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
14:01-15:00, Sun., 23 Feb. 0.0345 0.0294 0.0324
13:01-14:00, Sun., 23 Feb. 0.0345 0.0301 0.0322
12:01-13:00, Sun., 23 Feb. 0.0346 0.0303 0.0324
11:01-12:00, Sun., 23 Feb. 0.0346 0.0301 0.0321
10:01-11:00, Sun., 23 Feb. 0.0337 0.0303 0.0322
09:01-10:00, Sun., 23 Feb. 0.0342 0.0303 0.0319
08:01-09:00, Sun., 23 Feb. 0.0353 0.0302 0.0323
07:01-08:00, Sun., 23 Feb. 0.0344 0.0301 0.0323
06:01-07:00, Sun., 23 Feb. 0.0342 0.0299 0.0323
05:01-06:00, Sun., 23 Feb. 0.0345 0.0297 0.0320
04:01-05:00, Sun., 23 Feb. 0.0341 0.0285 0.0319
03:01-04:00, Sun., 23 Feb. 0.0344 0.0300 0.0321
02:01-03:00, Sun., 23 Feb. 0.0343 0.0292 0.0322
01:01-02:00, Sun., 23 Feb. 0.0343 0.0300 0.0322
00:01-01:00, Sun., 23 Feb. 0.0343 0.0302 0.0324
23:01-24:00, Sat., 22 Feb. 0.0346 0.0303 0.0323
22:01-23:00, Sat., 22 Feb. 0.0343 0.0298 0.0322
21:01-22:00, Sat., 22 Feb. 0.0349 0.0301 0.0324
20:01-21:00, Sat., 22 Feb. 0.0343 0.0304 0.0324
19:01-20:00, Sat., 22 Feb. 0.0340 0.0294 0.0318
18:01-19:00, Sat., 22 Feb. 0.0346 0.0297 0.0319
17:01-18:00, Sat., 22 Feb. 0.0347 0.0304 0.0325
16:01-17:00, Sat., 22 Feb. 0.0343 0.0303 0.0322
15:01-16:00, Sat., 22 Feb. 0.0357 0.0294 0.0328
14:01-15:00, Sat., 22 Feb. 0.0347 0.0306 0.0329
13:01-14:00, Sat., 22 Feb. 0.0361 0.0311 0.0329
12:01-13:00, Sat., 22 Feb. 0.0354 0.0303 0.0326
11:01-12:00, Sat., 22 Feb. 0.0347 0.0310 0.0324
10:01-11:00, Sat., 22 Feb. 0.0346 0.0306 0.0326
09:01-10:00, Sat., 22 Feb. 0.0354 0.0297 0.0321
08:01-09:00, Sat., 22 Feb. 0.0353 0.0305 0.0326
07:01-08:00, Sat., 22 Feb. 0.0357 0.0295 0.0322
06:01-07:00, Sat., 22 Feb. 0.0346 0.0294 0.0322
05:01-06:00, Sat., 22 Feb. 0.0343 0.0292 0.0322
04:01-05:00, Sat., 22 Feb. 0.0341 0.0300 0.0321
03:01-04:00, Sat., 22 Feb. 0.0350 0.0295 0.0325
02:01-03:00, Sat., 22 Feb. 0.0349 0.0299 0.0325
01:01-02:00, Sat., 22 Feb. 0.0351 0.0297 0.0322
00:01-01:00, Sat., 22 Feb. 0.0346 0.0301 0.0320
23:01-24:00, Fri., 21 Feb. 0.0344 0.0298 0.0320
22:01-23:00, Fri., 21 Feb. 0.0344 0.0294 0.0319
21:01-22:00, Fri., 21 Feb. 0.0348 0.0304 0.0322
20:01-21:00, Fri., 21 Feb. 0.0355 0.0304 0.0323
19:01-20:00, Fri., 21 Feb. 0.0346 0.0304 0.0322
18:01-19:00, Fri., 21 Feb. 0.0349 0.0296 0.0323
17:01-18:00, Fri., 21 Feb. 0.0352 0.0299 0.0323
16:01-17:00, Fri., 21 Feb. 0.0350 0.0297 0.0324
15:01-16:00, Fri., 21 Feb. 0.0341 0.0294 0.0322
14:01-15:00, Fri., 21 Feb. 0.0343 0.0302 0.0323
13:01-14:00, Fri., 21 Feb. 0.0348 0.0303 0.0324
12:01-13:00, Fri., 21 Feb. 0.0343 0.0298 0.0325
11:01-12:00, Fri., 21 Feb. 0.0350 0.0306 0.0325
10:01-11:00, Fri., 21 Feb. 0.0342 0.0308 0.0324
09:01-10:00, Fri., 21 Feb. 0.0342 0.0305 0.0322
08:01-09:00, Fri., 21 Feb. 0.0346 0.0300 0.0323
07:01-08:00, Fri., 21 Feb. 0.0343 0.0304 0.0322
06:01-07:00, Fri., 21 Feb. 0.0344 0.0301 0.0322
05:01-06:00, Fri., 21 Feb. 0.0347 0.0301 0.0325
04:01-05:00, Fri., 21 Feb. 0.0345 0.0305 0.0324
03:01-04:00, Fri., 21 Feb. 0.0346 0.0296 0.0325
02:01-03:00, Fri., 21 Feb. 0.0340 0.0303 0.0321
01:01-02:00, Fri., 21 Feb. 0.0344 0.0297 0.0321
00:01-01:00, Fri., 21 Feb. 0.0340 0.0294 0.0322
23:01-24:00, Thu., 20 Feb. 0.0342 0.0298 0.0320
22:01-23:00, Thu., 20 Feb. 0.0349 0.0299 0.0320
21:01-22:00, Thu., 20 Feb. 0.0353 0.0297 0.0319
20:01-21:00, Thu., 20 Feb. 0.0340 0.0302 0.0322
19:01-20:00, Thu., 20 Feb. 0.0339 0.0302 0.0322
18:01-19:00, Thu., 20 Feb. 0.0347 0.0301 0.0322
17:01-18:00, Thu., 20 Feb. 0.0341 0.0300 0.0320
16:01-17:00, Thu., 20 Feb. 0.0342 0.0302 0.0321
15:01-16:00, Thu., 20 Feb. 0.0353 0.0294 0.0321
14:01-15:00, Thu., 20 Feb. 0.0342 0.0298 0.0322
13:01-14:00, Thu., 20 Feb. 0.0346 0.0305 0.0322
12:01-13:00, Thu., 20 Feb. 0.0344 0.0298 0.0321
11:01-12:00, Thu., 20 Feb. 0.0351 0.0302 0.0322
10:01-11:00, Thu., 20 Feb. 0.0354 0.0298 0.0323
09:01-10:00, Thu., 20 Feb. 0.0346 0.0294 0.0321
08:01-09:00, Thu., 20 Feb. 0.0345 0.0304 0.0324
07:01-08:00, Thu., 20 Feb. 0.0344 0.0301 0.0323
06:01-07:00, Thu., 20 Feb. 0.0349 0.0304 0.0322
05:01-06:00, Thu., 20 Feb. 0.0349 0.0299 0.0321
04:01-05:00, Thu., 20 Feb. 0.0347 0.0294 0.0324
03:01-04:00, Thu., 20 Feb. 0.0345 0.0304 0.0323
02:01-03:00, Thu., 20 Feb. 0.0354 0.0297 0.0323
01:01-02:00, Thu., 20 Feb. 0.0350 0.0304 0.0326
00:01-01:00, Thu., 20 Feb. 0.0349 0.0301 0.0322
23:01-24:00, Wed., 19 Feb. 0.0348 0.0294 0.0322
22:01-23:00, Wed., 19 Feb. 0.0343 0.0299 0.0322
21:01-22:00, Wed., 19 Feb. 0.0349 0.0288 0.0321
20:01-21:00, Wed., 19 Feb. 0.0349 0.0296 0.0323
19:01-20:00, Wed., 19 Feb. 0.0338 0.0290 0.0321
18:01-19:00, Wed., 19 Feb. 0.0346 0.0297 0.0319
17:01-18:00, Wed., 19 Feb. 0.0356 0.0294 0.0323
16:01-17:00, Wed., 19 Feb. 0.0337 0.0295 0.0320
15:01-16:00, Wed., 19 Feb. 0.0341 0.0298 0.0321
14:01-15:00, Wed., 19 Feb. 0.0350 0.0297 0.0323
13:01-14:00, Wed., 19 Feb. 0.0364 0.0303 0.0328
12:01-13:00, Wed., 19 Feb. 0.0346 0.0297 0.0325
11:01-12:00, Wed., 19 Feb. 0.0344 0.0309 0.0324
10:01-11:00, Wed., 19 Feb. 0.0351 0.0308 0.0325
09:01-10:00, Wed., 19 Feb. 0.0347 0.0300 0.0323
08:01-09:00, Wed., 19 Feb. 0.0352 0.0299 0.0321
07:01-08:00, Wed., 19 Feb. 0.0356 0.0299 0.0324
06:01-07:00, Wed., 19 Feb. 0.0351 0.0301 0.0326
05:01-06:00, Wed., 19 Feb. 0.0346 0.0302 0.0327
04:01-05:00, Wed., 19 Feb. 0.0357 0.0306 0.0331
03:01-04:00, Wed., 19 Feb. 0.0348 0.0300 0.0327
02:01-03:00, Wed., 19 Feb. 0.0346 0.0303 0.0327
01:01-02:00, Wed., 19 Feb. 0.0350 0.0301 0.0328
00:01-01:00, Wed., 19 Feb. 0.0349 0.0307 0.0329
23:01-24:00, Tue., 18 Feb. 0.0349 0.0296 0.0323
22:01-23:00, Tue., 18 Feb. 0.0352 0.0291 0.0323
21:01-22:00, Tue., 18 Feb. 0.0349 0.0304 0.0325
20:01-21:00, Tue., 18 Feb. 0.0345 0.0303 0.0325
19:01-20:00, Tue., 18 Feb. 0.0347 0.0307 0.0329
18:01-19:00, Tue., 18 Feb. 0.0345 0.0289 0.0326
17:01-18:00, Tue., 18 Feb. 0.0349 0.0298 0.0327
16:01-17:00, Tue., 18 Feb. 0.0346 0.0300 0.0326
15:01-16:00, Tue., 18 Feb. 0.0349 0.0287 0.0327
14:01-15:00, Tue., 18 Feb. 0.0346 0.0311 0.0326
13:01-14:00, Tue., 18 Feb. 0.0350 0.0310 0.0328
12:01-13:00, Tue., 18 Feb. 0.0355 0.0301 0.0327
11:01-12:00, Tue., 18 Feb. 0.0349 0.0304 0.0328
10:01-11:00, Tue., 18 Feb. 0.0350 0.0295 0.0326
09:01-10:00, Tue., 18 Feb. 0.0344 0.0301 0.0323
08:01-09:00, Tue., 18 Feb. 0.0350 0.0297 0.0324
07:01-08:00, Tue., 18 Feb. 0.0361 0.0304 0.0328
06:01-07:00, Tue., 18 Feb. 0.0348 0.0304 0.0325
05:01-06:00, Tue., 18 Feb. 0.0356 0.0309 0.0326
04:01-05:00, Tue., 18 Feb. 0.0356 0.0311 0.0331
03:01-04:00, Tue., 18 Feb. 0.0361 0.0301 0.0332
02:01-03:00, Tue., 18 Feb. 0.0342 0.0295 0.0325
01:01-02:00, Tue., 18 Feb. 0.0356 0.0309 0.0330
00:01-01:00, Tue., 18 Feb. 0.0352 0.0307 0.0332
23:01-24:00, Mon., 17 Feb. 0.0351 0.0304 0.0325
22:01-23:00, Mon., 17 Feb. 0.0347 0.0303 0.0324
21:01-22:00, Mon., 17 Feb. 0.0353 0.0300 0.0330
20:01-21:00, Mon., 17 Feb. 0.0348 0.0297 0.0329
19:01-20:00, Mon., 17 Feb. 0.0355 0.0304 0.0329
18:01-19:00, Mon., 17 Feb. 0.0357 0.0295 0.0331
17:01-18:00, Mon., 17 Feb. 0.0356 0.0309 0.0330
16:01-17:00, Mon., 17 Feb. 0.0360 0.0304 0.0330
15:01-16:00, Mon., 17 Feb. 0.0353 0.0299 0.0334
14:01-15:00, Mon., 17 Feb. 0.0353 0.0302 0.0326
13:01-14:00, Mon., 17 Feb. 0.0349 0.0297 0.0328
12:01-13:00, Mon., 17 Feb. 0.0350 0.0297 0.0330
11:01-12:00, Mon., 17 Feb. 0.0361 0.0312 0.0332
10:01-11:00, Mon., 17 Feb. 0.0354 0.0311 0.0331
09:01-10:00, Mon., 17 Feb. 0.0363 0.0292 0.0329
08:01-09:00, Mon., 17 Feb. 0.0361 0.0304 0.0330
07:01-08:00, Mon., 17 Feb. 0.0363 0.0309 0.0331
06:01-07:00, Mon., 17 Feb. 0.0358 0.0306 0.0332
05:01-06:00, Mon., 17 Feb. 0.0346 0.0303 0.0327
04:01-05:00, Mon., 17 Feb. 0.0357 0.0302 0.0327
03:01-04:00, Mon., 17 Feb. 0.0349 0.0304 0.0328
02:01-03:00, Mon., 17 Feb. 0.0351 0.0301 0.0329
01:01-02:00, Mon., 17 Feb. 0.0346 0.0301 0.0325
00:01-01:00, Mon., 17 Feb. 0.0354 0.0302 0.0328
23:01-24:00, Sun., 16 Feb. 0.0350 0.0301 0.0324
22:01-23:00, Sun., 16 Feb. 0.0345 0.0302 0.0323
21:01-22:00, Sun., 16 Feb. 0.0360 0.0297 0.0325
20:01-21:00, Sun., 16 Feb. 0.0344 0.0301 0.0323
19:01-20:00, Sun., 16 Feb. 0.0347 0.0299 0.0324
18:01-19:00, Sun., 16 Feb. 0.0342 0.0301 0.0325
17:01-18:00, Sun., 16 Feb. 0.0343 0.0300 0.0324
16:01-17:00, Sun., 16 Feb. 0.0350 0.0301 0.0325
15:01-16:00, Sun., 16 Feb. 0.0358 0.0307 0.0325
14:01-15:00, Sun., 16 Feb. 0.0341 0.0311 0.0325
13:01-14:00, Sun., 16 Feb. 0.0348 0.0299 0.0326
12:01-13:00, Sun., 16 Feb. 0.0349 0.0287 0.0327
11:01-12:00, Sun., 16 Feb. 0.0362 0.0304 0.0327
10:01-11:00, Sun., 16 Feb. 0.0353 0.0298 0.0331
09:01-10:00, Sun., 16 Feb. 0.0364 0.0305 0.0335
08:01-09:00, Sun., 16 Feb. 0.0409 0.0333 0.0369
07:01-08:00, Sun., 16 Feb. 0.0436 0.0306 0.0376
06:01-07:00, Sun., 16 Feb. 0.0347 0.0297 0.0325
05:01-06:00, Sun., 16 Feb. 0.0346 0.0303 0.0326
04:01-05:00, Sun., 16 Feb. 0.0352 0.0305 0.0327
03:01-04:00, Sun., 16 Feb. 0.0346 0.0301 0.0325
02:01-03:00, Sun., 16 Feb. 0.0353 0.0291 0.0326
01:01-02:00, Sun., 16 Feb. 0.0344 0.0292 0.0322
00:01-01:00, Sun., 16 Feb. 0.0347 0.0303 0.0322
23:01-24:00, Sat., 15 Feb. 0.0337 0.0299 0.0319
22:01-23:00, Sat., 15 Feb. 0.0348 0.0294 0.0323
21:01-22:00, Sat., 15 Feb. 0.0350 0.0301 0.0320
20:01-21:00, Sat., 15 Feb. 0.0342 0.0298 0.0319
19:01-20:00, Sat., 15 Feb. 0.0341 0.0302 0.0321
18:01-19:00, Sat., 15 Feb. 0.0347 0.0301 0.0320
17:01-18:00, Sat., 15 Feb. 0.0345 0.0294 0.0320
16:01-17:00, Sat., 15 Feb. 0.0336 0.0297 0.0317
15:01-16:00, Sat., 15 Feb. 0.0353 0.0301 0.0322
14:01-15:00, Sat., 15 Feb. 0.0353 0.0303 0.0324
13:01-14:00, Sat., 15 Feb. 0.0344 0.0304 0.0324
12:01-13:00, Sat., 15 Feb. 0.0349 0.0296 0.0324
11:01-12:00, Sat., 15 Feb. 0.0355 0.0304 0.0328
10:01-11:00, Sat., 15 Feb. 0.0350 0.0308 0.0324
09:01-10:00, Sat., 15 Feb. 0.0344 0.0299 0.0321
08:01-09:00, Sat., 15 Feb. 0.0356 0.0298 0.0325
07:01-08:00, Sat., 15 Feb. 0.0340 0.0303 0.0322
06:01-07:00, Sat., 15 Feb. 0.0339 0.0301 0.0322
05:01-06:00, Sat., 15 Feb. 0.0343 0.0301 0.0321
04:01-05:00, Sat., 15 Feb. 0.0343 0.0292 0.0322
03:01-04:00, Sat., 15 Feb. 0.0343 0.0299 0.0322
02:01-03:00, Sat., 15 Feb. 0.0345 0.0302 0.0323
01:01-02:00, Sat., 15 Feb. 0.0351 0.0304 0.0325
00:01-01:00, Sat., 15 Feb. 0.0340 0.0291 0.0321
23:01-24:00, Fri., 14 Feb. 0.0350 0.0304 0.0322
22:01-23:00, Fri., 14 Feb. 0.0352 0.0304 0.0324
21:01-22:00, Fri., 14 Feb. 0.0351 0.0304 0.0324
20:01-21:00, Fri., 14 Feb. 0.0349 0.0298 0.0320
19:01-20:00, Fri., 14 Feb. 0.0351 0.0291 0.0323
18:01-19:00, Fri., 14 Feb. 0.0343 0.0308 0.0325
17:01-18:00, Fri., 14 Feb. 0.0346 0.0303 0.0324
16:01-17:00, Fri., 14 Feb. 0.0349 0.0302 0.0324
15:01-16:00, Fri., 14 Feb. 0.0354 0.0301 0.0323
14:01-15:00, Fri., 14 Feb. 0.0352 0.0293 0.0325
13:01-14:00, Fri., 14 Feb. 0.0349 0.0304 0.0326
12:01-13:00, Fri., 14 Feb. 0.0349 0.0302 0.0328
11:01-12:00, Fri., 14 Feb. 0.0359 0.0304 0.0331
10:01-11:00, Fri., 14 Feb. 0.0349 0.0296 0.0326
09:01-10:00, Fri., 14 Feb. 0.0346 0.0294 0.0326
08:01-09:00, Fri., 14 Feb. 0.0360 0.0311 0.0331
07:01-08:00, Fri., 14 Feb. 0.0353 0.0301 0.0328
06:01-07:00, Fri., 14 Feb. 0.0342 0.0308 0.0323
05:01-06:00, Fri., 14 Feb. 0.0347 0.0301 0.0326
04:01-05:00, Fri., 14 Feb. 0.0353 0.0304 0.0326
03:01-04:00, Fri., 14 Feb. 0.0356 0.0298 0.0322
02:01-03:00, Fri., 14 Feb. 0.0337 0.0300 0.0318
01:01-02:00, Fri., 14 Feb. 0.0349 0.0294 0.0320
00:01-01:00, Fri., 14 Feb. 0.0347 0.0296 0.0322
23:01-24:00, Thu., 13 Feb. 0.0344 0.0304 0.0322
22:01-23:00, Thu., 13 Feb. 0.0339 0.0294 0.0318
21:01-22:00, Thu., 13 Feb. 0.0343 0.0302 0.0322
20:01-21:00, Thu., 13 Feb. 0.0343 0.0299 0.0321
19:01-20:00, Thu., 13 Feb. 0.0353 0.0297 0.0323
18:01-19:00, Thu., 13 Feb. 0.0343 0.0294 0.0322
17:01-18:00, Thu., 13 Feb. 0.0348 0.0308 0.0326
16:01-17:00, Thu., 13 Feb. 0.0357 0.0301 0.0326
15:01-16:00, Thu., 13 Feb. 0.0346 0.0305 0.0324