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Accumulated absorbed dose rate - T=13.03.2011 - 04.08.2015(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 4306.46
Fukushima I MP8 570942.000 4306.46
Fukushima I MP6 240668.000 4306.46
Yamada Futaba Town 176983.000 3241.96 3863.23
Fukushima I MP2 140420.000 4306.46
Fukushima I MP5 111325.000 4306.46
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2726.4 4377.6
Fukushima I MP3 93730.602 4306.46
Fukushima I MP4 86821.500 4306.46
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2726.4 4377.6
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2675.28 4295.52
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2726.4 4377.6
Ono Okuma Town 38610.500 2993.43 3863.23
Shinzan Futaba Town 38332.801 2716.7 3863.23
Fukushima I MP1 31496.801 4306.46
Yonomori Tomioka Town 29815.900 3095.09 3863.23
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2726.4 4377.6
Tomioka Tomioka Town 25324.500 3332.31 3863.23
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2726.4 4377.6
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2726.4 4377.6
Shimo-Kooriyama Tomioka Town 13057.000 3309.74 3863.23
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2726.4 4377.6
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2726.4 4377.6
Kami-kooriyama Tomioka Town 11803.900 2598.09 3863.23
Fukushima II MP3 11060.600 4306.46
Fukushima II MP1 10903.000 4306.46
Kooriyama Futaba Town 10352.900 3027.32 3863.23
Fukushima II MP4 9696.330 4306.46
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2722.99 4372.13
Fukushima II MP5 9382.150 4306.46
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2726.4 4377.6
Matsudate Naraha Town 8410.890 3535.64 3863.23
Shigeoka Naraha Town 8115.970 3908.4 3863.23
Fukushima II MP2 7875.320 4306.46
Namie Namie Town 7321.210 2852.25 3863.23
Radiation dose at Shirasawa branch office, Motomiya 7287.920 4322.88
Fukushima II MP6 7062.690 4306.46
Fukushima II MP7 6511.580 4303.73
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2726.4 4377.6
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2726.4 4377.6
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2726.4 4377.6
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2726.4 4377.6
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2726.4 4377.6
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2726.4 4377.6
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2721.29 4369.39
Futatsunuma Hirono Town 3520.340 3388.8 3863.23
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2726.4 4377.6
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2726.4 4377.6
Radiation dose at Koriyama joint government building, Koriyama 3232.890 4320.14
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2726.4 4377.6
Kiyohashi Namie Town 3162.000 2502.05 3863.23
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2721.29 4369.39
Radiation dose at Agricultural center, Koriyama 3128.960 4320.14
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2726.4 4377.6
Radiation dose at Koriyama city office, Koriyama 2803.520 4320.14
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2726.4 4377.6
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2721.29 4369.39
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2726.4 4377.6
Yamadaoka Naraha Town 2205.340 3004.75 3863.23
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 4322.88
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2726.4 4377.6
Kuji Hitachi City 1990.890 6775.3 4388.54
Hitachinaka Hitachinaka City 1951.950 2975.16 4385.81
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2721.29 4369.39
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2721.29 4369.39
Momiyama Hokota City 1837.540 3394.08 4388.54
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2721.29 4369.39
Horiguchi Hitachinaka City 1779.410 2966.04 4391.28
Onuma Hitachi City 1776.950 2526.34 4385.81
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2726.4 4377.6
Tsukuriya Hokota City 1736.890 2855.13 4388.54
Radiation dose at Big palette Fukushima, Koriyama 1668.540 4320.14
Nemoto Hitachioomiya City 1633.190 3180.36 4385.81
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2726.4 4377.6
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2726.4 4377.6
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 4328.35
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2726.4 4377.6
Radiation dose at JAEA Oarai (P12) 1512.140 4344.77
Radiation dose at Ose administration center, Koriyama 1494.270 4320.14
Araji Hokota City 1437.760 2861.52 4388.54
Ishigami Tokai Village 1431.690 2604.91 4388.54
Mawatari Hitachinaka City 1422.870 3009.12 4388.54
Radiation dose at JAEA Oarai (P11) 1399.370 4344.77
Onuki Oarai Town 1387.990 3124.6 4388.54
Sawa Hitachinaka City 1353.770 2359.6 4385.81
Toyooka Tokai Village 1321.760 2867.95 4388.54
Ajigaura Hitachinaka City 1313.890 2821.27 4385.81
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2726.4 4377.6
Geiger Counter Feeds from Asao Kawasaki 1266.620 4298.26
Radiation dose at Tamokami elementary school, Koriyama 1256.140 4320.14
Isohama Oarai Town 1250.540 2723.39 4383.07
Ebisawa Ibaraki Town 1222.240 7394.32 4385.81
Muramatsu Tokai Village 1203.520 2893.63 4388.54
Kamitoda Hokota City 1184.740 2373.93 4388.54
Yanagisawa Hitachinaka City 1166.970 2417.31 4385.81
Tokushuku Hokota City 1159.730 2142.96 4388.54
Tasaki Hokota City 1153.300 2529.7 4358.45
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2726.4 4377.6
Kadobe Naka City 1086.580 5757.99 4385.81
Radiation dose at Date city office, Date 1076.050 4322.88
Oshinobe Tokai Village 1041.340 2701.15 4388.54
Oba Mito City 1037.670 8873.33 4388.54
Godai Naka City 1031.270 2341.83 4388.54
Ishikawa Mito City 1030.810 2760.61 4391.28
Isobe Hitachiota City 1013.130 13319.6 4388.54
Yatabe Ibaraki Town 996.127 2316.19 4388.54
Radiation dose at Motomiya city office, Motomiya 992.703 4322.88
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2721.29 4369.39
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2721.29 4369.39
Yokobori Naka City 930.280 2713.97 4388.54
Sugaya Naka City 926.186 4147.33 4391.28
Kounosu Naka City 926.087 2117.28 4388.54
Funaishikawa Tokai Village 900.399 2810.21 4388.54
Nukada Naka City 899.900 2537.57 4383.07
Uridura Naka City 890.113 2422.22 4383.07
Shiraki Tsuruga City 881.330 5142.42 4391.28
Motokomezaki Naka City 880.851 2254.27 4355.71
Shiraki pass Tsuruga City 850.284 5386.37 4391.28
Radiation dose in Yamamoto 846.633 4344.77
Yoshizawa Mito City 837.646 2450.92 4388.54
Radiation dose at JAEA Oarai (P7) 831.135 4344.77
Mayumi Hitachiota City 828.119 2431.68 4388.54
Urasoko Tsuruga City 826.465 4269.29 4391.28
Nemoto Hitachioomiya City 825.588 2737.94 4385.81
Takenami Mihama Town 804.283 4481.15 4391.28
Radiation dose at JAEA Oarai (P15) 780.207 4344.77
Tateishi Tsuruga City 780.092 3550.27 4391.28
Radiation dose at JAEA Oarai (P14) 770.174 4344.77
Radiation dose at JAEA Oarai (P13) 769.612 4344.77
Ukishima Kawasaki Ward 735.475 8378.1 4391.28
Kume Hitachiota City 713.958 2380.32 4388.54
Radiation dose at JAEA Oarai (P2) 712.011 4344.77
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2721.29 4369.39
Nyuu Mihama Town 674.787 4083.12 4391.28
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2726.4 4377.6
Radiation dose in Iwanuma 670.242 4344.77
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2726.4 4377.6
Tsuruga Tsuruga City 655.360 3601.62 4391.28
Shiohama Kawasaki Ward 653.536 2876.17 4391.28
Radiation dose in Kakuda 649.863 4344.77
Sakajiri Mihama Town 649.252 4763.65 4391.28
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2991.73 4391.28
Radiation dose in Onagawa (MP-2) 632.968 4342.03
Kumatori town Nishi primary school Station 631.491 3575.93 4391.28
Oshima Kawasaki Ward 630.402 2741.35 4391.28
Izumisano municipal Oike athletic field Station 629.920 4031.77 4391.28
Atom-kyoudou nursery school Station 625.566 3871.26 4391.28
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3524.58 4391.28
Nakamachi Omaezaki City 623.494 4538.93 4391.28
Uraga Yokosuka City 622.492 2150.69 4391.28
Goritoge Shika Town 622.143 4821.43 4391.28
Kumatori town Minami primary school Station 606.134 4102.38 4391.28
Radiation dose at JAEA Oarai (P1) 603.643 4347.5
Yamanotedai-No.1 Park Station 599.140 3826.31 4391.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4363.92
Noumi Shika Town 594.021 4770.05 4391.28
Radiation dose in Watari 591.851 4344.77
Hairando Yokosuka City 588.667 2696.4 4391.28
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2726.4 4377.6
Ningyotoge Kagamino Town 574.857 3826.31 4391.28
Ten-no Kagamino Town 569.960 4583.88 4391.28
Funagura Yokosuka City 563.909 2542.32 4391.28
Chidori Kawasaki Ward 560.211 2458.85 4391.28
Radiation dose at JAEA Oarai (P16) 556.365 4344.77
Shika Shika Town 551.376 4596.71 4391.28
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2985.3 4391.28
Sahara Yokosuka City 547.404 2381.81 4391.28
Kazanashi Shika Town 545.377 4314.24 4391.28
Akasumi Shika Town 544.970 3948.3 4391.28
Kurahashi Maizuru City 540.820 3595.19 4391.28
Obama Obama City 540.809 3216.42 4391.28
Sakuragaike community hall Omaezaki City 540.772 4654.49 4391.28
Shirowa primary school Omaezaki City 535.692 4558.19 4391.28
Radiation dose at JAEA Oarai (P5) 529.759 4344.77
Uenohara Omaezaki City 529.333 4686.61 4391.28
Kumano Shika Town 529.019 4474.75 4391.28
Izumisano municipal Hineno filtration plant Station 527.471 3858.43 4391.28
Nishi-hamasada Matsue City 525.089 4266.14 4374.86
Kouno Minami-Echizen Town 525.028 3235.68 4391.28
Kurihama Yokosuka City 523.708 2574.41 4391.28
Osaka prefectural Kumatori off-site-center Station 522.808 3556.67 4391.28
Ogasa branch Kikugawa City 522.039 4735.99 4377.6
Izumisano municipal Hineno primary scool Station 518.181 3088.03 4391.28
Shirasuna Omaezaki City 499.479 4590.31 4391.28
Jitougata primary school Makinohara City 498.059 4404.11 4391.28
Kataku Matsue City 497.007 3421.85 4391.28
Nishihemi Yokosuka City 496.917 2054.39 4391.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4363.92
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3370.5 4391.28
Otomi Takahama Town 494.821 3774.96 4391.28
Otsu Nanao City 493.895 3787.79 4391.28
The Observation point for comparison Tatsunokuchi 493.454 3120.12 4391.28
Hitsuhama Ohi Town 492.630 3511.75 4391.28
Kijiyama Misasa Town 489.284 3563.1 4391.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4363.92
Hiraba Omaezaki City 485.878 4590.31 4391.28
Tayu Matsue City 484.956 3569.53 4391.28
Hamaokakita primary school Omaezaki City 484.537 4704 4377.6
Oitomi Ayabe City 474.670 4526.1 4391.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4363.92
Kashiwazaki-shigai Kashiwazaki City 470.822 3601.62 4391.28
Mitsu Matsue City 466.897 3415.45 4391.28
Tonomachi Kawasaki Ward 463.967 4327.07 4391.28
Daitou branch Kakegawa City 463.829 4633.61 4377.6
Fukura Shika Town 462.493 4307.81 4391.28
Nagasawa Yokosuka City 462.365 2516.63 4391.28
The athletic field Station of Kinki University 461.661 2844.05 4391.28
Koura Matsue City 461.049 4076.69 4391.28
Sakurasan Ward Omaezaki City 459.434 4442.63 4391.28
Tsuchikawa Nanao City 458.915 4192.25 4391.28
Kumatori Town office Station 457.917 2933.95 4391.28
Shinkango Omaezaki City 449.013 5142.42 4391.28
Ogurui Takahama Town 448.279 3364.07 4391.28
Kusabue Omaezaki City 444.162 4847.09 4391.28
Omaezaki City monitoring center 443.946 4757.22 4391.28
Akawase Kagamino Town 442.246 2933.95 4391.28
Ibaraki 442.139 2153.09 4383.07
Hinode Town Yokosuka City 438.324 1694.88 4391.28
Nishiyama Kashiwazaki City 437.251 5097.47 4391.28
Kariwa Kariwa Village 436.307 3845.57 4391.28
Osaka prefectural Hineno high scool Station 435.745 3428.28 4391.28
Miyagawa Kashiwazaki City 435.245 3794.22 4391.28
Radiation dose in Natori 434.640 4344.77
Kami-koubu Matsue City 433.868 3730.01 4391.28
Shimo-Takamachi Kariwa Village 433.192 4185.85 4391.28
Osaka prefectural Sano supporting school Station 432.398 3736.44 4391.28
Arahama Kashiwazaki City 428.874 3909.78 4391.28
Doai Kashiwazaki City 425.681 3678.66 4391.28
Owashi Matsue City 424.452 3646.57 4391.28
Okayasu Maizuru City 422.568 4294.98 4391.28
Katsuyama Kariwa Village 421.280 3909.78 4391.28
Kita-koubu Matsue City 420.683 3999.65 4391.28
Kichisaka Maizuru City 413.065 5219.46 4391.28
Nagai Ohi Town 410.699 3793.55 4383.07
Shiokumi Maizuru City 407.938 6497.05 4391.28
Miyadome Ohi Town 407.831 3145.81 4391.28
Kariwa Kariwa Village 407.617 4051.03 4391.28
Ueno Satsuma-sendai City 394.248 2940.35 4391.28
Power Station-South 389.191 4282.15 4391.28
Radiation dose at JAEA Oarai (P6) 386.963 4344.77
Power Station- 385.546 4179.42 4391.28
Takae Satsuma-sendai City 379.551 2978.87 4391.28
Hokawaduura Genkai Town 378.015 4535.73 4391.28
Kou Itimatsu Suetsugu 377.929 3274.2 4391.28
Minato Satsuma-sendai City 377.656 2728.49 4391.28
Iwanai Iwanai Town 376.336 4446.29 4388.54
Hattari Kyowa Town 373.047 4324.37 4388.54
Chatsu Tomari Village 371.011 4131.89 4388.54
Oyama Maizuru City 358.223 3762.13 4391.28
Kodaira Satsuma-sendai City 355.545 2760.61 4391.28
Kayanuma Tomari Village 354.809 3676.37 4388.54
Anojiri Obama City 353.215 3081.6 4391.28
Kushi Genkai Town 349.738 6259.5 4391.28
Yamaguchi 348.715 4921.34 4383.07
Sadahongou Matsue City 348.228 3832.74 4391.28
Sakibe Karatsu City 347.801 5932.08 4391.28
Hirao Genkai Town 343.814 6253.07 4391.28
The Meteorological Obsevatory of kyowa Town 343.275 4099.82 4388.54
Minami-Horoni Kyowa Town 335.180 3843.17 4388.54
Kounoura Takahama Town 330.353 3248.51 4391.28
Kyoudomarisaki Karatsu City 328.622 6355.8 4391.28
Horikappu Jinja Tomari Village 328.230 3977.91 4388.54
Hukada-kita Matsue City 327.031 3152.21 4391.28
Radiation dose in KEK, Tsukuba 326.240 4363.92
Herokaruusu Tomari Village 324.242 4125.5 4388.54
Yorita Satsuma-sendai City 323.218 3229.25 4391.28
Kamoenai Kamoenai Village 322.032 3483.89 4388.54
Radiation dose in Onagawa (MP-6) 316.267 4342.03
Imamura Genkai Town 314.749 53863.7 4391.28
Yamanaka Takahama Town 314.185 4192.25 4391.28
Sendai (Miyagi) 312.585 1972.38 4383.07
Radiation dose in Onagawa (MP-1) 300.147 4342.03
Gumisaki Satsuma-sendai City 295.693 2606.53 4391.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4363.92
Aomori Aomori City 285.372 2649.8 4388.54
Misawa City hall Misawa City 283.728 5139.22 4388.54
Kashu Ikata Town 277.173 2689.97 4391.28
Noheji Town Office Noheji Town 272.004 2271.26 4388.54
Takasimamati 271.103 2863.31 4391.28
Radiation dose in Onagawa (MP-3) 270.563 4342.03
Kucho Ikata Town 269.545 2375.41 4391.28
Radiation dose in Marumori 269.436 4344.77
Kawanagata Ikata Town 266.821 2317.63 4391.28
Tochigi 260.733 2576.02 4383.07
Chikagawa Mutu City 256.719 2957.76 4388.54
Yokohama Town Office Yokohama Town 254.846 3625.05 4388.54
Tokyo 251.877 3037.39 4383.07
Hiranuma Rokkasho Village 251.186 2380.32 4388.54
Taisei Ikata Town 246.293 1739.83 4391.28
Chitose-daira Rokkasho Village 245.868 2566.41 4388.54
Gifu 243.951 4229.28 4383.07
Fukkoshi Yokohama Town 243.102 2489.42 4388.54
Shimane 240.651 4229.28 4383.07
Sunagomata Higashidoori Village 238.012 3599.38 4388.54
Obuchi Rokkasho Village 237.506 2861.52 4388.54
Tomari Rokkasho Village 230.636 4003.58 4388.54
kanagawa 226.339 2652.91 4383.07
Saitama 219.770 2306.88 4383.07
Ikatagoshi Ikata Town 217.515 2189.21 4391.28
Touhoku Branch office Touhoku Town 215.416 2072.36 4388.54
Radiation dose at Tohoku University 214.824 4344.77
Odanosawa Higashidoori Village 210.287 2867.95 4388.54
Kagawa 205.829 2960.5 4383.07
Oippe Higashidoori Village 205.182 2470.17 4388.54
Oita 200.921 3268.08 4383.07
Touhoku Town office Touhoku Town 200.811 9585.5 4388.54
Kuchogoshi Ikata Town 198.646 2221.33 4391.28
Minatoura Ikata Town 186.776 1996.61 4391.28
Radiation dose in Koyadori, Ojika 184.905 4339.3
Toyama 184.580 5651.86 4383.07
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2726.4 4377.6
Radiation dose in Tukahama, Ojika 183.417 4339.3
Chiba 182.407 1691.71 4383.07
Nara 182.387 3075.84 4383.07
Okayama 181.976 3998.59 4383.07
Yamagata 181.598 3152.74 4383.07
Ehime 180.745 2845.15 4383.07
Ishikawa 180.445 4902.12 4383.07
Niigata 177.483 5882.54 4383.07
Hiroshima 176.816 2652.91 4383.07
Mie 174.867 3033.55 4383.07
Fukui 170.045 3729.46 4383.07
Radiation dose in Terama, Ojika 168.036 4339.3
Yamanashi 164.561 2460.67 4383.07
Nagano 162.242 3744.84 4383.07
Saga 161.421 3306.53 4383.07
Tottori 161.392 3037.39 4383.07
Radiation dose in Enoshima, Ojika 160.091 4339.3
Osaka 159.103 2345.33 4383.07
Ibaraki-city Environment 157.249 4298.26
Aichi 149.345 2845.15 4383.07
Toyonoura Ikata Town 149.214 2291.94 4391.28
Shizuoka 148.639 2941.27 4383.07
Kyoto 144.522 3344.98 4383.07
Kagoshima 144.449 3625.65 4383.07
Tokushima 143.627 2576.02 4383.07
Gunma 143.572 1730.16 4383.07
Hyogo 139.710 2922.05 4383.07
Fukuoka 136.511 3037.39 4383.07
Wakayama 133.857 2153.09 4383.07
Radiation at Tamaki-cho Mie Japan 133.138 4298.26
Akita 132.832 3306.53 4383.07
Shiga 124.919 2345.33 4383.07
Nagasaki 109.459 2652.91 4383.07
Hokkaido 109.189 4037.04 4383.07
Kumamoto 103.568 2576.02 4383.07
Aomori 101.819 3921.7 4383.07
Miyazaki 100.354 2552.95 4383.07
Kochi 95.931 2922.05 4383.07
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2717.88 4363.92
Iwate 90.324 3229.63 4383.07
Environment Feeds from Ohta 83.623 4298.26
Okinawa 82.305 2210.76 4383.07
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