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
21:01-22:00, Sat., 29 Mar. 0.0339 0.0291 0.0312
20:01-21:00, Sat., 29 Mar. 0.0346 0.0294 0.0323
19:01-20:00, Sat., 29 Mar. 0.0372 0.0305 0.0343
18:01-19:00, Sat., 29 Mar. 0.0410 0.0335 0.0371
17:01-18:00, Sat., 29 Mar. 0.0413 0.0346 0.0382
16:01-17:00, Sat., 29 Mar. 0.0374 0.0318 0.0349
15:01-16:00, Sat., 29 Mar. 0.0421 0.0329 0.0362
14:01-15:00, Sat., 29 Mar. 0.0451 0.0370 0.0406
13:01-14:00, Sat., 29 Mar. 0.0475 0.0388 0.0430
12:01-13:00, Sat., 29 Mar. 0.0484 0.0425 0.0454
11:01-12:00, Sat., 29 Mar. 0.0533 0.0457 0.0498
10:01-11:00, Sat., 29 Mar. 0.0545 0.0385 0.0481
09:01-10:00, Sat., 29 Mar. 0.0581 0.0398 0.0489
08:01-09:00, Sat., 29 Mar. 0.0609 0.0430 0.0528
07:01-08:00, Sat., 29 Mar. 0.0456 0.0377 0.0416
06:01-07:00, Sat., 29 Mar. 0.0457 0.0370 0.0423
05:01-06:00, Sat., 29 Mar. 0.0393 0.0296 0.0351
04:01-05:00, Sat., 29 Mar. 0.0339 0.0296 0.0320
03:01-04:00, Sat., 29 Mar. 0.0349 0.0296 0.0321
02:01-03:00, Sat., 29 Mar. 0.0365 0.0305 0.0336
01:01-02:00, Sat., 29 Mar. 0.0429 0.0337 0.0377
00:01-01:00, Sat., 29 Mar. 0.0449 0.0325 0.0407
23:01-24:00, Fri., 28 Mar. 0.0359 0.0300 0.0325
22:01-23:00, Fri., 28 Mar. 0.0339 0.0295 0.0321
21:01-22:00, Fri., 28 Mar. 0.0343 0.0297 0.0320
20:01-21:00, Fri., 28 Mar. 0.0356 0.0297 0.0321
19:01-20:00, Fri., 28 Mar. 0.0339 0.0297 0.0321
18:01-19:00, Fri., 28 Mar. 0.0340 0.0301 0.0321
17:01-18:00, Fri., 28 Mar. 0.0351 0.0294 0.0320
16:01-17:00, Fri., 28 Mar. 0.0349 0.0302 0.0320
15:01-16:00, Fri., 28 Mar. 0.0338 0.0294 0.0317
14:01-15:00, Fri., 28 Mar. 0.0336 0.0290 0.0315
13:01-14:00, Fri., 28 Mar. 0.0338 0.0294 0.0316
12:01-13:00, Fri., 28 Mar. 0.0341 0.0300 0.0321
11:01-12:00, Fri., 28 Mar. 0.0356 0.0299 0.0334
10:01-11:00, Fri., 28 Mar. 0.0428 0.0331 0.0381
09:01-10:00, Fri., 28 Mar. 0.0583 0.0404 0.0505
08:01-09:00, Fri., 28 Mar. 0.0595 0.0467 0.0546
07:01-08:00, Fri., 28 Mar. 0.0482 0.0332 0.0391
06:01-07:00, Fri., 28 Mar. 0.0360 0.0305 0.0331
05:01-06:00, Fri., 28 Mar. 0.0356 0.0305 0.0324
04:01-05:00, Fri., 28 Mar. 0.0339 0.0304 0.0323
03:01-04:00, Fri., 28 Mar. 0.0349 0.0305 0.0322
02:01-03:00, Fri., 28 Mar. 0.0339 0.0292 0.0319
01:01-02:00, Fri., 28 Mar. 0.0346 0.0299 0.0320
00:01-01:00, Fri., 28 Mar. 0.0345 0.0295 0.0318
23:01-24:00, Thu., 27 Mar. 0.0335 0.0294 0.0319
22:01-23:00, Thu., 27 Mar. 0.0337 0.0291 0.0316
21:01-22:00, Thu., 27 Mar. 0.0346 0.0294 0.0319
20:01-21:00, Thu., 27 Mar. 0.0336 0.0287 0.0317
19:01-20:00, Thu., 27 Mar. 0.0342 0.0297 0.0317
18:01-19:00, Thu., 27 Mar. 0.0350 0.0293 0.0318
17:01-18:00, Thu., 27 Mar. 0.0346 0.0297 0.0321
16:01-17:00, Thu., 27 Mar. 0.0350 0.0305 0.0322
15:01-16:00, Thu., 27 Mar. 0.0341 0.0301 0.0324
14:01-15:00, Thu., 27 Mar. 0.0347 0.0294 0.0325
13:01-14:00, Thu., 27 Mar. 0.0344 0.0304 0.0326
12:01-13:00, Thu., 27 Mar. 0.0350 0.0301 0.0325
11:01-12:00, Thu., 27 Mar. 0.0348 0.0301 0.0324
10:01-11:00, Thu., 27 Mar. 0.0350 0.0300 0.0326
09:01-10:00, Thu., 27 Mar. 0.0345 0.0297 0.0322
08:01-09:00, Thu., 27 Mar. 0.0341 0.0299 0.0324
07:01-08:00, Thu., 27 Mar. 0.0354 0.0304 0.0323
06:01-07:00, Thu., 27 Mar. 0.0347 0.0301 0.0323
05:01-06:00, Thu., 27 Mar. 0.0348 0.0304 0.0326
04:01-05:00, Thu., 27 Mar. 0.0341 0.0302 0.0322
03:01-04:00, Thu., 27 Mar. 0.0346 0.0301 0.0322
02:01-03:00, Thu., 27 Mar. 0.0362 0.0298 0.0323
01:01-02:00, Thu., 27 Mar. 0.0346 0.0301 0.0324
00:01-01:00, Thu., 27 Mar. 0.0353 0.0295 0.0323
23:01-24:00, Wed., 26 Mar. 0.0349 0.0293 0.0323
22:01-23:00, Wed., 26 Mar. 0.0338 0.0302 0.0321
21:01-22:00, Wed., 26 Mar. 0.0347 0.0297 0.0320
20:01-21:00, Wed., 26 Mar. 0.0343 0.0303 0.0324
19:01-20:00, Wed., 26 Mar. 0.0344 0.0307 0.0323
18:01-19:00, Wed., 26 Mar. 0.0347 0.0309 0.0326
17:01-18:00, Wed., 26 Mar. 0.0349 0.0284 0.0322
16:01-17:00, Wed., 26 Mar. 0.0341 0.0297 0.0326
15:01-16:00, Wed., 26 Mar. 0.0356 0.0306 0.0328
14:01-15:00, Wed., 26 Mar. 0.0355 0.0304 0.0329
13:01-14:00, Wed., 26 Mar. 0.0353 0.0304 0.0330
12:01-13:00, Wed., 26 Mar. 0.0354 0.0309 0.0333
11:01-12:00, Wed., 26 Mar. 0.0351 0.0305 0.0331
10:01-11:00, Wed., 26 Mar. 0.0351 0.0297 0.0329
09:01-10:00, Wed., 26 Mar. 0.0358 0.0294 0.0324
08:01-09:00, Wed., 26 Mar. 0.0346 0.0295 0.0326
07:01-08:00, Wed., 26 Mar. 0.0346 0.0294 0.0323
06:01-07:00, Wed., 26 Mar. 0.0355 0.0302 0.0323
05:01-06:00, Wed., 26 Mar. 0.0350 0.0297 0.0323
04:01-05:00, Wed., 26 Mar. 0.0345 0.0298 0.0323
03:01-04:00, Wed., 26 Mar. 0.0347 0.0298 0.0321
02:01-03:00, Wed., 26 Mar. 0.0345 0.0296 0.0322
01:01-02:00, Wed., 26 Mar. 0.0349 0.0304 0.0323
00:01-01:00, Wed., 26 Mar. 0.0352 0.0303 0.0323
23:01-24:00, Tue., 25 Mar. 0.0348 0.0296 0.0322
22:01-23:00, Tue., 25 Mar. 0.0338 0.0294 0.0321
21:01-22:00, Tue., 25 Mar. 0.0343 0.0297 0.0324
20:01-21:00, Tue., 25 Mar. 0.0354 0.0310 0.0326
19:01-20:00, Tue., 25 Mar. 0.0344 0.0304 0.0322
18:01-19:00, Tue., 25 Mar. 0.0347 0.0293 0.0322
17:01-18:00, Tue., 25 Mar. 0.0343 0.0296 0.0321
16:01-17:00, Tue., 25 Mar. 0.0349 0.0304 0.0328
15:01-16:00, Tue., 25 Mar. 0.0350 0.0301 0.0328
14:01-15:00, Tue., 25 Mar. 0.0348 0.0303 0.0327
13:01-14:00, Tue., 25 Mar. 0.0346 0.0307 0.0326
12:01-13:00, Tue., 25 Mar. 0.0348 0.0301 0.0326
11:01-12:00, Tue., 25 Mar. 0.0345 0.0296 0.0324
10:01-11:00, Tue., 25 Mar. 0.0347 0.0299 0.0322
09:01-10:00, Tue., 25 Mar. 0.0339 0.0300 0.0321
08:01-09:00, Tue., 25 Mar. 0.0344 0.0293 0.0321
07:01-08:00, Tue., 25 Mar. 0.0350 0.0299 0.0321
06:01-07:00, Tue., 25 Mar. 0.0343 0.0304 0.0322
05:01-06:00, Tue., 25 Mar. 0.0343 0.0295 0.0319
04:01-05:00, Tue., 25 Mar. 0.0350 0.0299 0.0321
03:01-04:00, Tue., 25 Mar. 0.0336 0.0298 0.0319
02:01-03:00, Tue., 25 Mar. 0.0341 0.0297 0.0321
01:01-02:00, Tue., 25 Mar. 0.0346 0.0302 0.0327
00:01-01:00, Tue., 25 Mar. 0.0365 0.0320 0.0343
23:01-24:00, Mon., 24 Mar. 0.0458 0.0352 0.0400
22:01-23:00, Mon., 24 Mar. 0.0479 0.0315 0.0418
21:01-22:00, Mon., 24 Mar. 0.0346 0.0301 0.0321
20:01-21:00, Mon., 24 Mar. 0.0352 0.0304 0.0322
19:01-20:00, Mon., 24 Mar. 0.0351 0.0301 0.0321
18:01-19:00, Mon., 24 Mar. 0.0341 0.0303 0.0322
17:01-18:00, Mon., 24 Mar. 0.0346 0.0294 0.0316
16:01-17:00, Mon., 24 Mar. 0.0349 0.0296 0.0320
15:01-16:00, Mon., 24 Mar. 0.0354 0.0303 0.0324
14:01-15:00, Mon., 24 Mar. 0.0341 0.0303 0.0321
13:01-14:00, Mon., 24 Mar. 0.0343 0.0305 0.0320
12:01-13:00, Mon., 24 Mar. 0.0347 0.0305 0.0326
11:01-12:00, Mon., 24 Mar. 0.0345 0.0294 0.0321
10:01-11:00, Mon., 24 Mar. 0.0361 0.0298 0.0322
09:01-10:00, Mon., 24 Mar. 0.0343 0.0297 0.0320
08:01-09:00, Mon., 24 Mar. 0.0343 0.0294 0.0322
07:01-08:00, Mon., 24 Mar. 0.0343 0.0296 0.0320
06:01-07:00, Mon., 24 Mar. 0.0341 0.0297 0.0321
05:01-06:00, Mon., 24 Mar. 0.0343 0.0291 0.0316
04:01-05:00, Mon., 24 Mar. 0.0343 0.0299 0.0320
03:01-04:00, Mon., 24 Mar. 0.0341 0.0283 0.0320
02:01-03:00, Mon., 24 Mar. 0.0340 0.0297 0.0321
01:01-02:00, Mon., 24 Mar. 0.0339 0.0301 0.0322
00:01-01:00, Mon., 24 Mar. 0.0343 0.0298 0.0320
23:01-24:00, Sun., 23 Mar. 0.0351 0.0294 0.0323
22:01-23:00, Sun., 23 Mar. 0.0343 0.0297 0.0321
21:01-22:00, Sun., 23 Mar. 0.0341 0.0294 0.0320
20:01-21:00, Sun., 23 Mar. 0.0338 0.0296 0.0321
19:01-20:00, Sun., 23 Mar. 0.0349 0.0291 0.0321
18:01-19:00, Sun., 23 Mar. 0.0350 0.0301 0.0321
17:01-18:00, Sun., 23 Mar. 0.0351 0.0302 0.0322
16:01-17:00, Sun., 23 Mar. 0.0342 0.0304 0.0324
15:01-16:00, Sun., 23 Mar. 0.0349 0.0299 0.0323
14:01-15:00, Sun., 23 Mar. 0.0353 0.0308 0.0326
13:01-14:00, Sun., 23 Mar. 0.0346 0.0309 0.0326
12:01-13:00, Sun., 23 Mar. 0.0356 0.0305 0.0324
11:01-12:00, Sun., 23 Mar. 0.0349 0.0304 0.0326
10:01-11:00, Sun., 23 Mar. 0.0354 0.0300 0.0329
09:01-10:00, Sun., 23 Mar. 0.0351 0.0301 0.0327
08:01-09:00, Sun., 23 Mar. 0.0342 0.0301 0.0323
07:01-08:00, Sun., 23 Mar. 0.0344 0.0306 0.0328
06:01-07:00, Sun., 23 Mar. 0.0353 0.0305 0.0326
05:01-06:00, Sun., 23 Mar. 0.0346 0.0303 0.0324
04:01-05:00, Sun., 23 Mar. 0.0352 0.0294 0.0322
03:01-04:00, Sun., 23 Mar. 0.0346 0.0304 0.0325
02:01-03:00, Sun., 23 Mar. 0.0349 0.0297 0.0321
01:01-02:00, Sun., 23 Mar. 0.0344 0.0296 0.0323
00:01-01:00, Sun., 23 Mar. 0.0351 0.0299 0.0321
23:01-24:00, Sat., 22 Mar. 0.0357 0.0297 0.0323
22:01-23:00, Sat., 22 Mar. 0.0349 0.0298 0.0322
21:01-22:00, Sat., 22 Mar. 0.0341 0.0300 0.0322
20:01-21:00, Sat., 22 Mar. 0.0350 0.0297 0.0323
19:01-20:00, Sat., 22 Mar. 0.0342 0.0298 0.0318
18:01-19:00, Sat., 22 Mar. 0.0339 0.0296 0.0321
17:01-18:00, Sat., 22 Mar. 0.0360 0.0298 0.0324
16:01-17:00, Sat., 22 Mar. 0.0347 0.0306 0.0325
15:01-16:00, Sat., 22 Mar. 0.0349 0.0304 0.0326
14:01-15:00, Sat., 22 Mar. 0.0341 0.0308 0.0328
13:01-14:00, Sat., 22 Mar. 0.0356 0.0308 0.0326
12:01-13:00, Sat., 22 Mar. 0.0353 0.0297 0.0325
11:01-12:00, Sat., 22 Mar. 0.0344 0.0305 0.0324
10:01-11:00, Sat., 22 Mar. 0.0353 0.0303 0.0325
09:01-10:00, Sat., 22 Mar. 0.0359 0.0301 0.0324
08:01-09:00, Sat., 22 Mar. 0.0354 0.0301 0.0325
07:01-08:00, Sat., 22 Mar. 0.0361 0.0301 0.0326
06:01-07:00, Sat., 22 Mar. 0.0346 0.0305 0.0325
05:01-06:00, Sat., 22 Mar. 0.0343 0.0300 0.0322
04:01-05:00, Sat., 22 Mar. 0.0341 0.0304 0.0322
03:01-04:00, Sat., 22 Mar. 0.0357 0.0303 0.0322
02:01-03:00, Sat., 22 Mar. 0.0340 0.0299 0.0322
01:01-02:00, Sat., 22 Mar. 0.0349 0.0293 0.0321
00:01-01:00, Sat., 22 Mar. 0.0348 0.0301 0.0323
23:01-24:00, Fri., 21 Mar. 0.0344 0.0297 0.0323
22:01-23:00, Fri., 21 Mar. 0.0343 0.0301 0.0325
21:01-22:00, Fri., 21 Mar. 0.0349 0.0284 0.0324
20:01-21:00, Fri., 21 Mar. 0.0347 0.0301 0.0323
19:01-20:00, Fri., 21 Mar. 0.0342 0.0305 0.0324
18:01-19:00, Fri., 21 Mar. 0.0348 0.0301 0.0324
17:01-18:00, Fri., 21 Mar. 0.0347 0.0304 0.0321
16:01-17:00, Fri., 21 Mar. 0.0339 0.0300 0.0322
15:01-16:00, Fri., 21 Mar. 0.0367 0.0301 0.0323
14:01-15:00, Fri., 21 Mar. 0.0351 0.0301 0.0324
13:01-14:00, Fri., 21 Mar. 0.0350 0.0301 0.0325
12:01-13:00, Fri., 21 Mar. 0.0348 0.0294 0.0323
11:01-12:00, Fri., 21 Mar. 0.0349 0.0294 0.0322
10:01-11:00, Fri., 21 Mar. 0.0344 0.0299 0.0323
09:01-10:00, Fri., 21 Mar. 0.0342 0.0299 0.0317
08:01-09:00, Fri., 21 Mar. 0.0342 0.0298 0.0315
07:01-08:00, Fri., 21 Mar. 0.0353 0.0298 0.0321
06:01-07:00, Fri., 21 Mar. 0.0349 0.0299 0.0321
05:01-06:00, Fri., 21 Mar. 0.0341 0.0297 0.0319
04:01-05:00, Fri., 21 Mar. 0.0351 0.0305 0.0323
03:01-04:00, Fri., 21 Mar. 0.0350 0.0301 0.0325
02:01-03:00, Fri., 21 Mar. 0.0341 0.0299 0.0316
01:01-02:00, Fri., 21 Mar. 0.0339 0.0291 0.0315
00:01-01:00, Fri., 21 Mar. 0.0339 0.0285 0.0317
23:01-24:00, Thu., 20 Mar. 0.0345 0.0296 0.0319
22:01-23:00, Thu., 20 Mar. 0.0339 0.0294 0.0313
21:01-22:00, Thu., 20 Mar. 0.0338 0.0291 0.0315
20:01-21:00, Thu., 20 Mar. 0.0331 0.0294 0.0314
19:01-20:00, Thu., 20 Mar. 0.0339 0.0283 0.0316
18:01-19:00, Thu., 20 Mar. 0.0338 0.0293 0.0317
17:01-18:00, Thu., 20 Mar. 0.0331 0.0293 0.0316
16:01-17:00, Thu., 20 Mar. 0.0336 0.0296 0.0317
15:01-16:00, Thu., 20 Mar. 0.0330 0.0288 0.0315
14:01-15:00, Thu., 20 Mar. 0.0345 0.0285 0.0316
13:01-14:00, Thu., 20 Mar. 0.0343 0.0297 0.0317
12:01-13:00, Thu., 20 Mar. 0.0349 0.0297 0.0318
11:01-12:00, Thu., 20 Mar. 0.0340 0.0300 0.0320
10:01-11:00, Thu., 20 Mar. 0.0339 0.0295 0.0317
09:01-10:00, Thu., 20 Mar. 0.0335 0.0299 0.0315
08:01-09:00, Thu., 20 Mar. 0.0336 0.0296 0.0316
07:01-08:00, Thu., 20 Mar. 0.0329 0.0298 0.0314
06:01-07:00, Thu., 20 Mar. 0.0342 0.0294 0.0316
05:01-06:00, Thu., 20 Mar. 0.0335 0.0292 0.0316
04:01-05:00, Thu., 20 Mar. 0.0343 0.0295 0.0319
03:01-04:00, Thu., 20 Mar. 0.0334 0.0298 0.0313
02:01-03:00, Thu., 20 Mar. 0.0341 0.0290 0.0313
01:01-02:00, Thu., 20 Mar. 0.0332 0.0293 0.0312
00:01-01:00, Thu., 20 Mar. 0.0340 0.0287 0.0313
23:01-24:00, Wed., 19 Mar. 0.0335 0.0288 0.0313
22:01-23:00, Wed., 19 Mar. 0.0336 0.0297 0.0316