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Accumulated absorbed dose rate - T=13.03.2011 - 30.08.2015(see missing values above)

< Acc. Vmax < 2 * Acc. Vmax < 4 * Acc. Vmax > 4 * Ac.. Vmax
Stations: 353 Acc. abs. dose rate
μGy/T
Acc. Vmax
μGy/T
Acc. Vmean
μGy/T
Fukushima I MP7 696005.000 4377.6
Fukushima I MP8 570942.000 4377.6
Fukushima I MP6 240668.000 4377.6
Yamada Futaba Town 176983.000 3301.66 3934.37
Fukushima I MP2 140420.000 4377.6
Fukushima I MP5 111325.000 4377.6
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2770.7 4448.74
Fukushima I MP3 93730.602 4377.6
Fukushima I MP4 86821.500 4377.6
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2770.7 4448.74
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2719.58 4366.66
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2770.7 4448.74
Ono Okuma Town 38610.500 3048.55 3934.37
Shinzan Futaba Town 38332.801 2766.72 3934.37
Fukushima I MP1 31496.801 4377.6
Yonomori Tomioka Town 29815.900 3152.08 3934.37
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2770.7 4448.74
Tomioka Tomioka Town 25324.500 3393.67 3934.37
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2770.7 4448.74
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2770.7 4448.74
Shimo-Kooriyama Tomioka Town 13057.000 3370.68 3934.37
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2770.7 4448.74
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2770.7 4448.74
Kami-kooriyama Tomioka Town 11803.900 2645.93 3934.37
Fukushima II MP3 11060.600 4377.6
Fukushima II MP1 10903.000 4377.6
Kooriyama Futaba Town 10352.900 3083.06 3934.37
Fukushima II MP4 9696.330 4377.6
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2767.3 4443.26
Fukushima II MP5 9382.150 4377.6
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2770.7 4448.74
Matsudate Naraha Town 8410.890 3600.74 3934.37
Shigeoka Naraha Town 8115.970 3980.37 3934.37
Fukushima II MP2 7875.320 4377.6
Namie Namie Town 7321.210 2904.77 3934.37
Radiation dose at Shirasawa branch office, Motomiya 7287.920 4394.02
Fukushima II MP6 7062.690 4377.6
Fukushima II MP7 6511.580 4374.86
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2770.7 4448.74
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2770.7 4448.74
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2770.7 4448.74
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2770.7 4448.74
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2770.7 4448.74
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2770.7 4448.74
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2765.59 4440.53
Futatsunuma Hirono Town 3520.340 3451.2 3934.37
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2770.7 4448.74
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2770.7 4448.74
Radiation dose at Koriyama joint government building, Koriyama 3232.890 4391.28
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2770.7 4448.74
Kiyohashi Namie Town 3162.000 2548.12 3934.37
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2765.59 4440.53
Radiation dose at Agricultural center, Koriyama 3128.960 4391.28
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2770.7 4448.74
Radiation dose at Koriyama city office, Koriyama 2803.520 4391.28
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2770.7 4448.74
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2765.59 4440.53
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2770.7 4448.74
Yamadaoka Naraha Town 2205.340 3060.08 3934.37
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 4394.02
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2770.7 4448.74
Kuji Hitachi City 1990.890 6885.12 4459.68
Hitachinaka Hitachinaka City 1951.950 3023.41 4456.94
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2765.59 4440.53
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2765.59 4440.53
Momiyama Hokota City 1837.540 3449.09 4459.68
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2765.59 4440.53
Horiguchi Hitachinaka City 1779.410 3014.09 4462.42
Onuma Hitachi City 1776.950 2567.32 4456.94
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2770.7 4448.74
Tsukuriya Hokota City 1736.890 2901.41 4459.68
Radiation dose at Big palette Fukushima, Koriyama 1668.540 4391.28
Nemoto Hitachioomiya City 1633.190 3231.95 4456.94
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2770.7 4448.74
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2770.7 4448.74
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 4399.49
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2770.7 4448.74
Radiation dose at JAEA Oarai (P12) 1512.140 4415.9
Radiation dose at Ose administration center, Koriyama 1494.270 4391.28
Araji Hokota City 1437.760 2907.91 4459.68
Ishigami Tokai Village 1431.690 2647.13 4459.68
Mawatari Hitachinaka City 1422.870 3057.89 4459.68
Radiation dose at JAEA Oarai (P11) 1399.370 4415.9
Onuki Oarai Town 1387.990 3175.25 4459.68
Sawa Hitachinaka City 1353.770 2397.88 4456.94
Toyooka Tokai Village 1321.760 2914.44 4459.68
Ajigaura Hitachinaka City 1313.890 2867.03 4456.94
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2770.7 4448.74
Geiger Counter Feeds from Asao Kawasaki 1266.620 4369.39
Radiation dose at Tamokami elementary school, Koriyama 1256.140 4391.28
Isohama Oarai Town 1250.540 2767.59 4454.21
Ebisawa Ibaraki Town 1222.240 7514.25 4456.94
Muramatsu Tokai Village 1203.520 2940.53 4459.68
Kamitoda Hokota City 1184.740 2412.41 4459.68
Yanagisawa Hitachinaka City 1166.970 2456.52 4456.94
Tokushuku Hokota City 1159.730 2177.69 4459.68
Tasaki Hokota City 1153.300 2570.98 4429.58
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2770.7 4448.74
Kadobe Naka City 1086.580 5851.38 4456.94
Radiation dose at Date city office, Date 1076.050 4394.02
Oshinobe Tokai Village 1041.340 2744.93 4459.68
Oba Mito City 1037.670 9017.16 4459.68
Godai Naka City 1031.270 2379.79 4459.68
Ishikawa Mito City 1030.810 2805.33 4462.42
Isobe Hitachiota City 1013.130 13535.5 4459.68
Yatabe Ibaraki Town 996.127 2353.73 4459.68
Radiation dose at Motomiya city office, Motomiya 992.703 4394.02
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2765.59 4440.53
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2765.59 4440.53
Yokobori Naka City 930.280 2757.96 4459.68
Sugaya Naka City 926.186 4214.52 4462.42
Kounosu Naka City 926.087 2151.6 4459.68
Funaishikawa Tokai Village 900.399 2855.76 4459.68
Nukada Naka City 899.900 2578.75 4454.21
Uridura Naka City 890.113 2461.54 4454.21
Shiraki Tsuruga City 881.330 5225.72 4462.42
Motokomezaki Naka City 880.851 2291.09 4426.85
Shiraki pass Tsuruga City 850.284 5473.62 4462.42
Radiation dose in Yamamoto 846.633 4415.9
Yoshizawa Mito City 837.646 2490.65 4459.68
Radiation dose at JAEA Oarai (P7) 831.135 4415.9
Mayumi Hitachiota City 828.119 2471.09 4459.68
Urasoko Tsuruga City 826.465 4338.45 4462.42
Nemoto Hitachioomiya City 825.588 2782.34 4456.94
Takenami Mihama Town 804.283 4553.74 4462.42
Radiation dose at JAEA Oarai (P15) 780.207 4415.9
Tateishi Tsuruga City 780.092 3607.78 4462.42
Radiation dose at JAEA Oarai (P14) 770.174 4415.9
Radiation dose at JAEA Oarai (P13) 769.612 4415.9
Ukishima Kawasaki Ward 735.475 8513.82 4462.42
Kume Hitachiota City 713.958 2418.91 4459.68
Radiation dose at JAEA Oarai (P2) 712.011 4415.9
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2765.59 4440.53
Nyuu Mihama Town 674.787 4149.26 4462.42
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2770.7 4448.74
Radiation dose in Iwanuma 670.242 4415.9
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2770.7 4448.74
Tsuruga Tsuruga City 655.360 3659.96 4462.42
Shiohama Kawasaki Ward 653.536 2922.77 4462.42
Radiation dose in Kakuda 649.863 4415.9
Sakajiri Mihama Town 649.252 4840.82 4462.42
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3040.2 4462.42
Radiation dose in Onagawa (MP-2) 632.968 4413.17
Kumatori town Nishi primary school Station 631.491 3633.85 4462.42
Oshima Kawasaki Ward 630.402 2785.76 4462.42
Izumisano municipal Oike athletic field Station 629.920 4097.08 4462.42
Atom-kyoudou nursery school Station 625.566 3933.97 4462.42
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3581.68 4462.42
Nakamachi Omaezaki City 623.494 4612.46 4462.42
Uraga Yokosuka City 622.492 2185.53 4462.42
Goritoge Shika Town 622.143 4899.54 4462.42
Kumatori town Minami primary school Station 606.134 4168.84 4462.42
Radiation dose at JAEA Oarai (P1) 603.643 4418.64
Yamanotedai-No.1 Park Station 599.140 3888.29 4462.42
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4435.06
Noumi Shika Town 594.021 4847.32 4462.42
Radiation dose in Watari 591.851 4415.9
Hairando Yokosuka City 588.667 2740.08 4462.42
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2770.7 4448.74
Ningyotoge Kagamino Town 574.857 3888.29 4462.42
Ten-no Kagamino Town 569.960 4658.14 4462.42
Funagura Yokosuka City 563.909 2583.5 4462.42
Chidori Kawasaki Ward 560.211 2498.68 4462.42
Radiation dose at JAEA Oarai (P16) 556.365 4415.9
Shika Shika Town 551.376 4671.17 4462.42
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3033.66 4462.42
Sahara Yokosuka City 547.404 2420.39 4462.42
Kazanashi Shika Town 545.377 4384.13 4462.42
Akasumi Shika Town 544.970 4012.26 4462.42
Kurahashi Maizuru City 540.820 3653.43 4462.42
Obama Obama City 540.809 3268.52 4462.42
Sakuragaike community hall Omaezaki City 540.772 4729.89 4462.42
Shirowa primary school Omaezaki City 535.692 4632.03 4462.42
Radiation dose at JAEA Oarai (P5) 529.759 4415.9
Uenohara Omaezaki City 529.333 4762.53 4462.42
Kumano Shika Town 529.019 4547.24 4462.42
Izumisano municipal Hineno filtration plant Station 527.471 3920.94 4462.42
Nishi-hamasada Matsue City 525.089 4335.51 4446
Kouno Minami-Echizen Town 525.028 3288.1 4462.42
Kurihama Yokosuka City 523.708 2616.11 4462.42
Osaka prefectural Kumatori off-site-center Station 522.808 3614.28 4462.42
Ogasa branch Kikugawa City 522.039 4812.95 4448.74
Izumisano municipal Hineno primary scool Station 518.181 3138.06 4462.42
Shirasuna Omaezaki City 499.479 4664.67 4462.42
Jitougata primary school Makinohara City 498.059 4475.45 4462.42
Kataku Matsue City 497.007 3477.28 4462.42
Nishihemi Yokosuka City 496.917 2087.67 4462.42
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4435.06
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3425.1 4462.42
Otomi Takahama Town 494.821 3836.11 4462.42
Otsu Nanao City 493.895 3849.15 4462.42
The Observation point for comparison Tatsunokuchi 493.454 3170.66 4462.42
Hitsuhama Ohi Town 492.630 3568.64 4462.42
Kijiyama Misasa Town 489.284 3620.82 4462.42
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4435.06
Hiraba Omaezaki City 485.878 4664.67 4462.42
Tayu Matsue City 484.956 3627.36 4462.42
Hamaokakita primary school Omaezaki City 484.537 4780.44 4448.74
Oitomi Ayabe City 474.670 4599.42 4462.42
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4435.06
Kashiwazaki-shigai Kashiwazaki City 470.822 3659.96 4462.42
Mitsu Matsue City 466.897 3470.78 4462.42
Tonomachi Kawasaki Ward 463.967 4397.16 4462.42
Daitou branch Kakegawa City 463.829 4708.91 4448.74
Fukura Shika Town 462.493 4377.59 4462.42
Nagasawa Yokosuka City 462.365 2557.4 4462.42
The athletic field Station of Kinki University 461.661 2890.12 4462.42
Koura Matsue City 461.049 4142.73 4462.42
Sakurasan Ward Omaezaki City 459.434 4514.59 4462.42
Tsuchikawa Nanao City 458.915 4260.16 4462.42
Kumatori Town office Station 457.917 2981.48 4462.42
Shinkango Omaezaki City 449.013 5225.72 4462.42
Ogurui Takahama Town 448.279 3418.56 4462.42
Kusabue Omaezaki City 444.162 4925.61 4462.42
Omaezaki City monitoring center 443.946 4834.28 4462.42
Akawase Kagamino Town 442.246 2981.48 4462.42
Ibaraki 442.139 2188.03 4454.21
Hinode Town Yokosuka City 438.324 1722.34 4462.42
Nishiyama Kashiwazaki City 437.251 5180.04 4462.42
Kariwa Kariwa Village 436.307 3907.86 4462.42
Osaka prefectural Hineno high scool Station 435.745 3483.82 4462.42
Miyagawa Kashiwazaki City 435.245 3855.68 4462.42
Radiation dose in Natori 434.640 4415.9
Kami-koubu Matsue City 433.868 3790.43 4462.42
Shimo-Takamachi Kariwa Village 433.192 4253.66 4462.42
Osaka prefectural Sano supporting school Station 432.398 3796.97 4462.42
Arahama Kashiwazaki City 428.874 3973.12 4462.42
Doai Kashiwazaki City 425.681 3738.25 4462.42
Owashi Matsue City 424.452 3705.65 4462.42
Okayasu Maizuru City 422.568 4364.56 4462.42
Katsuyama Kariwa Village 421.280 3973.12 4462.42
Kita-koubu Matsue City 420.683 4064.44 4462.42
Kichisaka Maizuru City 413.065 5304.01 4462.42
Nagai Ohi Town 410.699 3855.12 4454.21
Shiokumi Maizuru City 407.938 6602.3 4462.42
Miyadome Ohi Town 407.831 3196.77 4462.42
Kariwa Kariwa Village 407.617 4116.66 4462.42
Ueno Satsuma-sendai City 394.248 2987.98 4462.42
Power Station-South 389.191 4351.52 4462.42
Radiation dose at JAEA Oarai (P6) 386.963 4415.9
Power Station- 385.546 4247.12 4462.42
Takae Satsuma-sendai City 379.551 3027.12 4462.42
Hokawaduura Genkai Town 378.015 4609.21 4462.42
Kou Itimatsu Suetsugu 377.929 3327.24 4462.42
Minato Satsuma-sendai City 377.656 2772.69 4462.42
Iwanai Iwanai Town 376.336 4518.36 4459.68
Hattari Kyowa Town 373.047 4394.47 4459.68
Chatsu Tomari Village 371.011 4198.87 4459.68
Oyama Maizuru City 358.223 3823.08 4462.42
Kodaira Satsuma-sendai City 355.545 2805.33 4462.42
Kayanuma Tomari Village 354.809 3735.96 4459.68
Anojiri Obama City 353.215 3131.52 4462.42
Kushi Genkai Town 349.738 6360.9 4462.42
Yamaguchi 348.715 5001.22 4454.21
Sadahongou Matsue City 348.228 3894.83 4462.42
Sakibe Karatsu City 347.801 6028.18 4462.42
Hirao Genkai Town 343.814 6354.36 4462.42
The Meteorological Obsevatory of kyowa Town 343.275 4166.28 4459.68
Minami-Horoni Kyowa Town 335.180 3905.47 4459.68
Kounoura Takahama Town 330.353 3301.13 4462.42
Kyoudomarisaki Karatsu City 328.622 6458.76 4462.42
Horikappu Jinja Tomari Village 328.230 4042.39 4459.68
Hukada-kita Matsue City 327.031 3203.27 4462.42
Radiation dose in KEK, Tsukuba 326.240 4435.06
Herokaruusu Tomari Village 324.242 4192.37 4459.68
Yorita Satsuma-sendai City 323.218 3281.56 4462.42
Kamoenai Kamoenai Village 322.032 3540.36 4459.68
Radiation dose in Onagawa (MP-6) 316.267 4413.17
Imamura Genkai Town 314.749 54736.2 4462.42
Yamanaka Takahama Town 314.185 4260.16 4462.42
Sendai (Miyagi) 312.585 2004.39 4454.21
Radiation dose in Onagawa (MP-1) 300.147 4413.17
Gumisaki Satsuma-sendai City 295.693 2648.76 4462.42
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4435.06
Aomori Aomori City 285.372 2692.75 4459.68
Misawa City hall Misawa City 283.728 5222.52 4459.68
Kashu Ikata Town 277.173 2733.54 4462.42
Noheji Town Office Noheji Town 272.004 2308.08 4459.68
Takasimamati 271.103 2909.69 4462.42
Radiation dose in Onagawa (MP-3) 270.563 4413.17
Kucho Ikata Town 269.545 2413.89 4462.42
Radiation dose in Marumori 269.436 4415.9
Kawanagata Ikata Town 266.821 2355.18 4462.42
Tochigi 260.733 2617.82 4454.21
Chikagawa Mutu City 256.719 3005.71 4459.68
Yokohama Town Office Yokohama Town 254.846 3683.81 4459.68
Tokyo 251.877 3086.69 4454.21
Hiranuma Rokkasho Village 251.186 2418.91 4459.68
Taisei Ikata Town 246.293 1768.02 4462.42
Chitose-daira Rokkasho Village 245.868 2608.01 4459.68
Gifu 243.951 4297.92 4454.21
Fukkoshi Yokohama Town 243.102 2529.77 4459.68
Shimane 240.651 4297.92 4454.21
Sunagomata Higashidoori Village 238.012 3657.72 4459.68
Obuchi Rokkasho Village 237.506 2907.91 4459.68
Tomari Rokkasho Village 230.636 4068.48 4459.68
kanagawa 226.339 2695.97 4454.21
Saitama 219.770 2344.32 4454.21
Ikatagoshi Ikata Town 217.515 2224.67 4462.42
Touhoku Branch office Touhoku Town 215.416 2105.95 4459.68
Radiation dose at Tohoku University 214.824 4415.9
Odanosawa Higashidoori Village 210.287 2914.44 4459.68
Kagawa 205.829 3008.54 4454.21
Oippe Higashidoori Village 205.182 2510.21 4459.68
Oita 200.921 3321.12 4454.21
Touhoku Town office Touhoku Town 200.811 9740.88 4459.68
Kuchogoshi Ikata Town 198.646 2257.32 4462.42
Minatoura Ikata Town 186.776 2028.95 4462.42
Radiation dose in Koyadori, Ojika 184.905 4410.43
Toyama 184.580 5743.58 4454.21
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2770.7 4448.74
Radiation dose in Tukahama, Ojika 183.417 4410.43
Chiba 182.407 1719.17 4454.21
Nara 182.387 3125.76 4454.21
Okayama 181.976 4063.49 4454.21
Yamagata 181.598 3203.9 4454.21
Ehime 180.745 2891.33 4454.21
Ishikawa 180.445 4981.68 4454.21
Niigata 177.483 5978.02 4454.21
Hiroshima 176.816 2695.97 4454.21
Mie 174.867 3082.78 4454.21
Fukui 170.045 3789.98 4454.21
Radiation dose in Terama, Ojika 168.036 4410.43
Yamanashi 164.561 2500.61 4454.21
Nagano 162.242 3805.61 4454.21
Saga 161.421 3360.19 4454.21
Tottori 161.392 3086.69 4454.21
Radiation dose in Enoshima, Ojika 160.091 4410.43
Osaka 159.103 2383.39 4454.21
Ibaraki-city Environment 157.249 4369.39
Aichi 149.345 2891.33 4454.21
Toyonoura Ikata Town 149.214 2329.07 4462.42
Shizuoka 148.639 2989.01 4454.21
Kyoto 144.522 3399.26 4454.21
Kagoshima 144.449 3684.49 4454.21
Tokushima 143.627 2617.82 4454.21
Gunma 143.572 1758.24 4454.21
Hyogo 139.710 2969.47 4454.21
Fukuoka 136.511 3086.69 4454.21
Wakayama 133.857 2188.03 4454.21
Radiation at Tamaki-cho Mie Japan 133.138 4369.39
Akita 132.832 3360.19 4454.21
Shiga 124.919 2383.39 4454.21
Nagasaki 109.459 2695.97 4454.21
Hokkaido 109.189 4102.56 4454.21
Kumamoto 103.568 2617.82 4454.21
Aomori 101.819 3985.34 4454.21
Miyazaki 100.354 2594.38 4454.21
Kochi 95.931 2969.47 4454.21
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2762.18 4435.06
Iwate 90.324 3282.05 4454.21
Environment Feeds from Ohta 83.623 4369.39
Okinawa 82.305 2246.64 4454.21
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 Nuclear power plant

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