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

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
19:01-20:00, Fri., 13 Feb. 0.0393 0.0352 0.0372
18:01-19:00, Fri., 13 Feb. 0.0396 0.0351 0.0374
17:01-18:00, Fri., 13 Feb. 0.0390 0.0345 0.0371
16:01-17:00, Fri., 13 Feb. 0.0390 0.0354 0.0375
15:01-16:00, Fri., 13 Feb. 0.0391 0.0351 0.0374
14:01-15:00, Fri., 13 Feb. 0.0390 0.0353 0.0372
13:01-14:00, Fri., 13 Feb. 0.0393 0.0353 0.0373
12:01-13:00, Fri., 13 Feb. 0.0395 0.0347 0.0374
11:01-12:00, Fri., 13 Feb. 0.0391 0.0347 0.0374
10:01-11:00, Fri., 13 Feb. 0.0395 0.0350 0.0375
09:01-10:00, Fri., 13 Feb. 0.0402 0.0351 0.0376
08:01-09:00, Fri., 13 Feb. 0.0402 0.0345 0.0379
07:01-08:00, Fri., 13 Feb. 0.0402 0.0355 0.0379
06:01-07:00, Fri., 13 Feb. 0.0394 0.0352 0.0373
05:01-06:00, Fri., 13 Feb. 0.0398 0.0360 0.0376
04:01-05:00, Fri., 13 Feb. 0.0407 0.0354 0.0379
03:01-04:00, Fri., 13 Feb. 0.0401 0.0361 0.0376
02:01-03:00, Fri., 13 Feb. 0.0395 0.0353 0.0374
01:01-02:00, Fri., 13 Feb. 0.0397 0.0350 0.0375
00:01-01:00, Fri., 13 Feb. 0.0409 0.0357 0.0375
23:01-24:00, Thu., 12 Feb. 0.0389 0.0354 0.0375
22:01-23:00, Thu., 12 Feb. 0.0406 0.0359 0.0374
21:01-22:00, Thu., 12 Feb. 0.0397 0.0357 0.0374
20:01-21:00, Thu., 12 Feb. 0.0389 0.0357 0.0375
19:01-20:00, Thu., 12 Feb. 0.0399 0.0349 0.0373
18:01-19:00, Thu., 12 Feb. 0.0392 0.0350 0.0373
17:01-18:00, Thu., 12 Feb. 0.0395 0.0346 0.0372
16:01-17:00, Thu., 12 Feb. 0.0402 0.0354 0.0372
15:01-16:00, Thu., 12 Feb. 0.0396 0.0357 0.0374
14:01-15:00, Thu., 12 Feb. 0.0395 0.0358 0.0374
13:01-14:00, Thu., 12 Feb. 0.0398 0.0357 0.0373
12:01-13:00, Thu., 12 Feb. 0.0395 0.0355 0.0373
11:01-12:00, Thu., 12 Feb. 0.0393 0.0340 0.0372
10:01-11:00, Thu., 12 Feb. 0.0392 0.0350 0.0372
09:01-10:00, Thu., 12 Feb. 0.0394 0.0349 0.0373
08:01-09:00, Thu., 12 Feb. 0.0403 0.0353 0.0373
07:01-08:00, Thu., 12 Feb. 0.0396 0.0356 0.0374
06:01-07:00, Thu., 12 Feb. 0.0395 0.0356 0.0375
05:01-06:00, Thu., 12 Feb. 0.0405 0.0355 0.0375
04:01-05:00, Thu., 12 Feb. 0.0394 0.0339 0.0373
03:01-04:00, Thu., 12 Feb. 0.0391 0.0350 0.0372
02:01-03:00, Thu., 12 Feb. 0.0395 0.0345 0.0375
01:01-02:00, Thu., 12 Feb. 0.0401 0.0355 0.0375
00:01-01:00, Thu., 12 Feb. 0.0400 0.0353 0.0371
23:01-24:00, Wed., 11 Feb. 0.0397 0.0355 0.0373
22:01-23:00, Wed., 11 Feb. 0.0395 0.0347 0.0371
21:01-22:00, Wed., 11 Feb. 0.0390 0.0343 0.0372
20:01-21:00, Wed., 11 Feb. 0.0395 0.0354 0.0372
19:01-20:00, Wed., 11 Feb. 0.0404 0.0348 0.0375
18:01-19:00, Wed., 11 Feb. 0.0403 0.0360 0.0380
17:01-18:00, Wed., 11 Feb. 0.0419 0.0367 0.0397
16:01-17:00, Wed., 11 Feb. 0.0430 0.0361 0.0395
15:01-16:00, Wed., 11 Feb. 0.0398 0.0352 0.0376
14:01-15:00, Wed., 11 Feb. 0.0407 0.0364 0.0386
13:01-14:00, Wed., 11 Feb. 0.0436 0.0378 0.0404
12:01-13:00, Wed., 11 Feb. 0.0516 0.0414 0.0469
11:01-12:00, Wed., 11 Feb. 0.0512 0.0448 0.0484
10:01-11:00, Wed., 11 Feb. 0.0520 0.0472 0.0498
09:01-10:00, Wed., 11 Feb. 0.0526 0.0467 0.0493
08:01-09:00, Wed., 11 Feb. 0.0492 0.0431 0.0459
07:01-08:00, Wed., 11 Feb. 0.0465 0.0403 0.0437
06:01-07:00, Wed., 11 Feb. 0.0433 0.0378 0.0409
05:01-06:00, Wed., 11 Feb. 0.0418 0.0348 0.0380
04:01-05:00, Wed., 11 Feb. 0.0395 0.0352 0.0375
03:01-04:00, Wed., 11 Feb. 0.0395 0.0357 0.0375
02:01-03:00, Wed., 11 Feb. 0.0398 0.0351 0.0374
01:01-02:00, Wed., 11 Feb. 0.0397 0.0353 0.0375
00:01-01:00, Wed., 11 Feb. 0.0395 0.0352 0.0378
23:01-24:00, Tue., 10 Feb. 0.0402 0.0359 0.0376
22:01-23:00, Tue., 10 Feb. 0.0396 0.0357 0.0377
21:01-22:00, Tue., 10 Feb. 0.0402 0.0356 0.0378
20:01-21:00, Tue., 10 Feb. 0.0398 0.0354 0.0376
19:01-20:00, Tue., 10 Feb. 0.0395 0.0355 0.0376
18:01-19:00, Tue., 10 Feb. 0.0403 0.0345 0.0376
17:01-18:00, Tue., 10 Feb. 0.0391 0.0353 0.0375
16:01-17:00, Tue., 10 Feb. 0.0393 0.0356 0.0374
15:01-16:00, Tue., 10 Feb. 0.0401 0.0353 0.0372
14:01-15:00, Tue., 10 Feb. 0.0387 0.0354 0.0374
13:01-14:00, Tue., 10 Feb. 0.0407 0.0353 0.0374
12:01-13:00, Tue., 10 Feb. 0.0391 0.0354 0.0375
11:01-12:00, Tue., 10 Feb. 0.0398 0.0350 0.0376
10:01-11:00, Tue., 10 Feb. 0.0402 0.0359 0.0376
09:01-10:00, Tue., 10 Feb. 0.0400 0.0354 0.0377
08:01-09:00, Tue., 10 Feb. 0.0399 0.0351 0.0376
07:01-08:00, Tue., 10 Feb. 0.0401 0.0356 0.0375
06:01-07:00, Tue., 10 Feb. 0.0399 0.0350 0.0374
05:01-06:00, Tue., 10 Feb. 0.0399 0.0356 0.0375
04:01-05:00, Tue., 10 Feb. 0.0397 0.0348 0.0376
03:01-04:00, Tue., 10 Feb. 0.0401 0.0355 0.0372
02:01-03:00, Tue., 10 Feb. 0.0391 0.0354 0.0372
01:01-02:00, Tue., 10 Feb. 0.0395 0.0357 0.0374
00:01-01:00, Tue., 10 Feb. 0.0391 0.0354 0.0374
23:01-24:00, Mon., 09 Feb. 0.0394 0.0353 0.0371
22:01-23:00, Mon., 09 Feb. 0.0397 0.0352 0.0374
21:01-22:00, Mon., 09 Feb. 0.0396 0.0349 0.0374
20:01-21:00, Mon., 09 Feb. 0.0398 0.0355 0.0374
19:01-20:00, Mon., 09 Feb. 0.0396 0.0355 0.0373
18:01-19:00, Mon., 09 Feb. 0.0389 0.0350 0.0372
17:01-18:00, Mon., 09 Feb. 0.0392 0.0351 0.0374
16:01-17:00, Mon., 09 Feb. 0.0396 0.0346 0.0374
15:01-16:00, Mon., 09 Feb. 0.0409 0.0357 0.0377
14:01-15:00, Mon., 09 Feb. 0.0398 0.0351 0.0374
13:01-14:00, Mon., 09 Feb. 0.0399 0.0357 0.0375
12:01-13:00, Mon., 09 Feb. 0.0399 0.0351 0.0375
11:01-12:00, Mon., 09 Feb. 0.0395 0.0360 0.0377
10:01-11:00, Mon., 09 Feb. 0.0399 0.0343 0.0376
09:01-10:00, Mon., 09 Feb. 0.0398 0.0351 0.0377
08:01-09:00, Mon., 09 Feb. 0.0397 0.0353 0.0373
07:01-08:00, Mon., 09 Feb. 0.0402 0.0357 0.0377
06:01-07:00, Mon., 09 Feb. 0.0399 0.0354 0.0380
05:01-06:00, Mon., 09 Feb. 0.0401 0.0360 0.0380
04:01-05:00, Mon., 09 Feb. 0.0399 0.0353 0.0380
03:01-04:00, Mon., 09 Feb. 0.0398 0.0343 0.0376
02:01-03:00, Mon., 09 Feb. 0.0399 0.0363 0.0378
01:01-02:00, Mon., 09 Feb. 0.0399 0.0355 0.0379
00:01-01:00, Mon., 09 Feb. 0.0399 0.0360 0.0381
23:01-24:00, Sun., 08 Feb. 0.0404 0.0364 0.0379
22:01-23:00, Sun., 08 Feb. 0.0402 0.0360 0.0378
21:01-22:00, Sun., 08 Feb. 0.0415 0.0352 0.0376
20:01-21:00, Sun., 08 Feb. 0.0396 0.0353 0.0374
19:01-20:00, Sun., 08 Feb. 0.0405 0.0351 0.0378
18:01-19:00, Sun., 08 Feb. 0.0401 0.0350 0.0376
17:01-18:00, Sun., 08 Feb. 0.0396 0.0353 0.0377
16:01-17:00, Sun., 08 Feb. 0.0402 0.0354 0.0376
15:01-16:00, Sun., 08 Feb. 0.0401 0.0361 0.0376
14:01-15:00, Sun., 08 Feb. 0.0398 0.0362 0.0377
13:01-14:00, Sun., 08 Feb. 0.0410 0.0363 0.0384
12:01-13:00, Sun., 08 Feb. 0.0419 0.0368 0.0395
11:01-12:00, Sun., 08 Feb. 0.0422 0.0376 0.0398
10:01-11:00, Sun., 08 Feb. 0.0429 0.0380 0.0400
09:01-10:00, Sun., 08 Feb. 0.0407 0.0367 0.0386
08:01-09:00, Sun., 08 Feb. 0.0415 0.0365 0.0391
07:01-08:00, Sun., 08 Feb. 0.0416 0.0366 0.0394
06:01-07:00, Sun., 08 Feb. 0.0424 0.0378 0.0401
05:01-06:00, Sun., 08 Feb. 0.0411 0.0365 0.0387
04:01-05:00, Sun., 08 Feb. 0.0420 0.0374 0.0396
03:01-04:00, Sun., 08 Feb. 0.0428 0.0361 0.0399
02:01-03:00, Sun., 08 Feb. 0.0419 0.0374 0.0394
01:01-02:00, Sun., 08 Feb. 0.0410 0.0357 0.0387
00:01-01:00, Sun., 08 Feb. 0.0405 0.0360 0.0384
23:01-24:00, Sat., 07 Feb. 0.0416 0.0371 0.0394
22:01-23:00, Sat., 07 Feb. 0.0417 0.0375 0.0397
21:01-22:00, Sat., 07 Feb. 0.0410 0.0361 0.0390
20:01-21:00, Sat., 07 Feb. 0.0409 0.0356 0.0380
19:01-20:00, Sat., 07 Feb. 0.0411 0.0354 0.0378
18:01-19:00, Sat., 07 Feb. 0.0405 0.0353 0.0380
17:01-18:00, Sat., 07 Feb. 0.0402 0.0358 0.0381
16:01-17:00, Sat., 07 Feb. 0.0422 0.0373 0.0396
15:01-16:00, Sat., 07 Feb. 0.0436 0.0395 0.0414
14:01-15:00, Sat., 07 Feb. 0.0429 0.0367 0.0404
13:01-14:00, Sat., 07 Feb. 0.0418 0.0367 0.0394
12:01-13:00, Sat., 07 Feb. 0.0404 0.0355 0.0381
11:01-12:00, Sat., 07 Feb. 0.0405 0.0366 0.0383
10:01-11:00, Sat., 07 Feb. 0.0407 0.0368 0.0387
09:01-10:00, Sat., 07 Feb. 0.0404 0.0371 0.0387
08:01-09:00, Sat., 07 Feb. 0.0405 0.0360 0.0382
07:01-08:00, Sat., 07 Feb. 0.0402 0.0350 0.0380
06:01-07:00, Sat., 07 Feb. 0.0402 0.0355 0.0381
05:01-06:00, Sat., 07 Feb. 0.0406 0.0354 0.0382
04:01-05:00, Sat., 07 Feb. 0.0409 0.0358 0.0381
03:01-04:00, Sat., 07 Feb. 0.0406 0.0359 0.0381
02:01-03:00, Sat., 07 Feb. 0.0403 0.0356 0.0382
01:01-02:00, Sat., 07 Feb. 0.0406 0.0360 0.0381
00:01-01:00, Sat., 07 Feb. 0.0402 0.0362 0.0379
23:01-24:00, Fri., 06 Feb. 0.0405 0.0359 0.0377
22:01-23:00, Fri., 06 Feb. 0.0400 0.0359 0.0380
21:01-22:00, Fri., 06 Feb. 0.0411 0.0359 0.0381
20:01-21:00, Fri., 06 Feb. 0.0396 0.0359 0.0377
19:01-20:00, Fri., 06 Feb. 0.0401 0.0360 0.0379
18:01-19:00, Fri., 06 Feb. 0.0401 0.0349 0.0379
17:01-18:00, Fri., 06 Feb. 0.0398 0.0356 0.0375
16:01-17:00, Fri., 06 Feb. 0.0397 0.0352 0.0379
15:01-16:00, Fri., 06 Feb. 0.0402 0.0358 0.0379
14:01-15:00, Fri., 06 Feb. 0.0411 0.0361 0.0380
13:01-14:00, Fri., 06 Feb. 0.0401 0.0360 0.0383
12:01-13:00, Fri., 06 Feb. 0.0404 0.0355 0.0381
11:01-12:00, Fri., 06 Feb. 0.0409 0.0363 0.0382
10:01-11:00, Fri., 06 Feb. 0.0409 0.0361 0.0385
09:01-10:00, Fri., 06 Feb. 0.0407 0.0357 0.0382
08:01-09:00, Fri., 06 Feb. 0.0418 0.0362 0.0382
07:01-08:00, Fri., 06 Feb. 0.0407 0.0362 0.0384
06:01-07:00, Fri., 06 Feb. 0.0408 0.0364 0.0385
05:01-06:00, Fri., 06 Feb. 0.0400 0.0363 0.0383
04:01-05:00, Fri., 06 Feb. 0.0399 0.0360 0.0382
03:01-04:00, Fri., 06 Feb. 0.0400 0.0363 0.0379
02:01-03:00, Fri., 06 Feb. 0.0406 0.0353 0.0379
01:01-02:00, Fri., 06 Feb. 0.0411 0.0356 0.0381
00:01-01:00, Fri., 06 Feb. 0.0398 0.0352 0.0379
23:01-24:00, Thu., 05 Feb. 0.0393 0.0353 0.0376
22:01-23:00, Thu., 05 Feb. 0.0405 0.0359 0.0379
21:01-22:00, Thu., 05 Feb. 0.0397 0.0352 0.0376
20:01-21:00, Thu., 05 Feb. 0.0401 0.0353 0.0377
19:01-20:00, Thu., 05 Feb. 0.0406 0.0352 0.0378
18:01-19:00, Thu., 05 Feb. 0.0397 0.0364 0.0379
17:01-18:00, Thu., 05 Feb. 0.0399 0.0356 0.0376
16:01-17:00, Thu., 05 Feb. 0.0401 0.0356 0.0377
15:01-16:00, Thu., 05 Feb. 0.0400 0.0357 0.0377
14:01-15:00, Thu., 05 Feb. 0.0398 0.0338 0.0376
13:01-14:00, Thu., 05 Feb. 0.0408 0.0355 0.0379
12:01-13:00, Thu., 05 Feb. 0.0407 0.0359 0.0380
11:01-12:00, Thu., 05 Feb. 0.0402 0.0363 0.0383
10:01-11:00, Thu., 05 Feb. 0.0402 0.0361 0.0384
09:01-10:00, Thu., 05 Feb. 0.0412 0.0362 0.0387
08:01-09:00, Thu., 05 Feb. 0.0403 0.0357 0.0382
07:01-08:00, Thu., 05 Feb. 0.0412 0.0360 0.0385
06:01-07:00, Thu., 05 Feb. 0.0401 0.0364 0.0383
05:01-06:00, Thu., 05 Feb. 0.0405 0.0362 0.0381
04:01-05:00, Thu., 05 Feb. 0.0395 0.0359 0.0381
03:01-04:00, Thu., 05 Feb. 0.0405 0.0356 0.0380
02:01-03:00, Thu., 05 Feb. 0.0400 0.0357 0.0382
01:01-02:00, Thu., 05 Feb. 0.0401 0.0359 0.0378
00:01-01:00, Thu., 05 Feb. 0.0395 0.0356 0.0380
23:01-24:00, Wed., 04 Feb. 0.0405 0.0353 0.0378
22:01-23:00, Wed., 04 Feb. 0.0395 0.0358 0.0379
21:01-22:00, Wed., 04 Feb. 0.0396 0.0353 0.0378
20:01-21:00, Wed., 04 Feb. 0.0395 0.0358 0.0377
19:01-20:00, Wed., 04 Feb. 0.0413 0.0359 0.0377
18:01-19:00, Wed., 04 Feb. 0.0395 0.0353 0.0376
17:01-18:00, Wed., 04 Feb. 0.0400 0.0346 0.0379
16:01-17:00, Wed., 04 Feb. 0.0405 0.0350 0.0377
15:01-16:00, Wed., 04 Feb. 0.0394 0.0352 0.0375
14:01-15:00, Wed., 04 Feb. 0.0398 0.0353 0.0378
13:01-14:00, Wed., 04 Feb. 0.0401 0.0360 0.0379
12:01-13:00, Wed., 04 Feb. 0.0397 0.0353 0.0375
11:01-12:00, Wed., 04 Feb. 0.0403 0.0362 0.0379
10:01-11:00, Wed., 04 Feb. 0.0401 0.0360 0.0379
09:01-10:00, Wed., 04 Feb. 0.0400 0.0353 0.0381
08:01-09:00, Wed., 04 Feb. 0.0405 0.0360 0.0379
07:01-08:00, Wed., 04 Feb. 0.0402 0.0358 0.0380
06:01-07:00, Wed., 04 Feb. 0.0399 0.0355 0.0379
05:01-06:00, Wed., 04 Feb. 0.0408 0.0359 0.0381
04:01-05:00, Wed., 04 Feb. 0.0407 0.0358 0.0380
03:01-04:00, Wed., 04 Feb. 0.0405 0.0351 0.0378
02:01-03:00, Wed., 04 Feb. 0.0391 0.0356 0.0375
01:01-02:00, Wed., 04 Feb. 0.0408 0.0357 0.0377
00:01-01:00, Wed., 04 Feb. 0.0398 0.0358 0.0376
23:01-24:00, Tue., 03 Feb. 0.0394 0.0358 0.0376
22:01-23:00, Tue., 03 Feb. 0.0400 0.0355 0.0377
21:01-22:00, Tue., 03 Feb. 0.0398 0.0348 0.0374
20:01-21:00, Tue., 03 Feb. 0.0394 0.0345 0.0375