This website uses cookies. Read about how we use cookies. OK

                               

Accumulated absorbed dose rate - T=13.03.2011 - 27.02.2017(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 5874.19
Fukushima I MP8 570942.000 5874.19
Fukushima I MP6 240668.000 5874.19
Yamada Futaba Town 176983.000 4557.58 5430.96
Fukushima I MP2 140420.000 5874.19
Fukushima I MP5 111325.000 5874.19
Fukushima [32] (distance from Fukushima I: 30 km) 101500.000 3702.79 5945.33
Fukushima I MP3 93730.602 5874.19
Fukushima I MP4 86821.500 5874.19
Fukushima [33] (distance from Fukushima I: 30 km) 77197.703 3702.79 5945.33
Fukushima [79] (distance from Fukushima I: 40 km) 54008.602 3651.67 5863.25
Fukushima [31] (distance from Fukushima I: 30 km) 40677.398 3702.79 5945.33
Ono Okuma Town 38610.500 4208.18 5430.96
Shinzan Futaba Town 38332.801 3819.16 5430.96
Fukushima I MP1 31496.801 5874.19
Yonomori Tomioka Town 29815.900 4351.1 5430.96
Fukushima [46] (distance from Fukushima I: 20 km) 28842.500 3702.79 5945.33
Tomioka Tomioka Town 25324.500 4684.58 5430.96
Fukushima [62] (distance from Fukushima I: 40 km) 16464.100 3702.79 5945.33
Fukushima [61] (distance from Fukushima I: 40 km) 13102.800 3702.79 5945.33
Shimo-Kooriyama Tomioka Town 13057.000 4652.86 5430.96
Fukushima [21] (distance from Fukushima I: 30 km) 12103.800 3702.79 5945.33
Fukushima [3] (distance from Fukushima I: 45 km) 11985.000 3702.79 5945.33
Kami-kooriyama Tomioka Town 11803.900 3652.42 5430.96
Fukushima II MP3 11060.600 5874.19
Fukushima II MP1 10903.000 5874.19
Kooriyama Futaba Town 10352.900 4255.82 5430.96
Fukushima II MP4 9696.330 5874.19
Fukushima [34] (distance from Fukushima I: 30 km) 9540.450 3699.38 5939.86
Fukushima II MP5 9382.150 5874.19
Fukushima [2] (distance from Fukushima I: 55 km) 8841.760 3702.79 5945.33
Matsudate Naraha Town 8410.890 4970.42 5430.96
Shigeoka Naraha Town 8115.970 5494.46 5430.96
Fukushima II MP2 7875.320 5874.19
Namie Namie Town 7321.210 4009.72 5430.96
Radiation dose at Shirasawa branch office, Motomiya 7287.920 5890.61
Fukushima II MP6 7062.690 5874.19
Fukushima II MP7 6511.580 5871.46
Fukushima [1] (distance from Fukushima I: 60 km) 5615.310 3702.79 5945.33
Fukushima [11] (distance from Fukushima I: 40 km) 5491.310 3702.79 5945.33
Fukushima [63] (distance from Fukushima I: 45 km) 5448.820 3702.79 5945.33
Fukushima [45] (distance from Fukushima I: 20 km) 3981.200 3702.79 5945.33
Fukushima [42] (distance from Fukushima I: 30 km) 3850.600 3702.79 5945.33
Fukushima [10] (distance from Fukushima I: 40 km) 3734.160 3702.79 5945.33
Fukushima [78] (distance from Fukushima I: 45 km) 3716.820 3697.68 5937.12
Futatsunuma Hirono Town 3520.340 4764 5430.96
Fukushima [4] (distance from Fukushima I: 50 km) 3386.310 3702.79 5945.33
Fukushima [7] (distance from Fukushima I: 45 km) 3313.930 3702.79 5945.33
Radiation dose at Koriyama joint government building, Koriyama 3232.890 5887.87
Fukushima [15] (distance from Fukushima I: 35 km) 3178.670 3702.79 5945.33
Kiyohashi Namie Town 3162.000 3517.4 5430.96
Fukushima [71] (distance from Fukushima I: 25 km) 3161.650 3697.68 5937.12
Radiation dose at Agricultural center, Koriyama 3128.960 5887.87
Fukushima [41] (distance from Fukushima I: 20 km) 3111.490 3702.79 5945.33
Radiation dose at Koriyama city office, Koriyama 2803.520 5887.87
Fukushima [44] (distance from Fukushima I: 30 km) 2535.550 3702.79 5945.33
Fukushima [72] (distance from Fukushima I: 30 km) 2344.620 3697.68 5937.12
Fukushima [43] (distance from Fukushima I: 20 km) 2244.110 3702.79 5945.33
Yamadaoka Naraha Town 2205.340 4224.1 5430.96
Radiation dose at Iwane Fureai Plaza, Motomiya 2169.060 5890.61
Fukushima [22] (distance from Fukushima I: 35 km) 2020.650 3702.79 5945.33
Kuji Hitachi City 1990.890 9195.65 5956.27
Hitachinaka Hitachinaka City 1951.950 4038.64 5953.54
Fukushima [76] (distance from Fukushima I: 25 km) 1945.520 3697.68 5937.12
Fukushima [80] (distance from Fukushima I: 25 km) 1876.860 3697.68 5937.12
Momiyama Hokota City 1837.540 4606.55 5956.27
Fukushima [77] (distance from Fukushima I: 25 km) 1802.490 3697.68 5937.12
Horiguchi Hitachinaka City 1779.410 4024.94 5959.01
Onuma Hitachi City 1776.950 3429.39 5953.54
Fukushima [6] (distance from Fukushima I: 45 km) 1741.180 3702.79 5945.33
Tsukuriya Hokota City 1736.890 3875.08 5956.27
Radiation dose at Big palette Fukushima, Koriyama 1668.540 5887.87
Nemoto Hitachioomiya City 1633.190 4317.2 5953.54
Fukushima [13] (distance from Fukushima I: 40 km) 1624.150 3702.79 5945.33
Fukushima [23] (distance from Fukushima I: 35 km) 1551.750 3702.79 5945.33
Radiation dose at Tsukidatemachi kamitedo, Date 1545.300 5896.08
Fukushima [14] (distance from Fukushima I: 35 km) 1543.460 3702.79 5945.33
Radiation dose at JAEA Oarai (P12) 1512.140 5912.5
Radiation dose at Ose administration center, Koriyama 1494.270 5887.87
Araji Hokota City 1437.760 3883.75 5956.27
Ishigami Tokai Village 1431.690 3535.47 5956.27
Mawatari Hitachinaka City 1422.870 4084.07 5956.27
Radiation dose at JAEA Oarai (P11) 1399.370 5912.5
Onuki Oarai Town 1387.990 4240.81 5956.27
Sawa Hitachinaka City 1353.770 3203.05 5953.54
Toyooka Tokai Village 1321.760 3892.48 5956.27
Ajigaura Hitachinaka City 1313.890 3829.74 5953.54
Fukushima [5] (distance from Fukushima I: 45 km) 1282.090 3702.79 5945.33
Geiger Counter Feeds from Asao Kawasaki 1266.620 5865.98
Radiation dose at Tamokami elementary school, Koriyama 1256.140 5887.87
Isohama Oarai Town 1250.540 3697.48 5950.8
Ebisawa Ibaraki Town 1222.240 10037.5 5953.54
Muramatsu Tokai Village 1203.520 3927.33 5956.27
Kamitoda Hokota City 1184.740 3221.98 5956.27
Yanagisawa Hitachinaka City 1166.970 3281.39 5953.54
Tokushuku Hokota City 1159.730 2908.49 5956.27
Tasaki Hokota City 1153.300 3439.63 5926.18
Fukushima [20] (distance from Fukushima I: 45 km) 1145.390 3702.79 5945.33
Kadobe Naka City 1086.580 7816.21 5953.54
Radiation dose at Date city office, Date 1076.050 5890.61
Oshinobe Tokai Village 1041.340 3666.09 5956.27
Oba Mito City 1037.670 12043.2 5956.27
Godai Naka City 1031.270 3178.4 5956.27
Ishikawa Mito City 1030.810 3746.18 5959.01
Isobe Hitachiota City 1013.130 18077.8 5956.27
Yatabe Ibaraki Town 996.127 3143.61 5956.27
Radiation dose at Motomiya city office, Motomiya 992.703 5890.61
Fukushima [73] (distance from Fukushima I: 35 km) 981.984 3697.68 5937.12
Fukushima [75] (distance from Fukushima I: 45 km) 960.529 3697.68 5937.12
Yokobori Naka City 930.280 3683.48 5956.27
Sugaya Naka City 926.186 5627.97 5959.01
Kounosu Naka City 926.087 2873.64 5956.27
Funaishikawa Tokai Village 900.399 3814.1 5956.27
Nukada Naka City 899.900 3445.2 5950.8
Uridura Naka City 890.113 3288.6 5950.8
Shiraki Tsuruga City 881.330 6978.31 5959.01
Motokomezaki Naka City 880.851 3065.64 5923.44
Shiraki pass Tsuruga City 850.284 7309.35 5959.01
Radiation dose in Yamamoto 846.633 5912.5
Yoshizawa Mito City 837.646 3326.47 5956.27
Radiation dose at JAEA Oarai (P7) 831.135 5912.5
Mayumi Hitachiota City 828.119 3300.35 5956.27
Urasoko Tsuruga City 826.465 5793.46 5959.01
Nemoto Hitachioomiya City 825.588 3716.63 5953.54
Takenami Mihama Town 804.283 6080.96 5959.01
Radiation dose at JAEA Oarai (P15) 780.207 5912.5
Tateishi Tsuruga City 780.092 4817.75 5959.01
Radiation dose at JAEA Oarai (P14) 770.174 5912.5
Radiation dose at JAEA Oarai (P13) 769.612 5912.5
Ukishima Kawasaki Ward 735.475 11369.2 5959.01
Kume Hitachiota City 713.958 3230.65 5956.27
Radiation dose at JAEA Oarai (P2) 712.011 5912.5
Fukushima [74] (distance from Fukushima I: 35 km) 706.552 3697.68 5937.12
Nyuu Mihama Town 674.787 5540.83 5959.01
Fukushima [52] (distance from Fukushima I: 40 km) 672.743 3702.79 5945.33
Radiation dose in Iwanuma 670.242 5912.5
Fukushima [51] (distance from Fukushima I: 40 km) 665.376 3702.79 5945.33
Tsuruga Tsuruga City 655.360 4887.43 5959.01
Shiohama Kawasaki Ward 653.536 3902.99 5959.01
Radiation dose in Kakuda 649.863 5912.5
Sakajiri Mihama Town 649.252 6464.32 5959.01
North point of Kinki University Atomic Energy Research Instirute Station 639.566 4059.81 5959.01
Radiation dose in Onagawa (MP-2) 632.968 5909.76
Kumatori town Nishi primary school Station 631.491 4852.57 5959.01
Oshima Kawasaki Ward 630.402 3720.04 5959.01
Izumisano municipal Oike athletic field Station 629.920 5471.15 5959.01
Atom-kyoudou nursery school Station 625.566 5253.34 5959.01
South point of Kinki University Atomic Energy Research Instirute Station 625.202 4782.89 5959.01
Nakamachi Omaezaki City 623.494 6159.37 5959.01
Uraga Yokosuka City 622.492 2918.5 5959.01
Goritoge Shika Town 622.143 6542.73 5959.01
Kumatori town Minami primary school Station 606.134 5566.97 5959.01
Radiation dose at JAEA Oarai (P1) 603.643 5915.23
Yamanotedai-No.1 Park Station 599.140 5192.33 5959.01
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 595.502 5931.65
Noumi Shika Town 594.021 6473 5959.01
Radiation dose in Watari 591.851 5912.5
Hairando Yokosuka City 588.667 3659.04 5959.01
Fukushima [12] (distance from Fukushima I: 40 km) 588.291 3702.79 5945.33
Ningyotoge Kagamino Town 574.857 5192.33 5959.01
Ten-no Kagamino Town 569.960 6220.37 5959.01
Funagura Yokosuka City 563.909 3449.95 5959.01
Chidori Kawasaki Ward 560.211 3336.68 5959.01
Radiation dose at JAEA Oarai (P16) 556.365 5912.5
Shika Shika Town 551.376 6237.77 5959.01
Higashiosaka municipal Kamikosaka primary scool Station 550.277 4051.08 5959.01
Sahara Yokosuka City 547.404 3232.13 5959.01
Kazanashi Shika Town 545.377 5854.46 5959.01
Akasumi Shika Town 544.970 5357.88 5959.01
Kurahashi Maizuru City 540.820 4878.7 5959.01
Obama Obama City 540.809 4364.71 5959.01
Sakuragaike community hall Omaezaki City 540.772 6316.18 5959.01
Shirowa primary school Omaezaki City 535.692 6185.5 5959.01
Radiation dose at JAEA Oarai (P5) 529.759 5912.5
Uenohara Omaezaki City 529.333 6359.78 5959.01
Kumano Shika Town 529.019 6072.28 5959.01
Izumisano municipal Hineno filtration plant Station 527.471 5235.93 5959.01
Nishi-hamasada Matsue City 525.089 5794.91 5942.59
Kouno Minami-Echizen Town 525.028 4390.85 5959.01
Kurihama Yokosuka City 523.708 3493.49 5959.01
Osaka prefectural Kumatori off-site-center Station 522.808 4826.43 5959.01
Ogasa branch Kikugawa City 522.039 6432.06 5945.33
Izumisano municipal Hineno primary scool Station 518.181 4190.49 5959.01
Shirasuna Omaezaki City 499.479 6229.1 5959.01
Jitougata primary school Makinohara City 498.059 5976.41 5959.01
Kataku Matsue City 497.007 4643.48 5959.01
Nishihemi Yokosuka City 496.917 2787.82 5959.01
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 496.721 5931.65
Satsuma-sendai monitoring center Satsuma-sendai City 495.302 4573.8 5959.01
Otomi Takahama Town 494.821 5122.66 5959.01
Otsu Nanao City 493.895 5140.06 5959.01
The Observation point for comparison Tatsunokuchi 493.454 4234.03 5959.01
Hitsuhama Ohi Town 492.630 4765.48 5959.01
Kijiyama Misasa Town 489.284 4835.16 5959.01
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 487.055 5931.65
Hiraba Omaezaki City 485.878 6229.1 5959.01
Tayu Matsue City 484.956 4843.89 5959.01
Hamaokakita primary school Omaezaki City 484.537 6388.62 5945.33
Oitomi Ayabe City 474.670 6141.96 5959.01
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 472.017 5931.65
Kashiwazaki-shigai Kashiwazaki City 470.822 4887.43 5959.01
Mitsu Matsue City 466.897 4634.8 5959.01
Tonomachi Kawasaki Ward 463.967 5871.87 5959.01
Daitou branch Kakegawa City 463.829 6293.03 5945.33
Fukura Shika Town 462.493 5845.73 5959.01
Nagasawa Yokosuka City 462.365 3415.09 5959.01
The athletic field Station of Kinki University 461.661 3859.4 5959.01
Koura Matsue City 461.049 5532.1 5959.01
Sakurasan Ward Omaezaki City 459.434 6028.69 5959.01
Tsuchikawa Nanao City 458.915 5688.92 5959.01
Kumatori Town office Station 457.917 3981.4 5959.01
Shinkango Omaezaki City 449.013 6978.31 5959.01
Ogurui Takahama Town 448.279 4565.07 5959.01
Kusabue Omaezaki City 444.162 6577.54 5959.01
Omaezaki City monitoring center 443.946 6455.59 5959.01
Akawase Kagamino Town 442.246 3981.4 5959.01
Ibaraki 442.139 2923.2 5950.8
Hinode Town Yokosuka City 438.324 2299.97 5959.01
Nishiyama Kashiwazaki City 437.251 6917.31 5959.01
Kariwa Kariwa Village 436.307 5218.47 5959.01
Osaka prefectural Hineno high scool Station 435.745 4652.21 5959.01
Miyagawa Kashiwazaki City 435.245 5148.79 5959.01
Radiation dose in Natori 434.640 5912.5
Kami-koubu Matsue City 433.868 5061.65 5959.01
Shimo-Takamachi Kariwa Village 433.192 5680.24 5959.01
Osaka prefectural Sano supporting school Station 432.398 5070.38 5959.01
Arahama Kashiwazaki City 428.874 5305.61 5959.01
Doai Kashiwazaki City 425.681 4991.98 5959.01
Owashi Matsue City 424.452 4948.43 5959.01
Okayasu Maizuru City 422.568 5828.33 5959.01
Katsuyama Kariwa Village 421.280 5305.61 5959.01
Kita-koubu Matsue City 420.683 5427.56 5959.01
Kichisaka Maizuru City 413.065 7082.86 5959.01
Nagai Ohi Town 410.699 5150.42 5950.8
Shiokumi Maizuru City 407.938 8816.56 5959.01
Miyadome Ohi Town 407.831 4268.9 5959.01
Kariwa Kariwa Village 407.617 5497.29 5959.01
Ueno Satsuma-sendai City 394.248 3990.08 5959.01
Power Station-South 389.191 5810.92 5959.01
Radiation dose at JAEA Oarai (P6) 386.963 5912.5
Power Station- 385.546 5671.51 5959.01
Takae Satsuma-sendai City 379.551 4042.35 5959.01
Hokawaduura Genkai Town 378.015 6155.03 5959.01
Kou Itimatsu Suetsugu 377.929 4443.12 5959.01
Minato Satsuma-sendai City 377.656 3702.58 5959.01
Iwanai Iwanai Town 376.336 6034.64 5956.27
Hattari Kyowa Town 373.047 5869.17 5956.27
Chatsu Tomari Village 371.011 5607.93 5956.27
Oyama Maizuru City 358.223 5105.25 5959.01
Kodaira Satsuma-sendai City 355.545 3746.18 5959.01
Kayanuma Tomari Village 354.809 4989.68 5956.27
Anojiri Obama City 353.215 4181.76 5959.01
Kushi Genkai Town 349.738 8494.2 5959.01
Yamaguchi 348.715 6681.6 5950.8
Sadahongou Matsue City 348.228 5201.06 5959.01
Sakibe Karatsu City 347.801 8049.89 5959.01
Hirao Genkai Town 343.814 8485.47 5959.01
The Meteorological Obsevatory of kyowa Town 343.275 5564.41 5956.27
Minami-Horoni Kyowa Town 335.180 5216.07 5956.27
Kounoura Takahama Town 330.353 4408.25 5959.01
Kyoudomarisaki Karatsu City 328.622 8624.88 5959.01
Horikappu Jinja Tomari Village 328.230 5398.94 5956.27
Hukada-kita Matsue City 327.031 4277.57 5959.01
Radiation dose in KEK, Tsukuba 326.240 5931.65
Herokaruusu Tomari Village 324.242 5599.26 5956.27
Yorita Satsuma-sendai City 323.218 4382.12 5959.01
Kamoenai Kamoenai Village 322.032 4728.44 5956.27
Radiation dose in Onagawa (MP-6) 316.267 5909.76
Imamura Genkai Town 314.749 73093.5 5959.01
Yamanaka Takahama Town 314.185 5688.92 5959.01
Sendai (Miyagi) 312.585 2677.86 5950.8
Radiation dose in Onagawa (MP-1) 300.147 5909.76
Gumisaki Satsuma-sendai City 295.693 3537.09 5959.01
Radiation via www.houshasen-pref-ibaraki.jp (unofficial information) 286.142 5931.65
Aomori Aomori City 285.372 3596.39 5956.27
Misawa City hall Misawa City 283.728 6975.11 5956.27
Kashu Ikata Town 277.173 3650.31 5959.01
Noheji Town Office Noheji Town 272.004 3082.63 5956.27
Takasimamati 271.103 3885.53 5959.01
Radiation dose in Onagawa (MP-3) 270.563 5909.76
Kucho Ikata Town 269.545 3223.46 5959.01
Radiation dose in Marumori 269.436 5912.5
Kawanagata Ikata Town 266.821 3145.05 5959.01
Tochigi 260.733 3497.4 5950.8
Chikagawa Mutu City 256.719 4014.37 5956.27
Yokohama Town Office Yokohama Town 254.846 4920.04 5956.27
Tokyo 251.877 4123.8 5950.8
Hiranuma Rokkasho Village 251.186 3230.65 5956.27
Taisei Ikata Town 246.293 2360.97 5959.01
Chitose-daira Rokkasho Village 245.868 3483.22 5956.27
Gifu 243.951 5742 5950.8
Fukkoshi Yokohama Town 243.102 3378.72 5956.27
Shimane 240.651 5742 5950.8
Sunagomata Higashidoori Village 238.012 4885.19 5956.27
Obuchi Rokkasho Village 237.506 3883.75 5956.27
Tomari Rokkasho Village 230.636 5433.79 5956.27
kanagawa 226.339 3601.8 5950.8
Saitama 219.770 3132 5950.8
Ikatagoshi Ikata Town 217.515 2970.77 5959.01
Touhoku Branch office Touhoku Town 215.416 2812.67 5956.27
Radiation dose at Tohoku University 214.824 5912.5
Odanosawa Higashidoori Village 210.287 3892.48 5956.27
Kagawa 205.829 4019.4 5950.8
Oippe Higashidoori Village 205.182 3352.6 5956.27
Oita 200.921 4437 5950.8
Touhoku Town office Touhoku Town 200.811 13009.8 5956.27
Kuchogoshi Ikata Town 198.646 3014.37 5959.01
Minatoura Ikata Town 186.776 2709.41 5959.01
Radiation dose in Koyadori, Ojika 184.905 5907.02
Toyama 184.580 7673.4 5950.8
Fukushima [9] (distance from Fukushima I: 45 km) 184.232 3702.79 5945.33
Radiation dose in Tukahama, Ojika 183.417 5907.02
Chiba 182.407 2296.8 5950.8
Nara 182.387 4176 5950.8
Okayama 181.976 5428.8 5950.8
Yamagata 181.598 4280.4 5950.8
Ehime 180.745 3862.8 5950.8
Ishikawa 180.445 6655.5 5950.8
Niigata 177.483 7986.6 5950.8
Hiroshima 176.816 3601.8 5950.8
Mie 174.867 4118.58 5950.8
Fukui 170.045 5063.4 5950.8
Radiation dose in Terama, Ojika 168.036 5907.02
Yamanashi 164.561 3340.8 5950.8
Nagano 162.242 5084.28 5950.8
Saga 161.421 4489.2 5950.8
Tottori 161.392 4123.8 5950.8
Radiation dose in Enoshima, Ojika 160.091 5907.02
Osaka 159.103 3184.2 5950.8
Ibaraki-city Environment 157.249 5865.98
Aichi 149.345 3862.8 5950.8
Toyonoura Ikata Town 149.214 3110.18 5959.01
Shizuoka 148.639 3993.3 5950.8
Kyoto 144.522 4541.4 5950.8
Kagoshima 144.449 4922.46 5950.8
Tokushima 143.627 3497.4 5950.8
Gunma 143.572 2349 5950.8
Hyogo 139.710 3967.2 5950.8
Fukuoka 136.511 4123.8 5950.8
Wakayama 133.857 2923.2 5950.8
Radiation at Tamaki-cho Mie Japan 133.138 5865.98
Akita 132.832 4489.2 5950.8
Shiga 124.919 3184.2 5950.8
Nagasaki 109.459 3601.8 5950.8
Hokkaido 109.189 5481 5950.8
Kumamoto 103.568 3497.4 5950.8
Aomori 101.819 5324.4 5950.8
Miyazaki 100.354 3466.08 5950.8
Kochi 95.931 3967.2 5950.8
Fukushima [35] (distance from Fukushima I: 35 km) 91.917 3694.27 5931.65
Iwate 90.324 4384.8 5950.8
Environment Feeds from Ohta 83.623 5865.98
Okinawa 82.305 3001.5 5950.8
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