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
19:01-20:00, Fri., 13 Feb. 0.0349 0.0294 0.0315
18:01-19:00, Fri., 13 Feb. 0.0342 0.0293 0.0318
17:01-18:00, Fri., 13 Feb. 0.0341 0.0297 0.0317
16:01-17:00, Fri., 13 Feb. 0.0339 0.0295 0.0318
15:01-16:00, Fri., 13 Feb. 0.0343 0.0291 0.0318
14:01-15:00, Fri., 13 Feb. 0.0343 0.0299 0.0319
13:01-14:00, Fri., 13 Feb. 0.0343 0.0296 0.0321
12:01-13:00, Fri., 13 Feb. 0.0346 0.0296 0.0322
11:01-12:00, Fri., 13 Feb. 0.0341 0.0293 0.0320
10:01-11:00, Fri., 13 Feb. 0.0352 0.0298 0.0323
09:01-10:00, Fri., 13 Feb. 0.0339 0.0304 0.0321
08:01-09:00, Fri., 13 Feb. 0.0347 0.0307 0.0328
07:01-08:00, Fri., 13 Feb. 0.0349 0.0299 0.0325
06:01-07:00, Fri., 13 Feb. 0.0360 0.0304 0.0326
05:01-06:00, Fri., 13 Feb. 0.0349 0.0300 0.0321
04:01-05:00, Fri., 13 Feb. 0.0343 0.0297 0.0322
03:01-04:00, Fri., 13 Feb. 0.0344 0.0304 0.0323
02:01-03:00, Fri., 13 Feb. 0.0337 0.0299 0.0319
01:01-02:00, Fri., 13 Feb. 0.0348 0.0295 0.0320
00:01-01:00, Fri., 13 Feb. 0.0345 0.0296 0.0320
23:01-24:00, Thu., 12 Feb. 0.0339 0.0291 0.0318
22:01-23:00, Thu., 12 Feb. 0.0356 0.0292 0.0320
21:01-22:00, Thu., 12 Feb. 0.0346 0.0297 0.0317
20:01-21:00, Thu., 12 Feb. 0.0339 0.0300 0.0319
19:01-20:00, Thu., 12 Feb. 0.0336 0.0294 0.0317
18:01-19:00, Thu., 12 Feb. 0.0335 0.0291 0.0316
17:01-18:00, Thu., 12 Feb. 0.0336 0.0295 0.0317
16:01-17:00, Thu., 12 Feb. 0.0340 0.0298 0.0319
15:01-16:00, Thu., 12 Feb. 0.0337 0.0287 0.0316
14:01-15:00, Thu., 12 Feb. 0.0342 0.0296 0.0318
13:01-14:00, Thu., 12 Feb. 0.0344 0.0292 0.0316
12:01-13:00, Thu., 12 Feb. 0.0346 0.0291 0.0316
11:01-12:00, Thu., 12 Feb. 0.0339 0.0296 0.0317
10:01-11:00, Thu., 12 Feb. 0.0334 0.0291 0.0317
09:01-10:00, Thu., 12 Feb. 0.0342 0.0294 0.0317
08:01-09:00, Thu., 12 Feb. 0.0343 0.0296 0.0320
07:01-08:00, Thu., 12 Feb. 0.0339 0.0297 0.0318
06:01-07:00, Thu., 12 Feb. 0.0339 0.0295 0.0321
05:01-06:00, Thu., 12 Feb. 0.0342 0.0287 0.0318
04:01-05:00, Thu., 12 Feb. 0.0345 0.0297 0.0318
03:01-04:00, Thu., 12 Feb. 0.0332 0.0292 0.0312
02:01-03:00, Thu., 12 Feb. 0.0325 0.0292 0.0311
01:01-02:00, Thu., 12 Feb. 0.0336 0.0291 0.0313
00:01-01:00, Thu., 12 Feb. 0.0338 0.0297 0.0314
23:01-24:00, Wed., 11 Feb. 0.0330 0.0293 0.0314
22:01-23:00, Wed., 11 Feb. 0.0330 0.0283 0.0313
21:01-22:00, Wed., 11 Feb. 0.0332 0.0287 0.0311
20:01-21:00, Wed., 11 Feb. 0.0341 0.0290 0.0317
19:01-20:00, Wed., 11 Feb. 0.0342 0.0304 0.0323
18:01-19:00, Wed., 11 Feb. 0.0357 0.0304 0.0328
17:01-18:00, Wed., 11 Feb. 0.0363 0.0320 0.0340
16:01-17:00, Wed., 11 Feb. 0.0383 0.0308 0.0338
15:01-16:00, Wed., 11 Feb. 0.0357 0.0302 0.0328
14:01-15:00, Wed., 11 Feb. 0.0370 0.0315 0.0339
13:01-14:00, Wed., 11 Feb. 0.0452 0.0345 0.0393
12:01-13:00, Wed., 11 Feb. 0.0601 0.0445 0.0529
11:01-12:00, Wed., 11 Feb. 0.0594 0.0510 0.0543
10:01-11:00, Wed., 11 Feb. 0.0580 0.0526 0.0551
09:01-10:00, Wed., 11 Feb. 0.0569 0.0454 0.0510
08:01-09:00, Wed., 11 Feb. 0.0471 0.0398 0.0431
07:01-08:00, Wed., 11 Feb. 0.0452 0.0392 0.0421
06:01-07:00, Wed., 11 Feb. 0.0414 0.0359 0.0387
05:01-06:00, Wed., 11 Feb. 0.0370 0.0287 0.0334
04:01-05:00, Wed., 11 Feb. 0.0338 0.0292 0.0315
03:01-04:00, Wed., 11 Feb. 0.0343 0.0304 0.0318
02:01-03:00, Wed., 11 Feb. 0.0332 0.0295 0.0317
01:01-02:00, Wed., 11 Feb. 0.0330 0.0296 0.0314
00:01-01:00, Wed., 11 Feb. 0.0339 0.0290 0.0317
23:01-24:00, Tue., 10 Feb. 0.0349 0.0297 0.0319
22:01-23:00, Tue., 10 Feb. 0.0342 0.0294 0.0318
21:01-22:00, Tue., 10 Feb. 0.0339 0.0297 0.0320
20:01-21:00, Tue., 10 Feb. 0.0339 0.0290 0.0319
19:01-20:00, Tue., 10 Feb. 0.0356 0.0292 0.0319
18:01-19:00, Tue., 10 Feb. 0.0335 0.0294 0.0318
17:01-18:00, Tue., 10 Feb. 0.0346 0.0294 0.0317
16:01-17:00, Tue., 10 Feb. 0.0340 0.0297 0.0317
15:01-16:00, Tue., 10 Feb. 0.0340 0.0282 0.0316
14:01-15:00, Tue., 10 Feb. 0.0337 0.0283 0.0316
13:01-14:00, Tue., 10 Feb. 0.0346 0.0293 0.0317
12:01-13:00, Tue., 10 Feb. 0.0342 0.0296 0.0318
11:01-12:00, Tue., 10 Feb. 0.0338 0.0290 0.0315
10:01-11:00, Tue., 10 Feb. 0.0342 0.0294 0.0315
09:01-10:00, Tue., 10 Feb. 0.0336 0.0290 0.0315
08:01-09:00, Tue., 10 Feb. 0.0329 0.0290 0.0310
07:01-08:00, Tue., 10 Feb. 0.0343 0.0287 0.0312
06:01-07:00, Tue., 10 Feb. 0.0338 0.0298 0.0317
05:01-06:00, Tue., 10 Feb. 0.0331 0.0280 0.0314
04:01-05:00, Tue., 10 Feb. 0.0344 0.0291 0.0313
03:01-04:00, Tue., 10 Feb. 0.0329 0.0288 0.0311
02:01-03:00, Tue., 10 Feb. 0.0329 0.0287 0.0311
01:01-02:00, Tue., 10 Feb. 0.0331 0.0287 0.0310
00:01-01:00, Tue., 10 Feb. 0.0347 0.0288 0.0312
23:01-24:00, Mon., 09 Feb. 0.0330 0.0286 0.0310
22:01-23:00, Mon., 09 Feb. 0.0330 0.0290 0.0312
21:01-22:00, Mon., 09 Feb. 0.0339 0.0290 0.0314
20:01-21:00, Mon., 09 Feb. 0.0329 0.0285 0.0307
19:01-20:00, Mon., 09 Feb. 0.0335 0.0289 0.0309
18:01-19:00, Mon., 09 Feb. 0.0330 0.0292 0.0311
17:01-18:00, Mon., 09 Feb. 0.0343 0.0285 0.0311
16:01-17:00, Mon., 09 Feb. 0.0334 0.0297 0.0314
15:01-16:00, Mon., 09 Feb. 0.0343 0.0294 0.0315
14:01-15:00, Mon., 09 Feb. 0.0336 0.0301 0.0316
13:01-14:00, Mon., 09 Feb. 0.0339 0.0293 0.0315
12:01-13:00, Mon., 09 Feb. 0.0335 0.0295 0.0315
11:01-12:00, Mon., 09 Feb. 0.0339 0.0294 0.0314
10:01-11:00, Mon., 09 Feb. 0.0333 0.0292 0.0312
09:01-10:00, Mon., 09 Feb. 0.0328 0.0284 0.0308
08:01-09:00, Mon., 09 Feb. 0.0357 0.0287 0.0312
07:01-08:00, Mon., 09 Feb. 0.0331 0.0295 0.0313
06:01-07:00, Mon., 09 Feb. 0.0330 0.0287 0.0309
05:01-06:00, Mon., 09 Feb. 0.0338 0.0288 0.0314
04:01-05:00, Mon., 09 Feb. 0.0332 0.0292 0.0312
03:01-04:00, Mon., 09 Feb. 0.0337 0.0294 0.0316
02:01-03:00, Mon., 09 Feb. 0.0339 0.0298 0.0316
01:01-02:00, Mon., 09 Feb. 0.0336 0.0288 0.0311
00:01-01:00, Mon., 09 Feb. 0.0334 0.0294 0.0311
23:01-24:00, Sun., 08 Feb. 0.0339 0.0294 0.0315
22:01-23:00, Sun., 08 Feb. 0.0338 0.0294 0.0314
21:01-22:00, Sun., 08 Feb. 0.0346 0.0292 0.0316
20:01-21:00, Sun., 08 Feb. 0.0346 0.0291 0.0313
19:01-20:00, Sun., 08 Feb. 0.0338 0.0291 0.0310
18:01-19:00, Sun., 08 Feb. 0.0332 0.0295 0.0313
17:01-18:00, Sun., 08 Feb. 0.0340 0.0286 0.0311
16:01-17:00, Sun., 08 Feb. 0.0339 0.0290 0.0314
15:01-16:00, Sun., 08 Feb. 0.0333 0.0287 0.0313
14:01-15:00, Sun., 08 Feb. 0.0344 0.0289 0.0314
13:01-14:00, Sun., 08 Feb. 0.0373 0.0304 0.0329
12:01-13:00, Sun., 08 Feb. 0.0367 0.0311 0.0344
11:01-12:00, Sun., 08 Feb. 0.0385 0.0341 0.0363
10:01-11:00, Sun., 08 Feb. 0.0378 0.0325 0.0355
09:01-10:00, Sun., 08 Feb. 0.0353 0.0319 0.0337
08:01-09:00, Sun., 08 Feb. 0.0376 0.0318 0.0350
07:01-08:00, Sun., 08 Feb. 0.0422 0.0342 0.0382
06:01-07:00, Sun., 08 Feb. 0.0452 0.0333 0.0391
05:01-06:00, Sun., 08 Feb. 0.0383 0.0322 0.0348
04:01-05:00, Sun., 08 Feb. 0.0426 0.0332 0.0382
03:01-04:00, Sun., 08 Feb. 0.0456 0.0367 0.0412
02:01-03:00, Sun., 08 Feb. 0.0408 0.0335 0.0382
01:01-02:00, Sun., 08 Feb. 0.0358 0.0307 0.0332
00:01-01:00, Sun., 08 Feb. 0.0345 0.0304 0.0323
23:01-24:00, Sat., 07 Feb. 0.0350 0.0308 0.0330
22:01-23:00, Sat., 07 Feb. 0.0367 0.0304 0.0339
21:01-22:00, Sat., 07 Feb. 0.0375 0.0315 0.0353
20:01-21:00, Sat., 07 Feb. 0.0364 0.0292 0.0325
19:01-20:00, Sat., 07 Feb. 0.0355 0.0305 0.0323
18:01-19:00, Sat., 07 Feb. 0.0362 0.0304 0.0334
17:01-18:00, Sat., 07 Feb. 0.0404 0.0318 0.0365
16:01-17:00, Sat., 07 Feb. 0.0450 0.0367 0.0412
15:01-16:00, Sat., 07 Feb. 0.0457 0.0395 0.0430
14:01-15:00, Sat., 07 Feb. 0.0410 0.0354 0.0385
13:01-14:00, Sat., 07 Feb. 0.0393 0.0329 0.0358
12:01-13:00, Sat., 07 Feb. 0.0353 0.0295 0.0331
11:01-12:00, Sat., 07 Feb. 0.0356 0.0309 0.0335
10:01-11:00, Sat., 07 Feb. 0.0377 0.0311 0.0343
09:01-10:00, Sat., 07 Feb. 0.0381 0.0325 0.0359
08:01-09:00, Sat., 07 Feb. 0.0356 0.0313 0.0335
07:01-08:00, Sat., 07 Feb. 0.0347 0.0303 0.0324
06:01-07:00, Sat., 07 Feb. 0.0358 0.0304 0.0327
05:01-06:00, Sat., 07 Feb. 0.0352 0.0294 0.0328
04:01-05:00, Sat., 07 Feb. 0.0356 0.0302 0.0324
03:01-04:00, Sat., 07 Feb. 0.0346 0.0308 0.0326
02:01-03:00, Sat., 07 Feb. 0.0339 0.0290 0.0322
01:01-02:00, Sat., 07 Feb. 0.0339 0.0295 0.0322
00:01-01:00, Sat., 07 Feb. 0.0342 0.0305 0.0324
23:01-24:00, Fri., 06 Feb. 0.0344 0.0302 0.0323
22:01-23:00, Fri., 06 Feb. 0.0351 0.0304 0.0325
21:01-22:00, Fri., 06 Feb. 0.0344 0.0308 0.0326
20:01-21:00, Fri., 06 Feb. 0.0356 0.0305 0.0324
19:01-20:00, Fri., 06 Feb. 0.0349 0.0302 0.0326
18:01-19:00, Fri., 06 Feb. 0.0344 0.0295 0.0322
17:01-18:00, Fri., 06 Feb. 0.0341 0.0297 0.0324
16:01-17:00, Fri., 06 Feb. 0.0346 0.0307 0.0325
15:01-16:00, Fri., 06 Feb. 0.0343 0.0299 0.0323
14:01-15:00, Fri., 06 Feb. 0.0350 0.0311 0.0330
13:01-14:00, Fri., 06 Feb. 0.0357 0.0312 0.0332
12:01-13:00, Fri., 06 Feb. 0.0353 0.0315 0.0337
11:01-12:00, Fri., 06 Feb. 0.0356 0.0315 0.0337
10:01-11:00, Fri., 06 Feb. 0.0367 0.0315 0.0335
09:01-10:00, Fri., 06 Feb. 0.0360 0.0308 0.0333
08:01-09:00, Fri., 06 Feb. 0.0363 0.0311 0.0337
07:01-08:00, Fri., 06 Feb. 0.0353 0.0305 0.0332
06:01-07:00, Fri., 06 Feb. 0.0354 0.0305 0.0330
05:01-06:00, Fri., 06 Feb. 0.0354 0.0309 0.0330
04:01-05:00, Fri., 06 Feb. 0.0356 0.0315 0.0331
03:01-04:00, Fri., 06 Feb. 0.0356 0.0298 0.0328
02:01-03:00, Fri., 06 Feb. 0.0355 0.0304 0.0331
01:01-02:00, Fri., 06 Feb. 0.0360 0.0308 0.0331
00:01-01:00, Fri., 06 Feb. 0.0364 0.0304 0.0326
23:01-24:00, Thu., 05 Feb. 0.0353 0.0306 0.0326
22:01-23:00, Thu., 05 Feb. 0.0347 0.0301 0.0325
21:01-22:00, Thu., 05 Feb. 0.0344 0.0307 0.0324
20:01-21:00, Thu., 05 Feb. 0.0346 0.0303 0.0324
19:01-20:00, Thu., 05 Feb. 0.0347 0.0305 0.0327
18:01-19:00, Thu., 05 Feb. 0.0351 0.0304 0.0326
17:01-18:00, Thu., 05 Feb. 0.0344 0.0297 0.0325
16:01-17:00, Thu., 05 Feb. 0.0349 0.0308 0.0327
15:01-16:00, Thu., 05 Feb. 0.0347 0.0302 0.0323
14:01-15:00, Thu., 05 Feb. 0.0356 0.0303 0.0326
13:01-14:00, Thu., 05 Feb. 0.0366 0.0308 0.0330
12:01-13:00, Thu., 05 Feb. 0.0357 0.0311 0.0335
11:01-12:00, Thu., 05 Feb. 0.0366 0.0318 0.0340
10:01-11:00, Thu., 05 Feb. 0.0360 0.0313 0.0336
09:01-10:00, Thu., 05 Feb. 0.0359 0.0314 0.0339
08:01-09:00, Thu., 05 Feb. 0.0370 0.0318 0.0339
07:01-08:00, Thu., 05 Feb. 0.0363 0.0308 0.0336
06:01-07:00, Thu., 05 Feb. 0.0358 0.0301 0.0327
05:01-06:00, Thu., 05 Feb. 0.0354 0.0298 0.0330
04:01-05:00, Thu., 05 Feb. 0.0353 0.0301 0.0328
03:01-04:00, Thu., 05 Feb. 0.0356 0.0312 0.0333
02:01-03:00, Thu., 05 Feb. 0.0343 0.0306 0.0329
01:01-02:00, Thu., 05 Feb. 0.0347 0.0309 0.0329
00:01-01:00, Thu., 05 Feb. 0.0350 0.0312 0.0330
23:01-24:00, Wed., 04 Feb. 0.0346 0.0308 0.0328
22:01-23:00, Wed., 04 Feb. 0.0357 0.0304 0.0326
21:01-22:00, Wed., 04 Feb. 0.0360 0.0304 0.0327
20:01-21:00, Wed., 04 Feb. 0.0355 0.0304 0.0328
19:01-20:00, Wed., 04 Feb. 0.0349 0.0304 0.0323
18:01-19:00, Wed., 04 Feb. 0.0344 0.0291 0.0321
17:01-18:00, Wed., 04 Feb. 0.0346 0.0292 0.0323
16:01-17:00, Wed., 04 Feb. 0.0355 0.0301 0.0323
15:01-16:00, Wed., 04 Feb. 0.0348 0.0303 0.0325
14:01-15:00, Wed., 04 Feb. 0.0343 0.0306 0.0324
13:01-14:00, Wed., 04 Feb. 0.0349 0.0302 0.0327
12:01-13:00, Wed., 04 Feb. 0.0343 0.0307 0.0325
11:01-12:00, Wed., 04 Feb. 0.0353 0.0304 0.0328
10:01-11:00, Wed., 04 Feb. 0.0343 0.0308 0.0325
09:01-10:00, Wed., 04 Feb. 0.0344 0.0302 0.0322
08:01-09:00, Wed., 04 Feb. 0.0355 0.0305 0.0327
07:01-08:00, Wed., 04 Feb. 0.0355 0.0304 0.0328
06:01-07:00, Wed., 04 Feb. 0.0354 0.0303 0.0326
05:01-06:00, Wed., 04 Feb. 0.0348 0.0303 0.0327
04:01-05:00, Wed., 04 Feb. 0.0345 0.0300 0.0320
03:01-04:00, Wed., 04 Feb. 0.0349 0.0297 0.0323
02:01-03:00, Wed., 04 Feb. 0.0352 0.0300 0.0325
01:01-02:00, Wed., 04 Feb. 0.0346 0.0297 0.0323
00:01-01:00, Wed., 04 Feb. 0.0353 0.0297 0.0324
23:01-24:00, Tue., 03 Feb. 0.0340 0.0298 0.0321
22:01-23:00, Tue., 03 Feb. 0.0346 0.0297 0.0322
21:01-22:00, Tue., 03 Feb. 0.0347 0.0294 0.0319
20:01-21:00, Tue., 03 Feb. 0.0348 0.0297 0.0319