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
01:01-02:00, Sun., 14 Dec. 0.0409 0.0356 0.0384
00:01-01:00, Sun., 14 Dec. 0.0417 0.0366 0.0392
23:01-24:00, Sat., 13 Dec. 0.0419 0.0376 0.0397
22:01-23:00, Sat., 13 Dec. 0.0440 0.0387 0.0411
21:01-22:00, Sat., 13 Dec. 0.0416 0.0368 0.0397
20:01-21:00, Sat., 13 Dec. 0.0411 0.0362 0.0387
19:01-20:00, Sat., 13 Dec. 0.0406 0.0365 0.0385
18:01-19:00, Sat., 13 Dec. 0.0399 0.0359 0.0377
17:01-18:00, Sat., 13 Dec. 0.0397 0.0353 0.0371
16:01-17:00, Sat., 13 Dec. 0.0395 0.0354 0.0374
15:01-16:00, Sat., 13 Dec. 0.0395 0.0353 0.0371
14:01-15:00, Sat., 13 Dec. 0.0392 0.0347 0.0373
13:01-14:00, Sat., 13 Dec. 0.0404 0.0352 0.0370
12:01-13:00, Sat., 13 Dec. 0.0391 0.0349 0.0372
11:01-12:00, Sat., 13 Dec. 0.0396 0.0350 0.0372
10:01-11:00, Sat., 13 Dec. 0.0390 0.0344 0.0369
09:01-10:00, Sat., 13 Dec. 0.0396 0.0346 0.0369
08:01-09:00, Sat., 13 Dec. 0.0392 0.0346 0.0370
07:01-08:00, Sat., 13 Dec. 0.0393 0.0346 0.0369
06:01-07:00, Sat., 13 Dec. 0.0395 0.0350 0.0372
05:01-06:00, Sat., 13 Dec. 0.0395 0.0345 0.0374
04:01-05:00, Sat., 13 Dec. 0.0394 0.0353 0.0374
03:01-04:00, Sat., 13 Dec. 0.0392 0.0350 0.0371
02:01-03:00, Sat., 13 Dec. 0.0391 0.0355 0.0372
01:01-02:00, Sat., 13 Dec. 0.0393 0.0347 0.0373
00:01-01:00, Sat., 13 Dec. 0.0392 0.0350 0.0373
23:01-24:00, Fri., 12 Dec. 0.0389 0.0352 0.0374
22:01-23:00, Fri., 12 Dec. 0.0391 0.0353 0.0373
21:01-22:00, Fri., 12 Dec. 0.0393 0.0352 0.0371
20:01-21:00, Fri., 12 Dec. 0.0393 0.0352 0.0372
19:01-20:00, Fri., 12 Dec. 0.0398 0.0347 0.0371
18:01-19:00, Fri., 12 Dec. 0.0398 0.0347 0.0370
17:01-18:00, Fri., 12 Dec. 0.0396 0.0343 0.0370
16:01-17:00, Fri., 12 Dec. 0.0391 0.0353 0.0371
15:01-16:00, Fri., 12 Dec. 0.0400 0.0355 0.0372
14:01-15:00, Fri., 12 Dec. 0.0391 0.0350 0.0370
13:01-14:00, Fri., 12 Dec. 0.0399 0.0350 0.0370
12:01-13:00, Fri., 12 Dec. 0.0402 0.0351 0.0372
11:01-12:00, Fri., 12 Dec. 0.0403 0.0353 0.0372
10:01-11:00, Fri., 12 Dec. 0.0398 0.0342 0.0374
09:01-10:00, Fri., 12 Dec. 0.0397 0.0357 0.0376
08:01-09:00, Fri., 12 Dec. 0.0398 0.0356 0.0376
07:01-08:00, Fri., 12 Dec. 0.0401 0.0359 0.0378
06:01-07:00, Fri., 12 Dec. 0.0396 0.0356 0.0378
05:01-06:00, Fri., 12 Dec. 0.0405 0.0361 0.0378
04:01-05:00, Fri., 12 Dec. 0.0401 0.0358 0.0378
03:01-04:00, Fri., 12 Dec. 0.0407 0.0356 0.0378
02:01-03:00, Fri., 12 Dec. 0.0401 0.0357 0.0378
01:01-02:00, Fri., 12 Dec. 0.0406 0.0351 0.0376
00:01-01:00, Fri., 12 Dec. 0.0404 0.0349 0.0374
23:01-24:00, Thu., 11 Dec. 0.0392 0.0360 0.0376
22:01-23:00, Thu., 11 Dec. 0.0395 0.0354 0.0375
21:01-22:00, Thu., 11 Dec. 0.0391 0.0356 0.0374
20:01-21:00, Thu., 11 Dec. 0.0391 0.0352 0.0375
19:01-20:00, Thu., 11 Dec. 0.0396 0.0353 0.0374
18:01-19:00, Thu., 11 Dec. 0.0391 0.0353 0.0373
17:01-18:00, Thu., 11 Dec. 0.0403 0.0351 0.0375
16:01-17:00, Thu., 11 Dec. 0.0394 0.0351 0.0372
15:01-16:00, Thu., 11 Dec. 0.0398 0.0347 0.0373
14:01-15:00, Thu., 11 Dec. 0.0390 0.0360 0.0374
13:01-14:00, Thu., 11 Dec. 0.0394 0.0348 0.0374
12:01-13:00, Thu., 11 Dec. 0.0402 0.0348 0.0377
11:01-12:00, Thu., 11 Dec. 0.0397 0.0356 0.0376
10:01-11:00, Thu., 11 Dec. 0.0397 0.0347 0.0377
09:01-10:00, Thu., 11 Dec. 0.0401 0.0353 0.0378
08:01-09:00, Thu., 11 Dec. 0.0405 0.0355 0.0379
07:01-08:00, Thu., 11 Dec. 0.0398 0.0360 0.0379
06:01-07:00, Thu., 11 Dec. 0.0400 0.0360 0.0379
05:01-06:00, Thu., 11 Dec. 0.0395 0.0357 0.0378
04:01-05:00, Thu., 11 Dec. 0.0402 0.0353 0.0376
03:01-04:00, Thu., 11 Dec. 0.0397 0.0353 0.0376
02:01-03:00, Thu., 11 Dec. 0.0397 0.0352 0.0375
01:01-02:00, Thu., 11 Dec. 0.0396 0.0349 0.0375
00:01-01:00, Thu., 11 Dec. 0.0394 0.0358 0.0373
23:01-24:00, Wed., 10 Dec. 0.0402 0.0351 0.0371
22:01-23:00, Wed., 10 Dec. 0.0394 0.0343 0.0373
21:01-22:00, Wed., 10 Dec. 0.0398 0.0352 0.0374
20:01-21:00, Wed., 10 Dec. 0.0393 0.0342 0.0370
19:01-20:00, Wed., 10 Dec. 0.0401 0.0353 0.0374
18:01-19:00, Wed., 10 Dec. 0.0394 0.0355 0.0374
17:01-18:00, Wed., 10 Dec. 0.0395 0.0357 0.0375
16:01-17:00, Wed., 10 Dec. 0.0395 0.0355 0.0376
15:01-16:00, Wed., 10 Dec. 0.0414 0.0351 0.0375
14:01-15:00, Wed., 10 Dec. 0.0398 0.0357 0.0376
13:01-14:00, Wed., 10 Dec. 0.0396 0.0358 0.0378
12:01-13:00, Wed., 10 Dec. 0.0394 0.0358 0.0375
11:01-12:00, Wed., 10 Dec. 0.0404 0.0357 0.0378
10:01-11:00, Wed., 10 Dec. 0.0400 0.0360 0.0381
09:01-10:00, Wed., 10 Dec. 0.0395 0.0355 0.0378
08:01-09:00, Wed., 10 Dec. 0.0396 0.0361 0.0378
07:01-08:00, Wed., 10 Dec. 0.0398 0.0355 0.0375
06:01-07:00, Wed., 10 Dec. 0.0393 0.0351 0.0375
05:01-06:00, Wed., 10 Dec. 0.0398 0.0342 0.0377
04:01-05:00, Wed., 10 Dec. 0.0399 0.0351 0.0374
03:01-04:00, Wed., 10 Dec. 0.0393 0.0355 0.0372
02:01-03:00, Wed., 10 Dec. 0.0395 0.0360 0.0375
01:01-02:00, Wed., 10 Dec. 0.0397 0.0343 0.0375
00:01-01:00, Wed., 10 Dec. 0.0399 0.0357 0.0374
23:01-24:00, Tue., 09 Dec. 0.0393 0.0349 0.0374
22:01-23:00, Tue., 09 Dec. 0.0398 0.0359 0.0376
21:01-22:00, Tue., 09 Dec. 0.0398 0.0357 0.0376
20:01-21:00, Tue., 09 Dec. 0.0391 0.0351 0.0373
19:01-20:00, Tue., 09 Dec. 0.0393 0.0347 0.0373
18:01-19:00, Tue., 09 Dec. 0.0402 0.0346 0.0372
17:01-18:00, Tue., 09 Dec. 0.0395 0.0346 0.0374
16:01-17:00, Tue., 09 Dec. 0.0392 0.0353 0.0374
15:01-16:00, Tue., 09 Dec. 0.0395 0.0346 0.0376
14:01-15:00, Tue., 09 Dec. 0.0395 0.0351 0.0376
13:01-14:00, Tue., 09 Dec. 0.0397 0.0352 0.0374
12:01-13:00, Tue., 09 Dec. 0.0399 0.0349 0.0375
11:01-12:00, Tue., 09 Dec. 0.0395 0.0356 0.0375
10:01-11:00, Tue., 09 Dec. 0.0397 0.0360 0.0377
09:01-10:00, Tue., 09 Dec. 0.0394 0.0357 0.0375
08:01-09:00, Tue., 09 Dec. 0.0393 0.0354 0.0374
07:01-08:00, Tue., 09 Dec. 0.0397 0.0352 0.0376
06:01-07:00, Tue., 09 Dec. 0.0394 0.0357 0.0376
05:01-06:00, Tue., 09 Dec. 0.0409 0.0350 0.0377
04:01-05:00, Tue., 09 Dec. 0.0402 0.0357 0.0380
03:01-04:00, Tue., 09 Dec. 0.0395 0.0352 0.0377
02:01-03:00, Tue., 09 Dec. 0.0398 0.0354 0.0380
01:01-02:00, Tue., 09 Dec. 0.0405 0.0361 0.0378
00:01-01:00, Tue., 09 Dec. 0.0410 0.0361 0.0380
23:01-24:00, Mon., 08 Dec. 0.0404 0.0353 0.0377
22:01-23:00, Mon., 08 Dec. 0.0405 0.0359 0.0378
21:01-22:00, Mon., 08 Dec. 0.0393 0.0345 0.0375
20:01-21:00, Mon., 08 Dec. 0.0402 0.0363 0.0378
19:01-20:00, Mon., 08 Dec. 0.0398 0.0347 0.0371
18:01-19:00, Mon., 08 Dec. 0.0401 0.0347 0.0375
17:01-18:00, Mon., 08 Dec. 0.0397 0.0351 0.0374
16:01-17:00, Mon., 08 Dec. 0.0401 0.0347 0.0374
15:01-16:00, Mon., 08 Dec. 0.0396 0.0354 0.0374
14:01-15:00, Mon., 08 Dec. 0.0397 0.0350 0.0373
13:01-14:00, Mon., 08 Dec. 0.0387 0.0355 0.0373
12:01-13:00, Mon., 08 Dec. 0.0398 0.0347 0.0377
11:01-12:00, Mon., 08 Dec. 0.0392 0.0348 0.0376
10:01-11:00, Mon., 08 Dec. 0.0401 0.0356 0.0378
09:01-10:00, Mon., 08 Dec. 0.0405 0.0359 0.0382
08:01-09:00, Mon., 08 Dec. 0.0403 0.0360 0.0380
07:01-08:00, Mon., 08 Dec. 0.0409 0.0357 0.0383
06:01-07:00, Mon., 08 Dec. 0.0405 0.0361 0.0380
05:01-06:00, Mon., 08 Dec. 0.0402 0.0361 0.0378
04:01-05:00, Mon., 08 Dec. 0.0397 0.0357 0.0381
03:01-04:00, Mon., 08 Dec. 0.0402 0.0358 0.0379
02:01-03:00, Mon., 08 Dec. 0.0408 0.0350 0.0379
01:01-02:00, Mon., 08 Dec. 0.0405 0.0354 0.0378
00:01-01:00, Mon., 08 Dec. 0.0390 0.0351 0.0375
23:01-24:00, Sun., 07 Dec. 0.0406 0.0351 0.0377
22:01-23:00, Sun., 07 Dec. 0.0397 0.0349 0.0376
21:01-22:00, Sun., 07 Dec. 0.0395 0.0349 0.0375
20:01-21:00, Sun., 07 Dec. 0.0394 0.0354 0.0375
19:01-20:00, Sun., 07 Dec. 0.0391 0.0353 0.0374
18:01-19:00, Sun., 07 Dec. 0.0395 0.0350 0.0374
17:01-18:00, Sun., 07 Dec. 0.0402 0.0355 0.0377
16:01-17:00, Sun., 07 Dec. 0.0396 0.0347 0.0371
15:01-16:00, Sun., 07 Dec. 0.0395 0.0352 0.0377
14:01-15:00, Sun., 07 Dec. 0.0399 0.0354 0.0376
13:01-14:00, Sun., 07 Dec. 0.0406 0.0349 0.0378
12:01-13:00, Sun., 07 Dec. 0.0405 0.0362 0.0381
11:01-12:00, Sun., 07 Dec. 0.0397 0.0363 0.0382
10:01-11:00, Sun., 07 Dec. 0.0398 0.0353 0.0379
09:01-10:00, Sun., 07 Dec. 0.0403 0.0349 0.0382
08:01-09:00, Sun., 07 Dec. 0.0406 0.0360 0.0384
07:01-08:00, Sun., 07 Dec. 0.0410 0.0362 0.0382
06:01-07:00, Sun., 07 Dec. 0.0401 0.0357 0.0381
05:01-06:00, Sun., 07 Dec. 0.0402 0.0359 0.0380
04:01-05:00, Sun., 07 Dec. 0.0398 0.0353 0.0379
03:01-04:00, Sun., 07 Dec. 0.0396 0.0347 0.0377
02:01-03:00, Sun., 07 Dec. 0.0396 0.0358 0.0377
01:01-02:00, Sun., 07 Dec. 0.0409 0.0360 0.0379
00:01-01:00, Sun., 07 Dec. 0.0405 0.0355 0.0377
23:01-24:00, Sat., 06 Dec. 0.0402 0.0359 0.0377
22:01-23:00, Sat., 06 Dec. 0.0396 0.0351 0.0375
21:01-22:00, Sat., 06 Dec. 0.0396 0.0347 0.0375
20:01-21:00, Sat., 06 Dec. 0.0394 0.0353 0.0374
19:01-20:00, Sat., 06 Dec. 0.0395 0.0350 0.0372
18:01-19:00, Sat., 06 Dec. 0.0395 0.0348 0.0374
17:01-18:00, Sat., 06 Dec. 0.0404 0.0346 0.0372
16:01-17:00, Sat., 06 Dec. 0.0392 0.0349 0.0372
15:01-16:00, Sat., 06 Dec. 0.0396 0.0353 0.0372
14:01-15:00, Sat., 06 Dec. 0.0395 0.0356 0.0373
13:01-14:00, Sat., 06 Dec. 0.0390 0.0349 0.0372
12:01-13:00, Sat., 06 Dec. 0.0397 0.0351 0.0374
11:01-12:00, Sat., 06 Dec. 0.0397 0.0354 0.0376
10:01-11:00, Sat., 06 Dec. 0.0394 0.0357 0.0375
09:01-10:00, Sat., 06 Dec. 0.0401 0.0353 0.0376
08:01-09:00, Sat., 06 Dec. 0.0398 0.0357 0.0378
07:01-08:00, Sat., 06 Dec. 0.0404 0.0357 0.0375
06:01-07:00, Sat., 06 Dec. 0.0402 0.0358 0.0379
05:01-06:00, Sat., 06 Dec. 0.0401 0.0351 0.0375
04:01-05:00, Sat., 06 Dec. 0.0408 0.0349 0.0374
03:01-04:00, Sat., 06 Dec. 0.0395 0.0350 0.0374
02:01-03:00, Sat., 06 Dec. 0.0400 0.0361 0.0376
01:01-02:00, Sat., 06 Dec. 0.0395 0.0348 0.0376
00:01-01:00, Sat., 06 Dec. 0.0397 0.0353 0.0376
23:01-24:00, Fri., 05 Dec. 0.0400 0.0356 0.0374
22:01-23:00, Fri., 05 Dec. 0.0389 0.0350 0.0373
21:01-22:00, Fri., 05 Dec. 0.0395 0.0353 0.0375
20:01-21:00, Fri., 05 Dec. 0.0397 0.0350 0.0373
19:01-20:00, Fri., 05 Dec. 0.0405 0.0346 0.0374
18:01-19:00, Fri., 05 Dec. 0.0391 0.0351 0.0375
17:01-18:00, Fri., 05 Dec. 0.0389 0.0354 0.0373
16:01-17:00, Fri., 05 Dec. 0.0395 0.0353 0.0374
15:01-16:00, Fri., 05 Dec. 0.0399 0.0352 0.0373
14:01-15:00, Fri., 05 Dec. 0.0395 0.0345 0.0374
13:01-14:00, Fri., 05 Dec. 0.0395 0.0348 0.0376
12:01-13:00, Fri., 05 Dec. 0.0395 0.0352 0.0374
11:01-12:00, Fri., 05 Dec. 0.0395 0.0345 0.0375
10:01-11:00, Fri., 05 Dec. 0.0400 0.0357 0.0376
09:01-10:00, Fri., 05 Dec. 0.0401 0.0354 0.0376
08:01-09:00, Fri., 05 Dec. 0.0399 0.0358 0.0377
07:01-08:00, Fri., 05 Dec. 0.0395 0.0359 0.0378
06:01-07:00, Fri., 05 Dec. 0.0402 0.0360 0.0378
05:01-06:00, Fri., 05 Dec. 0.0396 0.0346 0.0376
04:01-05:00, Fri., 05 Dec. 0.0407 0.0355 0.0375
03:01-04:00, Fri., 05 Dec. 0.0388 0.0352 0.0369
02:01-03:00, Fri., 05 Dec. 0.0395 0.0354 0.0370
01:01-02:00, Fri., 05 Dec. 0.0391 0.0351 0.0372
00:01-01:00, Fri., 05 Dec. 0.0388 0.0349 0.0371
23:01-24:00, Thu., 04 Dec. 0.0386 0.0347 0.0369
22:01-23:00, Thu., 04 Dec. 0.0393 0.0350 0.0370
21:01-22:00, Thu., 04 Dec. 0.0386 0.0350 0.0368
20:01-21:00, Thu., 04 Dec. 0.0393 0.0345 0.0369
19:01-20:00, Thu., 04 Dec. 0.0389 0.0345 0.0369
18:01-19:00, Thu., 04 Dec. 0.0391 0.0340 0.0369
17:01-18:00, Thu., 04 Dec. 0.0389 0.0340 0.0370
16:01-17:00, Thu., 04 Dec. 0.0399 0.0346 0.0372
15:01-16:00, Thu., 04 Dec. 0.0389 0.0355 0.0374
14:01-15:00, Thu., 04 Dec. 0.0391 0.0355 0.0374
13:01-14:00, Thu., 04 Dec. 0.0399 0.0353 0.0373
12:01-13:00, Thu., 04 Dec. 0.0402 0.0353 0.0375
11:01-12:00, Thu., 04 Dec. 0.0391 0.0353 0.0375
10:01-11:00, Thu., 04 Dec. 0.0394 0.0350 0.0374
09:01-10:00, Thu., 04 Dec. 0.0402 0.0352 0.0373
08:01-09:00, Thu., 04 Dec. 0.0392 0.0353 0.0376
07:01-08:00, Thu., 04 Dec. 0.0399 0.0358 0.0376
06:01-07:00, Thu., 04 Dec. 0.0398 0.0343 0.0373
05:01-06:00, Thu., 04 Dec. 0.0401 0.0347 0.0374
04:01-05:00, Thu., 04 Dec. 0.0391 0.0355 0.0374
03:01-04:00, Thu., 04 Dec. 0.0396 0.0351 0.0374
02:01-03:00, Thu., 04 Dec. 0.0404 0.0348 0.0376