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Accumulated absorbed dose rate - T=13.03.2011 - 22.05.2015(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 4104
Fukushima I MP8 570942.000 4104
Fukushima I MP6 240668.000 4104
Yamada Futaba Town 176983.000 3072.06 3660.77
Fukushima I MP2 140420.000 4104
Fukushima I MP5 111325.000 4104
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2600.3 4175.14
Fukushima I MP3 93730.602 4104
Fukushima I MP4 86821.500 4104
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2600.3 4175.14
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2549.18 4093.06
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2600.3 4175.14
Ono Okuma Town 38610.500 2836.55 3660.77
Shinzan Futaba Town 38332.801 2574.32 3660.77
Fukushima I MP1 31496.801 4104
Yonomori Tomioka Town 29815.900 2932.89 3660.77
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2600.3 4175.14
Tomioka Tomioka Town 25324.500 3157.67 3660.77
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2600.3 4175.14
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2600.3 4175.14
Shimo-Kooriyama Tomioka Town 13057.000 3136.28 3660.77
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2600.3 4175.14
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2600.3 4175.14
Kami-kooriyama Tomioka Town 11803.900 2461.93 3660.77
Fukushima II MP3 11060.600 4104
Fukushima II MP1 10903.000 4104
Kooriyama Futaba Town 10352.900 2868.66 3660.77
Fukushima II MP4 9696.330 4104
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2596.9 4169.66
Fukushima II MP5 9382.150 4104
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2600.3 4175.14
Matsudate Naraha Town 8410.890 3350.34 3660.77
Shigeoka Naraha Town 8115.970 3703.57 3660.77
Fukushima II MP2 7875.320 4104
Namie Namie Town 7321.210 2702.77 3660.77
Radiation dose at Shirasawa branch office, Motomiya 7287.920 4120.42
Fukushima II MP6 7062.690 4104
Fukushima II MP7 6511.580 4101.26
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2600.3 4175.14
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2600.3 4175.14
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2600.3 4175.14
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2600.3 4175.14
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2600.3 4175.14
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2600.3 4175.14
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2595.19 4166.93
Futatsunuma Hirono Town 3520.340 3211.2 3660.77
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2600.3 4175.14
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2600.3 4175.14
Radiation dose at Koriyama joint government building, Koriyama 3232.890 4117.68
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2600.3 4175.14
Kiyohashi Namie Town 3162.000 2370.93 3660.77
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2595.19 4166.93
Radiation dose at Agricultural center, Koriyama 3128.960 4117.68
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2600.3 4175.14
Radiation dose at Koriyama city office, Koriyama 2803.520 4117.68
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2600.3 4175.14
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2595.19 4166.93
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2600.3 4175.14
Yamadaoka Naraha Town 2205.340 2847.27 3660.77
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 4120.42
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2600.3 4175.14
Kuji Hitachi City 1990.890 6462.72 4186.08
Hitachinaka Hitachinaka City 1951.950 2837.81 4183.34
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2595.19 4166.93
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2595.19 4166.93
Momiyama Hokota City 1837.540 3237.49 4186.08
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2595.19 4166.93
Horiguchi Hitachinaka City 1779.410 2829.29 4188.82
Onuma Hitachi City 1776.950 2409.72 4183.34
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2600.3 4175.14
Tsukuriya Hokota City 1736.890 2723.41 4186.08
Radiation dose at Big palette Fukushima, Koriyama 1668.540 4117.68
Nemoto Hitachioomiya City 1633.190 3033.55 4183.34
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2600.3 4175.14
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2600.3 4175.14
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 4125.89
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2600.3 4175.14
Radiation dose at JAEA Oarai (P12) 1512.140 4142.3
Radiation dose at Ose administration center, Koriyama 1494.270 4117.68
Araji Hokota City 1437.760 2729.51 4186.08
Ishigami Tokai Village 1431.690 2484.73 4186.08
Mawatari Hitachinaka City 1422.870 2870.29 4186.08
Radiation dose at JAEA Oarai (P11) 1399.370 4142.3
Onuki Oarai Town 1387.990 2980.45 4186.08
Sawa Hitachinaka City 1353.770 2250.68 4183.34
Toyooka Tokai Village 1321.760 2735.64 4186.08
Ajigaura Hitachinaka City 1313.890 2691.03 4183.34
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2600.3 4175.14
Geiger Counter Feeds from Asao Kawasaki 1266.620 4095.79
Radiation dose at Tamokami elementary school, Koriyama 1256.140 4117.68
Isohama Oarai Town 1250.540 2597.59 4180.61
Ebisawa Ibaraki Town 1222.240 7052.97 4183.34
Muramatsu Tokai Village 1203.520 2760.13 4186.08
Kamitoda Hokota City 1184.740 2264.41 4186.08
Yanagisawa Hitachinaka City 1166.970 2305.72 4183.34
Tokushuku Hokota City 1159.730 2044.09 4186.08
Tasaki Hokota City 1153.300 2412.18 4155.98
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2600.3 4175.14
Kadobe Naka City 1086.580 5492.18 4183.34
Radiation dose at Date city office, Date 1076.050 4120.42
Oshinobe Tokai Village 1041.340 2576.53 4186.08
Oba Mito City 1037.670 8463.96 4186.08
Godai Naka City 1031.270 2233.79 4186.08
Ishikawa Mito City 1030.810 2633.33 4188.82
Isobe Hitachiota City 1013.130 12705.1 4186.08
Yatabe Ibaraki Town 996.127 2209.33 4186.08
Radiation dose at Motomiya city office, Motomiya 992.703 4120.42
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2595.19 4166.93
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2595.19 4166.93
Yokobori Naka City 930.280 2588.76 4186.08
Sugaya Naka City 926.186 3956.12 4188.82
Kounosu Naka City 926.087 2019.6 4186.08
Funaishikawa Tokai Village 900.399 2680.56 4186.08
Nukada Naka City 899.900 2420.35 4180.61
Uridura Naka City 890.113 2310.34 4180.61
Shiraki Tsuruga City 881.330 4905.32 4188.82
Motokomezaki Naka City 880.851 2149.49 4153.25
Shiraki pass Tsuruga City 850.284 5138.02 4188.82
Radiation dose in Yamamoto 846.633 4142.3
Yoshizawa Mito City 837.646 2337.85 4186.08
Radiation dose at JAEA Oarai (P7) 831.135 4142.3
Mayumi Hitachiota City 828.119 2319.49 4186.08
Urasoko Tsuruga City 826.465 4072.45 4188.82
Nemoto Hitachioomiya City 825.588 2611.54 4183.34
Takenami Mihama Town 804.283 4274.54 4188.82
Radiation dose at JAEA Oarai (P15) 780.207 4142.3
Tateishi Tsuruga City 780.092 3386.58 4188.82
Radiation dose at JAEA Oarai (P14) 770.174 4142.3
Radiation dose at JAEA Oarai (P13) 769.612 4142.3
Ukishima Kawasaki Ward 735.475 7991.82 4188.82
Kume Hitachiota City 713.958 2270.51 4186.08
Radiation dose at JAEA Oarai (P2) 712.011 4142.3
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2595.19 4166.93
Nyuu Mihama Town 674.787 3894.86 4188.82
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2600.3 4175.14
Radiation dose in Iwanuma 670.242 4142.3
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2600.3 4175.14
Tsuruga Tsuruga City 655.360 3435.56 4188.82
Shiohama Kawasaki Ward 653.536 2743.56 4188.82
Radiation dose in Kakuda 649.863 4142.3
Sakajiri Mihama Town 649.252 4544.02 4188.82
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2853.8 4188.82
Radiation dose in Onagawa (MP-2) 632.968 4139.57
Kumatori town Nishi primary school Station 631.491 3411.06 4188.82
Oshima Kawasaki Ward 630.402 2614.96 4188.82
Izumisano municipal Oike athletic field Station 629.920 3845.88 4188.82
Atom-kyoudou nursery school Station 625.566 3692.77 4188.82
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3362.08 4188.82
Nakamachi Omaezaki City 623.494 4329.66 4188.82
Uraga Yokosuka City 622.492 2051.53 4188.82
Goritoge Shika Town 622.143 4599.14 4188.82
Kumatori town Minami primary school Station 606.134 3913.24 4188.82
Radiation dose at JAEA Oarai (P1) 603.643 4145.04
Yamanotedai-No.1 Park Station 599.140 3649.89 4188.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4161.46
Noumi Shika Town 594.021 4550.12 4188.82
Radiation dose in Watari 591.851 4142.3
Hairando Yokosuka City 588.667 2572.08 4188.82
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2600.3 4175.14
Ningyotoge Kagamino Town 574.857 3649.89 4188.82
Ten-no Kagamino Town 569.960 4372.54 4188.82
Funagura Yokosuka City 563.909 2425.1 4188.82
Chidori Kawasaki Ward 560.211 2345.48 4188.82
Radiation dose at JAEA Oarai (P16) 556.365 4142.3
Shika Shika Town 551.376 4384.77 4188.82
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2847.66 4188.82
Sahara Yokosuka City 547.404 2271.99 4188.82
Kazanashi Shika Town 545.377 4115.33 4188.82
Akasumi Shika Town 544.970 3766.26 4188.82
Kurahashi Maizuru City 540.820 3429.43 4188.82
Obama Obama City 540.809 3068.12 4188.82
Sakuragaike community hall Omaezaki City 540.772 4439.89 4188.82
Shirowa primary school Omaezaki City 535.692 4348.03 4188.82
Radiation dose at JAEA Oarai (P5) 529.759 4142.3
Uenohara Omaezaki City 529.333 4470.53 4188.82
Kumano Shika Town 529.019 4268.44 4188.82
Izumisano municipal Hineno filtration plant Station 527.471 3680.54 4188.82
Nishi-hamasada Matsue City 525.089 4068.71 4172.4
Kouno Minami-Echizen Town 525.028 3086.5 4188.82
Kurihama Yokosuka City 523.708 2455.71 4188.82
Osaka prefectural Kumatori off-site-center Station 522.808 3392.68 4188.82
Ogasa branch Kikugawa City 522.039 4516.95 4175.14
Izumisano municipal Hineno primary scool Station 518.181 2945.66 4188.82
Shirasuna Omaezaki City 499.479 4378.67 4188.82
Jitougata primary school Makinohara City 498.059 4201.05 4188.82
Kataku Matsue City 497.007 3264.08 4188.82
Nishihemi Yokosuka City 496.917 1959.67 4188.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4161.46
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3215.1 4188.82
Otomi Takahama Town 494.821 3600.91 4188.82
Otsu Nanao City 493.895 3613.15 4188.82
The Observation point for comparison Tatsunokuchi 493.454 2976.26 4188.82
Hitsuhama Ohi Town 492.630 3349.84 4188.82
Kijiyama Misasa Town 489.284 3398.82 4188.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4161.46
Hiraba Omaezaki City 485.878 4378.67 4188.82
Tayu Matsue City 484.956 3404.96 4188.82
Hamaokakita primary school Omaezaki City 484.537 4486.44 4175.14
Oitomi Ayabe City 474.670 4317.42 4188.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4161.46
Kashiwazaki-shigai Kashiwazaki City 470.822 3435.56 4188.82
Mitsu Matsue City 466.897 3257.98 4188.82
Tonomachi Kawasaki Ward 463.967 4127.56 4188.82
Daitou branch Kakegawa City 463.829 4419.31 4175.14
Fukura Shika Town 462.493 4109.19 4188.82
Nagasawa Yokosuka City 462.365 2400.6 4188.82
The athletic field Station of Kinki University 461.661 2712.92 4188.82
Koura Matsue City 461.049 3888.73 4188.82
Sakurasan Ward Omaezaki City 459.434 4237.8 4188.82
Tsuchikawa Nanao City 458.915 3998.96 4188.82
Kumatori Town office Station 457.917 2798.68 4188.82
Shinkango Omaezaki City 449.013 4905.32 4188.82
Ogurui Takahama Town 448.279 3208.96 4188.82
Kusabue Omaezaki City 444.162 4623.61 4188.82
Omaezaki City monitoring center 443.946 4537.88 4188.82
Akawase Kagamino Town 442.246 2798.68 4188.82
Ibaraki 442.139 2053.63 4180.61
Hinode Town Yokosuka City 438.324 1616.74 4188.82
Nishiyama Kashiwazaki City 437.251 4862.44 4188.82
Kariwa Kariwa Village 436.307 3668.26 4188.82
Osaka prefectural Hineno high scool Station 435.745 3270.22 4188.82
Miyagawa Kashiwazaki City 435.245 3619.28 4188.82
Radiation dose in Natori 434.640 4142.3
Kami-koubu Matsue City 433.868 3558.03 4188.82
Shimo-Takamachi Kariwa Village 433.192 3992.86 4188.82
Osaka prefectural Sano supporting school Station 432.398 3564.17 4188.82
Arahama Kashiwazaki City 428.874 3729.52 4188.82
Doai Kashiwazaki City 425.681 3509.05 4188.82
Owashi Matsue City 424.452 3478.44 4188.82
Okayasu Maizuru City 422.568 4096.96 4188.82
Katsuyama Kariwa Village 421.280 3729.52 4188.82
Kita-koubu Matsue City 420.683 3815.24 4188.82
Kichisaka Maizuru City 413.065 4978.81 4188.82
Nagai Ohi Town 410.699 3618.32 4180.61
Shiokumi Maizuru City 407.938 6197.5 4188.82
Miyadome Ohi Town 407.831 3000.77 4188.82
Kariwa Kariwa Village 407.617 3864.26 4188.82
Ueno Satsuma-sendai City 394.248 2804.78 4188.82
Power Station-South 389.191 4084.72 4188.82
Radiation dose at JAEA Oarai (P6) 386.963 4142.3
Power Station- 385.546 3986.72 4188.82
Takae Satsuma-sendai City 379.551 2841.52 4188.82
Hokawaduura Genkai Town 378.015 4326.61 4188.82
Kou Itimatsu Suetsugu 377.929 3123.24 4188.82
Minato Satsuma-sendai City 377.656 2602.69 4188.82
Iwanai Iwanai Town 376.336 4241.16 4186.08
Hattari Kyowa Town 373.047 4124.87 4186.08
Chatsu Tomari Village 371.011 3941.27 4186.08
Oyama Maizuru City 358.223 3588.68 4188.82
Kodaira Satsuma-sendai City 355.545 2633.33 4188.82
Kayanuma Tomari Village 354.809 3506.76 4186.08
Anojiri Obama City 353.215 2939.52 4188.82
Kushi Genkai Town 349.738 5970.9 4188.82
Yamaguchi 348.715 4694.02 4180.61
Sadahongou Matsue City 348.228 3656.03 4188.82
Sakibe Karatsu City 347.801 5658.58 4188.82
Hirao Genkai Town 343.814 5964.76 4188.82
The Meteorological Obsevatory of kyowa Town 343.275 3910.68 4186.08
Minami-Horoni Kyowa Town 335.180 3665.87 4186.08
Kounoura Takahama Town 330.353 3098.73 4188.82
Kyoudomarisaki Karatsu City 328.622 6062.76 4188.82
Horikappu Jinja Tomari Village 328.230 3794.39 4186.08
Hukada-kita Matsue City 327.031 3006.87 4188.82
Radiation dose in KEK, Tsukuba 326.240 4161.46
Herokaruusu Tomari Village 324.242 3935.17 4186.08
Yorita Satsuma-sendai City 323.218 3080.36 4188.82
Kamoenai Kamoenai Village 322.032 3323.16 4186.08
Radiation dose in Onagawa (MP-6) 316.267 4139.57
Imamura Genkai Town 314.749 51380.2 4188.82
Yamanaka Takahama Town 314.185 3998.96 4188.82
Sendai (Miyagi) 312.585 1881.27 4180.61
Radiation dose in Onagawa (MP-1) 300.147 4139.57
Gumisaki Satsuma-sendai City 295.693 2486.36 4188.82
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4161.46
Aomori Aomori City 285.372 2527.55 4186.08
Misawa City hall Misawa City 283.728 4902.12 4186.08
Kashu Ikata Town 277.173 2565.94 4188.82
Noheji Town Office Noheji Town 272.004 2166.48 4186.08
Takasimamati 271.103 2731.29 4188.82
Radiation dose in Onagawa (MP-3) 270.563 4139.57
Kucho Ikata Town 269.545 2265.89 4188.82
Radiation dose in Marumori 269.436 4142.3
Kawanagata Ikata Town 266.821 2210.78 4188.82
Tochigi 260.733 2457.02 4180.61
Chikagawa Mutu City 256.719 2821.31 4186.08
Yokohama Town Office Yokohama Town 254.846 3457.81 4186.08
Tokyo 251.877 2897.09 4180.61
Hiranuma Rokkasho Village 251.186 2270.51 4186.08
Taisei Ikata Town 246.293 1659.62 4188.82
Chitose-daira Rokkasho Village 245.868 2448.01 4186.08
Gifu 243.951 4033.92 4180.61
Fukkoshi Yokohama Town 243.102 2374.57 4186.08
Shimane 240.651 4033.92 4180.61
Sunagomata Higashidoori Village 238.012 3433.32 4186.08
Obuchi Rokkasho Village 237.506 2729.51 4186.08
Tomari Rokkasho Village 230.636 3818.88 4186.08
kanagawa 226.339 2530.37 4180.61
Saitama 219.770 2200.32 4180.61
Ikatagoshi Ikata Town 217.515 2088.27 4188.82
Touhoku Branch office Touhoku Town 215.416 1976.75 4186.08
Radiation dose at Tohoku University 214.824 4142.3
Odanosawa Higashidoori Village 210.287 2735.64 4186.08
Kagawa 205.829 2823.74 4180.61
Oippe Higashidoori Village 205.182 2356.21 4186.08
Oita 200.921 3117.12 4180.61
Touhoku Town office Touhoku Town 200.811 9143.28 4186.08
Kuchogoshi Ikata Town 198.646 2118.92 4188.82
Minatoura Ikata Town 186.776 1904.55 4188.82
Radiation dose in Koyadori, Ojika 184.905 4136.83
Toyama 184.580 5390.78 4180.61
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2600.3 4175.14
Radiation dose in Tukahama, Ojika 183.417 4136.83
Chiba 182.407 1613.57 4180.61
Nara 182.387 2933.76 4180.61
Okayama 181.976 3813.89 4180.61
Yamagata 181.598 3007.1 4180.61
Ehime 180.745 2713.73 4180.61
Ishikawa 180.445 4675.68 4180.61
Niigata 177.483 5610.82 4180.61
Hiroshima 176.816 2530.37 4180.61
Mie 174.867 2893.42 4180.61
Fukui 170.045 3557.18 4180.61
Radiation dose in Terama, Ojika 168.036 4136.83
Yamanashi 164.561 2347.01 4180.61
Nagano 162.242 3571.85 4180.61
Saga 161.421 3153.79 4180.61
Tottori 161.392 2897.09 4180.61
Radiation dose in Enoshima, Ojika 160.091 4136.83
Osaka 159.103 2236.99 4180.61
Ibaraki-city Environment 157.249 4095.79
Aichi 149.345 2713.73 4180.61
Toyonoura Ikata Town 149.214 2186.27 4188.82
Shizuoka 148.639 2805.41 4180.61
Kyoto 144.522 3190.46 4180.61
Kagoshima 144.449 3458.17 4180.61
Tokushima 143.627 2457.02 4180.61
Gunma 143.572 1650.24 4180.61
Hyogo 139.710 2787.07 4180.61
Fukuoka 136.511 2897.09 4180.61
Wakayama 133.857 2053.63 4180.61
Radiation at Tamaki-cho Mie Japan 133.138 4095.79
Akita 132.832 3153.79 4180.61
Shiga 124.919 2236.99 4180.61
Nagasaki 109.459 2530.37 4180.61
Hokkaido 109.189 3850.56 4180.61
Kumamoto 103.568 2457.02 4180.61
Aomori 101.819 3740.54 4180.61
Miyazaki 100.354 2435.02 4180.61
Kochi 95.931 2787.07 4180.61
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2591.78 4161.46
Iwate 90.324 3080.45 4180.61
Environment Feeds from Ohta 83.623 4095.79
Okinawa 82.305 2108.64 4180.61
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