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.

News about this monitoring post

Due to a power outage at our center due to statutory inspection of electrical equipment, we will temporarily suspend updating of monitoring post measurement values ​​from 8:00 to 19:00 on Saturday, October 18, 2025.

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., 11 Oct. 0.0374 0.0329 0.0350
20:01-21:00, Sat., 11 Oct. 0.0393 0.0339 0.0369
19:01-20:00, Sat., 11 Oct. 0.0410 0.0352 0.0377
18:01-19:00, Sat., 11 Oct. 0.0397 0.0348 0.0374
17:01-18:00, Sat., 11 Oct. 0.0428 0.0358 0.0396
16:01-17:00, Sat., 11 Oct. 0.0436 0.0362 0.0395
15:01-16:00, Sat., 11 Oct. 0.0451 0.0358 0.0401
14:01-15:00, Sat., 11 Oct. 0.0502 0.0429 0.0465
13:01-14:00, Sat., 11 Oct. 0.0523 0.0459 0.0493
12:01-13:00, Sat., 11 Oct. 0.0527 0.0464 0.0495
11:01-12:00, Sat., 11 Oct. 0.0501 0.0364 0.0434
10:01-11:00, Sat., 11 Oct. 0.0485 0.0397 0.0439
09:01-10:00, Sat., 11 Oct. 0.0488 0.0413 0.0445
08:01-09:00, Sat., 11 Oct. 0.0481 0.0357 0.0426
07:01-08:00, Sat., 11 Oct. 0.0392 0.0339 0.0365
06:01-07:00, Sat., 11 Oct. 0.0365 0.0311 0.0333
05:01-06:00, Sat., 11 Oct. 0.0349 0.0308 0.0329
04:01-05:00, Sat., 11 Oct. 0.0358 0.0311 0.0335
03:01-04:00, Sat., 11 Oct. 0.0360 0.0311 0.0336
02:01-03:00, Sat., 11 Oct. 0.0356 0.0314 0.0337
01:01-02:00, Sat., 11 Oct. 0.0359 0.0306 0.0331
00:01-01:00, Sat., 11 Oct. 0.0359 0.0305 0.0331
23:01-24:00, Fri., 10 Oct. 0.0353 0.0311 0.0329
22:01-23:00, Fri., 10 Oct. 0.0343 0.0308 0.0326
21:01-22:00, Fri., 10 Oct. 0.0355 0.0308 0.0329
20:01-21:00, Fri., 10 Oct. 0.0358 0.0310 0.0328
19:01-20:00, Fri., 10 Oct. 0.0345 0.0310 0.0329
18:01-19:00, Fri., 10 Oct. 0.0352 0.0308 0.0328
17:01-18:00, Fri., 10 Oct. 0.0343 0.0297 0.0326
16:01-17:00, Fri., 10 Oct. 0.0349 0.0304 0.0329
15:01-16:00, Fri., 10 Oct. 0.0361 0.0311 0.0334
14:01-15:00, Fri., 10 Oct. 0.0365 0.0311 0.0332
13:01-14:00, Fri., 10 Oct. 0.0812 0.0313 0.0343
12:01-13:00, Fri., 10 Oct. 0.0360 0.0310 0.0334
11:01-12:00, Fri., 10 Oct. 0.0352 0.0311 0.0332
10:01-11:00, Fri., 10 Oct. 0.0362 0.0290 0.0330
09:01-10:00, Fri., 10 Oct. 0.0355 0.0304 0.0331
08:01-09:00, Fri., 10 Oct. 0.0354 0.0311 0.0328
07:01-08:00, Fri., 10 Oct. 0.0353 0.0314 0.0331
06:01-07:00, Fri., 10 Oct. 0.0353 0.0310 0.0331
05:01-06:00, Fri., 10 Oct. 0.0354 0.0308 0.0330
04:01-05:00, Fri., 10 Oct. 0.0353 0.0304 0.0333
03:01-04:00, Fri., 10 Oct. 0.0361 0.0315 0.0333
02:01-03:00, Fri., 10 Oct. 0.0356 0.0313 0.0335
01:01-02:00, Fri., 10 Oct. 0.0353 0.0311 0.0333
00:01-01:00, Fri., 10 Oct. 0.0356 0.0311 0.0334
23:01-24:00, Thu., 09 Oct. 0.0347 0.0301 0.0329
22:01-23:00, Thu., 09 Oct. 0.0356 0.0314 0.0333
21:01-22:00, Thu., 09 Oct. 0.0356 0.0307 0.0331
20:01-21:00, Thu., 09 Oct. 0.0352 0.0310 0.0330
19:01-20:00, Thu., 09 Oct. 0.0358 0.0305 0.0328
18:01-19:00, Thu., 09 Oct. 0.0351 0.0305 0.0329
17:01-18:00, Thu., 09 Oct. 0.0351 0.0296 0.0329
16:01-17:00, Thu., 09 Oct. 0.0361 0.0297 0.0329
15:01-16:00, Thu., 09 Oct. 0.0352 0.0308 0.0331
14:01-15:00, Thu., 09 Oct. 0.0349 0.0301 0.0330
13:01-14:00, Thu., 09 Oct. 0.0353 0.0305 0.0329
12:01-13:00, Thu., 09 Oct. 0.0353 0.0301 0.0331
11:01-12:00, Thu., 09 Oct. 0.0349 0.0307 0.0328
10:01-11:00, Thu., 09 Oct. 0.0364 0.0308 0.0332
09:01-10:00, Thu., 09 Oct. 0.0350 0.0299 0.0324
08:01-09:00, Thu., 09 Oct. 0.0345 0.0300 0.0328
07:01-08:00, Thu., 09 Oct. 0.0349 0.0302 0.0327
06:01-07:00, Thu., 09 Oct. 0.0349 0.0289 0.0327
05:01-06:00, Thu., 09 Oct. 0.0349 0.0306 0.0325
04:01-05:00, Thu., 09 Oct. 0.0346 0.0301 0.0326
03:01-04:00, Thu., 09 Oct. 0.0351 0.0313 0.0331
02:01-03:00, Thu., 09 Oct. 0.0355 0.0304 0.0329
01:01-02:00, Thu., 09 Oct. 0.0353 0.0315 0.0332
00:01-01:00, Thu., 09 Oct. 0.0357 0.0310 0.0332
23:01-24:00, Wed., 08 Oct. 0.0350 0.0308 0.0330
22:01-23:00, Wed., 08 Oct. 0.0345 0.0291 0.0326
21:01-22:00, Wed., 08 Oct. 0.0349 0.0301 0.0328
20:01-21:00, Wed., 08 Oct. 0.0346 0.0303 0.0325
19:01-20:00, Wed., 08 Oct. 0.0350 0.0301 0.0326
18:01-19:00, Wed., 08 Oct. 0.0346 0.0298 0.0323
17:01-18:00, Wed., 08 Oct. 0.0353 0.0301 0.0326
16:01-17:00, Wed., 08 Oct. 0.0376 0.0306 0.0328
15:01-16:00, Wed., 08 Oct. 0.0349 0.0304 0.0329
14:01-15:00, Wed., 08 Oct. 0.0345 0.0304 0.0326
13:01-14:00, Wed., 08 Oct. 0.0343 0.0306 0.0326
12:01-13:00, Wed., 08 Oct. 0.0349 0.0311 0.0328
11:01-12:00, Wed., 08 Oct. 0.0349 0.0302 0.0329
10:01-11:00, Wed., 08 Oct. 0.0353 0.0302 0.0327
09:01-10:00, Wed., 08 Oct. 0.0353 0.0307 0.0327
08:01-09:00, Wed., 08 Oct. 0.0356 0.0301 0.0329
07:01-08:00, Wed., 08 Oct. 0.0351 0.0294 0.0327
06:01-07:00, Wed., 08 Oct. 0.0356 0.0304 0.0327
05:01-06:00, Wed., 08 Oct. 0.0351 0.0305 0.0329
04:01-05:00, Wed., 08 Oct. 0.0346 0.0306 0.0324
03:01-04:00, Wed., 08 Oct. 0.0353 0.0305 0.0326
02:01-03:00, Wed., 08 Oct. 0.0346 0.0298 0.0324
01:01-02:00, Wed., 08 Oct. 0.0346 0.0301 0.0324
00:01-01:00, Wed., 08 Oct. 0.0349 0.0293 0.0326
23:01-24:00, Tue., 07 Oct. 0.0349 0.0300 0.0325
22:01-23:00, Tue., 07 Oct. 0.0363 0.0294 0.0321
21:01-22:00, Tue., 07 Oct. 0.0346 0.0295 0.0324
20:01-21:00, Tue., 07 Oct. 0.0344 0.0302 0.0326
19:01-20:00, Tue., 07 Oct. 0.0356 0.0308 0.0330
18:01-19:00, Tue., 07 Oct. 0.0348 0.0299 0.0326
17:01-18:00, Tue., 07 Oct. 0.0339 0.0295 0.0321
16:01-17:00, Tue., 07 Oct. 0.0348 0.0297 0.0323
15:01-16:00, Tue., 07 Oct. 0.0347 0.0307 0.0323
14:01-15:00, Tue., 07 Oct. 0.0355 0.0305 0.0325
13:01-14:00, Tue., 07 Oct. 0.0349 0.0305 0.0322
12:01-13:00, Tue., 07 Oct. 0.0359 0.0290 0.0326
11:01-12:00, Tue., 07 Oct. 0.0348 0.0306 0.0327
10:01-11:00, Tue., 07 Oct. 0.0346 0.0309 0.0328
09:01-10:00, Tue., 07 Oct. 0.0344 0.0301 0.0326
08:01-09:00, Tue., 07 Oct. 0.0349 0.0301 0.0325
07:01-08:00, Tue., 07 Oct. 0.0354 0.0299 0.0326
06:01-07:00, Tue., 07 Oct. 0.0356 0.0299 0.0323
05:01-06:00, Tue., 07 Oct. 0.0351 0.0304 0.0325
04:01-05:00, Tue., 07 Oct. 0.0350 0.0293 0.0327
03:01-04:00, Tue., 07 Oct. 0.0344 0.0300 0.0322
02:01-03:00, Tue., 07 Oct. 0.0347 0.0298 0.0323
01:01-02:00, Tue., 07 Oct. 0.0345 0.0302 0.0323
00:01-01:00, Tue., 07 Oct. 0.0347 0.0302 0.0325
23:01-24:00, Mon., 06 Oct. 0.0353 0.0294 0.0323
22:01-23:00, Mon., 06 Oct. 0.0348 0.0302 0.0326
21:01-22:00, Mon., 06 Oct. 0.0346 0.0298 0.0322
20:01-21:00, Mon., 06 Oct. 0.0356 0.0308 0.0326
19:01-20:00, Mon., 06 Oct. 0.0343 0.0300 0.0322
18:01-19:00, Mon., 06 Oct. 0.0347 0.0294 0.0323
17:01-18:00, Mon., 06 Oct. 0.0341 0.0299 0.0320
16:01-17:00, Mon., 06 Oct. 0.0345 0.0293 0.0323
15:01-16:00, Mon., 06 Oct. 0.0355 0.0298 0.0325
14:01-15:00, Mon., 06 Oct. 0.0354 0.0308 0.0328
13:01-14:00, Mon., 06 Oct. 0.0355 0.0308 0.0330
12:01-13:00, Mon., 06 Oct. 0.0368 0.0304 0.0334
11:01-12:00, Mon., 06 Oct. 0.0355 0.0307 0.0331
10:01-11:00, Mon., 06 Oct. 0.0349 0.0303 0.0327
09:01-10:00, Mon., 06 Oct. 0.0343 0.0308 0.0327
08:01-09:00, Mon., 06 Oct. 0.0352 0.0304 0.0329
07:01-08:00, Mon., 06 Oct. 0.0350 0.0310 0.0330
06:01-07:00, Mon., 06 Oct. 0.0363 0.0308 0.0332
05:01-06:00, Mon., 06 Oct. 0.0360 0.0305 0.0328
04:01-05:00, Mon., 06 Oct. 0.0346 0.0307 0.0326
03:01-04:00, Mon., 06 Oct. 0.0343 0.0304 0.0325
02:01-03:00, Mon., 06 Oct. 0.0347 0.0307 0.0324
01:01-02:00, Mon., 06 Oct. 0.0346 0.0292 0.0320
00:01-01:00, Mon., 06 Oct. 0.0347 0.0297 0.0323
23:01-24:00, Sun., 05 Oct. 0.0339 0.0304 0.0323
22:01-23:00, Sun., 05 Oct. 0.0346 0.0297 0.0324
21:01-22:00, Sun., 05 Oct. 0.0351 0.0290 0.0322
20:01-21:00, Sun., 05 Oct. 0.0344 0.0302 0.0322
19:01-20:00, Sun., 05 Oct. 0.0345 0.0301 0.0320
18:01-19:00, Sun., 05 Oct. 0.0353 0.0304 0.0323
17:01-18:00, Sun., 05 Oct. 0.0347 0.0297 0.0319
16:01-17:00, Sun., 05 Oct. 0.0345 0.0281 0.0321
15:01-16:00, Sun., 05 Oct. 0.0346 0.0303 0.0319
14:01-15:00, Sun., 05 Oct. 0.0339 0.0293 0.0320
13:01-14:00, Sun., 05 Oct. 0.0359 0.0296 0.0320
12:01-13:00, Sun., 05 Oct. 0.0341 0.0289 0.0321
11:01-12:00, Sun., 05 Oct. 0.0342 0.0301 0.0321
10:01-11:00, Sun., 05 Oct. 0.0346 0.0294 0.0323
09:01-10:00, Sun., 05 Oct. 0.0342 0.0301 0.0321
08:01-09:00, Sun., 05 Oct. 0.0352 0.0305 0.0322
07:01-08:00, Sun., 05 Oct. 0.0344 0.0295 0.0320
06:01-07:00, Sun., 05 Oct. 0.0342 0.0294 0.0317
05:01-06:00, Sun., 05 Oct. 0.0344 0.0301 0.0320
04:01-05:00, Sun., 05 Oct. 0.0350 0.0293 0.0319
03:01-04:00, Sun., 05 Oct. 0.0343 0.0288 0.0320
02:01-03:00, Sun., 05 Oct. 0.0337 0.0289 0.0318
01:01-02:00, Sun., 05 Oct. 0.0343 0.0299 0.0316
00:01-01:00, Sun., 05 Oct. 0.0346 0.0290 0.0319
23:01-24:00, Sat., 04 Oct. 0.0333 0.0287 0.0316
22:01-23:00, Sat., 04 Oct. 0.0344 0.0300 0.0318
21:01-22:00, Sat., 04 Oct. 0.0350 0.0297 0.0321
20:01-21:00, Sat., 04 Oct. 0.0340 0.0292 0.0317
19:01-20:00, Sat., 04 Oct. 0.0342 0.0290 0.0321
18:01-19:00, Sat., 04 Oct. 0.0343 0.0291 0.0324
17:01-18:00, Sat., 04 Oct. 0.0377 0.0315 0.0340
16:01-17:00, Sat., 04 Oct. 0.0381 0.0296 0.0345
15:01-16:00, Sat., 04 Oct. 0.0353 0.0304 0.0329
14:01-15:00, Sat., 04 Oct. 0.0383 0.0329 0.0353
13:01-14:00, Sat., 04 Oct. 0.0399 0.0332 0.0370
12:01-13:00, Sat., 04 Oct. 0.0390 0.0309 0.0340
11:01-12:00, Sat., 04 Oct. 0.0343 0.0303 0.0323
10:01-11:00, Sat., 04 Oct. 0.0353 0.0311 0.0332
09:01-10:00, Sat., 04 Oct. 0.0352 0.0311 0.0332
08:01-09:00, Sat., 04 Oct. 0.0350 0.0303 0.0331
07:01-08:00, Sat., 04 Oct. 0.0351 0.0315 0.0333
06:01-07:00, Sat., 04 Oct. 0.0363 0.0304 0.0329
05:01-06:00, Sat., 04 Oct. 0.0349 0.0308 0.0326
04:01-05:00, Sat., 04 Oct. 0.0363 0.0301 0.0327
03:01-04:00, Sat., 04 Oct. 0.0358 0.0300 0.0327
02:01-03:00, Sat., 04 Oct. 0.0346 0.0300 0.0325
01:01-02:00, Sat., 04 Oct. 0.0343 0.0299 0.0323
00:01-01:00, Sat., 04 Oct. 0.0343 0.0304 0.0325
23:01-24:00, Fri., 03 Oct. 0.0343 0.0298 0.0322
22:01-23:00, Fri., 03 Oct. 0.0345 0.0300 0.0324
21:01-22:00, Fri., 03 Oct. 0.0347 0.0299 0.0321
20:01-21:00, Fri., 03 Oct. 0.0345 0.0302 0.0322
19:01-20:00, Fri., 03 Oct. 0.0342 0.0301 0.0320
18:01-19:00, Fri., 03 Oct. 0.0345 0.0297 0.0322
17:01-18:00, Fri., 03 Oct. 0.0337 0.0297 0.0320
16:01-17:00, Fri., 03 Oct. 0.0345 0.0305 0.0323
15:01-16:00, Fri., 03 Oct. 0.0349 0.0302 0.0325
14:01-15:00, Fri., 03 Oct. 0.0343 0.0311 0.0327
13:01-14:00, Fri., 03 Oct. 0.0339 0.0302 0.0326
12:01-13:00, Fri., 03 Oct. 0.0349 0.0301 0.0327
11:01-12:00, Fri., 03 Oct. 0.0357 0.0303 0.0329
10:01-11:00, Fri., 03 Oct. 0.0350 0.0304 0.0325
09:01-10:00, Fri., 03 Oct. 0.0345 0.0308 0.0325
08:01-09:00, Fri., 03 Oct. 0.0347 0.0295 0.0327
07:01-08:00, Fri., 03 Oct. 0.0349 0.0294 0.0327
06:01-07:00, Fri., 03 Oct. 0.0356 0.0311 0.0331
05:01-06:00, Fri., 03 Oct. 0.0353 0.0303 0.0333
04:01-05:00, Fri., 03 Oct. 0.0356 0.0309 0.0327
03:01-04:00, Fri., 03 Oct. 0.0344 0.0297 0.0321
02:01-03:00, Fri., 03 Oct. 0.0355 0.0291 0.0322
01:01-02:00, Fri., 03 Oct. 0.0343 0.0293 0.0321
00:01-01:00, Fri., 03 Oct. 0.0348 0.0301 0.0323
23:01-24:00, Thu., 02 Oct. 0.0342 0.0295 0.0316
22:01-23:00, Thu., 02 Oct. 0.0350 0.0297 0.0323
21:01-22:00, Thu., 02 Oct. 0.0344 0.0300 0.0321
20:01-21:00, Thu., 02 Oct. 0.0344 0.0301 0.0324
19:01-20:00, Thu., 02 Oct. 0.0350 0.0298 0.0322
18:01-19:00, Thu., 02 Oct. 0.0341 0.0295 0.0320
17:01-18:00, Thu., 02 Oct. 0.0341 0.0303 0.0322
16:01-17:00, Thu., 02 Oct. 0.0348 0.0301 0.0324
15:01-16:00, Thu., 02 Oct. 0.0343 0.0295 0.0323
14:01-15:00, Thu., 02 Oct. 0.0343 0.0301 0.0322
13:01-14:00, Thu., 02 Oct. 0.0347 0.0308 0.0327
12:01-13:00, Thu., 02 Oct. 0.0346 0.0305 0.0328
11:01-12:00, Thu., 02 Oct. 0.0357 0.0310 0.0329
10:01-11:00, Thu., 02 Oct. 0.0350 0.0307 0.0330
09:01-10:00, Thu., 02 Oct. 0.0348 0.0308 0.0324
08:01-09:00, Thu., 02 Oct. 0.0348 0.0304 0.0325
07:01-08:00, Thu., 02 Oct. 0.0344 0.0304 0.0325
06:01-07:00, Thu., 02 Oct. 0.0344 0.0303 0.0324
05:01-06:00, Thu., 02 Oct. 0.0355 0.0301 0.0320
04:01-05:00, Thu., 02 Oct. 0.0349 0.0301 0.0324
03:01-04:00, Thu., 02 Oct. 0.0348 0.0298 0.0318
02:01-03:00, Thu., 02 Oct. 0.0352 0.0300 0.0319
01:01-02:00, Thu., 02 Oct. 0.0346 0.0300 0.0319
00:01-01:00, Thu., 02 Oct. 0.0346 0.0296 0.0320
23:01-24:00, Wed., 01 Oct. 0.0349 0.0297 0.0316
22:01-23:00, Wed., 01 Oct. 0.0340 0.0297 0.0317