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Accumulated absorbed dose rate - T=13.03.2011 - 09.02.2016(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 4823.57
Fukushima I MP8 570942.000 4823.57
Fukushima I MP6 240668.000 4823.57
Yamada Futaba Town 176983.000 3675.91 4380.34
Fukushima I MP2 140420.000 4823.57
Fukushima I MP5 111325.000 4823.57
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3048.46 4894.7
Fukushima I MP3 93730.602 4823.57
Fukushima I MP4 86821.500 4823.57
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3048.46 4894.7
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2997.34 4812.62
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3048.46 4894.7
Ono Okuma Town 38610.500 3394.11 4380.34
Shinzan Futaba Town 38332.801 3080.34 4380.34
Fukushima I MP1 31496.801 4823.57
Yonomori Tomioka Town 29815.900 3509.38 4380.34
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3048.46 4894.7
Tomioka Tomioka Town 25324.500 3778.35 4380.34
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3048.46 4894.7
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3048.46 4894.7
Shimo-Kooriyama Tomioka Town 13057.000 3752.76 4380.34
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3048.46 4894.7
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3048.46 4894.7
Kami-kooriyama Tomioka Town 11803.900 2945.85 4380.34
Fukushima II MP3 11060.600 4823.57
Fukushima II MP1 10903.000 4823.57
Kooriyama Futaba Town 10352.900 3432.53 4380.34
Fukushima II MP4 9696.330 4823.57
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3045.05 4889.23
Fukushima II MP5 9382.150 4823.57
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3048.46 4894.7
Matsudate Naraha Town 8410.890 4008.89 4380.34
Shigeoka Naraha Town 8115.970 4431.56 4380.34
Fukushima II MP2 7875.320 4823.57
Namie Namie Town 7321.210 3234.03 4380.34
Radiation dose at Shirasawa branch office, Motomiya 7287.920 4839.98
Fukushima II MP6 7062.690 4823.57
Fukushima II MP7 6511.580 4820.83
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3048.46 4894.7
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3048.46 4894.7
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3048.46 4894.7
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3048.46 4894.7
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3048.46 4894.7
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3048.46 4894.7
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3043.34 4886.5
Futatsunuma Hirono Town 3520.340 3842.4 4380.34
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3048.46 4894.7
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3048.46 4894.7
Radiation dose at Koriyama joint government building, Koriyama 3232.890 4837.25
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3048.46 4894.7
Kiyohashi Namie Town 3162.000 2836.96 4380.34
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3043.34 4886.5
Radiation dose at Agricultural center, Koriyama 3128.960 4837.25
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3048.46 4894.7
Radiation dose at Koriyama city office, Koriyama 2803.520 4837.25
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3048.46 4894.7
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3043.34 4886.5
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3048.46 4894.7
Yamadaoka Naraha Town 2205.340 3406.94 4380.34
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 4839.98
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3048.46 4894.7
Kuji Hitachi City 1990.890 7573.63 4905.65
Hitachinaka Hitachinaka City 1951.950 3325.94 4902.91
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3043.34 4886.5
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3043.34 4886.5
Momiyama Hokota City 1837.540 3794 4905.65
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3043.34 4886.5
Horiguchi Hitachinaka City 1779.410 3315.31 4908.38
Onuma Hitachi City 1776.950 2824.21 4902.91
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3048.46 4894.7
Tsukuriya Hokota City 1736.890 3191.55 4905.65
Radiation dose at Big palette Fukushima, Koriyama 1668.540 4837.25
Nemoto Hitachioomiya City 1633.190 3555.34 4902.91
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3048.46 4894.7
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3048.46 4894.7
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 4845.46
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3048.46 4894.7
Radiation dose at JAEA Oarai (P12) 1512.140 4861.87
Radiation dose at Ose administration center, Koriyama 1494.270 4837.25
Araji Hokota City 1437.760 3198.7 4905.65
Ishigami Tokai Village 1431.690 2911.85 4905.65
Mawatari Hitachinaka City 1422.870 3363.68 4905.65
Radiation dose at JAEA Oarai (P11) 1399.370 4861.87
Onuki Oarai Town 1387.990 3492.78 4905.65
Sawa Hitachinaka City 1353.770 2637.81 4902.91
Toyooka Tokai Village 1321.760 3205.88 4905.65
Ajigaura Hitachinaka City 1313.890 3153.91 4902.91
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3048.46 4894.7
Geiger Counter Feeds from Asao Kawasaki 1266.620 4815.36
Radiation dose at Tamokami elementary school, Koriyama 1256.140 4837.25
Isohama Oarai Town 1250.540 3044.69 4900.18
Ebisawa Ibaraki Town 1222.240 8266.14 4902.91
Muramatsu Tokai Village 1203.520 3234.59 4905.65
Kamitoda Hokota City 1184.740 2653.65 4905.65
Yanagisawa Hitachinaka City 1166.970 2702.32 4902.91
Tokushuku Hokota City 1159.730 2395.46 4905.65
Tasaki Hokota City 1153.300 2829.83 4875.55
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3048.46 4894.7
Kadobe Naka City 1086.580 6436.88 4902.91
Radiation dose at Date city office, Date 1076.050 4839.98
Oshinobe Tokai Village 1041.340 3019.43 4905.65
Oba Mito City 1037.670 9918.88 4905.65
Godai Naka City 1031.270 2617.77 4905.65
Ishikawa Mito City 1030.810 3085.69 4908.38
Isobe Hitachiota City 1013.130 14889.1 4905.65
Yatabe Ibaraki Town 996.127 2589.11 4905.65
Radiation dose at Motomiya city office, Motomiya 992.703 4839.98
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3043.34 4886.5
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3043.34 4886.5
Yokobori Naka City 930.280 3033.76 4905.65
Sugaya Naka City 926.186 4635.71 4908.38
Kounosu Naka City 926.087 2366.76 4905.65
Funaishikawa Tokai Village 900.399 3141.34 4905.65
Nukada Naka City 899.900 2836.94 4900.18
Uridura Naka City 890.113 2707.99 4900.18
Shiraki Tsuruga City 881.330 5747.98 4908.38
Motokomezaki Naka City 880.851 2521.9 4872.82
Shiraki pass Tsuruga City 850.284 6020.65 4908.38
Radiation dose in Yamamoto 846.633 4861.87
Yoshizawa Mito City 837.646 2739.72 4905.65
Radiation dose at JAEA Oarai (P7) 831.135 4861.87
Mayumi Hitachiota City 828.119 2718.2 4905.65
Urasoko Tsuruga City 826.465 4772.03 4908.38
Nemoto Hitachioomiya City 825.588 3060.75 4902.91
Takenami Mihama Town 804.283 5008.83 4908.38
Radiation dose at JAEA Oarai (P15) 780.207 4861.87
Tateishi Tsuruga City 780.092 3968.34 4908.38
Radiation dose at JAEA Oarai (P14) 770.174 4861.87
Radiation dose at JAEA Oarai (P13) 769.612 4861.87
Ukishima Kawasaki Ward 735.475 9364.68 4908.38
Kume Hitachiota City 713.958 2660.8 4905.65
Radiation dose at JAEA Oarai (P2) 712.011 4861.87
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3043.34 4886.5
Nyuu Mihama Town 674.787 4563.94 4908.38
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3048.46 4894.7
Radiation dose in Iwanuma 670.242 4861.87
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3048.46 4894.7
Tsuruga Tsuruga City 655.360 4025.74 4908.38
Shiohama Kawasaki Ward 653.536 3214.86 4908.38
Radiation dose in Kakuda 649.863 4861.87
Sakajiri Mihama Town 649.252 5324.61 4908.38
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3344.03 4908.38
Radiation dose in Onagawa (MP-2) 632.968 4859.14
Kumatori town Nishi primary school Station 631.491 3997.02 4908.38
Oshima Kawasaki Ward 630.402 3064.17 4908.38
Izumisano municipal Oike athletic field Station 629.920 4506.54 4908.38
Atom-kyoudou nursery school Station 625.566 4327.13 4908.38
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3939.62 4908.38
Nakamachi Omaezaki City 623.494 5073.42 4908.38
Uraga Yokosuka City 622.492 2403.95 4908.38
Goritoge Shika Town 622.143 5389.19 4908.38
Kumatori town Minami primary school Station 606.134 4585.46 4908.38
Radiation dose at JAEA Oarai (P1) 603.643 4864.61
Yamanotedai-No.1 Park Station 599.140 4276.88 4908.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4881.02
Noumi Shika Town 594.021 5331.75 4908.38
Radiation dose in Watari 591.851 4861.87
Hairando Yokosuka City 588.667 3013.92 4908.38
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3048.46 4894.7
Ningyotoge Kagamino Town 574.857 4276.88 4908.38
Ten-no Kagamino Town 569.960 5123.66 4908.38
Funagura Yokosuka City 563.909 2841.7 4908.38
Chidori Kawasaki Ward 560.211 2748.39 4908.38
Radiation dose at JAEA Oarai (P16) 556.365 4861.87
Shika Shika Town 551.376 5138 4908.38
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3336.84 4908.38
Sahara Yokosuka City 547.404 2662.28 4908.38
Kazanashi Shika Town 545.377 4822.27 4908.38
Akasumi Shika Town 544.970 4413.24 4908.38
Kurahashi Maizuru City 540.820 4018.55 4908.38
Obama Obama City 540.809 3595.18 4908.38
Sakuragaike community hall Omaezaki City 540.772 5202.59 4908.38
Shirowa primary school Omaezaki City 535.692 5094.95 4908.38
Radiation dose at JAEA Oarai (P5) 529.759 4861.87
Uenohara Omaezaki City 529.333 5238.49 4908.38
Kumano Shika Town 529.019 5001.69 4908.38
Izumisano municipal Hineno filtration plant Station 527.471 4312.79 4908.38
Nishi-hamasada Matsue City 525.089 4770.4 4891.97
Kouno Minami-Echizen Town 525.028 3616.7 4908.38
Kurihama Yokosuka City 523.708 2877.56 4908.38
Osaka prefectural Kumatori off-site-center Station 522.808 3975.49 4908.38
Ogasa branch Kikugawa City 522.039 5295.43 4894.7
Izumisano municipal Hineno primary scool Station 518.181 3451.67 4908.38
Shirasuna Omaezaki City 499.479 5130.85 4908.38
Jitougata primary school Makinohara City 498.059 4922.72 4908.38
Kataku Matsue City 497.007 3824.79 4908.38
Nishihemi Yokosuka City 496.917 2296.31 4908.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4881.02
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3767.4 4908.38
Otomi Takahama Town 494.821 4219.49 4908.38
Otsu Nanao City 493.895 4233.83 4908.38
The Observation point for comparison Tatsunokuchi 493.454 3487.54 4908.38
Hitsuhama Ohi Town 492.630 3925.29 4908.38
Kijiyama Misasa Town 489.284 3982.68 4908.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4881.02
Hiraba Omaezaki City 485.878 5130.85 4908.38
Tayu Matsue City 484.956 3989.87 4908.38
Hamaokakita primary school Omaezaki City 484.537 5259.66 4894.7
Oitomi Ayabe City 474.670 5059.08 4908.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4881.02
Kashiwazaki-shigai Kashiwazaki City 470.822 4025.74 4908.38
Mitsu Matsue City 466.897 3817.65 4908.38
Tonomachi Kawasaki Ward 463.967 4836.61 4908.38
Daitou branch Kakegawa City 463.829 5180.96 4894.7
Fukura Shika Town 462.493 4815.08 4908.38
Nagasawa Yokosuka City 462.365 2812.98 4908.38
The athletic field Station of Kinki University 461.661 3178.95 4908.38
Koura Matsue City 461.049 4556.75 4908.38
Sakurasan Ward Omaezaki City 459.434 4965.78 4908.38
Tsuchikawa Nanao City 458.915 4685.91 4908.38
Kumatori Town office Station 457.917 3279.45 4908.38
Shinkango Omaezaki City 449.013 5747.98 4908.38
Ogurui Takahama Town 448.279 3760.21 4908.38
Kusabue Omaezaki City 444.162 5417.87 4908.38
Omaezaki City monitoring center 443.946 5317.42 4908.38
Akawase Kagamino Town 442.246 3279.45 4908.38
Ibaraki 442.139 2407.1 4900.18
Hinode Town Yokosuka City 438.324 1894.46 4908.38
Nishiyama Kashiwazaki City 437.251 5697.73 4908.38
Kariwa Kariwa Village 436.307 4298.41 4908.38
Osaka prefectural Hineno high scool Station 435.745 3831.98 4908.38
Miyagawa Kashiwazaki City 435.245 4241.02 4908.38
Radiation dose in Natori 434.640 4861.87
Kami-koubu Matsue City 433.868 4169.24 4908.38
Shimo-Takamachi Kariwa Village 433.192 4678.77 4908.38
Osaka prefectural Sano supporting school Station 432.398 4176.43 4908.38
Arahama Kashiwazaki City 428.874 4370.18 4908.38
Doai Kashiwazaki City 425.681 4111.85 4908.38
Owashi Matsue City 424.452 4075.98 4908.38
Okayasu Maizuru City 422.568 4800.74 4908.38
Katsuyama Kariwa Village 421.280 4370.18 4908.38
Kita-koubu Matsue City 420.683 4470.63 4908.38
Kichisaka Maizuru City 413.065 5834.09 4908.38
Nagai Ohi Town 410.699 4241.1 4900.18
Shiokumi Maizuru City 407.938 7262.13 4908.38
Miyadome Ohi Town 407.831 3516.25 4908.38
Kariwa Kariwa Village 407.617 4528.07 4908.38
Ueno Satsuma-sendai City 394.248 3286.59 4908.38
Power Station-South 389.191 4786.41 4908.38
Radiation dose at JAEA Oarai (P6) 386.963 4861.87
Power Station- 385.546 4671.58 4908.38
Takae Satsuma-sendai City 379.551 3329.65 4908.38
Hokawaduura Genkai Town 378.015 5069.84 4908.38
Kou Itimatsu Suetsugu 377.929 3659.76 4908.38
Minato Satsuma-sendai City 377.656 3049.79 4908.38
Iwanai Iwanai Town 376.336 4970.2 4905.65
Hattari Kyowa Town 373.047 4833.91 4905.65
Chatsu Tomari Village 371.011 4618.75 4905.65
Oyama Maizuru City 358.223 4205.15 4908.38
Kodaira Satsuma-sendai City 355.545 3085.69 4908.38
Kayanuma Tomari Village 354.809 4109.56 4905.65
Anojiri Obama City 353.215 3444.48 4908.38
Kushi Genkai Town 349.738 6996.6 4908.38
Yamaguchi 348.715 5501.95 4900.18
Sadahongou Matsue City 348.228 4284.07 4908.38
Sakibe Karatsu City 347.801 6630.62 4908.38
Hirao Genkai Town 343.814 6989.41 4908.38
The Meteorological Obsevatory of kyowa Town 343.275 4582.91 4905.65
Minami-Horoni Kyowa Town 335.180 4296.01 4905.65
Kounoura Takahama Town 330.353 3631.04 4908.38
Kyoudomarisaki Karatsu City 328.622 7104.24 4908.38
Horikappu Jinja Tomari Village 328.230 4446.63 4905.65
Hukada-kita Matsue City 327.031 3523.4 4908.38
Radiation dose in KEK, Tsukuba 326.240 4881.02
Herokaruusu Tomari Village 324.242 4611.61 4905.65
Yorita Satsuma-sendai City 323.218 3609.51 4908.38
Kamoenai Kamoenai Village 322.032 3894.4 4905.65
Radiation dose in Onagawa (MP-6) 316.267 4859.14
Imamura Genkai Town 314.749 60206.5 4908.38
Yamanaka Takahama Town 314.185 4685.91 4908.38
Sendai (Miyagi) 312.585 2205.08 4900.18
Radiation dose in Onagawa (MP-1) 300.147 4859.14
Gumisaki Satsuma-sendai City 295.693 2913.47 4908.38
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4881.02
Aomori Aomori City 285.372 2962.02 4905.65
Misawa City hall Misawa City 283.728 5744.77 4905.65
Kashu Ikata Town 277.173 3006.73 4908.38
Noheji Town Office Noheji Town 272.004 2538.89 4905.65
Takasimamati 271.103 3200.48 4908.38
Radiation dose in Onagawa (MP-3) 270.563 4859.14
Kucho Ikata Town 269.545 2655.13 4908.38
Radiation dose in Marumori 269.436 4861.87
Kawanagata Ikata Town 266.821 2590.55 4908.38
Tochigi 260.733 2879.93 4900.18
Chikagawa Mutu City 256.719 3306.28 4905.65
Yokohama Town Office Yokohama Town 254.846 4052.19 4905.65
Tokyo 251.877 3395.74 4900.18
Hiranuma Rokkasho Village 251.186 2660.8 4905.65
Taisei Ikata Town 246.293 1944.71 4908.38
Chitose-daira Rokkasho Village 245.868 2868.81 4905.65
Gifu 243.951 4728.24 4900.18
Fukkoshi Yokohama Town 243.102 2782.75 4905.65
Shimane 240.651 4728.24 4900.18
Sunagomata Higashidoori Village 238.012 4023.49 4905.65
Obuchi Rokkasho Village 237.506 3198.7 4905.65
Tomari Rokkasho Village 230.636 4475.33 4905.65
kanagawa 226.339 2965.9 4900.18
Saitama 219.770 2579.04 4900.18
Ikatagoshi Ikata Town 217.515 2447 4908.38
Touhoku Branch office Touhoku Town 215.416 2316.54 4905.65
Radiation dose at Tohoku University 214.824 4861.87
Odanosawa Higashidoori Village 210.287 3205.88 4905.65
Kagawa 205.829 3309.77 4900.18
Oippe Higashidoori Village 205.182 2761.23 4905.65
Oita 200.921 3653.64 4900.18
Touhoku Town office Touhoku Town 200.811 10715 4905.65
Kuchogoshi Ikata Town 198.646 2482.91 4908.38
Minatoura Ikata Town 186.776 2231.72 4908.38
Radiation dose in Koyadori, Ojika 184.905 4856.4
Toyama 184.580 6318.65 4900.18
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3048.46 4894.7
Radiation dose in Tukahama, Ojika 183.417 4856.4
Chiba 182.407 1891.3 4900.18
Nara 182.387 3438.72 4900.18
Okayama 181.976 4470.34 4900.18
Yamagata 181.598 3524.69 4900.18
Ehime 180.745 3180.82 4900.18
Ishikawa 180.445 5480.46 4900.18
Niigata 177.483 6576.55 4900.18
Hiroshima 176.816 2965.9 4900.18
Mie 174.867 3391.44 4900.18
Fukui 170.045 4169.45 4900.18
Radiation dose in Terama, Ojika 168.036 4856.4
Yamanashi 164.561 2750.98 4900.18
Nagano 162.242 4186.64 4900.18
Saga 161.421 3696.62 4900.18
Tottori 161.392 3395.74 4900.18
Radiation dose in Enoshima, Ojika 160.091 4856.4
Osaka 159.103 2622.02 4900.18
Ibaraki-city Environment 157.249 4815.36
Aichi 149.345 3180.82 4900.18
Toyonoura Ikata Town 149.214 2561.83 4908.38
Shizuoka 148.639 3288.28 4900.18
Kyoto 144.522 3739.61 4900.18
Kagoshima 144.449 4053.39 4900.18
Tokushima 143.627 2879.93 4900.18
Gunma 143.572 1934.28 4900.18
Hyogo 139.710 3266.78 4900.18
Fukuoka 136.511 3395.74 4900.18
Wakayama 133.857 2407.1 4900.18
Radiation at Tamaki-cho Mie Japan 133.138 4815.36
Akita 132.832 3696.62 4900.18
Shiga 124.919 2622.02 4900.18
Nagasaki 109.459 2965.9 4900.18
Hokkaido 109.189 4513.32 4900.18
Kumamoto 103.568 2879.93 4900.18
Aomori 101.819 4384.37 4900.18
Miyazaki 100.354 2854.14 4900.18
Kochi 95.931 3266.78 4900.18
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3039.94 4881.02
Iwate 90.324 3610.66 4900.18
Environment Feeds from Ohta 83.623 4815.36
Okinawa 82.305 2471.58 4900.18
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