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
21:01-22:00, Sat., 11 Oct. 0.0371 0.0322 0.0342
20:01-21:00, Sat., 11 Oct. 0.0389 0.0325 0.0352
19:01-20:00, Sat., 11 Oct. 0.0390 0.0343 0.0362
18:01-19:00, Sat., 11 Oct. 0.0423 0.0361 0.0387
17:01-18:00, Sat., 11 Oct. 0.0438 0.0385 0.0410
16:01-17:00, Sat., 11 Oct. 0.0445 0.0395 0.0421
15:01-16:00, Sat., 11 Oct. 0.0479 0.0380 0.0419
14:01-15:00, Sat., 11 Oct. 0.0549 0.0443 0.0497
13:01-14:00, Sat., 11 Oct. 0.0562 0.0454 0.0499
12:01-13:00, Sat., 11 Oct. 0.0507 0.0433 0.0467
11:01-12:00, Sat., 11 Oct. 0.0545 0.0457 0.0502
10:01-11:00, Sat., 11 Oct. 0.0529 0.0451 0.0492
09:01-10:00, Sat., 11 Oct. 0.0521 0.0424 0.0482
08:01-09:00, Sat., 11 Oct. 0.0418 0.0353 0.0391
07:01-08:00, Sat., 11 Oct. 0.0390 0.0328 0.0356
06:01-07:00, Sat., 11 Oct. 0.0384 0.0327 0.0348
05:01-06:00, Sat., 11 Oct. 0.0374 0.0325 0.0350
04:01-05:00, Sat., 11 Oct. 0.0383 0.0327 0.0355
03:01-04:00, Sat., 11 Oct. 0.0392 0.0343 0.0369
02:01-03:00, Sat., 11 Oct. 0.0381 0.0328 0.0356
01:01-02:00, Sat., 11 Oct. 0.0371 0.0321 0.0350
00:01-01:00, Sat., 11 Oct. 0.0390 0.0319 0.0347
23:01-24:00, Fri., 10 Oct. 0.0370 0.0322 0.0346
22:01-23:00, Fri., 10 Oct. 0.0365 0.0316 0.0341
21:01-22:00, Fri., 10 Oct. 0.0367 0.0321 0.0342
20:01-21:00, Fri., 10 Oct. 0.0364 0.0312 0.0341
19:01-20:00, Fri., 10 Oct. 0.0363 0.0313 0.0339
18:01-19:00, Fri., 10 Oct. 0.0370 0.0317 0.0341
17:01-18:00, Fri., 10 Oct. 0.0363 0.0318 0.0341
16:01-17:00, Fri., 10 Oct. 0.0360 0.0322 0.0342
15:01-16:00, Fri., 10 Oct. 0.0365 0.0326 0.0344
14:01-15:00, Fri., 10 Oct. 0.0372 0.0315 0.0347
13:01-14:00, Fri., 10 Oct. 0.0379 0.0321 0.0348
12:01-13:00, Fri., 10 Oct. 0.0373 0.0324 0.0346
11:01-12:00, Fri., 10 Oct. 0.0379 0.0334 0.0348
10:01-11:00, Fri., 10 Oct. 0.0370 0.0329 0.0346
09:01-10:00, Fri., 10 Oct. 0.0366 0.0322 0.0343
08:01-09:00, Fri., 10 Oct. 0.0367 0.0329 0.0350
07:01-08:00, Fri., 10 Oct. 0.0367 0.0327 0.0348
06:01-07:00, Fri., 10 Oct. 0.0370 0.0322 0.0349
05:01-06:00, Fri., 10 Oct. 0.0388 0.0322 0.0346
04:01-05:00, Fri., 10 Oct. 0.0371 0.0325 0.0347
03:01-04:00, Fri., 10 Oct. 0.0367 0.0325 0.0346
02:01-03:00, Fri., 10 Oct. 0.0359 0.0327 0.0342
01:01-02:00, Fri., 10 Oct. 0.0361 0.0314 0.0340
00:01-01:00, Fri., 10 Oct. 0.0368 0.0324 0.0343
23:01-24:00, Thu., 09 Oct. 0.0364 0.0320 0.0342
22:01-23:00, Thu., 09 Oct. 0.0362 0.0318 0.0341
21:01-22:00, Thu., 09 Oct. 0.0365 0.0312 0.0341
20:01-21:00, Thu., 09 Oct. 0.0362 0.0320 0.0342
19:01-20:00, Thu., 09 Oct. 0.0366 0.0318 0.0342
18:01-19:00, Thu., 09 Oct. 0.0373 0.0319 0.0345
17:01-18:00, Thu., 09 Oct. 0.0364 0.0323 0.0343
16:01-17:00, Thu., 09 Oct. 0.0369 0.0318 0.0343
15:01-16:00, Thu., 09 Oct. 0.0363 0.0326 0.0343
14:01-15:00, Thu., 09 Oct. 0.0366 0.0321 0.0342
13:01-14:00, Thu., 09 Oct. 0.0367 0.0311 0.0340
12:01-13:00, Thu., 09 Oct. 0.0363 0.0321 0.0342
11:01-12:00, Thu., 09 Oct. 0.0367 0.0321 0.0344
10:01-11:00, Thu., 09 Oct. 0.0381 0.0318 0.0344
09:01-10:00, Thu., 09 Oct. 0.0368 0.0327 0.0348
08:01-09:00, Thu., 09 Oct. 0.0371 0.0329 0.0347
07:01-08:00, Thu., 09 Oct. 0.0373 0.0324 0.0348
06:01-07:00, Thu., 09 Oct. 0.0379 0.0328 0.0351
05:01-06:00, Thu., 09 Oct. 0.0370 0.0322 0.0345
04:01-05:00, Thu., 09 Oct. 0.0369 0.0325 0.0348
03:01-04:00, Thu., 09 Oct. 0.0370 0.0316 0.0347
02:01-03:00, Thu., 09 Oct. 0.0370 0.0311 0.0346
01:01-02:00, Thu., 09 Oct. 0.0382 0.0325 0.0350
00:01-01:00, Thu., 09 Oct. 0.0381 0.0329 0.0351
23:01-24:00, Wed., 08 Oct. 0.0370 0.0323 0.0347
22:01-23:00, Wed., 08 Oct. 0.0363 0.0322 0.0345
21:01-22:00, Wed., 08 Oct. 0.0372 0.0316 0.0346
20:01-21:00, Wed., 08 Oct. 0.0367 0.0320 0.0346
19:01-20:00, Wed., 08 Oct. 0.0362 0.0323 0.0343
18:01-19:00, Wed., 08 Oct. 0.0365 0.0309 0.0338
17:01-18:00, Wed., 08 Oct. 0.0367 0.0320 0.0344
16:01-17:00, Wed., 08 Oct. 0.0360 0.0325 0.0342
15:01-16:00, Wed., 08 Oct. 0.0362 0.0318 0.0342
14:01-15:00, Wed., 08 Oct. 0.0374 0.0310 0.0341
13:01-14:00, Wed., 08 Oct. 0.0367 0.0311 0.0343
12:01-13:00, Wed., 08 Oct. 0.0372 0.0318 0.0340
11:01-12:00, Wed., 08 Oct. 0.0373 0.0317 0.0342
10:01-11:00, Wed., 08 Oct. 0.0366 0.0319 0.0341
09:01-10:00, Wed., 08 Oct. 0.0370 0.0313 0.0341
08:01-09:00, Wed., 08 Oct. 0.0380 0.0317 0.0340
07:01-08:00, Wed., 08 Oct. 0.0362 0.0318 0.0341
06:01-07:00, Wed., 08 Oct. 0.0365 0.0313 0.0341
05:01-06:00, Wed., 08 Oct. 0.0349 0.0317 0.0336
04:01-05:00, Wed., 08 Oct. 0.0369 0.0321 0.0339
03:01-04:00, Wed., 08 Oct. 0.0367 0.0320 0.0339
02:01-03:00, Wed., 08 Oct. 0.0356 0.0317 0.0336
01:01-02:00, Wed., 08 Oct. 0.0370 0.0321 0.0343
00:01-01:00, Wed., 08 Oct. 0.0367 0.0317 0.0341
23:01-24:00, Tue., 07 Oct. 0.0367 0.0311 0.0341
22:01-23:00, Tue., 07 Oct. 0.0360 0.0318 0.0340
21:01-22:00, Tue., 07 Oct. 0.0362 0.0317 0.0341
20:01-21:00, Tue., 07 Oct. 0.0361 0.0310 0.0339
19:01-20:00, Tue., 07 Oct. 0.0366 0.0325 0.0342
18:01-19:00, Tue., 07 Oct. 0.0364 0.0315 0.0339
17:01-18:00, Tue., 07 Oct. 0.0367 0.0311 0.0337
16:01-17:00, Tue., 07 Oct. 0.0363 0.0316 0.0339
15:01-16:00, Tue., 07 Oct. 0.0356 0.0317 0.0337
14:01-15:00, Tue., 07 Oct. 0.0361 0.0319 0.0343
13:01-14:00, Tue., 07 Oct. 0.0362 0.0318 0.0340
12:01-13:00, Tue., 07 Oct. 0.0371 0.0320 0.0340
11:01-12:00, Tue., 07 Oct. 0.0360 0.0313 0.0340
10:01-11:00, Tue., 07 Oct. 0.0365 0.0323 0.0340
09:01-10:00, Tue., 07 Oct. 0.0371 0.0322 0.0344
08:01-09:00, Tue., 07 Oct. 0.0368 0.0313 0.0341
07:01-08:00, Tue., 07 Oct. 0.0353 0.0317 0.0339
06:01-07:00, Tue., 07 Oct. 0.0363 0.0314 0.0336
05:01-06:00, Tue., 07 Oct. 0.0362 0.0325 0.0342
04:01-05:00, Tue., 07 Oct. 0.0361 0.0317 0.0339
03:01-04:00, Tue., 07 Oct. 0.0360 0.0307 0.0340
02:01-03:00, Tue., 07 Oct. 0.0373 0.0310 0.0338
01:01-02:00, Tue., 07 Oct. 0.0377 0.0316 0.0340
00:01-01:00, Tue., 07 Oct. 0.0360 0.0310 0.0338
23:01-24:00, Mon., 06 Oct. 0.0362 0.0316 0.0339
22:01-23:00, Mon., 06 Oct. 0.0366 0.0321 0.0340
21:01-22:00, Mon., 06 Oct. 0.0359 0.0319 0.0337
20:01-21:00, Mon., 06 Oct. 0.0365 0.0318 0.0339
19:01-20:00, Mon., 06 Oct. 0.0362 0.0315 0.0340
18:01-19:00, Mon., 06 Oct. 0.0360 0.0323 0.0340
17:01-18:00, Mon., 06 Oct. 0.0363 0.0319 0.0340
16:01-17:00, Mon., 06 Oct. 0.0371 0.0324 0.0344
15:01-16:00, Mon., 06 Oct. 0.0370 0.0319 0.0345
14:01-15:00, Mon., 06 Oct. 0.0371 0.0322 0.0343
13:01-14:00, Mon., 06 Oct. 0.0363 0.0317 0.0342
12:01-13:00, Mon., 06 Oct. 0.0370 0.0322 0.0343
11:01-12:00, Mon., 06 Oct. 0.0367 0.0323 0.0346
10:01-11:00, Mon., 06 Oct. 0.0378 0.0326 0.0356
09:01-10:00, Mon., 06 Oct. 0.0370 0.0329 0.0352
08:01-09:00, Mon., 06 Oct. 0.0373 0.0325 0.0352
07:01-08:00, Mon., 06 Oct. 0.0380 0.0332 0.0356
06:01-07:00, Mon., 06 Oct. 0.0373 0.0334 0.0355
05:01-06:00, Mon., 06 Oct. 0.0379 0.0325 0.0347
04:01-05:00, Mon., 06 Oct. 0.0366 0.0310 0.0340
03:01-04:00, Mon., 06 Oct. 0.0364 0.0318 0.0342
02:01-03:00, Mon., 06 Oct. 0.0366 0.0322 0.0342
01:01-02:00, Mon., 06 Oct. 0.0369 0.0318 0.0344
00:01-01:00, Mon., 06 Oct. 0.0367 0.0321 0.0345
23:01-24:00, Sun., 05 Oct. 0.0369 0.0318 0.0341
22:01-23:00, Sun., 05 Oct. 0.0353 0.0312 0.0332
21:01-22:00, Sun., 05 Oct. 0.0359 0.0318 0.0336
20:01-21:00, Sun., 05 Oct. 0.0354 0.0305 0.0334
19:01-20:00, Sun., 05 Oct. 0.0363 0.0318 0.0335
18:01-19:00, Sun., 05 Oct. 0.0366 0.0315 0.0337
17:01-18:00, Sun., 05 Oct. 0.0360 0.0321 0.0338
16:01-17:00, Sun., 05 Oct. 0.0362 0.0315 0.0339
15:01-16:00, Sun., 05 Oct. 0.0356 0.0312 0.0337
14:01-15:00, Sun., 05 Oct. 0.0360 0.0308 0.0338
13:01-14:00, Sun., 05 Oct. 0.0368 0.0316 0.0341
12:01-13:00, Sun., 05 Oct. 0.0360 0.0315 0.0339
11:01-12:00, Sun., 05 Oct. 0.0367 0.0313 0.0341
10:01-11:00, Sun., 05 Oct. 0.0366 0.0322 0.0340
09:01-10:00, Sun., 05 Oct. 0.0364 0.0310 0.0340
08:01-09:00, Sun., 05 Oct. 0.0363 0.0310 0.0340
07:01-08:00, Sun., 05 Oct. 0.0366 0.0312 0.0340
06:01-07:00, Sun., 05 Oct. 0.0367 0.0315 0.0341
05:01-06:00, Sun., 05 Oct. 0.0361 0.0313 0.0339
04:01-05:00, Sun., 05 Oct. 0.0364 0.0325 0.0341
03:01-04:00, Sun., 05 Oct. 0.0363 0.0321 0.0341
02:01-03:00, Sun., 05 Oct. 0.0366 0.0317 0.0340
01:01-02:00, Sun., 05 Oct. 0.0364 0.0310 0.0341
00:01-01:00, Sun., 05 Oct. 0.0366 0.0314 0.0342
23:01-24:00, Sat., 04 Oct. 0.0368 0.0315 0.0340
22:01-23:00, Sat., 04 Oct. 0.0377 0.0315 0.0341
21:01-22:00, Sat., 04 Oct. 0.0369 0.0317 0.0342
20:01-21:00, Sat., 04 Oct. 0.0375 0.0326 0.0346
19:01-20:00, Sat., 04 Oct. 0.0381 0.0332 0.0355
18:01-19:00, Sat., 04 Oct. 0.0395 0.0346 0.0370
17:01-18:00, Sat., 04 Oct. 0.0384 0.0342 0.0363
16:01-17:00, Sat., 04 Oct. 0.0391 0.0338 0.0360
15:01-16:00, Sat., 04 Oct. 0.0391 0.0336 0.0367
14:01-15:00, Sat., 04 Oct. 0.0373 0.0318 0.0344
13:01-14:00, Sat., 04 Oct. 0.0374 0.0330 0.0349
12:01-13:00, Sat., 04 Oct. 0.0373 0.0324 0.0347
11:01-12:00, Sat., 04 Oct. 0.0384 0.0327 0.0353
10:01-11:00, Sat., 04 Oct. 0.0388 0.0334 0.0362
09:01-10:00, Sat., 04 Oct. 0.0370 0.0324 0.0346
08:01-09:00, Sat., 04 Oct. 0.0367 0.0322 0.0347
07:01-08:00, Sat., 04 Oct. 0.0366 0.0321 0.0347
06:01-07:00, Sat., 04 Oct. 0.0376 0.0325 0.0351
05:01-06:00, Sat., 04 Oct. 0.0370 0.0327 0.0348
04:01-05:00, Sat., 04 Oct. 0.0377 0.0318 0.0347
03:01-04:00, Sat., 04 Oct. 0.0374 0.0328 0.0346
02:01-03:00, Sat., 04 Oct. 0.0373 0.0320 0.0347
01:01-02:00, Sat., 04 Oct. 0.0376 0.0318 0.0347
00:01-01:00, Sat., 04 Oct. 0.0373 0.0321 0.0347
23:01-24:00, Fri., 03 Oct. 0.0371 0.0320 0.0348
22:01-23:00, Fri., 03 Oct. 0.0370 0.0317 0.0347
21:01-22:00, Fri., 03 Oct. 0.0367 0.0326 0.0348
20:01-21:00, Fri., 03 Oct. 0.0366 0.0319 0.0342
19:01-20:00, Fri., 03 Oct. 0.0361 0.0309 0.0337
18:01-19:00, Fri., 03 Oct. 0.0362 0.0318 0.0339
17:01-18:00, Fri., 03 Oct. 0.0364 0.0325 0.0340
16:01-17:00, Fri., 03 Oct. 0.0372 0.0317 0.0342
15:01-16:00, Fri., 03 Oct. 0.0361 0.0325 0.0344
14:01-15:00, Fri., 03 Oct. 0.0371 0.0322 0.0345
13:01-14:00, Fri., 03 Oct. 0.0363 0.0326 0.0346
12:01-13:00, Fri., 03 Oct. 0.0372 0.0324 0.0345
11:01-12:00, Fri., 03 Oct. 0.0368 0.0314 0.0344
10:01-11:00, Fri., 03 Oct. 0.0367 0.0316 0.0341
09:01-10:00, Fri., 03 Oct. 0.0370 0.0321 0.0343
08:01-09:00, Fri., 03 Oct. 0.0370 0.0324 0.0345
07:01-08:00, Fri., 03 Oct. 0.0365 0.0319 0.0347
06:01-07:00, Fri., 03 Oct. 0.0371 0.0322 0.0345
05:01-06:00, Fri., 03 Oct. 0.0376 0.0325 0.0348
04:01-05:00, Fri., 03 Oct. 0.0380 0.0321 0.0344
03:01-04:00, Fri., 03 Oct. 0.0366 0.0312 0.0342
02:01-03:00, Fri., 03 Oct. 0.0372 0.0320 0.0343
01:01-02:00, Fri., 03 Oct. 0.0367 0.0324 0.0340
00:01-01:00, Fri., 03 Oct. 0.0359 0.0320 0.0340
23:01-24:00, Thu., 02 Oct. 0.0363 0.0319 0.0340
22:01-23:00, Thu., 02 Oct. 0.0367 0.0320 0.0343
21:01-22:00, Thu., 02 Oct. 0.0368 0.0315 0.0343
20:01-21:00, Thu., 02 Oct. 0.0366 0.0317 0.0343
19:01-20:00, Thu., 02 Oct. 0.0367 0.0317 0.0340
18:01-19:00, Thu., 02 Oct. 0.0363 0.0316 0.0336
17:01-18:00, Thu., 02 Oct. 0.0359 0.0309 0.0335
16:01-17:00, Thu., 02 Oct. 0.0368 0.0314 0.0340
15:01-16:00, Thu., 02 Oct. 0.0374 0.0312 0.0342
14:01-15:00, Thu., 02 Oct. 0.0360 0.0317 0.0339
13:01-14:00, Thu., 02 Oct. 0.0362 0.0309 0.0338
12:01-13:00, Thu., 02 Oct. 0.0364 0.0314 0.0340
11:01-12:00, Thu., 02 Oct. 0.0370 0.0318 0.0340
10:01-11:00, Thu., 02 Oct. 0.0367 0.0320 0.0345
09:01-10:00, Thu., 02 Oct. 0.0381 0.0321 0.0348
08:01-09:00, Thu., 02 Oct. 0.0378 0.0323 0.0347
07:01-08:00, Thu., 02 Oct. 0.0367 0.0320 0.0347
06:01-07:00, Thu., 02 Oct. 0.0370 0.0320 0.0342
05:01-06:00, Thu., 02 Oct. 0.0361 0.0316 0.0339
04:01-05:00, Thu., 02 Oct. 0.0367 0.0314 0.0341
03:01-04:00, Thu., 02 Oct. 0.0373 0.0325 0.0344
02:01-03:00, Thu., 02 Oct. 0.0374 0.0319 0.0345
01:01-02:00, Thu., 02 Oct. 0.0364 0.0325 0.0345
00:01-01:00, Thu., 02 Oct. 0.0370 0.0323 0.0343
23:01-24:00, Wed., 01 Oct. 0.0355 0.0317 0.0336
22:01-23:00, Wed., 01 Oct. 0.0359 0.0319 0.0338