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Accumulated absorbed dose rate - T=13.03.2011 - 27.01.2015(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 3789.36
Fukushima I MP8 570942.000 3789.36
Fukushima I MP6 240668.000 3789.36
Yamada Futaba Town 176983.000 2808.02 3346.13
Fukushima I MP2 140420.000 3789.36
Fukushima I MP5 111325.000 3789.36
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2404.34 3860.5
Fukushima I MP3 93730.602 3789.36
Fukushima I MP4 86821.500 3789.36
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2404.34 3860.5
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2353.22 3778.42
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2404.34 3860.5
Ono Okuma Town 38610.500 2592.75 3346.13
Shinzan Futaba Town 38332.801 2353.06 3346.13
Fukushima I MP1 31496.801 3789.36
Yonomori Tomioka Town 29815.900 2680.81 3346.13
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2404.34 3860.5
Tomioka Tomioka Town 25324.500 2886.27 3346.13
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2404.34 3860.5
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2404.34 3860.5
Shimo-Kooriyama Tomioka Town 13057.000 2866.72 3346.13
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2404.34 3860.5
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2404.34 3860.5
Kami-kooriyama Tomioka Town 11803.900 2250.33 3346.13
Fukushima II MP3 11060.600 3789.36
Fukushima II MP1 10903.000 3789.36
Kooriyama Futaba Town 10352.900 2622.1 3346.13
Fukushima II MP4 9696.330 3789.36
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2400.94 3855.02
Fukushima II MP5 9382.150 3789.36
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2404.34 3860.5
Matsudate Naraha Town 8410.890 3062.38 3346.13
Shigeoka Naraha Town 8115.970 3385.25 3346.13
Fukushima II MP2 7875.320 3789.36
Namie Namie Town 7321.210 2470.47 3346.13
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3805.78
Fukushima II MP6 7062.690 3789.36
Fukushima II MP7 6511.580 3786.62
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2404.34 3860.5
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2404.34 3860.5
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2404.34 3860.5
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2404.34 3860.5
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2404.34 3860.5
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2404.34 3860.5
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2399.23 3852.29
Futatsunuma Hirono Town 3520.340 2935.2 3346.13
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2404.34 3860.5
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2404.34 3860.5
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3803.04
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2404.34 3860.5
Kiyohashi Namie Town 3162.000 2167.15 3346.13
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2399.23 3852.29
Radiation dose at Agricultural center, Koriyama 3128.960 3803.04
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2404.34 3860.5
Radiation dose at Koriyama city office, Koriyama 2803.520 3803.04
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2404.34 3860.5
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2399.23 3852.29
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2404.34 3860.5
Yamadaoka Naraha Town 2205.340 2602.55 3346.13
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3805.78
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2404.34 3860.5
Kuji Hitachi City 1990.890 5976.96 3871.44
Hitachinaka Hitachinaka City 1951.950 2624.37 3868.7
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2399.23 3852.29
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2399.23 3852.29
Momiyama Hokota City 1837.540 2994.15 3871.44
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2399.23 3852.29
Horiguchi Hitachinaka City 1779.410 2616.77 3874.18
Onuma Hitachi City 1776.950 2228.48 3868.7
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2404.34 3860.5
Tsukuriya Hokota City 1736.890 2518.71 3871.44
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3803.04
Nemoto Hitachioomiya City 1633.190 2805.39 3868.7
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2404.34 3860.5
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2404.34 3860.5
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3811.25
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2404.34 3860.5
Radiation dose at JAEA Oarai (P12) 1512.140 3827.66
Radiation dose at Ose administration center, Koriyama 1494.270 3803.04
Araji Hokota City 1437.760 2524.35 3871.44
Ishigami Tokai Village 1431.690 2297.97 3871.44
Mawatari Hitachinaka City 1422.870 2654.55 3871.44
Radiation dose at JAEA Oarai (P11) 1399.370 3827.66
Onuki Oarai Town 1387.990 2756.43 3871.44
Sawa Hitachinaka City 1353.770 2081.4 3868.7
Toyooka Tokai Village 1321.760 2530.02 3871.44
Ajigaura Hitachinaka City 1313.890 2488.63 3868.7
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2404.34 3860.5
Geiger Counter Feeds from Asao Kawasaki 1266.620 3781.15
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3803.04
Isohama Oarai Town 1250.540 2402.09 3865.97
Ebisawa Ibaraki Town 1222.240 6522.5 3868.7
Muramatsu Tokai Village 1203.520 2552.67 3871.44
Kamitoda Hokota City 1184.740 2094.21 3871.44
Yanagisawa Hitachinaka City 1166.970 2132.3 3868.7
Tokushuku Hokota City 1159.730 1890.45 3871.44
Tasaki Hokota City 1153.300 2229.56 3841.34
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2404.34 3860.5
Kadobe Naka City 1086.580 5079.1 3868.7
Radiation dose at Date city office, Date 1076.050 3805.78
Oshinobe Tokai Village 1041.340 2382.87 3871.44
Oba Mito City 1037.670 7827.78 3871.44
Godai Naka City 1031.270 2065.89 3871.44
Ishikawa Mito City 1030.810 2435.53 3874.18
Isobe Hitachiota City 1013.130 11750.2 3871.44
Yatabe Ibaraki Town 996.127 2043.27 3871.44
Radiation dose at Motomiya city office, Motomiya 992.703 3805.78
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2399.23 3852.29
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2399.23 3852.29
Yokobori Naka City 930.280 2394.18 3871.44
Sugaya Naka City 926.186 3658.96 3874.18
Kounosu Naka City 926.087 1867.8 3871.44
Funaishikawa Tokai Village 900.399 2479.08 3871.44
Nukada Naka City 899.900 2238.19 3865.97
Uridura Naka City 890.113 2136.46 3865.97
Shiraki Tsuruga City 881.330 4536.86 3874.18
Motokomezaki Naka City 880.851 1986.65 3838.61
Shiraki pass Tsuruga City 850.284 4752.08 3874.18
Radiation dose in Yamamoto 846.633 3827.66
Yoshizawa Mito City 837.646 2162.13 3871.44
Radiation dose at JAEA Oarai (P7) 831.135 3827.66
Mayumi Hitachiota City 828.119 2145.15 3871.44
Urasoko Tsuruga City 826.465 3766.55 3874.18
Nemoto Hitachioomiya City 825.588 2415.12 3868.7
Takenami Mihama Town 804.283 3953.46 3874.18
Radiation dose at JAEA Oarai (P15) 780.207 3827.66
Tateishi Tsuruga City 780.092 3132.2 3874.18
Radiation dose at JAEA Oarai (P14) 770.174 3827.66
Radiation dose at JAEA Oarai (P13) 769.612 3827.66
Ukishima Kawasaki Ward 735.475 7391.52 3874.18
Kume Hitachiota City 713.958 2099.85 3871.44
Radiation dose at JAEA Oarai (P2) 712.011 3827.66
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2399.23 3852.29
Nyuu Mihama Town 674.787 3602.3 3874.18
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2404.34 3860.5
Radiation dose in Iwanuma 670.242 3827.66
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2404.34 3860.5
Tsuruga Tsuruga City 655.360 3177.5 3874.18
Shiohama Kawasaki Ward 653.536 2537.48 3874.18
Radiation dose in Kakuda 649.863 3827.66
Sakajiri Mihama Town 649.252 4202.7 3874.18
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2639.44 3874.18
Radiation dose in Onagawa (MP-2) 632.968 3824.93
Kumatori town Nishi primary school Station 631.491 3154.84 3874.18
Oshima Kawasaki Ward 630.402 2418.54 3874.18
Izumisano municipal Oike athletic field Station 629.920 3557 3874.18
Atom-kyoudou nursery school Station 625.566 3415.39 3874.18
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3109.54 3874.18
Nakamachi Omaezaki City 623.494 4004.44 3874.18
Uraga Yokosuka City 622.492 1897.43 3874.18
Goritoge Shika Town 622.143 4253.68 3874.18
Kumatori town Minami primary school Station 606.134 3619.3 3874.18
Radiation dose at JAEA Oarai (P1) 603.643 3830.4
Yamanotedai-No.1 Park Station 599.140 3375.73 3874.18
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3846.82
Noumi Shika Town 594.021 4208.34 3874.18
Radiation dose in Watari 591.851 3827.66
Hairando Yokosuka City 588.667 2378.88 3874.18
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2404.34 3860.5
Ningyotoge Kagamino Town 574.857 3375.73 3874.18
Ten-no Kagamino Town 569.960 4044.1 3874.18
Funagura Yokosuka City 563.909 2242.94 3874.18
Chidori Kawasaki Ward 560.211 2169.3 3874.18
Radiation dose at JAEA Oarai (P16) 556.365 3827.66
Shika Shika Town 551.376 4055.41 3874.18
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2633.76 3874.18
Sahara Yokosuka City 547.404 2101.33 3874.18
Kazanashi Shika Town 545.377 3806.21 3874.18
Akasumi Shika Town 544.970 3483.36 3874.18
Kurahashi Maizuru City 540.820 3171.83 3874.18
Obama Obama City 540.809 2837.66 3874.18
Sakuragaike community hall Omaezaki City 540.772 4106.39 3874.18
Shirowa primary school Omaezaki City 535.692 4021.43 3874.18
Radiation dose at JAEA Oarai (P5) 529.759 3827.66
Uenohara Omaezaki City 529.333 4134.73 3874.18
Kumano Shika Town 529.019 3947.82 3874.18
Izumisano municipal Hineno filtration plant Station 527.471 3404.08 3874.18
Nishi-hamasada Matsue City 525.089 3761.89 3857.76
Kouno Minami-Echizen Town 525.028 2854.66 3874.18
Kurihama Yokosuka City 523.708 2271.25 3874.18
Osaka prefectural Kumatori off-site-center Station 522.808 3137.84 3874.18
Ogasa branch Kikugawa City 522.039 4176.55 3860.5
Izumisano municipal Hineno primary scool Station 518.181 2724.4 3874.18
Shirasuna Omaezaki City 499.479 4049.77 3874.18
Jitougata primary school Makinohara City 498.059 3885.49 3874.18
Kataku Matsue City 497.007 3018.9 3874.18
Nishihemi Yokosuka City 496.917 1812.47 3874.18
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3846.82
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2973.6 3874.18
Otomi Takahama Town 494.821 3330.43 3874.18
Otsu Nanao City 493.895 3341.75 3874.18
The Observation point for comparison Tatsunokuchi 493.454 2752.7 3874.18
Hitsuhama Ohi Town 492.630 3098.22 3874.18
Kijiyama Misasa Town 489.284 3143.52 3874.18
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3846.82
Hiraba Omaezaki City 485.878 4049.77 3874.18
Tayu Matsue City 484.956 3149.2 3874.18
Hamaokakita primary school Omaezaki City 484.537 4148.34 3860.5
Oitomi Ayabe City 474.670 3993.12 3874.18
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3846.82
Kashiwazaki-shigai Kashiwazaki City 470.822 3177.5 3874.18
Mitsu Matsue City 466.897 3013.26 3874.18
Tonomachi Kawasaki Ward 463.967 3817.52 3874.18
Daitou branch Kakegawa City 463.829 4086.27 3860.5
Fukura Shika Town 462.493 3800.53 3874.18
Nagasawa Yokosuka City 462.365 2220.28 3874.18
The athletic field Station of Kinki University 461.661 2509.14 3874.18
Koura Matsue City 461.049 3596.63 3874.18
Sakurasan Ward Omaezaki City 459.434 3919.48 3874.18
Tsuchikawa Nanao City 458.915 3698.58 3874.18
Kumatori Town office Station 457.917 2588.46 3874.18
Shinkango Omaezaki City 449.013 4536.86 3874.18
Ogurui Takahama Town 448.279 2967.92 3874.18
Kusabue Omaezaki City 444.162 4276.31 3874.18
Omaezaki City monitoring center 443.946 4197.02 3874.18
Akawase Kagamino Town 442.246 2588.46 3874.18
Ibaraki 442.139 1899.07 3865.97
Hinode Town Yokosuka City 438.324 1495.3 3874.18
Nishiyama Kashiwazaki City 437.251 4497.2 3874.18
Kariwa Kariwa Village 436.307 3392.72 3874.18
Osaka prefectural Hineno high scool Station 435.745 3024.58 3874.18
Miyagawa Kashiwazaki City 435.245 3347.42 3874.18
Radiation dose in Natori 434.640 3827.66
Kami-koubu Matsue City 433.868 3290.77 3874.18
Shimo-Takamachi Kariwa Village 433.192 3692.94 3874.18
Osaka prefectural Sano supporting school Station 432.398 3296.45 3874.18
Arahama Kashiwazaki City 428.874 3449.38 3874.18
Doai Kashiwazaki City 425.681 3245.47 3874.18
Owashi Matsue City 424.452 3217.16 3874.18
Okayasu Maizuru City 422.568 3789.22 3874.18
Katsuyama Kariwa Village 421.280 3449.38 3874.18
Kita-koubu Matsue City 420.683 3528.66 3874.18
Kichisaka Maizuru City 413.065 4604.83 3874.18
Nagai Ohi Town 410.699 3346 3865.97
Shiokumi Maizuru City 407.938 5731.98 3874.18
Miyadome Ohi Town 407.831 2775.37 3874.18
Kariwa Kariwa Village 407.617 3574 3874.18
Ueno Satsuma-sendai City 394.248 2594.1 3874.18
Power Station-South 389.191 3777.9 3874.18
Radiation dose at JAEA Oarai (P6) 386.963 3827.66
Power Station- 385.546 3687.26 3874.18
Takae Satsuma-sendai City 379.551 2628.08 3874.18
Hokawaduura Genkai Town 378.015 4001.62 3874.18
Kou Itimatsu Suetsugu 377.929 2888.64 3874.18
Minato Satsuma-sendai City 377.656 2407.19 3874.18
Iwanai Iwanai Town 376.336 3922.38 3871.44
Hattari Kyowa Town 373.047 3814.83 3871.44
Chatsu Tomari Village 371.011 3645.03 3871.44
Oyama Maizuru City 358.223 3319.12 3874.18
Kodaira Satsuma-sendai City 355.545 2435.53 3874.18
Kayanuma Tomari Village 354.809 3243.18 3871.44
Anojiri Obama City 353.215 2718.72 3874.18
Kushi Genkai Town 349.738 5522.4 3874.18
Yamaguchi 348.715 4340.74 3865.97
Sadahongou Matsue City 348.228 3381.41 3874.18
Sakibe Karatsu City 347.801 5233.54 3874.18
Hirao Genkai Town 343.814 5516.72 3874.18
The Meteorological Obsevatory of kyowa Town 343.275 3616.74 3871.44
Minami-Horoni Kyowa Town 335.180 3390.33 3871.44
Kounoura Takahama Town 330.353 2865.97 3874.18
Kyoudomarisaki Karatsu City 328.622 5607.36 3874.18
Horikappu Jinja Tomari Village 328.230 3509.19 3871.44
Hukada-kita Matsue City 327.031 2781.01 3874.18
Radiation dose in KEK, Tsukuba 326.240 3846.82
Herokaruusu Tomari Village 324.242 3639.39 3871.44
Yorita Satsuma-sendai City 323.218 2848.98 3874.18
Kamoenai Kamoenai Village 322.032 3073.38 3871.44
Radiation dose in Onagawa (MP-6) 316.267 3824.93
Imamura Genkai Town 314.749 47520.8 3874.18
Yamanaka Takahama Town 314.185 3698.58 3874.18
Sendai (Miyagi) 312.585 1739.69 3865.97
Radiation dose in Onagawa (MP-1) 300.147 3824.93
Gumisaki Satsuma-sendai City 295.693 2299.6 3874.18
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3846.82
Aomori Aomori City 285.372 2337.57 3871.44
Misawa City hall Misawa City 283.728 4533.66 3871.44
Kashu Ikata Town 277.173 2373.2 3874.18
Noheji Town Office Noheji Town 272.004 2003.64 3871.44
Takasimamati 271.103 2526.13 3874.18
Radiation dose in Onagawa (MP-3) 270.563 3824.93
Kucho Ikata Town 269.545 2095.69 3874.18
Radiation dose in Marumori 269.436 3827.66
Kawanagata Ikata Town 266.821 2044.72 3874.18
Tochigi 260.733 2272.1 3865.97
Chikagawa Mutu City 256.719 2609.25 3871.44
Yokohama Town Office Yokohama Town 254.846 3197.91 3871.44
Tokyo 251.877 2679.05 3865.97
Hiranuma Rokkasho Village 251.186 2099.85 3871.44
Taisei Ikata Town 246.293 1534.96 3874.18
Chitose-daira Rokkasho Village 245.868 2264.01 3871.44
Gifu 243.951 3730.32 3865.97
Fukkoshi Yokohama Town 243.102 2196.09 3871.44
Shimane 240.651 3730.32 3865.97
Sunagomata Higashidoori Village 238.012 3175.26 3871.44
Obuchi Rokkasho Village 237.506 2524.35 3871.44
Tomari Rokkasho Village 230.636 3531.84 3871.44
kanagawa 226.339 2339.93 3865.97
Saitama 219.770 2034.72 3865.97
Ikatagoshi Ikata Town 217.515 1931.41 3874.18
Touhoku Branch office Touhoku Town 215.416 1828.17 3871.44
Radiation dose at Tohoku University 214.824 3827.66
Odanosawa Higashidoori Village 210.287 2530.02 3871.44
Kagawa 205.829 2611.22 3865.97
Oippe Higashidoori Village 205.182 2179.11 3871.44
Oita 200.921 2882.52 3865.97
Touhoku Town office Touhoku Town 200.811 8456.04 3871.44
Kuchogoshi Ikata Town 198.646 1959.76 3874.18
Minatoura Ikata Town 186.776 1761.49 3874.18
Radiation dose in Koyadori, Ojika 184.905 3822.19
Toyama 184.580 4985.06 3865.97
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2404.34 3860.5
Radiation dose in Tukahama, Ojika 183.417 3822.19
Chiba 182.407 1492.13 3865.97
Nara 182.387 2712.96 3865.97
Okayama 181.976 3526.85 3865.97
Yamagata 181.598 2780.78 3865.97
Ehime 180.745 2509.49 3865.97
Ishikawa 180.445 4323.78 3865.97
Niigata 177.483 5188.54 3865.97
Hiroshima 176.816 2339.93 3865.97
Mie 174.867 2675.66 3865.97
Fukui 170.045 3289.46 3865.97
Radiation dose in Terama, Ojika 168.036 3822.19
Yamanashi 164.561 2170.37 3865.97
Nagano 162.242 3303.03 3865.97
Saga 161.421 2916.43 3865.97
Tottori 161.392 2679.05 3865.97
Radiation dose in Enoshima, Ojika 160.091 3822.19
Osaka 159.103 2068.63 3865.97
Ibaraki-city Environment 157.249 3781.15
Aichi 149.345 2509.49 3865.97
Toyonoura Ikata Town 149.214 2022.05 3874.18
Shizuoka 148.639 2594.27 3865.97
Kyoto 144.522 2950.34 3865.97
Kagoshima 144.449 3197.9 3865.97
Tokushima 143.627 2272.1 3865.97
Gunma 143.572 1526.04 3865.97
Hyogo 139.710 2577.31 3865.97
Fukuoka 136.511 2679.05 3865.97
Wakayama 133.857 1899.07 3865.97
Radiation at Tamaki-cho Mie Japan 133.138 3781.15
Akita 132.832 2916.43 3865.97
Shiga 124.919 2068.63 3865.97
Nagasaki 109.459 2339.93 3865.97
Hokkaido 109.189 3560.76 3865.97
Kumamoto 103.568 2272.1 3865.97
Aomori 101.819 3459.02 3865.97
Miyazaki 100.354 2251.76 3865.97
Kochi 95.931 2577.31 3865.97
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2395.82 3846.82
Iwate 90.324 2848.61 3865.97
Environment Feeds from Ohta 83.623 3781.15
Okinawa 82.305 1949.94 3865.97
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