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Accumulated absorbed dose rate - T=13.03.2011 - 03.03.2015(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 3885.12
Fukushima I MP8 570942.000 3885.12
Fukushima I MP6 240668.000 3885.12
Yamada Futaba Town 176983.000 2888.38 3441.89
Fukushima I MP2 140420.000 3885.12
Fukushima I MP5 111325.000 3885.12
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 2463.98 3956.26
Fukushima I MP3 93730.602 3885.12
Fukushima I MP4 86821.500 3885.12
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 2463.98 3956.26
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 2412.86 3874.18
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 2463.98 3956.26
Ono Okuma Town 38610.500 2666.95 3441.89
Shinzan Futaba Town 38332.801 2420.4 3441.89
Fukushima I MP1 31496.801 3885.12
Yonomori Tomioka Town 29815.900 2757.53 3441.89
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 2463.98 3956.26
Tomioka Tomioka Town 25324.500 2968.87 3441.89
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 2463.98 3956.26
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 2463.98 3956.26
Shimo-Kooriyama Tomioka Town 13057.000 2948.76 3441.89
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 2463.98 3956.26
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 2463.98 3956.26
Kami-kooriyama Tomioka Town 11803.900 2314.73 3441.89
Fukushima II MP3 11060.600 3885.12
Fukushima II MP1 10903.000 3885.12
Kooriyama Futaba Town 10352.900 2697.14 3441.89
Fukushima II MP4 9696.330 3885.12
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 2460.58 3950.78
Fukushima II MP5 9382.150 3885.12
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 2463.98 3956.26
Matsudate Naraha Town 8410.890 3150.02 3441.89
Shigeoka Naraha Town 8115.970 3482.13 3441.89
Fukushima II MP2 7875.320 3885.12
Namie Namie Town 7321.210 2541.17 3441.89
Radiation dose at Shirasawa branch office, Motomiya 7287.920 3901.54
Fukushima II MP6 7062.690 3885.12
Fukushima II MP7 6511.580 3882.38
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 2463.98 3956.26
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 2463.98 3956.26
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 2463.98 3956.26
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 2463.98 3956.26
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 2463.98 3956.26
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 2463.98 3956.26
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 2458.87 3948.05
Futatsunuma Hirono Town 3520.340 3019.2 3441.89
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 2463.98 3956.26
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 2463.98 3956.26
Radiation dose at Koriyama joint government building, Koriyama 3232.890 3898.8
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 2463.98 3956.26
Kiyohashi Namie Town 3162.000 2229.17 3441.89
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 2458.87 3948.05
Radiation dose at Agricultural center, Koriyama 3128.960 3898.8
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 2463.98 3956.26
Radiation dose at Koriyama city office, Koriyama 2803.520 3898.8
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 2463.98 3956.26
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 2458.87 3948.05
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 2463.98 3956.26
Yamadaoka Naraha Town 2205.340 2677.03 3441.89
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 3901.54
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 2463.98 3956.26
Kuji Hitachi City 1990.890 6124.8 3967.2
Hitachinaka Hitachinaka City 1951.950 2689.33 3964.46
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 2458.87 3948.05
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 2458.87 3948.05
Momiyama Hokota City 1837.540 3068.21 3967.2
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 2458.87 3948.05
Horiguchi Hitachinaka City 1779.410 2681.45 3969.94
Onuma Hitachi City 1776.950 2283.64 3964.46
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 2463.98 3956.26
Tsukuriya Hokota City 1736.890 2581.01 3967.2
Radiation dose at Big palette Fukushima, Koriyama 1668.540 3898.8
Nemoto Hitachioomiya City 1633.190 2874.83 3964.46
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 2463.98 3956.26
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 2463.98 3956.26
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 3907.01
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 2463.98 3956.26
Radiation dose at JAEA Oarai (P12) 1512.140 3923.42
Radiation dose at Ose administration center, Koriyama 1494.270 3898.8
Araji Hokota City 1437.760 2586.79 3967.2
Ishigami Tokai Village 1431.690 2354.81 3967.2
Mawatari Hitachinaka City 1422.870 2720.21 3967.2
Radiation dose at JAEA Oarai (P11) 1399.370 3923.42
Onuki Oarai Town 1387.990 2824.61 3967.2
Sawa Hitachinaka City 1353.770 2132.92 3964.46
Toyooka Tokai Village 1321.760 2592.6 3967.2
Ajigaura Hitachinaka City 1313.890 2550.23 3964.46
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 2463.98 3956.26
Geiger Counter Feeds from Asao Kawasaki 1266.620 3876.91
Radiation dose at Tamokami elementary school, Koriyama 1256.140 3898.8
Isohama Oarai Town 1250.540 2461.59 3961.73
Ebisawa Ibaraki Town 1222.240 6683.95 3964.46
Muramatsu Tokai Village 1203.520 2615.81 3967.2
Kamitoda Hokota City 1184.740 2146.01 3967.2
Yanagisawa Hitachinaka City 1166.970 2185.08 3964.46
Tokushuku Hokota City 1159.730 1937.21 3967.2
Tasaki Hokota City 1153.300 2285.14 3937.1
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 2463.98 3956.26
Kadobe Naka City 1086.580 5204.82 3964.46
Radiation dose at Date city office, Date 1076.050 3901.54
Oshinobe Tokai Village 1041.340 2441.81 3967.2
Oba Mito City 1037.670 8021.4 3967.2
Godai Naka City 1031.270 2116.99 3967.2
Ishikawa Mito City 1030.810 2495.73 3969.94
Isobe Hitachiota City 1013.130 12040.8 3967.2
Yatabe Ibaraki Town 996.127 2093.81 3967.2
Radiation dose at Motomiya city office, Motomiya 992.703 3901.54
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 2458.87 3948.05
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 2458.87 3948.05
Yokobori Naka City 930.280 2453.4 3967.2
Sugaya Naka City 926.186 3749.4 3969.94
Kounosu Naka City 926.087 1914 3967.2
Funaishikawa Tokai Village 900.399 2540.4 3967.2
Nukada Naka City 899.900 2293.63 3961.73
Uridura Naka City 890.113 2189.38 3961.73
Shiraki Tsuruga City 881.330 4649 3969.94
Motokomezaki Naka City 880.851 2036.21 3934.37
Shiraki pass Tsuruga City 850.284 4869.54 3969.94
Radiation dose in Yamamoto 846.633 3923.42
Yoshizawa Mito City 837.646 2215.61 3967.2
Radiation dose at JAEA Oarai (P7) 831.135 3923.42
Mayumi Hitachiota City 828.119 2198.21 3967.2
Urasoko Tsuruga City 826.465 3859.65 3969.94
Nemoto Hitachioomiya City 825.588 2474.9 3964.46
Takenami Mihama Town 804.283 4051.18 3969.94
Radiation dose at JAEA Oarai (P15) 780.207 3923.42
Tateishi Tsuruga City 780.092 3209.62 3969.94
Radiation dose at JAEA Oarai (P14) 770.174 3923.42
Radiation dose at JAEA Oarai (P13) 769.612 3923.42
Ukishima Kawasaki Ward 735.475 7574.22 3969.94
Kume Hitachiota City 713.958 2151.79 3967.2
Radiation dose at JAEA Oarai (P2) 712.011 3923.42
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 2458.87 3948.05
Nyuu Mihama Town 674.787 3691.34 3969.94
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 2463.98 3956.26
Radiation dose in Iwanuma 670.242 3923.42
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 2463.98 3956.26
Tsuruga Tsuruga City 655.360 3256.04 3969.94
Shiohama Kawasaki Ward 653.536 2600.2 3969.94
Radiation dose in Kakuda 649.863 3923.42
Sakajiri Mihama Town 649.252 4306.58 3969.94
North point of Kinki University Atomic Energy Research Instirute Station 639.566 2704.68 3969.94
Radiation dose in Onagawa (MP-2) 632.968 3920.69
Kumatori town Nishi primary school Station 631.491 3232.82 3969.94
Oshima Kawasaki Ward 630.402 2478.32 3969.94
Izumisano municipal Oike athletic field Station 629.920 3644.92 3969.94
Atom-kyoudou nursery school Station 625.566 3499.81 3969.94
South point of Kinki University Atomic Energy Research Instirute Station 625.202 3186.4 3969.94
Nakamachi Omaezaki City 623.494 4103.42 3969.94
Uraga Yokosuka City 622.492 1944.33 3969.94
Goritoge Shika Town 622.143 4358.82 3969.94
Kumatori town Minami primary school Station 606.134 3708.76 3969.94
Radiation dose at JAEA Oarai (P1) 603.643 3926.16
Yamanotedai-No.1 Park Station 599.140 3459.17 3969.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 3942.58
Noumi Shika Town 594.021 4312.36 3969.94
Radiation dose in Watari 591.851 3923.42
Hairando Yokosuka City 588.667 2437.68 3969.94
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 2463.98 3956.26
Ningyotoge Kagamino Town 574.857 3459.17 3969.94
Ten-no Kagamino Town 569.960 4144.06 3969.94
Funagura Yokosuka City 563.909 2298.38 3969.94
Chidori Kawasaki Ward 560.211 2222.92 3969.94
Radiation dose at JAEA Oarai (P16) 556.365 3923.42
Shika Shika Town 551.376 4155.65 3969.94
Higashiosaka municipal Kamikosaka primary scool Station 550.277 2698.86 3969.94
Sahara Yokosuka City 547.404 2153.27 3969.94
Kazanashi Shika Town 545.377 3900.29 3969.94
Akasumi Shika Town 544.970 3569.46 3969.94
Kurahashi Maizuru City 540.820 3250.23 3969.94
Obama Obama City 540.809 2907.8 3969.94
Sakuragaike community hall Omaezaki City 540.772 4207.89 3969.94
Shirowa primary school Omaezaki City 535.692 4120.83 3969.94
Radiation dose at JAEA Oarai (P5) 529.759 3923.42
Uenohara Omaezaki City 529.333 4236.93 3969.94
Kumano Shika Town 529.019 4045.4 3969.94
Izumisano municipal Hineno filtration plant Station 527.471 3488.22 3969.94
Nishi-hamasada Matsue City 525.089 3855.27 3953.52
Kouno Minami-Echizen Town 525.028 2925.22 3969.94
Kurihama Yokosuka City 523.708 2327.39 3969.94
Osaka prefectural Kumatori off-site-center Station 522.808 3215.4 3969.94
Ogasa branch Kikugawa City 522.039 4280.15 3956.26
Izumisano municipal Hineno primary scool Station 518.181 2791.74 3969.94
Shirasuna Omaezaki City 499.479 4149.87 3969.94
Jitougata primary school Makinohara City 498.059 3981.53 3969.94
Kataku Matsue City 497.007 3093.52 3969.94
Nishihemi Yokosuka City 496.917 1857.27 3969.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 3942.58
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 3047.1 3969.94
Otomi Takahama Town 494.821 3412.75 3969.94
Otsu Nanao City 493.895 3424.35 3969.94
The Observation point for comparison Tatsunokuchi 493.454 2820.74 3969.94
Hitsuhama Ohi Town 492.630 3174.8 3969.94
Kijiyama Misasa Town 489.284 3221.22 3969.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 3942.58
Hiraba Omaezaki City 485.878 4149.87 3969.94
Tayu Matsue City 484.956 3227.04 3969.94
Hamaokakita primary school Omaezaki City 484.537 4251.24 3956.26
Oitomi Ayabe City 474.670 4091.82 3969.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 3942.58
Kashiwazaki-shigai Kashiwazaki City 470.822 3256.04 3969.94
Mitsu Matsue City 466.897 3087.74 3969.94
Tonomachi Kawasaki Ward 463.967 3911.88 3969.94
Daitou branch Kakegawa City 463.829 4187.63 3956.26
Fukura Shika Town 462.493 3894.47 3969.94
Nagasawa Yokosuka City 462.365 2275.16 3969.94
The athletic field Station of Kinki University 461.661 2571.16 3969.94
Koura Matsue City 461.049 3685.53 3969.94
Sakurasan Ward Omaezaki City 459.434 4016.36 3969.94
Tsuchikawa Nanao City 458.915 3790 3969.94
Kumatori Town office Station 457.917 2652.44 3969.94
Shinkango Omaezaki City 449.013 4649 3969.94
Ogurui Takahama Town 448.279 3041.28 3969.94
Kusabue Omaezaki City 444.162 4382.01 3969.94
Omaezaki City monitoring center 443.946 4300.76 3969.94
Akawase Kagamino Town 442.246 2652.44 3969.94
Ibaraki 442.139 1946.11 3961.73
Hinode Town Yokosuka City 438.324 1532.26 3969.94
Nishiyama Kashiwazaki City 437.251 4608.36 3969.94
Kariwa Kariwa Village 436.307 3476.58 3969.94
Osaka prefectural Hineno high scool Station 435.745 3099.34 3969.94
Miyagawa Kashiwazaki City 435.245 3430.16 3969.94
Radiation dose in Natori 434.640 3923.42
Kami-koubu Matsue City 433.868 3372.11 3969.94
Shimo-Takamachi Kariwa Village 433.192 3784.22 3969.94
Osaka prefectural Sano supporting school Station 432.398 3377.93 3969.94
Arahama Kashiwazaki City 428.874 3534.64 3969.94
Doai Kashiwazaki City 425.681 3325.69 3969.94
Owashi Matsue City 424.452 3296.68 3969.94
Okayasu Maizuru City 422.568 3882.88 3969.94
Katsuyama Kariwa Village 421.280 3534.64 3969.94
Kita-koubu Matsue City 420.683 3615.88 3969.94
Kichisaka Maizuru City 413.065 4718.65 3969.94
Nagai Ohi Town 410.699 3428.88 3961.73
Shiokumi Maizuru City 407.938 5873.66 3969.94
Miyadome Ohi Town 407.831 2843.97 3969.94
Kariwa Kariwa Village 407.617 3662.34 3969.94
Ueno Satsuma-sendai City 394.248 2658.22 3969.94
Power Station-South 389.191 3871.28 3969.94
Radiation dose at JAEA Oarai (P6) 386.963 3923.42
Power Station- 385.546 3778.4 3969.94
Takae Satsuma-sendai City 379.551 2693.04 3969.94
Hokawaduura Genkai Town 378.015 4100.53 3969.94
Kou Itimatsu Suetsugu 377.929 2960.04 3969.94
Minato Satsuma-sendai City 377.656 2466.69 3969.94
Iwanai Iwanai Town 376.336 4019.4 3967.2
Hattari Kyowa Town 373.047 3909.19 3967.2
Chatsu Tomari Village 371.011 3735.19 3967.2
Oyama Maizuru City 358.223 3401.16 3969.94
Kodaira Satsuma-sendai City 355.545 2495.73 3969.94
Kayanuma Tomari Village 354.809 3323.4 3967.2
Anojiri Obama City 353.215 2785.92 3969.94
Kushi Genkai Town 349.738 5658.9 3969.94
Yamaguchi 348.715 4448.26 3961.73
Sadahongou Matsue City 348.228 3464.99 3969.94
Sakibe Karatsu City 347.801 5362.9 3969.94
Hirao Genkai Town 343.814 5653.08 3969.94
The Meteorological Obsevatory of kyowa Town 343.275 3706.2 3967.2
Minami-Horoni Kyowa Town 335.180 3474.19 3967.2
Kounoura Takahama Town 330.353 2936.81 3969.94
Kyoudomarisaki Karatsu City 328.622 5745.96 3969.94
Horikappu Jinja Tomari Village 328.230 3595.99 3967.2
Hukada-kita Matsue City 327.031 2849.75 3969.94
Radiation dose in KEK, Tsukuba 326.240 3942.58
Herokaruusu Tomari Village 324.242 3729.41 3967.2
Yorita Satsuma-sendai City 323.218 2919.4 3969.94
Kamoenai Kamoenai Village 322.032 3149.4 3967.2
Radiation dose in Onagawa (MP-6) 316.267 3920.69
Imamura Genkai Town 314.749 48695.4 3969.94
Yamanaka Takahama Town 314.185 3790 3969.94
Sendai (Miyagi) 312.585 1782.78 3961.73
Radiation dose in Onagawa (MP-1) 300.147 3920.69
Gumisaki Satsuma-sendai City 295.693 2356.44 3969.94
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 3942.58
Aomori Aomori City 285.372 2395.39 3967.2
Misawa City hall Misawa City 283.728 4645.8 3967.2
Kashu Ikata Town 277.173 2431.86 3969.94
Noheji Town Office Noheji Town 272.004 2053.2 3967.2
Takasimamati 271.103 2588.57 3969.94
Radiation dose in Onagawa (MP-3) 270.563 3920.69
Kucho Ikata Town 269.545 2147.49 3969.94
Radiation dose in Marumori 269.436 3923.42
Kawanagata Ikata Town 266.821 2095.26 3969.94
Tochigi 260.733 2328.38 3961.73
Chikagawa Mutu City 256.719 2673.79 3967.2
Yokohama Town Office Yokohama Town 254.846 3277.01 3967.2
Tokyo 251.877 2745.41 3961.73
Hiranuma Rokkasho Village 251.186 2151.79 3967.2
Taisei Ikata Town 246.293 1572.9 3969.94
Chitose-daira Rokkasho Village 245.868 2320.01 3967.2
Gifu 243.951 3822.72 3961.73
Fukkoshi Yokohama Town 243.102 2250.41 3967.2
Shimane 240.651 3822.72 3961.73
Sunagomata Higashidoori Village 238.012 3253.8 3967.2
Obuchi Rokkasho Village 237.506 2586.79 3967.2
Tomari Rokkasho Village 230.636 3619.2 3967.2
kanagawa 226.339 2397.89 3961.73
Saitama 219.770 2085.12 3961.73
Ikatagoshi Ikata Town 217.515 1979.15 3969.94
Touhoku Branch office Touhoku Town 215.416 1873.39 3967.2
Radiation dose at Tohoku University 214.824 3923.42
Odanosawa Higashidoori Village 210.287 2592.6 3967.2
Kagawa 205.829 2675.9 3961.73
Oippe Higashidoori Village 205.182 2233.01 3967.2
Oita 200.921 2953.92 3961.73
Touhoku Town office Touhoku Town 200.811 8665.2 3967.2
Kuchogoshi Ikata Town 198.646 2008.2 3969.94
Minatoura Ikata Town 186.776 1805.03 3969.94
Radiation dose in Koyadori, Ojika 184.905 3917.95
Toyama 184.580 5108.54 3961.73
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 2463.98 3956.26
Radiation dose in Tukahama, Ojika 183.417 3917.95
Chiba 182.407 1529.09 3961.73
Nara 182.387 2780.16 3961.73
Okayama 181.976 3614.21 3961.73
Yamagata 181.598 2849.66 3961.73
Ehime 180.745 2571.65 3961.73
Ishikawa 180.445 4430.88 3961.73
Niigata 177.483 5317.06 3961.73
Hiroshima 176.816 2397.89 3961.73
Mie 174.867 2741.93 3961.73
Fukui 170.045 3370.94 3961.73
Radiation dose in Terama, Ojika 168.036 3917.95
Yamanashi 164.561 2224.13 3961.73
Nagano 162.242 3384.84 3961.73
Saga 161.421 2988.67 3961.73
Tottori 161.392 2745.41 3961.73
Radiation dose in Enoshima, Ojika 160.091 3917.95
Osaka 159.103 2119.87 3961.73
Ibaraki-city Environment 157.249 3876.91
Aichi 149.345 2571.65 3961.73
Toyonoura Ikata Town 149.214 2072.03 3969.94
Shizuoka 148.639 2658.53 3961.73
Kyoto 144.522 3023.42 3961.73
Kagoshima 144.449 3277.11 3961.73
Tokushima 143.627 2328.38 3961.73
Gunma 143.572 1563.84 3961.73
Hyogo 139.710 2641.15 3961.73
Fukuoka 136.511 2745.41 3961.73
Wakayama 133.857 1946.11 3961.73
Radiation at Tamaki-cho Mie Japan 133.138 3876.91
Akita 132.832 2988.67 3961.73
Shiga 124.919 2119.87 3961.73
Nagasaki 109.459 2397.89 3961.73
Hokkaido 109.189 3648.96 3961.73
Kumamoto 103.568 2328.38 3961.73
Aomori 101.819 3544.7 3961.73
Miyazaki 100.354 2307.53 3961.73
Kochi 95.931 2641.15 3961.73
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 2455.46 3942.58
Iwate 90.324 2919.17 3961.73
Environment Feeds from Ohta 83.623 3876.91
Okinawa 82.305 1998.24 3961.73
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