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Accumulated absorbed dose rate - T=13.03.2011 - 24.05.2017(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 6109.49
Fukushima I MP8 570942.000 6109.49
Fukushima I MP6 240668.000 6109.49
Yamada Futaba Town 176983.000 4755.03 5666.26
Fukushima I MP2 140420.000 6109.49
Fukushima I MP5 111325.000 6109.49
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3849.34 6180.62
Fukushima I MP3 93730.602 6109.49
Fukushima I MP4 86821.500 6109.49
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3849.34 6180.62
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3798.22 6098.54
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3849.34 6180.62
Ono Okuma Town 38610.500 4390.5 5666.26
Shinzan Futaba Town 38332.801 3984.62 5666.26
Fukushima I MP1 31496.801 6109.49
Yonomori Tomioka Town 29815.900 4539.62 5666.26
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3849.34 6180.62
Tomioka Tomioka Town 25324.500 4887.54 5666.26
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3849.34 6180.62
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3849.34 6180.62
Shimo-Kooriyama Tomioka Town 13057.000 4854.44 5666.26
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3849.34 6180.62
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3849.34 6180.62
Kami-kooriyama Tomioka Town 11803.900 3810.66 5666.26
Fukushima II MP3 11060.600 6109.49
Fukushima II MP1 10903.000 6109.49
Kooriyama Futaba Town 10352.900 4440.21 5666.26
Fukushima II MP4 9696.330 6109.49
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3845.93 6175.15
Fukushima II MP5 9382.150 6109.49
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3849.34 6180.62
Matsudate Naraha Town 8410.890 5185.77 5666.26
Shigeoka Naraha Town 8115.970 5732.51 5666.26
Fukushima II MP2 7875.320 6109.49
Namie Namie Town 7321.210 4183.44 5666.26
Radiation dose at Shirasawa branch office, Motomiya 7287.920 6125.9
Fukushima II MP6 7062.690 6109.49
Fukushima II MP7 6511.580 6106.75
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3849.34 6180.62
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3849.34 6180.62
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3849.34 6180.62
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3849.34 6180.62
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3849.34 6180.62
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3849.34 6180.62
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3844.22 6172.42
Futatsunuma Hirono Town 3520.340 4970.4 5666.26
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3849.34 6180.62
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3849.34 6180.62
Radiation dose at Koriyama joint government building, Koriyama 3232.890 6123.17
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3849.34 6180.62
Kiyohashi Namie Town 3162.000 3669.8 5666.26
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3844.22 6172.42
Radiation dose at Agricultural center, Koriyama 3128.960 6123.17
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3849.34 6180.62
Radiation dose at Koriyama city office, Koriyama 2803.520 6123.17
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3849.34 6180.62
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3844.22 6172.42
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3849.34 6180.62
Yamadaoka Naraha Town 2205.340 4407.1 5666.26
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 6125.9
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3849.34 6180.62
Kuji Hitachi City 1990.890 9558.91 6191.57
Hitachinaka Hitachinaka City 1951.950 4198.25 6188.83
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3844.22 6172.42
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3844.22 6172.42
Momiyama Hokota City 1837.540 4788.53 6191.57
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3844.22 6172.42
Horiguchi Hitachinaka City 1779.410 4183.87 6194.3
Onuma Hitachi City 1776.950 3564.93 6188.83
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3849.34 6180.62
Tsukuriya Hokota City 1736.890 4028.16 6191.57
Radiation dose at Big palette Fukushima, Koriyama 1668.540 6123.17
Nemoto Hitachioomiya City 1633.190 4487.83 6188.83
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3849.34 6180.62
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3849.34 6180.62
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 6131.38
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3849.34 6180.62
Radiation dose at JAEA Oarai (P12) 1512.140 6147.79
Radiation dose at Ose administration center, Koriyama 1494.270 6123.17
Araji Hokota City 1437.760 4037.17 6191.57
Ishigami Tokai Village 1431.690 3675.13 6191.57
Mawatari Hitachinaka City 1422.870 4245.41 6191.57
Radiation dose at JAEA Oarai (P11) 1399.370 6147.79
Onuki Oarai Town 1387.990 4408.34 6191.57
Sawa Hitachinaka City 1353.770 3329.65 6188.83
Toyooka Tokai Village 1321.760 4046.24 6191.57
Ajigaura Hitachinaka City 1313.890 3981.1 6188.83
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3849.34 6180.62
Geiger Counter Feeds from Asao Kawasaki 1266.620 6101.28
Radiation dose at Tamokami elementary school, Koriyama 1256.140 6123.17
Isohama Oarai Town 1250.540 3843.68 6186.1
Ebisawa Ibaraki Town 1222.240 10434.2 6188.83
Muramatsu Tokai Village 1203.520 4082.47 6191.57
Kamitoda Hokota City 1184.740 3349.26 6191.57
Yanagisawa Hitachinaka City 1166.970 3411.08 6188.83
Tokushuku Hokota City 1159.730 3023.39 6191.57
Tasaki Hokota City 1153.300 3576.19 6161.47
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3849.34 6180.62
Kadobe Naka City 1086.580 8125.12 6188.83
Radiation dose at Date city office, Date 1076.050 6125.9
Oshinobe Tokai Village 1041.340 3810.91 6191.57
Oba Mito City 1037.670 12518.9 6191.57
Godai Naka City 1031.270 3303.96 6191.57
Ishikawa Mito City 1030.810 3894.1 6194.3
Isobe Hitachiota City 1013.130 18792 6191.57
Yatabe Ibaraki Town 996.127 3267.79 6191.57
Radiation dose at Motomiya city office, Motomiya 992.703 6125.9
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3844.22 6172.42
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3844.22 6172.42
Yokobori Naka City 930.280 3829 6191.57
Sugaya Naka City 926.186 5850.19 6194.3
Kounosu Naka City 926.087 2987.16 6191.57
Funaishikawa Tokai Village 900.399 3964.78 6191.57
Nukada Naka City 899.900 3581.42 6186.1
Uridura Naka City 890.113 3418.63 6186.1
Shiraki Tsuruga City 881.330 7253.86 6194.3
Motokomezaki Naka City 880.851 3187.42 6158.74
Shiraki pass Tsuruga City 850.284 7597.97 6194.3
Radiation dose in Yamamoto 846.633 6147.79
Yoshizawa Mito City 837.646 3457.88 6191.57
Radiation dose at JAEA Oarai (P7) 831.135 6147.79
Mayumi Hitachiota City 828.119 3430.73 6191.57
Urasoko Tsuruga City 826.465 6022.22 6194.3
Nemoto Hitachioomiya City 825.588 3863.51 6188.83
Takenami Mihama Town 804.283 6321.07 6194.3
Radiation dose at JAEA Oarai (P15) 780.207 6147.79
Tateishi Tsuruga City 780.092 5007.99 6194.3
Radiation dose at JAEA Oarai (P14) 770.174 6147.79
Radiation dose at JAEA Oarai (P13) 769.612 6147.79
Ukishima Kawasaki Ward 735.475 11818.1 6194.3
Kume Hitachiota City 713.958 3358.27 6191.57
Radiation dose at JAEA Oarai (P2) 712.011 6147.79
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3844.22 6172.42
Nyuu Mihama Town 674.787 5759.62 6194.3
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3849.34 6180.62
Radiation dose in Iwanuma 670.242 6147.79
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3849.34 6180.62
Tsuruga Tsuruga City 655.360 5080.42 6194.3
Shiohama Kawasaki Ward 653.536 4057.11 6194.3
Radiation dose in Kakuda 649.863 6147.79
Sakajiri Mihama Town 649.252 6719.57 6194.3
North point of Kinki University Atomic Energy Research Instirute Station 639.566 4220.11 6194.3
Radiation dose in Onagawa (MP-2) 632.968 6145.06
Kumatori town Nishi primary school Station 631.491 5044.17 6194.3
Oshima Kawasaki Ward 630.402 3866.93 6194.3
Izumisano municipal Oike athletic field Station 629.920 5687.19 6194.3
Atom-kyoudou nursery school Station 625.566 5460.77 6194.3
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4971.74 6194.3
Nakamachi Omaezaki City 623.494 6402.57 6194.3
Uraga Yokosuka City 622.492 3033.74 6194.3
Goritoge Shika Town 622.143 6801.07 6194.3
Kumatori town Minami primary school Station 606.134 5786.78 6194.3
Radiation dose at JAEA Oarai (P1) 603.643 6150.53
Yamanotedai-No.1 Park Station 599.140 5397.36 6194.3
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 6166.94
Noumi Shika Town 594.021 6728.59 6194.3
Radiation dose in Watari 591.851 6147.79
Hairando Yokosuka City 588.667 3803.52 6194.3
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3849.34 6180.62
Ningyotoge Kagamino Town 574.857 5397.36 6194.3
Ten-no Kagamino Town 569.960 6465.98 6194.3
Funagura Yokosuka City 563.909 3586.18 6194.3
Chidori Kawasaki Ward 560.211 3468.43 6194.3
Radiation dose at JAEA Oarai (P16) 556.365 6147.79
Shika Shika Town 551.376 6484.08 6194.3
Higashiosaka municipal Kamikosaka primary scool Station 550.277 4211.04 6194.3
Sahara Yokosuka City 547.404 3359.76 6194.3
Kazanashi Shika Town 545.377 6085.63 6194.3
Akasumi Shika Town 544.970 5569.44 6194.3
Kurahashi Maizuru City 540.820 5071.34 6194.3
Obama Obama City 540.809 4537.06 6194.3
Sakuragaike community hall Omaezaki City 540.772 6565.58 6194.3
Shirowa primary school Omaezaki City 535.692 6429.74 6194.3
Radiation dose at JAEA Oarai (P5) 529.759 6147.79
Uenohara Omaezaki City 529.333 6610.9 6194.3
Kumano Shika Town 529.019 6312.05 6194.3
Izumisano municipal Hineno filtration plant Station 527.471 5442.67 6194.3
Nishi-hamasada Matsue City 525.089 6024.36 6177.89
Kouno Minami-Echizen Town 525.028 4564.22 6194.3
Kurihama Yokosuka City 523.708 3631.44 6194.3
Osaka prefectural Kumatori off-site-center Station 522.808 5017.01 6194.3
Ogasa branch Kikugawa City 522.039 6686.62 6180.62
Izumisano municipal Hineno primary scool Station 518.181 4355.95 6194.3
Shirasuna Omaezaki City 499.479 6475.06 6194.3
Jitougata primary school Makinohara City 498.059 6212.4 6194.3
Kataku Matsue City 497.007 4826.83 6194.3
Nishihemi Yokosuka City 496.917 2897.9 6194.3
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 6166.94
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4754.4 6194.3
Otomi Takahama Town 494.821 5324.93 6194.3
Otsu Nanao City 493.895 5343.02 6194.3
The Observation point for comparison Tatsunokuchi 493.454 4401.22 6194.3
Hitsuhama Ohi Town 492.630 4953.65 6194.3
Kijiyama Misasa Town 489.284 5026.08 6194.3
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 6166.94
Hiraba Omaezaki City 485.878 6475.06 6194.3
Tayu Matsue City 484.956 5035.15 6194.3
Hamaokakita primary school Omaezaki City 484.537 6641.46 6180.62
Oitomi Ayabe City 474.670 6384.48 6194.3
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 6166.94
Kashiwazaki-shigai Kashiwazaki City 470.822 5080.42 6194.3
Mitsu Matsue City 466.897 4817.81 6194.3
Tonomachi Kawasaki Ward 463.967 6103.73 6194.3
Daitou branch Kakegawa City 463.829 6542.08 6180.62
Fukura Shika Town 462.493 6076.56 6194.3
Nagasawa Yokosuka City 462.365 3549.93 6194.3
The athletic field Station of Kinki University 461.661 4011.79 6194.3
Koura Matsue City 461.049 5750.54 6194.3
Sakurasan Ward Omaezaki City 459.434 6266.73 6194.3
Tsuchikawa Nanao City 458.915 5913.55 6194.3
Kumatori Town office Station 457.917 4138.61 6194.3
Shinkango Omaezaki City 449.013 7253.86 6194.3
Ogurui Takahama Town 448.279 4745.33 6194.3
Kusabue Omaezaki City 444.162 6837.26 6194.3
Omaezaki City monitoring center 443.946 6710.5 6194.3
Akawase Kagamino Town 442.246 4138.61 6194.3
Ibaraki 442.139 3038.78 6186.1
Hinode Town Yokosuka City 438.324 2390.78 6194.3
Nishiyama Kashiwazaki City 437.251 7190.45 6194.3
Kariwa Kariwa Village 436.307 5424.53 6194.3
Osaka prefectural Hineno high scool Station 435.745 4835.9 6194.3
Miyagawa Kashiwazaki City 435.245 5352.1 6194.3
Radiation dose in Natori 434.640 6147.79
Kami-koubu Matsue City 433.868 5261.52 6194.3
Shimo-Takamachi Kariwa Village 433.192 5904.53 6194.3
Osaka prefectural Sano supporting school Station 432.398 5270.59 6194.3
Arahama Kashiwazaki City 428.874 5515.1 6194.3
Doai Kashiwazaki City 425.681 5189.09 6194.3
Owashi Matsue City 424.452 5143.83 6194.3
Okayasu Maizuru City 422.568 6058.46 6194.3
Katsuyama Kariwa Village 421.280 5515.1 6194.3
Kita-koubu Matsue City 420.683 5641.87 6194.3
Kichisaka Maizuru City 413.065 7362.53 6194.3
Nagai Ohi Town 410.699 5354.07 6186.1
Shiokumi Maizuru City 407.938 9164.69 6194.3
Miyadome Ohi Town 407.831 4437.46 6194.3
Kariwa Kariwa Village 407.617 5714.35 6194.3
Ueno Satsuma-sendai City 394.248 4147.63 6194.3
Power Station-South 389.191 6040.37 6194.3
Radiation dose at JAEA Oarai (P6) 386.963 6147.79
Power Station- 385.546 5895.46 6194.3
Takae Satsuma-sendai City 379.551 4201.97 6194.3
Hokawaduura Genkai Town 378.015 6398.06 6194.3
Kou Itimatsu Suetsugu 377.929 4618.56 6194.3
Minato Satsuma-sendai City 377.656 3848.78 6194.3
Iwanai Iwanai Town 376.336 6273.04 6191.57
Hattari Kyowa Town 373.047 6101.03 6191.57
Chatsu Tomari Village 371.011 5829.47 6191.57
Oyama Maizuru City 358.223 5306.83 6194.3
Kodaira Satsuma-sendai City 355.545 3894.1 6194.3
Kayanuma Tomari Village 354.809 5186.8 6191.57
Anojiri Obama City 353.215 4346.88 6194.3
Kushi Genkai Town 349.738 8829.6 6194.3
Yamaguchi 348.715 6945.79 6186.1
Sadahongou Matsue City 348.228 5406.43 6194.3
Sakibe Karatsu City 347.801 8367.74 6194.3
Hirao Genkai Town 343.814 8820.53 6194.3
The Meteorological Obsevatory of kyowa Town 343.275 5784.23 6191.57
Minami-Horoni Kyowa Town 335.180 5422.13 6191.57
Kounoura Takahama Town 330.353 4582.32 6194.3
Kyoudomarisaki Karatsu City 328.622 8965.44 6194.3
Horikappu Jinja Tomari Village 328.230 5612.22 6191.57
Hukada-kita Matsue City 327.031 4446.48 6194.3
Radiation dose in KEK, Tsukuba 326.240 6166.94
Herokaruusu Tomari Village 324.242 5820.45 6191.57
Yorita Satsuma-sendai City 323.218 4555.15 6194.3
Kamoenai Kamoenai Village 322.032 4915.24 6191.57
Radiation dose in Onagawa (MP-6) 316.267 6145.06
Imamura Genkai Town 314.749 75979.7 6194.3
Yamanaka Takahama Town 314.185 5913.55 6194.3
Sendai (Miyagi) 312.585 2783.74 6186.1
Radiation dose in Onagawa (MP-1) 300.147 6145.06
Gumisaki Satsuma-sendai City 295.693 3676.75 6194.3
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 6166.94
Aomori Aomori City 285.372 3738.46 6191.57
Misawa City hall Misawa City 283.728 7250.65 6191.57
Kashu Ikata Town 277.173 3794.45 6194.3
Noheji Town Office Noheji Town 272.004 3204.41 6191.57
Takasimamati 271.103 4038.96 6194.3
Radiation dose in Onagawa (MP-3) 270.563 6145.06
Kucho Ikata Town 269.545 3350.74 6194.3
Radiation dose in Marumori 269.436 6147.79
Kawanagata Ikata Town 266.821 3269.23 6194.3
Tochigi 260.733 3635.69 6186.1
Chikagawa Mutu City 256.719 4172.95 6191.57
Yokohama Town Office Yokohama Town 254.846 5114.4 6191.57
Tokyo 251.877 4286.86 6186.1
Hiranuma Rokkasho Village 251.186 3358.27 6191.57
Taisei Ikata Town 246.293 2454.19 6194.3
Chitose-daira Rokkasho Village 245.868 3620.82 6191.57
Gifu 243.951 5969.04 6186.1
Fukkoshi Yokohama Town 243.102 3512.19 6191.57
Shimane 240.651 5969.04 6186.1
Sunagomata Higashidoori Village 238.012 5078.17 6191.57
Obuchi Rokkasho Village 237.506 4037.17 6191.57
Tomari Rokkasho Village 230.636 5648.45 6191.57
kanagawa 226.339 3744.22 6186.1
Saitama 219.770 3255.84 6186.1
Ikatagoshi Ikata Town 217.515 3088.08 6194.3
Touhoku Branch office Touhoku Town 215.416 2923.78 6191.57
Radiation dose at Tohoku University 214.824 6147.79
Odanosawa Higashidoori Village 210.287 4046.24 6191.57
Kagawa 205.829 4178.33 6186.1
Oippe Higashidoori Village 205.182 3485.04 6191.57
Oita 200.921 4612.44 6186.1
Touhoku Town office Touhoku Town 200.811 13523.7 6191.57
Kuchogoshi Ikata Town 198.646 3133.39 6194.3
Minatoura Ikata Town 186.776 2816.4 6194.3
Radiation dose in Koyadori, Ojika 184.905 6142.32
Toyama 184.580 7976.81 6186.1
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3849.34 6180.62
Radiation dose in Tukahama, Ojika 183.417 6142.32
Chiba 182.407 2387.62 6186.1
Nara 182.387 4341.12 6186.1
Okayama 181.976 5643.46 6186.1
Yamagata 181.598 4449.65 6186.1
Ehime 180.745 4015.54 6186.1
Ishikawa 180.445 6918.66 6186.1
Niigata 177.483 8302.39 6186.1
Hiroshima 176.816 3744.22 6186.1
Mie 174.867 4281.43 6186.1
Fukui 170.045 5263.61 6186.1
Radiation dose in Terama, Ojika 168.036 6142.32
Yamanashi 164.561 3472.9 6186.1
Nagano 162.242 5285.31 6186.1
Saga 161.421 4666.7 6186.1
Tottori 161.392 4286.86 6186.1
Radiation dose in Enoshima, Ojika 160.091 6142.32
Osaka 159.103 3310.1 6186.1
Ibaraki-city Environment 157.249 6101.28
Aichi 149.345 4015.54 6186.1
Toyonoura Ikata Town 149.214 3232.99 6194.3
Shizuoka 148.639 4151.2 6186.1
Kyoto 144.522 4720.97 6186.1
Kagoshima 144.449 5117.1 6186.1
Tokushima 143.627 3635.69 6186.1
Gunma 143.572 2441.88 6186.1
Hyogo 139.710 4124.06 6186.1
Fukuoka 136.511 4286.86 6186.1
Wakayama 133.857 3038.78 6186.1
Radiation at Tamaki-cho Mie Japan 133.138 6101.28
Akita 132.832 4666.7 6186.1
Shiga 124.919 3310.1 6186.1
Nagasaki 109.459 3744.22 6186.1
Hokkaido 109.189 5697.72 6186.1
Kumamoto 103.568 3635.69 6186.1
Aomori 101.819 5534.93 6186.1
Miyazaki 100.354 3603.13 6186.1
Kochi 95.931 4124.06 6186.1
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3840.82 6166.94
Iwate 90.324 4558.18 6186.1
Environment Feeds from Ohta 83.623 6101.28
Okinawa 82.305 3120.18 6186.1
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