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Accumulated absorbed dose rate - T=13.03.2011 - 25.10.2014(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 3532.18
Fukushima I MP8 570942.000 3532.18
Fukushima I MP6 240668.000 3532.18
Yamada Futaba Town 176983.000 2592.19 3088.94
Fukushima I MP2 140420.000 3532.18
Fukushima I MP5 111325.000 3532.18
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2244.17 3603.31
Fukushima I MP3 93730.602 3532.18
Fukushima I MP4 86821.500 3532.18
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2244.17 3603.31
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2193.05 3521.23
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2244.17 3603.31
Ono Okuma Town 38610.500 2393.47 3088.94
Shinzan Futaba Town 38332.801 2172.21 3088.94
Fukushima I MP1 31496.801 3532.18
Yonomori Tomioka Town 29815.900 2474.76 3088.94
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2244.17 3603.31
Tomioka Tomioka Town 25324.500 2664.43 3088.94
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2244.17 3603.31
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2244.17 3603.31
Shimo-Kooriyama Tomioka Town 13057.000 2646.39 3088.94
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2244.17 3603.31
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2244.17 3603.31
Kami-kooriyama Tomioka Town 11803.900 2077.37 3088.94
Fukushima II MP3 11060.600 3532.18
Fukushima II MP1 10903.000 3532.18
Kooriyama Futaba Town 10352.900 2420.57 3088.94
Fukushima II MP4 9696.330 3532.18
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2240.76 3597.84
Fukushima II MP5 9382.150 3532.18
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2244.17 3603.31
Matsudate Naraha Town 8410.890 2827.01 3088.94
Shigeoka Naraha Town 8115.970 3125.06 3088.94
Fukushima II MP2 7875.320 3532.18
Namie Namie Town 7321.210 2280.59 3088.94
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3548.59
Fukushima II MP6 7062.690 3532.18
Fukushima II MP7 6511.580 3529.44
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2244.17 3603.31
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2244.17 3603.31
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2244.17 3603.31
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2244.17 3603.31
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2244.17 3603.31
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2244.17 3603.31
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2239.06 3595.1
Futatsunuma Hirono Town 3520.340 2709.6 3088.94
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2244.17 3603.31
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2244.17 3603.31
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3545.86
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2244.17 3603.31
Kiyohashi Namie Town 3162.000 2000.58 3088.94
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2239.06 3595.1
Radiation dose at Agricultural center, Koriyama 3128.960 3545.86
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2244.17 3603.31
Radiation dose at Koriyama city office, Koriyama 2803.520 3545.86
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2244.17 3603.31
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2239.06 3595.1
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2244.17 3603.31
Yamadaoka Naraha Town 2205.340 2402.52 3088.94
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3548.59
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2244.17 3603.31
Kuji Hitachi City 1990.890 5579.9 3614.26
Hitachinaka Hitachinaka City 1951.950 2449.91 3611.52
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2239.06 3595.1
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2239.06 3595.1
Momiyama Hokota City 1837.540 2795.25 3614.26
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2239.06 3595.1
Horiguchi Hitachinaka City 1779.410 2443.06 3616.99
Onuma Hitachi City 1776.950 2080.33 3611.52
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2244.17 3603.31
Tsukuriya Hokota City 1736.890 2351.39 3614.26
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3545.86
Nemoto Hitachioomiya City 1633.190 2618.89 3611.52
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2244.17 3603.31
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2244.17 3603.31
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3554.06
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2244.17 3603.31
Radiation dose at JAEA Oarai (P12) 1512.140 3570.48
Radiation dose at Ose administration center, Koriyama 1494.270 3545.86
Araji Hokota City 1437.760 2356.65 3614.26
Ishigami Tokai Village 1431.690 2145.31 3614.26
Mawatari Hitachinaka City 1422.870 2478.21 3614.26
Radiation dose at JAEA Oarai (P11) 1399.370 3570.48
Onuki Oarai Town 1387.990 2573.32 3614.26
Sawa Hitachinaka City 1353.770 1943.03 3611.52
Toyooka Tokai Village 1321.760 2361.95 3614.26
Ajigaura Hitachinaka City 1313.890 2323.19 3611.52
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2244.17 3603.31
Geiger Counter Feeds from Asao Kawasaki 1266.620 3523.97
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3545.86
Isohama Oarai Town 1250.540 2242.29 3608.78
Ebisawa Ibaraki Town 1222.240 6088.9 3611.52
Muramatsu Tokai Village 1203.520 2383.09 3614.26
Kamitoda Hokota City 1184.740 1955.09 3614.26
Yanagisawa Hitachinaka City 1166.970 1990.55 3611.52
Tokushuku Hokota City 1159.730 1764.87 3614.26
Tasaki Hokota City 1153.300 2080.29 3584.16
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2244.17 3603.31
Kadobe Naka City 1086.580 4741.45 3611.52
Radiation dose at Date city office, Date 1076.050 3548.59
Oshinobe Tokai Village 1041.340 2224.57 3614.26
Oba Mito City 1037.670 7307.77 3614.26
Godai Naka City 1031.270 1928.65 3614.26
Ishikawa Mito City 1030.810 2273.85 3616.99
Isobe Hitachiota City 1013.130 10969.6 3614.26
Yatabe Ibaraki Town 996.127 1907.53 3614.26
Radiation dose at Motomiya city office, Motomiya 992.703 3548.59
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2239.06 3595.1
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2239.06 3595.1
Yokobori Naka City 930.280 2235.13 3614.26
Sugaya Naka City 926.186 3416.06 3616.99
Kounosu Naka City 926.087 1743.72 3614.26
Funaishikawa Tokai Village 900.399 2314.39 3614.26
Nukada Naka City 899.900 2089.3 3608.78
Uridura Naka City 890.113 1994.33 3608.78
Shiraki Tsuruga City 881.330 4235.69 3616.99
Motokomezaki Naka City 880.851 1853.54 3581.42
Shiraki pass Tsuruga City 850.284 4436.62 3616.99
Radiation dose in Yamamoto 846.633 3570.48
Yoshizawa Mito City 837.646 2018.5 3614.26
Radiation dose at JAEA Oarai (P7) 831.135 3570.48
Mayumi Hitachiota City 828.119 2002.65 3614.26
Urasoko Tsuruga City 826.465 3516.51 3616.99
Nemoto Hitachioomiya City 825.588 2254.57 3611.52
Takenami Mihama Town 804.283 3691.01 3616.99
Radiation dose at JAEA Oarai (P15) 780.207 3570.48
Tateishi Tsuruga City 780.092 2924.27 3616.99
Radiation dose at JAEA Oarai (P14) 770.174 3570.48
Radiation dose at JAEA Oarai (P13) 769.612 3570.48
Ukishima Kawasaki Ward 735.475 6900.84 3616.99
Kume Hitachiota City 713.958 1960.35 3614.26
Radiation dose at JAEA Oarai (P2) 712.011 3570.48
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2239.06 3595.1
Nyuu Mihama Town 674.787 3363.17 3616.99
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2244.17 3603.31
Radiation dose in Iwanuma 670.242 3570.48
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2244.17 3603.31
Tsuruga Tsuruga City 655.360 2966.57 3616.99
Shiohama Kawasaki Ward 653.536 2369.03 3616.99
Radiation dose in Kakuda 649.863 3570.48
Sakajiri Mihama Town 649.252 3923.71 3616.99
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2464.22 3616.99
Radiation dose in Onagawa (MP-2) 632.968 3567.74
Kumatori town Nishi primary school Station 631.491 2945.41 3616.99
Oshima Kawasaki Ward 630.402 2257.99 3616.99
Izumisano municipal Oike athletic field Station 629.920 3320.87 3616.99
Atom-kyoudou nursery school Station 625.566 3188.66 3616.99
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2903.11 3616.99
Nakamachi Omaezaki City 623.494 3738.61 3616.99
Uraga Yokosuka City 622.492 1771.47 3616.99
Goritoge Shika Town 622.143 3971.3 3616.99
Kumatori town Minami primary school Station 606.134 3379.03 3616.99
Radiation dose at JAEA Oarai (P1) 603.643 3573.22
Yamanotedai-No.1 Park Station 599.140 3151.64 3616.99
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3589.63
Noumi Shika Town 594.021 3928.97 3616.99
Radiation dose in Watari 591.851 3570.48
Hairando Yokosuka City 588.667 2220.96 3616.99
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2244.17 3603.31
Ningyotoge Kagamino Town 574.857 3151.64 3616.99
Ten-no Kagamino Town 569.960 3775.63 3616.99
Funagura Yokosuka City 563.909 2094.05 3616.99
Chidori Kawasaki Ward 560.211 2025.29 3616.99
Radiation dose at JAEA Oarai (P16) 556.365 3570.48
Shika Shika Town 551.376 3786.2 3616.99
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2458.92 3616.99
Sahara Yokosuka City 547.404 1961.84 3616.99
Kazanashi Shika Town 545.377 3553.54 3616.99
Akasumi Shika Town 544.970 3252.12 3616.99
Kurahashi Maizuru City 540.820 2961.27 3616.99
Obama Obama City 540.809 2649.29 3616.99
Sakuragaike community hall Omaezaki City 540.772 3833.79 3616.99
Shirowa primary school Omaezaki City 535.692 3754.47 3616.99
Radiation dose at JAEA Oarai (P5) 529.759 3570.48
Uenohara Omaezaki City 529.333 3860.25 3616.99
Kumano Shika Town 529.019 3685.75 3616.99
Izumisano municipal Hineno filtration plant Station 527.471 3178.1 3616.99
Nishi-hamasada Matsue City 525.089 3511.1 3600.58
Kouno Minami-Echizen Town 525.028 2665.15 3616.99
Kurihama Yokosuka City 523.708 2120.48 3616.99
Osaka prefectural Kumatori off-site-center Station 522.808 2929.54 3616.99
Ogasa branch Kikugawa City 522.039 3898.31 3603.31
Izumisano municipal Hineno primary scool Station 518.181 2543.54 3616.99
Shirasuna Omaezaki City 499.479 3780.93 3616.99
Jitougata primary school Makinohara City 498.059 3627.56 3616.99
Kataku Matsue City 497.007 2818.49 3616.99
Nishihemi Yokosuka City 496.917 1692.15 3616.99
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3589.63
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2776.2 3616.99
Otomi Takahama Town 494.821 3109.34 3616.99
Otsu Nanao City 493.895 3119.91 3616.99
The Observation point for comparison Tatsunokuchi 493.454 2569.97 3616.99
Hitsuhama Ohi Town 492.630 2892.55 3616.99
Kijiyama Misasa Town 489.284 2934.84 3616.99
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3589.63
Hiraba Omaezaki City 485.878 3780.93 3616.99
Tayu Matsue City 484.956 2940.14 3616.99
Hamaokakita primary school Omaezaki City 484.537 3871.98 3603.31
Oitomi Ayabe City 474.670 3728.04 3616.99
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3589.63
Kashiwazaki-shigai Kashiwazaki City 470.822 2966.57 3616.99
Mitsu Matsue City 466.897 2813.23 3616.99
Tonomachi Kawasaki Ward 463.967 3564.1 3616.99
Daitou branch Kakegawa City 463.829 3814.04 3603.31
Fukura Shika Town 462.493 3548.24 3616.99
Nagasawa Yokosuka City 462.365 2072.89 3616.99
The athletic field Station of Kinki University 461.661 2342.57 3616.99
Koura Matsue City 461.049 3357.87 3616.99
Sakurasan Ward Omaezaki City 459.434 3659.29 3616.99
Tsuchikawa Nanao City 458.915 3453.05 3616.99
Kumatori Town office Station 457.917 2416.63 3616.99
Shinkango Omaezaki City 449.013 4235.69 3616.99
Ogurui Takahama Town 448.279 2770.9 3616.99
Kusabue Omaezaki City 444.162 3992.43 3616.99
Omaezaki City monitoring center 443.946 3918.41 3616.99
Akawase Kagamino Town 442.246 2416.63 3616.99
Ibaraki 442.139 1772.74 3608.78
Hinode Town Yokosuka City 438.324 1396.03 3616.99
Nishiyama Kashiwazaki City 437.251 4198.66 3616.99
Kariwa Kariwa Village 436.307 3167.5 3616.99
Osaka prefectural Hineno high scool Station 435.745 2823.79 3616.99
Miyagawa Kashiwazaki City 435.245 3125.21 3616.99
Radiation dose in Natori 434.640 3570.48
Kami-koubu Matsue City 433.868 3072.32 3616.99
Shimo-Takamachi Kariwa Village 433.192 3447.79 3616.99
Osaka prefectural Sano supporting school Station 432.398 3077.62 3616.99
Arahama Kashiwazaki City 428.874 3220.39 3616.99
Doai Kashiwazaki City 425.681 3030.02 3616.99
Owashi Matsue City 424.452 3003.59 3616.99
Okayasu Maizuru City 422.568 3537.67 3616.99
Katsuyama Kariwa Village 421.280 3220.39 3616.99
Kita-koubu Matsue City 420.683 3294.41 3616.99
Kichisaka Maizuru City 413.065 4299.14 3616.99
Nagai Ohi Town 410.699 3123.4 3608.78
Shiokumi Maizuru City 407.938 5351.47 3616.99
Miyadome Ohi Town 407.831 2591.13 3616.99
Kariwa Kariwa Village 407.617 3336.74 3616.99
Ueno Satsuma-sendai City 394.248 2421.89 3616.99
Power Station-South 389.191 3527.11 3616.99
Radiation dose at JAEA Oarai (P6) 386.963 3570.48
Power Station- 385.546 3442.49 3616.99
Takae Satsuma-sendai City 379.551 2453.62 3616.99
Hokawaduura Genkai Town 378.015 3735.97 3616.99
Kou Itimatsu Suetsugu 377.929 2696.88 3616.99
Minato Satsuma-sendai City 377.656 2247.39 3616.99
Iwanai Iwanai Town 376.336 3661.81 3614.26
Hattari Kyowa Town 373.047 3561.41 3614.26
Chatsu Tomari Village 371.011 3402.89 3614.26
Oyama Maizuru City 358.223 3098.78 3616.99
Kodaira Satsuma-sendai City 355.545 2273.85 3616.99
Kayanuma Tomari Village 354.809 3027.73 3614.26
Anojiri Obama City 353.215 2538.24 3616.99
Kushi Genkai Town 349.738 5155.8 3616.99
Yamaguchi 348.715 4051.97 3608.78
Sadahongou Matsue City 348.228 3156.94 3616.99
Sakibe Karatsu City 347.801 4886.11 3616.99
Hirao Genkai Town 343.814 5150.5 3616.99
The Meteorological Obsevatory of kyowa Town 343.275 3376.48 3614.26
Minami-Horoni Kyowa Town 335.180 3165.11 3614.26
Kounoura Takahama Town 330.353 2675.72 3616.99
Kyoudomarisaki Karatsu City 328.622 5235.12 3616.99
Horikappu Jinja Tomari Village 328.230 3276.07 3614.26
Hukada-kita Matsue City 327.031 2596.4 3616.99
Radiation dose in KEK, Tsukuba 326.240 3589.63
Herokaruusu Tomari Village 324.242 3397.62 3614.26
Yorita Satsuma-sendai City 323.218 2659.85 3616.99
Kamoenai Kamoenai Village 322.032 2869.21 3614.26
Radiation dose in Onagawa (MP-6) 316.267 3567.74
Imamura Genkai Town 314.749 44366.2 3616.99
Yamanaka Takahama Town 314.185 3453.05 3616.99
Sendai (Miyagi) 312.585 1623.95 3608.78
Radiation dose in Onagawa (MP-1) 300.147 3567.74
Gumisaki Satsuma-sendai City 295.693 2146.94 3616.99
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3589.63
Aomori Aomori City 285.372 2182.28 3614.26
Misawa City hall Misawa City 283.728 4232.48 3614.26
Kashu Ikata Town 277.173 2215.66 3616.99
Noheji Town Office Noheji Town 272.004 1870.54 3614.26
Takasimamati 271.103 2358.44 3616.99
Radiation dose in Onagawa (MP-3) 270.563 3567.74
Kucho Ikata Town 269.545 1956.57 3616.99
Radiation dose in Marumori 269.436 3570.48
Kawanagata Ikata Town 266.821 1908.98 3616.99
Tochigi 260.733 2120.95 3608.78
Chikagawa Mutu City 256.719 2435.91 3614.26
Yokohama Town Office Yokohama Town 254.846 2985.47 3614.26
Tokyo 251.877 2500.82 3608.78
Hiranuma Rokkasho Village 251.186 1960.35 3614.26
Taisei Ikata Town 246.293 1433.06 3616.99
Chitose-daira Rokkasho Village 245.868 2113.61 3614.26
Gifu 243.951 3482.16 3608.78
Fukkoshi Yokohama Town 243.102 2050.2 3614.26
Shimane 240.651 3482.16 3608.78
Sunagomata Higashidoori Village 238.012 2964.32 3614.26
Obuchi Rokkasho Village 237.506 2356.65 3614.26
Tomari Rokkasho Village 230.636 3297.22 3614.26
kanagawa 226.339 2184.26 3608.78
Saitama 219.770 1899.36 3608.78
Ikatagoshi Ikata Town 217.515 1803.2 3616.99
Touhoku Branch office Touhoku Town 215.416 1706.72 3614.26
Radiation dose at Tohoku University 214.824 3570.48
Odanosawa Higashidoori Village 210.287 2361.95 3614.26
Kagawa 205.829 2437.51 3608.78
Oippe Higashidoori Village 205.182 2034.35 3614.26
Oita 200.921 2690.76 3608.78
Touhoku Town office Touhoku Town 200.811 7894.3 3614.26
Kuchogoshi Ikata Town 198.646 1829.66 3616.99
Minatoura Ikata Town 186.776 1644.56 3616.99
Radiation dose in Koyadori, Ojika 184.905 3565.01
Toyama 184.580 4653.43 3608.78
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2244.17 3603.31
Radiation dose in Tukahama, Ojika 183.417 3565.01
Chiba 182.407 1392.86 3608.78
Nara 182.387 2532.48 3608.78
Okayama 181.976 3292.22 3608.78
Yamagata 181.598 2595.79 3608.78
Ehime 180.745 2342.54 3608.78
Ishikawa 180.445 4036.14 3608.78
Niigata 177.483 4843.37 3608.78
Hiroshima 176.816 2184.26 3608.78
Mie 174.867 2497.66 3608.78
Fukui 170.045 3070.63 3608.78
Radiation dose in Terama, Ojika 168.036 3565.01
Yamanashi 164.561 2025.98 3608.78
Nagano 162.242 3083.29 3608.78
Saga 161.421 2722.42 3608.78
Tottori 161.392 2500.82 3608.78
Radiation dose in Enoshima, Ojika 160.091 3565.01
Osaka 159.103 1931.02 3608.78
Ibaraki-city Environment 157.249 3523.97
Aichi 149.345 2342.54 3608.78
Toyonoura Ikata Town 149.214 1887.82 3616.99
Shizuoka 148.639 2421.68 3608.78
Kyoto 144.522 2754.07 3608.78
Kagoshima 144.449 2985.16 3608.78
Tokushima 143.627 2120.95 3608.78
Gunma 143.572 1424.52 3608.78
Hyogo 139.710 2405.86 3608.78
Fukuoka 136.511 2500.82 3608.78
Wakayama 133.857 1772.74 3608.78
Radiation at Tamaki-cho Mie Japan 133.138 3523.97
Akita 132.832 2722.42 3608.78
Shiga 124.919 1931.02 3608.78
Nagasaki 109.459 2184.26 3608.78
Hokkaido 109.189 3323.88 3608.78
Kumamoto 103.568 2120.95 3608.78
Aomori 101.819 3228.91 3608.78
Miyazaki 100.354 2101.96 3608.78
Kochi 95.931 2405.86 3608.78
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2235.65 3589.63
Iwate 90.324 2659.1 3608.78
Environment Feeds from Ohta 83.623 3523.97
Okinawa 82.305 1820.22 3608.78
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