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Accumulated absorbed dose rate - T=13.03.2011 - 22.10.2014(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 3523.97
Fukushima I MP8 570942.000 3523.97
Fukushima I MP6 240668.000 3523.97
Yamada Futaba Town 176983.000 2585.3 3080.74
Fukushima I MP2 140420.000 3523.97
Fukushima I MP5 111325.000 3523.97
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2239.06 3595.1
Fukushima I MP3 93730.602 3523.97
Fukushima I MP4 86821.500 3523.97
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2239.06 3595.1
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2187.94 3513.02
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2239.06 3595.1
Ono Okuma Town 38610.500 2387.11 3080.74
Shinzan Futaba Town 38332.801 2166.43 3080.74
Fukushima I MP1 31496.801 3523.97
Yonomori Tomioka Town 29815.900 2468.18 3080.74
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2239.06 3595.1
Tomioka Tomioka Town 25324.500 2657.35 3080.74
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2239.06 3595.1
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2239.06 3595.1
Shimo-Kooriyama Tomioka Town 13057.000 2639.35 3080.74
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2239.06 3595.1
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2239.06 3595.1
Kami-kooriyama Tomioka Town 11803.900 2071.85 3080.74
Fukushima II MP3 11060.600 3523.97
Fukushima II MP1 10903.000 3523.97
Kooriyama Futaba Town 10352.900 2414.14 3080.74
Fukushima II MP4 9696.330 3523.97
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2235.65 3589.63
Fukushima II MP5 9382.150 3523.97
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2239.06 3595.1
Matsudate Naraha Town 8410.890 2819.49 3080.74
Shigeoka Naraha Town 8115.970 3116.76 3080.74
Fukushima II MP2 7875.320 3523.97
Namie Namie Town 7321.210 2274.53 3080.74
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3540.38
Fukushima II MP6 7062.690 3523.97
Fukushima II MP7 6511.580 3521.23
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2239.06 3595.1
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2239.06 3595.1
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2239.06 3595.1
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2239.06 3595.1
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2239.06 3595.1
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2239.06 3595.1
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2233.94 3586.9
Futatsunuma Hirono Town 3520.340 2702.4 3080.74
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2239.06 3595.1
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2239.06 3595.1
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3537.65
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2239.06 3595.1
Kiyohashi Namie Town 3162.000 1995.26 3080.74
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2233.94 3586.9
Radiation dose at Agricultural center, Koriyama 3128.960 3537.65
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2239.06 3595.1
Radiation dose at Koriyama city office, Koriyama 2803.520 3537.65
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2239.06 3595.1
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2233.94 3586.9
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2239.06 3595.1
Yamadaoka Naraha Town 2205.340 2396.14 3080.74
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3540.38
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2239.06 3595.1
Kuji Hitachi City 1990.890 5567.23 3606.05
Hitachinaka Hitachinaka City 1951.950 2444.34 3603.31
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2233.94 3586.9
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2233.94 3586.9
Momiyama Hokota City 1837.540 2788.9 3606.05
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2233.94 3586.9
Horiguchi Hitachinaka City 1779.410 2437.51 3608.78
Onuma Hitachi City 1776.950 2075.6 3603.31
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2239.06 3595.1
Tsukuriya Hokota City 1736.890 2346.05 3606.05
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3537.65
Nemoto Hitachioomiya City 1633.190 2612.94 3603.31
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2239.06 3595.1
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2239.06 3595.1
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3545.86
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2239.06 3595.1
Radiation dose at JAEA Oarai (P12) 1512.140 3562.27
Radiation dose at Ose administration center, Koriyama 1494.270 3537.65
Araji Hokota City 1437.760 2351.3 3606.05
Ishigami Tokai Village 1431.690 2140.44 3606.05
Mawatari Hitachinaka City 1422.870 2472.58 3606.05
Radiation dose at JAEA Oarai (P11) 1399.370 3562.27
Onuki Oarai Town 1387.990 2567.47 3606.05
Sawa Hitachinaka City 1353.770 1938.61 3603.31
Toyooka Tokai Village 1321.760 2356.58 3606.05
Ajigaura Hitachinaka City 1313.890 2317.91 3603.31
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2239.06 3595.1
Geiger Counter Feeds from Asao Kawasaki 1266.620 3515.76
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3537.65
Isohama Oarai Town 1250.540 2237.19 3600.58
Ebisawa Ibaraki Town 1222.240 6075.06 3603.31
Muramatsu Tokai Village 1203.520 2377.68 3606.05
Kamitoda Hokota City 1184.740 1950.65 3606.05
Yanagisawa Hitachinaka City 1166.970 1986.03 3603.31
Tokushuku Hokota City 1159.730 1760.86 3606.05
Tasaki Hokota City 1153.300 2075.53 3575.95
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2239.06 3595.1
Kadobe Naka City 1086.580 4730.67 3603.31
Radiation dose at Date city office, Date 1076.050 3540.38
Oshinobe Tokai Village 1041.340 2219.52 3606.05
Oba Mito City 1037.670 7291.18 3606.05
Godai Naka City 1031.270 1924.27 3606.05
Ishikawa Mito City 1030.810 2268.69 3608.78
Isobe Hitachiota City 1013.130 10944.7 3606.05
Yatabe Ibaraki Town 996.127 1903.2 3606.05
Radiation dose at Motomiya city office, Motomiya 992.703 3540.38
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2233.94 3586.9
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2233.94 3586.9
Yokobori Naka City 930.280 2230.06 3606.05
Sugaya Naka City 926.186 3408.31 3608.78
Kounosu Naka City 926.087 1739.76 3606.05
Funaishikawa Tokai Village 900.399 2309.14 3606.05
Nukada Naka City 899.900 2084.54 3600.58
Uridura Naka City 890.113 1989.79 3600.58
Shiraki Tsuruga City 881.330 4226.08 3608.78
Motokomezaki Naka City 880.851 1849.3 3573.22
Shiraki pass Tsuruga City 850.284 4426.55 3608.78
Radiation dose in Yamamoto 846.633 3562.27
Yoshizawa Mito City 837.646 2013.91 3606.05
Radiation dose at JAEA Oarai (P7) 831.135 3562.27
Mayumi Hitachiota City 828.119 1998.1 3606.05
Urasoko Tsuruga City 826.465 3508.53 3608.78
Nemoto Hitachioomiya City 825.588 2249.45 3603.31
Takenami Mihama Town 804.283 3682.64 3608.78
Radiation dose at JAEA Oarai (P15) 780.207 3562.27
Tateishi Tsuruga City 780.092 2917.64 3608.78
Radiation dose at JAEA Oarai (P14) 770.174 3562.27
Radiation dose at JAEA Oarai (P13) 769.612 3562.27
Ukishima Kawasaki Ward 735.475 6885.18 3608.78
Kume Hitachiota City 713.958 1955.9 3606.05
Radiation dose at JAEA Oarai (P2) 712.011 3562.27
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2233.94 3586.9
Nyuu Mihama Town 674.787 3355.54 3608.78
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2239.06 3595.1
Radiation dose in Iwanuma 670.242 3562.27
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2239.06 3595.1
Tsuruga Tsuruga City 655.360 2959.84 3608.78
Shiohama Kawasaki Ward 653.536 2363.66 3608.78
Radiation dose in Kakuda 649.863 3562.27
Sakajiri Mihama Town 649.252 3914.8 3608.78
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2458.63 3608.78
Radiation dose in Onagawa (MP-2) 632.968 3559.54
Kumatori town Nishi primary school Station 631.491 2938.72 3608.78
Oshima Kawasaki Ward 630.402 2252.86 3608.78
Izumisano municipal Oike athletic field Station 629.920 3313.34 3608.78
Atom-kyoudou nursery school Station 625.566 3181.43 3608.78
South point of Kinki University Atomic Energy Research Instirute Station 625.202 2896.52 3608.78
Nakamachi Omaezaki City 623.494 3730.12 3608.78
Uraga Yokosuka City 622.492 1767.45 3608.78
Goritoge Shika Town 622.143 3962.29 3608.78
Kumatori town Minami primary school Station 606.134 3371.36 3608.78
Radiation dose at JAEA Oarai (P1) 603.643 3565.01
Yamanotedai-No.1 Park Station 599.140 3144.49 3608.78
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3581.42
Noumi Shika Town 594.021 3920.06 3608.78
Radiation dose in Watari 591.851 3562.27
Hairando Yokosuka City 588.667 2215.92 3608.78
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2239.06 3595.1
Ningyotoge Kagamino Town 574.857 3144.49 3608.78
Ten-no Kagamino Town 569.960 3767.06 3608.78
Funagura Yokosuka City 563.909 2089.3 3608.78
Chidori Kawasaki Ward 560.211 2020.7 3608.78
Radiation dose at JAEA Oarai (P16) 556.365 3562.27
Shika Shika Town 551.376 3777.61 3608.78
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2453.34 3608.78
Sahara Yokosuka City 547.404 1957.39 3608.78
Kazanashi Shika Town 545.377 3545.47 3608.78
Akasumi Shika Town 544.970 3244.74 3608.78
Kurahashi Maizuru City 540.820 2954.55 3608.78
Obama Obama City 540.809 2643.28 3608.78
Sakuragaike community hall Omaezaki City 540.772 3825.09 3608.78
Shirowa primary school Omaezaki City 535.692 3745.95 3608.78
Radiation dose at JAEA Oarai (P5) 529.759 3562.27
Uenohara Omaezaki City 529.333 3851.49 3608.78
Kumano Shika Town 529.019 3677.38 3608.78
Izumisano municipal Hineno filtration plant Station 527.471 3170.89 3608.78
Nishi-hamasada Matsue City 525.089 3503.09 3592.37
Kouno Minami-Echizen Town 525.028 2659.1 3608.78
Kurihama Yokosuka City 523.708 2115.67 3608.78
Osaka prefectural Kumatori off-site-center Station 522.808 2922.89 3608.78
Ogasa branch Kikugawa City 522.039 3889.43 3595.1
Izumisano municipal Hineno primary scool Station 518.181 2537.77 3608.78
Shirasuna Omaezaki City 499.479 3772.35 3608.78
Jitougata primary school Makinohara City 498.059 3619.33 3608.78
Kataku Matsue City 497.007 2812.1 3608.78
Nishihemi Yokosuka City 496.917 1688.31 3608.78
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3581.42
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 2769.9 3608.78
Otomi Takahama Town 494.821 3102.29 3608.78
Otsu Nanao City 493.895 3112.83 3608.78
The Observation point for comparison Tatsunokuchi 493.454 2564.14 3608.78
Hitsuhama Ohi Town 492.630 2885.98 3608.78
Kijiyama Misasa Town 489.284 2928.18 3608.78
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3581.42
Hiraba Omaezaki City 485.878 3772.35 3608.78
Tayu Matsue City 484.956 2933.47 3608.78
Hamaokakita primary school Omaezaki City 484.537 3863.16 3595.1
Oitomi Ayabe City 474.670 3719.58 3608.78
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3581.42
Kashiwazaki-shigai Kashiwazaki City 470.822 2959.84 3608.78
Mitsu Matsue City 466.897 2806.84 3608.78
Tonomachi Kawasaki Ward 463.967 3556.01 3608.78
Daitou branch Kakegawa City 463.829 3805.35 3595.1
Fukura Shika Town 462.493 3540.19 3608.78
Nagasawa Yokosuka City 462.365 2068.18 3608.78
The athletic field Station of Kinki University 461.661 2337.26 3608.78
Koura Matsue City 461.049 3350.25 3608.78
Sakurasan Ward Omaezaki City 459.434 3650.98 3608.78
Tsuchikawa Nanao City 458.915 3445.22 3608.78
Kumatori Town office Station 457.917 2411.14 3608.78
Shinkango Omaezaki City 449.013 4226.08 3608.78
Ogurui Takahama Town 448.279 2764.61 3608.78
Kusabue Omaezaki City 444.162 3983.37 3608.78
Omaezaki City monitoring center 443.946 3909.52 3608.78
Akawase Kagamino Town 442.246 2411.14 3608.78
Ibaraki 442.139 1768.7 3600.58
Hinode Town Yokosuka City 438.324 1392.86 3608.78
Nishiyama Kashiwazaki City 437.251 4189.13 3608.78
Kariwa Kariwa Village 436.307 3160.31 3608.78
Osaka prefectural Hineno high scool Station 435.745 2817.38 3608.78
Miyagawa Kashiwazaki City 435.245 3118.12 3608.78
Radiation dose in Natori 434.640 3562.27
Kami-koubu Matsue City 433.868 3065.35 3608.78
Shimo-Takamachi Kariwa Village 433.192 3439.96 3608.78
Osaka prefectural Sano supporting school Station 432.398 3070.63 3608.78
Arahama Kashiwazaki City 428.874 3213.08 3608.78
Doai Kashiwazaki City 425.681 3023.15 3608.78
Owashi Matsue City 424.452 2996.78 3608.78
Okayasu Maizuru City 422.568 3529.64 3608.78
Katsuyama Kariwa Village 421.280 3213.08 3608.78
Kita-koubu Matsue City 420.683 3286.94 3608.78
Kichisaka Maizuru City 413.065 4289.39 3608.78
Nagai Ohi Town 410.699 3116.3 3600.58
Shiokumi Maizuru City 407.938 5339.32 3608.78
Miyadome Ohi Town 407.831 2585.25 3608.78
Kariwa Kariwa Village 407.617 3329.17 3608.78
Ueno Satsuma-sendai City 394.248 2416.4 3608.78
Power Station-South 389.191 3519.1 3608.78
Radiation dose at JAEA Oarai (P6) 386.963 3562.27
Power Station- 385.546 3434.68 3608.78
Takae Satsuma-sendai City 379.551 2448.05 3608.78
Hokawaduura Genkai Town 378.015 3727.49 3608.78
Kou Itimatsu Suetsugu 377.929 2690.76 3608.78
Minato Satsuma-sendai City 377.656 2242.29 3608.78
Iwanai Iwanai Town 376.336 3653.5 3606.05
Hattari Kyowa Town 373.047 3553.32 3606.05
Chatsu Tomari Village 371.011 3395.16 3606.05
Oyama Maizuru City 358.223 3091.75 3608.78
Kodaira Satsuma-sendai City 355.545 2268.69 3608.78
Kayanuma Tomari Village 354.809 3020.86 3606.05
Anojiri Obama City 353.215 2532.48 3608.78
Kushi Genkai Town 349.738 5144.1 3608.78
Yamaguchi 348.715 4042.75 3600.58
Sadahongou Matsue City 348.228 3149.77 3608.78
Sakibe Karatsu City 347.801 4875.02 3608.78
Hirao Genkai Town 343.814 5138.81 3608.78
The Meteorological Obsevatory of kyowa Town 343.275 3368.81 3606.05
Minami-Horoni Kyowa Town 335.180 3157.92 3606.05
Kounoura Takahama Town 330.353 2669.65 3608.78
Kyoudomarisaki Karatsu City 328.622 5223.24 3608.78
Horikappu Jinja Tomari Village 328.230 3268.63 3606.05
Hukada-kita Matsue City 327.031 2590.51 3608.78
Radiation dose in KEK, Tsukuba 326.240 3581.42
Herokaruusu Tomari Village 324.242 3389.91 3606.05
Yorita Satsuma-sendai City 323.218 2653.82 3608.78
Kamoenai Kamoenai Village 322.032 2862.7 3606.05
Radiation dose in Onagawa (MP-6) 316.267 3559.54
Imamura Genkai Town 314.749 44265.5 3608.78
Yamanaka Takahama Town 314.185 3445.22 3608.78
Sendai (Miyagi) 312.585 1620.26 3600.58
Radiation dose in Onagawa (MP-1) 300.147 3559.54
Gumisaki Satsuma-sendai City 295.693 2142.07 3608.78
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3581.42
Aomori Aomori City 285.372 2177.33 3606.05
Misawa City hall Misawa City 283.728 4222.87 3606.05
Kashu Ikata Town 277.173 2210.63 3608.78
Noheji Town Office Noheji Town 272.004 1866.29 3606.05
Takasimamati 271.103 2353.09 3608.78
Radiation dose in Onagawa (MP-3) 270.563 3559.54
Kucho Ikata Town 269.545 1952.13 3608.78
Radiation dose in Marumori 269.436 3562.27
Kawanagata Ikata Town 266.821 1904.65 3608.78
Tochigi 260.733 2116.13 3600.58
Chikagawa Mutu City 256.719 2430.38 3606.05
Yokohama Town Office Yokohama Town 254.846 2978.69 3606.05
Tokyo 251.877 2495.14 3600.58
Hiranuma Rokkasho Village 251.186 1955.9 3606.05
Taisei Ikata Town 246.293 1429.81 3608.78
Chitose-daira Rokkasho Village 245.868 2108.81 3606.05
Gifu 243.951 3474.24 3600.58
Fukkoshi Yokohama Town 243.102 2045.55 3606.05
Shimane 240.651 3474.24 3600.58
Sunagomata Higashidoori Village 238.012 2957.59 3606.05
Obuchi Rokkasho Village 237.506 2351.3 3606.05
Tomari Rokkasho Village 230.636 3289.73 3606.05
kanagawa 226.339 2179.3 3600.58
Saitama 219.770 1895.04 3600.58
Ikatagoshi Ikata Town 217.515 1799.11 3608.78
Touhoku Branch office Touhoku Town 215.416 1702.85 3606.05
Radiation dose at Tohoku University 214.824 3562.27
Odanosawa Higashidoori Village 210.287 2356.58 3606.05
Kagawa 205.829 2431.97 3600.58
Oippe Higashidoori Village 205.182 2029.73 3606.05
Oita 200.921 2684.64 3600.58
Touhoku Town office Touhoku Town 200.811 7876.37 3606.05
Kuchogoshi Ikata Town 198.646 1825.51 3608.78
Minatoura Ikata Town 186.776 1640.83 3608.78
Radiation dose in Koyadori, Ojika 184.905 3556.8
Toyama 184.580 4642.85 3600.58
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2239.06 3595.1
Radiation dose in Tukahama, Ojika 183.417 3556.8
Chiba 182.407 1389.7 3600.58
Nara 182.387 2526.72 3600.58
Okayama 181.976 3284.74 3600.58
Yamagata 181.598 2589.89 3600.58
Ehime 180.745 2337.22 3600.58
Ishikawa 180.445 4026.96 3600.58
Niigata 177.483 4832.35 3600.58
Hiroshima 176.816 2179.3 3600.58
Mie 174.867 2491.98 3600.58
Fukui 170.045 3063.65 3600.58
Radiation dose in Terama, Ojika 168.036 3556.8
Yamanashi 164.561 2021.38 3600.58
Nagano 162.242 3076.28 3600.58
Saga 161.421 2716.22 3600.58
Tottori 161.392 2495.14 3600.58
Radiation dose in Enoshima, Ojika 160.091 3556.8
Osaka 159.103 1926.62 3600.58
Ibaraki-city Environment 157.249 3515.76
Aichi 149.345 2337.22 3600.58
Toyonoura Ikata Town 149.214 1883.53 3608.78
Shizuoka 148.639 2416.18 3600.58
Kyoto 144.522 2747.81 3600.58
Kagoshima 144.449 2978.37 3600.58
Tokushima 143.627 2116.13 3600.58
Gunma 143.572 1421.28 3600.58
Hyogo 139.710 2400.38 3600.58
Fukuoka 136.511 2495.14 3600.58
Wakayama 133.857 1768.7 3600.58
Radiation at Tamaki-cho Mie Japan 133.138 3515.76
Akita 132.832 2716.22 3600.58
Shiga 124.919 1926.62 3600.58
Nagasaki 109.459 2179.3 3600.58
Hokkaido 109.189 3316.32 3600.58
Kumamoto 103.568 2116.13 3600.58
Aomori 101.819 3221.57 3600.58
Miyazaki 100.354 2097.18 3600.58
Kochi 95.931 2400.38 3600.58
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2230.54 3581.42
Iwate 90.324 2653.06 3600.58
Environment Feeds from Ohta 83.623 3515.76
Okinawa 82.305 1816.08 3600.58
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