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
05:01-06:00, Fri., 21 Nov. 0.0395 0.0360 0.0377
04:01-05:00, Fri., 21 Nov. 0.0402 0.0354 0.0377
03:01-04:00, Fri., 21 Nov. 0.0398 0.0353 0.0376
02:01-03:00, Fri., 21 Nov. 0.0395 0.0353 0.0375
01:01-02:00, Fri., 21 Nov. 0.0401 0.0350 0.0374
00:01-01:00, Fri., 21 Nov. 0.0392 0.0351 0.0372
23:01-24:00, Thu., 20 Nov. 0.0388 0.0354 0.0372
22:01-23:00, Thu., 20 Nov. 0.0387 0.0350 0.0371
21:01-22:00, Thu., 20 Nov. 0.0391 0.0350 0.0368
20:01-21:00, Thu., 20 Nov. 0.0396 0.0347 0.0370
19:01-20:00, Thu., 20 Nov. 0.0392 0.0342 0.0372
18:01-19:00, Thu., 20 Nov. 0.0391 0.0348 0.0370
17:01-18:00, Thu., 20 Nov. 0.0402 0.0353 0.0372
16:01-17:00, Thu., 20 Nov. 0.0396 0.0349 0.0369
15:01-16:00, Thu., 20 Nov. 0.0388 0.0347 0.0370
14:01-15:00, Thu., 20 Nov. 0.0392 0.0350 0.0371
13:01-14:00, Thu., 20 Nov. 0.0401 0.0354 0.0371
12:01-13:00, Thu., 20 Nov. 0.0394 0.0350 0.0372
11:01-12:00, Thu., 20 Nov. 0.0392 0.0354 0.0375
10:01-11:00, Thu., 20 Nov. 0.0395 0.0347 0.0374
09:01-10:00, Thu., 20 Nov. 0.0390 0.0353 0.0372
08:01-09:00, Thu., 20 Nov. 0.0399 0.0348 0.0372
07:01-08:00, Thu., 20 Nov. 0.0392 0.0356 0.0375
06:01-07:00, Thu., 20 Nov. 0.0392 0.0354 0.0375
05:01-06:00, Thu., 20 Nov. 0.0402 0.0353 0.0376
04:01-05:00, Thu., 20 Nov. 0.0395 0.0360 0.0379
03:01-04:00, Thu., 20 Nov. 0.0394 0.0350 0.0374
02:01-03:00, Thu., 20 Nov. 0.0395 0.0350 0.0371
01:01-02:00, Thu., 20 Nov. 0.0391 0.0353 0.0372
00:01-01:00, Thu., 20 Nov. 0.0386 0.0344 0.0370
23:01-24:00, Wed., 19 Nov. 0.0394 0.0350 0.0370
22:01-23:00, Wed., 19 Nov. 0.0405 0.0351 0.0372
21:01-22:00, Wed., 19 Nov. 0.0399 0.0349 0.0370
20:01-21:00, Wed., 19 Nov. 0.0390 0.0346 0.0370
19:01-20:00, Wed., 19 Nov. 0.0385 0.0343 0.0368
18:01-19:00, Wed., 19 Nov. 0.0383 0.0344 0.0367
17:01-18:00, Wed., 19 Nov. 0.0394 0.0352 0.0369
16:01-17:00, Wed., 19 Nov. 0.0393 0.0346 0.0366
15:01-16:00, Wed., 19 Nov. 0.0387 0.0347 0.0370
14:01-15:00, Wed., 19 Nov. 0.0397 0.0346 0.0370
13:01-14:00, Wed., 19 Nov. 0.0388 0.0342 0.0369
12:01-13:00, Wed., 19 Nov. 0.0382 0.0345 0.0365
11:01-12:00, Wed., 19 Nov. 0.0394 0.0338 0.0372
10:01-11:00, Wed., 19 Nov. 0.0398 0.0350 0.0369
09:01-10:00, Wed., 19 Nov. 0.0395 0.0341 0.0370
08:01-09:00, Wed., 19 Nov. 0.0388 0.0351 0.0371
07:01-08:00, Wed., 19 Nov. 0.0388 0.0349 0.0371
06:01-07:00, Wed., 19 Nov. 0.0394 0.0354 0.0372
05:01-06:00, Wed., 19 Nov. 0.0393 0.0338 0.0372
04:01-05:00, Wed., 19 Nov. 0.0393 0.0350 0.0370
03:01-04:00, Wed., 19 Nov. 0.0388 0.0353 0.0371
02:01-03:00, Wed., 19 Nov. 0.0392 0.0350 0.0372
01:01-02:00, Wed., 19 Nov. 0.0395 0.0353 0.0373
00:01-01:00, Wed., 19 Nov. 0.0398 0.0348 0.0372
23:01-24:00, Tue., 18 Nov. 0.0396 0.0359 0.0373
22:01-23:00, Tue., 18 Nov. 0.0397 0.0350 0.0374
21:01-22:00, Tue., 18 Nov. 0.0395 0.0347 0.0373
20:01-21:00, Tue., 18 Nov. 0.0391 0.0349 0.0372
19:01-20:00, Tue., 18 Nov. 0.0397 0.0357 0.0375
18:01-19:00, Tue., 18 Nov. 0.0414 0.0362 0.0381
17:01-18:00, Tue., 18 Nov. 0.0411 0.0370 0.0390
16:01-17:00, Tue., 18 Nov. 0.0405 0.0350 0.0380
15:01-16:00, Tue., 18 Nov. 0.0394 0.0351 0.0375
14:01-15:00, Tue., 18 Nov. 0.0395 0.0353 0.0373
13:01-14:00, Tue., 18 Nov. 0.0398 0.0349 0.0373
12:01-13:00, Tue., 18 Nov. 0.0402 0.0354 0.0374
11:01-12:00, Tue., 18 Nov. 0.0401 0.0350 0.0374
10:01-11:00, Tue., 18 Nov. 0.0392 0.0347 0.0375
09:01-10:00, Tue., 18 Nov. 0.0390 0.0356 0.0375
08:01-09:00, Tue., 18 Nov. 0.0392 0.0347 0.0372
07:01-08:00, Tue., 18 Nov. 0.0398 0.0348 0.0372
06:01-07:00, Tue., 18 Nov. 0.0391 0.0347 0.0369
05:01-06:00, Tue., 18 Nov. 0.0388 0.0351 0.0371
04:01-05:00, Tue., 18 Nov. 0.0395 0.0345 0.0373
03:01-04:00, Tue., 18 Nov. 0.0390 0.0345 0.0370
02:01-03:00, Tue., 18 Nov. 0.0400 0.0345 0.0372
01:01-02:00, Tue., 18 Nov. 0.0396 0.0354 0.0373
00:01-01:00, Tue., 18 Nov. 0.0391 0.0341 0.0371
23:01-24:00, Mon., 17 Nov. 0.0394 0.0344 0.0369
22:01-23:00, Mon., 17 Nov. 0.0393 0.0341 0.0370
21:01-22:00, Mon., 17 Nov. 0.0396 0.0347 0.0370
20:01-21:00, Mon., 17 Nov. 0.0388 0.0345 0.0371
19:01-20:00, Mon., 17 Nov. 0.0390 0.0346 0.0368
18:01-19:00, Mon., 17 Nov. 0.0396 0.0346 0.0368
17:01-18:00, Mon., 17 Nov. 0.0391 0.0348 0.0368
16:01-17:00, Mon., 17 Nov. 0.0393 0.0348 0.0370
15:01-16:00, Mon., 17 Nov. 0.0391 0.0346 0.0369
14:01-15:00, Mon., 17 Nov. 0.0384 0.0342 0.0369
13:01-14:00, Mon., 17 Nov. 0.0391 0.0348 0.0369
12:01-13:00, Mon., 17 Nov. 0.0390 0.0346 0.0370
11:01-12:00, Mon., 17 Nov. 0.0387 0.0343 0.0368
10:01-11:00, Mon., 17 Nov. 0.0392 0.0345 0.0368
09:01-10:00, Mon., 17 Nov. 0.0390 0.0350 0.0369
08:01-09:00, Mon., 17 Nov. 0.0398 0.0354 0.0375
07:01-08:00, Mon., 17 Nov. 0.0395 0.0347 0.0376
06:01-07:00, Mon., 17 Nov. 0.0398 0.0349 0.0372
05:01-06:00, Mon., 17 Nov. 0.0393 0.0352 0.0372
04:01-05:00, Mon., 17 Nov. 0.0396 0.0350 0.0373
03:01-04:00, Mon., 17 Nov. 0.0394 0.0347 0.0370
02:01-03:00, Mon., 17 Nov. 0.0396 0.0348 0.0374
01:01-02:00, Mon., 17 Nov. 0.0393 0.0347 0.0374
00:01-01:00, Mon., 17 Nov. 0.0391 0.0351 0.0370
23:01-24:00, Sun., 16 Nov. 0.0388 0.0346 0.0367
22:01-23:00, Sun., 16 Nov. 0.0385 0.0343 0.0366
21:01-22:00, Sun., 16 Nov. 0.0393 0.0347 0.0368
20:01-21:00, Sun., 16 Nov. 0.0391 0.0350 0.0369
19:01-20:00, Sun., 16 Nov. 0.0388 0.0344 0.0368
18:01-19:00, Sun., 16 Nov. 0.0393 0.0350 0.0367
17:01-18:00, Sun., 16 Nov. 0.0412 0.0342 0.0370
16:01-17:00, Sun., 16 Nov. 0.0388 0.0348 0.0368
15:01-16:00, Sun., 16 Nov. 0.0389 0.0347 0.0369
14:01-15:00, Sun., 16 Nov. 0.0395 0.0349 0.0369
13:01-14:00, Sun., 16 Nov. 0.0399 0.0352 0.0371
12:01-13:00, Sun., 16 Nov. 0.0395 0.0355 0.0372
11:01-12:00, Sun., 16 Nov. 0.0398 0.0348 0.0372
10:01-11:00, Sun., 16 Nov. 0.0395 0.0343 0.0371
09:01-10:00, Sun., 16 Nov. 0.0396 0.0347 0.0372
08:01-09:00, Sun., 16 Nov. 0.0393 0.0351 0.0372
07:01-08:00, Sun., 16 Nov. 0.0395 0.0353 0.0372
06:01-07:00, Sun., 16 Nov. 0.0391 0.0348 0.0372
05:01-06:00, Sun., 16 Nov. 0.0390 0.0347 0.0371
04:01-05:00, Sun., 16 Nov. 0.0385 0.0346 0.0369
03:01-04:00, Sun., 16 Nov. 0.0398 0.0343 0.0369
02:01-03:00, Sun., 16 Nov. 0.0393 0.0342 0.0369
01:01-02:00, Sun., 16 Nov. 0.0386 0.0340 0.0367
00:01-01:00, Sun., 16 Nov. 0.0393 0.0352 0.0371
23:01-24:00, Sat., 15 Nov. 0.0390 0.0350 0.0368
22:01-23:00, Sat., 15 Nov. 0.0387 0.0347 0.0369
21:01-22:00, Sat., 15 Nov. 0.0389 0.0349 0.0368
20:01-21:00, Sat., 15 Nov. 0.0386 0.0351 0.0367
19:01-20:00, Sat., 15 Nov. 0.0392 0.0343 0.0365
18:01-19:00, Sat., 15 Nov. 0.0393 0.0350 0.0366
17:01-18:00, Sat., 15 Nov. 0.0385 0.0350 0.0366
16:01-17:00, Sat., 15 Nov. 0.0386 0.0350 0.0368
15:01-16:00, Sat., 15 Nov. 0.0387 0.0343 0.0366
14:01-15:00, Sat., 15 Nov. 0.0395 0.0351 0.0368
13:01-14:00, Sat., 15 Nov. 0.0389 0.0355 0.0369
12:01-13:00, Sat., 15 Nov. 0.0394 0.0348 0.0370
11:01-12:00, Sat., 15 Nov. 0.0392 0.0350 0.0371
10:01-11:00, Sat., 15 Nov. 0.0391 0.0346 0.0369
09:01-10:00, Sat., 15 Nov. 0.0394 0.0350 0.0369
08:01-09:00, Sat., 15 Nov. 0.0391 0.0349 0.0369
07:01-08:00, Sat., 15 Nov. 0.0403 0.0346 0.0370
06:01-07:00, Sat., 15 Nov. 0.0393 0.0349 0.0371
05:01-06:00, Sat., 15 Nov. 0.0391 0.0344 0.0368
04:01-05:00, Sat., 15 Nov. 0.0386 0.0349 0.0369
03:01-04:00, Sat., 15 Nov. 0.0395 0.0340 0.0369
02:01-03:00, Sat., 15 Nov. 0.0400 0.0348 0.0368
01:01-02:00, Sat., 15 Nov. 0.0394 0.0341 0.0369
00:01-01:00, Sat., 15 Nov. 0.0387 0.0347 0.0367
23:01-24:00, Fri., 14 Nov. 0.0388 0.0337 0.0367
22:01-23:00, Fri., 14 Nov. 0.0388 0.0348 0.0367
21:01-22:00, Fri., 14 Nov. 0.0387 0.0347 0.0367
20:01-21:00, Fri., 14 Nov. 0.0393 0.0339 0.0368
19:01-20:00, Fri., 14 Nov. 0.0398 0.0345 0.0368
18:01-19:00, Fri., 14 Nov. 0.0389 0.0347 0.0365
17:01-18:00, Fri., 14 Nov. 0.0388 0.0347 0.0366
16:01-17:00, Fri., 14 Nov. 0.0384 0.0350 0.0366
15:01-16:00, Fri., 14 Nov. 0.0385 0.0353 0.0367
14:01-15:00, Fri., 14 Nov. 0.0391 0.0344 0.0366
13:01-14:00, Fri., 14 Nov. 0.0396 0.0352 0.0369
12:01-13:00, Fri., 14 Nov. 0.0389 0.0348 0.0367
11:01-12:00, Fri., 14 Nov. 0.0397 0.0353 0.0369
10:01-11:00, Fri., 14 Nov. 0.0381 0.0347 0.0368
09:01-10:00, Fri., 14 Nov. 0.0391 0.0349 0.0370
08:01-09:00, Fri., 14 Nov. 0.0398 0.0342 0.0367
07:01-08:00, Fri., 14 Nov. 0.0394 0.0350 0.0370
06:01-07:00, Fri., 14 Nov. 0.0391 0.0349 0.0372
05:01-06:00, Fri., 14 Nov. 0.0391 0.0348 0.0374
04:01-05:00, Fri., 14 Nov. 0.0399 0.0353 0.0374
03:01-04:00, Fri., 14 Nov. 0.0396 0.0344 0.0373
02:01-03:00, Fri., 14 Nov. 0.0399 0.0355 0.0374
01:01-02:00, Fri., 14 Nov. 0.0395 0.0354 0.0373
00:01-01:00, Fri., 14 Nov. 0.0395 0.0340 0.0372
23:01-24:00, Thu., 13 Nov. 0.0401 0.0357 0.0373
22:01-23:00, Thu., 13 Nov. 0.0410 0.0342 0.0372
21:01-22:00, Thu., 13 Nov. 0.0396 0.0349 0.0371
20:01-21:00, Thu., 13 Nov. 0.0400 0.0345 0.0369
19:01-20:00, Thu., 13 Nov. 0.0388 0.0350 0.0372
18:01-19:00, Thu., 13 Nov. 0.0394 0.0352 0.0370
17:01-18:00, Thu., 13 Nov. 0.0395 0.0347 0.0373
16:01-17:00, Thu., 13 Nov. 0.0391 0.0347 0.0371
15:01-16:00, Thu., 13 Nov. 0.0393 0.0357 0.0371
14:01-15:00, Thu., 13 Nov. 0.0391 0.0341 0.0371
13:01-14:00, Thu., 13 Nov. 0.0388 0.0353 0.0370
12:01-13:00, Thu., 13 Nov. 0.0389 0.0347 0.0371
11:01-12:00, Thu., 13 Nov. 0.0407 0.0351 0.0376
10:01-11:00, Thu., 13 Nov. 0.0416 0.0356 0.0377
09:01-10:00, Thu., 13 Nov. 0.0396 0.0353 0.0372
08:01-09:00, Thu., 13 Nov. 0.0395 0.0352 0.0372
07:01-08:00, Thu., 13 Nov. 0.0399 0.0350 0.0372
06:01-07:00, Thu., 13 Nov. 0.0393 0.0355 0.0374
05:01-06:00, Thu., 13 Nov. 0.0388 0.0350 0.0371
04:01-05:00, Thu., 13 Nov. 0.0396 0.0343 0.0373
03:01-04:00, Thu., 13 Nov. 0.0394 0.0344 0.0372
02:01-03:00, Thu., 13 Nov. 0.0395 0.0354 0.0372
01:01-02:00, Thu., 13 Nov. 0.0395 0.0345 0.0371
00:01-01:00, Thu., 13 Nov. 0.0398 0.0350 0.0368
23:01-24:00, Wed., 12 Nov. 0.0398 0.0338 0.0367
22:01-23:00, Wed., 12 Nov. 0.0384 0.0341 0.0365
21:01-22:00, Wed., 12 Nov. 0.0382 0.0344 0.0365
20:01-21:00, Wed., 12 Nov. 0.0383 0.0345 0.0365
19:01-20:00, Wed., 12 Nov. 0.0383 0.0345 0.0366
18:01-19:00, Wed., 12 Nov. 0.0381 0.0347 0.0365
17:01-18:00, Wed., 12 Nov. 0.0390 0.0344 0.0366
16:01-17:00, Wed., 12 Nov. 0.0392 0.0348 0.0368
15:01-16:00, Wed., 12 Nov. 0.0387 0.0345 0.0365
14:01-15:00, Wed., 12 Nov. 0.0391 0.0343 0.0367
13:01-14:00, Wed., 12 Nov. 0.0385 0.0343 0.0365
12:01-13:00, Wed., 12 Nov. 0.0384 0.0342 0.0367
11:01-12:00, Wed., 12 Nov. 0.0398 0.0349 0.0367
10:01-11:00, Wed., 12 Nov. 0.0391 0.0350 0.0369
09:01-10:00, Wed., 12 Nov. 0.0385 0.0347 0.0368
08:01-09:00, Wed., 12 Nov. 0.0391 0.0350 0.0368
07:01-08:00, Wed., 12 Nov. 0.0387 0.0348 0.0371
06:01-07:00, Wed., 12 Nov. 0.0386 0.0350 0.0368
05:01-06:00, Wed., 12 Nov. 0.0388 0.0352 0.0369
04:01-05:00, Wed., 12 Nov. 0.0395 0.0345 0.0369
03:01-04:00, Wed., 12 Nov. 0.0388 0.0351 0.0368
02:01-03:00, Wed., 12 Nov. 0.0395 0.0349 0.0368
01:01-02:00, Wed., 12 Nov. 0.0388 0.0349 0.0367
00:01-01:00, Wed., 12 Nov. 0.0394 0.0346 0.0370
23:01-24:00, Tue., 11 Nov. 0.0391 0.0347 0.0368
22:01-23:00, Tue., 11 Nov. 0.0394 0.0333 0.0369
21:01-22:00, Tue., 11 Nov. 0.0391 0.0347 0.0369
20:01-21:00, Tue., 11 Nov. 0.0388 0.0345 0.0369
19:01-20:00, Tue., 11 Nov. 0.0392 0.0347 0.0369
18:01-19:00, Tue., 11 Nov. 0.0386 0.0344 0.0369
17:01-18:00, Tue., 11 Nov. 0.0381 0.0342 0.0364
16:01-17:00, Tue., 11 Nov. 0.0380 0.0339 0.0364
15:01-16:00, Tue., 11 Nov. 0.0387 0.0350 0.0368
14:01-15:00, Tue., 11 Nov. 0.0389 0.0352 0.0370
13:01-14:00, Tue., 11 Nov. 0.0391 0.0348 0.0369
12:01-13:00, Tue., 11 Nov. 0.0387 0.0343 0.0368
11:01-12:00, Tue., 11 Nov. 0.0395 0.0351 0.0368
10:01-11:00, Tue., 11 Nov. 0.0387 0.0340 0.0366
09:01-10:00, Tue., 11 Nov. 0.0397 0.0348 0.0371
08:01-09:00, Tue., 11 Nov. 0.0389 0.0348 0.0369
07:01-08:00, Tue., 11 Nov. 0.0395 0.0344 0.0370
06:01-07:00, Tue., 11 Nov. 0.0399 0.0347 0.0370