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Accumulated absorbed dose rate - T=13.03.2011 - 26.07.2016(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 5283.22
Fukushima I MP8 570942.000 5283.22
Fukushima I MP6 240668.000 5283.22
Yamada Futaba Town 176983.000 4061.64 4839.98
Fukushima I MP2 140420.000 5283.22
Fukushima I MP5 111325.000 5283.22
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3334.73 5354.35
Fukushima I MP3 93730.602 5283.22
Fukushima I MP4 86821.500 5283.22
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3334.73 5354.35
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3283.61 5272.27
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3334.73 5354.35
Ono Okuma Town 38610.500 3750.27 4839.98
Shinzan Futaba Town 38332.801 3403.57 4839.98
Fukushima I MP1 31496.801 5283.22
Yonomori Tomioka Town 29815.900 3877.63 4839.98
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3334.73 5354.35
Tomioka Tomioka Town 25324.500 4174.83 4839.98
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3334.73 5354.35
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3334.73 5354.35
Shimo-Kooriyama Tomioka Town 13057.000 4146.55 4839.98
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3334.73 5354.35
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3334.73 5354.35
Kami-kooriyama Tomioka Town 11803.900 3254.97 4839.98
Fukushima II MP3 11060.600 5283.22
Fukushima II MP1 10903.000 5283.22
Kooriyama Futaba Town 10352.900 3792.72 4839.98
Fukushima II MP4 9696.330 5283.22
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3331.32 5348.88
Fukushima II MP5 9382.150 5283.22
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3334.73 5354.35
Matsudate Naraha Town 8410.890 4429.56 4839.98
Shigeoka Naraha Town 8115.970 4896.58 4839.98
Fukushima II MP2 7875.320 5283.22
Namie Namie Town 7321.210 3573.39 4839.98
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5299.63
Fukushima II MP6 7062.690 5283.22
Fukushima II MP7 6511.580 5280.48
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3334.73 5354.35
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3334.73 5354.35
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3334.73 5354.35
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3334.73 5354.35
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3334.73 5354.35
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3334.73 5354.35
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3329.62 5346.14
Futatsunuma Hirono Town 3520.340 4245.6 4839.98
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3334.73 5354.35
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3334.73 5354.35
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5296.9
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3334.73 5354.35
Kiyohashi Namie Town 3162.000 3134.65 4839.98
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3329.62 5346.14
Radiation dose at Agricultural center, Koriyama 3128.960 5296.9
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3334.73 5354.35
Radiation dose at Koriyama city office, Koriyama 2803.520 5296.9
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3334.73 5354.35
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3329.62 5346.14
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3334.73 5354.35
Yamadaoka Naraha Town 2205.340 3764.45 4839.98
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5299.63
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3334.73 5354.35
Kuji Hitachi City 1990.890 8283.26 5365.3
Hitachinaka Hitachinaka City 1951.950 3637.74 5362.56
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3329.62 5346.14
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3329.62 5346.14
Momiyama Hokota City 1837.540 4149.49 5365.3
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3329.62 5346.14
Horiguchi Hitachinaka City 1779.410 3625.78 5368.03
Onuma Hitachi City 1776.950 3088.98 5362.56
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3334.73 5354.35
Tsukuriya Hokota City 1736.890 3490.6 5365.3
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5296.9
Nemoto Hitachioomiya City 1633.190 3888.66 5362.56
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3334.73 5354.35
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3334.73 5354.35
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5305.1
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3334.73 5354.35
Radiation dose at JAEA Oarai (P12) 1512.140 5321.52
Radiation dose at Ose administration center, Koriyama 1494.270 5296.9
Araji Hokota City 1437.760 3498.41 5365.3
Ishigami Tokai Village 1431.690 3184.68 5365.3
Mawatari Hitachinaka City 1422.870 3678.85 5365.3
Radiation dose at JAEA Oarai (P11) 1399.370 5321.52
Onuki Oarai Town 1387.990 3820.04 5365.3
Sawa Hitachinaka City 1353.770 2885.1 5362.56
Toyooka Tokai Village 1321.760 3506.27 5365.3
Ajigaura Hitachinaka City 1313.890 3449.58 5362.56
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3334.73 5354.35
Geiger Counter Feeds from Asao Kawasaki 1266.620 5275.01
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5296.9
Isohama Oarai Town 1250.540 3330.28 5359.82
Ebisawa Ibaraki Town 1222.240 9041.09 5362.56
Muramatsu Tokai Village 1203.520 3537.66 5365.3
Kamitoda Hokota City 1184.740 2902.3 5365.3
Yanagisawa Hitachinaka City 1166.970 2955.66 5362.56
Tokushuku Hokota City 1159.730 2619.91 5365.3
Tasaki Hokota City 1153.300 3096.62 5335.2
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3334.73 5354.35
Kadobe Naka City 1086.580 7040.34 5362.56
Radiation dose at Date city office, Date 1076.050 5299.63
Oshinobe Tokai Village 1041.340 3302.34 5365.3
Oba Mito City 1037.670 10848.3 5365.3
Godai Naka City 1031.270 2863.04 5365.3
Ishikawa Mito City 1030.810 3374.66 5368.03
Isobe Hitachiota City 1013.130 16284.1 5365.3
Yatabe Ibaraki Town 996.127 2831.7 5365.3
Radiation dose at Motomiya city office, Motomiya 992.703 5299.63
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3329.62 5346.14
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3329.62 5346.14
Yokobori Naka City 930.280 3318.01 5365.3
Sugaya Naka City 926.186 5069.82 5368.03
Kounosu Naka City 926.087 2588.52 5365.3
Funaishikawa Tokai Village 900.399 3435.67 5365.3
Nukada Naka City 899.900 3103.06 5359.82
Uridura Naka City 890.113 2962.01 5359.82
Shiraki Tsuruga City 881.330 6286.25 5368.03
Motokomezaki Naka City 880.851 2759.78 5332.46
Shiraki pass Tsuruga City 850.284 6584.46 5368.03
Radiation dose in Yamamoto 846.633 5321.52
Yoshizawa Mito City 837.646 2996.42 5365.3
Radiation dose at JAEA Oarai (P7) 831.135 5321.52
Mayumi Hitachiota City 828.119 2972.89 5365.3
Urasoko Tsuruga City 826.465 5218.9 5368.03
Nemoto Hitachioomiya City 825.588 3347.7 5362.56
Takenami Mihama Town 804.283 5477.89 5368.03
Radiation dose at JAEA Oarai (P15) 780.207 5321.52
Tateishi Tsuruga City 780.092 4339.96 5368.03
Radiation dose at JAEA Oarai (P14) 770.174 5321.52
Radiation dose at JAEA Oarai (P13) 769.612 5321.52
Ukishima Kawasaki Ward 735.475 10241.6 5368.03
Kume Hitachiota City 713.958 2910.11 5365.3
Radiation dose at JAEA Oarai (P2) 712.011 5321.52
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3329.62 5346.14
Nyuu Mihama Town 674.787 4991.33 5368.03
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3334.73 5354.35
Radiation dose in Iwanuma 670.242 5321.52
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3334.73 5354.35
Tsuruga Tsuruga City 655.360 4402.73 5368.03
Shiohama Kawasaki Ward 653.536 3515.92 5368.03
Radiation dose in Kakuda 649.863 5321.52
Sakajiri Mihama Town 649.252 5823.23 5368.03
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3657.18 5368.03
Radiation dose in Onagawa (MP-2) 632.968 5318.78
Kumatori town Nishi primary school Station 631.491 4371.32 5368.03
Oshima Kawasaki Ward 630.402 3351.11 5368.03
Izumisano municipal Oike athletic field Station 629.920 4928.56 5368.03
Atom-kyoudou nursery school Station 625.566 4732.34 5368.03
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4308.55 5368.03
Nakamachi Omaezaki City 623.494 5548.52 5368.03
Uraga Yokosuka City 622.492 2629.06 5368.03
Goritoge Shika Town 622.143 5893.86 5368.03
Kumatori town Minami primary school Station 606.134 5014.87 5368.03
Radiation dose at JAEA Oarai (P1) 603.643 5324.26
Yamanotedai-No.1 Park Station 599.140 4677.39 5368.03
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 5340.67
Noumi Shika Town 594.021 5831.05 5368.03
Radiation dose in Watari 591.851 5321.52
Hairando Yokosuka City 588.667 3296.16 5368.03
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3334.73 5354.35
Ningyotoge Kagamino Town 574.857 4677.39 5368.03
Ten-no Kagamino Town 569.960 5603.47 5368.03
Funagura Yokosuka City 563.909 3107.81 5368.03
Chidori Kawasaki Ward 560.211 3005.77 5368.03
Radiation dose at JAEA Oarai (P16) 556.365 5321.52
Shika Shika Town 551.376 5619.15 5368.03
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3649.32 5368.03
Sahara Yokosuka City 547.404 2911.59 5368.03
Kazanashi Shika Town 545.377 5273.86 5368.03
Akasumi Shika Town 544.970 4826.52 5368.03
Kurahashi Maizuru City 540.820 4394.86 5368.03
Obama Obama City 540.809 3931.85 5368.03
Sakuragaike community hall Omaezaki City 540.772 5689.78 5368.03
Shirowa primary school Omaezaki City 535.692 5572.06 5368.03
Radiation dose at JAEA Oarai (P5) 529.759 5321.52
Uenohara Omaezaki City 529.333 5729.06 5368.03
Kumano Shika Town 529.019 5470.07 5368.03
Izumisano municipal Hineno filtration plant Station 527.471 4716.66 5368.03
Nishi-hamasada Matsue City 525.089 5218.62 5351.62
Kouno Minami-Echizen Town 525.028 3955.39 5368.03
Kurihama Yokosuka City 523.708 3147.03 5368.03
Osaka prefectural Kumatori off-site-center Station 522.808 4347.78 5368.03
Ogasa branch Kikugawa City 522.039 5792.7 5354.35
Izumisano municipal Hineno primary scool Station 518.181 3774.9 5368.03
Shirasuna Omaezaki City 499.479 5611.34 5368.03
Jitougata primary school Makinohara City 498.059 5383.71 5368.03
Kataku Matsue City 497.007 4182.97 5368.03
Nishihemi Yokosuka City 496.917 2511.34 5368.03
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 5340.67
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4120.2 5368.03
Otomi Takahama Town 494.821 4614.62 5368.03
Otsu Nanao City 493.895 4630.3 5368.03
The Observation point for comparison Tatsunokuchi 493.454 3814.13 5368.03
Hitsuhama Ohi Town 492.630 4292.87 5368.03
Kijiyama Misasa Town 489.284 4355.64 5368.03
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 5340.67
Hiraba Omaezaki City 485.878 5611.34 5368.03
Tayu Matsue City 484.956 4363.5 5368.03
Hamaokakita primary school Omaezaki City 484.537 5753.58 5354.35
Oitomi Ayabe City 474.670 5532.84 5368.03
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 5340.67
Kashiwazaki-shigai Kashiwazaki City 470.822 4402.73 5368.03
Mitsu Matsue City 466.897 4175.15 5368.03
Tonomachi Kawasaki Ward 463.967 5289.54 5368.03
Daitou branch Kakegawa City 463.829 5667.49 5354.35
Fukura Shika Town 462.493 5265.99 5368.03
Nagasawa Yokosuka City 462.365 3076.4 5368.03
The athletic field Station of Kinki University 461.661 3476.65 5368.03
Koura Matsue City 461.049 4983.46 5368.03
Sakurasan Ward Omaezaki City 459.434 5430.8 5368.03
Tsuchikawa Nanao City 458.915 5124.73 5368.03
Kumatori Town office Station 457.917 3586.55 5368.03
Shinkango Omaezaki City 449.013 6286.25 5368.03
Ogurui Takahama Town 448.279 4112.34 5368.03
Kusabue Omaezaki City 444.162 5925.22 5368.03
Omaezaki City monitoring center 443.946 5815.37 5368.03
Akawase Kagamino Town 442.246 3586.55 5368.03
Ibaraki 442.139 2632.9 5359.82
Hinode Town Yokosuka City 438.324 2071.87 5368.03
Nishiyama Kashiwazaki City 437.251 6231.3 5368.03
Kariwa Kariwa Village 436.307 4700.94 5368.03
Osaka prefectural Hineno high scool Station 435.745 4190.83 5368.03
Miyagawa Kashiwazaki City 435.245 4638.17 5368.03
Radiation dose in Natori 434.640 5321.52
Kami-koubu Matsue City 433.868 4559.67 5368.03
Shimo-Takamachi Kariwa Village 433.192 5116.91 5368.03
Osaka prefectural Sano supporting school Station 432.398 4567.54 5368.03
Arahama Kashiwazaki City 428.874 4779.43 5368.03
Doai Kashiwazaki City 425.681 4496.9 5368.03
Owashi Matsue City 424.452 4457.68 5368.03
Okayasu Maizuru City 422.568 5250.31 5368.03
Katsuyama Kariwa Village 421.280 4779.43 5368.03
Kita-koubu Matsue City 420.683 4889.29 5368.03
Kichisaka Maizuru City 413.065 6380.42 5368.03
Nagai Ohi Town 410.699 4638.93 5359.82
Shiokumi Maizuru City 407.938 7942.19 5368.03
Miyadome Ohi Town 407.831 3845.54 5368.03
Kariwa Kariwa Village 407.617 4952.1 5368.03
Ueno Satsuma-sendai City 394.248 3594.37 5368.03
Power Station-South 389.191 5234.63 5368.03
Radiation dose at JAEA Oarai (P6) 386.963 5321.52
Power Station- 385.546 5109.05 5368.03
Takae Satsuma-sendai City 379.551 3641.46 5368.03
Hokawaduura Genkai Town 378.015 5544.61 5368.03
Kou Itimatsu Suetsugu 377.929 4002.48 5368.03
Minato Satsuma-sendai City 377.656 3335.38 5368.03
Iwanai Iwanai Town 376.336 5435.89 5365.3
Hattari Kyowa Town 373.047 5286.84 5365.3
Chatsu Tomari Village 371.011 5051.52 5365.3
Oyama Maizuru City 358.223 4598.94 5368.03
Kodaira Satsuma-sendai City 355.545 3374.66 5368.03
Kayanuma Tomari Village 354.809 4494.61 5365.3
Anojiri Obama City 353.215 3767.04 5368.03
Kushi Genkai Town 349.738 7651.8 5368.03
Yamaguchi 348.715 6018.05 5359.82
Sadahongou Matsue City 348.228 4685.26 5368.03
Sakibe Karatsu City 347.801 7251.55 5368.03
Hirao Genkai Town 343.814 7643.94 5368.03
The Meteorological Obsevatory of kyowa Town 343.275 5012.32 5365.3
Minami-Horoni Kyowa Town 335.180 4698.54 5365.3
Kounoura Takahama Town 330.353 3971.07 5368.03
Kyoudomarisaki Karatsu City 328.622 7769.52 5368.03
Horikappu Jinja Tomari Village 328.230 4863.26 5365.3
Hukada-kita Matsue City 327.031 3853.35 5368.03
Radiation dose in KEK, Tsukuba 326.240 5340.67
Herokaruusu Tomari Village 324.242 5043.71 5365.3
Yorita Satsuma-sendai City 323.218 3947.53 5368.03
Kamoenai Kamoenai Village 322.032 4259.29 5365.3
Radiation dose in Onagawa (MP-6) 316.267 5318.78
Imamura Genkai Town 314.749 65844.6 5368.03
Yamanaka Takahama Town 314.185 5124.73 5368.03
Sendai (Miyagi) 312.585 2411.92 5359.82
Radiation dose in Onagawa (MP-1) 300.147 5318.78
Gumisaki Satsuma-sendai City 295.693 3186.3 5368.03
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 5340.67
Aomori Aomori City 285.372 3239.56 5365.3
Misawa City hall Misawa City 283.728 6283.04 5365.3
Kashu Ikata Town 277.173 3288.3 5368.03
Noheji Town Office Noheji Town 272.004 2776.78 5365.3
Takasimamati 271.103 3500.19 5368.03
Radiation dose in Onagawa (MP-3) 270.563 5318.78
Kucho Ikata Town 269.545 2903.78 5368.03
Radiation dose in Marumori 269.436 5321.52
Kawanagata Ikata Town 266.821 2833.14 5368.03
Tochigi 260.733 3150.07 5359.82
Chikagawa Mutu City 256.719 3616.07 5365.3
Yokohama Town Office Yokohama Town 254.846 4431.88 5365.3
Tokyo 251.877 3714.26 5359.82
Hiranuma Rokkasho Village 251.186 2910.11 5365.3
Taisei Ikata Town 246.293 2126.82 5368.03
Chitose-daira Rokkasho Village 245.868 3137.62 5365.3
Gifu 243.951 5171.76 5359.82
Fukkoshi Yokohama Town 243.102 3043.49 5365.3
Shimane 240.651 5171.76 5359.82
Sunagomata Higashidoori Village 238.012 4400.48 5365.3
Obuchi Rokkasho Village 237.506 3498.41 5365.3
Tomari Rokkasho Village 230.636 4894.66 5365.3
kanagawa 226.339 3244.1 5359.82
Saitama 219.770 2820.96 5359.82
Ikatagoshi Ikata Town 217.515 2676.15 5368.03
Touhoku Branch office Touhoku Town 215.416 2533.6 5365.3
Radiation dose at Tohoku University 214.824 5321.52
Odanosawa Higashidoori Village 210.287 3506.27 5365.3
Kagawa 205.829 3620.23 5359.82
Oippe Higashidoori Village 205.182 3019.96 5365.3
Oita 200.921 3996.36 5359.82
Touhoku Town office Touhoku Town 200.811 11718.9 5365.3
Kuchogoshi Ikata Town 198.646 2715.42 5368.03
Minatoura Ikata Town 186.776 2440.71 5368.03
Radiation dose in Koyadori, Ojika 184.905 5316.05
Toyama 184.580 6911.35 5359.82
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3334.73 5354.35
Radiation dose in Tukahama, Ojika 183.417 5316.05
Chiba 182.407 2068.7 5359.82
Nara 182.387 3761.28 5359.82
Okayama 181.976 4889.66 5359.82
Yamagata 181.598 3855.31 5359.82
Ehime 180.745 3479.18 5359.82
Ishikawa 180.445 5994.54 5359.82
Niigata 177.483 7193.45 5359.82
Hiroshima 176.816 3244.1 5359.82
Mie 174.867 3709.56 5359.82
Fukui 170.045 4560.55 5359.82
Radiation dose in Terama, Ojika 168.036 5316.05
Yamanashi 164.561 3009.02 5359.82
Nagano 162.242 4579.36 5359.82
Saga 161.421 4043.38 5359.82
Tottori 161.392 3714.26 5359.82
Radiation dose in Enoshima, Ojika 160.091 5316.05
Osaka 159.103 2867.98 5359.82
Ibaraki-city Environment 157.249 5275.01
Aichi 149.345 3479.18 5359.82
Toyonoura Ikata Town 149.214 2801.74 5368.03
Shizuoka 148.639 3596.72 5359.82
Kyoto 144.522 4090.39 5359.82
Kagoshima 144.449 4433.61 5359.82
Tokushima 143.627 3150.07 5359.82
Gunma 143.572 2115.72 5359.82
Hyogo 139.710 3573.22 5359.82
Fukuoka 136.511 3714.26 5359.82
Wakayama 133.857 2632.9 5359.82
Radiation at Tamaki-cho Mie Japan 133.138 5275.01
Akita 132.832 4043.38 5359.82
Shiga 124.919 2867.98 5359.82
Nagasaki 109.459 3244.1 5359.82
Hokkaido 109.189 4936.68 5359.82
Kumamoto 103.568 3150.07 5359.82
Aomori 101.819 4795.63 5359.82
Miyazaki 100.354 3121.86 5359.82
Kochi 95.931 3573.22 5359.82
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3326.21 5340.67
Iwate 90.324 3949.34 5359.82
Environment Feeds from Ohta 83.623 5275.01
Okinawa 82.305 2703.42 5359.82
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