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
21:01-22:00, Sat., 29 Mar. 0.0380 0.0346 0.0364
20:01-21:00, Sat., 29 Mar. 0.0395 0.0350 0.0369
19:01-20:00, Sat., 29 Mar. 0.0402 0.0345 0.0376
18:01-19:00, Sat., 29 Mar. 0.0418 0.0371 0.0393
17:01-18:00, Sat., 29 Mar. 0.0424 0.0363 0.0388
16:01-17:00, Sat., 29 Mar. 0.0398 0.0351 0.0378
15:01-16:00, Sat., 29 Mar. 0.0412 0.0360 0.0389
14:01-15:00, Sat., 29 Mar. 0.0437 0.0388 0.0415
13:01-14:00, Sat., 29 Mar. 0.0442 0.0398 0.0420
12:01-13:00, Sat., 29 Mar. 0.0467 0.0404 0.0430
11:01-12:00, Sat., 29 Mar. 0.0464 0.0416 0.0440
10:01-11:00, Sat., 29 Mar. 0.0474 0.0389 0.0436
09:01-10:00, Sat., 29 Mar. 0.0504 0.0399 0.0449
08:01-09:00, Sat., 29 Mar. 0.0530 0.0447 0.0492
07:01-08:00, Sat., 29 Mar. 0.0495 0.0433 0.0464
06:01-07:00, Sat., 29 Mar. 0.0459 0.0390 0.0423
05:01-06:00, Sat., 29 Mar. 0.0417 0.0362 0.0390
04:01-05:00, Sat., 29 Mar. 0.0400 0.0342 0.0369
03:01-04:00, Sat., 29 Mar. 0.0390 0.0349 0.0371
02:01-03:00, Sat., 29 Mar. 0.0391 0.0347 0.0370
01:01-02:00, Sat., 29 Mar. 0.0398 0.0347 0.0377
00:01-01:00, Sat., 29 Mar. 0.0429 0.0374 0.0404
23:01-24:00, Fri., 28 Mar. 0.0434 0.0360 0.0403
22:01-23:00, Fri., 28 Mar. 0.0402 0.0357 0.0372
21:01-22:00, Fri., 28 Mar. 0.0393 0.0341 0.0369
20:01-21:00, Fri., 28 Mar. 0.0394 0.0345 0.0371
19:01-20:00, Fri., 28 Mar. 0.0387 0.0345 0.0367
18:01-19:00, Fri., 28 Mar. 0.0388 0.0335 0.0366
17:01-18:00, Fri., 28 Mar. 0.0384 0.0347 0.0368
16:01-17:00, Fri., 28 Mar. 0.0391 0.0347 0.0366
15:01-16:00, Fri., 28 Mar. 0.0389 0.0349 0.0369
14:01-15:00, Fri., 28 Mar. 0.0393 0.0340 0.0366
13:01-14:00, Fri., 28 Mar. 0.0387 0.0343 0.0366
12:01-13:00, Fri., 28 Mar. 0.0391 0.0343 0.0367
11:01-12:00, Fri., 28 Mar. 0.0391 0.0347 0.0370
10:01-11:00, Fri., 28 Mar. 0.0416 0.0353 0.0384
09:01-10:00, Fri., 28 Mar. 0.0470 0.0397 0.0432
08:01-09:00, Fri., 28 Mar. 0.0509 0.0443 0.0473
07:01-08:00, Fri., 28 Mar. 0.0468 0.0397 0.0435
06:01-07:00, Fri., 28 Mar. 0.0431 0.0374 0.0411
05:01-06:00, Fri., 28 Mar. 0.0395 0.0347 0.0370
04:01-05:00, Fri., 28 Mar. 0.0395 0.0336 0.0370
03:01-04:00, Fri., 28 Mar. 0.0405 0.0349 0.0372
02:01-03:00, Fri., 28 Mar. 0.0390 0.0344 0.0369
01:01-02:00, Fri., 28 Mar. 0.0390 0.0347 0.0370
00:01-01:00, Fri., 28 Mar. 0.0397 0.0345 0.0369
23:01-24:00, Thu., 27 Mar. 0.0400 0.0349 0.0370
22:01-23:00, Thu., 27 Mar. 0.0389 0.0341 0.0368
21:01-22:00, Thu., 27 Mar. 0.0387 0.0349 0.0369
20:01-21:00, Thu., 27 Mar. 0.0397 0.0348 0.0370
19:01-20:00, Thu., 27 Mar. 0.0385 0.0348 0.0368
18:01-19:00, Thu., 27 Mar. 0.0398 0.0350 0.0368
17:01-18:00, Thu., 27 Mar. 0.0388 0.0350 0.0371
16:01-17:00, Thu., 27 Mar. 0.0391 0.0351 0.0373
15:01-16:00, Thu., 27 Mar. 0.0396 0.0350 0.0370
14:01-15:00, Thu., 27 Mar. 0.0394 0.0350 0.0373
13:01-14:00, Thu., 27 Mar. 0.0396 0.0346 0.0372
12:01-13:00, Thu., 27 Mar. 0.0394 0.0349 0.0371
11:01-12:00, Thu., 27 Mar. 0.0391 0.0345 0.0369
10:01-11:00, Thu., 27 Mar. 0.0391 0.0342 0.0373
09:01-10:00, Thu., 27 Mar. 0.0390 0.0353 0.0371
08:01-09:00, Thu., 27 Mar. 0.0389 0.0345 0.0373
07:01-08:00, Thu., 27 Mar. 0.0393 0.0347 0.0371
06:01-07:00, Thu., 27 Mar. 0.0397 0.0346 0.0372
05:01-06:00, Thu., 27 Mar. 0.0389 0.0347 0.0372
04:01-05:00, Thu., 27 Mar. 0.0402 0.0350 0.0370
03:01-04:00, Thu., 27 Mar. 0.0398 0.0351 0.0370
02:01-03:00, Thu., 27 Mar. 0.0396 0.0343 0.0373
01:01-02:00, Thu., 27 Mar. 0.0394 0.0344 0.0372
00:01-01:00, Thu., 27 Mar. 0.0398 0.0340 0.0371
23:01-24:00, Wed., 26 Mar. 0.0393 0.0341 0.0371
22:01-23:00, Wed., 26 Mar. 0.0391 0.0343 0.0370
21:01-22:00, Wed., 26 Mar. 0.0398 0.0350 0.0371
20:01-21:00, Wed., 26 Mar. 0.0390 0.0355 0.0373
19:01-20:00, Wed., 26 Mar. 0.0386 0.0340 0.0370
18:01-19:00, Wed., 26 Mar. 0.0395 0.0350 0.0372
17:01-18:00, Wed., 26 Mar. 0.0393 0.0357 0.0373
16:01-17:00, Wed., 26 Mar. 0.0398 0.0353 0.0376
15:01-16:00, Wed., 26 Mar. 0.0398 0.0350 0.0375
14:01-15:00, Wed., 26 Mar. 0.0393 0.0358 0.0375
13:01-14:00, Wed., 26 Mar. 0.0409 0.0351 0.0376
12:01-13:00, Wed., 26 Mar. 0.0389 0.0355 0.0373
11:01-12:00, Wed., 26 Mar. 0.0394 0.0357 0.0377
10:01-11:00, Wed., 26 Mar. 0.0398 0.0350 0.0373
09:01-10:00, Wed., 26 Mar. 0.0391 0.0357 0.0373
08:01-09:00, Wed., 26 Mar. 0.0388 0.0357 0.0372
07:01-08:00, Wed., 26 Mar. 0.0392 0.0352 0.0372
06:01-07:00, Wed., 26 Mar. 0.0395 0.0350 0.0372
05:01-06:00, Wed., 26 Mar. 0.0393 0.0350 0.0371
04:01-05:00, Wed., 26 Mar. 0.0401 0.0345 0.0370
03:01-04:00, Wed., 26 Mar. 0.0393 0.0350 0.0372
02:01-03:00, Wed., 26 Mar. 0.0390 0.0346 0.0370
01:01-02:00, Wed., 26 Mar. 0.0399 0.0343 0.0368
00:01-01:00, Wed., 26 Mar. 0.0395 0.0347 0.0369
23:01-24:00, Tue., 25 Mar. 0.0397 0.0349 0.0372
22:01-23:00, Tue., 25 Mar. 0.0407 0.0358 0.0373
21:01-22:00, Tue., 25 Mar. 0.0395 0.0346 0.0372
20:01-21:00, Tue., 25 Mar. 0.0391 0.0349 0.0373
19:01-20:00, Tue., 25 Mar. 0.0392 0.0350 0.0372
18:01-19:00, Tue., 25 Mar. 0.0386 0.0353 0.0371
17:01-18:00, Tue., 25 Mar. 0.0391 0.0347 0.0371
16:01-17:00, Tue., 25 Mar. 0.0401 0.0350 0.0373
15:01-16:00, Tue., 25 Mar. 0.0389 0.0347 0.0370
14:01-15:00, Tue., 25 Mar. 0.0401 0.0344 0.0370
13:01-14:00, Tue., 25 Mar. 0.0388 0.0354 0.0371
12:01-13:00, Tue., 25 Mar. 0.0388 0.0352 0.0371
11:01-12:00, Tue., 25 Mar. 0.0392 0.0350 0.0370
10:01-11:00, Tue., 25 Mar. 0.0386 0.0349 0.0370
09:01-10:00, Tue., 25 Mar. 0.0391 0.0347 0.0370
08:01-09:00, Tue., 25 Mar. 0.0404 0.0347 0.0372
07:01-08:00, Tue., 25 Mar. 0.0391 0.0336 0.0371
06:01-07:00, Tue., 25 Mar. 0.0395 0.0347 0.0370
05:01-06:00, Tue., 25 Mar. 0.0394 0.0344 0.0369
04:01-05:00, Tue., 25 Mar. 0.0391 0.0350 0.0370
03:01-04:00, Tue., 25 Mar. 0.0395 0.0347 0.0372
02:01-03:00, Tue., 25 Mar. 0.0397 0.0345 0.0368
01:01-02:00, Tue., 25 Mar. 0.0391 0.0349 0.0371
00:01-01:00, Tue., 25 Mar. 0.0396 0.0347 0.0370
23:01-24:00, Mon., 24 Mar. 0.0394 0.0353 0.0372
22:01-23:00, Mon., 24 Mar. 0.0395 0.0352 0.0372
21:01-22:00, Mon., 24 Mar. 0.0391 0.0350 0.0370
20:01-21:00, Mon., 24 Mar. 0.0395 0.0348 0.0366
19:01-20:00, Mon., 24 Mar. 0.0387 0.0340 0.0368
18:01-19:00, Mon., 24 Mar. 0.0397 0.0345 0.0368
17:01-18:00, Mon., 24 Mar. 0.0390 0.0343 0.0368
16:01-17:00, Mon., 24 Mar. 0.0393 0.0349 0.0371
15:01-16:00, Mon., 24 Mar. 0.0390 0.0353 0.0368
14:01-15:00, Mon., 24 Mar. 0.0397 0.0343 0.0370
13:01-14:00, Mon., 24 Mar. 0.0391 0.0347 0.0370
12:01-13:00, Mon., 24 Mar. 0.0392 0.0350 0.0371
11:01-12:00, Mon., 24 Mar. 0.0393 0.0344 0.0367
10:01-11:00, Mon., 24 Mar. 0.0397 0.0356 0.0371
09:01-10:00, Mon., 24 Mar. 0.0403 0.0353 0.0372
08:01-09:00, Mon., 24 Mar. 0.0387 0.0351 0.0367
07:01-08:00, Mon., 24 Mar. 0.0388 0.0345 0.0370
06:01-07:00, Mon., 24 Mar. 0.0391 0.0343 0.0369
05:01-06:00, Mon., 24 Mar. 0.0391 0.0350 0.0370
04:01-05:00, Mon., 24 Mar. 0.0393 0.0343 0.0369
03:01-04:00, Mon., 24 Mar. 0.0394 0.0354 0.0371
02:01-03:00, Mon., 24 Mar. 0.0392 0.0349 0.0370
01:01-02:00, Mon., 24 Mar. 0.0394 0.0347 0.0370
00:01-01:00, Mon., 24 Mar. 0.0388 0.0348 0.0368
23:01-24:00, Sun., 23 Mar. 0.0396 0.0347 0.0369
22:01-23:00, Sun., 23 Mar. 0.0395 0.0345 0.0370
21:01-22:00, Sun., 23 Mar. 0.0391 0.0349 0.0369
20:01-21:00, Sun., 23 Mar. 0.0391 0.0347 0.0370
19:01-20:00, Sun., 23 Mar. 0.0393 0.0316 0.0370
18:01-19:00, Sun., 23 Mar. 0.0390 0.0348 0.0371
17:01-18:00, Sun., 23 Mar. 0.0391 0.0356 0.0374
16:01-17:00, Sun., 23 Mar. 0.0392 0.0344 0.0371
15:01-16:00, Sun., 23 Mar. 0.0395 0.0354 0.0374
14:01-15:00, Sun., 23 Mar. 0.0401 0.0338 0.0371
13:01-14:00, Sun., 23 Mar. 0.0394 0.0351 0.0374
12:01-13:00, Sun., 23 Mar. 0.0394 0.0352 0.0371
11:01-12:00, Sun., 23 Mar. 0.0399 0.0344 0.0371
10:01-11:00, Sun., 23 Mar. 0.0400 0.0354 0.0370
09:01-10:00, Sun., 23 Mar. 0.0398 0.0342 0.0371
08:01-09:00, Sun., 23 Mar. 0.0395 0.0350 0.0370
07:01-08:00, Sun., 23 Mar. 0.0392 0.0345 0.0371
06:01-07:00, Sun., 23 Mar. 0.0396 0.0336 0.0371
05:01-06:00, Sun., 23 Mar. 0.0401 0.0348 0.0371
04:01-05:00, Sun., 23 Mar. 0.0402 0.0352 0.0370
03:01-04:00, Sun., 23 Mar. 0.0397 0.0347 0.0370
02:01-03:00, Sun., 23 Mar. 0.0391 0.0348 0.0371
01:01-02:00, Sun., 23 Mar. 0.0395 0.0351 0.0370
00:01-01:00, Sun., 23 Mar. 0.0386 0.0349 0.0370
23:01-24:00, Sat., 22 Mar. 0.0392 0.0339 0.0372
22:01-23:00, Sat., 22 Mar. 0.0390 0.0343 0.0371
21:01-22:00, Sat., 22 Mar. 0.0396 0.0353 0.0370
20:01-21:00, Sat., 22 Mar. 0.0391 0.0353 0.0371
19:01-20:00, Sat., 22 Mar. 0.0408 0.0349 0.0373
18:01-19:00, Sat., 22 Mar. 0.0391 0.0353 0.0371
17:01-18:00, Sat., 22 Mar. 0.0391 0.0355 0.0371
16:01-17:00, Sat., 22 Mar. 0.0396 0.0351 0.0373
15:01-16:00, Sat., 22 Mar. 0.0393 0.0346 0.0370
14:01-15:00, Sat., 22 Mar. 0.0393 0.0350 0.0373
13:01-14:00, Sat., 22 Mar. 0.0395 0.0350 0.0372
12:01-13:00, Sat., 22 Mar. 0.0395 0.0348 0.0369
11:01-12:00, Sat., 22 Mar. 0.0395 0.0348 0.0370
10:01-11:00, Sat., 22 Mar. 0.0387 0.0347 0.0370
09:01-10:00, Sat., 22 Mar. 0.0408 0.0352 0.0372
08:01-09:00, Sat., 22 Mar. 0.0402 0.0350 0.0372
07:01-08:00, Sat., 22 Mar. 0.0394 0.0346 0.0371
06:01-07:00, Sat., 22 Mar. 0.0399 0.0353 0.0371
05:01-06:00, Sat., 22 Mar. 0.0391 0.0347 0.0371
04:01-05:00, Sat., 22 Mar. 0.0391 0.0355 0.0371
03:01-04:00, Sat., 22 Mar. 0.0396 0.0355 0.0371
02:01-03:00, Sat., 22 Mar. 0.0391 0.0349 0.0372
01:01-02:00, Sat., 22 Mar. 0.0387 0.0343 0.0370
00:01-01:00, Sat., 22 Mar. 0.0391 0.0349 0.0371
23:01-24:00, Fri., 21 Mar. 0.0393 0.0347 0.0370
22:01-23:00, Fri., 21 Mar. 0.0396 0.0347 0.0369
21:01-22:00, Fri., 21 Mar. 0.0405 0.0343 0.0370
20:01-21:00, Fri., 21 Mar. 0.0384 0.0347 0.0367
19:01-20:00, Fri., 21 Mar. 0.0390 0.0347 0.0367
18:01-19:00, Fri., 21 Mar. 0.0393 0.0347 0.0369
17:01-18:00, Fri., 21 Mar. 0.0391 0.0350 0.0370
16:01-17:00, Fri., 21 Mar. 0.0398 0.0354 0.0372
15:01-16:00, Fri., 21 Mar. 0.0391 0.0352 0.0370
14:01-15:00, Fri., 21 Mar. 0.0390 0.0344 0.0371
13:01-14:00, Fri., 21 Mar. 0.0395 0.0348 0.0368
12:01-13:00, Fri., 21 Mar. 0.0383 0.0347 0.0367
11:01-12:00, Fri., 21 Mar. 0.0389 0.0350 0.0369
10:01-11:00, Fri., 21 Mar. 0.0385 0.0354 0.0368
09:01-10:00, Fri., 21 Mar. 0.0388 0.0352 0.0370
08:01-09:00, Fri., 21 Mar. 0.0398 0.0351 0.0369
07:01-08:00, Fri., 21 Mar. 0.0388 0.0353 0.0370
06:01-07:00, Fri., 21 Mar. 0.0399 0.0346 0.0370
05:01-06:00, Fri., 21 Mar. 0.0402 0.0350 0.0370
04:01-05:00, Fri., 21 Mar. 0.0398 0.0343 0.0368
03:01-04:00, Fri., 21 Mar. 0.0388 0.0351 0.0370
02:01-03:00, Fri., 21 Mar. 0.0391 0.0344 0.0369
01:01-02:00, Fri., 21 Mar. 0.0386 0.0345 0.0366
00:01-01:00, Fri., 21 Mar. 0.0391 0.0343 0.0366
23:01-24:00, Thu., 20 Mar. 0.0390 0.0347 0.0366
22:01-23:00, Thu., 20 Mar. 0.0392 0.0345 0.0367
21:01-22:00, Thu., 20 Mar. 0.0383 0.0341 0.0366
20:01-21:00, Thu., 20 Mar. 0.0388 0.0339 0.0368
19:01-20:00, Thu., 20 Mar. 0.0386 0.0340 0.0367
18:01-19:00, Thu., 20 Mar. 0.0398 0.0347 0.0369
17:01-18:00, Thu., 20 Mar. 0.0388 0.0350 0.0369
16:01-17:00, Thu., 20 Mar. 0.0389 0.0350 0.0367
15:01-16:00, Thu., 20 Mar. 0.0388 0.0347 0.0367
14:01-15:00, Thu., 20 Mar. 0.0388 0.0345 0.0369
13:01-14:00, Thu., 20 Mar. 0.0393 0.0348 0.0368
12:01-13:00, Thu., 20 Mar. 0.0388 0.0347 0.0367
11:01-12:00, Thu., 20 Mar. 0.0384 0.0341 0.0367
10:01-11:00, Thu., 20 Mar. 0.0391 0.0347 0.0370
09:01-10:00, Thu., 20 Mar. 0.0397 0.0343 0.0367
08:01-09:00, Thu., 20 Mar. 0.0388 0.0337 0.0368
07:01-08:00, Thu., 20 Mar. 0.0395 0.0347 0.0367
06:01-07:00, Thu., 20 Mar. 0.0383 0.0345 0.0365
05:01-06:00, Thu., 20 Mar. 0.0388 0.0352 0.0370
04:01-05:00, Thu., 20 Mar. 0.0400 0.0350 0.0369
03:01-04:00, Thu., 20 Mar. 0.0381 0.0343 0.0367
02:01-03:00, Thu., 20 Mar. 0.0389 0.0347 0.0370
01:01-02:00, Thu., 20 Mar. 0.0389 0.0347 0.0368
00:01-01:00, Thu., 20 Mar. 0.0388 0.0346 0.0366
23:01-24:00, Wed., 19 Mar. 0.0388 0.0350 0.0366
22:01-23:00, Wed., 19 Mar. 0.0384 0.0348 0.0366