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Accumulated absorbed dose rate - T=13.03.2011 - 30.03.2015(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 3958.99
Fukushima I MP8 570942.000 3958.99
Fukushima I MP6 240668.000 3958.99
Yamada Futaba Town 176983.000 2950.37 3515.76
Fukushima I MP2 140420.000 3958.99
Fukushima I MP5 111325.000 3958.99
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2509.99 4030.13
Fukushima I MP3 93730.602 3958.99
Fukushima I MP4 86821.500 3958.99
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2509.99 4030.13
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2458.87 3948.05
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2509.99 4030.13
Ono Okuma Town 38610.500 2724.19 3515.76
Shinzan Futaba Town 38332.801 2472.35 3515.76
Fukushima I MP1 31496.801 3958.99
Yonomori Tomioka Town 29815.900 2816.71 3515.76
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2509.99 4030.13
Tomioka Tomioka Town 25324.500 3032.59 3515.76
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2509.99 4030.13
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2509.99 4030.13
Shimo-Kooriyama Tomioka Town 13057.000 3012.05 3515.76
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2509.99 4030.13
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2509.99 4030.13
Kami-kooriyama Tomioka Town 11803.900 2364.41 3515.76
Fukushima II MP3 11060.600 3958.99
Fukushima II MP1 10903.000 3958.99
Kooriyama Futaba Town 10352.900 2755.03 3515.76
Fukushima II MP4 9696.330 3958.99
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2506.58 4024.66
Fukushima II MP5 9382.150 3958.99
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2509.99 4030.13
Matsudate Naraha Town 8410.890 3217.63 3515.76
Shigeoka Naraha Town 8115.970 3556.87 3515.76
Fukushima II MP2 7875.320 3958.99
Namie Namie Town 7321.210 2595.71 3515.76
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3975.41
Fukushima II MP6 7062.690 3958.99
Fukushima II MP7 6511.580 3956.26
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2509.99 4030.13
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2509.99 4030.13
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2509.99 4030.13
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2509.99 4030.13
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2509.99 4030.13
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2509.99 4030.13
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2504.88 4021.92
Futatsunuma Hirono Town 3520.340 3084 3515.76
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2509.99 4030.13
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2509.99 4030.13
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3972.67
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2509.99 4030.13
Kiyohashi Namie Town 3162.000 2277.01 3515.76
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2504.88 4021.92
Radiation dose at Agricultural center, Koriyama 3128.960 3972.67
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2509.99 4030.13
Radiation dose at Koriyama city office, Koriyama 2803.520 3972.67
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2509.99 4030.13
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2504.88 4021.92
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2509.99 4030.13
Yamadaoka Naraha Town 2205.340 2734.49 3515.76
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3975.41
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2509.99 4030.13
Kuji Hitachi City 1990.890 6238.85 4041.07
Hitachinaka Hitachinaka City 1951.950 2739.44 4038.34
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2504.88 4021.92
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2504.88 4021.92
Momiyama Hokota City 1837.540 3125.34 4041.07
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2504.88 4021.92
Horiguchi Hitachinaka City 1779.410 2731.34 4043.81
Onuma Hitachi City 1776.950 2326.19 4038.34
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2509.99 4030.13
Tsukuriya Hokota City 1736.890 2629.07 4041.07
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3972.67
Nemoto Hitachioomiya City 1633.190 2928.4 4038.34
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2509.99 4030.13
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2509.99 4030.13
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3980.88
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2509.99 4030.13
Radiation dose at JAEA Oarai (P12) 1512.140 3997.3
Radiation dose at Ose administration center, Koriyama 1494.270 3972.67
Araji Hokota City 1437.760 2634.96 4041.07
Ishigami Tokai Village 1431.690 2398.66 4041.07
Mawatari Hitachinaka City 1422.870 2770.86 4041.07
Radiation dose at JAEA Oarai (P11) 1399.370 3997.3
Onuki Oarai Town 1387.990 2877.21 4041.07
Sawa Hitachinaka City 1353.770 2172.66 4038.34
Toyooka Tokai Village 1321.760 2640.88 4041.07
Ajigaura Hitachinaka City 1313.890 2597.75 4038.34
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2509.99 4030.13
Geiger Counter Feeds from Asao Kawasaki 1266.620 3950.78
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3972.67
Isohama Oarai Town 1250.540 2507.49 4035.6
Ebisawa Ibaraki Town 1222.240 6808.49 4038.34
Muramatsu Tokai Village 1203.520 2664.52 4041.07
Kamitoda Hokota City 1184.740 2185.97 4041.07
Yanagisawa Hitachinaka City 1166.970 2225.8 4038.34
Tokushuku Hokota City 1159.730 1973.28 4041.07
Tasaki Hokota City 1153.300 2328.02 4010.98
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2509.99 4030.13
Kadobe Naka City 1086.580 5301.8 4038.34
Radiation dose at Date city office, Date 1076.050 3975.41
Oshinobe Tokai Village 1041.340 2487.28 4041.07
Oba Mito City 1037.670 8170.76 4041.07
Godai Naka City 1031.270 2156.41 4041.07
Ishikawa Mito City 1030.810 2542.17 4043.81
Isobe Hitachiota City 1013.130 12265 4041.07
Yatabe Ibaraki Town 996.127 2132.8 4041.07
Radiation dose at Motomiya city office, Motomiya 992.703 3975.41
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2504.88 4021.92
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2504.88 4021.92
Yokobori Naka City 930.280 2499.08 4041.07
Sugaya Naka City 926.186 3819.16 4043.81
Kounosu Naka City 926.087 1949.64 4041.07
Funaishikawa Tokai Village 900.399 2587.7 4041.07
Nukada Naka City 899.900 2336.4 4035.6
Uridura Naka City 890.113 2230.2 4035.6
Shiraki Tsuruga City 881.330 4735.51 4043.81
Motokomezaki Naka City 880.851 2074.44 4008.24
Shiraki pass Tsuruga City 850.284 4960.16 4043.81
Radiation dose in Yamamoto 846.633 3997.3
Yoshizawa Mito City 837.646 2256.87 4041.07
Radiation dose at JAEA Oarai (P7) 831.135 3997.3
Mayumi Hitachiota City 828.119 2239.14 4041.07
Urasoko Tsuruga City 826.465 3931.47 4043.81
Nemoto Hitachioomiya City 825.588 2521.02 4038.34
Takenami Mihama Town 804.283 4126.56 4043.81
Radiation dose at JAEA Oarai (P15) 780.207 3997.3
Tateishi Tsuruga City 780.092 3269.35 4043.81
Radiation dose at JAEA Oarai (P14) 770.174 3997.3
Radiation dose at JAEA Oarai (P13) 769.612 3997.3
Ukishima Kawasaki Ward 735.475 7715.16 4043.81
Kume Hitachiota City 713.958 2191.86 4041.07
Radiation dose at JAEA Oarai (P2) 712.011 3997.3
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2504.88 4021.92
Nyuu Mihama Town 674.787 3760.03 4043.81
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2509.99 4030.13
Radiation dose in Iwanuma 670.242 3997.3
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2509.99 4030.13
Tsuruga Tsuruga City 655.360 3316.63 4043.81
Shiohama Kawasaki Ward 653.536 2648.59 4043.81
Radiation dose in Kakuda 649.863 3997.3
Sakajiri Mihama Town 649.252 4386.72 4043.81
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2755 4043.81
Radiation dose in Onagawa (MP-2) 632.968 3994.56
Kumatori town Nishi primary school Station 631.491 3292.97 4043.81
Oshima Kawasaki Ward 630.402 2524.44 4043.81
Izumisano municipal Oike athletic field Station 629.920 3712.75 4043.81
Atom-kyoudou nursery school Station 625.566 3564.94 4043.81
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3245.69 4043.81
Nakamachi Omaezaki City 623.494 4179.77 4043.81
Uraga Yokosuka City 622.492 1980.51 4043.81
Goritoge Shika Town 622.143 4439.92 4043.81
Kumatori town Minami primary school Station 606.134 3777.77 4043.81
Radiation dose at JAEA Oarai (P1) 603.643 4000.03
Yamanotedai-No.1 Park Station 599.140 3523.54 4043.81
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4016.45
Noumi Shika Town 594.021 4392.6 4043.81
Radiation dose in Watari 591.851 3997.3
Hairando Yokosuka City 588.667 2483.04 4043.81
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2509.99 4030.13
Ningyotoge Kagamino Town 574.857 3523.54 4043.81
Ten-no Kagamino Town 569.960 4221.17 4043.81
Funagura Yokosuka City 563.909 2341.15 4043.81
Chidori Kawasaki Ward 560.211 2264.28 4043.81
Radiation dose at JAEA Oarai (P16) 556.365 3997.3
Shika Shika Town 551.376 4232.98 4043.81
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2749.08 4043.81
Sahara Yokosuka City 547.404 2193.34 4043.81
Kazanashi Shika Town 545.377 3972.86 4043.81
Akasumi Shika Town 544.970 3635.88 4043.81
Kurahashi Maizuru City 540.820 3310.71 4043.81
Obama Obama City 540.809 2961.91 4043.81
Sakuragaike community hall Omaezaki City 540.772 4286.19 4043.81
Shirowa primary school Omaezaki City 535.692 4197.51 4043.81
Radiation dose at JAEA Oarai (P5) 529.759 3997.3
Uenohara Omaezaki City 529.333 4315.77 4043.81
Kumano Shika Town 529.019 4120.68 4043.81
Izumisano municipal Hineno filtration plant Station 527.471 3553.12 4043.81
Nishi-hamasada Matsue City 525.089 3927.31 4027.39
Kouno Minami-Echizen Town 525.028 2979.65 4043.81
Kurihama Yokosuka City 523.708 2370.7 4043.81
Osaka prefectural Kumatori off-site-center Station 522.808 3275.24 4043.81
Ogasa branch Kikugawa City 522.039 4360.07 4030.13
Izumisano municipal Hineno primary scool Station 518.181 2843.68 4043.81
Shirasuna Omaezaki City 499.479 4227.09 4043.81
Jitougata primary school Makinohara City 498.059 4055.62 4043.81
Kataku Matsue City 497.007 3151.08 4043.81
Nishihemi Yokosuka City 496.917 1891.83 4043.81
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4016.45
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3103.8 4043.81
Otomi Takahama Town 494.821 3476.26 4043.81
Otsu Nanao City 493.895 3488.07 4043.81
The Observation point for comparison Tatsunokuchi 493.454 2873.23 4043.81
Hitsuhama Ohi Town 492.630 3233.88 4043.81
Kijiyama Misasa Town 489.284 3281.16 4043.81
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4016.45
Hiraba Omaezaki City 485.878 4227.09 4043.81
Tayu Matsue City 484.956 3287.08 4043.81
Hamaokakita primary school Omaezaki City 484.537 4330.62 4030.13
Oitomi Ayabe City 474.670 4167.96 4043.81
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4016.45
Kashiwazaki-shigai Kashiwazaki City 470.822 3316.63 4043.81
Mitsu Matsue City 466.897 3145.2 4043.81
Tonomachi Kawasaki Ward 463.967 3984.68 4043.81
Daitou branch Kakegawa City 463.829 4265.82 4030.13
Fukura Shika Town 462.493 3966.94 4043.81
Nagasawa Yokosuka City 462.365 2317.49 4043.81
The athletic field Station of Kinki University 461.661 2619 4043.81
Koura Matsue City 461.049 3754.11 4043.81
Sakurasan Ward Omaezaki City 459.434 4091.09 4043.81
Tsuchikawa Nanao City 458.915 3860.52 4043.81
Kumatori Town office Station 457.917 2701.8 4043.81
Shinkango Omaezaki City 449.013 4735.51 4043.81
Ogurui Takahama Town 448.279 3097.88 4043.81
Kusabue Omaezaki City 444.162 4463.55 4043.81
Omaezaki City monitoring center 443.946 4380.79 4043.81
Akawase Kagamino Town 442.246 2701.8 4043.81
Ibaraki 442.139 1982.4 4035.6
Hinode Town Yokosuka City 438.324 1560.77 4043.81
Nishiyama Kashiwazaki City 437.251 4694.12 4043.81
Kariwa Kariwa Village 436.307 3541.28 4043.81
Osaka prefectural Hineno high scool Station 435.745 3157.01 4043.81
Miyagawa Kashiwazaki City 435.245 3493.99 4043.81
Radiation dose in Natori 434.640 3997.3
Kami-koubu Matsue City 433.868 3434.86 4043.81
Shimo-Takamachi Kariwa Village 433.192 3854.64 4043.81
Osaka prefectural Sano supporting school Station 432.398 3440.78 4043.81
Arahama Kashiwazaki City 428.874 3600.41 4043.81
Doai Kashiwazaki City 425.681 3387.58 4043.81
Owashi Matsue City 424.452 3358.03 4043.81
Okayasu Maizuru City 422.568 3955.13 4043.81
Katsuyama Kariwa Village 421.280 3600.41 4043.81
Kita-koubu Matsue City 420.683 3683.16 4043.81
Kichisaka Maizuru City 413.065 4806.46 4043.81
Nagai Ohi Town 410.699 3492.81 4035.6
Shiokumi Maizuru City 407.938 5982.96 4043.81
Miyadome Ohi Town 407.831 2896.89 4043.81
Kariwa Kariwa Village 407.617 3730.48 4043.81
Ueno Satsuma-sendai City 394.248 2707.68 4043.81
Power Station-South 389.191 3943.32 4043.81
Radiation dose at JAEA Oarai (P6) 386.963 3997.3
Power Station- 385.546 3848.71 4043.81
Takae Satsuma-sendai City 379.551 2743.16 4043.81
Hokawaduura Genkai Town 378.015 4176.83 4043.81
Kou Itimatsu Suetsugu 377.929 3015.12 4043.81
Minato Satsuma-sendai City 377.656 2512.59 4043.81
Iwanai Iwanai Town 376.336 4094.24 4041.07
Hattari Kyowa Town 373.047 3981.98 4041.07
Chatsu Tomari Village 371.011 3804.74 4041.07
Oyama Maizuru City 358.223 3464.44 4043.81
Kodaira Satsuma-sendai City 355.545 2542.17 4043.81
Kayanuma Tomari Village 354.809 3385.28 4041.07
Anojiri Obama City 353.215 2837.76 4043.81
Kushi Genkai Town 349.738 5764.2 4043.81
Yamaguchi 348.715 4531.2 4035.6
Sadahongou Matsue City 348.228 3529.46 4043.81
Sakibe Karatsu City 347.801 5462.69 4043.81
Hirao Genkai Town 343.814 5758.28 4043.81
The Meteorological Obsevatory of kyowa Town 343.275 3775.21 4041.07
Minami-Horoni Kyowa Town 335.180 3538.88 4041.07
Kounoura Takahama Town 330.353 2991.46 4043.81
Kyoudomarisaki Karatsu City 328.622 5852.88 4043.81
Horikappu Jinja Tomari Village 328.230 3662.95 4041.07
Hukada-kita Matsue City 327.031 2902.78 4043.81
Radiation dose in KEK, Tsukuba 326.240 4016.45
Herokaruusu Tomari Village 324.242 3798.86 4041.07
Yorita Satsuma-sendai City 323.218 2973.72 4043.81
Kamoenai Kamoenai Village 322.032 3208.04 4041.07
Radiation dose in Onagawa (MP-6) 316.267 3994.56
Imamura Genkai Town 314.749 49601.6 4043.81
Yamanaka Takahama Town 314.185 3860.52 4043.81
Sendai (Miyagi) 312.585 1816.02 4035.6
Radiation dose in Onagawa (MP-1) 300.147 3994.56
Gumisaki Satsuma-sendai City 295.693 2400.28 4043.81
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4016.45
Aomori Aomori City 285.372 2439.99 4041.07
Misawa City hall Misawa City 283.728 4732.31 4041.07
Kashu Ikata Town 277.173 2477.12 4043.81
Noheji Town Office Noheji Town 272.004 2091.43 4041.07
Takasimamati 271.103 2636.74 4043.81
Radiation dose in Onagawa (MP-3) 270.563 3994.56
Kucho Ikata Town 269.545 2187.45 4043.81
Radiation dose in Marumori 269.436 3997.3
Kawanagata Ikata Town 266.821 2134.24 4043.81
Tochigi 260.733 2371.8 4035.6
Chikagawa Mutu City 256.719 2723.58 4041.07
Yokohama Town Office Yokohama Town 254.846 3338.03 4041.07
Tokyo 251.877 2796.6 4035.6
Hiranuma Rokkasho Village 251.186 2191.86 4041.07
Taisei Ikata Town 246.293 1602.16 4043.81
Chitose-daira Rokkasho Village 245.868 2363.21 4041.07
Gifu 243.951 3894 4035.6
Fukkoshi Yokohama Town 243.102 2292.32 4041.07
Shimane 240.651 3894 4035.6
Sunagomata Higashidoori Village 238.012 3314.39 4041.07
Obuchi Rokkasho Village 237.506 2634.96 4041.07
Tomari Rokkasho Village 230.636 3686.59 4041.07
kanagawa 226.339 2442.6 4035.6
Saitama 219.770 2124 4035.6
Ikatagoshi Ikata Town 217.515 2015.98 4043.81
Touhoku Branch office Touhoku Town 215.416 1908.27 4041.07
Radiation dose at Tohoku University 214.824 3997.3
Odanosawa Higashidoori Village 210.287 2640.88 4041.07
Kagawa 205.829 2725.8 4035.6
Oippe Higashidoori Village 205.182 2274.59 4041.07
Oita 200.921 3009 4035.6
Touhoku Town office Touhoku Town 200.811 8826.55 4041.07
Kuchogoshi Ikata Town 198.646 2045.56 4043.81
Minatoura Ikata Town 186.776 1838.62 4043.81
Radiation dose in Koyadori, Ojika 184.905 3991.82
Toyama 184.580 5203.8 4035.6
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2509.99 4030.13
Radiation dose in Tukahama, Ojika 183.417 3991.82
Chiba 182.407 1557.6 4035.6
Nara 182.387 2832 4035.6
Okayama 181.976 3681.6 4035.6
Yamagata 181.598 2902.8 4035.6
Ehime 180.745 2619.6 4035.6
Ishikawa 180.445 4513.5 4035.6
Niigata 177.483 5416.2 4035.6
Hiroshima 176.816 2442.6 4035.6
Mie 174.867 2793.06 4035.6
Fukui 170.045 3433.8 4035.6
Radiation dose in Terama, Ojika 168.036 3991.82
Yamanashi 164.561 2265.6 4035.6
Nagano 162.242 3447.96 4035.6
Saga 161.421 3044.4 4035.6
Tottori 161.392 2796.6 4035.6
Radiation dose in Enoshima, Ojika 160.091 3991.82
Osaka 159.103 2159.4 4035.6
Ibaraki-city Environment 157.249 3950.78
Aichi 149.345 2619.6 4035.6
Toyonoura Ikata Town 149.214 2110.58 4043.81
Shizuoka 148.639 2708.1 4035.6
Kyoto 144.522 3079.8 4035.6
Kagoshima 144.449 3338.22 4035.6
Tokushima 143.627 2371.8 4035.6
Gunma 143.572 1593 4035.6
Hyogo 139.710 2690.4 4035.6
Fukuoka 136.511 2796.6 4035.6
Wakayama 133.857 1982.4 4035.6
Radiation at Tamaki-cho Mie Japan 133.138 3950.78
Akita 132.832 3044.4 4035.6
Shiga 124.919 2159.4 4035.6
Nagasaki 109.459 2442.6 4035.6
Hokkaido 109.189 3717 4035.6
Kumamoto 103.568 2371.8 4035.6
Aomori 101.819 3610.8 4035.6
Miyazaki 100.354 2350.56 4035.6
Kochi 95.931 2690.4 4035.6
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2501.47 4016.45
Iwate 90.324 2973.6 4035.6
Environment Feeds from Ohta 83.623 3950.78
Okinawa 82.305 2035.5 4035.6
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