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
14:01-15:00, Wed., 21 Jan. 0.0391 0.0349 0.0373
13:01-14:00, Wed., 21 Jan. 0.0398 0.0350 0.0371
12:01-13:00, Wed., 21 Jan. 0.0395 0.0350 0.0375
11:01-12:00, Wed., 21 Jan. 0.0405 0.0357 0.0375
10:01-11:00, Wed., 21 Jan. 0.0388 0.0355 0.0374
09:01-10:00, Wed., 21 Jan. 0.0393 0.0354 0.0376
08:01-09:00, Wed., 21 Jan. 0.0400 0.0359 0.0375
07:01-08:00, Wed., 21 Jan. 0.0397 0.0357 0.0377
06:01-07:00, Wed., 21 Jan. 0.0401 0.0353 0.0376
05:01-06:00, Wed., 21 Jan. 0.0396 0.0351 0.0374
04:01-05:00, Wed., 21 Jan. 0.0398 0.0357 0.0378
03:01-04:00, Wed., 21 Jan. 0.0401 0.0353 0.0376
02:01-03:00, Wed., 21 Jan. 0.0405 0.0360 0.0378
01:01-02:00, Wed., 21 Jan. 0.0391 0.0359 0.0376
00:01-01:00, Wed., 21 Jan. 0.0398 0.0349 0.0375
23:01-24:00, Tue., 20 Jan. 0.0398 0.0351 0.0375
22:01-23:00, Tue., 20 Jan. 0.0396 0.0358 0.0376
21:01-22:00, Tue., 20 Jan. 0.0391 0.0353 0.0373
20:01-21:00, Tue., 20 Jan. 0.0394 0.0351 0.0374
19:01-20:00, Tue., 20 Jan. 0.0402 0.0357 0.0378
18:01-19:00, Tue., 20 Jan. 0.0394 0.0357 0.0375
17:01-18:00, Tue., 20 Jan. 0.0393 0.0341 0.0373
16:01-17:00, Tue., 20 Jan. 0.0392 0.0351 0.0375
15:01-16:00, Tue., 20 Jan. 0.0402 0.0354 0.0375
14:01-15:00, Tue., 20 Jan. 0.0398 0.0358 0.0375
13:01-14:00, Tue., 20 Jan. 0.0390 0.0355 0.0374
12:01-13:00, Tue., 20 Jan. 0.0403 0.0350 0.0375
11:01-12:00, Tue., 20 Jan. 0.0402 0.0357 0.0377
10:01-11:00, Tue., 20 Jan. 0.0405 0.0343 0.0378
09:01-10:00, Tue., 20 Jan. 0.0406 0.0347 0.0376
08:01-09:00, Tue., 20 Jan. 0.0400 0.0358 0.0378
07:01-08:00, Tue., 20 Jan. 0.0397 0.0364 0.0379
06:01-07:00, Tue., 20 Jan. 0.0395 0.0360 0.0376
05:01-06:00, Tue., 20 Jan. 0.0399 0.0349 0.0379
04:01-05:00, Tue., 20 Jan. 0.0398 0.0349 0.0376
03:01-04:00, Tue., 20 Jan. 0.0398 0.0354 0.0378
02:01-03:00, Tue., 20 Jan. 0.0404 0.0348 0.0375
01:01-02:00, Tue., 20 Jan. 0.0398 0.0358 0.0377
00:01-01:00, Tue., 20 Jan. 0.0395 0.0352 0.0374
23:01-24:00, Mon., 19 Jan. 0.0393 0.0349 0.0375
22:01-23:00, Mon., 19 Jan. 0.0399 0.0347 0.0374
21:01-22:00, Mon., 19 Jan. 0.0391 0.0352 0.0374
20:01-21:00, Mon., 19 Jan. 0.0391 0.0355 0.0373
19:01-20:00, Mon., 19 Jan. 0.0398 0.0351 0.0372
18:01-19:00, Mon., 19 Jan. 0.0397 0.0343 0.0374
17:01-18:00, Mon., 19 Jan. 0.0390 0.0349 0.0372
16:01-17:00, Mon., 19 Jan. 0.0395 0.0352 0.0371
15:01-16:00, Mon., 19 Jan. 0.0402 0.0354 0.0373
14:01-15:00, Mon., 19 Jan. 0.0387 0.0353 0.0372
13:01-14:00, Mon., 19 Jan. 0.0393 0.0349 0.0373
12:01-13:00, Mon., 19 Jan. 0.0396 0.0347 0.0373
11:01-12:00, Mon., 19 Jan. 0.0400 0.0351 0.0372
10:01-11:00, Mon., 19 Jan. 0.0405 0.0353 0.0374
09:01-10:00, Mon., 19 Jan. 0.0395 0.0359 0.0373
08:01-09:00, Mon., 19 Jan. 0.0395 0.0354 0.0373
07:01-08:00, Mon., 19 Jan. 0.0398 0.0353 0.0374
06:01-07:00, Mon., 19 Jan. 0.0395 0.0347 0.0373
05:01-06:00, Mon., 19 Jan. 0.0390 0.0351 0.0370
04:01-05:00, Mon., 19 Jan. 0.0395 0.0353 0.0373
03:01-04:00, Mon., 19 Jan. 0.0402 0.0350 0.0375
02:01-03:00, Mon., 19 Jan. 0.0399 0.0347 0.0375
01:01-02:00, Mon., 19 Jan. 0.0398 0.0349 0.0373
00:01-01:00, Mon., 19 Jan. 0.0391 0.0347 0.0371
23:01-24:00, Sun., 18 Jan. 0.0391 0.0339 0.0373
22:01-23:00, Sun., 18 Jan. 0.0392 0.0354 0.0374
21:01-22:00, Sun., 18 Jan. 0.0392 0.0350 0.0373
20:01-21:00, Sun., 18 Jan. 0.0399 0.0344 0.0374
19:01-20:00, Sun., 18 Jan. 0.0393 0.0353 0.0372
18:01-19:00, Sun., 18 Jan. 0.0397 0.0353 0.0374
17:01-18:00, Sun., 18 Jan. 0.0400 0.0350 0.0374
16:01-17:00, Sun., 18 Jan. 0.0399 0.0342 0.0374
15:01-16:00, Sun., 18 Jan. 0.0393 0.0352 0.0374
14:01-15:00, Sun., 18 Jan. 0.0399 0.0351 0.0373
13:01-14:00, Sun., 18 Jan. 0.0395 0.0355 0.0373
12:01-13:00, Sun., 18 Jan. 0.0400 0.0348 0.0375
11:01-12:00, Sun., 18 Jan. 0.0398 0.0357 0.0375
10:01-11:00, Sun., 18 Jan. 0.0394 0.0350 0.0372
09:01-10:00, Sun., 18 Jan. 0.0398 0.0346 0.0374
08:01-09:00, Sun., 18 Jan. 0.0388 0.0355 0.0375
07:01-08:00, Sun., 18 Jan. 0.0394 0.0351 0.0374
06:01-07:00, Sun., 18 Jan. 0.0400 0.0347 0.0374
05:01-06:00, Sun., 18 Jan. 0.0400 0.0351 0.0374
04:01-05:00, Sun., 18 Jan. 0.0398 0.0349 0.0376
03:01-04:00, Sun., 18 Jan. 0.0395 0.0353 0.0376
02:01-03:00, Sun., 18 Jan. 0.0395 0.0357 0.0376
01:01-02:00, Sun., 18 Jan. 0.0402 0.0355 0.0377
00:01-01:00, Sun., 18 Jan. 0.0389 0.0354 0.0374
23:01-24:00, Sat., 17 Jan. 0.0402 0.0340 0.0375
22:01-23:00, Sat., 17 Jan. 0.0402 0.0351 0.0374
21:01-22:00, Sat., 17 Jan. 0.0391 0.0351 0.0375
20:01-21:00, Sat., 17 Jan. 0.0398 0.0355 0.0373
19:01-20:00, Sat., 17 Jan. 0.0398 0.0349 0.0374
18:01-19:00, Sat., 17 Jan. 0.0391 0.0357 0.0373
17:01-18:00, Sat., 17 Jan. 0.0398 0.0350 0.0375
16:01-17:00, Sat., 17 Jan. 0.0398 0.0360 0.0375
15:01-16:00, Sat., 17 Jan. 0.0398 0.0350 0.0374
14:01-15:00, Sat., 17 Jan. 0.0403 0.0350 0.0375
13:01-14:00, Sat., 17 Jan. 0.0398 0.0360 0.0376
12:01-13:00, Sat., 17 Jan. 0.0401 0.0355 0.0377
11:01-12:00, Sat., 17 Jan. 0.0402 0.0351 0.0375
10:01-11:00, Sat., 17 Jan. 0.0396 0.0357 0.0377
09:01-10:00, Sat., 17 Jan. 0.0405 0.0347 0.0378
08:01-09:00, Sat., 17 Jan. 0.0400 0.0357 0.0378
07:01-08:00, Sat., 17 Jan. 0.0406 0.0353 0.0377
06:01-07:00, Sat., 17 Jan. 0.0398 0.0350 0.0375
05:01-06:00, Sat., 17 Jan. 0.0395 0.0352 0.0371
04:01-05:00, Sat., 17 Jan. 0.0395 0.0354 0.0373
03:01-04:00, Sat., 17 Jan. 0.0390 0.0356 0.0372
02:01-03:00, Sat., 17 Jan. 0.0398 0.0350 0.0375
01:01-02:00, Sat., 17 Jan. 0.0394 0.0354 0.0370
00:01-01:00, Sat., 17 Jan. 0.0398 0.0355 0.0372
23:01-24:00, Fri., 16 Jan. 0.0389 0.0353 0.0371
22:01-23:00, Fri., 16 Jan. 0.0397 0.0346 0.0373
21:01-22:00, Fri., 16 Jan. 0.0395 0.0353 0.0371
20:01-21:00, Fri., 16 Jan. 0.0392 0.0348 0.0370
19:01-20:00, Fri., 16 Jan. 0.0391 0.0350 0.0370
18:01-19:00, Fri., 16 Jan. 0.0396 0.0353 0.0373
17:01-18:00, Fri., 16 Jan. 0.0394 0.0355 0.0372
16:01-17:00, Fri., 16 Jan. 0.0398 0.0353 0.0373
15:01-16:00, Fri., 16 Jan. 0.0400 0.0352 0.0374
14:01-15:00, Fri., 16 Jan. 0.0398 0.0350 0.0373
13:01-14:00, Fri., 16 Jan. 0.0409 0.0346 0.0375
12:01-13:00, Fri., 16 Jan. 0.0395 0.0357 0.0376
11:01-12:00, Fri., 16 Jan. 0.0402 0.0351 0.0376
10:01-11:00, Fri., 16 Jan. 0.0398 0.0348 0.0373
09:01-10:00, Fri., 16 Jan. 0.0402 0.0353 0.0373
08:01-09:00, Fri., 16 Jan. 0.0399 0.0353 0.0376
07:01-08:00, Fri., 16 Jan. 0.0393 0.0350 0.0377
06:01-07:00, Fri., 16 Jan. 0.0403 0.0353 0.0375
05:01-06:00, Fri., 16 Jan. 0.0392 0.0356 0.0375
04:01-05:00, Fri., 16 Jan. 0.0396 0.0350 0.0374
03:01-04:00, Fri., 16 Jan. 0.0406 0.0347 0.0375
02:01-03:00, Fri., 16 Jan. 0.0398 0.0353 0.0376
01:01-02:00, Fri., 16 Jan. 0.0391 0.0357 0.0373
00:01-01:00, Fri., 16 Jan. 0.0400 0.0356 0.0376
23:01-24:00, Thu., 15 Jan. 0.0403 0.0354 0.0375
22:01-23:00, Thu., 15 Jan. 0.0405 0.0351 0.0378
21:01-22:00, Thu., 15 Jan. 0.0402 0.0357 0.0377
20:01-21:00, Thu., 15 Jan. 0.0405 0.0353 0.0374
19:01-20:00, Thu., 15 Jan. 0.0395 0.0347 0.0373
18:01-19:00, Thu., 15 Jan. 0.0394 0.0353 0.0374
17:01-18:00, Thu., 15 Jan. 0.0402 0.0347 0.0372
16:01-17:00, Thu., 15 Jan. 0.0386 0.0340 0.0369
15:01-16:00, Thu., 15 Jan. 0.0403 0.0344 0.0370
14:01-15:00, Thu., 15 Jan. 0.0386 0.0349 0.0369
13:01-14:00, Thu., 15 Jan. 0.0402 0.0351 0.0371
12:01-13:00, Thu., 15 Jan. 0.0389 0.0349 0.0372
11:01-12:00, Thu., 15 Jan. 0.0394 0.0345 0.0373
10:01-11:00, Thu., 15 Jan. 0.0389 0.0350 0.0371
09:01-10:00, Thu., 15 Jan. 0.0402 0.0351 0.0373
08:01-09:00, Thu., 15 Jan. 0.0395 0.0349 0.0372
07:01-08:00, Thu., 15 Jan. 0.0395 0.0352 0.0372
06:01-07:00, Thu., 15 Jan. 0.0403 0.0348 0.0374
05:01-06:00, Thu., 15 Jan. 0.0394 0.0345 0.0372
04:01-05:00, Thu., 15 Jan. 0.0396 0.0353 0.0373
03:01-04:00, Thu., 15 Jan. 0.0391 0.0347 0.0374
02:01-03:00, Thu., 15 Jan. 0.0395 0.0357 0.0373
01:01-02:00, Thu., 15 Jan. 0.0404 0.0353 0.0372
00:01-01:00, Thu., 15 Jan. 0.0388 0.0350 0.0370
23:01-24:00, Wed., 14 Jan. 0.0397 0.0346 0.0373
22:01-23:00, Wed., 14 Jan. 0.0407 0.0352 0.0373
21:01-22:00, Wed., 14 Jan. 0.0395 0.0356 0.0373
20:01-21:00, Wed., 14 Jan. 0.0402 0.0356 0.0372
19:01-20:00, Wed., 14 Jan. 0.0391 0.0353 0.0369
18:01-19:00, Wed., 14 Jan. 0.0387 0.0347 0.0371
17:01-18:00, Wed., 14 Jan. 0.0399 0.0347 0.0370
16:01-17:00, Wed., 14 Jan. 0.0410 0.0348 0.0371
15:01-16:00, Wed., 14 Jan. 0.0391 0.0348 0.0370
14:01-15:00, Wed., 14 Jan. 0.0391 0.0351 0.0371
13:01-14:00, Wed., 14 Jan. 0.0397 0.0351 0.0372
12:01-13:00, Wed., 14 Jan. 0.0391 0.0354 0.0370
11:01-12:00, Wed., 14 Jan. 0.0395 0.0351 0.0370
10:01-11:00, Wed., 14 Jan. 0.0391 0.0347 0.0372
09:01-10:00, Wed., 14 Jan. 0.0391 0.0347 0.0371
08:01-09:00, Wed., 14 Jan. 0.0395 0.0355 0.0374
07:01-08:00, Wed., 14 Jan. 0.0394 0.0345 0.0373
06:01-07:00, Wed., 14 Jan. 0.0398 0.0355 0.0373
05:01-06:00, Wed., 14 Jan. 0.0395 0.0349 0.0373
04:01-05:00, Wed., 14 Jan. 0.0397 0.0350 0.0374
03:01-04:00, Wed., 14 Jan. 0.0390 0.0348 0.0370
02:01-03:00, Wed., 14 Jan. 0.0395 0.0343 0.0373
01:01-02:00, Wed., 14 Jan. 0.0393 0.0354 0.0373
00:01-01:00, Wed., 14 Jan. 0.0397 0.0351 0.0372
23:01-24:00, Tue., 13 Jan. 0.0391 0.0347 0.0372
22:01-23:00, Tue., 13 Jan. 0.0384 0.0350 0.0371
21:01-22:00, Tue., 13 Jan. 0.0395 0.0359 0.0373
20:01-21:00, Tue., 13 Jan. 0.0390 0.0353 0.0372
19:01-20:00, Tue., 13 Jan. 0.0386 0.0357 0.0373
18:01-19:00, Tue., 13 Jan. 0.0399 0.0353 0.0375
17:01-18:00, Tue., 13 Jan. 0.0395 0.0359 0.0376
16:01-17:00, Tue., 13 Jan. 0.0405 0.0356 0.0375
15:01-16:00, Tue., 13 Jan. 0.0398 0.0351 0.0375
14:01-15:00, Tue., 13 Jan. 0.0401 0.0356 0.0376
13:01-14:00, Tue., 13 Jan. 0.0393 0.0353 0.0375
12:01-13:00, Tue., 13 Jan. 0.0395 0.0355 0.0376
11:01-12:00, Tue., 13 Jan. 0.0394 0.0352 0.0374
10:01-11:00, Tue., 13 Jan. 0.0402 0.0345 0.0373
09:01-10:00, Tue., 13 Jan. 0.0391 0.0350 0.0372
08:01-09:00, Tue., 13 Jan. 0.0398 0.0354 0.0373
07:01-08:00, Tue., 13 Jan. 0.0395 0.0356 0.0375
06:01-07:00, Tue., 13 Jan. 0.0402 0.0351 0.0375
05:01-06:00, Tue., 13 Jan. 0.0392 0.0352 0.0373
04:01-05:00, Tue., 13 Jan. 0.0401 0.0354 0.0376
03:01-04:00, Tue., 13 Jan. 0.0397 0.0357 0.0374
02:01-03:00, Tue., 13 Jan. 0.0392 0.0346 0.0372
01:01-02:00, Tue., 13 Jan. 0.0397 0.0358 0.0375
00:01-01:00, Tue., 13 Jan. 0.0398 0.0357 0.0373
23:01-24:00, Mon., 12 Jan. 0.0388 0.0351 0.0374
22:01-23:00, Mon., 12 Jan. 0.0397 0.0347 0.0370
21:01-22:00, Mon., 12 Jan. 0.0395 0.0355 0.0372
20:01-21:00, Mon., 12 Jan. 0.0383 0.0352 0.0371
19:01-20:00, Mon., 12 Jan. 0.0391 0.0353 0.0372
18:01-19:00, Mon., 12 Jan. 0.0398 0.0350 0.0375
17:01-18:00, Mon., 12 Jan. 0.0395 0.0348 0.0373
16:01-17:00, Mon., 12 Jan. 0.0399 0.0343 0.0371
15:01-16:00, Mon., 12 Jan. 0.0393 0.0355 0.0373
14:01-15:00, Mon., 12 Jan. 0.0395 0.0347 0.0374
13:01-14:00, Mon., 12 Jan. 0.0398 0.0353 0.0373
12:01-13:00, Mon., 12 Jan. 0.0399 0.0349 0.0371
11:01-12:00, Mon., 12 Jan. 0.0395 0.0353 0.0373
10:01-11:00, Mon., 12 Jan. 0.0391 0.0354 0.0372
09:01-10:00, Mon., 12 Jan. 0.0405 0.0351 0.0374
08:01-09:00, Mon., 12 Jan. 0.0394 0.0351 0.0374
07:01-08:00, Mon., 12 Jan. 0.0398 0.0351 0.0373
06:01-07:00, Mon., 12 Jan. 0.0400 0.0352 0.0377
05:01-06:00, Mon., 12 Jan. 0.0387 0.0336 0.0370
04:01-05:00, Mon., 12 Jan. 0.0397 0.0356 0.0373
03:01-04:00, Mon., 12 Jan. 0.0397 0.0350 0.0372
02:01-03:00, Mon., 12 Jan. 0.0401 0.0358 0.0375
01:01-02:00, Mon., 12 Jan. 0.0402 0.0357 0.0375
00:01-01:00, Mon., 12 Jan. 0.0399 0.0347 0.0374
23:01-24:00, Sun., 11 Jan. 0.0389 0.0350 0.0372
22:01-23:00, Sun., 11 Jan. 0.0393 0.0355 0.0375
21:01-22:00, Sun., 11 Jan. 0.0398 0.0349 0.0374
20:01-21:00, Sun., 11 Jan. 0.0392 0.0350 0.0374
19:01-20:00, Sun., 11 Jan. 0.0391 0.0357 0.0375
18:01-19:00, Sun., 11 Jan. 0.0395 0.0352 0.0373
17:01-18:00, Sun., 11 Jan. 0.0391 0.0357 0.0374
16:01-17:00, Sun., 11 Jan. 0.0393 0.0350 0.0373
15:01-16:00, Sun., 11 Jan. 0.0399 0.0359 0.0373