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
04:01-05:00, Fri., 21 Nov. 0.0350 0.0312 0.0333
03:01-04:00, Fri., 21 Nov. 0.0353 0.0305 0.0330
02:01-03:00, Fri., 21 Nov. 0.0349 0.0308 0.0330
01:01-02:00, Fri., 21 Nov. 0.0360 0.0308 0.0330
00:01-01:00, Fri., 21 Nov. 0.0344 0.0304 0.0328
23:01-24:00, Thu., 20 Nov. 0.0353 0.0304 0.0325
22:01-23:00, Thu., 20 Nov. 0.0343 0.0296 0.0321
21:01-22:00, Thu., 20 Nov. 0.0339 0.0302 0.0322
20:01-21:00, Thu., 20 Nov. 0.0349 0.0295 0.0322
19:01-20:00, Thu., 20 Nov. 0.0351 0.0300 0.0325
18:01-19:00, Thu., 20 Nov. 0.0349 0.0299 0.0319
17:01-18:00, Thu., 20 Nov. 0.0342 0.0305 0.0322
16:01-17:00, Thu., 20 Nov. 0.0346 0.0290 0.0322
15:01-16:00, Thu., 20 Nov. 0.0339 0.0287 0.0321
14:01-15:00, Thu., 20 Nov. 0.0341 0.0283 0.0320
13:01-14:00, Thu., 20 Nov. 0.0345 0.0288 0.0324
12:01-13:00, Thu., 20 Nov. 0.0355 0.0304 0.0327
11:01-12:00, Thu., 20 Nov. 0.0349 0.0304 0.0326
10:01-11:00, Thu., 20 Nov. 0.0352 0.0298 0.0326
09:01-10:00, Thu., 20 Nov. 0.0338 0.0292 0.0318
08:01-09:00, Thu., 20 Nov. 0.0344 0.0294 0.0319
07:01-08:00, Thu., 20 Nov. 0.0349 0.0305 0.0328
06:01-07:00, Thu., 20 Nov. 0.0363 0.0315 0.0341
05:01-06:00, Thu., 20 Nov. 0.0411 0.0337 0.0368
04:01-05:00, Thu., 20 Nov. 0.0419 0.0324 0.0369
03:01-04:00, Thu., 20 Nov. 0.0349 0.0300 0.0323
02:01-03:00, Thu., 20 Nov. 0.0353 0.0297 0.0322
01:01-02:00, Thu., 20 Nov. 0.0352 0.0286 0.0321
00:01-01:00, Thu., 20 Nov. 0.0352 0.0302 0.0321
23:01-24:00, Wed., 19 Nov. 0.0346 0.0301 0.0322
22:01-23:00, Wed., 19 Nov. 0.0347 0.0299 0.0323
21:01-22:00, Wed., 19 Nov. 0.0353 0.0290 0.0321
20:01-21:00, Wed., 19 Nov. 0.0346 0.0299 0.0320
19:01-20:00, Wed., 19 Nov. 0.0343 0.0302 0.0318
18:01-19:00, Wed., 19 Nov. 0.0351 0.0296 0.0319
17:01-18:00, Wed., 19 Nov. 0.0352 0.0290 0.0316
16:01-17:00, Wed., 19 Nov. 0.0344 0.0297 0.0319
15:01-16:00, Wed., 19 Nov. 0.0345 0.0295 0.0319
14:01-15:00, Wed., 19 Nov. 0.0336 0.0295 0.0319
13:01-14:00, Wed., 19 Nov. 0.0350 0.0301 0.0321
12:01-13:00, Wed., 19 Nov. 0.0346 0.0302 0.0325
11:01-12:00, Wed., 19 Nov. 0.0344 0.0296 0.0322
10:01-11:00, Wed., 19 Nov. 0.0346 0.0299 0.0323
09:01-10:00, Wed., 19 Nov. 0.0342 0.0301 0.0321
08:01-09:00, Wed., 19 Nov. 0.0343 0.0292 0.0324
07:01-08:00, Wed., 19 Nov. 0.0346 0.0290 0.0323
06:01-07:00, Wed., 19 Nov. 0.0347 0.0298 0.0321
05:01-06:00, Wed., 19 Nov. 0.0343 0.0300 0.0324
04:01-05:00, Wed., 19 Nov. 0.0346 0.0303 0.0323
03:01-04:00, Wed., 19 Nov. 0.0353 0.0296 0.0325
02:01-03:00, Wed., 19 Nov. 0.0353 0.0297 0.0325
01:01-02:00, Wed., 19 Nov. 0.0346 0.0296 0.0325
00:01-01:00, Wed., 19 Nov. 0.0340 0.0300 0.0323
23:01-24:00, Tue., 18 Nov. 0.0353 0.0303 0.0322
22:01-23:00, Tue., 18 Nov. 0.0352 0.0303 0.0325
21:01-22:00, Tue., 18 Nov. 0.0363 0.0294 0.0328
20:01-21:00, Tue., 18 Nov. 0.0353 0.0304 0.0333
19:01-20:00, Tue., 18 Nov. 0.0358 0.0308 0.0336
18:01-19:00, Tue., 18 Nov. 0.0370 0.0314 0.0338
17:01-18:00, Tue., 18 Nov. 0.0361 0.0311 0.0336
16:01-17:00, Tue., 18 Nov. 0.0356 0.0308 0.0334
15:01-16:00, Tue., 18 Nov. 0.0363 0.0301 0.0331
14:01-15:00, Tue., 18 Nov. 0.0351 0.0303 0.0328
13:01-14:00, Tue., 18 Nov. 0.0353 0.0308 0.0330
12:01-13:00, Tue., 18 Nov. 0.0353 0.0310 0.0331
11:01-12:00, Tue., 18 Nov. 0.0353 0.0309 0.0331
10:01-11:00, Tue., 18 Nov. 0.0353 0.0311 0.0331
09:01-10:00, Tue., 18 Nov. 0.0359 0.0304 0.0329
08:01-09:00, Tue., 18 Nov. 0.0346 0.0290 0.0323
07:01-08:00, Tue., 18 Nov. 0.0351 0.0310 0.0326
06:01-07:00, Tue., 18 Nov. 0.0349 0.0307 0.0326
05:01-06:00, Tue., 18 Nov. 0.0346 0.0301 0.0327
04:01-05:00, Tue., 18 Nov. 0.0348 0.0304 0.0325
03:01-04:00, Tue., 18 Nov. 0.0357 0.0297 0.0326
02:01-03:00, Tue., 18 Nov. 0.0353 0.0299 0.0327
01:01-02:00, Tue., 18 Nov. 0.0349 0.0298 0.0324
00:01-01:00, Tue., 18 Nov. 0.0354 0.0299 0.0325
23:01-24:00, Mon., 17 Nov. 0.0347 0.0294 0.0324
22:01-23:00, Mon., 17 Nov. 0.0349 0.0299 0.0325
21:01-22:00, Mon., 17 Nov. 0.0346 0.0304 0.0324
20:01-21:00, Mon., 17 Nov. 0.0350 0.0305 0.0322
19:01-20:00, Mon., 17 Nov. 0.0349 0.0293 0.0322
18:01-19:00, Mon., 17 Nov. 0.0348 0.0300 0.0325
17:01-18:00, Mon., 17 Nov. 0.0336 0.0288 0.0320
16:01-17:00, Mon., 17 Nov. 0.0345 0.0294 0.0320
15:01-16:00, Mon., 17 Nov. 0.0343 0.0294 0.0318
14:01-15:00, Mon., 17 Nov. 0.0333 0.0287 0.0310
13:01-14:00, Mon., 17 Nov. 0.0340 0.0294 0.0313
12:01-13:00, Mon., 17 Nov. 0.0343 0.0299 0.0319
11:01-12:00, Mon., 17 Nov. 0.0339 0.0297 0.0317
10:01-11:00, Mon., 17 Nov. 0.0336 0.0290 0.0319
09:01-10:00, Mon., 17 Nov. 0.0351 0.0296 0.0322
08:01-09:00, Mon., 17 Nov. 0.0349 0.0299 0.0329
07:01-08:00, Mon., 17 Nov. 0.0354 0.0297 0.0330
06:01-07:00, Mon., 17 Nov. 0.0349 0.0303 0.0326
05:01-06:00, Mon., 17 Nov. 0.0352 0.0308 0.0329
04:01-05:00, Mon., 17 Nov. 0.0353 0.0302 0.0327
03:01-04:00, Mon., 17 Nov. 0.0346 0.0305 0.0324
02:01-03:00, Mon., 17 Nov. 0.0358 0.0302 0.0325
01:01-02:00, Mon., 17 Nov. 0.0346 0.0301 0.0322
00:01-01:00, Mon., 17 Nov. 0.0346 0.0301 0.0321
23:01-24:00, Sun., 16 Nov. 0.0346 0.0295 0.0320
22:01-23:00, Sun., 16 Nov. 0.0341 0.0300 0.0321
21:01-22:00, Sun., 16 Nov. 0.0342 0.0292 0.0318
20:01-21:00, Sun., 16 Nov. 0.0342 0.0298 0.0320
19:01-20:00, Sun., 16 Nov. 0.0347 0.0301 0.0319
18:01-19:00, Sun., 16 Nov. 0.0345 0.0294 0.0318
17:01-18:00, Sun., 16 Nov. 0.0344 0.0298 0.0316
16:01-17:00, Sun., 16 Nov. 0.0342 0.0295 0.0318
15:01-16:00, Sun., 16 Nov. 0.0347 0.0294 0.0321
14:01-15:00, Sun., 16 Nov. 0.0345 0.0289 0.0319
13:01-14:00, Sun., 16 Nov. 0.0343 0.0296 0.0320
12:01-13:00, Sun., 16 Nov. 0.0349 0.0300 0.0323
11:01-12:00, Sun., 16 Nov. 0.0345 0.0297 0.0320
10:01-11:00, Sun., 16 Nov. 0.0348 0.0307 0.0325
09:01-10:00, Sun., 16 Nov. 0.0346 0.0306 0.0327
08:01-09:00, Sun., 16 Nov. 0.0350 0.0304 0.0328
07:01-08:00, Sun., 16 Nov. 0.0348 0.0302 0.0324
06:01-07:00, Sun., 16 Nov. 0.0349 0.0302 0.0323
05:01-06:00, Sun., 16 Nov. 0.0346 0.0290 0.0320
04:01-05:00, Sun., 16 Nov. 0.0350 0.0294 0.0320
03:01-04:00, Sun., 16 Nov. 0.0332 0.0297 0.0319
02:01-03:00, Sun., 16 Nov. 0.0347 0.0295 0.0318
01:01-02:00, Sun., 16 Nov. 0.0336 0.0301 0.0320
00:01-01:00, Sun., 16 Nov. 0.0346 0.0298 0.0322
23:01-24:00, Sat., 15 Nov. 0.0341 0.0289 0.0320
22:01-23:00, Sat., 15 Nov. 0.0340 0.0302 0.0321
21:01-22:00, Sat., 15 Nov. 0.0340 0.0297 0.0320
20:01-21:00, Sat., 15 Nov. 0.0333 0.0294 0.0316
19:01-20:00, Sat., 15 Nov. 0.0336 0.0300 0.0317
18:01-19:00, Sat., 15 Nov. 0.0349 0.0293 0.0319
17:01-18:00, Sat., 15 Nov. 0.0338 0.0294 0.0319
16:01-17:00, Sat., 15 Nov. 0.0354 0.0298 0.0318
15:01-16:00, Sat., 15 Nov. 0.0341 0.0300 0.0321
14:01-15:00, Sat., 15 Nov. 0.0346 0.0299 0.0320
13:01-14:00, Sat., 15 Nov. 0.0344 0.0300 0.0321
12:01-13:00, Sat., 15 Nov. 0.0346 0.0295 0.0318
11:01-12:00, Sat., 15 Nov. 0.0341 0.0304 0.0319
10:01-11:00, Sat., 15 Nov. 0.0343 0.0297 0.0320
09:01-10:00, Sat., 15 Nov. 0.0340 0.0285 0.0319
08:01-09:00, Sat., 15 Nov. 0.0341 0.0303 0.0321
07:01-08:00, Sat., 15 Nov. 0.0349 0.0304 0.0324
06:01-07:00, Sat., 15 Nov. 0.0345 0.0308 0.0323
05:01-06:00, Sat., 15 Nov. 0.0347 0.0301 0.0323
04:01-05:00, Sat., 15 Nov. 0.0348 0.0296 0.0322
03:01-04:00, Sat., 15 Nov. 0.0344 0.0289 0.0321
02:01-03:00, Sat., 15 Nov. 0.0353 0.0299 0.0325
01:01-02:00, Sat., 15 Nov. 0.0353 0.0300 0.0322
00:01-01:00, Sat., 15 Nov. 0.0346 0.0294 0.0320
23:01-24:00, Fri., 14 Nov. 0.0346 0.0284 0.0320
22:01-23:00, Fri., 14 Nov. 0.0338 0.0294 0.0317
21:01-22:00, Fri., 14 Nov. 0.0337 0.0299 0.0318
20:01-21:00, Fri., 14 Nov. 0.0338 0.0295 0.0321
19:01-20:00, Fri., 14 Nov. 0.0346 0.0301 0.0321
18:01-19:00, Fri., 14 Nov. 0.0336 0.0285 0.0317
17:01-18:00, Fri., 14 Nov. 0.0348 0.0294 0.0318
16:01-17:00, Fri., 14 Nov. 0.0353 0.0295 0.0321
15:01-16:00, Fri., 14 Nov. 0.0357 0.0297 0.0322
14:01-15:00, Fri., 14 Nov. 0.0347 0.0303 0.0320
13:01-14:00, Fri., 14 Nov. 0.0346 0.0299 0.0320
12:01-13:00, Fri., 14 Nov. 0.0339 0.0296 0.0319
11:01-12:00, Fri., 14 Nov. 0.0346 0.0300 0.0323
10:01-11:00, Fri., 14 Nov. 0.0344 0.0299 0.0319
09:01-10:00, Fri., 14 Nov. 0.0351 0.0298 0.0317
08:01-09:00, Fri., 14 Nov. 0.0347 0.0301 0.0326
07:01-08:00, Fri., 14 Nov. 0.0348 0.0311 0.0325
06:01-07:00, Fri., 14 Nov. 0.0348 0.0303 0.0329
05:01-06:00, Fri., 14 Nov. 0.0353 0.0298 0.0328
04:01-05:00, Fri., 14 Nov. 0.0358 0.0310 0.0333
03:01-04:00, Fri., 14 Nov. 0.0354 0.0311 0.0330
02:01-03:00, Fri., 14 Nov. 0.0348 0.0311 0.0331
01:01-02:00, Fri., 14 Nov. 0.0348 0.0308 0.0326
00:01-01:00, Fri., 14 Nov. 0.0354 0.0308 0.0329
23:01-24:00, Thu., 13 Nov. 0.0356 0.0303 0.0330
22:01-23:00, Thu., 13 Nov. 0.0352 0.0306 0.0325
21:01-22:00, Thu., 13 Nov. 0.0348 0.0312 0.0330
20:01-21:00, Thu., 13 Nov. 0.0355 0.0303 0.0326
19:01-20:00, Thu., 13 Nov. 0.0352 0.0304 0.0325
18:01-19:00, Thu., 13 Nov. 0.0352 0.0298 0.0331
17:01-18:00, Thu., 13 Nov. 0.0358 0.0304 0.0331
16:01-17:00, Thu., 13 Nov. 0.0346 0.0306 0.0326
15:01-16:00, Thu., 13 Nov. 0.0362 0.0301 0.0328
14:01-15:00, Thu., 13 Nov. 0.0349 0.0305 0.0327
13:01-14:00, Thu., 13 Nov. 0.0355 0.0305 0.0328
12:01-13:00, Thu., 13 Nov. 0.0356 0.0301 0.0335
11:01-12:00, Thu., 13 Nov. 0.0363 0.0303 0.0342
10:01-11:00, Thu., 13 Nov. 0.0357 0.0305 0.0331
09:01-10:00, Thu., 13 Nov. 0.0348 0.0294 0.0326
08:01-09:00, Thu., 13 Nov. 0.0355 0.0304 0.0328
07:01-08:00, Thu., 13 Nov. 0.0346 0.0301 0.0326
06:01-07:00, Thu., 13 Nov. 0.0353 0.0294 0.0326
05:01-06:00, Thu., 13 Nov. 0.0346 0.0304 0.0323
04:01-05:00, Thu., 13 Nov. 0.0357 0.0301 0.0323
03:01-04:00, Thu., 13 Nov. 0.0349 0.0304 0.0326
02:01-03:00, Thu., 13 Nov. 0.0341 0.0297 0.0323
01:01-02:00, Thu., 13 Nov. 0.0345 0.0302 0.0325
00:01-01:00, Thu., 13 Nov. 0.0347 0.0298 0.0322
23:01-24:00, Wed., 12 Nov. 0.0346 0.0298 0.0318
22:01-23:00, Wed., 12 Nov. 0.0336 0.0301 0.0317
21:01-22:00, Wed., 12 Nov. 0.0340 0.0292 0.0319
20:01-21:00, Wed., 12 Nov. 0.0334 0.0298 0.0316
19:01-20:00, Wed., 12 Nov. 0.0346 0.0285 0.0316
18:01-19:00, Wed., 12 Nov. 0.0336 0.0297 0.0318
17:01-18:00, Wed., 12 Nov. 0.0345 0.0294 0.0317
16:01-17:00, Wed., 12 Nov. 0.0343 0.0295 0.0316
15:01-16:00, Wed., 12 Nov. 0.0342 0.0291 0.0322
14:01-15:00, Wed., 12 Nov. 0.0347 0.0294 0.0319
13:01-14:00, Wed., 12 Nov. 0.0342 0.0298 0.0320
12:01-13:00, Wed., 12 Nov. 0.0339 0.0297 0.0318
11:01-12:00, Wed., 12 Nov. 0.0343 0.0299 0.0322
10:01-11:00, Wed., 12 Nov. 0.0339 0.0291 0.0319
09:01-10:00, Wed., 12 Nov. 0.0350 0.0297 0.0319
08:01-09:00, Wed., 12 Nov. 0.0340 0.0295 0.0318
07:01-08:00, Wed., 12 Nov. 0.0346 0.0294 0.0318
06:01-07:00, Wed., 12 Nov. 0.0340 0.0300 0.0317
05:01-06:00, Wed., 12 Nov. 0.0338 0.0298 0.0319
04:01-05:00, Wed., 12 Nov. 0.0336 0.0289 0.0314
03:01-04:00, Wed., 12 Nov. 0.0341 0.0287 0.0317
02:01-03:00, Wed., 12 Nov. 0.0339 0.0297 0.0318
01:01-02:00, Wed., 12 Nov. 0.0338 0.0290 0.0318
00:01-01:00, Wed., 12 Nov. 0.0341 0.0294 0.0316
23:01-24:00, Tue., 11 Nov. 0.0335 0.0292 0.0316
22:01-23:00, Tue., 11 Nov. 0.0346 0.0294 0.0319
21:01-22:00, Tue., 11 Nov. 0.0346 0.0303 0.0322
20:01-21:00, Tue., 11 Nov. 0.0349 0.0295 0.0323
19:01-20:00, Tue., 11 Nov. 0.0337 0.0301 0.0320
18:01-19:00, Tue., 11 Nov. 0.0345 0.0298 0.0321
17:01-18:00, Tue., 11 Nov. 0.0343 0.0294 0.0318
16:01-17:00, Tue., 11 Nov. 0.0353 0.0293 0.0322
15:01-16:00, Tue., 11 Nov. 0.0343 0.0299 0.0323
14:01-15:00, Tue., 11 Nov. 0.0341 0.0304 0.0323
13:01-14:00, Tue., 11 Nov. 0.0345 0.0304 0.0321
12:01-13:00, Tue., 11 Nov. 0.0346 0.0305 0.0322
11:01-12:00, Tue., 11 Nov. 0.0343 0.0297 0.0321
10:01-11:00, Tue., 11 Nov. 0.0353 0.0294 0.0320
09:01-10:00, Tue., 11 Nov. 0.0353 0.0299 0.0322
08:01-09:00, Tue., 11 Nov. 0.0349 0.0289 0.0323
07:01-08:00, Tue., 11 Nov. 0.0354 0.0305 0.0324
06:01-07:00, Tue., 11 Nov. 0.0346 0.0301 0.0322
05:01-06:00, Tue., 11 Nov. 0.0346 0.0298 0.0320