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Accumulated absorbed dose rate - T=13.03.2011 - 20.04.2014(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 3017.81
Fukushima I MP8 570942.000 3017.81
Fukushima I MP6 240668.000 3017.81
Yamada Futaba Town 176983.000 2160.54 2574.58
Fukushima I MP2 140420.000 3017.81
Fukushima I MP5 111325.000 3017.81
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 1923.82 3088.94
Fukushima I MP3 93730.602 3017.81
Fukushima I MP4 86821.500 3017.81
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 1923.82 3088.94
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 1872.7 3006.86
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 1923.82 3088.94
Ono Okuma Town 38610.500 1994.91 2574.58
Shinzan Futaba Town 38332.801 1810.49 2574.58
Fukushima I MP1 31496.801 3017.81
Yonomori Tomioka Town 29815.900 2062.66 2574.58
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 1923.82 3088.94
Tomioka Tomioka Town 25324.500 2220.75 2574.58
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 1923.82 3088.94
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 1923.82 3088.94
Shimo-Kooriyama Tomioka Town 13057.000 2205.71 2574.58
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 1923.82 3088.94
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 1923.82 3088.94
Kami-kooriyama Tomioka Town 11803.900 1731.45 2574.58
Fukushima II MP3 11060.600 3017.81
Fukushima II MP1 10903.000 3017.81
Kooriyama Futaba Town 10352.900 2017.5 2574.58
Fukushima II MP4 9696.330 3017.81
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 1920.41 3083.47
Fukushima II MP5 9382.150 3017.81
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 1923.82 3088.94
Matsudate Naraha Town 8410.890 2356.26 2574.58
Shigeoka Naraha Town 8115.970 2604.68 2574.58
Fukushima II MP2 7875.320 3017.81
Namie Namie Town 7321.210 1900.83 2574.58
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3034.22
Fukushima II MP6 7062.690 3017.81
Fukushima II MP7 6511.580 3015.07
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 1923.82 3088.94
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 1923.82 3088.94
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 1923.82 3088.94
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 1923.82 3088.94
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 1923.82 3088.94
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 1923.82 3088.94
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 1918.7 3080.74
Futatsunuma Hirono Town 3520.340 2258.4 2574.58
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 1923.82 3088.94
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 1923.82 3088.94
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3031.49
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 1923.82 3088.94
Kiyohashi Namie Town 3162.000 1667.44 2574.58
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 1918.7 3080.74
Radiation dose at Agricultural center, Koriyama 3128.960 3031.49
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 1923.82 3088.94
Radiation dose at Koriyama city office, Koriyama 2803.520 3031.49
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 1923.82 3088.94
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 1918.7 3080.74
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 1923.82 3088.94
Yamadaoka Naraha Town 2205.340 2002.46 2574.58
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3034.22
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 1923.82 3088.94
Kuji Hitachi City 1990.890 4785.79 3099.89
Hitachinaka Hitachinaka City 1951.950 2100.98 3097.15
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 1918.7 3080.74
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 1918.7 3080.74
Momiyama Hokota City 1837.540 2397.44 3099.89
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 1918.7 3080.74
Horiguchi Hitachinaka City 1779.410 2095.63 3102.62
Onuma Hitachi City 1776.950 1784.04 3097.15
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 1923.82 3088.94
Tsukuriya Hokota City 1736.890 2016.75 3099.89
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3031.49
Nemoto Hitachioomiya City 1633.190 2245.9 3097.15
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 1923.82 3088.94
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 1923.82 3088.94
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3039.7
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 1923.82 3088.94
Radiation dose at JAEA Oarai (P12) 1512.140 3056.11
Radiation dose at Ose administration center, Koriyama 1494.270 3031.49
Araji Hokota City 1437.760 2021.26 3099.89
Ishigami Tokai Village 1431.690 1840 3099.89
Mawatari Hitachinaka City 1422.870 2125.52 3099.89
Radiation dose at JAEA Oarai (P11) 1399.370 3056.11
Onuki Oarai Town 1387.990 2207.09 3099.89
Sawa Hitachinaka City 1353.770 1666.29 3097.15
Toyooka Tokai Village 1321.760 2025.8 3099.89
Ajigaura Hitachinaka City 1313.890 1992.31 3097.15
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 1923.82 3088.94
Geiger Counter Feeds from Asao Kawasaki 1266.620 3009.6
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3031.49
Isohama Oarai Town 1250.540 1922.69 3094.42
Ebisawa Ibaraki Town 1222.240 5221.69 3097.15
Muramatsu Tokai Village 1203.520 2043.94 3099.89
Kamitoda Hokota City 1184.740 1676.85 3099.89
Yanagisawa Hitachinaka City 1166.970 1707.05 3097.15
Tokushuku Hokota City 1159.730 1513.7 3099.89
Tasaki Hokota City 1153.300 1781.74 3069.79
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 1923.82 3088.94
Kadobe Naka City 1086.580 4066.15 3097.15
Radiation dose at Date city office, Date 1076.050 3034.22
Oshinobe Tokai Village 1041.340 1907.98 3099.89
Oba Mito City 1037.670 6267.76 3099.89
Godai Naka City 1031.270 1654.17 3099.89
Ishikawa Mito City 1030.810 1950.49 3102.62
Isobe Hitachiota City 1013.130 9408.43 3099.89
Yatabe Ibaraki Town 996.127 1636.06 3099.89
Radiation dose at Motomiya city office, Motomiya 992.703 3034.22
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 1918.7 3080.74
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 1918.7 3080.74
Yokobori Naka City 930.280 1917.04 3099.89
Sugaya Naka City 926.186 2930.27 3102.62
Kounosu Naka City 926.087 1495.56 3099.89
Funaishikawa Tokai Village 900.399 1985.02 3099.89
Nukada Naka City 899.900 1791.5 3094.42
Uridura Naka City 890.113 1710.07 3094.42
Shiraki Tsuruga City 881.330 3633.34 3102.62
Motokomezaki Naka City 880.851 1587.34 3067.06
Shiraki pass Tsuruga City 850.284 3805.7 3102.62
Radiation dose in Yamamoto 846.633 3056.11
Yoshizawa Mito City 837.646 1731.23 3099.89
Radiation dose at JAEA Oarai (P7) 831.135 3056.11
Mayumi Hitachiota City 828.119 1717.64 3099.89
Urasoko Tsuruga City 826.465 3016.43 3102.62
Nemoto Hitachioomiya City 825.588 1933.47 3097.15
Takenami Mihama Town 804.283 3166.12 3102.62
Radiation dose at JAEA Oarai (P15) 780.207 3056.11
Tateishi Tsuruga City 780.092 2508.42 3102.62
Radiation dose at JAEA Oarai (P14) 770.174 3056.11
Radiation dose at JAEA Oarai (P13) 769.612 3056.11
Ukishima Kawasaki Ward 735.475 5919.48 3102.62
Kume Hitachiota City 713.958 1681.36 3099.89
Radiation dose at JAEA Oarai (P2) 712.011 3056.11
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 1918.7 3080.74
Nyuu Mihama Town 674.787 2884.9 3102.62
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 1923.82 3088.94
Radiation dose in Iwanuma 670.242 3056.11
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 1923.82 3088.94
Tsuruga Tsuruga City 655.360 2544.7 3102.62
Shiohama Kawasaki Ward 653.536 2032.14 3102.62
Radiation dose in Kakuda 649.863 3056.11
Sakajiri Mihama Town 649.252 3365.72 3102.62
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2113.78 3102.62
Radiation dose in Onagawa (MP-2) 632.968 3053.38
Kumatori town Nishi primary school Station 631.491 2526.54 3102.62
Oshima Kawasaki Ward 630.402 1936.88 3102.62
Izumisano municipal Oike athletic field Station 629.920 2848.62 3102.62
Atom-kyoudou nursery school Station 625.566 2735.21 3102.62
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2490.26 3102.62
Nakamachi Omaezaki City 623.494 3206.94 3102.62
Uraga Yokosuka City 622.492 1519.55 3102.62
Goritoge Shika Town 622.143 3406.54 3102.62
Kumatori town Minami primary school Station 606.134 2898.5 3102.62
Radiation dose at JAEA Oarai (P1) 603.643 3058.85
Yamanotedai-No.1 Park Station 599.140 2703.45 3102.62
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3075.26
Noumi Shika Town 594.021 3370.24 3102.62
Radiation dose in Watari 591.851 3056.11
Hairando Yokosuka City 588.667 1905.12 3102.62
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 1923.82 3088.94
Ningyotoge Kagamino Town 574.857 2703.45 3102.62
Ten-no Kagamino Town 569.960 3238.7 3102.62
Funagura Yokosuka City 563.909 1796.26 3102.62
Chidori Kawasaki Ward 560.211 1737.28 3102.62
Radiation dose at JAEA Oarai (P16) 556.365 3056.11
Shika Shika Town 551.376 3247.77 3102.62
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2109.24 3102.62
Sahara Yokosuka City 547.404 1682.85 3102.62
Kazanashi Shika Town 545.377 3048.19 3102.62
Akasumi Shika Town 544.970 2789.64 3102.62
Kurahashi Maizuru City 540.820 2540.15 3102.62
Obama Obama City 540.809 2272.54 3102.62
Sakuragaike community hall Omaezaki City 540.772 3288.59 3102.62
Shirowa primary school Omaezaki City 535.692 3220.55 3102.62
Radiation dose at JAEA Oarai (P5) 529.759 3056.11
Uenohara Omaezaki City 529.333 3311.29 3102.62
Kumano Shika Town 529.019 3161.6 3102.62
Izumisano municipal Hineno filtration plant Station 527.471 2726.15 3102.62
Nishi-hamasada Matsue City 525.089 3009.51 3086.21
Kouno Minami-Echizen Town 525.028 2286.14 3102.62
Kurihama Yokosuka City 523.708 1818.93 3102.62
Osaka prefectural Kumatori off-site-center Station 522.808 2512.93 3102.62
Ogasa branch Kikugawa City 522.039 3341.83 3088.94
Izumisano municipal Hineno primary scool Station 518.181 2181.83 3102.62
Shirasuna Omaezaki City 499.479 3243.25 3102.62
Jitougata primary school Makinohara City 498.059 3111.69 3102.62
Kataku Matsue City 497.007 2417.68 3102.62
Nishihemi Yokosuka City 496.917 1451.51 3102.62
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3075.26
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2381.4 3102.62
Otomi Takahama Town 494.821 2667.17 3102.62
Otsu Nanao City 493.895 2676.23 3102.62
The Observation point for comparison Tatsunokuchi 493.454 2204.5 3102.62
Hitsuhama Ohi Town 492.630 2481.2 3102.62
Kijiyama Misasa Town 489.284 2517.48 3102.62
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3075.26
Hiraba Omaezaki City 485.878 3243.25 3102.62
Tayu Matsue City 484.956 2522.03 3102.62
Hamaokakita primary school Omaezaki City 484.537 3319.26 3088.94
Oitomi Ayabe City 474.670 3197.88 3102.62
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3075.26
Kashiwazaki-shigai Kashiwazaki City 470.822 2544.7 3102.62
Mitsu Matsue City 466.897 2413.16 3102.62
Tonomachi Kawasaki Ward 463.967 3057.25 3102.62
Daitou branch Kakegawa City 463.829 3269.59 3088.94
Fukura Shika Town 462.493 3043.65 3102.62
Nagasawa Yokosuka City 462.365 1778.1 3102.62
The athletic field Station of Kinki University 461.661 2009.44 3102.62
Koura Matsue City 461.049 2880.35 3102.62
Sakurasan Ward Omaezaki City 459.434 3138.9 3102.62
Tsuchikawa Nanao City 458.915 2962 3102.62
Kumatori Town office Station 457.917 2072.96 3102.62
Shinkango Omaezaki City 449.013 3633.34 3102.62
Ogurui Takahama Town 448.279 2376.85 3102.62
Kusabue Omaezaki City 444.162 3424.67 3102.62
Omaezaki City monitoring center 443.946 3361.18 3102.62
Akawase Kagamino Town 442.246 2072.96 3102.62
Ibaraki 442.139 1520.06 3094.42
Hinode Town Yokosuka City 438.324 1197.5 3102.62
Nishiyama Kashiwazaki City 437.251 3601.57 3102.62
Kariwa Kariwa Village 436.307 2717.05 3102.62
Osaka prefectural Hineno high scool Station 435.745 2422.22 3102.62
Miyagawa Kashiwazaki City 435.245 2680.78 3102.62
Radiation dose in Natori 434.640 3056.11
Kami-koubu Matsue City 433.868 2635.41 3102.62
Shimo-Takamachi Kariwa Village 433.192 2957.48 3102.62
Osaka prefectural Sano supporting school Station 432.398 2639.95 3102.62
Arahama Kashiwazaki City 428.874 2762.42 3102.62
Doai Kashiwazaki City 425.681 2599.13 3102.62
Owashi Matsue City 424.452 2576.46 3102.62
Okayasu Maizuru City 422.568 3034.58 3102.62
Katsuyama Kariwa Village 421.280 2762.42 3102.62
Kita-koubu Matsue City 420.683 2825.92 3102.62
Kichisaka Maizuru City 413.065 3687.77 3102.62
Nagai Ohi Town 410.699 2678.22 3094.42
Shiokumi Maizuru City 407.938 4590.44 3102.62
Miyadome Ohi Town 407.831 2222.65 3102.62
Kariwa Kariwa Village 407.617 2862.23 3102.62
Ueno Satsuma-sendai City 394.248 2077.48 3102.62
Power Station-South 389.191 3025.52 3102.62
Radiation dose at JAEA Oarai (P6) 386.963 3056.11
Power Station- 385.546 2952.94 3102.62
Takae Satsuma-sendai City 379.551 2104.7 3102.62
Hokawaduura Genkai Town 378.015 3204.68 3102.62
Kou Itimatsu Suetsugu 377.929 2313.36 3102.62
Minato Satsuma-sendai City 377.656 1927.79 3102.62
Iwanai Iwanai Town 376.336 3140.68 3099.89
Hattari Kyowa Town 373.047 3054.56 3099.89
Chatsu Tomari Village 371.011 2918.6 3099.89
Oyama Maizuru City 358.223 2658.11 3102.62
Kodaira Satsuma-sendai City 355.545 1950.49 3102.62
Kayanuma Tomari Village 354.809 2596.84 3099.89
Anojiri Obama City 353.215 2177.28 3102.62
Kushi Genkai Town 349.738 4422.6 3102.62
Yamaguchi 348.715 3474.43 3094.42
Sadahongou Matsue City 348.228 2707.99 3102.62
Sakibe Karatsu City 347.801 4191.26 3102.62
Hirao Genkai Town 343.814 4418.05 3102.62
The Meteorological Obsevatory of kyowa Town 343.275 2895.95 3099.89
Minami-Horoni Kyowa Town 335.180 2714.66 3099.89
Kounoura Takahama Town 330.353 2295.21 3102.62
Kyoudomarisaki Karatsu City 328.622 4490.64 3102.62
Horikappu Jinja Tomari Village 328.230 2809.83 3099.89
Hukada-kita Matsue City 327.031 2227.17 3102.62
Radiation dose in KEK, Tsukuba 326.240 3075.26
Herokaruusu Tomari Village 324.242 2914.08 3099.89
Yorita Satsuma-sendai City 323.218 2281.6 3102.62
Kamoenai Kamoenai Village 322.032 2460.88 3099.89
Radiation dose in Onagawa (MP-6) 316.267 3053.38
Imamura Genkai Town 314.749 38056.9 3102.62
Yamanaka Takahama Town 314.185 2962 3102.62
Sendai (Miyagi) 312.585 1392.49 3094.42
Radiation dose in Onagawa (MP-1) 300.147 3053.38
Gumisaki Satsuma-sendai City 295.693 1841.63 3102.62
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3075.26
Aomori Aomori City 285.372 1871.71 3099.89
Misawa City hall Misawa City 283.728 3630.13 3099.89
Kashu Ikata Town 277.173 1900.57 3102.62
Noheji Town Office Noheji Town 272.004 1604.33 3099.89
Takasimamati 271.103 2023.05 3102.62
Radiation dose in Onagawa (MP-3) 270.563 3053.38
Kucho Ikata Town 269.545 1678.33 3102.62
Radiation dose in Marumori 269.436 3056.11
Kawanagata Ikata Town 266.821 1637.51 3102.62
Tochigi 260.733 1818.65 3094.42
Chikagawa Mutu City 256.719 2089.24 3099.89
Yokohama Town Office Yokohama Town 254.846 2560.59 3099.89
Tokyo 251.877 2144.38 3094.42
Hiranuma Rokkasho Village 251.186 1681.36 3099.89
Taisei Ikata Town 246.293 1229.27 3102.62
Chitose-daira Rokkasho Village 245.868 1812.81 3099.89
Gifu 243.951 2985.84 3094.42
Fukkoshi Yokohama Town 243.102 1758.43 3099.89
Shimane 240.651 2985.84 3094.42
Sunagomata Higashidoori Village 238.012 2542.45 3099.89
Obuchi Rokkasho Village 237.506 2021.26 3099.89
Tomari Rokkasho Village 230.636 2827.97 3099.89
kanagawa 226.339 1872.94 3094.42
Saitama 219.770 1628.64 3094.42
Ikatagoshi Ikata Town 217.515 1546.77 3102.62
Touhoku Branch office Touhoku Town 215.416 1463.83 3099.89
Radiation dose at Tohoku University 214.824 3056.11
Odanosawa Higashidoori Village 210.287 2025.8 3099.89
Kagawa 205.829 2090.09 3094.42
Oippe Higashidoori Village 205.182 1744.83 3099.89
Oita 200.921 2307.24 3094.42
Touhoku Town office Touhoku Town 200.811 6770.81 3099.89
Kuchogoshi Ikata Town 198.646 1569.47 3102.62
Minatoura Ikata Town 186.776 1410.69 3102.62
Radiation dose in Koyadori, Ojika 184.905 3050.64
Toyama 184.580 3990.17 3094.42
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 1923.82 3088.94
Radiation dose in Tukahama, Ojika 183.417 3050.64
Chiba 182.407 1194.34 3094.42
Nara 182.387 2171.52 3094.42
Okayama 181.976 2822.98 3094.42
Yamagata 181.598 2225.81 3094.42
Ehime 180.745 2008.66 3094.42
Ishikawa 180.445 3460.86 3094.42
Niigata 177.483 4153.03 3094.42
Hiroshima 176.816 1872.94 3094.42
Mie 174.867 2141.66 3094.42
Fukui 170.045 2632.97 3094.42
Radiation dose in Terama, Ojika 168.036 3050.64
Yamanashi 164.561 1737.22 3094.42
Nagano 162.242 2643.83 3094.42
Saga 161.421 2334.38 3094.42
Tottori 161.392 2144.38 3094.42
Radiation dose in Enoshima, Ojika 160.091 3050.64
Osaka 159.103 1655.78 3094.42
Ibaraki-city Environment 157.249 3009.6
Aichi 149.345 2008.66 3094.42
Toyonoura Ikata Town 149.214 1619.35 3102.62
Shizuoka 148.639 2076.52 3094.42
Kyoto 144.522 2361.53 3094.42
Kagoshima 144.449 2559.68 3094.42
Tokushima 143.627 1818.65 3094.42
Gunma 143.572 1221.48 3094.42
Hyogo 139.710 2062.94 3094.42
Fukuoka 136.511 2144.38 3094.42
Wakayama 133.857 1520.06 3094.42
Radiation at Tamaki-cho Mie Japan 133.138 3009.6
Akita 132.832 2334.38 3094.42
Shiga 124.919 1655.78 3094.42
Nagasaki 109.459 1872.94 3094.42
Hokkaido 109.189 2850.12 3094.42
Kumamoto 103.568 1818.65 3094.42
Aomori 101.819 2768.69 3094.42
Miyazaki 100.354 1802.36 3094.42
Kochi 95.931 2062.94 3094.42
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 1915.3 3075.26
Iwate 90.324 2280.1 3094.42
Environment Feeds from Ohta 83.623 3009.6
Okinawa 82.305 1560.78 3094.42
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