Radiation doses in the air / Measurement results by the hour (Ota)

We continuously measure radiation doses in the air (air absorbed doses per hour) at monitoring posts. Measurement results can be obtained by the minute, and we gather measurement data and then display them by the hour or by the day.

The maximum value indicates the largest value measured in each time slot (during the hour or during the day), the minimum value the smallest value measured in each time slot, and the average value is the average value for each time slot.

Shown in µGy/h (microgray per hour)

Gray indicates an amount of energy (absorbed dose) when radiation hits a material object, and 1 gray (Gy) of radiation doses in the air can be converted to 1 sievert (Sv).

Measurement time Dose rate
μGy/h (microgray per hour)
Maximum value Minimum value Average value
10:01-11:00, Fri., 27 Mar. 0.0332 0.0278 0.0311
09:01-10:00, Fri., 27 Mar. 0.0339 0.0290 0.0313
08:01-09:00, Fri., 27 Mar. 0.0343 0.0290 0.0315
07:01-08:00, Fri., 27 Mar. 0.0343 0.0292 0.0316
06:01-07:00, Fri., 27 Mar. 0.0336 0.0288 0.0310
05:01-06:00, Fri., 27 Mar. 0.0334 0.0286 0.0310
04:01-05:00, Fri., 27 Mar. 0.0329 0.0285 0.0310
03:01-04:00, Fri., 27 Mar. 0.0328 0.0290 0.0311
02:01-03:00, Fri., 27 Mar. 0.0333 0.0287 0.0311
01:01-02:00, Fri., 27 Mar. 0.0334 0.0289 0.0311
00:01-01:00, Fri., 27 Mar. 0.0331 0.0291 0.0311
23:01-24:00, Thu., 26 Mar. 0.0321 0.0284 0.0308
22:01-23:00, Thu., 26 Mar. 0.0334 0.0294 0.0310
21:01-22:00, Thu., 26 Mar. 0.0327 0.0286 0.0310
20:01-21:00, Thu., 26 Mar. 0.0329 0.0290 0.0309
19:01-20:00, Thu., 26 Mar. 0.0323 0.0277 0.0306
18:01-19:00, Thu., 26 Mar. 0.0329 0.0288 0.0310
17:01-18:00, Thu., 26 Mar. 0.0332 0.0291 0.0312
16:01-17:00, Thu., 26 Mar. 0.0334 0.0286 0.0311
15:01-16:00, Thu., 26 Mar. 0.0338 0.0294 0.0319
14:01-15:00, Thu., 26 Mar. 0.0356 0.0307 0.0329
13:01-14:00, Thu., 26 Mar. 0.0367 0.0321 0.0344
12:01-13:00, Thu., 26 Mar. 0.0388 0.0327 0.0355
11:01-12:00, Thu., 26 Mar. 0.0386 0.0327 0.0362
10:01-11:00, Thu., 26 Mar. 0.0386 0.0335 0.0360
09:01-10:00, Thu., 26 Mar. 0.0393 0.0344 0.0366
08:01-09:00, Thu., 26 Mar. 0.0393 0.0344 0.0367
07:01-08:00, Thu., 26 Mar. 0.0405 0.0337 0.0376
06:01-07:00, Thu., 26 Mar. 0.0412 0.0358 0.0386
05:01-06:00, Thu., 26 Mar. 0.0433 0.0379 0.0408
04:01-05:00, Thu., 26 Mar. 0.0429 0.0379 0.0404
03:01-04:00, Thu., 26 Mar. 0.0421 0.0367 0.0394
02:01-03:00, Thu., 26 Mar. 0.0412 0.0369 0.0394
01:01-02:00, Thu., 26 Mar. 0.0436 0.0388 0.0405
00:01-01:00, Thu., 26 Mar. 0.0420 0.0369 0.0397
23:01-24:00, Wed., 25 Mar. 0.0427 0.0366 0.0398
22:01-23:00, Wed., 25 Mar. 0.0408 0.0353 0.0382
21:01-22:00, Wed., 25 Mar. 0.0404 0.0355 0.0385
20:01-21:00, Wed., 25 Mar. 0.0401 0.0353 0.0374
19:01-20:00, Wed., 25 Mar. 0.0409 0.0343 0.0381
18:01-19:00, Wed., 25 Mar. 0.0412 0.0369 0.0388
17:01-18:00, Wed., 25 Mar. 0.0419 0.0367 0.0394
16:01-17:00, Wed., 25 Mar. 0.0425 0.0363 0.0399
15:01-16:00, Wed., 25 Mar. 0.0446 0.0379 0.0413
14:01-15:00, Wed., 25 Mar. 0.0440 0.0383 0.0408
13:01-14:00, Wed., 25 Mar. 0.0440 0.0365 0.0405
12:01-13:00, Wed., 25 Mar. 0.0395 0.0325 0.0356
11:01-12:00, Wed., 25 Mar. 0.0363 0.0305 0.0332
10:01-11:00, Wed., 25 Mar. 0.0347 0.0279 0.0320
09:01-10:00, Wed., 25 Mar. 0.0333 0.0297 0.0318
08:01-09:00, Wed., 25 Mar. 0.0342 0.0289 0.0319
07:01-08:00, Wed., 25 Mar. 0.0345 0.0292 0.0321
06:01-07:00, Wed., 25 Mar. 0.0350 0.0296 0.0322
05:01-06:00, Wed., 25 Mar. 0.0342 0.0296 0.0319
04:01-05:00, Wed., 25 Mar. 0.0344 0.0297 0.0322
03:01-04:00, Wed., 25 Mar. 0.0336 0.0290 0.0315
02:01-03:00, Wed., 25 Mar. 0.0348 0.0294 0.0319
01:01-02:00, Wed., 25 Mar. 0.0349 0.0301 0.0317
00:01-01:00, Wed., 25 Mar. 0.0344 0.0298 0.0319
23:01-24:00, Tue., 24 Mar. 0.0333 0.0297 0.0314
22:01-23:00, Tue., 24 Mar. 0.0346 0.0291 0.0316
21:01-22:00, Tue., 24 Mar. 0.0343 0.0290 0.0317
20:01-21:00, Tue., 24 Mar. 0.0329 0.0295 0.0314
19:01-20:00, Tue., 24 Mar. 0.0339 0.0294 0.0314
18:01-19:00, Tue., 24 Mar. 0.0337 0.0298 0.0319
17:01-18:00, Tue., 24 Mar. 0.0343 0.0298 0.0318
16:01-17:00, Tue., 24 Mar. 0.0341 0.0286 0.0318
15:01-16:00, Tue., 24 Mar. 0.0336 0.0288 0.0316
14:01-15:00, Tue., 24 Mar. 0.0337 0.0294 0.0316
13:01-14:00, Tue., 24 Mar. 0.0346 0.0301 0.0319
12:01-13:00, Tue., 24 Mar. 0.0347 0.0295 0.0320
11:01-12:00, Tue., 24 Mar. 0.0343 0.0296 0.0318
10:01-11:00, Tue., 24 Mar. 0.0342 0.0297 0.0320
09:01-10:00, Tue., 24 Mar. 0.0336 0.0295 0.0318
08:01-09:00, Tue., 24 Mar. 0.0349 0.0297 0.0319
07:01-08:00, Tue., 24 Mar. 0.0346 0.0300 0.0317
06:01-07:00, Tue., 24 Mar. 0.0337 0.0290 0.0316
05:01-06:00, Tue., 24 Mar. 0.0347 0.0297 0.0315
04:01-05:00, Tue., 24 Mar. 0.0339 0.0299 0.0316
03:01-04:00, Tue., 24 Mar. 0.0341 0.0287 0.0315
02:01-03:00, Tue., 24 Mar. 0.0338 0.0289 0.0316
01:01-02:00, Tue., 24 Mar. 0.0336 0.0296 0.0316
00:01-01:00, Tue., 24 Mar. 0.0337 0.0292 0.0314
23:01-24:00, Mon., 23 Mar. 0.0339 0.0293 0.0315
22:01-23:00, Mon., 23 Mar. 0.0340 0.0298 0.0314
21:01-22:00, Mon., 23 Mar. 0.0330 0.0287 0.0312
20:01-21:00, Mon., 23 Mar. 0.0336 0.0295 0.0318
19:01-20:00, Mon., 23 Mar. 0.0339 0.0289 0.0318
18:01-19:00, Mon., 23 Mar. 0.0339 0.0301 0.0316
17:01-18:00, Mon., 23 Mar. 0.0342 0.0297 0.0316
16:01-17:00, Mon., 23 Mar. 0.0347 0.0295 0.0317
15:01-16:00, Mon., 23 Mar. 0.0338 0.0294 0.0314
14:01-15:00, Mon., 23 Mar. 0.0345 0.0298 0.0317
13:01-14:00, Mon., 23 Mar. 0.0349 0.0294 0.0320
12:01-13:00, Mon., 23 Mar. 0.0343 0.0304 0.0323
11:01-12:00, Mon., 23 Mar. 0.0352 0.0306 0.0330
10:01-11:00, Mon., 23 Mar. 0.0377 0.0324 0.0351
09:01-10:00, Mon., 23 Mar. 0.0402 0.0343 0.0366
08:01-09:00, Mon., 23 Mar. 0.0397 0.0346 0.0370
07:01-08:00, Mon., 23 Mar. 0.0399 0.0348 0.0371
06:01-07:00, Mon., 23 Mar. 0.0379 0.0308 0.0346
05:01-06:00, Mon., 23 Mar. 0.0340 0.0298 0.0320
04:01-05:00, Mon., 23 Mar. 0.0347 0.0303 0.0322
03:01-04:00, Mon., 23 Mar. 0.0345 0.0298 0.0324
02:01-03:00, Mon., 23 Mar. 0.0347 0.0310 0.0327
01:01-02:00, Mon., 23 Mar. 0.0347 0.0301 0.0321
00:01-01:00, Mon., 23 Mar. 0.0348 0.0301 0.0319
23:01-24:00, Sun., 22 Mar. 0.0345 0.0298 0.0320
22:01-23:00, Sun., 22 Mar. 0.0345 0.0300 0.0321
21:01-22:00, Sun., 22 Mar. 0.0339 0.0295 0.0318
20:01-21:00, Sun., 22 Mar. 0.0340 0.0289 0.0318
19:01-20:00, Sun., 22 Mar. 0.0342 0.0296 0.0318
18:01-19:00, Sun., 22 Mar. 0.0347 0.0299 0.0319
17:01-18:00, Sun., 22 Mar. 0.0338 0.0291 0.0317
16:01-17:00, Sun., 22 Mar. 0.0352 0.0301 0.0320
15:01-16:00, Sun., 22 Mar. 0.0341 0.0299 0.0321
14:01-15:00, Sun., 22 Mar. 0.0346 0.0305 0.0322
13:01-14:00, Sun., 22 Mar. 0.0343 0.0299 0.0318
12:01-13:00, Sun., 22 Mar. 0.0348 0.0297 0.0322
11:01-12:00, Sun., 22 Mar. 0.0345 0.0308 0.0324
10:01-11:00, Sun., 22 Mar. 0.0345 0.0301 0.0325
09:01-10:00, Sun., 22 Mar. 0.0352 0.0289 0.0325
08:01-09:00, Sun., 22 Mar. 0.0355 0.0301 0.0325
07:01-08:00, Sun., 22 Mar. 0.0349 0.0298 0.0323
06:01-07:00, Sun., 22 Mar. 0.0338 0.0297 0.0319
05:01-06:00, Sun., 22 Mar. 0.0343 0.0301 0.0322
04:01-05:00, Sun., 22 Mar. 0.0344 0.0303 0.0322
03:01-04:00, Sun., 22 Mar. 0.0339 0.0301 0.0317
02:01-03:00, Sun., 22 Mar. 0.0335 0.0295 0.0318
01:01-02:00, Sun., 22 Mar. 0.0337 0.0295 0.0317
00:01-01:00, Sun., 22 Mar. 0.0343 0.0286 0.0318
23:01-24:00, Sat., 21 Mar. 0.0339 0.0295 0.0317
22:01-23:00, Sat., 21 Mar. 0.0341 0.0294 0.0317
21:01-22:00, Sat., 21 Mar. 0.0340 0.0294 0.0317
20:01-21:00, Sat., 21 Mar. 0.0337 0.0294 0.0315
19:01-20:00, Sat., 21 Mar. 0.0339 0.0288 0.0315
18:01-19:00, Sat., 21 Mar. 0.0338 0.0296 0.0318
17:01-18:00, Sat., 21 Mar. 0.0338 0.0295 0.0319
16:01-17:00, Sat., 21 Mar. 0.0349 0.0297 0.0319
15:01-16:00, Sat., 21 Mar. 0.0336 0.0297 0.0317
14:01-15:00, Sat., 21 Mar. 0.0346 0.0301 0.0321
13:01-14:00, Sat., 21 Mar. 0.0342 0.0302 0.0321
12:01-13:00, Sat., 21 Mar. 0.0345 0.0299 0.0320
11:01-12:00, Sat., 21 Mar. 0.0339 0.0304 0.0323
10:01-11:00, Sat., 21 Mar. 0.0343 0.0301 0.0320
09:01-10:00, Sat., 21 Mar. 0.0343 0.0293 0.0319
08:01-09:00, Sat., 21 Mar. 0.0340 0.0292 0.0316
07:01-08:00, Sat., 21 Mar. 0.0353 0.0283 0.0319
06:01-07:00, Sat., 21 Mar. 0.0336 0.0284 0.0315
05:01-06:00, Sat., 21 Mar. 0.0332 0.0294 0.0316
04:01-05:00, Sat., 21 Mar. 0.0342 0.0291 0.0316
03:01-04:00, Sat., 21 Mar. 0.0338 0.0290 0.0314
02:01-03:00, Sat., 21 Mar. 0.0343 0.0296 0.0316
01:01-02:00, Sat., 21 Mar. 0.0339 0.0291 0.0316
00:01-01:00, Sat., 21 Mar. 0.0336 0.0290 0.0315
23:01-24:00, Fri., 20 Mar. 0.0343 0.0297 0.0315
22:01-23:00, Fri., 20 Mar. 0.0336 0.0295 0.0315
21:01-22:00, Fri., 20 Mar. 0.0353 0.0297 0.0317
20:01-21:00, Fri., 20 Mar. 0.0339 0.0298 0.0318
19:01-20:00, Fri., 20 Mar. 0.0337 0.0304 0.0322
18:01-19:00, Fri., 20 Mar. 0.0360 0.0304 0.0334
17:01-18:00, Fri., 20 Mar. 0.0387 0.0315 0.0342
16:01-17:00, Fri., 20 Mar. 0.0342 0.0294 0.0318
15:01-16:00, Fri., 20 Mar. 0.0335 0.0297 0.0316
14:01-15:00, Fri., 20 Mar. 0.0336 0.0299 0.0318
13:01-14:00, Fri., 20 Mar. 0.0353 0.0296 0.0319
12:01-13:00, Fri., 20 Mar. 0.0354 0.0308 0.0326
11:01-12:00, Fri., 20 Mar. 0.0370 0.0312 0.0340
10:01-11:00, Fri., 20 Mar. 0.0398 0.0333 0.0368
09:01-10:00, Fri., 20 Mar. 0.0358 0.0303 0.0328
08:01-09:00, Fri., 20 Mar. 0.0349 0.0297 0.0327
07:01-08:00, Fri., 20 Mar. 0.0368 0.0315 0.0346
06:01-07:00, Fri., 20 Mar. 0.0343 0.0304 0.0326
05:01-06:00, Fri., 20 Mar. 0.0341 0.0298 0.0318
04:01-05:00, Fri., 20 Mar. 0.0351 0.0286 0.0316
03:01-04:00, Fri., 20 Mar. 0.0346 0.0295 0.0318
02:01-03:00, Fri., 20 Mar. 0.0345 0.0293 0.0318
01:01-02:00, Fri., 20 Mar. 0.0357 0.0311 0.0328
00:01-01:00, Fri., 20 Mar. 0.0358 0.0304 0.0336
23:01-24:00, Thu., 19 Mar. 0.0343 0.0294 0.0321
22:01-23:00, Thu., 19 Mar. 0.0345 0.0299 0.0320
21:01-22:00, Thu., 19 Mar. 0.0350 0.0302 0.0322
20:01-21:00, Thu., 19 Mar. 0.0338 0.0304 0.0321
19:01-20:00, Thu., 19 Mar. 0.0356 0.0300 0.0321
18:01-19:00, Thu., 19 Mar. 0.0339 0.0293 0.0319
17:01-18:00, Thu., 19 Mar. 0.0349 0.0297 0.0320
16:01-17:00, Thu., 19 Mar. 0.0346 0.0302 0.0323
15:01-16:00, Thu., 19 Mar. 0.0346 0.0302 0.0324
14:01-15:00, Thu., 19 Mar. 0.0354 0.0296 0.0322
13:01-14:00, Thu., 19 Mar. 0.0353 0.0301 0.0326
12:01-13:00, Thu., 19 Mar. 0.0348 0.0301 0.0326
11:01-12:00, Thu., 19 Mar. 0.0349 0.0295 0.0327
10:01-11:00, Thu., 19 Mar. 0.0352 0.0300 0.0326
09:01-10:00, Thu., 19 Mar. 0.0361 0.0318 0.0338
08:01-09:00, Thu., 19 Mar. 0.0388 0.0326 0.0359
07:01-08:00, Thu., 19 Mar. 0.0452 0.0363 0.0402
06:01-07:00, Thu., 19 Mar. 0.0444 0.0374 0.0410
05:01-06:00, Thu., 19 Mar. 0.0417 0.0308 0.0355
04:01-05:00, Thu., 19 Mar. 0.0350 0.0303 0.0326
03:01-04:00, Thu., 19 Mar. 0.0356 0.0308 0.0331
02:01-03:00, Thu., 19 Mar. 0.0359 0.0301 0.0329
01:01-02:00, Thu., 19 Mar. 0.0343 0.0296 0.0320
00:01-01:00, Thu., 19 Mar. 0.0341 0.0302 0.0320
23:01-24:00, Wed., 18 Mar. 0.0337 0.0290 0.0316
22:01-23:00, Wed., 18 Mar. 0.0345 0.0292 0.0318
21:01-22:00, Wed., 18 Mar. 0.0339 0.0288 0.0317
20:01-21:00, Wed., 18 Mar. 0.0336 0.0287 0.0317
19:01-20:00, Wed., 18 Mar. 0.0346 0.0295 0.0318
18:01-19:00, Wed., 18 Mar. 0.0336 0.0297 0.0317
17:01-18:00, Wed., 18 Mar. 0.0346 0.0287 0.0316
16:01-17:00, Wed., 18 Mar. 0.0343 0.0294 0.0319
15:01-16:00, Wed., 18 Mar. 0.0339 0.0295 0.0314
14:01-15:00, Wed., 18 Mar. 0.0346 0.0300 0.0317
13:01-14:00, Wed., 18 Mar. 0.0337 0.0290 0.0316
12:01-13:00, Wed., 18 Mar. 0.0344 0.0302 0.0318
11:01-12:00, Wed., 18 Mar. 0.0346 0.0299 0.0319
10:01-11:00, Wed., 18 Mar. 0.0340 0.0295 0.0317
09:01-10:00, Wed., 18 Mar. 0.0349 0.0294 0.0320
08:01-09:00, Wed., 18 Mar. 0.0342 0.0292 0.0318
07:01-08:00, Wed., 18 Mar. 0.0340 0.0296 0.0318
06:01-07:00, Wed., 18 Mar. 0.0343 0.0297 0.0319
05:01-06:00, Wed., 18 Mar. 0.0336 0.0293 0.0317
04:01-05:00, Wed., 18 Mar. 0.0338 0.0297 0.0316
03:01-04:00, Wed., 18 Mar. 0.0348 0.0294 0.0318
02:01-03:00, Wed., 18 Mar. 0.0342 0.0297 0.0318
01:01-02:00, Wed., 18 Mar. 0.0339 0.0299 0.0319
00:01-01:00, Wed., 18 Mar. 0.0336 0.0294 0.0316
23:01-24:00, Tue., 17 Mar. 0.0339 0.0289 0.0312
22:01-23:00, Tue., 17 Mar. 0.0340 0.0298 0.0317
21:01-22:00, Tue., 17 Mar. 0.0335 0.0291 0.0315
20:01-21:00, Tue., 17 Mar. 0.0342 0.0291 0.0316
19:01-20:00, Tue., 17 Mar. 0.0334 0.0291 0.0315
18:01-19:00, Tue., 17 Mar. 0.0344 0.0289 0.0313
17:01-18:00, Tue., 17 Mar. 0.0335 0.0294 0.0317
16:01-17:00, Tue., 17 Mar. 0.0346 0.0297 0.0320
15:01-16:00, Tue., 17 Mar. 0.0340 0.0281 0.0311
14:01-15:00, Tue., 17 Mar. 0.0340 0.0293 0.0315
13:01-14:00, Tue., 17 Mar. 0.0338 0.0297 0.0315
12:01-13:00, Tue., 17 Mar. 0.0335 0.0287 0.0317
11:01-12:00, Tue., 17 Mar. 0.0334 0.0283 0.0315