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Accumulated absorbed dose rate - T=13.03.2011 - 25.06.2016(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 5198.4
Fukushima I MP8 570942.000 5198.4
Fukushima I MP6 240668.000 5198.4
Yamada Futaba Town 176983.000 3990.46 4755.17
Fukushima I MP2 140420.000 5198.4
Fukushima I MP5 111325.000 5198.4
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3281.9 5269.54
Fukushima I MP3 93730.602 5198.4
Fukushima I MP4 86821.500 5198.4
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3281.9 5269.54
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3230.78 5187.46
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3281.9 5269.54
Ono Okuma Town 38610.500 3684.55 4755.17
Shinzan Futaba Town 38332.801 3343.93 4755.17
Fukushima I MP1 31496.801 5198.4
Yonomori Tomioka Town 29815.900 3809.68 4755.17
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3281.9 5269.54
Tomioka Tomioka Town 25324.500 4101.67 4755.17
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3281.9 5269.54
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3281.9 5269.54
Shimo-Kooriyama Tomioka Town 13057.000 4073.89 4755.17
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3281.9 5269.54
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3281.9 5269.54
Kami-kooriyama Tomioka Town 11803.900 3197.93 4755.17
Fukushima II MP3 11060.600 5198.4
Fukushima II MP1 10903.000 5198.4
Kooriyama Futaba Town 10352.900 3726.26 4755.17
Fukushima II MP4 9696.330 5198.4
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3278.5 5264.06
Fukushima II MP5 9382.150 5198.4
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3281.9 5269.54
Matsudate Naraha Town 8410.890 4351.94 4755.17
Shigeoka Naraha Town 8115.970 4810.77 4755.17
Fukushima II MP2 7875.320 5198.4
Namie Namie Town 7321.210 3510.77 4755.17
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5214.82
Fukushima II MP6 7062.690 5198.4
Fukushima II MP7 6511.580 5195.66
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3281.9 5269.54
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3281.9 5269.54
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3281.9 5269.54
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3281.9 5269.54
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3281.9 5269.54
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3281.9 5269.54
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3276.79 5261.33
Futatsunuma Hirono Town 3520.340 4171.2 4755.17
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3281.9 5269.54
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3281.9 5269.54
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5212.08
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3281.9 5269.54
Kiyohashi Namie Town 3162.000 3079.72 4755.17
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3276.79 5261.33
Radiation dose at Agricultural center, Koriyama 3128.960 5212.08
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3281.9 5269.54
Radiation dose at Koriyama city office, Koriyama 2803.520 5212.08
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3281.9 5269.54
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3276.79 5261.33
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3281.9 5269.54
Yamadaoka Naraha Town 2205.340 3698.48 4755.17
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5214.82
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3281.9 5269.54
Kuji Hitachi City 1990.890 8152.32 5280.48
Hitachinaka Hitachinaka City 1951.950 3580.21 5277.74
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3276.79 5261.33
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3276.79 5261.33
Momiyama Hokota City 1837.540 4083.9 5280.48
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3276.79 5261.33
Horiguchi Hitachinaka City 1779.410 3568.49 5283.22
Onuma Hitachi City 1776.950 3040.12 5277.74
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3281.9 5269.54
Tsukuriya Hokota City 1736.890 3435.42 5280.48
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5212.08
Nemoto Hitachioomiya City 1633.190 3827.15 5277.74
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3281.9 5269.54
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3281.9 5269.54
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5220.29
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3281.9 5269.54
Radiation dose at JAEA Oarai (P12) 1512.140 5236.7
Radiation dose at Ose administration center, Koriyama 1494.270 5212.08
Araji Hokota City 1437.760 3443.1 5280.48
Ishigami Tokai Village 1431.690 3134.34 5280.48
Mawatari Hitachinaka City 1422.870 3620.7 5280.48
Radiation dose at JAEA Oarai (P11) 1399.370 5236.7
Onuki Oarai Town 1387.990 3759.66 5280.48
Sawa Hitachinaka City 1353.770 2839.47 5277.74
Toyooka Tokai Village 1321.760 3450.84 5280.48
Ajigaura Hitachinaka City 1313.890 3395.02 5277.74
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3281.9 5269.54
Geiger Counter Feeds from Asao Kawasaki 1266.620 5190.19
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5212.08
Isohama Oarai Town 1250.540 3277.58 5275.01
Ebisawa Ibaraki Town 1222.240 8898.09 5277.74
Muramatsu Tokai Village 1203.520 3481.74 5280.48
Kamitoda Hokota City 1184.740 2856.42 5280.48
Yanagisawa Hitachinaka City 1166.970 2908.92 5277.74
Tokushuku Hokota City 1159.730 2578.5 5280.48
Tasaki Hokota City 1153.300 3047.39 5250.38
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3281.9 5269.54
Kadobe Naka City 1086.580 6928.98 5277.74
Radiation dose at Date city office, Date 1076.050 5214.82
Oshinobe Tokai Village 1041.340 3250.14 5280.48
Oba Mito City 1037.670 10676.8 5280.48
Godai Naka City 1031.270 2817.78 5280.48
Ishikawa Mito City 1030.810 3321.34 5283.22
Isobe Hitachiota City 1013.130 16026.7 5280.48
Yatabe Ibaraki Town 996.127 2786.94 5280.48
Radiation dose at Motomiya city office, Motomiya 992.703 5214.82
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3276.79 5261.33
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3276.79 5261.33
Yokobori Naka City 930.280 3265.56 5280.48
Sugaya Naka City 926.186 4989.72 5283.22
Kounosu Naka City 926.087 2547.6 5280.48
Funaishikawa Tokai Village 900.399 3381.36 5280.48
Nukada Naka City 899.900 3053.95 5275.01
Uridura Naka City 890.113 2915.14 5275.01
Shiraki Tsuruga City 881.330 6186.92 5283.22
Motokomezaki Naka City 880.851 2715.89 5247.65
Shiraki pass Tsuruga City 850.284 6480.42 5283.22
Radiation dose in Yamamoto 846.633 5236.7
Yoshizawa Mito City 837.646 2949.06 5280.48
Radiation dose at JAEA Oarai (P7) 831.135 5236.7
Mayumi Hitachiota City 828.119 2925.9 5280.48
Urasoko Tsuruga City 826.465 5136.44 5283.22
Nemoto Hitachioomiya City 825.588 3294.75 5277.74
Takenami Mihama Town 804.283 5391.34 5283.22
Radiation dose at JAEA Oarai (P15) 780.207 5236.7
Tateishi Tsuruga City 780.092 4271.39 5283.22
Radiation dose at JAEA Oarai (P14) 770.174 5236.7
Radiation dose at JAEA Oarai (P13) 769.612 5236.7
Ukishima Kawasaki Ward 735.475 10079.8 5283.22
Kume Hitachiota City 713.958 2864.1 5280.48
Radiation dose at JAEA Oarai (P2) 712.011 5236.7
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3276.79 5261.33
Nyuu Mihama Town 674.787 4912.46 5283.22
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3281.9 5269.54
Radiation dose in Iwanuma 670.242 5236.7
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3281.9 5269.54
Tsuruga Tsuruga City 655.360 4333.16 5283.22
Shiohama Kawasaki Ward 653.536 3460.37 5283.22
Radiation dose in Kakuda 649.863 5236.7
Sakajiri Mihama Town 649.252 5731.22 5283.22
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3599.4 5283.22
Radiation dose in Onagawa (MP-2) 632.968 5233.97
Kumatori town Nishi primary school Station 631.491 4302.25 5283.22
Oshima Kawasaki Ward 630.402 3298.16 5283.22
Izumisano municipal Oike athletic field Station 629.920 4850.69 5283.22
Atom-kyoudou nursery school Station 625.566 4657.57 5283.22
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4240.48 5283.22
Nakamachi Omaezaki City 623.494 5460.85 5283.22
Uraga Yokosuka City 622.492 2587.52 5283.22
Goritoge Shika Town 622.143 5800.74 5283.22
Kumatori town Minami primary school Station 606.134 4935.64 5283.22
Radiation dose at JAEA Oarai (P1) 603.643 5239.44
Yamanotedai-No.1 Park Station 599.140 4603.49 5283.22
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 5255.86
Noumi Shika Town 594.021 5738.92 5283.22
Radiation dose in Watari 591.851 5236.7
Hairando Yokosuka City 588.667 3244.08 5283.22
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3281.9 5269.54
Ningyotoge Kagamino Town 574.857 4603.49 5283.22
Ten-no Kagamino Town 569.960 5514.94 5283.22
Funagura Yokosuka City 563.909 3058.7 5283.22
Chidori Kawasaki Ward 560.211 2958.28 5283.22
Radiation dose at JAEA Oarai (P16) 556.365 5236.7
Shika Shika Town 551.376 5530.37 5283.22
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3591.66 5283.22
Sahara Yokosuka City 547.404 2865.59 5283.22
Kazanashi Shika Town 545.377 5190.53 5283.22
Akasumi Shika Town 544.970 4750.26 5283.22
Kurahashi Maizuru City 540.820 4325.42 5283.22
Obama Obama City 540.809 3869.72 5283.22
Sakuragaike community hall Omaezaki City 540.772 5599.88 5283.22
Shirowa primary school Omaezaki City 535.692 5484.02 5283.22
Radiation dose at JAEA Oarai (P5) 529.759 5236.7
Uenohara Omaezaki City 529.333 5638.54 5283.22
Kumano Shika Town 529.019 5383.64 5283.22
Izumisano municipal Hineno filtration plant Station 527.471 4642.14 5283.22
Nishi-hamasada Matsue City 525.089 5135.92 5266.8
Kouno Minami-Echizen Town 525.028 3892.9 5283.22
Kurihama Yokosuka City 523.708 3097.31 5283.22
Osaka prefectural Kumatori off-site-center Station 522.808 4279.08 5283.22
Ogasa branch Kikugawa City 522.039 5700.94 5269.54
Izumisano municipal Hineno primary scool Station 518.181 3715.26 5283.22
Shirasuna Omaezaki City 499.479 5522.68 5283.22
Jitougata primary school Makinohara City 498.059 5298.65 5283.22
Kataku Matsue City 497.007 4116.88 5283.22
Nishihemi Yokosuka City 496.917 2471.66 5283.22
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 5255.86
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4055.1 5283.22
Otomi Takahama Town 494.821 4541.71 5283.22
Otsu Nanao City 493.895 4557.14 5283.22
The Observation point for comparison Tatsunokuchi 493.454 3753.86 5283.22
Hitsuhama Ohi Town 492.630 4225.04 5283.22
Kijiyama Misasa Town 489.284 4286.82 5283.22
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 5255.86
Hiraba Omaezaki City 485.878 5522.68 5283.22
Tayu Matsue City 484.956 4294.56 5283.22
Hamaokakita primary school Omaezaki City 484.537 5662.44 5269.54
Oitomi Ayabe City 474.670 5445.42 5283.22
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 5255.86
Kashiwazaki-shigai Kashiwazaki City 470.822 4333.16 5283.22
Mitsu Matsue City 466.897 4109.18 5283.22
Tonomachi Kawasaki Ward 463.967 5205.96 5283.22
Daitou branch Kakegawa City 463.829 5577.71 5269.54
Fukura Shika Town 462.493 5182.79 5283.22
Nagasawa Yokosuka City 462.365 3027.79 5283.22
The athletic field Station of Kinki University 461.661 3421.72 5283.22
Koura Matsue City 461.049 4904.72 5283.22
Sakurasan Ward Omaezaki City 459.434 5344.99 5283.22
Tsuchikawa Nanao City 458.915 5043.76 5283.22
Kumatori Town office Station 457.917 3529.88 5283.22
Shinkango Omaezaki City 449.013 6186.92 5283.22
Ogurui Takahama Town 448.279 4047.36 5283.22
Kusabue Omaezaki City 444.162 5831.6 5283.22
Omaezaki City monitoring center 443.946 5723.48 5283.22
Akawase Kagamino Town 442.246 3529.88 5283.22
Ibaraki 442.139 2591.23 5275.01
Hinode Town Yokosuka City 438.324 2039.14 5283.22
Nishiyama Kashiwazaki City 437.251 6132.84 5283.22
Kariwa Kariwa Village 436.307 4626.66 5283.22
Osaka prefectural Hineno high scool Station 435.745 4124.62 5283.22
Miyagawa Kashiwazaki City 435.245 4564.88 5283.22
Radiation dose in Natori 434.640 5236.7
Kami-koubu Matsue City 433.868 4487.63 5283.22
Shimo-Takamachi Kariwa Village 433.192 5036.06 5283.22
Osaka prefectural Sano supporting school Station 432.398 4495.37 5283.22
Arahama Kashiwazaki City 428.874 4703.92 5283.22
Doai Kashiwazaki City 425.681 4425.85 5283.22
Owashi Matsue City 424.452 4387.25 5283.22
Okayasu Maizuru City 422.568 5167.36 5283.22
Katsuyama Kariwa Village 421.280 4703.92 5283.22
Kita-koubu Matsue City 420.683 4812.04 5283.22
Kichisaka Maizuru City 413.065 6279.61 5283.22
Nagai Ohi Town 410.699 4565.52 5275.01
Shiokumi Maizuru City 407.938 7816.7 5283.22
Miyadome Ohi Town 407.831 3784.78 5283.22
Kariwa Kariwa Village 407.617 4873.86 5283.22
Ueno Satsuma-sendai City 394.248 3537.58 5283.22
Power Station-South 389.191 5151.92 5283.22
Radiation dose at JAEA Oarai (P6) 386.963 5236.7
Power Station- 385.546 5028.32 5283.22
Takae Satsuma-sendai City 379.551 3583.92 5283.22
Hokawaduura Genkai Town 378.015 5457.01 5283.22
Kou Itimatsu Suetsugu 377.929 3939.24 5283.22
Minato Satsuma-sendai City 377.656 3282.68 5283.22
Iwanai Iwanai Town 376.336 5349.96 5280.48
Hattari Kyowa Town 373.047 5203.26 5280.48
Chatsu Tomari Village 371.011 4971.66 5280.48
Oyama Maizuru City 358.223 4526.28 5283.22
Kodaira Satsuma-sendai City 355.545 3321.34 5283.22
Kayanuma Tomari Village 354.809 4423.56 5280.48
Anojiri Obama City 353.215 3707.52 5283.22
Kushi Genkai Town 349.738 7530.9 5283.22
Yamaguchi 348.715 5922.82 5275.01
Sadahongou Matsue City 348.228 4611.23 5283.22
Sakibe Karatsu City 347.801 7136.98 5283.22
Hirao Genkai Town 343.814 7523.16 5283.22
The Meteorological Obsevatory of kyowa Town 343.275 4933.08 5280.48
Minami-Horoni Kyowa Town 335.180 4624.26 5280.48
Kounoura Takahama Town 330.353 3908.33 5283.22
Kyoudomarisaki Karatsu City 328.622 7646.76 5283.22
Horikappu Jinja Tomari Village 328.230 4786.38 5280.48
Hukada-kita Matsue City 327.031 3792.47 5283.22
Radiation dose in KEK, Tsukuba 326.240 5255.86
Herokaruusu Tomari Village 324.242 4963.98 5280.48
Yorita Satsuma-sendai City 323.218 3885.16 5283.22
Kamoenai Kamoenai Village 322.032 4191.96 5280.48
Radiation dose in Onagawa (MP-6) 316.267 5233.97
Imamura Genkai Town 314.749 64804.2 5283.22
Yamanaka Takahama Town 314.185 5043.76 5283.22
Sendai (Miyagi) 312.585 2373.75 5275.01
Radiation dose in Onagawa (MP-1) 300.147 5233.97
Gumisaki Satsuma-sendai City 295.693 3135.96 5283.22
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 5255.86
Aomori Aomori City 285.372 3188.34 5280.48
Misawa City hall Misawa City 283.728 6183.72 5280.48
Kashu Ikata Town 277.173 3236.34 5283.22
Noheji Town Office Noheji Town 272.004 2732.88 5280.48
Takasimamati 271.103 3444.89 5283.22
Radiation dose in Onagawa (MP-3) 270.563 5233.97
Kucho Ikata Town 269.545 2857.9 5283.22
Radiation dose in Marumori 269.436 5236.7
Kawanagata Ikata Town 266.821 2788.38 5283.22
Tochigi 260.733 3100.22 5275.01
Chikagawa Mutu City 256.719 3558.9 5280.48
Yokohama Town Office Yokohama Town 254.846 4361.82 5280.48
Tokyo 251.877 3655.49 5275.01
Hiranuma Rokkasho Village 251.186 2864.1 5280.48
Taisei Ikata Town 246.293 2093.22 5283.22
Chitose-daira Rokkasho Village 245.868 3088.02 5280.48
Gifu 243.951 5089.92 5275.01
Fukkoshi Yokohama Town 243.102 2995.38 5280.48
Shimane 240.651 5089.92 5275.01
Sunagomata Higashidoori Village 238.012 4330.92 5280.48
Obuchi Rokkasho Village 237.506 3443.1 5280.48
Tomari Rokkasho Village 230.636 4817.28 5280.48
kanagawa 226.339 3192.77 5275.01
Saitama 219.770 2776.32 5275.01
Ikatagoshi Ikata Town 217.515 2633.87 5283.22
Touhoku Branch office Touhoku Town 215.416 2493.54 5280.48
Radiation dose at Tohoku University 214.824 5236.7
Odanosawa Higashidoori Village 210.287 3450.84 5280.48
Kagawa 205.829 3562.94 5275.01
Oippe Higashidoori Village 205.182 2972.22 5280.48
Oita 200.921 3933.12 5275.01
Touhoku Town office Touhoku Town 200.811 11533.7 5280.48
Kuchogoshi Ikata Town 198.646 2672.52 5283.22
Minatoura Ikata Town 186.776 2402.15 5283.22
Radiation dose in Koyadori, Ojika 184.905 5231.23
Toyama 184.580 6801.98 5275.01
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3281.9 5269.54
Radiation dose in Tukahama, Ojika 183.417 5231.23
Chiba 182.407 2035.97 5275.01
Nara 182.387 3701.76 5275.01
Okayama 181.976 4812.29 5275.01
Yamagata 181.598 3794.3 5275.01
Ehime 180.745 3424.13 5275.01
Ishikawa 180.445 5899.68 5275.01
Niigata 177.483 7079.62 5275.01
Hiroshima 176.816 3192.77 5275.01
Mie 174.867 3650.86 5275.01
Fukui 170.045 4488.38 5275.01
Radiation dose in Terama, Ojika 168.036 5231.23
Yamanashi 164.561 2961.41 5275.01
Nagano 162.242 4506.89 5275.01
Saga 161.421 3979.39 5275.01
Tottori 161.392 3655.49 5275.01
Radiation dose in Enoshima, Ojika 160.091 5231.23
Osaka 159.103 2822.59 5275.01
Ibaraki-city Environment 157.249 5190.19
Aichi 149.345 3424.13 5275.01
Toyonoura Ikata Town 149.214 2757.47 5283.22
Shizuoka 148.639 3539.81 5275.01
Kyoto 144.522 4025.66 5275.01
Kagoshima 144.449 4363.45 5275.01
Tokushima 143.627 3100.22 5275.01
Gunma 143.572 2082.24 5275.01
Hyogo 139.710 3516.67 5275.01
Fukuoka 136.511 3655.49 5275.01
Wakayama 133.857 2591.23 5275.01
Radiation at Tamaki-cho Mie Japan 133.138 5190.19
Akita 132.832 3979.39 5275.01
Shiga 124.919 2822.59 5275.01
Nagasaki 109.459 3192.77 5275.01
Hokkaido 109.189 4858.56 5275.01
Kumamoto 103.568 3100.22 5275.01
Aomori 101.819 4719.74 5275.01
Miyazaki 100.354 3072.46 5275.01
Kochi 95.931 3516.67 5275.01
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3273.38 5255.86
Iwate 90.324 3886.85 5275.01
Environment Feeds from Ohta 83.623 5190.19
Okinawa 82.305 2660.64 5275.01
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