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Accumulated absorbed dose rate - T=13.03.2011 - 27.11.2014(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 3622.46
Fukushima I MP8 570942.000 3622.46
Fukushima I MP6 240668.000 3622.46
Yamada Futaba Town 176983.000 2667.96 3179.23
Fukushima I MP2 140420.000 3622.46
Fukushima I MP5 111325.000 3622.46
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2300.4 3693.6
Fukushima I MP3 93730.602 3622.46
Fukushima I MP4 86821.500 3622.46
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2300.4 3693.6
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2249.28 3611.52
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2300.4 3693.6
Ono Okuma Town 38610.500 2463.43 3179.23
Shinzan Futaba Town 38332.801 2235.7 3179.23
Fukushima I MP1 31496.801 3622.46
Yonomori Tomioka Town 29815.900 2547.09 3179.23
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2300.4 3693.6
Tomioka Tomioka Town 25324.500 2742.31 3179.23
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2300.4 3693.6
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2300.4 3693.6
Shimo-Kooriyama Tomioka Town 13057.000 2723.74 3179.23
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2300.4 3693.6
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2300.4 3693.6
Kami-kooriyama Tomioka Town 11803.900 2138.09 3179.23
Fukushima II MP3 11060.600 3622.46
Fukushima II MP1 10903.000 3622.46
Kooriyama Futaba Town 10352.900 2491.32 3179.23
Fukushima II MP4 9696.330 3622.46
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2296.99 3688.13
Fukushima II MP5 9382.150 3622.46
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2300.4 3693.6
Matsudate Naraha Town 8410.890 2909.64 3179.23
Shigeoka Naraha Town 8115.970 3216.41 3179.23
Fukushima II MP2 7875.320 3622.46
Namie Namie Town 7321.210 2347.25 3179.23
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3638.88
Fukushima II MP6 7062.690 3622.46
Fukushima II MP7 6511.580 3619.73
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2300.4 3693.6
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2300.4 3693.6
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2300.4 3693.6
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2300.4 3693.6
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2300.4 3693.6
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2300.4 3693.6
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2295.29 3685.39
Futatsunuma Hirono Town 3520.340 2788.8 3179.23
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2300.4 3693.6
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2300.4 3693.6
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3636.14
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2300.4 3693.6
Kiyohashi Namie Town 3162.000 2059.05 3179.23
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2295.29 3685.39
Radiation dose at Agricultural center, Koriyama 3128.960 3636.14
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2300.4 3693.6
Radiation dose at Koriyama city office, Koriyama 2803.520 3636.14
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2300.4 3693.6
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2295.29 3685.39
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2300.4 3693.6
Yamadaoka Naraha Town 2205.340 2472.75 3179.23
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3638.88
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2300.4 3693.6
Kuji Hitachi City 1990.890 5719.3 3704.54
Hitachinaka Hitachinaka City 1951.950 2511.16 3701.81
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2295.29 3685.39
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2295.29 3685.39
Momiyama Hokota City 1837.540 2865.07 3704.54
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2295.29 3685.39
Horiguchi Hitachinaka City 1779.410 2504.04 3707.28
Onuma Hitachi City 1776.950 2132.34 3701.81
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2300.4 3693.6
Tsukuriya Hokota City 1736.890 2410.13 3704.54
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3636.14
Nemoto Hitachioomiya City 1633.190 2684.36 3701.81
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2300.4 3693.6
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2300.4 3693.6
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3644.35
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2300.4 3693.6
Radiation dose at JAEA Oarai (P12) 1512.140 3660.77
Radiation dose at Ose administration center, Koriyama 1494.270 3636.14
Araji Hokota City 1437.760 2415.53 3704.54
Ishigami Tokai Village 1431.690 2198.91 3704.54
Mawatari Hitachinaka City 1422.870 2540.11 3704.54
Radiation dose at JAEA Oarai (P11) 1399.370 3660.77
Onuki Oarai Town 1387.990 2637.6 3704.54
Sawa Hitachinaka City 1353.770 1991.61 3701.81
Toyooka Tokai Village 1321.760 2420.95 3704.54
Ajigaura Hitachinaka City 1313.890 2381.27 3701.81
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2300.4 3693.6
Geiger Counter Feeds from Asao Kawasaki 1266.620 3614.26
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3636.14
Isohama Oarai Town 1250.540 2298.39 3699.07
Ebisawa Ibaraki Town 1222.240 6241.12 3701.81
Muramatsu Tokai Village 1203.520 2442.63 3704.54
Kamitoda Hokota City 1184.740 2003.93 3704.54
Yanagisawa Hitachinaka City 1166.970 2040.31 3701.81
Tokushuku Hokota City 1159.730 1808.95 3704.54
Tasaki Hokota City 1153.300 2132.69 3674.45
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2300.4 3693.6
Kadobe Naka City 1086.580 4859.99 3701.81
Radiation dose at Date city office, Date 1076.050 3638.88
Oshinobe Tokai Village 1041.340 2280.15 3704.54
Oba Mito City 1037.670 7490.33 3704.54
Godai Naka City 1031.270 1976.83 3704.54
Ishikawa Mito City 1030.810 2330.61 3707.28
Isobe Hitachiota City 1013.130 11243.6 3704.54
Yatabe Ibaraki Town 996.127 1955.19 3704.54
Radiation dose at Motomiya city office, Motomiya 992.703 3638.88
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2295.29 3685.39
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2295.29 3685.39
Yokobori Naka City 930.280 2290.97 3704.54
Sugaya Naka City 926.186 3501.33 3707.28
Kounosu Naka City 926.087 1787.28 3704.54
Funaishikawa Tokai Village 900.399 2372.21 3704.54
Nukada Naka City 899.900 2141.57 3699.07
Uridura Naka City 890.113 2044.22 3699.07
Shiraki Tsuruga City 881.330 4341.42 3707.28
Motokomezaki Naka City 880.851 1900.27 3671.71
Shiraki pass Tsuruga City 850.284 4547.37 3707.28
Radiation dose in Yamamoto 846.633 3660.77
Yoshizawa Mito City 837.646 2068.92 3704.54
Radiation dose at JAEA Oarai (P7) 831.135 3660.77
Mayumi Hitachiota City 828.119 2052.67 3704.54
Urasoko Tsuruga City 826.465 3604.29 3707.28
Nemoto Hitachioomiya City 825.588 2310.93 3701.81
Takenami Mihama Town 804.283 3783.15 3707.28
Radiation dose at JAEA Oarai (P15) 780.207 3660.77
Tateishi Tsuruga City 780.092 2997.27 3707.28
Radiation dose at JAEA Oarai (P14) 770.174 3660.77
Radiation dose at JAEA Oarai (P13) 769.612 3660.77
Ukishima Kawasaki Ward 735.475 7073.1 3707.28
Kume Hitachiota City 713.958 2009.33 3704.54
Radiation dose at JAEA Oarai (P2) 712.011 3660.77
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2295.29 3685.39
Nyuu Mihama Town 674.787 3447.12 3707.28
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2300.4 3693.6
Radiation dose in Iwanuma 670.242 3660.77
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2300.4 3693.6
Tsuruga Tsuruga City 655.360 3040.62 3707.28
Shiohama Kawasaki Ward 653.536 2428.17 3707.28
Radiation dose in Kakuda 649.863 3660.77
Sakajiri Mihama Town 649.252 4021.65 3707.28
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2525.73 3707.28
Radiation dose in Onagawa (MP-2) 632.968 3658.03
Kumatori town Nishi primary school Station 631.491 3018.93 3707.28
Oshima Kawasaki Ward 630.402 2314.35 3707.28
Izumisano municipal Oike athletic field Station 629.920 3403.77 3707.28
Atom-kyoudou nursery school Station 625.566 3268.26 3707.28
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2975.58 3707.28
Nakamachi Omaezaki City 623.494 3831.93 3707.28
Uraga Yokosuka City 622.492 1815.69 3707.28
Goritoge Shika Town 622.143 4070.43 3707.28
Kumatori town Minami primary school Station 606.134 3463.38 3707.28
Radiation dose at JAEA Oarai (P1) 603.643 3663.5
Yamanotedai-No.1 Park Station 599.140 3230.31 3707.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3679.92
Noumi Shika Town 594.021 4027.05 3707.28
Radiation dose in Watari 591.851 3660.77
Hairando Yokosuka City 588.667 2276.4 3707.28
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2300.4 3693.6
Ningyotoge Kagamino Town 574.857 3230.31 3707.28
Ten-no Kagamino Town 569.960 3869.88 3707.28
Funagura Yokosuka City 563.909 2146.32 3707.28
Chidori Kawasaki Ward 560.211 2075.85 3707.28
Radiation dose at JAEA Oarai (P16) 556.365 3660.77
Shika Shika Town 551.376 3880.71 3707.28
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2520.3 3707.28
Sahara Yokosuka City 547.404 2010.81 3707.28
Kazanashi Shika Town 545.377 3642.24 3707.28
Akasumi Shika Town 544.970 3333.3 3707.28
Kurahashi Maizuru City 540.820 3035.19 3707.28
Obama Obama City 540.809 2715.42 3707.28
Sakuragaike community hall Omaezaki City 540.772 3929.49 3707.28
Shirowa primary school Omaezaki City 535.692 3848.19 3707.28
Radiation dose at JAEA Oarai (P5) 529.759 3660.77
Uenohara Omaezaki City 529.333 3956.61 3707.28
Kumano Shika Town 529.019 3777.75 3707.28
Izumisano municipal Hineno filtration plant Station 527.471 3257.43 3707.28
Nishi-hamasada Matsue City 525.089 3599.14 3690.86
Kouno Minami-Echizen Town 525.028 2731.68 3707.28
Kurihama Yokosuka City 523.708 2173.41 3707.28
Osaka prefectural Kumatori off-site-center Station 522.808 3002.67 3707.28
Ogasa branch Kikugawa City 522.039 3995.99 3693.6
Izumisano municipal Hineno primary scool Station 518.181 2607.03 3707.28
Shirasuna Omaezaki City 499.479 3875.31 3707.28
Jitougata primary school Makinohara City 498.059 3718.11 3707.28
Kataku Matsue City 497.007 2888.85 3707.28
Nishihemi Yokosuka City 496.917 1734.39 3707.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3679.92
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2845.5 3707.28
Otomi Takahama Town 494.821 3186.96 3707.28
Otsu Nanao City 493.895 3197.79 3707.28
The Observation point for comparison Tatsunokuchi 493.454 2634.12 3707.28
Hitsuhama Ohi Town 492.630 2964.75 3707.28
Kijiyama Misasa Town 489.284 3008.1 3707.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3679.92
Hiraba Omaezaki City 485.878 3875.31 3707.28
Tayu Matsue City 484.956 3013.53 3707.28
Hamaokakita primary school Omaezaki City 484.537 3969 3693.6
Oitomi Ayabe City 474.670 3821.1 3707.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3679.92
Kashiwazaki-shigai Kashiwazaki City 470.822 3040.62 3707.28
Mitsu Matsue City 466.897 2883.45 3707.28
Tonomachi Kawasaki Ward 463.967 3653.07 3707.28
Daitou branch Kakegawa City 463.829 3909.61 3693.6
Fukura Shika Town 462.493 3636.81 3707.28
Nagasawa Yokosuka City 462.365 2124.63 3707.28
The athletic field Station of Kinki University 461.661 2401.05 3707.28
Koura Matsue City 461.049 3441.69 3707.28
Sakurasan Ward Omaezaki City 459.434 3750.63 3707.28
Tsuchikawa Nanao City 458.915 3539.25 3707.28
Kumatori Town office Station 457.917 2476.95 3707.28
Shinkango Omaezaki City 449.013 4341.42 3707.28
Ogurui Takahama Town 448.279 2840.07 3707.28
Kusabue Omaezaki City 444.162 4092.09 3707.28
Omaezaki City monitoring center 443.946 4016.22 3707.28
Akawase Kagamino Town 442.246 2476.95 3707.28
Ibaraki 442.139 1817.09 3699.07
Hinode Town Yokosuka City 438.324 1430.88 3707.28
Nishiyama Kashiwazaki City 437.251 4303.47 3707.28
Kariwa Kariwa Village 436.307 3246.57 3707.28
Osaka prefectural Hineno high scool Station 435.745 2894.28 3707.28
Miyagawa Kashiwazaki City 435.245 3203.22 3707.28
Radiation dose in Natori 434.640 3660.77
Kami-koubu Matsue City 433.868 3149.01 3707.28
Shimo-Takamachi Kariwa Village 433.192 3533.85 3707.28
Osaka prefectural Sano supporting school Station 432.398 3154.44 3707.28
Arahama Kashiwazaki City 428.874 3300.78 3707.28
Doai Kashiwazaki City 425.681 3105.66 3707.28
Owashi Matsue City 424.452 3078.57 3707.28
Okayasu Maizuru City 422.568 3625.98 3707.28
Katsuyama Kariwa Village 421.280 3300.78 3707.28
Kita-koubu Matsue City 420.683 3376.65 3707.28
Kichisaka Maizuru City 413.065 4406.46 3707.28
Nagai Ohi Town 410.699 3201.55 3699.07
Shiokumi Maizuru City 407.938 5485.05 3707.28
Miyadome Ohi Town 407.831 2655.81 3707.28
Kariwa Kariwa Village 407.617 3420.03 3707.28
Ueno Satsuma-sendai City 394.248 2482.35 3707.28
Power Station-South 389.191 3615.15 3707.28
Radiation dose at JAEA Oarai (P6) 386.963 3660.77
Power Station- 385.546 3528.42 3707.28
Takae Satsuma-sendai City 379.551 2514.87 3707.28
Hokawaduura Genkai Town 378.015 3829.23 3707.28
Kou Itimatsu Suetsugu 377.929 2764.2 3707.28
Minato Satsuma-sendai City 377.656 2303.49 3707.28
Iwanai Iwanai Town 376.336 3753.29 3704.54
Hattari Kyowa Town 373.047 3650.37 3704.54
Chatsu Tomari Village 371.011 3487.89 3704.54
Oyama Maizuru City 358.223 3176.13 3707.28
Kodaira Satsuma-sendai City 355.545 2330.61 3707.28
Kayanuma Tomari Village 354.809 3103.37 3704.54
Anojiri Obama City 353.215 2601.6 3707.28
Kushi Genkai Town 349.738 5284.5 3707.28
Yamaguchi 348.715 4153.34 3699.07
Sadahongou Matsue City 348.228 3235.74 3707.28
Sakibe Karatsu City 347.801 5008.08 3707.28
Hirao Genkai Town 343.814 5279.07 3707.28
The Meteorological Obsevatory of kyowa Town 343.275 3460.82 3704.54
Minami-Horoni Kyowa Town 335.180 3244.17 3704.54
Kounoura Takahama Town 330.353 2742.51 3707.28
Kyoudomarisaki Karatsu City 328.622 5365.8 3707.28
Horikappu Jinja Tomari Village 328.230 3357.91 3704.54
Hukada-kita Matsue City 327.031 2661.21 3707.28
Radiation dose in KEK, Tsukuba 326.240 3679.92
Herokaruusu Tomari Village 324.242 3482.5 3704.54
Yorita Satsuma-sendai City 323.218 2726.25 3707.28
Kamoenai Kamoenai Village 322.032 2940.89 3704.54
Radiation dose in Onagawa (MP-6) 316.267 3658.03
Imamura Genkai Town 314.749 45473.7 3707.28
Yamanaka Takahama Town 314.185 3539.25 3707.28
Sendai (Miyagi) 312.585 1664.58 3699.07
Radiation dose in Onagawa (MP-1) 300.147 3658.03
Gumisaki Satsuma-sendai City 295.693 2200.53 3707.28
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3679.92
Aomori Aomori City 285.372 2236.8 3704.54
Misawa City hall Misawa City 283.728 4338.22 3704.54
Kashu Ikata Town 277.173 2270.97 3707.28
Noheji Town Office Noheji Town 272.004 1917.26 3704.54
Takasimamati 271.103 2417.31 3707.28
Radiation dose in Onagawa (MP-3) 270.563 3658.03
Kucho Ikata Town 269.545 2005.41 3707.28
Radiation dose in Marumori 269.436 3660.77
Kawanagata Ikata Town 266.821 1956.63 3707.28
Tochigi 260.733 2174.02 3699.07
Chikagawa Mutu City 256.719 2496.77 3704.54
Yokohama Town Office Yokohama Town 254.846 3060.05 3704.54
Tokyo 251.877 2563.39 3699.07
Hiranuma Rokkasho Village 251.186 2009.33 3704.54
Taisei Ikata Town 246.293 1468.83 3707.28
Chitose-daira Rokkasho Village 245.868 2166.41 3704.54
Gifu 243.951 3569.28 3699.07
Fukkoshi Yokohama Town 243.102 2101.42 3704.54
Shimane 240.651 3569.28 3699.07
Sunagomata Higashidoori Village 238.012 3038.38 3704.54
Obuchi Rokkasho Village 237.506 2415.53 3704.54
Tomari Rokkasho Village 230.636 3379.58 3704.54
kanagawa 226.339 2238.91 3699.07
Saitama 219.770 1946.88 3699.07
Ikatagoshi Ikata Town 217.515 1848.21 3707.28
Touhoku Branch office Touhoku Town 215.416 1749.36 3704.54
Radiation dose at Tohoku University 214.824 3660.77
Odanosawa Higashidoori Village 210.287 2420.95 3704.54
Kagawa 205.829 2498.5 3699.07
Oippe Higashidoori Village 205.182 2085.17 3704.54
Oita 200.921 2758.08 3699.07
Touhoku Town office Touhoku Town 200.811 8091.5 3704.54
Kuchogoshi Ikata Town 198.646 1875.33 3707.28
Minatoura Ikata Town 186.776 1685.61 3707.28
Radiation dose in Koyadori, Ojika 184.905 3655.3
Toyama 184.580 4769.86 3699.07
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2300.4 3693.6
Radiation dose in Tukahama, Ojika 183.417 3655.3
Chiba 182.407 1427.71 3699.07
Nara 182.387 2595.84 3699.07
Okayama 181.976 3374.59 3699.07
Yamagata 181.598 2660.74 3699.07
Ehime 180.745 2401.15 3699.07
Ishikawa 180.445 4137.12 3699.07
Niigata 177.483 4964.54 3699.07
Hiroshima 176.816 2238.91 3699.07
Mie 174.867 2560.15 3699.07
Fukui 170.045 3147.46 3699.07
Radiation dose in Terama, Ojika 168.036 3655.3
Yamanashi 164.561 2076.67 3699.07
Nagano 162.242 3160.44 3699.07
Saga 161.421 2790.53 3699.07
Tottori 161.392 2563.39 3699.07
Radiation dose in Enoshima, Ojika 160.091 3655.3
Osaka 159.103 1979.33 3699.07
Ibaraki-city Environment 157.249 3614.26
Aichi 149.345 2401.15 3699.07
Toyonoura Ikata Town 149.214 1934.94 3707.28
Shizuoka 148.639 2482.27 3699.07
Kyoto 144.522 2822.98 3699.07
Kagoshima 144.449 3059.85 3699.07
Tokushima 143.627 2174.02 3699.07
Gunma 143.572 1460.16 3699.07
Hyogo 139.710 2466.05 3699.07
Fukuoka 136.511 2563.39 3699.07
Wakayama 133.857 1817.09 3699.07
Radiation at Tamaki-cho Mie Japan 133.138 3614.26
Akita 132.832 2790.53 3699.07
Shiga 124.919 1979.33 3699.07
Nagasaki 109.459 2238.91 3699.07
Hokkaido 109.189 3407.04 3699.07
Kumamoto 103.568 2174.02 3699.07
Aomori 101.819 3309.7 3699.07
Miyazaki 100.354 2154.55 3699.07
Kochi 95.931 2466.05 3699.07
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2291.88 3679.92
Iwate 90.324 2725.63 3699.07
Environment Feeds from Ohta 83.623 3614.26
Okinawa 82.305 1865.76 3699.07
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