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Accumulated absorbed dose rate - T=13.03.2011 - 20.08.2017(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 6350.26
Fukushima I MP8 570942.000 6350.26
Fukushima I MP6 240668.000 6350.26
Yamada Futaba Town 176983.000 4957.08 5907.02
Fukushima I MP2 140420.000 6350.26
Fukushima I MP5 111325.000 6350.26
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3999.29 6421.39
Fukushima I MP3 93730.602 6350.26
Fukushima I MP4 86821.500 6350.26
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3999.29 6421.39
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3948.17 6339.31
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3999.29 6421.39
Ono Okuma Town 38610.500 4577.06 5907.02
Shinzan Futaba Town 38332.801 4153.93 5907.02
Fukushima I MP1 31496.801 6350.26
Yonomori Tomioka Town 29815.900 4732.51 5907.02
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3999.29 6421.39
Tomioka Tomioka Town 25324.500 5095.22 5907.02
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3999.29 6421.39
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3999.29 6421.39
Shimo-Kooriyama Tomioka Town 13057.000 5060.71 5907.02
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3999.29 6421.39
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3999.29 6421.39
Kami-kooriyama Tomioka Town 11803.900 3972.58 5907.02
Fukushima II MP3 11060.600 6350.26
Fukushima II MP1 10903.000 6350.26
Kooriyama Futaba Town 10352.900 4628.88 5907.02
Fukushima II MP4 9696.330 6350.26
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3995.88 6415.92
Fukushima II MP5 9382.150 6350.26
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3999.29 6421.39
Matsudate Naraha Town 8410.890 5406.12 5907.02
Shigeoka Naraha Town 8115.970 5976.09 5907.02
Fukushima II MP2 7875.320 6350.26
Namie Namie Town 7321.210 4361.2 5907.02
Radiation dose at Shirasawa branch office, Motomiya 7287.920 6366.67
Fukushima II MP6 7062.690 6350.26
Fukushima II MP7 6511.580 6347.52
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3999.29 6421.39
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3999.29 6421.39
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3999.29 6421.39
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3999.29 6421.39
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3999.29 6421.39
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3999.29 6421.39
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3994.18 6413.18
Futatsunuma Hirono Town 3520.340 5181.6 5907.02
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3999.29 6421.39
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3999.29 6421.39
Radiation dose at Koriyama joint government building, Koriyama 3232.890 6363.94
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3999.29 6421.39
Kiyohashi Namie Town 3162.000 3825.73 5907.02
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3994.18 6413.18
Radiation dose at Agricultural center, Koriyama 3128.960 6363.94
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3999.29 6421.39
Radiation dose at Koriyama city office, Koriyama 2803.520 6363.94
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3999.29 6421.39
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3994.18 6413.18
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3999.29 6421.39
Yamadaoka Naraha Town 2205.340 4594.37 5907.02
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 6366.67
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3999.29 6421.39
Kuji Hitachi City 1990.890 9930.62 6432.34
Hitachinaka Hitachinaka City 1951.950 4361.58 6429.6
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3994.18 6413.18
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3994.18 6413.18
Momiyama Hokota City 1837.540 4974.73 6432.34
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3994.18 6413.18
Horiguchi Hitachinaka City 1779.410 4346.5 6435.07
Onuma Hitachi City 1776.950 3703.62 6429.6
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3999.29 6421.39
Tsukuriya Hokota City 1736.890 4184.8 6432.34
Radiation dose at Big palette Fukushima, Koriyama 1668.540 6363.94
Nemoto Hitachioomiya City 1633.190 4662.42 6429.6
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3999.29 6421.39
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3999.29 6421.39
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 6372.14
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3999.29 6421.39
Radiation dose at JAEA Oarai (P12) 1512.140 6388.56
Radiation dose at Ose administration center, Koriyama 1494.270 6363.94
Araji Hokota City 1437.760 4194.17 6432.34
Ishigami Tokai Village 1431.690 3818.04 6432.34
Mawatari Hitachinaka City 1422.870 4410.49 6432.34
Radiation dose at JAEA Oarai (P11) 1399.370 6388.56
Onuki Oarai Town 1387.990 4579.77 6432.34
Sawa Hitachinaka City 1353.770 3459.18 6429.6
Toyooka Tokai Village 1321.760 4203.59 6432.34
Ajigaura Hitachinaka City 1313.890 4135.98 6429.6
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3999.29 6421.39
Geiger Counter Feeds from Asao Kawasaki 1266.620 6342.05
Radiation dose at Tamokami elementary school, Koriyama 1256.140 6363.94
Isohama Oarai Town 1250.540 3993.28 6426.86
Ebisawa Ibaraki Town 1222.240 10840.1 6429.6
Muramatsu Tokai Village 1203.520 4241.22 6432.34
Kamitoda Hokota City 1184.740 3479.5 6432.34
Yanagisawa Hitachinaka City 1166.970 3543.78 6429.6
Tokushuku Hokota City 1159.730 3140.95 6432.34
Tasaki Hokota City 1153.300 3715.94 6402.24
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3999.29 6421.39
Kadobe Naka City 1086.580 8441.22 6429.6
Radiation dose at Date city office, Date 1076.050 6366.67
Oshinobe Tokai Village 1041.340 3959.1 6432.34
Oba Mito City 1037.670 13005.7 6432.34
Godai Naka City 1031.270 3432.44 6432.34
Ishikawa Mito City 1030.810 4045.46 6435.07
Isobe Hitachiota City 1013.130 19522.7 6432.34
Yatabe Ibaraki Town 996.127 3394.86 6432.34
Radiation dose at Motomiya city office, Motomiya 992.703 6366.67
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3994.18 6413.18
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3994.18 6413.18
Yokobori Naka City 930.280 3977.89 6432.34
Sugaya Naka City 926.186 6077.59 6435.07
Kounosu Naka City 926.087 3103.32 6432.34
Funaishikawa Tokai Village 900.399 4118.95 6432.34
Nukada Naka City 899.900 3720.82 6426.86
Uridura Naka City 890.113 3551.69 6426.86
Shiraki Tsuruga City 881.330 7535.81 6435.07
Motokomezaki Naka City 880.851 3312.02 6399.5
Shiraki pass Tsuruga City 850.284 7893.29 6435.07
Radiation dose in Yamamoto 846.633 6388.56
Yoshizawa Mito City 837.646 3592.35 6432.34
Radiation dose at JAEA Oarai (P7) 831.135 6388.56
Mayumi Hitachiota City 828.119 3564.13 6432.34
Urasoko Tsuruga City 826.465 6256.3 6435.07
Nemoto Hitachioomiya City 825.588 4013.82 6429.6
Takenami Mihama Town 804.283 6566.77 6435.07
Radiation dose at JAEA Oarai (P15) 780.207 6388.56
Tateishi Tsuruga City 780.092 5202.64 6435.07
Radiation dose at JAEA Oarai (P14) 770.174 6388.56
Radiation dose at JAEA Oarai (P13) 769.612 6388.56
Ukishima Kawasaki Ward 735.475 12277.4 6435.07
Kume Hitachiota City 713.958 3488.87 6432.34
Radiation dose at JAEA Oarai (P2) 712.011 6388.56
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3994.18 6413.18
Nyuu Mihama Town 674.787 5983.49 6435.07
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3999.29 6421.39
Radiation dose in Iwanuma 670.242 6388.56
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3999.29 6421.39
Tsuruga Tsuruga City 655.360 5277.89 6435.07
Shiohama Kawasaki Ward 653.536 4214.8 6435.07
Radiation dose in Kakuda 649.863 6388.56
Sakajiri Mihama Town 649.252 6980.75 6435.07
North point of Kinki University Atomic Energy Research Instirute Station 639.566 4384.15 6435.07
Radiation dose in Onagawa (MP-2) 632.968 6385.82
Kumatori town Nishi primary school Station 631.491 5240.24 6435.07
Oshima Kawasaki Ward 630.402 4017.23 6435.07
Izumisano municipal Oike athletic field Station 629.920 5908.24 6435.07
Atom-kyoudou nursery school Station 625.566 5673.02 6435.07
South point of Kinki University Atomic Energy Research Instirute Station 625.202 5164.99 6435.07
Nakamachi Omaezaki City 623.494 6651.44 6435.07
Uraga Yokosuka City 622.492 3151.66 6435.07
Goritoge Shika Town 622.143 7065.43 6435.07
Kumatori town Minami primary school Station 606.134 6011.71 6435.07
Radiation dose at JAEA Oarai (P1) 603.643 6391.3
Yamanotedai-No.1 Park Station 599.140 5607.15 6435.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 6407.71
Noumi Shika Town 594.021 6990.12 6435.07
Radiation dose in Watari 591.851 6388.56
Hairando Yokosuka City 588.667 3951.36 6435.07
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3999.29 6421.39
Ningyotoge Kagamino Town 574.857 5607.15 6435.07
Ten-no Kagamino Town 569.960 6717.31 6435.07
Funagura Yokosuka City 563.909 3725.57 6435.07
Chidori Kawasaki Ward 560.211 3603.25 6435.07
Radiation dose at JAEA Oarai (P16) 556.365 6388.56
Shika Shika Town 551.376 6736.11 6435.07
Higashiosaka municipal Kamikosaka primary scool Station 550.277 4374.72 6435.07
Sahara Yokosuka City 547.404 3490.35 6435.07
Kazanashi Shika Town 545.377 6322.18 6435.07
Akasumi Shika Town 544.970 5785.92 6435.07
Kurahashi Maizuru City 540.820 5268.46 6435.07
Obama Obama City 540.809 4713.41 6435.07
Sakuragaike community hall Omaezaki City 540.772 6820.78 6435.07
Shirowa primary school Omaezaki City 535.692 6679.66 6435.07
Radiation dose at JAEA Oarai (P5) 529.759 6388.56
Uenohara Omaezaki City 529.333 6867.86 6435.07
Kumano Shika Town 529.019 6557.4 6435.07
Izumisano municipal Hineno filtration plant Station 527.471 5654.23 6435.07
Nishi-hamasada Matsue City 525.089 6259.15 6418.66
Kouno Minami-Echizen Town 525.028 4741.63 6435.07
Kurihama Yokosuka City 523.708 3772.59 6435.07
Osaka prefectural Kumatori off-site-center Station 522.808 5212.01 6435.07
Ogasa branch Kikugawa City 522.039 6947.1 6421.39
Izumisano municipal Hineno primary scool Station 518.181 4525.27 6435.07
Shirasuna Omaezaki City 499.479 6726.74 6435.07
Jitougata primary school Makinohara City 498.059 6453.87 6435.07
Kataku Matsue City 497.007 5014.44 6435.07
Nishihemi Yokosuka City 496.917 3010.54 6435.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 6407.71
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4939.2 6435.07
Otomi Takahama Town 494.821 5531.9 6435.07
Otsu Nanao City 493.895 5550.7 6435.07
The Observation point for comparison Tatsunokuchi 493.454 4572.29 6435.07
Hitsuhama Ohi Town 492.630 5146.19 6435.07
Kijiyama Misasa Town 489.284 5221.44 6435.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 6407.71
Hiraba Omaezaki City 485.878 6726.74 6435.07
Tayu Matsue City 484.956 5230.87 6435.07
Hamaokakita primary school Omaezaki City 484.537 6900.18 6421.39
Oitomi Ayabe City 474.670 6632.64 6435.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 6407.71
Kashiwazaki-shigai Kashiwazaki City 470.822 5277.89 6435.07
Mitsu Matsue City 466.897 5005.07 6435.07
Tonomachi Kawasaki Ward 463.967 6340.97 6435.07
Daitou branch Kakegawa City 463.829 6796.93 6421.39
Fukura Shika Town 462.493 6312.75 6435.07
Nagasawa Yokosuka City 462.365 3687.92 6435.07
The athletic field Station of Kinki University 461.661 4167.73 6435.07
Koura Matsue City 461.049 5974.06 6435.07
Sakurasan Ward Omaezaki City 459.434 6510.32 6435.07
Tsuchikawa Nanao City 458.915 6143.41 6435.07
Kumatori Town office Station 457.917 4299.48 6435.07
Shinkango Omaezaki City 449.013 7535.81 6435.07
Ogurui Takahama Town 448.279 4929.77 6435.07
Kusabue Omaezaki City 444.162 7103.02 6435.07
Omaezaki City monitoring center 443.946 6971.33 6435.07
Akawase Kagamino Town 442.246 4299.48 6435.07
Ibaraki 442.139 3157.06 6426.86
Hinode Town Yokosuka City 438.324 2483.71 6435.07
Nishiyama Kashiwazaki City 437.251 7469.93 6435.07
Kariwa Kariwa Village 436.307 5635.37 6435.07
Osaka prefectural Hineno high scool Station 435.745 5023.87 6435.07
Miyagawa Kashiwazaki City 435.245 5560.13 6435.07
Radiation dose in Natori 434.640 6388.56
Kami-koubu Matsue City 433.868 5466.03 6435.07
Shimo-Takamachi Kariwa Village 433.192 6134.03 6435.07
Osaka prefectural Sano supporting school Station 432.398 5475.46 6435.07
Arahama Kashiwazaki City 428.874 5729.47 6435.07
Doai Kashiwazaki City 425.681 5390.78 6435.07
Owashi Matsue City 424.452 5343.76 6435.07
Okayasu Maizuru City 422.568 6293.95 6435.07
Katsuyama Kariwa Village 421.280 5729.47 6435.07
Kita-koubu Matsue City 420.683 5861.17 6435.07
Kichisaka Maizuru City 413.065 7648.7 6435.07
Nagai Ohi Town 410.699 5562.45 6426.86
Shiokumi Maizuru City 407.938 9520.92 6435.07
Miyadome Ohi Town 407.831 4609.94 6435.07
Kariwa Kariwa Village 407.617 5936.47 6435.07
Ueno Satsuma-sendai City 394.248 4308.85 6435.07
Power Station-South 389.191 6275.15 6435.07
Radiation dose at JAEA Oarai (P6) 386.963 6388.56
Power Station- 385.546 6124.61 6435.07
Takae Satsuma-sendai City 379.551 4365.29 6435.07
Hokawaduura Genkai Town 378.015 6646.75 6435.07
Kou Itimatsu Suetsugu 377.929 4798.08 6435.07
Minato Satsuma-sendai City 377.656 3998.38 6435.07
Iwanai Iwanai Town 376.336 6516.97 6432.34
Hattari Kyowa Town 373.047 6338.28 6432.34
Chatsu Tomari Village 371.011 6056.16 6432.34
Oyama Maizuru City 358.223 5513.11 6435.07
Kodaira Satsuma-sendai City 355.545 4045.46 6435.07
Kayanuma Tomari Village 354.809 5388.49 6432.34
Anojiri Obama City 353.215 4515.84 6435.07
Kushi Genkai Town 349.738 9172.8 6435.07
Yamaguchi 348.715 7216.13 6426.86
Sadahongou Matsue City 348.228 5616.58 6435.07
Sakibe Karatsu City 347.801 8692.99 6435.07
Hirao Genkai Town 343.814 9163.37 6435.07
The Meteorological Obsevatory of kyowa Town 343.275 6009.16 6432.34
Minami-Horoni Kyowa Town 335.180 5632.98 6432.34
Kounoura Takahama Town 330.353 4760.43 6435.07
Kyoudomarisaki Karatsu City 328.622 9313.92 6435.07
Horikappu Jinja Tomari Village 328.230 5830.46 6432.34
Hukada-kita Matsue City 327.031 4619.31 6435.07
Radiation dose in KEK, Tsukuba 326.240 6407.71
Herokaruusu Tomari Village 324.242 6046.79 6432.34
Yorita Satsuma-sendai City 323.218 4732.21 6435.07
Kamoenai Kamoenai Village 322.032 5106.37 6432.34
Radiation dose in Onagawa (MP-6) 316.267 6385.82
Imamura Genkai Town 314.749 78932.9 6435.07
Yamanaka Takahama Town 314.185 6143.41 6435.07
Sendai (Miyagi) 312.585 2892.09 6426.86
Radiation dose in Onagawa (MP-1) 300.147 6385.82
Gumisaki Satsuma-sendai City 295.693 3819.67 6435.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 6407.71
Aomori Aomori City 285.372 3883.83 6432.34
Misawa City hall Misawa City 283.728 7532.6 6432.34
Kashu Ikata Town 277.173 3941.93 6435.07
Noheji Town Office Noheji Town 272.004 3329.02 6432.34
Takasimamati 271.103 4195.95 6435.07
Radiation dose in Onagawa (MP-3) 270.563 6385.82
Kucho Ikata Town 269.545 3480.98 6435.07
Radiation dose in Marumori 269.436 6388.56
Kawanagata Ikata Town 266.821 3396.31 6435.07
Tochigi 260.733 3777.19 6426.86
Chikagawa Mutu City 256.719 4335.23 6432.34
Yokohama Town Office Yokohama Town 254.846 5313.28 6432.34
Tokyo 251.877 4453.7 6426.86
Hiranuma Rokkasho Village 251.186 3488.87 6432.34
Taisei Ikata Town 246.293 2549.59 6435.07
Chitose-daira Rokkasho Village 245.868 3761.62 6432.34
Gifu 243.951 6201.36 6426.86
Fukkoshi Yokohama Town 243.102 3648.77 6432.34
Shimane 240.651 6201.36 6426.86
Sunagomata Higashidoori Village 238.012 5275.64 6432.34
Obuchi Rokkasho Village 237.506 4194.17 6432.34
Tomari Rokkasho Village 230.636 5868.1 6432.34
kanagawa 226.339 3889.94 6426.86
Saitama 219.770 3382.56 6426.86
Ikatagoshi Ikata Town 217.515 3208.11 6435.07
Touhoku Branch office Touhoku Town 215.416 3037.47 6432.34
Radiation dose at Tohoku University 214.824 6388.56
Odanosawa Higashidoori Village 210.287 4203.59 6432.34
Kagawa 205.829 4340.95 6426.86
Oippe Higashidoori Village 205.182 3620.56 6432.34
Oita 200.921 4791.96 6426.86
Touhoku Town office Touhoku Town 200.811 14049.6 6432.34
Kuchogoshi Ikata Town 198.646 3255.19 6435.07
Minatoura Ikata Town 186.776 2925.87 6435.07
Radiation dose in Koyadori, Ojika 184.905 6383.09
Toyama 184.580 8287.27 6426.86
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3999.29 6421.39
Radiation dose in Tukahama, Ojika 183.417 6383.09
Chiba 182.407 2480.54 6426.86
Nara 182.387 4510.08 6426.86
Okayama 181.976 5863.1 6426.86
Yamagata 181.598 4622.83 6426.86
Ehime 180.745 4171.82 6426.86
Ishikawa 180.445 7187.94 6426.86
Niigata 177.483 8625.53 6426.86
Hiroshima 176.816 3889.94 6426.86
Mie 174.867 4448.07 6426.86
Fukui 170.045 5468.47 6426.86
Radiation dose in Terama, Ojika 168.036 6383.09
Yamanashi 164.561 3608.06 6426.86
Nagano 162.242 5491.02 6426.86
Saga 161.421 4848.34 6426.86
Tottori 161.392 4453.7 6426.86
Radiation dose in Enoshima, Ojika 160.091 6383.09
Osaka 159.103 3438.94 6426.86
Ibaraki-city Environment 157.249 6342.05
Aichi 149.345 4171.82 6426.86
Toyonoura Ikata Town 149.214 3358.66 6435.07
Shizuoka 148.639 4312.76 6426.86
Kyoto 144.522 4904.71 6426.86
Kagoshima 144.449 5316.26 6426.86
Tokushima 143.627 3777.19 6426.86
Gunma 143.572 2536.92 6426.86
Hyogo 139.710 4284.58 6426.86
Fukuoka 136.511 4453.7 6426.86
Wakayama 133.857 3157.06 6426.86
Radiation at Tamaki-cho Mie Japan 133.138 6342.05
Akita 132.832 4848.34 6426.86
Shiga 124.919 3438.94 6426.86
Nagasaki 109.459 3889.94 6426.86
Hokkaido 109.189 5919.48 6426.86
Kumamoto 103.568 3777.19 6426.86
Aomori 101.819 5750.35 6426.86
Miyazaki 100.354 3743.37 6426.86
Kochi 95.931 4284.58 6426.86
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3990.77 6407.71
Iwate 90.324 4735.58 6426.86
Environment Feeds from Ohta 83.623 6342.05
Okinawa 82.305 3241.62 6426.86
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