Fukui 170.045 3661.94 4303.73
Radiation dose in Terama, Ojika 168.036 4259.95
Yamanashi 164.561 2416.13 4303.73
Nagano 162.242 3677.04 4303.73
Saga 161.421 3246.67 4303.73
Tottori 161.392 2982.41 4303.73
Radiation dose in Enoshima, Ojika 160.091 4259.95
Osaka 159.103 2302.87 4303.73
Ibaraki-city Environment 157.249 4218.91
Aichi 149.345 2793.65 4303.73
Toyonoura Ikata Town 149.214 2250.53 4311.94
Shizuoka 148.639 2888.03 4303.73
Kyoto 144.522 3284.42 4303.73
Kagoshima 144.449 3560.01 4303.73
Tokushima 143.627 2529.38 4303.73
Gunma 143.572 1698.84 4303.73
Hyogo 139.710 2869.15 4303.73
Fukuoka 136.511 2982.41 4303.73
Wakayama 133.857 2114.11 4303.73
Radiation at Tamaki-cho Mie Japan 133.138 4218.91
Akita 132.832 3246.67 4303.73
Shiga 124.919 2302.87 4303.73
Nagasaki 109.459 2604.89 4303.73
Hokkaido 109.189 3963.96 4303.73
Kumamoto 103.568 2529.38 4303.73
Aomori 101.819 3850.7 4303.73
Miyazaki 100.354 2506.73 4303.73
Kochi 95.931 2869.15 4303.73
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2668.46 4284.58
Iwate 90.324 3171.17 4303.73
Environment Feeds from Ohta 83.623 4218.91
Okinawa 82.305 2170.74 4303.73
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