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Accumulated absorbed dose rate - T=13.03.2011 - 22.07.2014(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 3272.26
Fukushima I MP8 570942.000 3272.26
Fukushima I MP6 240668.000 3272.26
Yamada Futaba Town 176983.000 2374.07 2829.02
Fukushima I MP2 140420.000 3272.26
Fukushima I MP5 111325.000 3272.26
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2082.29 3343.39
Fukushima I MP3 93730.602 3272.26
Fukushima I MP4 86821.500 3272.26
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2082.29 3343.39
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2031.17 3261.31
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2082.29 3343.39
Ono Okuma Town 38610.500 2192.07 2829.02
Shinzan Futaba Town 38332.801 1989.42 2829.02
Fukushima I MP1 31496.801 3272.26
Yonomori Tomioka Town 29815.900 2266.52 2829.02
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2082.29 3343.39
Tomioka Tomioka Town 25324.500 2440.23 2829.02
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2082.29 3343.39
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2082.29 3343.39
Shimo-Kooriyama Tomioka Town 13057.000 2423.7 2829.02
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2082.29 3343.39
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2082.29 3343.39
Kami-kooriyama Tomioka Town 11803.900 1902.57 2829.02
Fukushima II MP3 11060.600 3272.26
Fukushima II MP1 10903.000 3272.26
Kooriyama Futaba Town 10352.900 2216.89 2829.02
Fukushima II MP4 9696.330 3272.26
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2078.88 3337.92
Fukushima II MP5 9382.150 3272.26
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2082.29 3343.39
Matsudate Naraha Town 8410.890 2589.13 2829.02
Shigeoka Naraha Town 8115.970 2862.1 2829.02
Fukushima II MP2 7875.320 3272.26
Namie Namie Town 7321.210 2088.69 2829.02
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3288.67
Fukushima II MP6 7062.690 3272.26
Fukushima II MP7 6511.580 3269.52
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2082.29 3343.39
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2082.29 3343.39
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2082.29 3343.39
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2082.29 3343.39
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2082.29 3343.39
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2082.29 3343.39
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2077.18 3335.18
Futatsunuma Hirono Town 3520.340 2481.6 2829.02
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2082.29 3343.39
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2082.29 3343.39
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3285.94
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2082.29 3343.39
Kiyohashi Namie Town 3162.000 1832.24 2829.02
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2077.18 3335.18
Radiation dose at Agricultural center, Koriyama 3128.960 3285.94
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2082.29 3343.39
Radiation dose at Koriyama city office, Koriyama 2803.520 3285.94
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2082.29 3343.39
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2077.18 3335.18
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2082.29 3343.39
Yamadaoka Naraha Town 2205.340 2200.36 2829.02
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3288.67
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2082.29 3343.39
Kuji Hitachi City 1990.890 5178.62 3354.34
Hitachinaka Hitachinaka City 1951.950 2273.59 3351.6
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2077.18 3335.18
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2077.18 3335.18
Momiyama Hokota City 1837.540 2594.23 3354.34
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2077.18 3335.18
Horiguchi Hitachinaka City 1779.410 2267.5 3357.07
Onuma Hitachi City 1776.950 1930.61 3351.6
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2082.29 3343.39
Tsukuriya Hokota City 1736.890 2182.29 3354.34
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3285.94
Nemoto Hitachioomiya City 1633.190 2430.41 3351.6
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2082.29 3343.39
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2082.29 3343.39
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3294.14
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2082.29 3343.39
Radiation dose at JAEA Oarai (P12) 1512.140 3310.56
Radiation dose at Ose administration center, Koriyama 1494.270 3285.94
Araji Hokota City 1437.760 2187.17 3354.34
Ishigami Tokai Village 1431.690 1991.03 3354.34
Mawatari Hitachinaka City 1422.870 2299.99 3354.34
Radiation dose at JAEA Oarai (P11) 1399.370 3310.56
Onuki Oarai Town 1387.990 2388.26 3354.34
Sawa Hitachinaka City 1353.770 1803.19 3351.6
Toyooka Tokai Village 1321.760 2192.09 3354.34
Ajigaura Hitachinaka City 1313.890 2155.99 3351.6
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2082.29 3343.39
Geiger Counter Feeds from Asao Kawasaki 1266.620 3264.05
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3285.94
Isohama Oarai Town 1250.540 2080.79 3348.86
Ebisawa Ibaraki Town 1222.240 5650.68 3351.6
Muramatsu Tokai Village 1203.520 2211.71 3354.34
Kamitoda Hokota City 1184.740 1814.49 3354.34
Yanagisawa Hitachinaka City 1166.970 1847.29 3351.6
Tokushuku Hokota City 1159.730 1637.95 3354.34
Tasaki Hokota City 1153.300 1929.43 3324.24
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2082.29 3343.39
Kadobe Naka City 1086.580 4400.21 3351.6
Radiation dose at Date city office, Date 1076.050 3288.67
Oshinobe Tokai Village 1041.340 2064.59 3354.34
Oba Mito City 1037.670 6782.23 3354.34
Godai Naka City 1031.270 1789.95 3354.34
Ishikawa Mito City 1030.810 2110.45 3357.07
Isobe Hitachiota City 1013.130 10180.7 3354.34
Yatabe Ibaraki Town 996.127 1770.35 3354.34
Radiation dose at Motomiya city office, Motomiya 992.703 3288.67
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2077.18 3335.18
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2077.18 3335.18
Yokobori Naka City 930.280 2074.39 3354.34
Sugaya Naka City 926.186 3170.58 3357.07
Kounosu Naka City 926.087 1618.32 3354.34
Funaishikawa Tokai Village 900.399 2147.95 3354.34
Nukada Naka City 899.900 1938.82 3348.86
Uridura Naka City 890.113 1850.69 3348.86
Shiraki Tsuruga City 881.330 3931.31 3357.07
Motokomezaki Naka City 880.851 1719.02 3321.5
Shiraki pass Tsuruga City 850.284 4117.8 3357.07
Radiation dose in Yamamoto 846.633 3310.56
Yoshizawa Mito City 837.646 1873.34 3354.34
Radiation dose at JAEA Oarai (P7) 831.135 3310.56
Mayumi Hitachiota City 828.119 1858.63 3354.34
Urasoko Tsuruga City 826.465 3263.81 3357.07
Nemoto Hitachioomiya City 825.588 2092.31 3351.6
Takenami Mihama Town 804.283 3425.77 3357.07
Radiation dose at JAEA Oarai (P15) 780.207 3310.56
Tateishi Tsuruga City 780.092 2714.13 3357.07
Radiation dose at JAEA Oarai (P14) 770.174 3310.56
Radiation dose at JAEA Oarai (P13) 769.612 3310.56
Ukishima Kawasaki Ward 735.475 6404.94 3357.07
Kume Hitachiota City 713.958 1819.37 3354.34
Radiation dose at JAEA Oarai (P2) 712.011 3310.56
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2077.18 3335.18
Nyuu Mihama Town 674.787 3121.49 3357.07
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2082.29 3343.39
Radiation dose in Iwanuma 670.242 3310.56
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2082.29 3343.39
Tsuruga Tsuruga City 655.360 2753.39 3357.07
Shiohama Kawasaki Ward 653.536 2198.79 3357.07
Radiation dose in Kakuda 649.863 3310.56
Sakajiri Mihama Town 649.252 3641.75 3357.07
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2287.14 3357.07
Radiation dose in Onagawa (MP-2) 632.968 3307.82
Kumatori town Nishi primary school Station 631.491 2733.75 3357.07
Oshima Kawasaki Ward 630.402 2095.73 3357.07
Izumisano municipal Oike athletic field Station 629.920 3082.23 3357.07
Atom-kyoudou nursery school Station 625.566 2959.52 3357.07
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2694.49 3357.07
Nakamachi Omaezaki City 623.494 3469.95 3357.07
Uraga Yokosuka City 622.492 1644.17 3357.07
Goritoge Shika Town 622.143 3685.92 3357.07
Kumatori town Minami primary school Station 606.134 3136.21 3357.07
Radiation dose at JAEA Oarai (P1) 603.643 3313.3
Yamanotedai-No.1 Park Station 599.140 2925.16 3357.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3329.71
Noumi Shika Town 594.021 3646.63 3357.07
Radiation dose in Watari 591.851 3310.56
Hairando Yokosuka City 588.667 2061.36 3357.07
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2082.29 3343.39
Ningyotoge Kagamino Town 574.857 2925.16 3357.07
Ten-no Kagamino Town 569.960 3504.31 3357.07
Funagura Yokosuka City 563.909 1943.57 3357.07
Chidori Kawasaki Ward 560.211 1879.75 3357.07
Radiation dose at JAEA Oarai (P16) 556.365 3310.56
Shika Shika Town 551.376 3514.12 3357.07
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2282.22 3357.07
Sahara Yokosuka City 547.404 1820.86 3357.07
Kazanashi Shika Town 545.377 3298.18 3357.07
Akasumi Shika Town 544.970 3018.42 3357.07
Kurahashi Maizuru City 540.820 2748.47 3357.07
Obama Obama City 540.809 2458.91 3357.07
Sakuragaike community hall Omaezaki City 540.772 3558.29 3357.07
Shirowa primary school Omaezaki City 535.692 3484.67 3357.07
Radiation dose at JAEA Oarai (P5) 529.759 3310.56
Uenohara Omaezaki City 529.333 3582.85 3357.07
Kumano Shika Town 529.019 3420.89 3357.07
Izumisano municipal Hineno filtration plant Station 527.471 2949.72 3357.07
Nishi-hamasada Matsue City 525.089 3257.64 3340.66
Kouno Minami-Echizen Town 525.028 2473.63 3357.07
Kurihama Yokosuka City 523.708 1968.1 3357.07
Osaka prefectural Kumatori off-site-center Station 522.808 2719.02 3357.07
Ogasa branch Kikugawa City 522.039 3617.11 3343.39
Izumisano municipal Hineno primary scool Station 518.181 2360.76 3357.07
Shirasuna Omaezaki City 499.479 3509.23 3357.07
Jitougata primary school Makinohara City 498.059 3366.88 3357.07
Kataku Matsue City 497.007 2615.95 3357.07
Nishihemi Yokosuka City 496.917 1570.55 3357.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3329.71
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2576.7 3357.07
Otomi Takahama Town 494.821 2885.9 3357.07
Otsu Nanao City 493.895 2895.71 3357.07
The Observation point for comparison Tatsunokuchi 493.454 2385.29 3357.07
Hitsuhama Ohi Town 492.630 2684.69 3357.07
Kijiyama Misasa Town 489.284 2723.94 3357.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3329.71
Hiraba Omaezaki City 485.878 3509.23 3357.07
Tayu Matsue City 484.956 2728.86 3357.07
Hamaokakita primary school Omaezaki City 484.537 3592.68 3343.39
Oitomi Ayabe City 474.670 3460.14 3357.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3329.71
Kashiwazaki-shigai Kashiwazaki City 470.822 2753.39 3357.07
Mitsu Matsue City 466.897 2611.07 3357.07
Tonomachi Kawasaki Ward 463.967 3307.98 3357.07
Daitou branch Kakegawa City 463.829 3538.92 3343.39
Fukura Shika Town 462.493 3293.26 3357.07
Nagasawa Yokosuka City 462.365 1923.93 3357.07
The athletic field Station of Kinki University 461.661 2174.23 3357.07
Koura Matsue City 461.049 3116.57 3357.07
Sakurasan Ward Omaezaki City 459.434 3396.33 3357.07
Tsuchikawa Nanao City 458.915 3204.91 3357.07
Kumatori Town office Station 457.917 2242.97 3357.07
Shinkango Omaezaki City 449.013 3931.31 3357.07
Ogurui Takahama Town 448.279 2571.78 3357.07
Kusabue Omaezaki City 444.162 3705.53 3357.07
Omaezaki City monitoring center 443.946 3636.83 3357.07
Akawase Kagamino Town 442.246 2242.97 3357.07
Ibaraki 442.139 1645.06 3348.86
Hinode Town Yokosuka City 438.324 1295.71 3357.07
Nishiyama Kashiwazaki City 437.251 3896.94 3357.07
Kariwa Kariwa Village 436.307 2939.88 3357.07
Osaka prefectural Hineno high scool Station 435.745 2620.87 3357.07
Miyagawa Kashiwazaki City 435.245 2900.63 3357.07
Radiation dose in Natori 434.640 3310.56
Kami-koubu Matsue City 433.868 2851.54 3357.07
Shimo-Takamachi Kariwa Village 433.192 3200.03 3357.07
Osaka prefectural Sano supporting school Station 432.398 2856.46 3357.07
Arahama Kashiwazaki City 428.874 2988.97 3357.07
Doai Kashiwazaki City 425.681 2812.28 3357.07
Owashi Matsue City 424.452 2787.75 3357.07
Okayasu Maizuru City 422.568 3283.45 3357.07
Katsuyama Kariwa Village 421.280 2988.97 3357.07
Kita-koubu Matsue City 420.683 3057.67 3357.07
Kichisaka Maizuru City 413.065 3990.2 3357.07
Nagai Ohi Town 410.699 2898.44 3348.86
Shiokumi Maizuru City 407.938 4966.91 3357.07
Miyadome Ohi Town 407.831 2404.93 3357.07
Kariwa Kariwa Village 407.617 3096.96 3357.07
Ueno Satsuma-sendai City 394.248 2247.85 3357.07
Power Station-South 389.191 3273.65 3357.07
Radiation dose at JAEA Oarai (P6) 386.963 3310.56
Power Station- 385.546 3195.11 3357.07
Takae Satsuma-sendai City 379.551 2277.3 3357.07
Hokawaduura Genkai Town 378.015 3467.5 3357.07
Kou Itimatsu Suetsugu 377.929 2503.08 3357.07
Minato Satsuma-sendai City 377.656 2085.89 3357.07
Iwanai Iwanai Town 376.336 3398.47 3354.34
Hattari Kyowa Town 373.047 3305.29 3354.34
Chatsu Tomari Village 371.011 3158.17 3354.34
Oyama Maizuru City 358.223 2876.1 3357.07
Kodaira Satsuma-sendai City 355.545 2110.45 3357.07
Kayanuma Tomari Village 354.809 2809.99 3354.34
Anojiri Obama City 353.215 2355.84 3357.07
Kushi Genkai Town 349.738 4785.3 3357.07
Yamaguchi 348.715 3760.13 3348.86
Sadahongou Matsue City 348.228 2930.08 3357.07
Sakibe Karatsu City 347.801 4534.99 3357.07
Hirao Genkai Town 343.814 4780.38 3357.07
The Meteorological Obsevatory of kyowa Town 343.275 3133.66 3354.34
Minami-Horoni Kyowa Town 335.180 2937.49 3354.34
Kounoura Takahama Town 330.353 2483.44 3357.07
Kyoudomarisaki Karatsu City 328.622 4858.92 3357.07
Horikappu Jinja Tomari Village 328.230 3040.47 3354.34
Hukada-kita Matsue City 327.031 2409.82 3357.07
Radiation dose in KEK, Tsukuba 326.240 3329.71
Herokaruusu Tomari Village 324.242 3153.28 3354.34
Yorita Satsuma-sendai City 323.218 2468.71 3357.07
Kamoenai Kamoenai Village 322.032 2662.87 3354.34
Radiation dose in Onagawa (MP-6) 316.267 3307.82
Imamura Genkai Town 314.749 41178 3357.07
Yamanaka Takahama Town 314.185 3204.91 3357.07
Sendai (Miyagi) 312.585 1506.99 3348.86
Radiation dose in Onagawa (MP-1) 300.147 3307.82
Gumisaki Satsuma-sendai City 295.693 1992.66 3357.07
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3329.71
Aomori Aomori City 285.372 2025.34 3354.34
Misawa City hall Misawa City 283.728 3928.1 3354.34
Kashu Ikata Town 277.173 2056.44 3357.07
Noheji Town Office Noheji Town 272.004 1736.02 3354.34
Takasimamati 271.103 2188.96 3357.07
Radiation dose in Onagawa (MP-3) 270.563 3307.82
Kucho Ikata Town 269.545 1815.97 3357.07
Radiation dose in Marumori 269.436 3310.56
Kawanagata Ikata Town 266.821 1771.8 3357.07
Tochigi 260.733 1968.19 3348.86
Chikagawa Mutu City 256.719 2260.73 3354.34
Yokohama Town Office Yokohama Town 254.846 2770.77 3354.34
Tokyo 251.877 2320.7 3348.86
Hiranuma Rokkasho Village 251.186 1819.37 3354.34
Taisei Ikata Town 246.293 1330.08 3357.07
Chitose-daira Rokkasho Village 245.868 1961.61 3354.34
Gifu 243.951 3231.36 3348.86
Fukkoshi Yokohama Town 243.102 1902.76 3354.34
Shimane 240.651 3231.36 3348.86
Sunagomata Higashidoori Village 238.012 2751.14 3354.34
Obuchi Rokkasho Village 237.506 2187.17 3354.34
Tomari Rokkasho Village 230.636 3060.1 3354.34
kanagawa 226.339 2026.94 3348.86
Saitama 219.770 1762.56 3348.86
Ikatagoshi Ikata Town 217.515 1673.62 3357.07
Touhoku Branch office Touhoku Town 215.416 1583.98 3354.34
Radiation dose at Tohoku University 214.824 3310.56
Odanosawa Higashidoori Village 210.287 2192.09 3354.34
Kagawa 205.829 2261.95 3348.86
Oippe Higashidoori Village 205.182 1888.05 3354.34
Oita 200.921 2496.96 3348.86
Touhoku Town office Touhoku Town 200.811 7326.58 3354.34
Kuchogoshi Ikata Town 198.646 1698.18 3357.07
Minatoura Ikata Town 186.776 1526.38 3357.07
Radiation dose in Koyadori, Ojika 184.905 3305.09
Toyama 184.580 4318.27 3348.86
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2082.29 3343.39
Radiation dose in Tukahama, Ojika 183.417 3305.09
Chiba 182.407 1292.54 3348.86
Nara 182.387 2350.08 3348.86
Okayama 181.976 3055.1 3348.86
Yamagata 181.598 2408.83 3348.86
Ehime 180.745 2173.82 3348.86
Ishikawa 180.445 3745.44 3348.86
Niigata 177.483 4494.53 3348.86
Hiroshima 176.816 2026.94 3348.86
Mie 174.867 2317.77 3348.86
Fukui 170.045 2849.47 3348.86
Radiation dose in Terama, Ojika 168.036 3305.09
Yamanashi 164.561 1880.06 3348.86
Nagano 162.242 2861.22 3348.86
Saga 161.421 2526.34 3348.86
Tottori 161.392 2320.7 3348.86
Radiation dose in Enoshima, Ojika 160.091 3305.09
Osaka 159.103 1791.94 3348.86
Ibaraki-city Environment 157.249 3264.05
Aichi 149.345 2173.82 3348.86
Toyonoura Ikata Town 149.214 1752.16 3357.07
Shizuoka 148.639 2247.26 3348.86
Kyoto 144.522 2555.71 3348.86
Kagoshima 144.449 2770.16 3348.86
Tokushima 143.627 1968.19 3348.86
Gunma 143.572 1321.92 3348.86
Hyogo 139.710 2232.58 3348.86
Fukuoka 136.511 2320.7 3348.86
Wakayama 133.857 1645.06 3348.86
Radiation at Tamaki-cho Mie Japan 133.138 3264.05
Akita 132.832 2526.34 3348.86
Shiga 124.919 1791.94 3348.86
Nagasaki 109.459 2026.94 3348.86
Hokkaido 109.189 3084.48 3348.86
Kumamoto 103.568 1968.19 3348.86
Aomori 101.819 2996.35 3348.86
Miyazaki 100.354 1950.57 3348.86
Kochi 95.931 2232.58 3348.86
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2073.77 3329.71
Iwate 90.324 2467.58 3348.86
Environment Feeds from Ohta 83.623 3264.05
Okinawa 82.305 1689.12 3348.86
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