Bookmark

Accumulated absorbed dose rate - T=13.03.2011 - 03.09.2015(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 4388.54
Fukushima I MP8 570942.000 4388.54
Fukushima I MP6 240668.000 4388.54
Yamada Futaba Town 176983.000 3310.84 3945.31
Fukushima I MP2 140420.000 4388.54
Fukushima I MP5 111325.000 4388.54
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2777.52 4459.68
Fukushima I MP3 93730.602 4388.54
Fukushima I MP4 86821.500 4388.54
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2777.52 4459.68
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2726.4 4377.6
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2777.52 4459.68
Ono Okuma Town 38610.500 3057.03 3945.31
Shinzan Futaba Town 38332.801 2774.42 3945.31
Fukushima I MP1 31496.801 4388.54
Yonomori Tomioka Town 29815.900 3160.85 3945.31
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2777.52 4459.68
Tomioka Tomioka Town 25324.500 3403.11 3945.31
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2777.52 4459.68
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2777.52 4459.68
Shimo-Kooriyama Tomioka Town 13057.000 3380.06 3945.31
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2777.52 4459.68
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2777.52 4459.68
Kami-kooriyama Tomioka Town 11803.900 2653.29 3945.31
Fukushima II MP3 11060.600 4388.54
Fukushima II MP1 10903.000 4388.54
Kooriyama Futaba Town 10352.900 3091.64 3945.31
Fukushima II MP4 9696.330 4388.54
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2774.11 4454.21
Fukushima II MP5 9382.150 4388.54
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2777.52 4459.68
Matsudate Naraha Town 8410.890 3610.76 3945.31
Shigeoka Naraha Town 8115.970 3991.44 3945.31
Fukushima II MP2 7875.320 4388.54
Namie Namie Town 7321.210 2912.85 3945.31
Radiation dose at Shirasawa branch office, Motomiya 7287.920 4404.96
Fukushima II MP6 7062.690 4388.54
Fukushima II MP7 6511.580 4385.81
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2777.52 4459.68
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2777.52 4459.68
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2777.52 4459.68
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2777.52 4459.68
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2777.52 4459.68
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2777.52 4459.68
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2772.41 4451.47
Futatsunuma Hirono Town 3520.340 3460.8 3945.31
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2777.52 4459.68
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2777.52 4459.68
Radiation dose at Koriyama joint government building, Koriyama 3232.890 4402.22
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2777.52 4459.68
Kiyohashi Namie Town 3162.000 2555.21 3945.31
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2772.41 4451.47
Radiation dose at Agricultural center, Koriyama 3128.960 4402.22
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2777.52 4459.68
Radiation dose at Koriyama city office, Koriyama 2803.520 4402.22
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2777.52 4459.68
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2772.41 4451.47
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2777.52 4459.68
Yamadaoka Naraha Town 2205.340 3068.59 3945.31
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 4404.96
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2777.52 4459.68
Kuji Hitachi City 1990.890 6902.02 4470.62
Hitachinaka Hitachinaka City 1951.950 3030.83 4467.89
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2772.41 4451.47
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2772.41 4451.47
Momiyama Hokota City 1837.540 3457.56 4470.62
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2772.41 4451.47
Horiguchi Hitachinaka City 1779.410 3021.48 4473.36
Onuma Hitachi City 1776.950 2573.62 4467.89
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2777.52 4459.68
Tsukuriya Hokota City 1736.890 2908.53 4470.62
Radiation dose at Big palette Fukushima, Koriyama 1668.540 4402.22
Nemoto Hitachioomiya City 1633.190 3239.89 4467.89
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2777.52 4459.68
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2777.52 4459.68
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 4410.43
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2777.52 4459.68
Radiation dose at JAEA Oarai (P12) 1512.140 4426.85
Radiation dose at Ose administration center, Koriyama 1494.270 4402.22
Araji Hokota City 1437.760 2915.04 4470.62
Ishigami Tokai Village 1431.690 2653.63 4470.62
Mawatari Hitachinaka City 1422.870 3065.4 4470.62
Radiation dose at JAEA Oarai (P11) 1399.370 4426.85
Onuki Oarai Town 1387.990 3183.04 4470.62
Sawa Hitachinaka City 1353.770 2403.76 4467.89
Toyooka Tokai Village 1321.760 2921.59 4470.62
Ajigaura Hitachinaka City 1313.890 2874.07 4467.89
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2777.52 4459.68
Geiger Counter Feeds from Asao Kawasaki 1266.620 4380.34
Radiation dose at Tamokami elementary school, Koriyama 1256.140 4402.22
Isohama Oarai Town 1250.540 2774.39 4465.15
Ebisawa Ibaraki Town 1222.240 7532.7 4467.89
Muramatsu Tokai Village 1203.520 2947.75 4470.62
Kamitoda Hokota City 1184.740 2418.33 4470.62
Yanagisawa Hitachinaka City 1166.970 2462.55 4467.89
Tokushuku Hokota City 1159.730 2183.04 4470.62
Tasaki Hokota City 1153.300 2577.34 4440.53
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2777.52 4459.68
Kadobe Naka City 1086.580 5865.75 4467.89
Radiation dose at Date city office, Date 1076.050 4404.96
Oshinobe Tokai Village 1041.340 2751.67 4470.62
Oba Mito City 1037.670 9039.29 4470.62
Godai Naka City 1031.270 2385.63 4470.62
Ishikawa Mito City 1030.810 2812.21 4473.36
Isobe Hitachiota City 1013.130 13568.7 4470.62
Yatabe Ibaraki Town 996.127 2359.51 4470.62
Radiation dose at Motomiya city office, Motomiya 992.703 4404.96
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2772.41 4451.47
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2772.41 4451.47
Yokobori Naka City 930.280 2764.73 4470.62
Sugaya Naka City 926.186 4224.85 4473.36
Kounosu Naka City 926.087 2156.88 4470.62
Funaishikawa Tokai Village 900.399 2862.77 4470.62
Nukada Naka City 899.900 2585.09 4465.15
Uridura Naka City 890.113 2467.58 4465.15
Shiraki Tsuruga City 881.330 5238.54 4473.36
Motokomezaki Naka City 880.851 2296.75 4437.79
Shiraki pass Tsuruga City 850.284 5487.05 4473.36
Radiation dose in Yamamoto 846.633 4426.85
Yoshizawa Mito City 837.646 2496.77 4470.62
Radiation dose at JAEA Oarai (P7) 831.135 4426.85
Mayumi Hitachiota City 828.119 2477.16 4470.62
Urasoko Tsuruga City 826.465 4349.09 4473.36
Nemoto Hitachioomiya City 825.588 2789.18 4467.89
Takenami Mihama Town 804.283 4564.91 4473.36
Radiation dose at JAEA Oarai (P15) 780.207 4426.85
Tateishi Tsuruga City 780.092 3616.63 4473.36
Radiation dose at JAEA Oarai (P14) 770.174 4426.85
Radiation dose at JAEA Oarai (P13) 769.612 4426.85
Ukishima Kawasaki Ward 735.475 8534.7 4473.36
Kume Hitachiota City 713.958 2424.84 4470.62
Radiation dose at JAEA Oarai (P2) 712.011 4426.85
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2772.41 4451.47
Nyuu Mihama Town 674.787 4159.44 4473.36
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2777.52 4459.68
Radiation dose in Iwanuma 670.242 4426.85
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2777.52 4459.68
Tsuruga Tsuruga City 655.360 3668.94 4473.36
Shiohama Kawasaki Ward 653.536 2929.93 4473.36
Radiation dose in Kakuda 649.863 4426.85
Sakajiri Mihama Town 649.252 4852.69 4473.36
North point of Kinki University Atomic Energy Research Instirute Station 639.566 3047.65 4473.36
Radiation dose in Onagawa (MP-2) 632.968 4424.11
Kumatori town Nishi primary school Station 631.491 3642.77 4473.36
Oshima Kawasaki Ward 630.402 2792.59 4473.36
Izumisano municipal Oike athletic field Station 629.920 4107.13 4473.36
Atom-kyoudou nursery school Station 625.566 3943.62 4473.36
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3590.46 4473.36
Nakamachi Omaezaki City 623.494 4623.77 4473.36
Uraga Yokosuka City 622.492 2190.89 4473.36
Goritoge Shika Town 622.143 4911.55 4473.36
Kumatori town Minami primary school Station 606.134 4179.06 4473.36
Radiation dose at JAEA Oarai (P1) 603.643 4429.58
Yamanotedai-No.1 Park Station 599.140 3897.83 4473.36
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 4446
Noumi Shika Town 594.021 4859.21 4473.36
Radiation dose in Watari 591.851 4426.85
Hairando Yokosuka City 588.667 2746.8 4473.36
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2777.52 4459.68
Ningyotoge Kagamino Town 574.857 3897.83 4473.36
Ten-no Kagamino Town 569.960 4669.56 4473.36
Funagura Yokosuka City 563.909 2589.84 4473.36
Chidori Kawasaki Ward 560.211 2504.81 4473.36
Radiation dose at JAEA Oarai (P16) 556.365 4426.85
Shika Shika Town 551.376 4682.63 4473.36
Higashiosaka municipal Kamikosaka primary scool Station 550.277 3041.1 4473.36
Sahara Yokosuka City 547.404 2426.33 4473.36
Kazanashi Shika Town 545.377 4394.88 4473.36
Akasumi Shika Town 544.970 4022.1 4473.36
Kurahashi Maizuru City 540.820 3662.39 4473.36
Obama Obama City 540.809 3276.54 4473.36
Sakuragaike community hall Omaezaki City 540.772 4741.49 4473.36
Shirowa primary school Omaezaki City 535.692 4643.39 4473.36
Radiation dose at JAEA Oarai (P5) 529.759 4426.85
Uenohara Omaezaki City 529.333 4774.21 4473.36
Kumano Shika Town 529.019 4558.39 4473.36
Izumisano municipal Hineno filtration plant Station 527.471 3930.55 4473.36
Nishi-hamasada Matsue City 525.089 4346.19 4456.94
Kouno Minami-Echizen Town 525.028 3296.16 4473.36
Kurihama Yokosuka City 523.708 2622.53 4473.36
Osaka prefectural Kumatori off-site-center Station 522.808 3623.15 4473.36
Ogasa branch Kikugawa City 522.039 4824.79 4459.68
Izumisano municipal Hineno primary scool Station 518.181 3145.75 4473.36
Shirasuna Omaezaki City 499.479 4676.11 4473.36
Jitougata primary school Makinohara City 498.059 4486.43 4473.36
Kataku Matsue City 497.007 3485.81 4473.36
Nishihemi Yokosuka City 496.917 2092.79 4473.36
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 4446
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3433.5 4473.36
Otomi Takahama Town 494.821 3845.52 4473.36
Otsu Nanao City 493.895 3858.59 4473.36
The Observation point for comparison Tatsunokuchi 493.454 3178.44 4473.36
Hitsuhama Ohi Town 492.630 3577.39 4473.36
Kijiyama Misasa Town 489.284 3629.7 4473.36
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 4446
Hiraba Omaezaki City 485.878 4676.11 4473.36
Tayu Matsue City 484.956 3636.25 4473.36
Hamaokakita primary school Omaezaki City 484.537 4792.2 4459.68
Oitomi Ayabe City 474.670 4610.7 4473.36
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 4446
Kashiwazaki-shigai Kashiwazaki City 470.822 3668.94 4473.36
Mitsu Matsue City 466.897 3479.29 4473.36
Tonomachi Kawasaki Ward 463.967 4407.95 4473.36
Daitou branch Kakegawa City 463.829 4720.49 4459.68
Fukura Shika Town 462.493 4388.33 4473.36
Nagasawa Yokosuka City 462.365 2563.67 4473.36
The athletic field Station of Kinki University 461.661 2897.21 4473.36
Koura Matsue City 461.049 4152.89 4473.36
Sakurasan Ward Omaezaki City 459.434 4525.67 4473.36
Tsuchikawa Nanao City 458.915 4270.61 4473.36
Kumatori Town office Station 457.917 2988.79 4473.36
Shinkango Omaezaki City 449.013 5238.54 4473.36
Ogurui Takahama Town 448.279 3426.95 4473.36
Kusabue Omaezaki City 444.162 4937.69 4473.36
Omaezaki City monitoring center 443.946 4846.14 4473.36
Akawase Kagamino Town 442.246 2988.79 4473.36
Ibaraki 442.139 2193.41 4465.15
Hinode Town Yokosuka City 438.324 1726.56 4473.36
Nishiyama Kashiwazaki City 437.251 5192.75 4473.36
Kariwa Kariwa Village 436.307 3917.45 4473.36
Osaka prefectural Hineno high scool Station 435.745 3492.36 4473.36
Miyagawa Kashiwazaki City 435.245 3865.14 4473.36
Radiation dose in Natori 434.640 4426.85
Kami-koubu Matsue City 433.868 3799.73 4473.36
Shimo-Takamachi Kariwa Village 433.192 4264.09 4473.36
Osaka prefectural Sano supporting school Station 432.398 3806.28 4473.36
Arahama Kashiwazaki City 428.874 3982.86 4473.36
Doai Kashiwazaki City 425.681 3747.42 4473.36
Owashi Matsue City 424.452 3714.73 4473.36
Okayasu Maizuru City 422.568 4375.26 4473.36
Katsuyama Kariwa Village 421.280 3982.86 4473.36
Kita-koubu Matsue City 420.683 4074.41 4473.36
Kichisaka Maizuru City 413.065 5317.02 4473.36
Nagai Ohi Town 410.699 3864.59 4465.15
Shiokumi Maizuru City 407.938 6618.49 4473.36
Miyadome Ohi Town 407.831 3204.61 4473.36
Kariwa Kariwa Village 407.617 4126.75 4473.36
Ueno Satsuma-sendai City 394.248 2995.31 4473.36
Power Station-South 389.191 4362.19 4473.36
Radiation dose at JAEA Oarai (P6) 386.963 4426.85
Power Station- 385.546 4257.54 4473.36
Takae Satsuma-sendai City 379.551 3034.55 4473.36
Hokawaduura Genkai Town 378.015 4620.51 4473.36
Kou Itimatsu Suetsugu 377.929 3335.4 4473.36
Minato Satsuma-sendai City 377.656 2779.49 4473.36
Iwanai Iwanai Town 376.336 4529.45 4470.62
Hattari Kyowa Town 373.047 4405.25 4470.62
Chatsu Tomari Village 371.011 4209.17 4470.62
Oyama Maizuru City 358.223 3832.45 4473.36
Kodaira Satsuma-sendai City 355.545 2812.21 4473.36
Kayanuma Tomari Village 354.809 3745.13 4470.62
Anojiri Obama City 353.215 3139.2 4473.36
Kushi Genkai Town 349.738 6376.5 4473.36
Yamaguchi 348.715 5013.5 4465.15
Sadahongou Matsue City 348.228 3904.38 4473.36
Sakibe Karatsu City 347.801 6042.96 4473.36
Hirao Genkai Town 343.814 6369.95 4473.36
The Meteorological Obsevatory of kyowa Town 343.275 4176.5 4470.62
Minami-Horoni Kyowa Town 335.180 3915.05 4470.62
Kounoura Takahama Town 330.353 3309.23 4473.36
Kyoudomarisaki Karatsu City 328.622 6474.6 4473.36
Horikappu Jinja Tomari Village 328.230 4052.31 4470.62
Hukada-kita Matsue City 327.031 3211.13 4473.36
Radiation dose in KEK, Tsukuba 326.240 4446
Herokaruusu Tomari Village 324.242 4202.66 4470.62
Yorita Satsuma-sendai City 323.218 3289.61 4473.36
Kamoenai Kamoenai Village 322.032 3549.05 4470.62
Radiation dose in Onagawa (MP-6) 316.267 4424.11
Imamura Genkai Town 314.749 54870.5 4473.36
Yamanaka Takahama Town 314.185 4270.61 4473.36
Sendai (Miyagi) 312.585 2009.32 4465.15
Radiation dose in Onagawa (MP-1) 300.147 4424.11
Gumisaki Satsuma-sendai City 295.693 2655.25 4473.36
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 4446
Aomori Aomori City 285.372 2699.35 4470.62
Misawa City hall Misawa City 283.728 5235.34 4470.62
Kashu Ikata Town 277.173 2740.25 4473.36
Noheji Town Office Noheji Town 272.004 2313.74 4470.62
Takasimamati 271.103 2916.83 4473.36
Radiation dose in Onagawa (MP-3) 270.563 4424.11
Kucho Ikata Town 269.545 2419.81 4473.36
Radiation dose in Marumori 269.436 4426.85
Kawanagata Ikata Town 266.821 2360.95 4473.36
Tochigi 260.733 2624.26 4465.15
Chikagawa Mutu City 256.719 3013.08 4470.62
Yokohama Town Office Yokohama Town 254.846 3692.85 4470.62
Tokyo 251.877 3094.27 4465.15
Hiranuma Rokkasho Village 251.186 2424.84 4470.62
Taisei Ikata Town 246.293 1772.35 4473.36
Chitose-daira Rokkasho Village 245.868 2614.41 4470.62
Gifu 243.951 4308.48 4465.15
Fukkoshi Yokohama Town 243.102 2535.98 4470.62
Shimane 240.651 4308.48 4465.15
Sunagomata Higashidoori Village 238.012 3666.7 4470.62
Obuchi Rokkasho Village 237.506 2915.04 4470.62
Tomari Rokkasho Village 230.636 4078.46 4470.62
kanagawa 226.339 2702.59 4465.15
Saitama 219.770 2350.08 4465.15
Ikatagoshi Ikata Town 217.515 2230.13 4473.36
Touhoku Branch office Touhoku Town 215.416 2111.11 4470.62
Radiation dose at Tohoku University 214.824 4426.85
Odanosawa Higashidoori Village 210.287 2921.59 4470.62
Kagawa 205.829 3015.94 4465.15
Oippe Higashidoori Village 205.182 2516.37 4470.62
Oita 200.921 3329.28 4465.15
Touhoku Town office Touhoku Town 200.811 9764.78 4470.62
Kuchogoshi Ikata Town 198.646 2262.85 4473.36
Minatoura Ikata Town 186.776 2033.93 4473.36
Radiation dose in Koyadori, Ojika 184.905 4421.38
Toyama 184.580 5757.7 4465.15
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2777.52 4459.68
Radiation dose in Tukahama, Ojika 183.417 4421.38
Chiba 182.407 1723.39 4465.15
Nara 182.387 3133.44 4465.15
Okayama 181.976 4073.47 4465.15
Yamagata 181.598 3211.78 4465.15
Ehime 180.745 2898.43 4465.15
Ishikawa 180.445 4993.92 4465.15
Niigata 177.483 5992.7 4465.15
Hiroshima 176.816 2702.59 4465.15
Mie 174.867 3090.36 4465.15
Fukui 170.045 3799.3 4465.15
Radiation dose in Terama, Ojika 168.036 4421.38
Yamanashi 164.561 2506.75 4465.15
Nagano 162.242 3814.96 4465.15
Saga 161.421 3368.45 4465.15
Tottori 161.392 3094.27 4465.15
Radiation dose in Enoshima, Ojika 160.091 4421.38
Osaka 159.103 2389.25 4465.15
Ibaraki-city Environment 157.249 4380.34
Aichi 149.345 2898.43 4465.15
Toyonoura Ikata Town 149.214 2334.78 4473.36
Shizuoka 148.639 2996.35 4465.15
Kyoto 144.522 3407.62 4465.15
Kagoshima 144.449 3693.54 4465.15
Tokushima 143.627 2624.26 4465.15
Gunma 143.572 1762.56 4465.15
Hyogo 139.710 2976.77 4465.15
Fukuoka 136.511 3094.27 4465.15
Wakayama 133.857 2193.41 4465.15
Radiation at Tamaki-cho Mie Japan 133.138 4380.34
Akita 132.832 3368.45 4465.15
Shiga 124.919 2389.25 4465.15
Nagasaki 109.459 2702.59 4465.15
Hokkaido 109.189 4112.64 4465.15
Kumamoto 103.568 2624.26 4465.15
Aomori 101.819 3995.14 4465.15
Miyazaki 100.354 2600.76 4465.15
Kochi 95.931 2976.77 4465.15
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2769 4446
Iwate 90.324 3290.11 4465.15
Environment Feeds from Ohta 83.623 4380.34
Okinawa 82.305 2252.16 4465.15
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