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Accumulated absorbed dose rate - T=13.03.2011 - 29.08.2014(see missing values above)

< Acc. Vmax < 2 * Acc. Vmax < 4 * Acc. Vmax > 4 * Ac.. Vmax
Stations: 353 Acc. abs. dose rate
μGy/T
Acc. Vmax
μGy/T
Acc. Vmean
μGy/T
Fukushima I MP7 696005.000 3376.22
Fukushima I MP8 570942.000 3376.22
Fukushima I MP6 240668.000 3376.22
Yamada Futaba Town 176983.000 2461.32 2932.99
Fukushima I MP2 140420.000 3376.22
Fukushima I MP5 111325.000 3376.22
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2147.04 3447.36
Fukushima I MP3 93730.602 3376.22
Fukushima I MP4 86821.500 3376.22
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2147.04 3447.36
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2095.92 3365.28
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2147.04 3447.36
Ono Okuma Town 38610.500 2272.63 2932.99
Shinzan Futaba Town 38332.801 2062.54 2932.99
Fukushima I MP1 31496.801 3376.22
Yonomori Tomioka Town 29815.900 2349.82 2932.99
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2147.04 3447.36
Tomioka Tomioka Town 25324.500 2529.91 2932.99
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2147.04 3447.36
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2147.04 3447.36
Shimo-Kooriyama Tomioka Town 13057.000 2512.78 2932.99
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2147.04 3447.36
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2147.04 3447.36
Kami-kooriyama Tomioka Town 11803.900 1972.49 2932.99
Fukushima II MP3 11060.600 3376.22
Fukushima II MP1 10903.000 3376.22
Kooriyama Futaba Town 10352.900 2298.36 2932.99
Fukushima II MP4 9696.330 3376.22
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2143.63 3441.89
Fukushima II MP5 9382.150 3376.22
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2147.04 3447.36
Matsudate Naraha Town 8410.890 2684.28 2932.99
Shigeoka Naraha Town 8115.970 2967.29 2932.99
Fukushima II MP2 7875.320 3376.22
Namie Namie Town 7321.210 2165.45 2932.99
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3392.64
Fukushima II MP6 7062.690 3376.22
Fukushima II MP7 6511.580 3373.49
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2147.04 3447.36
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2147.04 3447.36
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2147.04 3447.36
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2147.04 3447.36
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2147.04 3447.36
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2147.04 3447.36
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2141.93 3439.15
Futatsunuma Hirono Town 3520.340 2572.8 2932.99
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2147.04 3447.36
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2147.04 3447.36
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3389.9
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2147.04 3447.36
Kiyohashi Namie Town 3162.000 1899.58 2932.99
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2141.93 3439.15
Radiation dose at Agricultural center, Koriyama 3128.960 3389.9
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2147.04 3447.36
Radiation dose at Koriyama city office, Koriyama 2803.520 3389.9
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2147.04 3447.36
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2141.93 3439.15
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2147.04 3447.36
Yamadaoka Naraha Town 2205.340 2281.22 2932.99
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3392.64
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2147.04 3447.36
Kuji Hitachi City 1990.890 5339.14 3458.3
Hitachinaka Hitachinaka City 1951.950 2344.12 3455.57
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2141.93 3439.15
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2141.93 3439.15
Momiyama Hokota City 1837.540 2674.63 3458.3
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2141.93 3439.15
Horiguchi Hitachinaka City 1779.410 2337.72 3461.04
Onuma Hitachi City 1776.950 1990.5 3455.57
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2147.04 3447.36
Tsukuriya Hokota City 1736.890 2249.93 3458.3
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3389.9
Nemoto Hitachioomiya City 1633.190 2505.8 3455.57
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2147.04 3447.36
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2147.04 3447.36
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3398.11
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2147.04 3447.36
Radiation dose at JAEA Oarai (P12) 1512.140 3414.53
Radiation dose at Ose administration center, Koriyama 1494.270 3389.9
Araji Hokota City 1437.760 2254.97 3458.3
Ishigami Tokai Village 1431.690 2052.75 3458.3
Mawatari Hitachinaka City 1422.870 2371.27 3458.3
Radiation dose at JAEA Oarai (P11) 1399.370 3414.53
Onuki Oarai Town 1387.990 2462.28 3458.3
Sawa Hitachinaka City 1353.770 1859.13 3455.57
Toyooka Tokai Village 1321.760 2260.03 3458.3
Ajigaura Hitachinaka City 1313.890 2222.87 3455.57
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2147.04 3447.36
Geiger Counter Feeds from Asao Kawasaki 1266.620 3368.02
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3389.9
Isohama Oarai Town 1250.540 2145.39 3452.83
Ebisawa Ibaraki Town 1222.240 5825.97 3455.57
Muramatsu Tokai Village 1203.520 2280.27 3458.3
Kamitoda Hokota City 1184.740 1870.73 3458.3
Yanagisawa Hitachinaka City 1166.970 1904.59 3455.57
Tokushuku Hokota City 1159.730 1688.71 3458.3
Tasaki Hokota City 1153.300 1989.77 3428.21
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2147.04 3447.36
Kadobe Naka City 1086.580 4536.71 3455.57
Radiation dose at Date city office, Date 1076.050 3392.64
Oshinobe Tokai Village 1041.340 2128.59 3458.3
Oba Mito City 1037.670 6992.45 3458.3
Godai Naka City 1031.270 1845.43 3458.3
Ishikawa Mito City 1030.810 2175.81 3461.04
Isobe Hitachiota City 1013.130 10496.3 3458.3
Yatabe Ibaraki Town 996.127 1825.23 3458.3
Radiation dose at Motomiya city office, Motomiya 992.703 3392.64
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2141.93 3439.15
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2141.93 3439.15
Yokobori Naka City 930.280 2138.69 3458.3
Sugaya Naka City 926.186 3268.77 3461.04
Kounosu Naka City 926.087 1668.48 3458.3
Funaishikawa Tokai Village 900.399 2214.53 3458.3
Nukada Naka City 899.900 1999.01 3452.83
Uridura Naka City 890.113 1908.14 3452.83
Shiraki Tsuruga City 881.330 4053.06 3461.04
Motokomezaki Naka City 880.851 1772.83 3425.47
Shiraki pass Tsuruga City 850.284 4245.33 3461.04
Radiation dose in Yamamoto 846.633 3414.53
Yoshizawa Mito City 837.646 1931.4 3458.3
Radiation dose at JAEA Oarai (P7) 831.135 3414.53
Mayumi Hitachiota City 828.119 1916.23 3458.3
Urasoko Tsuruga City 826.465 3364.89 3461.04
Nemoto Hitachioomiya City 825.588 2157.21 3455.57
Takenami Mihama Town 804.283 3531.87 3461.04
Radiation dose at JAEA Oarai (P15) 780.207 3414.53
Tateishi Tsuruga City 780.092 2798.19 3461.04
Radiation dose at JAEA Oarai (P14) 770.174 3414.53
Radiation dose at JAEA Oarai (P13) 769.612 3414.53
Ukishima Kawasaki Ward 735.475 6603.3 3461.04
Kume Hitachiota City 713.958 1875.77 3458.3
Radiation dose at JAEA Oarai (P2) 712.011 3414.53
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2141.93 3439.15
Nyuu Mihama Town 674.787 3218.16 3461.04
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2147.04 3447.36
Radiation dose in Iwanuma 670.242 3414.53
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2147.04 3447.36
Tsuruga Tsuruga City 655.360 2838.66 3461.04
Shiohama Kawasaki Ward 653.536 2266.89 3461.04
Radiation dose in Kakuda 649.863 3414.53
Sakajiri Mihama Town 649.252 3754.53 3461.04
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2357.97 3461.04
Radiation dose in Onagawa (MP-2) 632.968 3411.79
Kumatori town Nishi primary school Station 631.491 2818.41 3461.04
Oshima Kawasaki Ward 630.402 2160.63 3461.04
Izumisano municipal Oike athletic field Station 629.920 3177.69 3461.04
Atom-kyoudou nursery school Station 625.566 3051.18 3461.04
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2777.94 3461.04
Nakamachi Omaezaki City 623.494 3577.41 3461.04
Uraga Yokosuka City 622.492 1695.09 3461.04
Goritoge Shika Town 622.143 3800.07 3461.04
Kumatori town Minami primary school Station 606.134 3233.34 3461.04
Radiation dose at JAEA Oarai (P1) 603.643 3417.26
Yamanotedai-No.1 Park Station 599.140 3015.75 3461.04
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3433.68
Noumi Shika Town 594.021 3759.57 3461.04
Radiation dose in Watari 591.851 3414.53
Hairando Yokosuka City 588.667 2125.2 3461.04
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2147.04 3447.36
Ningyotoge Kagamino Town 574.857 3015.75 3461.04
Ten-no Kagamino Town 569.960 3612.84 3461.04
Funagura Yokosuka City 563.909 2003.76 3461.04
Chidori Kawasaki Ward 560.211 1937.97 3461.04
Radiation dose at JAEA Oarai (P16) 556.365 3414.53
Shika Shika Town 551.376 3622.95 3461.04
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2352.9 3461.04
Sahara Yokosuka City 547.404 1877.25 3461.04
Kazanashi Shika Town 545.377 3400.32 3461.04
Akasumi Shika Town 544.970 3111.9 3461.04
Kurahashi Maizuru City 540.820 2833.59 3461.04
Obama Obama City 540.809 2535.06 3461.04
Sakuragaike community hall Omaezaki City 540.772 3668.49 3461.04
Shirowa primary school Omaezaki City 535.692 3592.59 3461.04
Radiation dose at JAEA Oarai (P5) 529.759 3414.53
Uenohara Omaezaki City 529.333 3693.81 3461.04
Kumano Shika Town 529.019 3526.83 3461.04
Izumisano municipal Hineno filtration plant Station 527.471 3041.07 3461.04
Nishi-hamasada Matsue City 525.089 3359.02 3444.62
Kouno Minami-Echizen Town 525.028 2550.24 3461.04
Kurihama Yokosuka City 523.708 2029.05 3461.04
Osaka prefectural Kumatori off-site-center Station 522.808 2803.23 3461.04
Ogasa branch Kikugawa City 522.039 3729.59 3447.36
Izumisano municipal Hineno primary scool Station 518.181 2433.87 3461.04
Shirasuna Omaezaki City 499.479 3617.91 3461.04
Jitougata primary school Makinohara City 498.059 3471.15 3461.04
Kataku Matsue City 497.007 2696.97 3461.04
Nishihemi Yokosuka City 496.917 1619.19 3461.04
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3433.68
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2656.5 3461.04
Otomi Takahama Town 494.821 2975.28 3461.04
Otsu Nanao City 493.895 2985.39 3461.04
The Observation point for comparison Tatsunokuchi 493.454 2459.16 3461.04
Hitsuhama Ohi Town 492.630 2767.83 3461.04
Kijiyama Misasa Town 489.284 2808.3 3461.04
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3433.68
Hiraba Omaezaki City 485.878 3617.91 3461.04
Tayu Matsue City 484.956 2813.37 3461.04
Hamaokakita primary school Omaezaki City 484.537 3704.4 3447.36
Oitomi Ayabe City 474.670 3567.3 3461.04
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3433.68
Kashiwazaki-shigai Kashiwazaki City 470.822 2838.66 3461.04
Mitsu Matsue City 466.897 2691.93 3461.04
Tonomachi Kawasaki Ward 463.967 3410.43 3461.04
Daitou branch Kakegawa City 463.829 3648.97 3447.36
Fukura Shika Town 462.493 3395.25 3461.04
Nagasawa Yokosuka City 462.365 1983.51 3461.04
The athletic field Station of Kinki University 461.661 2241.57 3461.04
Koura Matsue City 461.049 3213.09 3461.04
Sakurasan Ward Omaezaki City 459.434 3501.51 3461.04
Tsuchikawa Nanao City 458.915 3304.17 3461.04
Kumatori Town office Station 457.917 2312.43 3461.04
Shinkango Omaezaki City 449.013 4053.06 3461.04
Ogurui Takahama Town 448.279 2651.43 3461.04
Kusabue Omaezaki City 444.162 3820.29 3461.04
Omaezaki City monitoring center 443.946 3749.46 3461.04
Akawase Kagamino Town 442.246 2312.43 3461.04
Ibaraki 442.139 1696.13 3452.83
Hinode Town Yokosuka City 438.324 1335.84 3461.04
Nishiyama Kashiwazaki City 437.251 4017.63 3461.04
Kariwa Kariwa Village 436.307 3030.93 3461.04
Osaka prefectural Hineno high scool Station 435.745 2702.04 3461.04
Miyagawa Kashiwazaki City 435.245 2990.46 3461.04
Radiation dose in Natori 434.640 3414.53
Kami-koubu Matsue City 433.868 2939.85 3461.04
Shimo-Takamachi Kariwa Village 433.192 3299.13 3461.04
Osaka prefectural Sano supporting school Station 432.398 2944.92 3461.04
Arahama Kashiwazaki City 428.874 3081.54 3461.04
Doai Kashiwazaki City 425.681 2899.38 3461.04
Owashi Matsue City 424.452 2874.09 3461.04
Okayasu Maizuru City 422.568 3385.14 3461.04
Katsuyama Kariwa Village 421.280 3081.54 3461.04
Kita-koubu Matsue City 420.683 3152.37 3461.04
Kichisaka Maizuru City 413.065 4113.78 3461.04
Nagai Ohi Town 410.699 2988.43 3452.83
Shiokumi Maizuru City 407.938 5120.73 3461.04
Miyadome Ohi Town 407.831 2479.41 3461.04
Kariwa Kariwa Village 407.617 3192.87 3461.04
Ueno Satsuma-sendai City 394.248 2317.47 3461.04
Power Station-South 389.191 3375.03 3461.04
Radiation dose at JAEA Oarai (P6) 386.963 3414.53
Power Station- 385.546 3294.06 3461.04
Takae Satsuma-sendai City 379.551 2347.83 3461.04
Hokawaduura Genkai Town 378.015 3574.89 3461.04
Kou Itimatsu Suetsugu 377.929 2580.6 3461.04
Minato Satsuma-sendai City 377.656 2150.49 3461.04
Iwanai Iwanai Town 376.336 3503.81 3458.3
Hattari Kyowa Town 373.047 3407.73 3458.3
Chatsu Tomari Village 371.011 3256.05 3458.3
Oyama Maizuru City 358.223 2965.17 3461.04
Kodaira Satsuma-sendai City 355.545 2175.81 3461.04
Kayanuma Tomari Village 354.809 2897.09 3458.3
Anojiri Obama City 353.215 2428.8 3461.04
Kushi Genkai Town 349.738 4933.5 3461.04
Yamaguchi 348.715 3876.86 3452.83
Sadahongou Matsue City 348.228 3020.82 3461.04
Sakibe Karatsu City 347.801 4675.44 3461.04
Hirao Genkai Town 343.814 4928.43 3461.04
The Meteorological Obsevatory of kyowa Town 343.275 3230.78 3458.3
Minami-Horoni Kyowa Town 335.180 3028.53 3458.3
Kounoura Takahama Town 330.353 2560.35 3461.04
Kyoudomarisaki Karatsu City 328.622 5009.4 3461.04
Horikappu Jinja Tomari Village 328.230 3134.71 3458.3
Hukada-kita Matsue City 327.031 2484.45 3461.04
Radiation dose in KEK, Tsukuba 326.240 3433.68
Herokaruusu Tomari Village 324.242 3251.02 3458.3
Yorita Satsuma-sendai City 323.218 2545.17 3461.04
Kamoenai Kamoenai Village 322.032 2745.41 3458.3
Radiation dose in Onagawa (MP-6) 316.267 3411.79
Imamura Genkai Town 314.749 42453.3 3461.04
Yamanaka Takahama Town 314.185 3304.17 3461.04
Sendai (Miyagi) 312.585 1553.77 3452.83
Radiation dose in Onagawa (MP-1) 300.147 3411.79
Gumisaki Satsuma-sendai City 295.693 2054.37 3461.04
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3433.68
Aomori Aomori City 285.372 2088.12 3458.3
Misawa City hall Misawa City 283.728 4049.86 3458.3
Kashu Ikata Town 277.173 2120.13 3461.04
Noheji Town Office Noheji Town 272.004 1789.82 3458.3
Takasimamati 271.103 2256.75 3461.04
Radiation dose in Onagawa (MP-3) 270.563 3411.79
Kucho Ikata Town 269.545 1872.21 3461.04
Radiation dose in Marumori 269.436 3414.53
Kawanagata Ikata Town 266.821 1826.67 3461.04
Tochigi 260.733 2029.3 3452.83
Chikagawa Mutu City 256.719 2330.81 3458.3
Yokohama Town Office Yokohama Town 254.846 2856.65 3458.3
Tokyo 251.877 2392.75 3452.83
Hiranuma Rokkasho Village 251.186 1875.77 3458.3
Taisei Ikata Town 246.293 1371.27 3461.04
Chitose-daira Rokkasho Village 245.868 2022.41 3458.3
Gifu 243.951 3331.68 3452.83
Fukkoshi Yokohama Town 243.102 1961.74 3458.3
Shimane 240.651 3331.68 3452.83
Sunagomata Higashidoori Village 238.012 2836.42 3458.3
Obuchi Rokkasho Village 237.506 2254.97 3458.3
Tomari Rokkasho Village 230.636 3154.94 3458.3
kanagawa 226.339 2089.87 3452.83
Saitama 219.770 1817.28 3452.83
Ikatagoshi Ikata Town 217.515 1725.45 3461.04
Touhoku Branch office Touhoku Town 215.416 1633.08 3458.3
Radiation dose at Tohoku University 214.824 3414.53
Odanosawa Higashidoori Village 210.287 2260.03 3458.3
Kagawa 205.829 2332.18 3452.83
Oippe Higashidoori Village 205.182 1946.57 3458.3
Oita 200.921 2574.48 3452.83
Touhoku Town office Touhoku Town 200.811 7553.66 3458.3
Kuchogoshi Ikata Town 198.646 1750.77 3461.04
Minatoura Ikata Town 186.776 1573.65 3461.04
Radiation dose in Koyadori, Ojika 184.905 3409.06
Toyama 184.580 4452.34 3452.83
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2147.04 3447.36
Radiation dose in Tukahama, Ojika 183.417 3409.06
Chiba 182.407 1332.67 3452.83
Nara 182.387 2423.04 3452.83
Okayama 181.976 3149.95 3452.83
Yamagata 181.598 2483.62 3452.83
Ehime 180.745 2241.31 3452.83
Ishikawa 180.445 3861.72 3452.83
Niigata 177.483 4634.06 3452.83
Hiroshima 176.816 2089.87 3452.83
Mie 174.867 2389.72 3452.83
Fukui 170.045 2937.94 3452.83
Radiation dose in Terama, Ojika 168.036 3409.06
Yamanashi 164.561 1938.43 3452.83
Nagano 162.242 2950.05 3452.83
Saga 161.421 2604.77 3452.83
Tottori 161.392 2392.75 3452.83
Radiation dose in Enoshima, Ojika 160.091 3409.06
Osaka 159.103 1847.57 3452.83
Ibaraki-city Environment 157.249 3368.02
Aichi 149.345 2241.31 3452.83
Toyonoura Ikata Town 149.214 1806.42 3461.04
Shizuoka 148.639 2317.03 3452.83
Kyoto 144.522 2635.06 3452.83
Kagoshima 144.449 2856.16 3452.83
Tokushima 143.627 2029.3 3452.83
Gunma 143.572 1362.96 3452.83
Hyogo 139.710 2301.89 3452.83
Fukuoka 136.511 2392.75 3452.83
Wakayama 133.857 1696.13 3452.83
Radiation at Tamaki-cho Mie Japan 133.138 3368.02
Akita 132.832 2604.77 3452.83
Shiga 124.919 1847.57 3452.83
Nagasaki 109.459 2089.87 3452.83
Hokkaido 109.189 3180.24 3452.83
Kumamoto 103.568 2029.3 3452.83
Aomori 101.819 3089.38 3452.83
Miyazaki 100.354 2011.12 3452.83
Kochi 95.931 2301.89 3452.83
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2138.52 3433.68
Iwate 90.324 2544.19 3452.83
Environment Feeds from Ohta 83.623 3368.02
Okinawa 82.305 1741.56 3452.83
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 Nuclear power plant

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