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Accumulated absorbed dose rate - T=13.03.2011 - 23.09.2014(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 3444.62
Fukushima I MP8 570942.000 3444.62
Fukushima I MP6 240668.000 3444.62
Yamada Futaba Town 176983.000 2518.72 3001.39
Fukushima I MP2 140420.000 3444.62
Fukushima I MP5 111325.000 3444.62
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2189.64 3515.76
Fukushima I MP3 93730.602 3444.62
Fukushima I MP4 86821.500 3444.62
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2189.64 3515.76
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2138.52 3433.68
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2189.64 3515.76
Ono Okuma Town 38610.500 2325.63 3001.39
Shinzan Futaba Town 38332.801 2110.64 3001.39
Fukushima I MP1 31496.801 3444.62
Yonomori Tomioka Town 29815.900 2404.62 3001.39
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2189.64 3515.76
Tomioka Tomioka Town 25324.500 2588.91 3001.39
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2189.64 3515.76
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2189.64 3515.76
Shimo-Kooriyama Tomioka Town 13057.000 2571.38 3001.39
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2189.64 3515.76
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2189.64 3515.76
Kami-kooriyama Tomioka Town 11803.900 2018.49 3001.39
Fukushima II MP3 11060.600 3444.62
Fukushima II MP1 10903.000 3444.62
Kooriyama Futaba Town 10352.900 2351.96 3001.39
Fukushima II MP4 9696.330 3444.62
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2186.23 3510.29
Fukushima II MP5 9382.150 3444.62
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2189.64 3515.76
Matsudate Naraha Town 8410.890 2746.88 3001.39
Shigeoka Naraha Town 8115.970 3036.49 3001.39
Fukushima II MP2 7875.320 3444.62
Namie Namie Town 7321.210 2215.95 3001.39
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3461.04
Fukushima II MP6 7062.690 3444.62
Fukushima II MP7 6511.580 3441.89
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2189.64 3515.76
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2189.64 3515.76
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2189.64 3515.76
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2189.64 3515.76
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2189.64 3515.76
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2189.64 3515.76
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2184.53 3507.55
Futatsunuma Hirono Town 3520.340 2632.8 3001.39
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2189.64 3515.76
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2189.64 3515.76
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3458.3
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2189.64 3515.76
Kiyohashi Namie Town 3162.000 1943.88 3001.39
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2184.53 3507.55
Radiation dose at Agricultural center, Koriyama 3128.960 3458.3
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2189.64 3515.76
Radiation dose at Koriyama city office, Koriyama 2803.520 3458.3
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2189.64 3515.76
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2184.53 3507.55
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2189.64 3515.76
Yamadaoka Naraha Town 2205.340 2334.42 3001.39
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3461.04
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2189.64 3515.76
Kuji Hitachi City 1990.890 5444.74 3526.7
Hitachinaka Hitachinaka City 1951.950 2390.52 3523.97
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2184.53 3507.55
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2184.53 3507.55
Momiyama Hokota City 1837.540 2727.53 3526.7
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2184.53 3507.55
Horiguchi Hitachinaka City 1779.410 2383.92 3529.44
Onuma Hitachi City 1776.950 2029.9 3523.97
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2189.64 3515.76
Tsukuriya Hokota City 1736.890 2294.43 3526.7
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3458.3
Nemoto Hitachioomiya City 1633.190 2555.4 3523.97
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2189.64 3515.76
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2189.64 3515.76
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3466.51
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2189.64 3515.76
Radiation dose at JAEA Oarai (P12) 1512.140 3482.93
Radiation dose at Ose administration center, Koriyama 1494.270 3458.3
Araji Hokota City 1437.760 2299.57 3526.7
Ishigami Tokai Village 1431.690 2093.35 3526.7
Mawatari Hitachinaka City 1422.870 2418.17 3526.7
Radiation dose at JAEA Oarai (P11) 1399.370 3482.93
Onuki Oarai Town 1387.990 2510.98 3526.7
Sawa Hitachinaka City 1353.770 1895.93 3523.97
Toyooka Tokai Village 1321.760 2304.73 3526.7
Ajigaura Hitachinaka City 1313.890 2266.87 3523.97
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2189.64 3515.76
Geiger Counter Feeds from Asao Kawasaki 1266.620 3436.42
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3458.3
Isohama Oarai Town 1250.540 2187.89 3521.23
Ebisawa Ibaraki Town 1222.240 5941.29 3523.97
Muramatsu Tokai Village 1203.520 2325.37 3526.7
Kamitoda Hokota City 1184.740 1907.73 3526.7
Yanagisawa Hitachinaka City 1166.970 1942.29 3523.97
Tokushuku Hokota City 1159.730 1722.11 3526.7
Tasaki Hokota City 1153.300 2029.47 3496.61
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2189.64 3515.76
Kadobe Naka City 1086.580 4626.51 3523.97
Radiation dose at Date city office, Date 1076.050 3461.04
Oshinobe Tokai Village 1041.340 2170.69 3526.7
Oba Mito City 1037.670 7130.75 3526.7
Godai Naka City 1031.270 1881.93 3526.7
Ishikawa Mito City 1030.810 2218.81 3529.44
Isobe Hitachiota City 1013.130 10703.9 3526.7
Yatabe Ibaraki Town 996.127 1861.33 3526.7
Radiation dose at Motomiya city office, Motomiya 992.703 3461.04
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2184.53 3507.55
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2184.53 3507.55
Yokobori Naka City 930.280 2180.99 3526.7
Sugaya Naka City 926.186 3333.37 3529.44
Kounosu Naka City 926.087 1701.48 3526.7
Funaishikawa Tokai Village 900.399 2258.33 3526.7
Nukada Naka City 899.900 2038.61 3521.23
Uridura Naka City 890.113 1945.94 3521.23
Shiraki Tsuruga City 881.330 4133.16 3529.44
Motokomezaki Naka City 880.851 1808.23 3493.87
Shiraki pass Tsuruga City 850.284 4329.23 3529.44
Radiation dose in Yamamoto 846.633 3482.93
Yoshizawa Mito City 837.646 1969.6 3526.7
Radiation dose at JAEA Oarai (P7) 831.135 3482.93
Mayumi Hitachiota City 828.119 1954.13 3526.7
Urasoko Tsuruga City 826.465 3431.39 3529.44
Nemoto Hitachioomiya City 825.588 2199.91 3523.97
Takenami Mihama Town 804.283 3601.67 3529.44
Radiation dose at JAEA Oarai (P15) 780.207 3482.93
Tateishi Tsuruga City 780.092 2853.49 3529.44
Radiation dose at JAEA Oarai (P14) 770.174 3482.93
Radiation dose at JAEA Oarai (P13) 769.612 3482.93
Ukishima Kawasaki Ward 735.475 6733.8 3529.44
Kume Hitachiota City 713.958 1912.87 3526.7
Radiation dose at JAEA Oarai (P2) 712.011 3482.93
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2184.53 3507.55
Nyuu Mihama Town 674.787 3281.76 3529.44
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2189.64 3515.76
Radiation dose in Iwanuma 670.242 3482.93
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2189.64 3515.76
Tsuruga Tsuruga City 655.360 2894.76 3529.44
Shiohama Kawasaki Ward 653.536 2311.69 3529.44
Radiation dose in Kakuda 649.863 3482.93
Sakajiri Mihama Town 649.252 3828.73 3529.44
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2404.57 3529.44
Radiation dose in Onagawa (MP-2) 632.968 3480.19
Kumatori town Nishi primary school Station 631.491 2874.11 3529.44
Oshima Kawasaki Ward 630.402 2203.33 3529.44
Izumisano municipal Oike athletic field Station 629.920 3240.49 3529.44
Atom-kyoudou nursery school Station 625.566 3111.48 3529.44
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2832.84 3529.44
Nakamachi Omaezaki City 623.494 3648.11 3529.44
Uraga Yokosuka City 622.492 1728.59 3529.44
Goritoge Shika Town 622.143 3875.17 3529.44
Kumatori town Minami primary school Station 606.134 3297.24 3529.44
Radiation dose at JAEA Oarai (P1) 603.643 3485.66
Yamanotedai-No.1 Park Station 599.140 3075.35 3529.44
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3502.08
Noumi Shika Town 594.021 3833.87 3529.44
Radiation dose in Watari 591.851 3482.93
Hairando Yokosuka City 588.667 2167.2 3529.44
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2189.64 3515.76
Ningyotoge Kagamino Town 574.857 3075.35 3529.44
Ten-no Kagamino Town 569.960 3684.24 3529.44
Funagura Yokosuka City 563.909 2043.36 3529.44
Chidori Kawasaki Ward 560.211 1976.27 3529.44
Radiation dose at JAEA Oarai (P16) 556.365 3482.93
Shika Shika Town 551.376 3694.55 3529.44
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2399.4 3529.44
Sahara Yokosuka City 547.404 1914.35 3529.44
Kazanashi Shika Town 545.377 3467.52 3529.44
Akasumi Shika Town 544.970 3173.4 3529.44
Kurahashi Maizuru City 540.820 2889.59 3529.44
Obama Obama City 540.809 2585.16 3529.44
Sakuragaike community hall Omaezaki City 540.772 3740.99 3529.44
Shirowa primary school Omaezaki City 535.692 3663.59 3529.44
Radiation dose at JAEA Oarai (P5) 529.759 3482.93
Uenohara Omaezaki City 529.333 3766.81 3529.44
Kumano Shika Town 529.019 3596.53 3529.44
Izumisano municipal Hineno filtration plant Station 527.471 3101.17 3529.44
Nishi-hamasada Matsue City 525.089 3425.72 3513.02
Kouno Minami-Echizen Town 525.028 2600.64 3529.44
Kurihama Yokosuka City 523.708 2069.15 3529.44
Osaka prefectural Kumatori off-site-center Station 522.808 2858.63 3529.44
Ogasa branch Kikugawa City 522.039 3803.59 3515.76
Izumisano municipal Hineno primary scool Station 518.181 2481.97 3529.44
Shirasuna Omaezaki City 499.479 3689.41 3529.44
Jitougata primary school Makinohara City 498.059 3539.75 3529.44
Kataku Matsue City 497.007 2750.27 3529.44
Nishihemi Yokosuka City 496.917 1651.19 3529.44
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3502.08
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2709 3529.44
Otomi Takahama Town 494.821 3034.08 3529.44
Otsu Nanao City 493.895 3044.39 3529.44
The Observation point for comparison Tatsunokuchi 493.454 2507.76 3529.44
Hitsuhama Ohi Town 492.630 2822.53 3529.44
Kijiyama Misasa Town 489.284 2863.8 3529.44
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3502.08
Hiraba Omaezaki City 485.878 3689.41 3529.44
Tayu Matsue City 484.956 2868.97 3529.44
Hamaokakita primary school Omaezaki City 484.537 3777.9 3515.76
Oitomi Ayabe City 474.670 3637.8 3529.44
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3502.08
Kashiwazaki-shigai Kashiwazaki City 470.822 2894.76 3529.44
Mitsu Matsue City 466.897 2745.13 3529.44
Tonomachi Kawasaki Ward 463.967 3477.83 3529.44
Daitou branch Kakegawa City 463.829 3721.37 3515.76
Fukura Shika Town 462.493 3462.35 3529.44
Nagasawa Yokosuka City 462.365 2022.71 3529.44
The athletic field Station of Kinki University 461.661 2285.87 3529.44
Koura Matsue City 461.049 3276.59 3529.44
Sakurasan Ward Omaezaki City 459.434 3570.71 3529.44
Tsuchikawa Nanao City 458.915 3369.47 3529.44
Kumatori Town office Station 457.917 2358.13 3529.44
Shinkango Omaezaki City 449.013 4133.16 3529.44
Ogurui Takahama Town 448.279 2703.83 3529.44
Kusabue Omaezaki City 444.162 3895.79 3529.44
Omaezaki City monitoring center 443.946 3823.56 3529.44
Akawase Kagamino Town 442.246 2358.13 3529.44
Ibaraki 442.139 1729.73 3521.23
Hinode Town Yokosuka City 438.324 1362.24 3529.44
Nishiyama Kashiwazaki City 437.251 4097.03 3529.44
Kariwa Kariwa Village 436.307 3090.83 3529.44
Osaka prefectural Hineno high scool Station 435.745 2755.44 3529.44
Miyagawa Kashiwazaki City 435.245 3049.56 3529.44
Radiation dose in Natori 434.640 3482.93
Kami-koubu Matsue City 433.868 2997.95 3529.44
Shimo-Takamachi Kariwa Village 433.192 3364.33 3529.44
Osaka prefectural Sano supporting school Station 432.398 3003.12 3529.44
Arahama Kashiwazaki City 428.874 3142.44 3529.44
Doai Kashiwazaki City 425.681 2956.68 3529.44
Owashi Matsue City 424.452 2930.89 3529.44
Okayasu Maizuru City 422.568 3452.04 3529.44
Katsuyama Kariwa Village 421.280 3142.44 3529.44
Kita-koubu Matsue City 420.683 3214.67 3529.44
Kichisaka Maizuru City 413.065 4195.08 3529.44
Nagai Ohi Town 410.699 3047.63 3521.23
Shiokumi Maizuru City 407.938 5221.93 3529.44
Miyadome Ohi Town 407.831 2528.41 3529.44
Kariwa Kariwa Village 407.617 3255.97 3529.44
Ueno Satsuma-sendai City 394.248 2363.27 3529.44
Power Station-South 389.191 3441.73 3529.44
Radiation dose at JAEA Oarai (P6) 386.963 3482.93
Power Station- 385.546 3359.16 3529.44
Takae Satsuma-sendai City 379.551 2394.23 3529.44
Hokawaduura Genkai Town 378.015 3645.54 3529.44
Kou Itimatsu Suetsugu 377.929 2631.6 3529.44
Minato Satsuma-sendai City 377.656 2192.99 3529.44
Iwanai Iwanai Town 376.336 3573.11 3526.7
Hattari Kyowa Town 373.047 3475.13 3526.7
Chatsu Tomari Village 371.011 3320.45 3526.7
Oyama Maizuru City 358.223 3023.77 3529.44
Kodaira Satsuma-sendai City 355.545 2218.81 3529.44
Kayanuma Tomari Village 354.809 2954.39 3526.7
Anojiri Obama City 353.215 2476.8 3529.44
Kushi Genkai Town 349.738 5031 3529.44
Yamaguchi 348.715 3953.66 3521.23
Sadahongou Matsue City 348.228 3080.52 3529.44
Sakibe Karatsu City 347.801 4767.84 3529.44
Hirao Genkai Town 343.814 5025.83 3529.44
The Meteorological Obsevatory of kyowa Town 343.275 3294.68 3526.7
Minami-Horoni Kyowa Town 335.180 3088.43 3526.7
Kounoura Takahama Town 330.353 2610.95 3529.44
Kyoudomarisaki Karatsu City 328.622 5108.4 3529.44
Horikappu Jinja Tomari Village 328.230 3196.71 3526.7
Hukada-kita Matsue City 327.031 2533.55 3529.44
Radiation dose in KEK, Tsukuba 326.240 3502.08
Herokaruusu Tomari Village 324.242 3315.32 3526.7
Yorita Satsuma-sendai City 323.218 2595.47 3529.44
Kamoenai Kamoenai Village 322.032 2799.71 3526.7
Radiation dose in Onagawa (MP-6) 316.267 3480.19
Imamura Genkai Town 314.749 43292.3 3529.44
Yamanaka Takahama Town 314.185 3369.47 3529.44
Sendai (Miyagi) 312.585 1584.55 3521.23
Radiation dose in Onagawa (MP-1) 300.147 3480.19
Gumisaki Satsuma-sendai City 295.693 2094.97 3529.44
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3502.08
Aomori Aomori City 285.372 2129.42 3526.7
Misawa City hall Misawa City 283.728 4129.96 3526.7
Kashu Ikata Town 277.173 2162.03 3529.44
Noheji Town Office Noheji Town 272.004 1825.22 3526.7
Takasimamati 271.103 2301.35 3529.44
Radiation dose in Onagawa (MP-3) 270.563 3480.19
Kucho Ikata Town 269.545 1909.21 3529.44
Radiation dose in Marumori 269.436 3482.93
Kawanagata Ikata Town 266.821 1862.77 3529.44
Tochigi 260.733 2069.5 3521.23
Chikagawa Mutu City 256.719 2376.91 3526.7
Yokohama Town Office Yokohama Town 254.846 2913.15 3526.7
Tokyo 251.877 2440.15 3521.23
Hiranuma Rokkasho Village 251.186 1912.87 3526.7
Taisei Ikata Town 246.293 1398.37 3529.44
Chitose-daira Rokkasho Village 245.868 2062.41 3526.7
Gifu 243.951 3397.68 3521.23
Fukkoshi Yokohama Town 243.102 2000.54 3526.7
Shimane 240.651 3397.68 3521.23
Sunagomata Higashidoori Village 238.012 2892.52 3526.7
Obuchi Rokkasho Village 237.506 2299.57 3526.7
Tomari Rokkasho Village 230.636 3217.34 3526.7
kanagawa 226.339 2131.27 3521.23
Saitama 219.770 1853.28 3521.23
Ikatagoshi Ikata Town 217.515 1759.55 3529.44
Touhoku Branch office Touhoku Town 215.416 1665.38 3526.7
Radiation dose at Tohoku University 214.824 3482.93
Odanosawa Higashidoori Village 210.287 2304.73 3526.7
Kagawa 205.829 2378.38 3521.23
Oippe Higashidoori Village 205.182 1985.07 3526.7
Oita 200.921 2625.48 3521.23
Touhoku Town office Touhoku Town 200.811 7703.06 3526.7
Kuchogoshi Ikata Town 198.646 1785.37 3529.44
Minatoura Ikata Town 186.776 1604.75 3529.44
Radiation dose in Koyadori, Ojika 184.905 3477.46
Toyama 184.580 4540.54 3521.23
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2189.64 3515.76
Radiation dose in Tukahama, Ojika 183.417 3477.46
Chiba 182.407 1359.07 3521.23
Nara 182.387 2471.04 3521.23
Okayama 181.976 3212.35 3521.23
Yamagata 181.598 2532.82 3521.23
Ehime 180.745 2285.71 3521.23
Ishikawa 180.445 3938.22 3521.23
Niigata 177.483 4725.86 3521.23
Hiroshima 176.816 2131.27 3521.23
Mie 174.867 2437.06 3521.23
Fukui 170.045 2996.14 3521.23
Radiation dose in Terama, Ojika 168.036 3477.46
Yamanashi 164.561 1976.83 3521.23
Nagano 162.242 3008.49 3521.23
Saga 161.421 2656.37 3521.23
Tottori 161.392 2440.15 3521.23
Radiation dose in Enoshima, Ojika 160.091 3477.46
Osaka 159.103 1884.17 3521.23
Ibaraki-city Environment 157.249 3436.42
Aichi 149.345 2285.71 3521.23
Toyonoura Ikata Town 149.214 1842.12 3529.44
Shizuoka 148.639 2362.93 3521.23
Kyoto 144.522 2687.26 3521.23
Kagoshima 144.449 2912.74 3521.23
Tokushima 143.627 2069.5 3521.23
Gunma 143.572 1389.96 3521.23
Hyogo 139.710 2347.49 3521.23
Fukuoka 136.511 2440.15 3521.23
Wakayama 133.857 1729.73 3521.23
Radiation at Tamaki-cho Mie Japan 133.138 3436.42
Akita 132.832 2656.37 3521.23
Shiga 124.919 1884.17 3521.23
Nagasaki 109.459 2131.27 3521.23
Hokkaido 109.189 3243.24 3521.23
Kumamoto 103.568 2069.5 3521.23
Aomori 101.819 3150.58 3521.23
Miyazaki 100.354 2050.96 3521.23
Kochi 95.931 2347.49 3521.23
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2181.12 3502.08
Iwate 90.324 2594.59 3521.23
Environment Feeds from Ohta 83.623 3436.42
Okinawa 82.305 1776.06 3521.23
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