Radiation doses in the air / Measurement results by the hour (Kodaira)

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
06:01-07:00, Sun., 14 Sep. 0.0391 0.0339 0.0360
05:01-06:00, Sun., 14 Sep. 0.0382 0.0318 0.0350
04:01-05:00, Sun., 14 Sep. 0.0363 0.0317 0.0339
03:01-04:00, Sun., 14 Sep. 0.0365 0.0304 0.0337
02:01-03:00, Sun., 14 Sep. 0.0358 0.0313 0.0338
01:01-02:00, Sun., 14 Sep. 0.0367 0.0306 0.0337
00:01-01:00, Sun., 14 Sep. 0.0354 0.0308 0.0332
23:01-24:00, Sat., 13 Sep. 0.0360 0.0311 0.0335
22:01-23:00, Sat., 13 Sep. 0.0361 0.0311 0.0338
21:01-22:00, Sat., 13 Sep. 0.0357 0.0308 0.0334
20:01-21:00, Sat., 13 Sep. 0.0353 0.0304 0.0328
19:01-20:00, Sat., 13 Sep. 0.0352 0.0300 0.0328
18:01-19:00, Sat., 13 Sep. 0.0344 0.0301 0.0328
17:01-18:00, Sat., 13 Sep. 0.0367 0.0312 0.0335
16:01-17:00, Sat., 13 Sep. 0.0356 0.0307 0.0336
15:01-16:00, Sat., 13 Sep. 0.0365 0.0304 0.0338
14:01-15:00, Sat., 13 Sep. 0.0371 0.0318 0.0344
13:01-14:00, Sat., 13 Sep. 0.0357 0.0307 0.0334
12:01-13:00, Sat., 13 Sep. 0.0360 0.0315 0.0336
11:01-12:00, Sat., 13 Sep. 0.0365 0.0316 0.0337
10:01-11:00, Sat., 13 Sep. 0.0364 0.0315 0.0342
09:01-10:00, Sat., 13 Sep. 0.0400 0.0327 0.0360
08:01-09:00, Sat., 13 Sep. 0.0411 0.0358 0.0381
07:01-08:00, Sat., 13 Sep. 0.0384 0.0329 0.0356
06:01-07:00, Sat., 13 Sep. 0.0385 0.0316 0.0350
05:01-06:00, Sat., 13 Sep. 0.0368 0.0307 0.0332
04:01-05:00, Sat., 13 Sep. 0.0355 0.0311 0.0337
03:01-04:00, Sat., 13 Sep. 0.0359 0.0315 0.0336
02:01-03:00, Sat., 13 Sep. 0.0384 0.0333 0.0354
01:01-02:00, Sat., 13 Sep. 0.0391 0.0346 0.0368
00:01-01:00, Sat., 13 Sep. 0.0380 0.0342 0.0362
23:01-24:00, Fri., 12 Sep. 0.0373 0.0325 0.0349
22:01-23:00, Fri., 12 Sep. 0.0408 0.0336 0.0371
21:01-22:00, Fri., 12 Sep. 0.0423 0.0373 0.0392
20:01-21:00, Fri., 12 Sep. 0.0412 0.0337 0.0372
19:01-20:00, Fri., 12 Sep. 0.0370 0.0323 0.0350
18:01-19:00, Fri., 12 Sep. 0.0370 0.0314 0.0340
17:01-18:00, Fri., 12 Sep. 0.0370 0.0314 0.0336
16:01-17:00, Fri., 12 Sep. 0.0353 0.0310 0.0332
15:01-16:00, Fri., 12 Sep. 0.0360 0.0318 0.0338
14:01-15:00, Fri., 12 Sep. 0.0366 0.0317 0.0343
13:01-14:00, Fri., 12 Sep. 0.0370 0.0321 0.0347
12:01-13:00, Fri., 12 Sep. 0.0377 0.0331 0.0356
11:01-12:00, Fri., 12 Sep. 0.0371 0.0327 0.0347
10:01-11:00, Fri., 12 Sep. 0.0368 0.0321 0.0344
09:01-10:00, Fri., 12 Sep. 0.0361 0.0311 0.0333
08:01-09:00, Fri., 12 Sep. 0.0360 0.0306 0.0336
07:01-08:00, Fri., 12 Sep. 0.0358 0.0311 0.0333
06:01-07:00, Fri., 12 Sep. 0.0352 0.0308 0.0333
05:01-06:00, Fri., 12 Sep. 0.0361 0.0311 0.0334
04:01-05:00, Fri., 12 Sep. 0.0361 0.0313 0.0341
03:01-04:00, Fri., 12 Sep. 0.0394 0.0333 0.0363
02:01-03:00, Fri., 12 Sep. 0.0408 0.0339 0.0381
01:01-02:00, Fri., 12 Sep. 0.0402 0.0341 0.0369
00:01-01:00, Fri., 12 Sep. 0.0419 0.0353 0.0385
23:01-24:00, Thu., 11 Sep. 0.0471 0.0405 0.0434
22:01-23:00, Thu., 11 Sep. 0.0427 0.0318 0.0363
21:01-22:00, Thu., 11 Sep. 0.0374 0.0315 0.0341
20:01-21:00, Thu., 11 Sep. 0.0372 0.0318 0.0342
19:01-20:00, Thu., 11 Sep. 0.0372 0.0321 0.0346
18:01-19:00, Thu., 11 Sep. 0.0379 0.0320 0.0344
17:01-18:00, Thu., 11 Sep. 0.0402 0.0324 0.0358
16:01-17:00, Thu., 11 Sep. 0.0507 0.0366 0.0433
15:01-16:00, Thu., 11 Sep. 0.0701 0.0485 0.0601
14:01-15:00, Thu., 11 Sep. 0.0687 0.0309 0.0467
13:01-14:00, Thu., 11 Sep. 0.0364 0.0312 0.0336
12:01-13:00, Thu., 11 Sep. 0.0363 0.0317 0.0338
11:01-12:00, Thu., 11 Sep. 0.0359 0.0308 0.0337
10:01-11:00, Thu., 11 Sep. 0.0371 0.0315 0.0338
09:01-10:00, Thu., 11 Sep. 0.0378 0.0321 0.0344
08:01-09:00, Thu., 11 Sep. 0.0368 0.0329 0.0350
07:01-08:00, Thu., 11 Sep. 0.0380 0.0341 0.0361
06:01-07:00, Thu., 11 Sep. 0.0385 0.0336 0.0358
05:01-06:00, Thu., 11 Sep. 0.0385 0.0343 0.0364
04:01-05:00, Thu., 11 Sep. 0.0371 0.0319 0.0347
03:01-04:00, Thu., 11 Sep. 0.0371 0.0327 0.0350
02:01-03:00, Thu., 11 Sep. 0.0366 0.0314 0.0339
01:01-02:00, Thu., 11 Sep. 0.0361 0.0308 0.0334
00:01-01:00, Thu., 11 Sep. 0.0358 0.0317 0.0334
23:01-24:00, Wed., 10 Sep. 0.0356 0.0316 0.0337
22:01-23:00, Wed., 10 Sep. 0.0367 0.0309 0.0336
21:01-22:00, Wed., 10 Sep. 0.0361 0.0311 0.0337
20:01-21:00, Wed., 10 Sep. 0.0361 0.0313 0.0333
19:01-20:00, Wed., 10 Sep. 0.0351 0.0315 0.0333
18:01-19:00, Wed., 10 Sep. 0.0358 0.0316 0.0336
17:01-18:00, Wed., 10 Sep. 0.0369 0.0308 0.0336
16:01-17:00, Wed., 10 Sep. 0.0365 0.0307 0.0335
15:01-16:00, Wed., 10 Sep. 0.0361 0.0311 0.0340
14:01-15:00, Wed., 10 Sep. 0.0358 0.0315 0.0339
13:01-14:00, Wed., 10 Sep. 0.0381 0.0322 0.0352
12:01-13:00, Wed., 10 Sep. 0.0384 0.0323 0.0355
11:01-12:00, Wed., 10 Sep. 0.0363 0.0319 0.0341
10:01-11:00, Wed., 10 Sep. 0.0370 0.0305 0.0342
09:01-10:00, Wed., 10 Sep. 0.0367 0.0319 0.0343
08:01-09:00, Wed., 10 Sep. 0.0369 0.0319 0.0346
07:01-08:00, Wed., 10 Sep. 0.0379 0.0320 0.0345
06:01-07:00, Wed., 10 Sep. 0.0376 0.0332 0.0348
05:01-06:00, Wed., 10 Sep. 0.0374 0.0321 0.0345
04:01-05:00, Wed., 10 Sep. 0.0373 0.0320 0.0344
03:01-04:00, Wed., 10 Sep. 0.0364 0.0327 0.0346
02:01-03:00, Wed., 10 Sep. 0.0367 0.0322 0.0346
01:01-02:00, Wed., 10 Sep. 0.0378 0.0327 0.0353
00:01-01:00, Wed., 10 Sep. 0.0367 0.0324 0.0345
23:01-24:00, Tue., 09 Sep. 0.0365 0.0323 0.0345
22:01-23:00, Tue., 09 Sep. 0.0365 0.0320 0.0345
21:01-22:00, Tue., 09 Sep. 0.0372 0.0323 0.0345
20:01-21:00, Tue., 09 Sep. 0.0362 0.0325 0.0344
19:01-20:00, Tue., 09 Sep. 0.0370 0.0324 0.0346
18:01-19:00, Tue., 09 Sep. 0.0367 0.0313 0.0343
17:01-18:00, Tue., 09 Sep. 0.0373 0.0311 0.0344
16:01-17:00, Tue., 09 Sep. 0.0363 0.0320 0.0340
15:01-16:00, Tue., 09 Sep. 0.0379 0.0319 0.0340
14:01-15:00, Tue., 09 Sep. 0.0367 0.0323 0.0341
13:01-14:00, Tue., 09 Sep. 0.0370 0.0316 0.0339
12:01-13:00, Tue., 09 Sep. 0.0359 0.0314 0.0337
11:01-12:00, Tue., 09 Sep. 0.0368 0.0312 0.0338
10:01-11:00, Tue., 09 Sep. 0.0358 0.0318 0.0339
09:01-10:00, Tue., 09 Sep. 0.0368 0.0313 0.0343
08:01-09:00, Tue., 09 Sep. 0.0364 0.0322 0.0345
07:01-08:00, Tue., 09 Sep. 0.0373 0.0323 0.0345
06:01-07:00, Tue., 09 Sep. 0.0372 0.0324 0.0347
05:01-06:00, Tue., 09 Sep. 0.0370 0.0317 0.0345
04:01-05:00, Tue., 09 Sep. 0.0367 0.0315 0.0343
03:01-04:00, Tue., 09 Sep. 0.0367 0.0318 0.0340
02:01-03:00, Tue., 09 Sep. 0.0377 0.0324 0.0345
01:01-02:00, Tue., 09 Sep. 0.0366 0.0318 0.0341
00:01-01:00, Tue., 09 Sep. 0.0363 0.0319 0.0339
23:01-24:00, Mon., 08 Sep. 0.0360 0.0315 0.0339
22:01-23:00, Mon., 08 Sep. 0.0374 0.0317 0.0339
21:01-22:00, Mon., 08 Sep. 0.0375 0.0315 0.0341
20:01-21:00, Mon., 08 Sep. 0.0367 0.0319 0.0344
19:01-20:00, Mon., 08 Sep. 0.0405 0.0332 0.0366
18:01-19:00, Mon., 08 Sep. 0.0525 0.0374 0.0438
17:01-18:00, Mon., 08 Sep. 0.0577 0.0392 0.0503
16:01-17:00, Mon., 08 Sep. 0.0394 0.0322 0.0353
15:01-16:00, Mon., 08 Sep. 0.0372 0.0320 0.0339
14:01-15:00, Mon., 08 Sep. 0.0359 0.0308 0.0339
13:01-14:00, Mon., 08 Sep. 0.0371 0.0316 0.0347
12:01-13:00, Mon., 08 Sep. 0.0382 0.0322 0.0346
11:01-12:00, Mon., 08 Sep. 0.0369 0.0322 0.0346
10:01-11:00, Mon., 08 Sep. 0.0379 0.0329 0.0351
09:01-10:00, Mon., 08 Sep. 0.0382 0.0329 0.0355
08:01-09:00, Mon., 08 Sep. 0.0390 0.0341 0.0362
07:01-08:00, Mon., 08 Sep. 0.0399 0.0337 0.0367
06:01-07:00, Mon., 08 Sep. 0.0406 0.0346 0.0369
05:01-06:00, Mon., 08 Sep. 0.0400 0.0338 0.0372
04:01-05:00, Mon., 08 Sep. 0.0397 0.0339 0.0372
03:01-04:00, Mon., 08 Sep. 0.0393 0.0335 0.0366
02:01-03:00, Mon., 08 Sep. 0.0398 0.0343 0.0366
01:01-02:00, Mon., 08 Sep. 0.0392 0.0332 0.0364
00:01-01:00, Mon., 08 Sep. 0.0366 0.0322 0.0341
23:01-24:00, Sun., 07 Sep. 0.0357 0.0319 0.0339
22:01-23:00, Sun., 07 Sep. 0.0357 0.0310 0.0336
21:01-22:00, Sun., 07 Sep. 0.0370 0.0313 0.0340
20:01-21:00, Sun., 07 Sep. 0.0359 0.0305 0.0337
19:01-20:00, Sun., 07 Sep. 0.0359 0.0310 0.0337
18:01-19:00, Sun., 07 Sep. 0.0366 0.0316 0.0340
17:01-18:00, Sun., 07 Sep. 0.0358 0.0317 0.0338
16:01-17:00, Sun., 07 Sep. 0.0361 0.0322 0.0342
15:01-16:00, Sun., 07 Sep. 0.0353 0.0312 0.0334
14:01-15:00, Sun., 07 Sep. 0.0358 0.0315 0.0336
13:01-14:00, Sun., 07 Sep. 0.0358 0.0303 0.0333
12:01-13:00, Sun., 07 Sep. 0.0362 0.0310 0.0337
11:01-12:00, Sun., 07 Sep. 0.0363 0.0307 0.0335
10:01-11:00, Sun., 07 Sep. 0.0360 0.0311 0.0338
09:01-10:00, Sun., 07 Sep. 0.0375 0.0313 0.0347
08:01-09:00, Sun., 07 Sep. 0.0388 0.0320 0.0344
07:01-08:00, Sun., 07 Sep. 0.0364 0.0311 0.0343
06:01-07:00, Sun., 07 Sep. 0.0369 0.0317 0.0341
05:01-06:00, Sun., 07 Sep. 0.0358 0.0315 0.0338
04:01-05:00, Sun., 07 Sep. 0.0367 0.0306 0.0339
03:01-04:00, Sun., 07 Sep. 0.0367 0.0323 0.0344
02:01-03:00, Sun., 07 Sep. 0.0372 0.0321 0.0345
01:01-02:00, Sun., 07 Sep. 0.0356 0.0311 0.0335
00:01-01:00, Sun., 07 Sep. 0.0353 0.0310 0.0335
23:01-24:00, Sat., 06 Sep. 0.0363 0.0315 0.0335
22:01-23:00, Sat., 06 Sep. 0.0358 0.0315 0.0335
21:01-22:00, Sat., 06 Sep. 0.0361 0.0316 0.0335
20:01-21:00, Sat., 06 Sep. 0.0356 0.0302 0.0333
19:01-20:00, Sat., 06 Sep. 0.0371 0.0315 0.0336
18:01-19:00, Sat., 06 Sep. 0.0359 0.0320 0.0339
17:01-18:00, Sat., 06 Sep. 0.0361 0.0319 0.0339
16:01-17:00, Sat., 06 Sep. 0.0361 0.0318 0.0338
15:01-16:00, Sat., 06 Sep. 0.0367 0.0315 0.0338
14:01-15:00, Sat., 06 Sep. 0.0361 0.0308 0.0337
13:01-14:00, Sat., 06 Sep. 0.0363 0.0307 0.0339
12:01-13:00, Sat., 06 Sep. 0.0365 0.0317 0.0337
11:01-12:00, Sat., 06 Sep. 0.0360 0.0303 0.0336
10:01-11:00, Sat., 06 Sep. 0.0360 0.0320 0.0338
09:01-10:00, Sat., 06 Sep. 0.0365 0.0307 0.0342
08:01-09:00, Sat., 06 Sep. 0.0366 0.0325 0.0342
07:01-08:00, Sat., 06 Sep. 0.0370 0.0308 0.0339
06:01-07:00, Sat., 06 Sep. 0.0364 0.0320 0.0344
05:01-06:00, Sat., 06 Sep. 0.0365 0.0318 0.0342
04:01-05:00, Sat., 06 Sep. 0.0363 0.0318 0.0342
03:01-04:00, Sat., 06 Sep. 0.0362 0.0324 0.0343
02:01-03:00, Sat., 06 Sep. 0.0372 0.0325 0.0347
01:01-02:00, Sat., 06 Sep. 0.0368 0.0318 0.0344
00:01-01:00, Sat., 06 Sep. 0.0368 0.0325 0.0344
23:01-24:00, Fri., 05 Sep. 0.0362 0.0315 0.0337
22:01-23:00, Fri., 05 Sep. 0.0367 0.0315 0.0339
21:01-22:00, Fri., 05 Sep. 0.0363 0.0312 0.0337
20:01-21:00, Fri., 05 Sep. 0.0355 0.0307 0.0329
19:01-20:00, Fri., 05 Sep. 0.0348 0.0311 0.0329
18:01-19:00, Fri., 05 Sep. 0.0356 0.0311 0.0332
17:01-18:00, Fri., 05 Sep. 0.0360 0.0307 0.0335
16:01-17:00, Fri., 05 Sep. 0.0381 0.0327 0.0355
15:01-16:00, Fri., 05 Sep. 0.0422 0.0354 0.0391
14:01-15:00, Fri., 05 Sep. 0.0453 0.0397 0.0422
13:01-14:00, Fri., 05 Sep. 0.0436 0.0388 0.0414
12:01-13:00, Fri., 05 Sep. 0.0417 0.0358 0.0386
11:01-12:00, Fri., 05 Sep. 0.0396 0.0325 0.0360
10:01-11:00, Fri., 05 Sep. 0.0393 0.0313 0.0350
09:01-10:00, Fri., 05 Sep. 0.0369 0.0318 0.0346
08:01-09:00, Fri., 05 Sep. 0.0373 0.0324 0.0349
07:01-08:00, Fri., 05 Sep. 0.0378 0.0325 0.0352
06:01-07:00, Fri., 05 Sep. 0.0395 0.0339 0.0361
05:01-06:00, Fri., 05 Sep. 0.0377 0.0322 0.0343
04:01-05:00, Fri., 05 Sep. 0.0365 0.0306 0.0341
03:01-04:00, Fri., 05 Sep. 0.0360 0.0324 0.0341
02:01-03:00, Fri., 05 Sep. 0.0370 0.0318 0.0345
01:01-02:00, Fri., 05 Sep. 0.0362 0.0324 0.0344
00:01-01:00, Fri., 05 Sep. 0.0361 0.0315 0.0340
23:01-24:00, Thu., 04 Sep. 0.0364 0.0318 0.0342
22:01-23:00, Thu., 04 Sep. 0.0364 0.0310 0.0337
21:01-22:00, Thu., 04 Sep. 0.0360 0.0315 0.0336
20:01-21:00, Thu., 04 Sep. 0.0367 0.0318 0.0338
19:01-20:00, Thu., 04 Sep. 0.0369 0.0325 0.0344
18:01-19:00, Thu., 04 Sep. 0.0373 0.0313 0.0341
17:01-18:00, Thu., 04 Sep. 0.0377 0.0318 0.0350
16:01-17:00, Thu., 04 Sep. 0.0392 0.0332 0.0368
15:01-16:00, Thu., 04 Sep. 0.0404 0.0331 0.0364
14:01-15:00, Thu., 04 Sep. 0.0363 0.0323 0.0344
13:01-14:00, Thu., 04 Sep. 0.0377 0.0318 0.0350
12:01-13:00, Thu., 04 Sep. 0.0425 0.0353 0.0379
11:01-12:00, Thu., 04 Sep. 0.0506 0.0395 0.0449
10:01-11:00, Thu., 04 Sep. 0.0526 0.0382 0.0469
09:01-10:00, Thu., 04 Sep. 0.0390 0.0327 0.0351
08:01-09:00, Thu., 04 Sep. 0.0378 0.0329 0.0351
07:01-08:00, Thu., 04 Sep. 0.0379 0.0329 0.0352