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Accumulated absorbed dose rate - T=13.03.2011 - 23.10.2014(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 3526.7
Fukushima I MP8 570942.000 3526.7
Fukushima I MP6 240668.000 3526.7
Yamada Futaba Town 176983.000 2587.6 3083.47
Fukushima I MP2 140420.000 3526.7
Fukushima I MP5 111325.000 3526.7
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2240.76 3597.84
Fukushima I MP3 93730.602 3526.7
Fukushima I MP4 86821.500 3526.7
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2240.76 3597.84
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2189.64 3515.76
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2240.76 3597.84
Ono Okuma Town 38610.500 2389.23 3083.47
Shinzan Futaba Town 38332.801 2168.36 3083.47
Fukushima I MP1 31496.801 3526.7
Yonomori Tomioka Town 29815.900 2470.38 3083.47
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2240.76 3597.84
Tomioka Tomioka Town 25324.500 2659.71 3083.47
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2240.76 3597.84
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2240.76 3597.84
Shimo-Kooriyama Tomioka Town 13057.000 2641.7 3083.47
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2240.76 3597.84
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2240.76 3597.84
Kami-kooriyama Tomioka Town 11803.900 2073.69 3083.47
Fukushima II MP3 11060.600 3526.7
Fukushima II MP1 10903.000 3526.7
Kooriyama Futaba Town 10352.900 2416.28 3083.47
Fukushima II MP4 9696.330 3526.7
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2237.35 3592.37
Fukushima II MP5 9382.150 3526.7
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2240.76 3597.84
Matsudate Naraha Town 8410.890 2822 3083.47
Shigeoka Naraha Town 8115.970 3119.53 3083.47
Fukushima II MP2 7875.320 3526.7
Namie Namie Town 7321.210 2276.55 3083.47
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3543.12
Fukushima II MP6 7062.690 3526.7
Fukushima II MP7 6511.580 3523.97
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2240.76 3597.84
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2240.76 3597.84
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2240.76 3597.84
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2240.76 3597.84
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2240.76 3597.84
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2240.76 3597.84
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2235.65 3589.63
Futatsunuma Hirono Town 3520.340 2704.8 3083.47
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2240.76 3597.84
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2240.76 3597.84
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3540.38
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2240.76 3597.84
Kiyohashi Namie Town 3162.000 1997.04 3083.47
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2235.65 3589.63
Radiation dose at Agricultural center, Koriyama 3128.960 3540.38
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2240.76 3597.84
Radiation dose at Koriyama city office, Koriyama 2803.520 3540.38
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2240.76 3597.84
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2235.65 3589.63
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2240.76 3597.84
Yamadaoka Naraha Town 2205.340 2398.26 3083.47
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3543.12
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2240.76 3597.84
Kuji Hitachi City 1990.890 5571.46 3608.78
Hitachinaka Hitachinaka City 1951.950 2446.2 3606.05
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2235.65 3589.63
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2235.65 3589.63
Momiyama Hokota City 1837.540 2791.01 3608.78
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2235.65 3589.63
Horiguchi Hitachinaka City 1779.410 2439.36 3611.52
Onuma Hitachi City 1776.950 2077.18 3606.05
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2240.76 3597.84
Tsukuriya Hokota City 1736.890 2347.83 3608.78
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3540.38
Nemoto Hitachioomiya City 1633.190 2614.92 3606.05
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2240.76 3597.84
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2240.76 3597.84
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3548.59
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2240.76 3597.84
Radiation dose at JAEA Oarai (P12) 1512.140 3565.01
Radiation dose at Ose administration center, Koriyama 1494.270 3540.38
Araji Hokota City 1437.760 2353.09 3608.78
Ishigami Tokai Village 1431.690 2142.07 3608.78
Mawatari Hitachinaka City 1422.870 2474.45 3608.78
Radiation dose at JAEA Oarai (P11) 1399.370 3565.01
Onuki Oarai Town 1387.990 2569.42 3608.78
Sawa Hitachinaka City 1353.770 1940.09 3606.05
Toyooka Tokai Village 1321.760 2358.37 3608.78
Ajigaura Hitachinaka City 1313.890 2319.67 3606.05
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2240.76 3597.84
Geiger Counter Feeds from Asao Kawasaki 1266.620 3518.5
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3540.38
Isohama Oarai Town 1250.540 2238.89 3603.31
Ebisawa Ibaraki Town 1222.240 6079.67 3606.05
Muramatsu Tokai Village 1203.520 2379.49 3608.78
Kamitoda Hokota City 1184.740 1952.13 3608.78
Yanagisawa Hitachinaka City 1166.970 1987.53 3606.05
Tokushuku Hokota City 1159.730 1762.19 3608.78
Tasaki Hokota City 1153.300 2077.11 3578.69
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2240.76 3597.84
Kadobe Naka City 1086.580 4734.27 3606.05
Radiation dose at Date city office, Date 1076.050 3543.12
Oshinobe Tokai Village 1041.340 2221.21 3608.78
Oba Mito City 1037.670 7296.71 3608.78
Godai Naka City 1031.270 1925.73 3608.78
Ishikawa Mito City 1030.810 2270.41 3611.52
Isobe Hitachiota City 1013.130 10953 3608.78
Yatabe Ibaraki Town 996.127 1904.65 3608.78
Radiation dose at Motomiya city office, Motomiya 992.703 3543.12
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2235.65 3589.63
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2235.65 3589.63
Yokobori Naka City 930.280 2231.75 3608.78
Sugaya Naka City 926.186 3410.89 3611.52
Kounosu Naka City 926.087 1741.08 3608.78
Funaishikawa Tokai Village 900.399 2310.89 3608.78
Nukada Naka City 899.900 2086.13 3603.31
Uridura Naka City 890.113 1991.3 3603.31
Shiraki Tsuruga City 881.330 4229.28 3611.52
Motokomezaki Naka City 880.851 1850.71 3575.95
Shiraki pass Tsuruga City 850.284 4429.91 3611.52
Radiation dose in Yamamoto 846.633 3565.01
Yoshizawa Mito City 837.646 2015.44 3608.78
Radiation dose at JAEA Oarai (P7) 831.135 3565.01
Mayumi Hitachiota City 828.119 1999.61 3608.78
Urasoko Tsuruga City 826.465 3511.19 3611.52
Nemoto Hitachioomiya City 825.588 2251.15 3606.05
Takenami Mihama Town 804.283 3685.43 3611.52
Radiation dose at JAEA Oarai (P15) 780.207 3565.01
Tateishi Tsuruga City 780.092 2919.85 3611.52
Radiation dose at JAEA Oarai (P14) 770.174 3565.01
Radiation dose at JAEA Oarai (P13) 769.612 3565.01
Ukishima Kawasaki Ward 735.475 6890.4 3611.52
Kume Hitachiota City 713.958 1957.39 3608.78
Radiation dose at JAEA Oarai (P2) 712.011 3565.01
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2235.65 3589.63
Nyuu Mihama Town 674.787 3358.08 3611.52
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2240.76 3597.84
Radiation dose in Iwanuma 670.242 3565.01
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2240.76 3597.84
Tsuruga Tsuruga City 655.360 2962.08 3611.52
Shiohama Kawasaki Ward 653.536 2365.45 3611.52
Radiation dose in Kakuda 649.863 3565.01
Sakajiri Mihama Town 649.252 3917.77 3611.52
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2460.49 3611.52
Radiation dose in Onagawa (MP-2) 632.968 3562.27
Kumatori town Nishi primary school Station 631.491 2940.95 3611.52
Oshima Kawasaki Ward 630.402 2254.57 3611.52
Izumisano municipal Oike athletic field Station 629.920 3315.85 3611.52
Atom-kyoudou nursery school Station 625.566 3183.84 3611.52
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2898.72 3611.52
Nakamachi Omaezaki City 623.494 3732.95 3611.52
Uraga Yokosuka City 622.492 1768.79 3611.52
Goritoge Shika Town 622.143 3965.29 3611.52
Kumatori town Minami primary school Station 606.134 3373.92 3611.52
Radiation dose at JAEA Oarai (P1) 603.643 3567.74
Yamanotedai-No.1 Park Station 599.140 3146.87 3611.52
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3584.16
Noumi Shika Town 594.021 3923.03 3611.52
Radiation dose in Watari 591.851 3565.01
Hairando Yokosuka City 588.667 2217.6 3611.52
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2240.76 3597.84
Ningyotoge Kagamino Town 574.857 3146.87 3611.52
Ten-no Kagamino Town 569.960 3769.92 3611.52
Funagura Yokosuka City 563.909 2090.88 3611.52
Chidori Kawasaki Ward 560.211 2022.23 3611.52
Radiation dose at JAEA Oarai (P16) 556.365 3565.01
Shika Shika Town 551.376 3780.47 3611.52
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2455.2 3611.52
Sahara Yokosuka City 547.404 1958.87 3611.52
Kazanashi Shika Town 545.377 3548.16 3611.52
Akasumi Shika Town 544.970 3247.2 3611.52
Kurahashi Maizuru City 540.820 2956.79 3611.52
Obama Obama City 540.809 2645.28 3611.52
Sakuragaike community hall Omaezaki City 540.772 3827.99 3611.52
Shirowa primary school Omaezaki City 535.692 3748.79 3611.52
Radiation dose at JAEA Oarai (P5) 529.759 3565.01
Uenohara Omaezaki City 529.333 3854.41 3611.52
Kumano Shika Town 529.019 3680.17 3611.52
Izumisano municipal Hineno filtration plant Station 527.471 3173.29 3611.52
Nishi-hamasada Matsue City 525.089 3505.76 3595.1
Kouno Minami-Echizen Town 525.028 2661.12 3611.52
Kurihama Yokosuka City 523.708 2117.27 3611.52
Osaka prefectural Kumatori off-site-center Station 522.808 2925.11 3611.52
Ogasa branch Kikugawa City 522.039 3892.39 3597.84
Izumisano municipal Hineno primary scool Station 518.181 2539.69 3611.52
Shirasuna Omaezaki City 499.479 3775.21 3611.52
Jitougata primary school Makinohara City 498.059 3622.07 3611.52
Kataku Matsue City 497.007 2814.23 3611.52
Nishihemi Yokosuka City 496.917 1689.59 3611.52
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3584.16
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2772 3611.52
Otomi Takahama Town 494.821 3104.64 3611.52
Otsu Nanao City 493.895 3115.19 3611.52
The Observation point for comparison Tatsunokuchi 493.454 2566.08 3611.52
Hitsuhama Ohi Town 492.630 2888.17 3611.52
Kijiyama Misasa Town 489.284 2930.4 3611.52
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3584.16
Hiraba Omaezaki City 485.878 3775.21 3611.52
Tayu Matsue City 484.956 2935.69 3611.52
Hamaokakita primary school Omaezaki City 484.537 3866.1 3597.84
Oitomi Ayabe City 474.670 3722.4 3611.52
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3584.16
Kashiwazaki-shigai Kashiwazaki City 470.822 2962.08 3611.52
Mitsu Matsue City 466.897 2808.97 3611.52
Tonomachi Kawasaki Ward 463.967 3558.71 3611.52
Daitou branch Kakegawa City 463.829 3808.25 3597.84
Fukura Shika Town 462.493 3542.87 3611.52
Nagasawa Yokosuka City 462.365 2069.75 3611.52
The athletic field Station of Kinki University 461.661 2339.03 3611.52
Koura Matsue City 461.049 3352.79 3611.52
Sakurasan Ward Omaezaki City 459.434 3653.75 3611.52
Tsuchikawa Nanao City 458.915 3447.83 3611.52
Kumatori Town office Station 457.917 2412.97 3611.52
Shinkango Omaezaki City 449.013 4229.28 3611.52
Ogurui Takahama Town 448.279 2766.71 3611.52
Kusabue Omaezaki City 444.162 3986.39 3611.52
Omaezaki City monitoring center 443.946 3912.48 3611.52
Akawase Kagamino Town 442.246 2412.97 3611.52
Ibaraki 442.139 1770.05 3603.31
Hinode Town Yokosuka City 438.324 1393.92 3611.52
Nishiyama Kashiwazaki City 437.251 4192.31 3611.52
Kariwa Kariwa Village 436.307 3162.71 3611.52
Osaka prefectural Hineno high scool Station 435.745 2819.52 3611.52
Miyagawa Kashiwazaki City 435.245 3120.48 3611.52
Radiation dose in Natori 434.640 3565.01
Kami-koubu Matsue City 433.868 3067.67 3611.52
Shimo-Takamachi Kariwa Village 433.192 3442.57 3611.52
Osaka prefectural Sano supporting school Station 432.398 3072.96 3611.52
Arahama Kashiwazaki City 428.874 3215.52 3611.52
Doai Kashiwazaki City 425.681 3025.44 3611.52
Owashi Matsue City 424.452 2999.05 3611.52
Okayasu Maizuru City 422.568 3532.32 3611.52
Katsuyama Kariwa Village 421.280 3215.52 3611.52
Kita-koubu Matsue City 420.683 3289.43 3611.52
Kichisaka Maizuru City 413.065 4292.64 3611.52
Nagai Ohi Town 410.699 3118.67 3603.31
Shiokumi Maizuru City 407.938 5343.37 3611.52
Miyadome Ohi Town 407.831 2587.21 3611.52
Kariwa Kariwa Village 407.617 3331.69 3611.52
Ueno Satsuma-sendai City 394.248 2418.23 3611.52
Power Station-South 389.191 3521.77 3611.52
Radiation dose at JAEA Oarai (P6) 386.963 3565.01
Power Station- 385.546 3437.28 3611.52
Takae Satsuma-sendai City 379.551 2449.91 3611.52
Hokawaduura Genkai Town 378.015 3730.32 3611.52
Kou Itimatsu Suetsugu 377.929 2692.8 3611.52
Minato Satsuma-sendai City 377.656 2243.99 3611.52
Iwanai Iwanai Town 376.336 3656.27 3608.78
Hattari Kyowa Town 373.047 3556.01 3608.78
Chatsu Tomari Village 371.011 3397.73 3608.78
Oyama Maizuru City 358.223 3094.09 3611.52
Kodaira Satsuma-sendai City 355.545 2270.41 3611.52
Kayanuma Tomari Village 354.809 3023.15 3608.78
Anojiri Obama City 353.215 2534.4 3611.52
Kushi Genkai Town 349.738 5148 3611.52
Yamaguchi 348.715 4045.82 3603.31
Sadahongou Matsue City 348.228 3152.16 3611.52
Sakibe Karatsu City 347.801 4878.72 3611.52
Hirao Genkai Town 343.814 5142.71 3611.52
The Meteorological Obsevatory of kyowa Town 343.275 3371.36 3608.78
Minami-Horoni Kyowa Town 335.180 3160.31 3608.78
Kounoura Takahama Town 330.353 2671.67 3611.52
Kyoudomarisaki Karatsu City 328.622 5227.2 3611.52
Horikappu Jinja Tomari Village 328.230 3271.11 3608.78
Hukada-kita Matsue City 327.031 2592.47 3611.52
Radiation dose in KEK, Tsukuba 326.240 3584.16
Herokaruusu Tomari Village 324.242 3392.48 3608.78
Yorita Satsuma-sendai City 323.218 2655.83 3611.52
Kamoenai Kamoenai Village 322.032 2864.87 3608.78
Radiation dose in Onagawa (MP-6) 316.267 3562.27
Imamura Genkai Town 314.749 44299.1 3611.52
Yamanaka Takahama Town 314.185 3447.83 3611.52
Sendai (Miyagi) 312.585 1621.49 3603.31
Radiation dose in Onagawa (MP-1) 300.147 3562.27
Gumisaki Satsuma-sendai City 295.693 2143.69 3611.52
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3584.16
Aomori Aomori City 285.372 2178.98 3608.78
Misawa City hall Misawa City 283.728 4226.08 3608.78
Kashu Ikata Town 277.173 2212.31 3611.52
Noheji Town Office Noheji Town 272.004 1867.7 3608.78
Takasimamati 271.103 2354.87 3611.52
Radiation dose in Onagawa (MP-3) 270.563 3562.27
Kucho Ikata Town 269.545 1953.61 3611.52
Radiation dose in Marumori 269.436 3565.01
Kawanagata Ikata Town 266.821 1906.09 3611.52
Tochigi 260.733 2117.74 3603.31
Chikagawa Mutu City 256.719 2432.23 3608.78
Yokohama Town Office Yokohama Town 254.846 2980.95 3608.78
Tokyo 251.877 2497.03 3603.31
Hiranuma Rokkasho Village 251.186 1957.39 3608.78
Taisei Ikata Town 246.293 1430.89 3611.52
Chitose-daira Rokkasho Village 245.868 2110.41 3608.78
Gifu 243.951 3476.88 3603.31
Fukkoshi Yokohama Town 243.102 2047.1 3608.78
Shimane 240.651 3476.88 3603.31
Sunagomata Higashidoori Village 238.012 2959.84 3608.78
Obuchi Rokkasho Village 237.506 2353.09 3608.78
Tomari Rokkasho Village 230.636 3292.22 3608.78
kanagawa 226.339 2180.95 3603.31
Saitama 219.770 1896.48 3603.31
Ikatagoshi Ikata Town 217.515 1800.47 3611.52
Touhoku Branch office Touhoku Town 215.416 1704.14 3608.78
Radiation dose at Tohoku University 214.824 3565.01
Odanosawa Higashidoori Village 210.287 2358.37 3608.78
Kagawa 205.829 2433.82 3603.31
Oippe Higashidoori Village 205.182 2031.27 3608.78
Oita 200.921 2686.68 3603.31
Touhoku Town office Touhoku Town 200.811 7882.34 3608.78
Kuchogoshi Ikata Town 198.646 1826.89 3611.52
Minatoura Ikata Town 186.776 1642.07 3611.52
Radiation dose in Koyadori, Ojika 184.905 3559.54
Toyama 184.580 4646.38 3603.31
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2240.76 3597.84
Radiation dose in Tukahama, Ojika 183.417 3559.54
Chiba 182.407 1390.75 3603.31
Nara 182.387 2528.64 3603.31
Okayama 181.976 3287.23 3603.31
Yamagata 181.598 2591.86 3603.31
Ehime 180.745 2338.99 3603.31
Ishikawa 180.445 4030.02 3603.31
Niigata 177.483 4836.02 3603.31
Hiroshima 176.816 2180.95 3603.31
Mie 174.867 2493.87 3603.31
Fukui 170.045 3065.98 3603.31
Radiation dose in Terama, Ojika 168.036 3559.54
Yamanashi 164.561 2022.91 3603.31
Nagano 162.242 3078.62 3603.31
Saga 161.421 2718.29 3603.31
Tottori 161.392 2497.03 3603.31
Radiation dose in Enoshima, Ojika 160.091 3559.54
Osaka 159.103 1928.09 3603.31
Ibaraki-city Environment 157.249 3518.5
Aichi 149.345 2338.99 3603.31
Toyonoura Ikata Town 149.214 1884.96 3611.52
Shizuoka 148.639 2418.01 3603.31
Kyoto 144.522 2749.9 3603.31
Kagoshima 144.449 2980.63 3603.31
Tokushima 143.627 2117.74 3603.31
Gunma 143.572 1422.36 3603.31
Hyogo 139.710 2402.21 3603.31
Fukuoka 136.511 2497.03 3603.31
Wakayama 133.857 1770.05 3603.31
Radiation at Tamaki-cho Mie Japan 133.138 3518.5
Akita 132.832 2718.29 3603.31
Shiga 124.919 1928.09 3603.31
Nagasaki 109.459 2180.95 3603.31
Hokkaido 109.189 3318.84 3603.31
Kumamoto 103.568 2117.74 3603.31
Aomori 101.819 3224.02 3603.31
Miyazaki 100.354 2098.77 3603.31
Kochi 95.931 2402.21 3603.31
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2232.24 3584.16
Iwate 90.324 2655.07 3603.31
Environment Feeds from Ohta 83.623 3518.5
Okinawa 82.305 1817.46 3603.31
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