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
22:01-23:00, Sat., 20 Apr. 0.0394 0.0353 0.0372
21:01-22:00, Sat., 20 Apr. 0.0393 0.0349 0.0374
20:01-21:00, Sat., 20 Apr. 0.0394 0.0357 0.0373
19:01-20:00, Sat., 20 Apr. 0.0404 0.0351 0.0373
18:01-19:00, Sat., 20 Apr. 0.0391 0.0352 0.0374
17:01-18:00, Sat., 20 Apr. 0.0401 0.0350 0.0374
16:01-17:00, Sat., 20 Apr. 0.0399 0.0360 0.0377
15:01-16:00, Sat., 20 Apr. 0.0408 0.0357 0.0375
14:01-15:00, Sat., 20 Apr. 0.0397 0.0347 0.0376
13:01-14:00, Sat., 20 Apr. 0.0402 0.0351 0.0376
12:01-13:00, Sat., 20 Apr. 0.0397 0.0353 0.0375
11:01-12:00, Sat., 20 Apr. 0.0391 0.0357 0.0375
10:01-11:00, Sat., 20 Apr. 0.0396 0.0352 0.0375
09:01-10:00, Sat., 20 Apr. 0.0400 0.0353 0.0376
08:01-09:00, Sat., 20 Apr. 0.0396 0.0347 0.0374
07:01-08:00, Sat., 20 Apr. 0.0395 0.0354 0.0374
06:01-07:00, Sat., 20 Apr. 0.0393 0.0352 0.0375
05:01-06:00, Sat., 20 Apr. 0.0399 0.0353 0.0376
04:01-05:00, Sat., 20 Apr. 0.0399 0.0350 0.0374
03:01-04:00, Sat., 20 Apr. 0.0397 0.0355 0.0372
02:01-03:00, Sat., 20 Apr. 0.0391 0.0350 0.0374
01:01-02:00, Sat., 20 Apr. 0.0400 0.0336 0.0372
00:01-01:00, Sat., 20 Apr. 0.0402 0.0346 0.0373
23:01-24:00, Fri., 19 Apr. 0.0405 0.0353 0.0373
22:01-23:00, Fri., 19 Apr. 0.0393 0.0351 0.0371
21:01-22:00, Fri., 19 Apr. 0.0399 0.0357 0.0377
20:01-21:00, Fri., 19 Apr. 0.0390 0.0345 0.0374
19:01-20:00, Fri., 19 Apr. 0.0392 0.0351 0.0373
18:01-19:00, Fri., 19 Apr. 0.0396 0.0350 0.0372
17:01-18:00, Fri., 19 Apr. 0.0395 0.0353 0.0373
16:01-17:00, Fri., 19 Apr. 0.0398 0.0350 0.0376
15:01-16:00, Fri., 19 Apr. 0.0395 0.0352 0.0373
14:01-15:00, Fri., 19 Apr. 0.0393 0.0356 0.0376
13:01-14:00, Fri., 19 Apr. 0.0391 0.0350 0.0373
12:01-13:00, Fri., 19 Apr. 0.0398 0.0355 0.0376
11:01-12:00, Fri., 19 Apr. 0.0401 0.0351 0.0370
10:01-11:00, Fri., 19 Apr. 0.0391 0.0353 0.0373
09:01-10:00, Fri., 19 Apr. 0.0396 0.0353 0.0374
08:01-09:00, Fri., 19 Apr. 0.0395 0.0354 0.0373
07:01-08:00, Fri., 19 Apr. 0.0420 0.0353 0.0375
06:01-07:00, Fri., 19 Apr. 0.0393 0.0349 0.0373
05:01-06:00, Fri., 19 Apr. 0.0399 0.0347 0.0376
04:01-05:00, Fri., 19 Apr. 0.0395 0.0357 0.0375
03:01-04:00, Fri., 19 Apr. 0.0395 0.0355 0.0376
02:01-03:00, Fri., 19 Apr. 0.0398 0.0355 0.0373
01:01-02:00, Fri., 19 Apr. 0.0396 0.0350 0.0373
00:01-01:00, Fri., 19 Apr. 0.0402 0.0359 0.0378
23:01-24:00, Thu., 18 Apr. 0.0411 0.0355 0.0385
22:01-23:00, Thu., 18 Apr. 0.0421 0.0375 0.0397
21:01-22:00, Thu., 18 Apr. 0.0416 0.0364 0.0389
20:01-21:00, Thu., 18 Apr. 0.0425 0.0378 0.0398
19:01-20:00, Thu., 18 Apr. 0.0418 0.0373 0.0397
18:01-19:00, Thu., 18 Apr. 0.0423 0.0358 0.0384
17:01-18:00, Thu., 18 Apr. 0.0399 0.0357 0.0374
16:01-17:00, Thu., 18 Apr. 0.0393 0.0346 0.0371
15:01-16:00, Thu., 18 Apr. 0.0400 0.0353 0.0374
14:01-15:00, Thu., 18 Apr. 0.0395 0.0342 0.0374
13:01-14:00, Thu., 18 Apr. 0.0400 0.0353 0.0375
12:01-13:00, Thu., 18 Apr. 0.0395 0.0352 0.0373
11:01-12:00, Thu., 18 Apr. 0.0404 0.0352 0.0374
10:01-11:00, Thu., 18 Apr. 0.0397 0.0349 0.0372
09:01-10:00, Thu., 18 Apr. 0.0396 0.0343 0.0372
08:01-09:00, Thu., 18 Apr. 0.0393 0.0350 0.0372
07:01-08:00, Thu., 18 Apr. 0.0397 0.0356 0.0375
06:01-07:00, Thu., 18 Apr. 0.0395 0.0353 0.0375
05:01-06:00, Thu., 18 Apr. 0.0389 0.0352 0.0371
04:01-05:00, Thu., 18 Apr. 0.0400 0.0354 0.0373
03:01-04:00, Thu., 18 Apr. 0.0391 0.0356 0.0372
02:01-03:00, Thu., 18 Apr. 0.0395 0.0352 0.0371
01:01-02:00, Thu., 18 Apr. 0.0398 0.0350 0.0372
00:01-01:00, Thu., 18 Apr. 0.0390 0.0347 0.0370
23:01-24:00, Wed., 17 Apr. 0.0389 0.0348 0.0370
22:01-23:00, Wed., 17 Apr. 0.0392 0.0342 0.0371
21:01-22:00, Wed., 17 Apr. 0.0387 0.0350 0.0370
20:01-21:00, Wed., 17 Apr. 0.0389 0.0347 0.0368
19:01-20:00, Wed., 17 Apr. 0.0398 0.0343 0.0371
18:01-19:00, Wed., 17 Apr. 0.0400 0.0345 0.0373
17:01-18:00, Wed., 17 Apr. 0.0390 0.0356 0.0373
16:01-17:00, Wed., 17 Apr. 0.0395 0.0351 0.0372
15:01-16:00, Wed., 17 Apr. 0.0400 0.0347 0.0373
14:01-15:00, Wed., 17 Apr. 0.0395 0.0350 0.0371
13:01-14:00, Wed., 17 Apr. 0.0390 0.0353 0.0371
12:01-13:00, Wed., 17 Apr. 0.0385 0.0340 0.0368
11:01-12:00, Wed., 17 Apr. 0.0395 0.0349 0.0370
10:01-11:00, Wed., 17 Apr. 0.0391 0.0350 0.0369
09:01-10:00, Wed., 17 Apr. 0.0386 0.0343 0.0368
08:01-09:00, Wed., 17 Apr. 0.0390 0.0357 0.0372
07:01-08:00, Wed., 17 Apr. 0.0398 0.0356 0.0374
06:01-07:00, Wed., 17 Apr. 0.0398 0.0354 0.0373
05:01-06:00, Wed., 17 Apr. 0.0388 0.0349 0.0370
04:01-05:00, Wed., 17 Apr. 0.0397 0.0348 0.0371
03:01-04:00, Wed., 17 Apr. 0.0383 0.0353 0.0369
02:01-03:00, Wed., 17 Apr. 0.0384 0.0347 0.0369
01:01-02:00, Wed., 17 Apr. 0.0391 0.0345 0.0369
00:01-01:00, Wed., 17 Apr. 0.0390 0.0349 0.0370
23:01-24:00, Tue., 16 Apr. 0.0384 0.0343 0.0366
22:01-23:00, Tue., 16 Apr. 0.0385 0.0354 0.0369
21:01-22:00, Tue., 16 Apr. 0.0396 0.0340 0.0368
20:01-21:00, Tue., 16 Apr. 0.0386 0.0337 0.0369
19:01-20:00, Tue., 16 Apr. 0.0405 0.0350 0.0371
18:01-19:00, Tue., 16 Apr. 0.0386 0.0334 0.0367
17:01-18:00, Tue., 16 Apr. 0.0386 0.0349 0.0367
16:01-17:00, Tue., 16 Apr. 0.0388 0.0340 0.0369
15:01-16:00, Tue., 16 Apr. 0.0387 0.0345 0.0366
14:01-15:00, Tue., 16 Apr. 0.0384 0.0342 0.0366
13:01-14:00, Tue., 16 Apr. 0.0387 0.0343 0.0366
12:01-13:00, Tue., 16 Apr. 0.0384 0.0349 0.0369
11:01-12:00, Tue., 16 Apr. 0.0383 0.0342 0.0368
10:01-11:00, Tue., 16 Apr. 0.0399 0.0344 0.0366
09:01-10:00, Tue., 16 Apr. 0.0384 0.0347 0.0365
08:01-09:00, Tue., 16 Apr. 0.0400 0.0347 0.0368
07:01-08:00, Tue., 16 Apr. 0.0388 0.0342 0.0367
06:01-07:00, Tue., 16 Apr. 0.0394 0.0345 0.0368
05:01-06:00, Tue., 16 Apr. 0.0388 0.0338 0.0367
04:01-05:00, Tue., 16 Apr. 0.0388 0.0345 0.0366
03:01-04:00, Tue., 16 Apr. 0.0386 0.0346 0.0367
02:01-03:00, Tue., 16 Apr. 0.0395 0.0350 0.0368
01:01-02:00, Tue., 16 Apr. 0.0395 0.0353 0.0370
00:01-01:00, Tue., 16 Apr. 0.0390 0.0348 0.0367
23:01-24:00, Mon., 15 Apr. 0.0393 0.0347 0.0367
22:01-23:00, Mon., 15 Apr. 0.0390 0.0345 0.0366
21:01-22:00, Mon., 15 Apr. 0.0397 0.0343 0.0368
20:01-21:00, Mon., 15 Apr. 0.0386 0.0340 0.0365
19:01-20:00, Mon., 15 Apr. 0.0387 0.0349 0.0367
18:01-19:00, Mon., 15 Apr. 0.0386 0.0346 0.0367
17:01-18:00, Mon., 15 Apr. 0.0388 0.0349 0.0369
16:01-17:00, Mon., 15 Apr. 0.0390 0.0350 0.0371
15:01-16:00, Mon., 15 Apr. 0.0387 0.0347 0.0371
14:01-15:00, Mon., 15 Apr. 0.0392 0.0343 0.0370
13:01-14:00, Mon., 15 Apr. 0.0390 0.0347 0.0368
12:01-13:00, Mon., 15 Apr. 0.0398 0.0348 0.0368
11:01-12:00, Mon., 15 Apr. 0.0398 0.0347 0.0369
10:01-11:00, Mon., 15 Apr. 0.0390 0.0339 0.0368
09:01-10:00, Mon., 15 Apr. 0.0384 0.0340 0.0364
08:01-09:00, Mon., 15 Apr. 0.0384 0.0348 0.0368
07:01-08:00, Mon., 15 Apr. 0.0383 0.0348 0.0368
06:01-07:00, Mon., 15 Apr. 0.0389 0.0351 0.0370
05:01-06:00, Mon., 15 Apr. 0.0389 0.0349 0.0368
04:01-05:00, Mon., 15 Apr. 0.0385 0.0347 0.0365
03:01-04:00, Mon., 15 Apr. 0.0389 0.0342 0.0367
02:01-03:00, Mon., 15 Apr. 0.0384 0.0344 0.0365
01:01-02:00, Mon., 15 Apr. 0.0391 0.0347 0.0367
00:01-01:00, Mon., 15 Apr. 0.0391 0.0343 0.0367
23:01-24:00, Sun., 14 Apr. 0.0398 0.0349 0.0369
22:01-23:00, Sun., 14 Apr. 0.0396 0.0347 0.0367
21:01-22:00, Sun., 14 Apr. 0.0392 0.0343 0.0365
20:01-21:00, Sun., 14 Apr. 0.0388 0.0345 0.0368
19:01-20:00, Sun., 14 Apr. 0.0385 0.0344 0.0369
18:01-19:00, Sun., 14 Apr. 0.0393 0.0347 0.0370
17:01-18:00, Sun., 14 Apr. 0.0391 0.0349 0.0368
16:01-17:00, Sun., 14 Apr. 0.0398 0.0344 0.0372
15:01-16:00, Sun., 14 Apr. 0.0394 0.0347 0.0371
14:01-15:00, Sun., 14 Apr. 0.0391 0.0347 0.0368
13:01-14:00, Sun., 14 Apr. 0.0391 0.0341 0.0369
12:01-13:00, Sun., 14 Apr. 0.0396 0.0352 0.0370
11:01-12:00, Sun., 14 Apr. 0.0388 0.0347 0.0367
10:01-11:00, Sun., 14 Apr. 0.0385 0.0342 0.0368
09:01-10:00, Sun., 14 Apr. 0.0394 0.0346 0.0366
08:01-09:00, Sun., 14 Apr. 0.0389 0.0344 0.0366
07:01-08:00, Sun., 14 Apr. 0.0385 0.0349 0.0368
06:01-07:00, Sun., 14 Apr. 0.0383 0.0350 0.0368
05:01-06:00, Sun., 14 Apr. 0.0398 0.0349 0.0369
04:01-05:00, Sun., 14 Apr. 0.0388 0.0342 0.0366
03:01-04:00, Sun., 14 Apr. 0.0389 0.0345 0.0367
02:01-03:00, Sun., 14 Apr. 0.0397 0.0345 0.0366
01:01-02:00, Sun., 14 Apr. 0.0393 0.0350 0.0368
00:01-01:00, Sun., 14 Apr. 0.0384 0.0344 0.0366
23:01-24:00, Sat., 13 Apr. 0.0389 0.0349 0.0368
22:01-23:00, Sat., 13 Apr. 0.0392 0.0343 0.0367
21:01-22:00, Sat., 13 Apr. 0.0391 0.0340 0.0365
20:01-21:00, Sat., 13 Apr. 0.0388 0.0343 0.0364
19:01-20:00, Sat., 13 Apr. 0.0387 0.0343 0.0364
18:01-19:00, Sat., 13 Apr. 0.0401 0.0341 0.0365
17:01-18:00, Sat., 13 Apr. 0.0391 0.0345 0.0367
16:01-17:00, Sat., 13 Apr. 0.0386 0.0350 0.0368
15:01-16:00, Sat., 13 Apr. 0.0390 0.0347 0.0369
14:01-15:00, Sat., 13 Apr. 0.0381 0.0352 0.0368
13:01-14:00, Sat., 13 Apr. 0.0388 0.0347 0.0368
12:01-13:00, Sat., 13 Apr. 0.0386 0.0347 0.0368
11:01-12:00, Sat., 13 Apr. 0.0390 0.0351 0.0368
10:01-11:00, Sat., 13 Apr. 0.0402 0.0348 0.0368
09:01-10:00, Sat., 13 Apr. 0.0388 0.0347 0.0366
08:01-09:00, Sat., 13 Apr. 0.0390 0.0343 0.0367
07:01-08:00, Sat., 13 Apr. 0.0382 0.0347 0.0366
06:01-07:00, Sat., 13 Apr. 0.0395 0.0346 0.0368
05:01-06:00, Sat., 13 Apr. 0.0390 0.0348 0.0368
04:01-05:00, Sat., 13 Apr. 0.0392 0.0343 0.0369
03:01-04:00, Sat., 13 Apr. 0.0384 0.0346 0.0368
02:01-03:00, Sat., 13 Apr. 0.0389 0.0348 0.0369
01:01-02:00, Sat., 13 Apr. 0.0392 0.0346 0.0366
00:01-01:00, Sat., 13 Apr. 0.0391 0.0341 0.0367
23:01-24:00, Fri., 12 Apr. 0.0386 0.0347 0.0366
22:01-23:00, Fri., 12 Apr. 0.0396 0.0343 0.0365
21:01-22:00, Fri., 12 Apr. 0.0384 0.0350 0.0367
20:01-21:00, Fri., 12 Apr. 0.0391 0.0344 0.0366
19:01-20:00, Fri., 12 Apr. 0.0384 0.0345 0.0365
18:01-19:00, Fri., 12 Apr. 0.0397 0.0348 0.0365
17:01-18:00, Fri., 12 Apr. 0.0386 0.0344 0.0364
16:01-17:00, Fri., 12 Apr. 0.0389 0.0353 0.0368
15:01-16:00, Fri., 12 Apr. 0.0396 0.0339 0.0365
14:01-15:00, Fri., 12 Apr. 0.0391 0.0353 0.0369
13:01-14:00, Fri., 12 Apr. 0.0411 0.0353 0.0379
12:01-13:00, Fri., 12 Apr. 0.0414 0.0367 0.0389
11:01-12:00, Fri., 12 Apr. 0.0402 0.0352 0.0376
10:01-11:00, Fri., 12 Apr. 0.0391 0.0348 0.0367
09:01-10:00, Fri., 12 Apr. 0.0397 0.0342 0.0370
08:01-09:00, Fri., 12 Apr. 0.0387 0.0344 0.0367
07:01-08:00, Fri., 12 Apr. 0.0388 0.0347 0.0367
06:01-07:00, Fri., 12 Apr. 0.0388 0.0346 0.0366
05:01-06:00, Fri., 12 Apr. 0.0388 0.0348 0.0370
04:01-05:00, Fri., 12 Apr. 0.0400 0.0350 0.0368
03:01-04:00, Fri., 12 Apr. 0.0386 0.0343 0.0366
02:01-03:00, Fri., 12 Apr. 0.0390 0.0346 0.0367
01:01-02:00, Fri., 12 Apr. 0.0390 0.0346 0.0367
00:01-01:00, Fri., 12 Apr. 0.0381 0.0344 0.0364
23:01-24:00, Thu., 11 Apr. 0.0386 0.0340 0.0367
22:01-23:00, Thu., 11 Apr. 0.0393 0.0345 0.0366
21:01-22:00, Thu., 11 Apr. 0.0390 0.0342 0.0367
20:01-21:00, Thu., 11 Apr. 0.0389 0.0342 0.0367
19:01-20:00, Thu., 11 Apr. 0.0391 0.0343 0.0366
18:01-19:00, Thu., 11 Apr. 0.0382 0.0340 0.0364
17:01-18:00, Thu., 11 Apr. 0.0395 0.0343 0.0366
16:01-17:00, Thu., 11 Apr. 0.0387 0.0342 0.0367
15:01-16:00, Thu., 11 Apr. 0.0385 0.0350 0.0367
14:01-15:00, Thu., 11 Apr. 0.0391 0.0348 0.0367
13:01-14:00, Thu., 11 Apr. 0.0384 0.0340 0.0366
12:01-13:00, Thu., 11 Apr. 0.0391 0.0343 0.0367
11:01-12:00, Thu., 11 Apr. 0.0389 0.0344 0.0364
10:01-11:00, Thu., 11 Apr. 0.0389 0.0335 0.0366
09:01-10:00, Thu., 11 Apr. 0.0389 0.0346 0.0362
08:01-09:00, Thu., 11 Apr. 0.0394 0.0347 0.0365
07:01-08:00, Thu., 11 Apr. 0.0388 0.0345 0.0369
06:01-07:00, Thu., 11 Apr. 0.0384 0.0343 0.0368
05:01-06:00, Thu., 11 Apr. 0.0385 0.0347 0.0367
04:01-05:00, Thu., 11 Apr. 0.0384 0.0346 0.0367
03:01-04:00, Thu., 11 Apr. 0.0387 0.0346 0.0367
02:01-03:00, Thu., 11 Apr. 0.0384 0.0344 0.0366
01:01-02:00, Thu., 11 Apr. 0.0385 0.0342 0.0368
00:01-01:00, Thu., 11 Apr. 0.0391 0.0343 0.0367
23:01-24:00, Wed., 10 Apr. 0.0392 0.0346 0.0367