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Accumulated absorbed dose rate - T=13.03.2011 - 31.10.2014(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 3548.59
Fukushima I MP8 570942.000 3548.59
Fukushima I MP6 240668.000 3548.59
Yamada Futaba Town 176983.000 2605.97 3105.36
Fukushima I MP2 140420.000 3548.59
Fukushima I MP5 111325.000 3548.59
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2254.39 3619.73
Fukushima I MP3 93730.602 3548.59
Fukushima I MP4 86821.500 3548.59
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2254.39 3619.73
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2203.27 3537.65
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2254.39 3619.73
Ono Okuma Town 38610.500 2406.19 3105.36
Shinzan Futaba Town 38332.801 2183.75 3105.36
Fukushima I MP1 31496.801 3548.59
Yonomori Tomioka Town 29815.900 2487.91 3105.36
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2254.39 3619.73
Tomioka Tomioka Town 25324.500 2678.59 3105.36
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2254.39 3619.73
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2254.39 3619.73
Shimo-Kooriyama Tomioka Town 13057.000 2660.45 3105.36
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2254.39 3619.73
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2254.39 3619.73
Kami-kooriyama Tomioka Town 11803.900 2088.41 3105.36
Fukushima II MP3 11060.600 3548.59
Fukushima II MP1 10903.000 3548.59
Kooriyama Futaba Town 10352.900 2433.43 3105.36
Fukushima II MP4 9696.330 3548.59
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2250.98 3614.26
Fukushima II MP5 9382.150 3548.59
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2254.39 3619.73
Matsudate Naraha Town 8410.890 2842.03 3105.36
Shigeoka Naraha Town 8115.970 3141.67 3105.36
Fukushima II MP2 7875.320 3548.59
Namie Namie Town 7321.210 2292.71 3105.36
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3565.01
Fukushima II MP6 7062.690 3548.59
Fukushima II MP7 6511.580 3545.86
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2254.39 3619.73
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2254.39 3619.73
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2254.39 3619.73
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2254.39 3619.73
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2254.39 3619.73
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2254.39 3619.73
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2249.28 3611.52
Futatsunuma Hirono Town 3520.340 2724 3105.36
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2254.39 3619.73
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2254.39 3619.73
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3562.27
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2254.39 3619.73
Kiyohashi Namie Town 3162.000 2011.21 3105.36
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2249.28 3611.52
Radiation dose at Agricultural center, Koriyama 3128.960 3562.27
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2254.39 3619.73
Radiation dose at Koriyama city office, Koriyama 2803.520 3562.27
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2254.39 3619.73
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2249.28 3611.52
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2254.39 3619.73
Yamadaoka Naraha Town 2205.340 2415.29 3105.36
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3565.01
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2254.39 3619.73
Kuji Hitachi City 1990.890 5605.25 3630.67
Hitachinaka Hitachinaka City 1951.950 2461.05 3627.94
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2249.28 3611.52
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2249.28 3611.52
Momiyama Hokota City 1837.540 2807.94 3630.67
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2249.28 3611.52
Horiguchi Hitachinaka City 1779.410 2454.14 3633.41
Onuma Hitachi City 1776.950 2089.79 3627.94
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2254.39 3619.73
Tsukuriya Hokota City 1736.890 2362.07 3630.67
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3562.27
Nemoto Hitachioomiya City 1633.190 2630.79 3627.94
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2254.39 3619.73
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2254.39 3619.73
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3570.48
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2254.39 3619.73
Radiation dose at JAEA Oarai (P12) 1512.140 3586.9
Radiation dose at Ose administration center, Koriyama 1494.270 3562.27
Araji Hokota City 1437.760 2367.36 3630.67
Ishigami Tokai Village 1431.690 2155.06 3630.67
Mawatari Hitachinaka City 1422.870 2489.46 3630.67
Radiation dose at JAEA Oarai (P11) 1399.370 3586.9
Onuki Oarai Town 1387.990 2585.01 3630.67
Sawa Hitachinaka City 1353.770 1951.86 3627.94
Toyooka Tokai Village 1321.760 2372.68 3630.67
Ajigaura Hitachinaka City 1313.890 2333.75 3627.94
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2254.39 3619.73
Geiger Counter Feeds from Asao Kawasaki 1266.620 3540.38
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3562.27
Isohama Oarai Town 1250.540 2252.49 3625.2
Ebisawa Ibaraki Town 1222.240 6116.57 3627.94
Muramatsu Tokai Village 1203.520 2393.92 3630.67
Kamitoda Hokota City 1184.740 1963.97 3630.67
Yanagisawa Hitachinaka City 1166.970 1999.6 3627.94
Tokushuku Hokota City 1159.730 1772.88 3630.67
Tasaki Hokota City 1153.300 2089.82 3600.58
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2254.39 3619.73
Kadobe Naka City 1086.580 4763 3627.94
Radiation dose at Date city office, Date 1076.050 3565.01
Oshinobe Tokai Village 1041.340 2234.68 3630.67
Oba Mito City 1037.670 7340.96 3630.67
Godai Naka City 1031.270 1937.41 3630.67
Ishikawa Mito City 1030.810 2284.17 3633.41
Isobe Hitachiota City 1013.130 11019.4 3630.67
Yatabe Ibaraki Town 996.127 1916.2 3630.67
Radiation dose at Motomiya city office, Motomiya 992.703 3565.01
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2249.28 3611.52
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2249.28 3611.52
Yokobori Naka City 930.280 2245.28 3630.67
Sugaya Naka City 926.186 3431.56 3633.41
Kounosu Naka City 926.087 1751.64 3630.67
Funaishikawa Tokai Village 900.399 2324.9 3630.67
Nukada Naka City 899.900 2098.8 3625.2
Uridura Naka City 890.113 2003.4 3625.2
Shiraki Tsuruga City 881.330 4254.91 3633.41
Motokomezaki Naka City 880.851 1862.04 3597.84
Shiraki pass Tsuruga City 850.284 4456.76 3633.41
Radiation dose in Yamamoto 846.633 3586.9
Yoshizawa Mito City 837.646 2027.67 3630.67
Radiation dose at JAEA Oarai (P7) 831.135 3586.9
Mayumi Hitachiota City 828.119 2011.74 3630.67
Urasoko Tsuruga City 826.465 3532.47 3633.41
Nemoto Hitachioomiya City 825.588 2264.82 3627.94
Takenami Mihama Town 804.283 3707.77 3633.41
Radiation dose at JAEA Oarai (P15) 780.207 3586.9
Tateishi Tsuruga City 780.092 2937.55 3633.41
Radiation dose at JAEA Oarai (P14) 770.174 3586.9
Radiation dose at JAEA Oarai (P13) 769.612 3586.9
Ukishima Kawasaki Ward 735.475 6932.16 3633.41
Kume Hitachiota City 713.958 1969.26 3630.67
Radiation dose at JAEA Oarai (P2) 712.011 3586.9
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2249.28 3611.52
Nyuu Mihama Town 674.787 3378.43 3633.41
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2254.39 3619.73
Radiation dose in Iwanuma 670.242 3586.9
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2254.39 3619.73
Tsuruga Tsuruga City 655.360 2980.03 3633.41
Shiohama Kawasaki Ward 653.536 2379.79 3633.41
Radiation dose in Kakuda 649.863 3586.9
Sakajiri Mihama Town 649.252 3941.51 3633.41
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2475.4 3633.41
Radiation dose in Onagawa (MP-2) 632.968 3584.16
Kumatori town Nishi primary school Station 631.491 2958.77 3633.41
Oshima Kawasaki Ward 630.402 2268.23 3633.41
Izumisano municipal Oike athletic field Station 629.920 3335.95 3633.41
Atom-kyoudou nursery school Station 625.566 3203.14 3633.41
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2916.29 3633.41
Nakamachi Omaezaki City 623.494 3755.57 3633.41
Uraga Yokosuka City 622.492 1779.51 3633.41
Goritoge Shika Town 622.143 3989.32 3633.41
Kumatori town Minami primary school Station 606.134 3394.37 3633.41
Radiation dose at JAEA Oarai (P1) 603.643 3589.63
Yamanotedai-No.1 Park Station 599.140 3165.94 3633.41
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3606.05
Noumi Shika Town 594.021 3946.81 3633.41
Radiation dose in Watari 591.851 3586.9
Hairando Yokosuka City 588.667 2231.04 3633.41
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2254.39 3619.73
Ningyotoge Kagamino Town 574.857 3165.94 3633.41
Ten-no Kagamino Town 569.960 3792.77 3633.41
Funagura Yokosuka City 563.909 2103.55 3633.41
Chidori Kawasaki Ward 560.211 2034.49 3633.41
Radiation dose at JAEA Oarai (P16) 556.365 3586.9
Shika Shika Town 551.376 3803.38 3633.41
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2470.08 3633.41
Sahara Yokosuka City 547.404 1970.74 3633.41
Kazanashi Shika Town 545.377 3569.66 3633.41
Akasumi Shika Town 544.970 3266.88 3633.41
Kurahashi Maizuru City 540.820 2974.71 3633.41
Obama Obama City 540.809 2661.31 3633.41
Sakuragaike community hall Omaezaki City 540.772 3851.19 3633.41
Shirowa primary school Omaezaki City 535.692 3771.51 3633.41
Radiation dose at JAEA Oarai (P5) 529.759 3586.9
Uenohara Omaezaki City 529.333 3877.77 3633.41
Kumano Shika Town 529.019 3702.47 3633.41
Izumisano municipal Hineno filtration plant Station 527.471 3192.52 3633.41
Nishi-hamasada Matsue City 525.089 3527.11 3616.99
Kouno Minami-Echizen Town 525.028 2677.25 3633.41
Kurihama Yokosuka City 523.708 2130.1 3633.41
Osaka prefectural Kumatori off-site-center Station 522.808 2942.84 3633.41
Ogasa branch Kikugawa City 522.039 3916.07 3619.73
Izumisano municipal Hineno primary scool Station 518.181 2555.08 3633.41
Shirasuna Omaezaki City 499.479 3798.09 3633.41
Jitougata primary school Makinohara City 498.059 3644.02 3633.41
Kataku Matsue City 497.007 2831.29 3633.41
Nishihemi Yokosuka City 496.917 1699.83 3633.41
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3606.05
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2788.8 3633.41
Otomi Takahama Town 494.821 3123.46 3633.41
Otsu Nanao City 493.895 3134.07 3633.41
The Observation point for comparison Tatsunokuchi 493.454 2581.63 3633.41
Hitsuhama Ohi Town 492.630 2905.67 3633.41
Kijiyama Misasa Town 489.284 2948.16 3633.41
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3606.05
Hiraba Omaezaki City 485.878 3798.09 3633.41
Tayu Matsue City 484.956 2953.48 3633.41
Hamaokakita primary school Omaezaki City 484.537 3889.62 3619.73
Oitomi Ayabe City 474.670 3744.96 3633.41
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3606.05
Kashiwazaki-shigai Kashiwazaki City 470.822 2980.03 3633.41
Mitsu Matsue City 466.897 2825.99 3633.41
Tonomachi Kawasaki Ward 463.967 3580.28 3633.41
Daitou branch Kakegawa City 463.829 3831.42 3619.73
Fukura Shika Town 462.493 3564.34 3633.41
Nagasawa Yokosuka City 462.365 2082.29 3633.41
The athletic field Station of Kinki University 461.661 2353.21 3633.41
Koura Matsue City 461.049 3373.11 3633.41
Sakurasan Ward Omaezaki City 459.434 3675.89 3633.41
Tsuchikawa Nanao City 458.915 3468.73 3633.41
Kumatori Town office Station 457.917 2427.59 3633.41
Shinkango Omaezaki City 449.013 4254.91 3633.41
Ogurui Takahama Town 448.279 2783.48 3633.41
Kusabue Omaezaki City 444.162 4010.55 3633.41
Omaezaki City monitoring center 443.946 3936.19 3633.41
Akawase Kagamino Town 442.246 2427.59 3633.41
Ibaraki 442.139 1780.8 3625.2
Hinode Town Yokosuka City 438.324 1402.37 3633.41
Nishiyama Kashiwazaki City 437.251 4217.72 3633.41
Kariwa Kariwa Village 436.307 3181.88 3633.41
Osaka prefectural Hineno high scool Station 435.745 2836.61 3633.41
Miyagawa Kashiwazaki City 435.245 3139.39 3633.41
Radiation dose in Natori 434.640 3586.9
Kami-koubu Matsue City 433.868 3086.26 3633.41
Shimo-Takamachi Kariwa Village 433.192 3463.43 3633.41
Osaka prefectural Sano supporting school Station 432.398 3091.58 3633.41
Arahama Kashiwazaki City 428.874 3235.01 3633.41
Doai Kashiwazaki City 425.681 3043.78 3633.41
Owashi Matsue City 424.452 3017.23 3633.41
Okayasu Maizuru City 422.568 3553.73 3633.41
Katsuyama Kariwa Village 421.280 3235.01 3633.41
Kita-koubu Matsue City 420.683 3309.37 3633.41
Kichisaka Maizuru City 413.065 4318.66 3633.41
Nagai Ohi Town 410.699 3137.61 3625.2
Shiokumi Maizuru City 407.938 5375.75 3633.41
Miyadome Ohi Town 407.831 2602.89 3633.41
Kariwa Kariwa Village 407.617 3351.88 3633.41
Ueno Satsuma-sendai City 394.248 2432.89 3633.41
Power Station-South 389.191 3543.11 3633.41
Radiation dose at JAEA Oarai (P6) 386.963 3586.9
Power Station- 385.546 3458.11 3633.41
Takae Satsuma-sendai City 379.551 2464.76 3633.41
Hokawaduura Genkai Town 378.015 3752.93 3633.41
Kou Itimatsu Suetsugu 377.929 2709.12 3633.41
Minato Satsuma-sendai City 377.656 2257.59 3633.41
Iwanai Iwanai Town 376.336 3678.44 3630.67
Hattari Kyowa Town 373.047 3577.58 3630.67
Chatsu Tomari Village 371.011 3418.34 3630.67
Oyama Maizuru City 358.223 3112.84 3633.41
Kodaira Satsuma-sendai City 355.545 2284.17 3633.41
Kayanuma Tomari Village 354.809 3041.48 3630.67
Anojiri Obama City 353.215 2549.76 3633.41
Kushi Genkai Town 349.738 5179.2 3633.41
Yamaguchi 348.715 4070.4 3625.2
Sadahongou Matsue City 348.228 3171.26 3633.41
Sakibe Karatsu City 347.801 4908.29 3633.41
Hirao Genkai Town 343.814 5173.88 3633.41
The Meteorological Obsevatory of kyowa Town 343.275 3391.81 3630.67
Minami-Horoni Kyowa Town 335.180 3179.48 3630.67
Kounoura Takahama Town 330.353 2687.86 3633.41
Kyoudomarisaki Karatsu City 328.622 5258.88 3633.41
Horikappu Jinja Tomari Village 328.230 3290.95 3630.67
Hukada-kita Matsue City 327.031 2608.18 3633.41
Radiation dose in KEK, Tsukuba 326.240 3606.05
Herokaruusu Tomari Village 324.242 3413.05 3630.67
Yorita Satsuma-sendai City 323.218 2671.93 3633.41
Kamoenai Kamoenai Village 322.032 2882.24 3630.67
Radiation dose in Onagawa (MP-6) 316.267 3584.16
Imamura Genkai Town 314.749 44567.6 3633.41
Yamanaka Takahama Town 314.185 3468.73 3633.41
Sendai (Miyagi) 312.585 1631.34 3625.2
Radiation dose in Onagawa (MP-1) 300.147 3584.16
Gumisaki Satsuma-sendai City 295.693 2156.68 3633.41
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3606.05
Aomori Aomori City 285.372 2192.19 3630.67
Misawa City hall Misawa City 283.728 4251.71 3630.67
Kashu Ikata Town 277.173 2225.72 3633.41
Noheji Town Office Noheji Town 272.004 1879.03 3630.67
Takasimamati 271.103 2369.14 3633.41
Radiation dose in Onagawa (MP-3) 270.563 3584.16
Kucho Ikata Town 269.545 1965.45 3633.41
Radiation dose in Marumori 269.436 3586.9
Kawanagata Ikata Town 266.821 1917.64 3633.41
Tochigi 260.733 2130.6 3625.2
Chikagawa Mutu City 256.719 2446.98 3630.67
Yokohama Town Office Yokohama Town 254.846 2999.03 3630.67
Tokyo 251.877 2512.2 3625.2
Hiranuma Rokkasho Village 251.186 1969.26 3630.67
Taisei Ikata Town 246.293 1439.56 3633.41
Chitose-daira Rokkasho Village 245.868 2123.21 3630.67
Gifu 243.951 3498 3625.2
Fukkoshi Yokohama Town 243.102 2059.51 3630.67
Shimane 240.651 3498 3625.2
Sunagomata Higashidoori Village 238.012 2977.79 3630.67
Obuchi Rokkasho Village 237.506 2367.36 3630.67
Tomari Rokkasho Village 230.636 3312.19 3630.67
kanagawa 226.339 2194.2 3625.2
Saitama 219.770 1908 3625.2
Ikatagoshi Ikata Town 217.515 1811.38 3633.41
Touhoku Branch office Touhoku Town 215.416 1714.47 3630.67
Radiation dose at Tohoku University 214.824 3586.9
Odanosawa Higashidoori Village 210.287 2372.68 3630.67
Kagawa 205.829 2448.6 3625.2
Oippe Higashidoori Village 205.182 2043.59 3630.67
Oita 200.921 2703 3625.2
Touhoku Town office Touhoku Town 200.811 7930.15 3630.67
Kuchogoshi Ikata Town 198.646 1837.96 3633.41
Minatoura Ikata Town 186.776 1652.02 3633.41
Radiation dose in Koyadori, Ojika 184.905 3581.42
Toyama 184.580 4674.6 3625.2
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2254.39 3619.73
Radiation dose in Tukahama, Ojika 183.417 3581.42
Chiba 182.407 1399.2 3625.2
Nara 182.387 2544 3625.2
Okayama 181.976 3307.2 3625.2
Yamagata 181.598 2607.6 3625.2
Ehime 180.745 2353.2 3625.2
Ishikawa 180.445 4054.5 3625.2
Niigata 177.483 4865.4 3625.2
Hiroshima 176.816 2194.2 3625.2
Mie 174.867 2509.02 3625.2
Fukui 170.045 3084.6 3625.2
Radiation dose in Terama, Ojika 168.036 3581.42
Yamanashi 164.561 2035.2 3625.2
Nagano 162.242 3097.32 3625.2
Saga 161.421 2734.8 3625.2
Tottori 161.392 2512.2 3625.2
Radiation dose in Enoshima, Ojika 160.091 3581.42
Osaka 159.103 1939.8 3625.2
Ibaraki-city Environment 157.249 3540.38
Aichi 149.345 2353.2 3625.2
Toyonoura Ikata Town 149.214 1896.38 3633.41
Shizuoka 148.639 2432.7 3625.2
Kyoto 144.522 2766.6 3625.2
Kagoshima 144.449 2998.74 3625.2
Tokushima 143.627 2130.6 3625.2
Gunma 143.572 1431 3625.2
Hyogo 139.710 2416.8 3625.2
Fukuoka 136.511 2512.2 3625.2
Wakayama 133.857 1780.8 3625.2
Radiation at Tamaki-cho Mie Japan 133.138 3540.38
Akita 132.832 2734.8 3625.2
Shiga 124.919 1939.8 3625.2
Nagasaki 109.459 2194.2 3625.2
Hokkaido 109.189 3339 3625.2
Kumamoto 103.568 2130.6 3625.2
Aomori 101.819 3243.6 3625.2
Miyazaki 100.354 2111.52 3625.2
Kochi 95.931 2416.8 3625.2
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2245.87 3606.05
Iwate 90.324 2671.2 3625.2
Environment Feeds from Ohta 83.623 3540.38
Okinawa 82.305 1828.5 3625.2
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