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Accumulated absorbed dose rate - T=13.03.2011 - 27.08.2014(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 3370.75
Fukushima I MP8 570942.000 3370.75
Fukushima I MP6 240668.000 3370.75
Yamada Futaba Town 176983.000 2456.73 2927.52
Fukushima I MP2 140420.000 3370.75
Fukushima I MP5 111325.000 3370.75
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2143.63 3441.89
Fukushima I MP3 93730.602 3370.75
Fukushima I MP4 86821.500 3370.75
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2143.63 3441.89
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2092.51 3359.81
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2143.63 3441.89
Ono Okuma Town 38610.500 2268.39 2927.52
Shinzan Futaba Town 38332.801 2058.69 2927.52
Fukushima I MP1 31496.801 3370.75
Yonomori Tomioka Town 29815.900 2345.43 2927.52
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2143.63 3441.89
Tomioka Tomioka Town 25324.500 2525.19 2927.52
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2143.63 3441.89
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2143.63 3441.89
Shimo-Kooriyama Tomioka Town 13057.000 2508.09 2927.52
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2143.63 3441.89
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2143.63 3441.89
Kami-kooriyama Tomioka Town 11803.900 1968.81 2927.52
Fukushima II MP3 11060.600 3370.75
Fukushima II MP1 10903.000 3370.75
Kooriyama Futaba Town 10352.900 2294.07 2927.52
Fukushima II MP4 9696.330 3370.75
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2140.22 3436.42
Fukushima II MP5 9382.150 3370.75
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2143.63 3441.89
Matsudate Naraha Town 8410.890 2679.27 2927.52
Shigeoka Naraha Town 8115.970 2961.75 2927.52
Fukushima II MP2 7875.320 3370.75
Namie Namie Town 7321.210 2161.41 2927.52
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3387.17
Fukushima II MP6 7062.690 3370.75
Fukushima II MP7 6511.580 3368.02
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2143.63 3441.89
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2143.63 3441.89
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2143.63 3441.89
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2143.63 3441.89
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2143.63 3441.89
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2143.63 3441.89
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2138.52 3433.68
Futatsunuma Hirono Town 3520.340 2568 2927.52
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2143.63 3441.89
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2143.63 3441.89
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3384.43
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2143.63 3441.89
Kiyohashi Namie Town 3162.000 1896.03 2927.52
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2138.52 3433.68
Radiation dose at Agricultural center, Koriyama 3128.960 3384.43
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2143.63 3441.89
Radiation dose at Koriyama city office, Koriyama 2803.520 3384.43
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2143.63 3441.89
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2138.52 3433.68
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2143.63 3441.89
Yamadaoka Naraha Town 2205.340 2276.97 2927.52
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3387.17
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2143.63 3441.89
Kuji Hitachi City 1990.890 5330.69 3452.83
Hitachinaka Hitachinaka City 1951.950 2340.41 3450.1
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2138.52 3433.68
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2138.52 3433.68
Momiyama Hokota City 1837.540 2670.4 3452.83
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2138.52 3433.68
Horiguchi Hitachinaka City 1779.410 2334.02 3455.57
Onuma Hitachi City 1776.950 1987.35 3450.1
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2143.63 3441.89
Tsukuriya Hokota City 1736.890 2246.37 3452.83
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3384.43
Nemoto Hitachioomiya City 1633.190 2501.83 3450.1
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2143.63 3441.89
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2143.63 3441.89
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3392.64
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2143.63 3441.89
Radiation dose at JAEA Oarai (P12) 1512.140 3409.06
Radiation dose at Ose administration center, Koriyama 1494.270 3384.43
Araji Hokota City 1437.760 2251.4 3452.83
Ishigami Tokai Village 1431.690 2049.5 3452.83
Mawatari Hitachinaka City 1422.870 2367.52 3452.83
Radiation dose at JAEA Oarai (P11) 1399.370 3409.06
Onuki Oarai Town 1387.990 2458.39 3452.83
Sawa Hitachinaka City 1353.770 1856.18 3450.1
Toyooka Tokai Village 1321.760 2256.46 3452.83
Ajigaura Hitachinaka City 1313.890 2219.35 3450.1
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2143.63 3441.89
Geiger Counter Feeds from Asao Kawasaki 1266.620 3362.54
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3384.43
Isohama Oarai Town 1250.540 2141.99 3447.36
Ebisawa Ibaraki Town 1222.240 5816.74 3450.1
Muramatsu Tokai Village 1203.520 2276.66 3452.83
Kamitoda Hokota City 1184.740 1867.77 3452.83
Yanagisawa Hitachinaka City 1166.970 1901.58 3450.1
Tokushuku Hokota City 1159.730 1686.04 3452.83
Tasaki Hokota City 1153.300 1986.6 3422.74
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2143.63 3441.89
Kadobe Naka City 1086.580 4529.52 3450.1
Radiation dose at Date city office, Date 1076.050 3387.17
Oshinobe Tokai Village 1041.340 2125.22 3452.83
Oba Mito City 1037.670 6981.38 3452.83
Godai Naka City 1031.270 1842.51 3452.83
Ishikawa Mito City 1030.810 2172.37 3455.57
Isobe Hitachiota City 1013.130 10479.6 3452.83
Yatabe Ibaraki Town 996.127 1822.34 3452.83
Radiation dose at Motomiya city office, Motomiya 992.703 3387.17
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2138.52 3433.68
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2138.52 3433.68
Yokobori Naka City 930.280 2135.3 3452.83
Sugaya Naka City 926.186 3263.6 3455.57
Kounosu Naka City 926.087 1665.84 3452.83
Funaishikawa Tokai Village 900.399 2211.02 3452.83
Nukada Naka City 899.900 1995.84 3447.36
Uridura Naka City 890.113 1905.12 3447.36
Shiraki Tsuruga City 881.330 4046.65 3455.57
Motokomezaki Naka City 880.851 1770 3420
Shiraki pass Tsuruga City 850.284 4238.62 3455.57
Radiation dose in Yamamoto 846.633 3409.06
Yoshizawa Mito City 837.646 1928.35 3452.83
Radiation dose at JAEA Oarai (P7) 831.135 3409.06
Mayumi Hitachiota City 828.119 1913.2 3452.83
Urasoko Tsuruga City 826.465 3359.57 3455.57
Nemoto Hitachioomiya City 825.588 2153.8 3450.1
Takenami Mihama Town 804.283 3526.29 3455.57
Radiation dose at JAEA Oarai (P15) 780.207 3409.06
Tateishi Tsuruga City 780.092 2793.77 3455.57
Radiation dose at JAEA Oarai (P14) 770.174 3409.06
Radiation dose at JAEA Oarai (P13) 769.612 3409.06
Ukishima Kawasaki Ward 735.475 6592.86 3455.57
Kume Hitachiota City 713.958 1872.8 3452.83
Radiation dose at JAEA Oarai (P2) 712.011 3409.06
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2138.52 3433.68
Nyuu Mihama Town 674.787 3213.07 3455.57
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2143.63 3441.89
Radiation dose in Iwanuma 670.242 3409.06
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2143.63 3441.89
Tsuruga Tsuruga City 655.360 2834.17 3455.57
Shiohama Kawasaki Ward 653.536 2263.31 3455.57
Radiation dose in Kakuda 649.863 3409.06
Sakajiri Mihama Town 649.252 3748.59 3455.57
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2354.24 3455.57
Radiation dose in Onagawa (MP-2) 632.968 3406.32
Kumatori town Nishi primary school Station 631.491 2813.95 3455.57
Oshima Kawasaki Ward 630.402 2157.21 3455.57
Izumisano municipal Oike athletic field Station 629.920 3172.67 3455.57
Atom-kyoudou nursery school Station 625.566 3046.36 3455.57
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2773.55 3455.57
Nakamachi Omaezaki City 623.494 3571.75 3455.57
Uraga Yokosuka City 622.492 1692.41 3455.57
Goritoge Shika Town 622.143 3794.06 3455.57
Kumatori town Minami primary school Station 606.134 3228.23 3455.57
Radiation dose at JAEA Oarai (P1) 603.643 3411.79
Yamanotedai-No.1 Park Station 599.140 3010.98 3455.57
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3428.21
Noumi Shika Town 594.021 3753.63 3455.57
Radiation dose in Watari 591.851 3409.06
Hairando Yokosuka City 588.667 2121.84 3455.57
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2143.63 3441.89
Ningyotoge Kagamino Town 574.857 3010.98 3455.57
Ten-no Kagamino Town 569.960 3607.13 3455.57
Funagura Yokosuka City 563.909 2000.59 3455.57
Chidori Kawasaki Ward 560.211 1934.91 3455.57
Radiation dose at JAEA Oarai (P16) 556.365 3409.06
Shika Shika Town 551.376 3617.22 3455.57
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2349.18 3455.57
Sahara Yokosuka City 547.404 1874.28 3455.57
Kazanashi Shika Town 545.377 3394.94 3455.57
Akasumi Shika Town 544.970 3106.98 3455.57
Kurahashi Maizuru City 540.820 2829.11 3455.57
Obama Obama City 540.809 2531.05 3455.57
Sakuragaike community hall Omaezaki City 540.772 3662.69 3455.57
Shirowa primary school Omaezaki City 535.692 3586.91 3455.57
Radiation dose at JAEA Oarai (P5) 529.759 3409.06
Uenohara Omaezaki City 529.333 3687.97 3455.57
Kumano Shika Town 529.019 3521.25 3455.57
Izumisano municipal Hineno filtration plant Station 527.471 3036.26 3455.57
Nishi-hamasada Matsue City 525.089 3353.69 3439.15
Kouno Minami-Echizen Town 525.028 2546.21 3455.57
Kurihama Yokosuka City 523.708 2025.84 3455.57
Osaka prefectural Kumatori off-site-center Station 522.808 2798.8 3455.57
Ogasa branch Kikugawa City 522.039 3723.67 3441.89
Izumisano municipal Hineno primary scool Station 518.181 2430.02 3455.57
Shirasuna Omaezaki City 499.479 3612.19 3455.57
Jitougata primary school Makinohara City 498.059 3465.66 3455.57
Kataku Matsue City 497.007 2692.71 3455.57
Nishihemi Yokosuka City 496.917 1616.63 3455.57
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3428.21
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2652.3 3455.57
Otomi Takahama Town 494.821 2970.58 3455.57
Otsu Nanao City 493.895 2980.67 3455.57
The Observation point for comparison Tatsunokuchi 493.454 2455.27 3455.57
Hitsuhama Ohi Town 492.630 2763.45 3455.57
Kijiyama Misasa Town 489.284 2803.86 3455.57
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3428.21
Hiraba Omaezaki City 485.878 3612.19 3455.57
Tayu Matsue City 484.956 2808.92 3455.57
Hamaokakita primary school Omaezaki City 484.537 3698.52 3441.89
Oitomi Ayabe City 474.670 3561.66 3455.57
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3428.21
Kashiwazaki-shigai Kashiwazaki City 470.822 2834.17 3455.57
Mitsu Matsue City 466.897 2687.67 3455.57
Tonomachi Kawasaki Ward 463.967 3405.04 3455.57
Daitou branch Kakegawa City 463.829 3643.18 3441.89
Fukura Shika Town 462.493 3389.88 3455.57
Nagasawa Yokosuka City 462.365 1980.37 3455.57
The athletic field Station of Kinki University 461.661 2238.03 3455.57
Koura Matsue City 461.049 3208.01 3455.57
Sakurasan Ward Omaezaki City 459.434 3495.97 3455.57
Tsuchikawa Nanao City 458.915 3298.95 3455.57
Kumatori Town office Station 457.917 2308.77 3455.57
Shinkango Omaezaki City 449.013 4046.65 3455.57
Ogurui Takahama Town 448.279 2647.24 3455.57
Kusabue Omaezaki City 444.162 3814.25 3455.57
Omaezaki City monitoring center 443.946 3743.53 3455.57
Akawase Kagamino Town 442.246 2308.77 3455.57
Ibaraki 442.139 1693.44 3447.36
Hinode Town Yokosuka City 438.324 1333.73 3455.57
Nishiyama Kashiwazaki City 437.251 4011.28 3455.57
Kariwa Kariwa Village 436.307 3026.14 3455.57
Osaka prefectural Hineno high scool Station 435.745 2697.77 3455.57
Miyagawa Kashiwazaki City 435.245 2985.73 3455.57
Radiation dose in Natori 434.640 3409.06
Kami-koubu Matsue City 433.868 2935.2 3455.57
Shimo-Takamachi Kariwa Village 433.192 3293.91 3455.57
Osaka prefectural Sano supporting school Station 432.398 2940.26 3455.57
Arahama Kashiwazaki City 428.874 3076.67 3455.57
Doai Kashiwazaki City 425.681 2894.8 3455.57
Owashi Matsue City 424.452 2869.55 3455.57
Okayasu Maizuru City 422.568 3379.79 3455.57
Katsuyama Kariwa Village 421.280 3076.67 3455.57
Kita-koubu Matsue City 420.683 3147.39 3455.57
Kichisaka Maizuru City 413.065 4107.28 3455.57
Nagai Ohi Town 410.699 2983.69 3447.36
Shiokumi Maizuru City 407.938 5112.63 3455.57
Miyadome Ohi Town 407.831 2475.49 3455.57
Kariwa Kariwa Village 407.617 3187.82 3455.57
Ueno Satsuma-sendai City 394.248 2313.81 3455.57
Power Station-South 389.191 3369.69 3455.57
Radiation dose at JAEA Oarai (P6) 386.963 3409.06
Power Station- 385.546 3288.85 3455.57
Takae Satsuma-sendai City 379.551 2344.12 3455.57
Hokawaduura Genkai Town 378.015 3569.24 3455.57
Kou Itimatsu Suetsugu 377.929 2576.52 3455.57
Minato Satsuma-sendai City 377.656 2147.09 3455.57
Iwanai Iwanai Town 376.336 3498.26 3452.83
Hattari Kyowa Town 373.047 3402.34 3452.83
Chatsu Tomari Village 371.011 3250.9 3452.83
Oyama Maizuru City 358.223 2960.48 3455.57
Kodaira Satsuma-sendai City 355.545 2172.37 3455.57
Kayanuma Tomari Village 354.809 2892.5 3452.83
Anojiri Obama City 353.215 2424.96 3455.57
Kushi Genkai Town 349.738 4925.7 3455.57
Yamaguchi 348.715 3870.72 3447.36
Sadahongou Matsue City 348.228 3016.04 3455.57
Sakibe Karatsu City 347.801 4668.05 3455.57
Hirao Genkai Town 343.814 4920.64 3455.57
The Meteorological Obsevatory of kyowa Town 343.275 3225.67 3452.83
Minami-Horoni Kyowa Town 335.180 3023.74 3452.83
Kounoura Takahama Town 330.353 2556.3 3455.57
Kyoudomarisaki Karatsu City 328.622 5001.48 3455.57
Horikappu Jinja Tomari Village 328.230 3129.75 3452.83
Hukada-kita Matsue City 327.031 2480.52 3455.57
Radiation dose in KEK, Tsukuba 326.240 3428.21
Herokaruusu Tomari Village 324.242 3245.87 3452.83
Yorita Satsuma-sendai City 323.218 2541.15 3455.57
Kamoenai Kamoenai Village 322.032 2741.06 3452.83
Radiation dose in Onagawa (MP-6) 316.267 3406.32
Imamura Genkai Town 314.749 42386.2 3455.57
Yamanaka Takahama Town 314.185 3298.95 3455.57
Sendai (Miyagi) 312.585 1551.31 3447.36
Radiation dose in Onagawa (MP-1) 300.147 3406.32
Gumisaki Satsuma-sendai City 295.693 2051.12 3455.57
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3428.21
Aomori Aomori City 285.372 2084.81 3452.83
Misawa City hall Misawa City 283.728 4043.45 3452.83
Kashu Ikata Town 277.173 2116.78 3455.57
Noheji Town Office Noheji Town 272.004 1786.99 3452.83
Takasimamati 271.103 2253.18 3455.57
Radiation dose in Onagawa (MP-3) 270.563 3406.32
Kucho Ikata Town 269.545 1869.25 3455.57
Radiation dose in Marumori 269.436 3409.06
Kawanagata Ikata Town 266.821 1823.78 3455.57
Tochigi 260.733 2026.08 3447.36
Chikagawa Mutu City 256.719 2327.12 3452.83
Yokohama Town Office Yokohama Town 254.846 2852.13 3452.83
Tokyo 251.877 2388.96 3447.36
Hiranuma Rokkasho Village 251.186 1872.8 3452.83
Taisei Ikata Town 246.293 1369.1 3455.57
Chitose-daira Rokkasho Village 245.868 2019.21 3452.83
Gifu 243.951 3326.4 3447.36
Fukkoshi Yokohama Town 243.102 1958.63 3452.83
Shimane 240.651 3326.4 3447.36
Sunagomata Higashidoori Village 238.012 2831.93 3452.83
Obuchi Rokkasho Village 237.506 2251.4 3452.83
Tomari Rokkasho Village 230.636 3149.95 3452.83
kanagawa 226.339 2086.56 3447.36
Saitama 219.770 1814.4 3447.36
Ikatagoshi Ikata Town 217.515 1722.72 3455.57
Touhoku Branch office Touhoku Town 215.416 1630.49 3452.83
Radiation dose at Tohoku University 214.824 3409.06
Odanosawa Higashidoori Village 210.287 2256.46 3452.83
Kagawa 205.829 2328.48 3447.36
Oippe Higashidoori Village 205.182 1943.49 3452.83
Oita 200.921 2570.4 3447.36
Touhoku Town office Touhoku Town 200.811 7541.71 3452.83
Kuchogoshi Ikata Town 198.646 1748 3455.57
Minatoura Ikata Town 186.776 1571.16 3455.57
Radiation dose in Koyadori, Ojika 184.905 3403.58
Toyama 184.580 4445.28 3447.36
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2143.63 3441.89
Radiation dose in Tukahama, Ojika 183.417 3403.58
Chiba 182.407 1330.56 3447.36
Nara 182.387 2419.2 3447.36
Okayama 181.976 3144.96 3447.36
Yamagata 181.598 2479.68 3447.36
Ehime 180.745 2237.76 3447.36
Ishikawa 180.445 3855.6 3447.36
Niigata 177.483 4626.72 3447.36
Hiroshima 176.816 2086.56 3447.36
Mie 174.867 2385.94 3447.36
Fukui 170.045 2933.28 3447.36
Radiation dose in Terama, Ojika 168.036 3403.58
Yamanashi 164.561 1935.36 3447.36
Nagano 162.242 2945.38 3447.36
Saga 161.421 2600.64 3447.36
Tottori 161.392 2388.96 3447.36
Radiation dose in Enoshima, Ojika 160.091 3403.58
Osaka 159.103 1844.64 3447.36
Ibaraki-city Environment 157.249 3362.54
Aichi 149.345 2237.76 3447.36
Toyonoura Ikata Town 149.214 1803.56 3455.57
Shizuoka 148.639 2313.36 3447.36
Kyoto 144.522 2630.88 3447.36
Kagoshima 144.449 2851.63 3447.36
Tokushima 143.627 2026.08 3447.36
Gunma 143.572 1360.8 3447.36
Hyogo 139.710 2298.24 3447.36
Fukuoka 136.511 2388.96 3447.36
Wakayama 133.857 1693.44 3447.36
Radiation at Tamaki-cho Mie Japan 133.138 3362.54
Akita 132.832 2600.64 3447.36
Shiga 124.919 1844.64 3447.36
Nagasaki 109.459 2086.56 3447.36
Hokkaido 109.189 3175.2 3447.36
Kumamoto 103.568 2026.08 3447.36
Aomori 101.819 3084.48 3447.36
Miyazaki 100.354 2007.94 3447.36
Kochi 95.931 2298.24 3447.36
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2135.11 3428.21
Iwate 90.324 2540.16 3447.36
Environment Feeds from Ohta 83.623 3362.54
Okinawa 82.305 1738.8 3447.36
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