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Accumulated absorbed dose rate - T=13.03.2011 - 31.03.2017(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 5961.74
Fukushima I MP8 570942.000 5961.74
Fukushima I MP6 240668.000 5961.74
Yamada Futaba Town 176983.000 4631.05 5518.51
Fukushima I MP2 140420.000 5961.74
Fukushima I MP5 111325.000 5961.74
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3757.32 6032.88
Fukushima I MP3 93730.602 5961.74
Fukushima I MP4 86821.500 5961.74
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3757.32 6032.88
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3706.2 5950.8
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3757.32 6032.88
Ono Okuma Town 38610.500 4276.02 5518.51
Shinzan Futaba Town 38332.801 3880.72 5518.51
Fukushima I MP1 31496.801 5961.74
Yonomori Tomioka Town 29815.900 4421.25 5518.51
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3757.32 6032.88
Tomioka Tomioka Town 25324.500 4760.1 5518.51
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3757.32 6032.88
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3757.32 6032.88
Shimo-Kooriyama Tomioka Town 13057.000 4727.86 5518.51
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3757.32 6032.88
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3757.32 6032.88
Kami-kooriyama Tomioka Town 11803.900 3711.3 5518.51
Fukushima II MP3 11060.600 5961.74
Fukushima II MP1 10903.000 5961.74
Kooriyama Futaba Town 10352.900 4324.43 5518.51
Fukushima II MP4 9696.330 5961.74
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3753.91 6027.41
Fukushima II MP5 9382.150 5961.74
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3757.32 6032.88
Matsudate Naraha Town 8410.890 5050.55 5518.51
Shigeoka Naraha Town 8115.970 5583.04 5518.51
Fukushima II MP2 7875.320 5961.74
Namie Namie Town 7321.210 4074.36 5518.51
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5978.16
Fukushima II MP6 7062.690 5961.74
Fukushima II MP7 6511.580 5959.01
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3757.32 6032.88
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3757.32 6032.88
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3757.32 6032.88
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3757.32 6032.88
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3757.32 6032.88
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3757.32 6032.88
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3752.21 6024.67
Futatsunuma Hirono Town 3520.340 4840.8 5518.51
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3757.32 6032.88
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3757.32 6032.88
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5975.42
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3757.32 6032.88
Kiyohashi Namie Town 3162.000 3574.11 5518.51
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3752.21 6024.67
Radiation dose at Agricultural center, Koriyama 3128.960 5975.42
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3757.32 6032.88
Radiation dose at Koriyama city office, Koriyama 2803.520 5975.42
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3757.32 6032.88
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3752.21 6024.67
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3757.32 6032.88
Yamadaoka Naraha Town 2205.340 4292.19 5518.51
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5978.16
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3757.32 6032.88
Kuji Hitachi City 1990.890 9330.82 6043.82
Hitachinaka Hitachinaka City 1951.950 4098.03 6041.09
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3752.21 6024.67
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3752.21 6024.67
Momiyama Hokota City 1837.540 4674.26 6043.82
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3752.21 6024.67
Horiguchi Hitachinaka City 1779.410 4084.08 6046.56
Onuma Hitachi City 1776.950 3479.83 6041.09
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3757.32 6032.88
Tsukuriya Hokota City 1736.890 3932.04 6043.82
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5975.42
Nemoto Hitachioomiya City 1633.190 4380.69 6041.09
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3757.32 6032.88
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3757.32 6032.88
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5983.63
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3757.32 6032.88
Radiation dose at JAEA Oarai (P12) 1512.140 6000.05
Radiation dose at Ose administration center, Koriyama 1494.270 5975.42
Araji Hokota City 1437.760 3940.84 6043.82
Ishigami Tokai Village 1431.690 3587.43 6043.82
Mawatari Hitachinaka City 1422.870 4144.1 6043.82
Radiation dose at JAEA Oarai (P11) 1399.370 6000.05
Onuki Oarai Town 1387.990 4303.15 6043.82
Sawa Hitachinaka City 1353.770 3250.16 6041.09
Toyooka Tokai Village 1321.760 3949.69 6043.82
Ajigaura Hitachinaka City 1313.890 3886.06 6041.09
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3757.32 6032.88
Geiger Counter Feeds from Asao Kawasaki 1266.620 5953.54
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5975.42
Isohama Oarai Town 1250.540 3751.88 6038.35
Ebisawa Ibaraki Town 1222.240 10185.1 6041.09
Muramatsu Tokai Village 1203.520 3985.05 6043.82
Kamitoda Hokota City 1184.740 3269.34 6043.82
Yanagisawa Hitachinaka City 1166.970 3329.65 6041.09
Tokushuku Hokota City 1159.730 2951.24 6043.82
Tasaki Hokota City 1153.300 3490.44 6013.73
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3757.32 6032.88
Kadobe Naka City 1086.580 7931.15 6041.09
Radiation dose at Date city office, Date 1076.050 5978.16
Oshinobe Tokai Village 1041.340 3719.97 6043.82
Oba Mito City 1037.670 12220.2 6043.82
Godai Naka City 1031.270 3225.12 6043.82
Ishikawa Mito City 1030.810 3801.22 6046.56
Isobe Hitachiota City 1013.130 18343.5 6043.82
Yatabe Ibaraki Town 996.127 3189.81 6043.82
Radiation dose at Motomiya city office, Motomiya 992.703 5978.16
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3752.21 6024.67
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3752.21 6024.67
Yokobori Naka City 930.280 3737.63 6043.82
Sugaya Naka City 926.186 5710.66 6046.56
Kounosu Naka City 926.087 2915.88 6043.82
Funaishikawa Tokai Village 900.399 3870.17 6043.82
Nukada Naka City 899.900 3495.89 6038.35
Uridura Naka City 890.113 3336.98 6038.35
Shiraki Tsuruga City 881.330 7080.84 6046.56
Motokomezaki Naka City 880.851 3110.95 6010.99
Shiraki pass Tsuruga City 850.284 7416.74 6046.56
Radiation dose in Yamamoto 846.633 6000.05
Yoshizawa Mito City 837.646 3375.37 6043.82
Radiation dose at JAEA Oarai (P7) 831.135 6000.05
Mayumi Hitachiota City 828.119 3348.86 6043.82
Urasoko Tsuruga City 826.465 5878.58 6046.56
Nemoto Hitachioomiya City 825.588 3771.28 6041.09
Takenami Mihama Town 804.283 6170.3 6046.56
Radiation dose at JAEA Oarai (P15) 780.207 6000.05
Tateishi Tsuruga City 780.092 4888.54 6046.56
Radiation dose at JAEA Oarai (P14) 770.174 6000.05
Radiation dose at JAEA Oarai (P13) 769.612 6000.05
Ukishima Kawasaki Ward 735.475 11536.2 6046.56
Kume Hitachiota City 713.958 3278.14 6043.82
Radiation dose at JAEA Oarai (P2) 712.011 6000.05
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3752.21 6024.67
Nyuu Mihama Town 674.787 5622.24 6046.56
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3757.32 6032.88
Radiation dose in Iwanuma 670.242 6000.05
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3757.32 6032.88
Tsuruga Tsuruga City 655.360 4959.24 6046.56
Shiohama Kawasaki Ward 653.536 3960.34 6046.56
Radiation dose in Kakuda 649.863 6000.05
Sakajiri Mihama Town 649.252 6559.3 6046.56
North point of Kinki University Atomic Energy Research Instirute Station 639.566 4119.46 6046.56
Radiation dose in Onagawa (MP-2) 632.968 5997.31
Kumatori town Nishi primary school Station 631.491 4923.86 6046.56
Oshima Kawasaki Ward 630.402 3774.7 6046.56
Izumisano municipal Oike athletic field Station 629.920 5551.54 6046.56
Atom-kyoudou nursery school Station 625.566 5330.52 6046.56
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4853.16 6046.56
Nakamachi Omaezaki City 623.494 6249.86 6046.56
Uraga Yokosuka City 622.492 2961.38 6046.56
Goritoge Shika Town 622.143 6638.86 6046.56
Kumatori town Minami primary school Station 606.134 5648.76 6046.56
Radiation dose at JAEA Oarai (P1) 603.643 6002.78
Yamanotedai-No.1 Park Station 599.140 5268.62 6046.56
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 6019.2
Noumi Shika Town 594.021 6568.1 6046.56
Radiation dose in Watari 591.851 6000.05
Hairando Yokosuka City 588.667 3712.8 6046.56
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3757.32 6032.88
Ningyotoge Kagamino Town 574.857 5268.62 6046.56
Ten-no Kagamino Town 569.960 6311.76 6046.56
Funagura Yokosuka City 563.909 3500.64 6046.56
Chidori Kawasaki Ward 560.211 3385.7 6046.56
Radiation dose at JAEA Oarai (P16) 556.365 6000.05
Shika Shika Town 551.376 6329.42 6046.56
Higashiosaka municipal Kamikosaka primary scool Station 550.277 4110.6 6046.56
Sahara Yokosuka City 547.404 3279.62 6046.56
Kazanashi Shika Town 545.377 5940.48 6046.56
Akasumi Shika Town 544.970 5436.6 6046.56
Kurahashi Maizuru City 540.820 4950.38 6046.56
Obama Obama City 540.809 4428.84 6046.56
Sakuragaike community hall Omaezaki City 540.772 6408.98 6046.56
Shirowa primary school Omaezaki City 535.692 6276.38 6046.56
Radiation dose at JAEA Oarai (P5) 529.759 6000.05
Uenohara Omaezaki City 529.333 6453.22 6046.56
Kumano Shika Town 529.019 6161.5 6046.56
Izumisano municipal Hineno filtration plant Station 527.471 5312.86 6046.56
Nishi-hamasada Matsue City 525.089 5880.29 6030.14
Kouno Minami-Echizen Town 525.028 4455.36 6046.56
Kurihama Yokosuka City 523.708 3544.82 6046.56
Osaka prefectural Kumatori off-site-center Station 522.808 4897.34 6046.56
Ogasa branch Kikugawa City 522.039 6526.78 6032.88
Izumisano municipal Hineno primary scool Station 518.181 4252.06 6046.56
Shirasuna Omaezaki City 499.479 6320.62 6046.56
Jitougata primary school Makinohara City 498.059 6064.22 6046.56
Kataku Matsue City 497.007 4711.7 6046.56
Nishihemi Yokosuka City 496.917 2828.78 6046.56
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 6019.2
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4641 6046.56
Otomi Takahama Town 494.821 5197.92 6046.56
Otsu Nanao City 493.895 5215.58 6046.56
The Observation point for comparison Tatsunokuchi 493.454 4296.24 6046.56
Hitsuhama Ohi Town 492.630 4835.5 6046.56
Kijiyama Misasa Town 489.284 4906.2 6046.56
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 6019.2
Hiraba Omaezaki City 485.878 6320.62 6046.56
Tayu Matsue City 484.956 4915.06 6046.56
Hamaokakita primary school Omaezaki City 484.537 6482.7 6032.88
Oitomi Ayabe City 474.670 6232.2 6046.56
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 6019.2
Kashiwazaki-shigai Kashiwazaki City 470.822 4959.24 6046.56
Mitsu Matsue City 466.897 4702.9 6046.56
Tonomachi Kawasaki Ward 463.967 5958.14 6046.56
Daitou branch Kakegawa City 463.829 6385.7 6032.88
Fukura Shika Town 462.493 5931.62 6046.56
Nagasawa Yokosuka City 462.365 3465.26 6046.56
The athletic field Station of Kinki University 461.661 3916.1 6046.56
Koura Matsue City 461.049 5613.38 6046.56
Sakurasan Ward Omaezaki City 459.434 6117.26 6046.56
Tsuchikawa Nanao City 458.915 5772.5 6046.56
Kumatori Town office Station 457.917 4039.9 6046.56
Shinkango Omaezaki City 449.013 7080.84 6046.56
Ogurui Takahama Town 448.279 4632.14 6046.56
Kusabue Omaezaki City 444.162 6674.18 6046.56
Omaezaki City monitoring center 443.946 6550.44 6046.56
Akawase Kagamino Town 442.246 4039.9 6046.56
Ibaraki 442.139 2966.21 6038.35
Hinode Town Yokosuka City 438.324 2333.76 6046.56
Nishiyama Kashiwazaki City 437.251 7018.94 6046.56
Kariwa Kariwa Village 436.307 5295.14 6046.56
Osaka prefectural Hineno high scool Station 435.745 4720.56 6046.56
Miyagawa Kashiwazaki City 435.245 5224.44 6046.56
Radiation dose in Natori 434.640 6000.05
Kami-koubu Matsue City 433.868 5136.02 6046.56
Shimo-Takamachi Kariwa Village 433.192 5763.7 6046.56
Osaka prefectural Sano supporting school Station 432.398 5144.88 6046.56
Arahama Kashiwazaki City 428.874 5383.56 6046.56
Doai Kashiwazaki City 425.681 5065.32 6046.56
Owashi Matsue City 424.452 5021.14 6046.56
Okayasu Maizuru City 422.568 5913.96 6046.56
Katsuyama Kariwa Village 421.280 5383.56 6046.56
Kita-koubu Matsue City 420.683 5507.3 6046.56
Kichisaka Maizuru City 413.065 7186.92 6046.56
Nagai Ohi Town 410.699 5226.19 6038.35
Shiokumi Maizuru City 407.938 8946.1 6046.56
Miyadome Ohi Town 407.831 4331.62 6046.56
Kariwa Kariwa Village 407.617 5578.06 6046.56
Ueno Satsuma-sendai City 394.248 4048.7 6046.56
Power Station-South 389.191 5896.3 6046.56
Radiation dose at JAEA Oarai (P6) 386.963 6000.05
Power Station- 385.546 5754.84 6046.56
Takae Satsuma-sendai City 379.551 4101.74 6046.56
Hokawaduura Genkai Town 378.015 6245.46 6046.56
Kou Itimatsu Suetsugu 377.929 4508.4 6046.56
Minato Satsuma-sendai City 377.656 3756.98 6046.56
Iwanai Iwanai Town 376.336 6123.35 6043.82
Hattari Kyowa Town 373.047 5955.45 6043.82
Chatsu Tomari Village 371.011 5690.37 6043.82
Oyama Maizuru City 358.223 5180.26 6046.56
Kodaira Satsuma-sendai City 355.545 3801.22 6046.56
Kayanuma Tomari Village 354.809 5063.03 6043.82
Anojiri Obama City 353.215 4243.2 6046.56
Kushi Genkai Town 349.738 8619 6046.56
Yamaguchi 348.715 6779.9 6038.35
Sadahongou Matsue City 348.228 5277.48 6046.56
Sakibe Karatsu City 347.801 8168.16 6046.56
Hirao Genkai Town 343.814 8610.14 6046.56
The Meteorological Obsevatory of kyowa Town 343.275 5646.2 6043.82
Minami-Horoni Kyowa Town 335.180 5292.75 6043.82
Kounoura Takahama Town 330.353 4473.02 6046.56
Kyoudomarisaki Karatsu City 328.622 8751.6 6046.56
Horikappu Jinja Tomari Village 328.230 5478.3 6043.82
Hukada-kita Matsue City 327.031 4340.42 6046.56
Radiation dose in KEK, Tsukuba 326.240 6019.2
Herokaruusu Tomari Village 324.242 5681.57 6043.82
Yorita Satsuma-sendai City 323.218 4446.5 6046.56
Kamoenai Kamoenai Village 322.032 4797.95 6043.82
Radiation dose in Onagawa (MP-6) 316.267 5997.31
Imamura Genkai Town 314.749 74167.4 6046.56
Yamanaka Takahama Town 314.185 5772.5 6046.56
Sendai (Miyagi) 312.585 2717.26 6038.35
Radiation dose in Onagawa (MP-1) 300.147 5997.31
Gumisaki Satsuma-sendai City 295.693 3589.06 6046.56
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 6019.2
Aomori Aomori City 285.372 3649.25 6043.82
Misawa City hall Misawa City 283.728 7077.64 6043.82
Kashu Ikata Town 277.173 3703.94 6046.56
Noheji Town Office Noheji Town 272.004 3127.94 6043.82
Takasimamati 271.103 3942.62 6046.56
Radiation dose in Onagawa (MP-3) 270.563 5997.31
Kucho Ikata Town 269.545 3270.82 6046.56
Radiation dose in Marumori 269.436 6000.05
Kawanagata Ikata Town 266.821 3191.26 6046.56
Tochigi 260.733 3548.86 6038.35
Chikagawa Mutu City 256.719 4073.38 6043.82
Yokohama Town Office Yokohama Town 254.846 4992.36 6043.82
Tokyo 251.877 4184.47 6038.35
Hiranuma Rokkasho Village 251.186 3278.14 6043.82
Taisei Ikata Town 246.293 2395.66 6046.56
Chitose-daira Rokkasho Village 245.868 3534.42 6043.82
Gifu 243.951 5826.48 6038.35
Fukkoshi Yokohama Town 243.102 3428.39 6043.82
Shimane 240.651 5826.48 6038.35
Sunagomata Higashidoori Village 238.012 4957 6043.82
Obuchi Rokkasho Village 237.506 3940.84 6043.82
Tomari Rokkasho Village 230.636 5513.66 6043.82
kanagawa 226.339 3654.79 6038.35
Saitama 219.770 3178.08 6038.35
Ikatagoshi Ikata Town 217.515 3014.42 6046.56
Touhoku Branch office Touhoku Town 215.416 2854.01 6043.82
Radiation dose at Tohoku University 214.824 6000.05
Odanosawa Higashidoori Village 210.287 3949.69 6043.82
Kagawa 205.829 4078.54 6038.35
Oippe Higashidoori Village 205.182 3401.88 6043.82
Oita 200.921 4502.28 6038.35
Touhoku Town office Touhoku Town 200.811 13201 6043.82
Kuchogoshi Ikata Town 198.646 3058.66 6046.56
Minatoura Ikata Town 186.776 2749.22 6046.56
Radiation dose in Koyadori, Ojika 184.905 5994.58
Toyama 184.580 7786.3 6038.35
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3757.32 6032.88
Radiation dose in Tukahama, Ojika 183.417 5994.58
Chiba 182.407 2330.59 6038.35
Nara 182.387 4237.44 6038.35
Okayama 181.976 5508.67 6038.35
Yamagata 181.598 4343.38 6038.35
Ehime 180.745 3919.63 6038.35
Ishikawa 180.445 6753.42 6038.35
Niigata 177.483 8104.1 6038.35
Hiroshima 176.816 3654.79 6038.35
Mie 174.867 4179.18 6038.35
Fukui 170.045 5137.9 6038.35
Radiation dose in Terama, Ojika 168.036 5994.58
Yamanashi 164.561 3389.95 6038.35
Nagano 162.242 5159.08 6038.35
Saga 161.421 4555.25 6038.35
Tottori 161.392 4184.47 6038.35
Radiation dose in Enoshima, Ojika 160.091 5994.58
Osaka 159.103 3231.05 6038.35
Ibaraki-city Environment 157.249 5953.54
Aichi 149.345 3919.63 6038.35
Toyonoura Ikata Town 149.214 3155.88 6046.56
Shizuoka 148.639 4052.05 6038.35
Kyoto 144.522 4608.22 6038.35
Kagoshima 144.449 4994.88 6038.35
Tokushima 143.627 3548.86 6038.35
Gunma 143.572 2383.56 6038.35
Hyogo 139.710 4025.57 6038.35
Fukuoka 136.511 4184.47 6038.35
Wakayama 133.857 2966.21 6038.35
Radiation at Tamaki-cho Mie Japan 133.138 5953.54
Akita 132.832 4555.25 6038.35
Shiga 124.919 3231.05 6038.35
Nagasaki 109.459 3654.79 6038.35
Hokkaido 109.189 5561.64 6038.35
Kumamoto 103.568 3548.86 6038.35
Aomori 101.819 5402.74 6038.35
Miyazaki 100.354 3517.08 6038.35
Kochi 95.931 4025.57 6038.35
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3748.8 6019.2
Iwate 90.324 4449.31 6038.35
Environment Feeds from Ohta 83.623 5953.54
Okinawa 82.305 3045.66 6038.35
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