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Accumulated absorbed dose rate - T=13.03.2011 - 28.07.2014(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 3288.67
Fukushima I MP8 570942.000 3288.67
Fukushima I MP6 240668.000 3288.67
Yamada Futaba Town 176983.000 2387.85 2845.44
Fukushima I MP2 140420.000 3288.67
Fukushima I MP5 111325.000 3288.67
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2092.51 3359.81
Fukushima I MP3 93730.602 3288.67
Fukushima I MP4 86821.500 3288.67
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2092.51 3359.81
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2041.39 3277.73
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2092.51 3359.81
Ono Okuma Town 38610.500 2204.79 2845.44
Shinzan Futaba Town 38332.801 2000.97 2845.44
Fukushima I MP1 31496.801 3288.67
Yonomori Tomioka Town 29815.900 2279.67 2845.44
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2092.51 3359.81
Tomioka Tomioka Town 25324.500 2454.39 2845.44
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2092.51 3359.81
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2092.51 3359.81
Shimo-Kooriyama Tomioka Town 13057.000 2437.77 2845.44
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2092.51 3359.81
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2092.51 3359.81
Kami-kooriyama Tomioka Town 11803.900 1913.61 2845.44
Fukushima II MP3 11060.600 3288.67
Fukushima II MP1 10903.000 3288.67
Kooriyama Futaba Town 10352.900 2229.75 2845.44
Fukushima II MP4 9696.330 3288.67
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2089.1 3354.34
Fukushima II MP5 9382.150 3288.67
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2092.51 3359.81
Matsudate Naraha Town 8410.890 2604.15 2845.44
Shigeoka Naraha Town 8115.970 2878.71 2845.44
Fukushima II MP2 7875.320 3288.67
Namie Namie Town 7321.210 2100.81 2845.44
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3305.09
Fukushima II MP6 7062.690 3288.67
Fukushima II MP7 6511.580 3285.94
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2092.51 3359.81
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2092.51 3359.81
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2092.51 3359.81
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2092.51 3359.81
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2092.51 3359.81
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2092.51 3359.81
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2087.4 3351.6
Futatsunuma Hirono Town 3520.340 2496 2845.44
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2092.51 3359.81
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2092.51 3359.81
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3302.35
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2092.51 3359.81
Kiyohashi Namie Town 3162.000 1842.87 2845.44
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2087.4 3351.6
Radiation dose at Agricultural center, Koriyama 3128.960 3302.35
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2092.51 3359.81
Radiation dose at Koriyama city office, Koriyama 2803.520 3302.35
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2092.51 3359.81
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2087.4 3351.6
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2092.51 3359.81
Yamadaoka Naraha Town 2205.340 2213.13 2845.44
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3305.09
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2092.51 3359.81
Kuji Hitachi City 1990.890 5203.97 3370.75
Hitachinaka Hitachinaka City 1951.950 2284.73 3368.02
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2087.4 3351.6
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2087.4 3351.6
Momiyama Hokota City 1837.540 2606.92 3370.75
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2087.4 3351.6
Horiguchi Hitachinaka City 1779.410 2278.58 3373.49
Onuma Hitachi City 1776.950 1940.07 3368.02
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2092.51 3359.81
Tsukuriya Hokota City 1736.890 2192.97 3370.75
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3302.35
Nemoto Hitachioomiya City 1633.190 2442.31 3368.02
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2092.51 3359.81
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2092.51 3359.81
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3310.56
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2092.51 3359.81
Radiation dose at JAEA Oarai (P12) 1512.140 3326.98
Radiation dose at Ose administration center, Koriyama 1494.270 3302.35
Araji Hokota City 1437.760 2197.88 3370.75
Ishigami Tokai Village 1431.690 2000.78 3370.75
Mawatari Hitachinaka City 1422.870 2311.24 3370.75
Radiation dose at JAEA Oarai (P11) 1399.370 3326.98
Onuki Oarai Town 1387.990 2399.95 3370.75
Sawa Hitachinaka City 1353.770 1812.02 3368.02
Toyooka Tokai Village 1321.760 2202.82 3370.75
Ajigaura Hitachinaka City 1313.890 2166.55 3368.02
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2092.51 3359.81
Geiger Counter Feeds from Asao Kawasaki 1266.620 3280.46
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3302.35
Isohama Oarai Town 1250.540 2090.99 3365.28
Ebisawa Ibaraki Town 1222.240 5678.36 3368.02
Muramatsu Tokai Village 1203.520 2222.54 3370.75
Kamitoda Hokota City 1184.740 1823.37 3370.75
Yanagisawa Hitachinaka City 1166.970 1856.34 3368.02
Tokushuku Hokota City 1159.730 1645.96 3370.75
Tasaki Hokota City 1153.300 1938.96 3340.66
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2092.51 3359.81
Kadobe Naka City 1086.580 4421.76 3368.02
Radiation dose at Date city office, Date 1076.050 3305.09
Oshinobe Tokai Village 1041.340 2074.7 3370.75
Oba Mito City 1037.670 6815.42 3370.75
Godai Naka City 1031.270 1798.71 3370.75
Ishikawa Mito City 1030.810 2120.77 3373.49
Isobe Hitachiota City 1013.130 10230.5 3370.75
Yatabe Ibaraki Town 996.127 1779.02 3370.75
Radiation dose at Motomiya city office, Motomiya 992.703 3305.09
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2087.4 3351.6
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2087.4 3351.6
Yokobori Naka City 930.280 2084.54 3370.75
Sugaya Naka City 926.186 3186.08 3373.49
Kounosu Naka City 926.087 1626.24 3370.75
Funaishikawa Tokai Village 900.399 2158.46 3370.75
Nukada Naka City 899.900 1948.32 3365.28
Uridura Naka City 890.113 1859.76 3365.28
Shiraki Tsuruga City 881.330 3950.53 3373.49
Motokomezaki Naka City 880.851 1727.52 3337.92
Shiraki pass Tsuruga City 850.284 4137.94 3373.49
Radiation dose in Yamamoto 846.633 3326.98
Yoshizawa Mito City 837.646 1882.51 3370.75
Radiation dose at JAEA Oarai (P7) 831.135 3326.98
Mayumi Hitachiota City 828.119 1867.72 3370.75
Urasoko Tsuruga City 826.465 3279.77 3373.49
Nemoto Hitachioomiya City 825.588 2102.56 3368.02
Takenami Mihama Town 804.283 3442.53 3373.49
Radiation dose at JAEA Oarai (P15) 780.207 3326.98
Tateishi Tsuruga City 780.092 2727.41 3373.49
Radiation dose at JAEA Oarai (P14) 770.174 3326.98
Radiation dose at JAEA Oarai (P13) 769.612 3326.98
Ukishima Kawasaki Ward 735.475 6436.26 3373.49
Kume Hitachiota City 713.958 1828.28 3370.75
Radiation dose at JAEA Oarai (P2) 712.011 3326.98
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2087.4 3351.6
Nyuu Mihama Town 674.787 3136.75 3373.49
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2092.51 3359.81
Radiation dose in Iwanuma 670.242 3326.98
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2092.51 3359.81
Tsuruga Tsuruga City 655.360 2766.85 3373.49
Shiohama Kawasaki Ward 653.536 2209.55 3373.49
Radiation dose in Kakuda 649.863 3326.98
Sakajiri Mihama Town 649.252 3659.55 3373.49
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2298.32 3373.49
Radiation dose in Onagawa (MP-2) 632.968 3324.24
Kumatori town Nishi primary school Station 631.491 2747.11 3373.49
Oshima Kawasaki Ward 630.402 2105.97 3373.49
Izumisano municipal Oike athletic field Station 629.920 3097.31 3373.49
Atom-kyoudou nursery school Station 625.566 2974 3373.49
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2707.67 3373.49
Nakamachi Omaezaki City 623.494 3486.91 3373.49
Uraga Yokosuka City 622.492 1652.21 3373.49
Goritoge Shika Town 622.143 3703.94 3373.49
Kumatori town Minami primary school Station 606.134 3151.55 3373.49
Radiation dose at JAEA Oarai (P1) 603.643 3329.71
Yamanotedai-No.1 Park Station 599.140 2939.46 3373.49
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3346.13
Noumi Shika Town 594.021 3664.47 3373.49
Radiation dose in Watari 591.851 3326.98
Hairando Yokosuka City 588.667 2071.44 3373.49
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2092.51 3359.81
Ningyotoge Kagamino Town 574.857 2939.46 3373.49
Ten-no Kagamino Town 569.960 3521.45 3373.49
Funagura Yokosuka City 563.909 1953.07 3373.49
Chidori Kawasaki Ward 560.211 1888.95 3373.49
Radiation dose at JAEA Oarai (P16) 556.365 3326.98
Shika Shika Town 551.376 3531.3 3373.49
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2293.38 3373.49
Sahara Yokosuka City 547.404 1829.76 3373.49
Kazanashi Shika Town 545.377 3314.3 3373.49
Akasumi Shika Town 544.970 3033.18 3373.49
Kurahashi Maizuru City 540.820 2761.91 3373.49
Obama Obama City 540.809 2470.93 3373.49
Sakuragaike community hall Omaezaki City 540.772 3575.69 3373.49
Shirowa primary school Omaezaki City 535.692 3501.71 3373.49
Radiation dose at JAEA Oarai (P5) 529.759 3326.98
Uenohara Omaezaki City 529.333 3600.37 3373.49
Kumano Shika Town 529.019 3437.61 3373.49
Izumisano municipal Hineno filtration plant Station 527.471 2964.14 3373.49
Nishi-hamasada Matsue City 525.089 3273.65 3357.07
Kouno Minami-Echizen Town 525.028 2485.73 3373.49
Kurihama Yokosuka City 523.708 1977.72 3373.49
Osaka prefectural Kumatori off-site-center Station 522.808 2732.32 3373.49
Ogasa branch Kikugawa City 522.039 3634.87 3359.81
Izumisano municipal Hineno primary scool Station 518.181 2372.3 3373.49
Shirasuna Omaezaki City 499.479 3526.39 3373.49
Jitougata primary school Makinohara City 498.059 3383.34 3373.49
Kataku Matsue City 497.007 2628.75 3373.49
Nishihemi Yokosuka City 496.917 1578.23 3373.49
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3346.13
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2589.3 3373.49
Otomi Takahama Town 494.821 2900.02 3373.49
Otsu Nanao City 493.895 2909.87 3373.49
The Observation point for comparison Tatsunokuchi 493.454 2396.95 3373.49
Hitsuhama Ohi Town 492.630 2697.81 3373.49
Kijiyama Misasa Town 489.284 2737.26 3373.49
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3346.13
Hiraba Omaezaki City 485.878 3526.39 3373.49
Tayu Matsue City 484.956 2742.2 3373.49
Hamaokakita primary school Omaezaki City 484.537 3610.32 3359.81
Oitomi Ayabe City 474.670 3477.06 3373.49
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3346.13
Kashiwazaki-shigai Kashiwazaki City 470.822 2766.85 3373.49
Mitsu Matsue City 466.897 2623.83 3373.49
Tonomachi Kawasaki Ward 463.967 3324.16 3373.49
Daitou branch Kakegawa City 463.829 3556.3 3359.81
Fukura Shika Town 462.493 3309.36 3373.49
Nagasawa Yokosuka City 462.365 1933.33 3373.49
The athletic field Station of Kinki University 461.661 2184.87 3373.49
Koura Matsue City 461.049 3131.81 3373.49
Sakurasan Ward Omaezaki City 459.434 3412.93 3373.49
Tsuchikawa Nanao City 458.915 3220.59 3373.49
Kumatori Town office Station 457.917 2253.93 3373.49
Shinkango Omaezaki City 449.013 3950.53 3373.49
Ogurui Takahama Town 448.279 2584.36 3373.49
Kusabue Omaezaki City 444.162 3723.65 3373.49
Omaezaki City monitoring center 443.946 3654.61 3373.49
Akawase Kagamino Town 442.246 2253.93 3373.49
Ibaraki 442.139 1653.12 3365.28
Hinode Town Yokosuka City 438.324 1302.05 3373.49
Nishiyama Kashiwazaki City 437.251 3916 3373.49
Kariwa Kariwa Village 436.307 2954.26 3373.49
Osaka prefectural Hineno high scool Station 435.745 2633.69 3373.49
Miyagawa Kashiwazaki City 435.245 2914.81 3373.49
Radiation dose in Natori 434.640 3326.98
Kami-koubu Matsue City 433.868 2865.48 3373.49
Shimo-Takamachi Kariwa Village 433.192 3215.67 3373.49
Osaka prefectural Sano supporting school Station 432.398 2870.42 3373.49
Arahama Kashiwazaki City 428.874 3003.59 3373.49
Doai Kashiwazaki City 425.681 2826.04 3373.49
Owashi Matsue City 424.452 2801.39 3373.49
Okayasu Maizuru City 422.568 3299.51 3373.49
Katsuyama Kariwa Village 421.280 3003.59 3373.49
Kita-koubu Matsue City 420.683 3072.63 3373.49
Kichisaka Maizuru City 413.065 4009.72 3373.49
Nagai Ohi Town 410.699 2912.65 3365.28
Shiokumi Maizuru City 407.938 4991.19 3373.49
Miyadome Ohi Town 407.831 2416.69 3373.49
Kariwa Kariwa Village 407.617 3112.1 3373.49
Ueno Satsuma-sendai City 394.248 2258.85 3373.49
Power Station-South 389.191 3289.65 3373.49
Radiation dose at JAEA Oarai (P6) 386.963 3326.98
Power Station- 385.546 3210.73 3373.49
Takae Satsuma-sendai City 379.551 2288.44 3373.49
Hokawaduura Genkai Town 378.015 3484.46 3373.49
Kou Itimatsu Suetsugu 377.929 2515.32 3373.49
Minato Satsuma-sendai City 377.656 2096.09 3373.49
Iwanai Iwanai Town 376.336 3415.1 3370.75
Hattari Kyowa Town 373.047 3321.46 3370.75
Chatsu Tomari Village 371.011 3173.62 3370.75
Oyama Maizuru City 358.223 2890.16 3373.49
Kodaira Satsuma-sendai City 355.545 2120.77 3373.49
Kayanuma Tomari Village 354.809 2823.74 3370.75
Anojiri Obama City 353.215 2367.36 3373.49
Kushi Genkai Town 349.738 4808.7 3373.49
Yamaguchi 348.715 3778.56 3365.28
Sadahongou Matsue City 348.228 2944.4 3373.49
Sakibe Karatsu City 347.801 4557.17 3373.49
Hirao Genkai Town 343.814 4803.76 3373.49
The Meteorological Obsevatory of kyowa Town 343.275 3148.99 3370.75
Minami-Horoni Kyowa Town 335.180 2951.86 3370.75
Kounoura Takahama Town 330.353 2495.58 3373.49
Kyoudomarisaki Karatsu City 328.622 4882.68 3373.49
Horikappu Jinja Tomari Village 328.230 3055.35 3370.75
Hukada-kita Matsue City 327.031 2421.6 3373.49
Radiation dose in KEK, Tsukuba 326.240 3346.13
Herokaruusu Tomari Village 324.242 3168.71 3370.75
Yorita Satsuma-sendai City 323.218 2480.79 3373.49
Kamoenai Kamoenai Village 322.032 2675.9 3370.75
Radiation dose in Onagawa (MP-6) 316.267 3324.24
Imamura Genkai Town 314.749 41379.4 3373.49
Yamanaka Takahama Town 314.185 3220.59 3373.49
Sendai (Miyagi) 312.585 1514.38 3365.28
Radiation dose in Onagawa (MP-1) 300.147 3324.24
Gumisaki Satsuma-sendai City 295.693 2002.4 3373.49
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3346.13
Aomori Aomori City 285.372 2035.25 3370.75
Misawa City hall Misawa City 283.728 3947.33 3370.75
Kashu Ikata Town 277.173 2066.5 3373.49
Noheji Town Office Noheji Town 272.004 1744.51 3370.75
Takasimamati 271.103 2199.66 3373.49
Radiation dose in Onagawa (MP-3) 270.563 3324.24
Kucho Ikata Town 269.545 1824.85 3373.49
Radiation dose in Marumori 269.436 3326.98
Kawanagata Ikata Town 266.821 1780.46 3373.49
Tochigi 260.733 1977.84 3365.28
Chikagawa Mutu City 256.719 2271.8 3370.75
Yokohama Town Office Yokohama Town 254.846 2784.33 3370.75
Tokyo 251.877 2332.08 3365.28
Hiranuma Rokkasho Village 251.186 1828.28 3370.75
Taisei Ikata Town 246.293 1336.58 3373.49
Chitose-daira Rokkasho Village 245.868 1971.21 3370.75
Gifu 243.951 3247.2 3365.28
Fukkoshi Yokohama Town 243.102 1912.07 3370.75
Shimane 240.651 3247.2 3365.28
Sunagomata Higashidoori Village 238.012 2764.61 3370.75
Obuchi Rokkasho Village 237.506 2197.88 3370.75
Tomari Rokkasho Village 230.636 3075.07 3370.75
kanagawa 226.339 2036.88 3365.28
Saitama 219.770 1771.2 3365.28
Ikatagoshi Ikata Town 217.515 1681.8 3373.49
Touhoku Branch office Touhoku Town 215.416 1591.73 3370.75
Radiation dose at Tohoku University 214.824 3326.98
Odanosawa Higashidoori Village 210.287 2202.82 3370.75
Kagawa 205.829 2273.04 3365.28
Oippe Higashidoori Village 205.182 1897.29 3370.75
Oita 200.921 2509.2 3365.28
Touhoku Town office Touhoku Town 200.811 7362.43 3370.75
Kuchogoshi Ikata Town 198.646 1706.48 3373.49
Minatoura Ikata Town 186.776 1533.84 3373.49
Radiation dose in Koyadori, Ojika 184.905 3321.5
Toyama 184.580 4339.44 3365.28
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2092.51 3359.81
Radiation dose in Tukahama, Ojika 183.417 3321.5
Chiba 182.407 1298.88 3365.28
Nara 182.387 2361.6 3365.28
Okayama 181.976 3070.08 3365.28
Yamagata 181.598 2420.64 3365.28
Ehime 180.745 2184.48 3365.28
Ishikawa 180.445 3763.8 3365.28
Niigata 177.483 4516.56 3365.28
Hiroshima 176.816 2036.88 3365.28
Mie 174.867 2329.13 3365.28
Fukui 170.045 2863.44 3365.28
Radiation dose in Terama, Ojika 168.036 3321.5
Yamanashi 164.561 1889.28 3365.28
Nagano 162.242 2875.25 3365.28
Saga 161.421 2538.72 3365.28
Tottori 161.392 2332.08 3365.28
Radiation dose in Enoshima, Ojika 160.091 3321.5
Osaka 159.103 1800.72 3365.28
Ibaraki-city Environment 157.249 3280.46
Aichi 149.345 2184.48 3365.28
Toyonoura Ikata Town 149.214 1760.72 3373.49
Shizuoka 148.639 2258.28 3365.28
Kyoto 144.522 2568.24 3365.28
Kagoshima 144.449 2783.74 3365.28
Tokushima 143.627 1977.84 3365.28
Gunma 143.572 1328.4 3365.28
Hyogo 139.710 2243.52 3365.28
Fukuoka 136.511 2332.08 3365.28
Wakayama 133.857 1653.12 3365.28
Radiation at Tamaki-cho Mie Japan 133.138 3280.46
Akita 132.832 2538.72 3365.28
Shiga 124.919 1800.72 3365.28
Nagasaki 109.459 2036.88 3365.28
Hokkaido 109.189 3099.6 3365.28
Kumamoto 103.568 1977.84 3365.28
Aomori 101.819 3011.04 3365.28
Miyazaki 100.354 1960.13 3365.28
Kochi 95.931 2243.52 3365.28
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2083.99 3346.13
Iwate 90.324 2479.68 3365.28
Environment Feeds from Ohta 83.623 3280.46
Okinawa 82.305 1697.4 3365.28
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