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
17:01-18:00, Mon., 20 Apr. 0.0389 0.0347 0.0367
16:01-17:00, Mon., 20 Apr. 0.0397 0.0347 0.0369
15:01-16:00, Mon., 20 Apr. 0.0397 0.0350 0.0369
14:01-15:00, Mon., 20 Apr. 0.0396 0.0350 0.0369
13:01-14:00, Mon., 20 Apr. 0.0390 0.0350 0.0368
12:01-13:00, Mon., 20 Apr. 0.0381 0.0347 0.0366
11:01-12:00, Mon., 20 Apr. 0.0388 0.0345 0.0364
10:01-11:00, Mon., 20 Apr. 0.0386 0.0345 0.0366
09:01-10:00, Mon., 20 Apr. 0.0389 0.0349 0.0366
08:01-09:00, Mon., 20 Apr. 0.0393 0.0350 0.0368
07:01-08:00, Mon., 20 Apr. 0.0384 0.0346 0.0365
06:01-07:00, Mon., 20 Apr. 0.0388 0.0349 0.0367
05:01-06:00, Mon., 20 Apr. 0.0392 0.0347 0.0366
04:01-05:00, Mon., 20 Apr. 0.0389 0.0333 0.0366
03:01-04:00, Mon., 20 Apr. 0.0392 0.0348 0.0367
02:01-03:00, Mon., 20 Apr. 0.0382 0.0343 0.0368
01:01-02:00, Mon., 20 Apr. 0.0388 0.0347 0.0366
00:01-01:00, Mon., 20 Apr. 0.0382 0.0345 0.0365
23:01-24:00, Sun., 19 Apr. 0.0388 0.0343 0.0365
22:01-23:00, Sun., 19 Apr. 0.0384 0.0344 0.0366
21:01-22:00, Sun., 19 Apr. 0.0392 0.0350 0.0364
20:01-21:00, Sun., 19 Apr. 0.0389 0.0346 0.0366
19:01-20:00, Sun., 19 Apr. 0.0383 0.0349 0.0367
18:01-19:00, Sun., 19 Apr. 0.0391 0.0350 0.0368
17:01-18:00, Sun., 19 Apr. 0.0388 0.0347 0.0365
16:01-17:00, Sun., 19 Apr. 0.0386 0.0345 0.0370
15:01-16:00, Sun., 19 Apr. 0.0393 0.0352 0.0370
14:01-15:00, Sun., 19 Apr. 0.0391 0.0347 0.0367
13:01-14:00, Sun., 19 Apr. 0.0397 0.0341 0.0365
12:01-13:00, Sun., 19 Apr. 0.0391 0.0344 0.0368
11:01-12:00, Sun., 19 Apr. 0.0381 0.0341 0.0367
10:01-11:00, Sun., 19 Apr. 0.0384 0.0346 0.0368
09:01-10:00, Sun., 19 Apr. 0.0382 0.0352 0.0368
08:01-09:00, Sun., 19 Apr. 0.0394 0.0344 0.0368
07:01-08:00, Sun., 19 Apr. 0.0389 0.0343 0.0367
06:01-07:00, Sun., 19 Apr. 0.0391 0.0347 0.0364
05:01-06:00, Sun., 19 Apr. 0.0385 0.0343 0.0364
04:01-05:00, Sun., 19 Apr. 0.0388 0.0342 0.0367
03:01-04:00, Sun., 19 Apr. 0.0389 0.0340 0.0365
02:01-03:00, Sun., 19 Apr. 0.0389 0.0338 0.0364
01:01-02:00, Sun., 19 Apr. 0.0390 0.0339 0.0363
00:01-01:00, Sun., 19 Apr. 0.0382 0.0343 0.0364
23:01-24:00, Sat., 18 Apr. 0.0387 0.0345 0.0363
22:01-23:00, Sat., 18 Apr. 0.0387 0.0341 0.0364
21:01-22:00, Sat., 18 Apr. 0.0390 0.0343 0.0363
20:01-21:00, Sat., 18 Apr. 0.0384 0.0340 0.0363
19:01-20:00, Sat., 18 Apr. 0.0385 0.0340 0.0365
18:01-19:00, Sat., 18 Apr. 0.0378 0.0343 0.0361
17:01-18:00, Sat., 18 Apr. 0.0391 0.0340 0.0365
16:01-17:00, Sat., 18 Apr. 0.0392 0.0353 0.0367
15:01-16:00, Sat., 18 Apr. 0.0384 0.0343 0.0363
14:01-15:00, Sat., 18 Apr. 0.0384 0.0337 0.0362
13:01-14:00, Sat., 18 Apr. 0.0386 0.0337 0.0363
12:01-13:00, Sat., 18 Apr. 0.0388 0.0345 0.0363
11:01-12:00, Sat., 18 Apr. 0.0391 0.0339 0.0363
10:01-11:00, Sat., 18 Apr. 0.0383 0.0341 0.0363
09:01-10:00, Sat., 18 Apr. 0.0384 0.0339 0.0363
08:01-09:00, Sat., 18 Apr. 0.0388 0.0350 0.0365
07:01-08:00, Sat., 18 Apr. 0.0379 0.0339 0.0362
06:01-07:00, Sat., 18 Apr. 0.0384 0.0343 0.0364
05:01-06:00, Sat., 18 Apr. 0.0390 0.0342 0.0363
04:01-05:00, Sat., 18 Apr. 0.0382 0.0339 0.0363
03:01-04:00, Sat., 18 Apr. 0.0391 0.0336 0.0363
02:01-03:00, Sat., 18 Apr. 0.0378 0.0340 0.0363
01:01-02:00, Sat., 18 Apr. 0.0376 0.0337 0.0360
00:01-01:00, Sat., 18 Apr. 0.0380 0.0343 0.0360
23:01-24:00, Fri., 17 Apr. 0.0387 0.0341 0.0364
22:01-23:00, Fri., 17 Apr. 0.0383 0.0344 0.0362
21:01-22:00, Fri., 17 Apr. 0.0381 0.0336 0.0362
20:01-21:00, Fri., 17 Apr. 0.0382 0.0340 0.0364
19:01-20:00, Fri., 17 Apr. 0.0383 0.0346 0.0361
18:01-19:00, Fri., 17 Apr. 0.0384 0.0342 0.0360
17:01-18:00, Fri., 17 Apr. 0.0377 0.0337 0.0360
16:01-17:00, Fri., 17 Apr. 0.0389 0.0343 0.0363
15:01-16:00, Fri., 17 Apr. 0.0385 0.0336 0.0361
14:01-15:00, Fri., 17 Apr. 0.0381 0.0340 0.0362
13:01-14:00, Fri., 17 Apr. 0.0381 0.0340 0.0364
12:01-13:00, Fri., 17 Apr. 0.0378 0.0343 0.0361
11:01-12:00, Fri., 17 Apr. 0.0376 0.0335 0.0360
10:01-11:00, Fri., 17 Apr. 0.0382 0.0345 0.0362
09:01-10:00, Fri., 17 Apr. 0.0381 0.0342 0.0363
08:01-09:00, Fri., 17 Apr. 0.0383 0.0342 0.0362
07:01-08:00, Fri., 17 Apr. 0.0391 0.0341 0.0363
06:01-07:00, Fri., 17 Apr. 0.0391 0.0338 0.0363
05:01-06:00, Fri., 17 Apr. 0.0388 0.0333 0.0361
04:01-05:00, Fri., 17 Apr. 0.0384 0.0347 0.0364
03:01-04:00, Fri., 17 Apr. 0.0380 0.0342 0.0361
02:01-03:00, Fri., 17 Apr. 0.0387 0.0347 0.0363
01:01-02:00, Fri., 17 Apr. 0.0381 0.0338 0.0361
00:01-01:00, Fri., 17 Apr. 0.0386 0.0337 0.0361
23:01-24:00, Thu., 16 Apr. 0.0387 0.0343 0.0363
22:01-23:00, Thu., 16 Apr. 0.0380 0.0339 0.0361
21:01-22:00, Thu., 16 Apr. 0.0383 0.0341 0.0362
20:01-21:00, Thu., 16 Apr. 0.0385 0.0333 0.0360
19:01-20:00, Thu., 16 Apr. 0.0384 0.0342 0.0361
18:01-19:00, Thu., 16 Apr. 0.0403 0.0340 0.0362
17:01-18:00, Thu., 16 Apr. 0.0387 0.0340 0.0362
16:01-17:00, Thu., 16 Apr. 0.0380 0.0343 0.0363
15:01-16:00, Thu., 16 Apr. 0.0381 0.0338 0.0364
14:01-15:00, Thu., 16 Apr. 0.0384 0.0340 0.0364
13:01-14:00, Thu., 16 Apr. 0.0387 0.0344 0.0365
12:01-13:00, Thu., 16 Apr. 0.0389 0.0348 0.0364
11:01-12:00, Thu., 16 Apr. 0.0381 0.0340 0.0363
10:01-11:00, Thu., 16 Apr. 0.0384 0.0333 0.0361
09:01-10:00, Thu., 16 Apr. 0.0384 0.0343 0.0365
08:01-09:00, Thu., 16 Apr. 0.0380 0.0342 0.0362
07:01-08:00, Thu., 16 Apr. 0.0381 0.0347 0.0365
06:01-07:00, Thu., 16 Apr. 0.0386 0.0341 0.0363
05:01-06:00, Thu., 16 Apr. 0.0387 0.0347 0.0365
04:01-05:00, Thu., 16 Apr. 0.0391 0.0350 0.0370
03:01-04:00, Thu., 16 Apr. 0.0401 0.0357 0.0379
02:01-03:00, Thu., 16 Apr. 0.0418 0.0362 0.0385
01:01-02:00, Thu., 16 Apr. 0.0404 0.0333 0.0382
00:01-01:00, Thu., 16 Apr. 0.0410 0.0367 0.0391
23:01-24:00, Wed., 15 Apr. 0.0434 0.0382 0.0408
22:01-23:00, Wed., 15 Apr. 0.0448 0.0394 0.0424
21:01-22:00, Wed., 15 Apr. 0.0434 0.0381 0.0410
20:01-21:00, Wed., 15 Apr. 0.0436 0.0383 0.0409
19:01-20:00, Wed., 15 Apr. 0.0406 0.0352 0.0379
18:01-19:00, Wed., 15 Apr. 0.0392 0.0350 0.0372
17:01-18:00, Wed., 15 Apr. 0.0388 0.0336 0.0362
16:01-17:00, Wed., 15 Apr. 0.0384 0.0340 0.0361
15:01-16:00, Wed., 15 Apr. 0.0394 0.0343 0.0364
14:01-15:00, Wed., 15 Apr. 0.0384 0.0343 0.0365
13:01-14:00, Wed., 15 Apr. 0.0378 0.0340 0.0363
12:01-13:00, Wed., 15 Apr. 0.0387 0.0341 0.0364
11:01-12:00, Wed., 15 Apr. 0.0387 0.0342 0.0364
10:01-11:00, Wed., 15 Apr. 0.0389 0.0344 0.0365
09:01-10:00, Wed., 15 Apr. 0.0388 0.0346 0.0366
08:01-09:00, Wed., 15 Apr. 0.0381 0.0334 0.0361
07:01-08:00, Wed., 15 Apr. 0.0391 0.0342 0.0363
06:01-07:00, Wed., 15 Apr. 0.0383 0.0344 0.0363
05:01-06:00, Wed., 15 Apr. 0.0382 0.0345 0.0363
04:01-05:00, Wed., 15 Apr. 0.0399 0.0339 0.0367
03:01-04:00, Wed., 15 Apr. 0.0382 0.0342 0.0364
02:01-03:00, Wed., 15 Apr. 0.0390 0.0340 0.0365
01:01-02:00, Wed., 15 Apr. 0.0389 0.0347 0.0366
00:01-01:00, Wed., 15 Apr. 0.0385 0.0347 0.0366
23:01-24:00, Tue., 14 Apr. 0.0384 0.0347 0.0366
22:01-23:00, Tue., 14 Apr. 0.0391 0.0344 0.0367
21:01-22:00, Tue., 14 Apr. 0.0395 0.0348 0.0366
20:01-21:00, Tue., 14 Apr. 0.0394 0.0338 0.0363
19:01-20:00, Tue., 14 Apr. 0.0383 0.0333 0.0362
18:01-19:00, Tue., 14 Apr. 0.0390 0.0343 0.0363
17:01-18:00, Tue., 14 Apr. 0.0384 0.0344 0.0366
16:01-17:00, Tue., 14 Apr. 0.0399 0.0347 0.0367
15:01-16:00, Tue., 14 Apr. 0.0392 0.0340 0.0366
14:01-15:00, Tue., 14 Apr. 0.0394 0.0346 0.0369
13:01-14:00, Tue., 14 Apr. 0.0387 0.0350 0.0367
12:01-13:00, Tue., 14 Apr. 0.0377 0.0342 0.0364
11:01-12:00, Tue., 14 Apr. 0.0381 0.0343 0.0364
10:01-11:00, Tue., 14 Apr. 0.0389 0.0339 0.0368
09:01-10:00, Tue., 14 Apr. 0.0385 0.0344 0.0366
08:01-09:00, Tue., 14 Apr. 0.0395 0.0344 0.0366
07:01-08:00, Tue., 14 Apr. 0.0386 0.0347 0.0368
06:01-07:00, Tue., 14 Apr. 0.0384 0.0338 0.0367
05:01-06:00, Tue., 14 Apr. 0.0390 0.0342 0.0367
04:01-05:00, Tue., 14 Apr. 0.0388 0.0349 0.0366
03:01-04:00, Tue., 14 Apr. 0.0389 0.0347 0.0366
02:01-03:00, Tue., 14 Apr. 0.0382 0.0343 0.0366
01:01-02:00, Tue., 14 Apr. 0.0392 0.0338 0.0366
00:01-01:00, Tue., 14 Apr. 0.0384 0.0339 0.0364
23:01-24:00, Mon., 13 Apr. 0.0390 0.0343 0.0364
22:01-23:00, Mon., 13 Apr. 0.0383 0.0346 0.0366
21:01-22:00, Mon., 13 Apr. 0.0380 0.0348 0.0365
20:01-21:00, Mon., 13 Apr. 0.0391 0.0344 0.0365
19:01-20:00, Mon., 13 Apr. 0.0385 0.0345 0.0364
18:01-19:00, Mon., 13 Apr. 0.0381 0.0343 0.0363
17:01-18:00, Mon., 13 Apr. 0.0394 0.0344 0.0367
16:01-17:00, Mon., 13 Apr. 0.0382 0.0340 0.0365
15:01-16:00, Mon., 13 Apr. 0.0389 0.0340 0.0364
14:01-15:00, Mon., 13 Apr. 0.0391 0.0345 0.0364
13:01-14:00, Mon., 13 Apr. 0.0387 0.0343 0.0363
12:01-13:00, Mon., 13 Apr. 0.0385 0.0346 0.0366
11:01-12:00, Mon., 13 Apr. 0.0388 0.0347 0.0364
10:01-11:00, Mon., 13 Apr. 0.0391 0.0345 0.0366
09:01-10:00, Mon., 13 Apr. 0.0398 0.0346 0.0365
08:01-09:00, Mon., 13 Apr. 0.0380 0.0345 0.0367
07:01-08:00, Mon., 13 Apr. 0.0396 0.0350 0.0370
06:01-07:00, Mon., 13 Apr. 0.0395 0.0349 0.0369
05:01-06:00, Mon., 13 Apr. 0.0390 0.0340 0.0366
04:01-05:00, Mon., 13 Apr. 0.0398 0.0330 0.0364
03:01-04:00, Mon., 13 Apr. 0.0384 0.0340 0.0365
02:01-03:00, Mon., 13 Apr. 0.0387 0.0343 0.0366
01:01-02:00, Mon., 13 Apr. 0.0381 0.0344 0.0365
00:01-01:00, Mon., 13 Apr. 0.0381 0.0343 0.0364
23:01-24:00, Sun., 12 Apr. 0.0392 0.0344 0.0367
22:01-23:00, Sun., 12 Apr. 0.0391 0.0343 0.0366
21:01-22:00, Sun., 12 Apr. 0.0388 0.0351 0.0366
20:01-21:00, Sun., 12 Apr. 0.0387 0.0345 0.0366
19:01-20:00, Sun., 12 Apr. 0.0382 0.0342 0.0364
18:01-19:00, Sun., 12 Apr. 0.0388 0.0346 0.0367
17:01-18:00, Sun., 12 Apr. 0.0385 0.0347 0.0367
16:01-17:00, Sun., 12 Apr. 0.0387 0.0331 0.0367
15:01-16:00, Sun., 12 Apr. 0.0391 0.0349 0.0368
14:01-15:00, Sun., 12 Apr. 0.0387 0.0346 0.0366
13:01-14:00, Sun., 12 Apr. 0.0392 0.0348 0.0368
12:01-13:00, Sun., 12 Apr. 0.0390 0.0339 0.0367
11:01-12:00, Sun., 12 Apr. 0.0383 0.0345 0.0366
10:01-11:00, Sun., 12 Apr. 0.0395 0.0339 0.0366
09:01-10:00, Sun., 12 Apr. 0.0386 0.0342 0.0366
08:01-09:00, Sun., 12 Apr. 0.0389 0.0345 0.0367
07:01-08:00, Sun., 12 Apr. 0.0386 0.0347 0.0368
06:01-07:00, Sun., 12 Apr. 0.0388 0.0346 0.0368
05:01-06:00, Sun., 12 Apr. 0.0390 0.0344 0.0366
04:01-05:00, Sun., 12 Apr. 0.0387 0.0343 0.0365
03:01-04:00, Sun., 12 Apr. 0.0392 0.0344 0.0366
02:01-03:00, Sun., 12 Apr. 0.0387 0.0340 0.0367
01:01-02:00, Sun., 12 Apr. 0.0388 0.0338 0.0365
00:01-01:00, Sun., 12 Apr. 0.0386 0.0345 0.0363
23:01-24:00, Sat., 11 Apr. 0.0381 0.0343 0.0363
22:01-23:00, Sat., 11 Apr. 0.0385 0.0337 0.0364
21:01-22:00, Sat., 11 Apr. 0.0388 0.0337 0.0363
20:01-21:00, Sat., 11 Apr. 0.0380 0.0345 0.0362
19:01-20:00, Sat., 11 Apr. 0.0381 0.0345 0.0364
18:01-19:00, Sat., 11 Apr. 0.0388 0.0342 0.0366
17:01-18:00, Sat., 11 Apr. 0.0381 0.0343 0.0368
16:01-17:00, Sat., 11 Apr. 0.0396 0.0336 0.0370
15:01-16:00, Sat., 11 Apr. 0.0396 0.0350 0.0372
14:01-15:00, Sat., 11 Apr. 0.0391 0.0349 0.0371
13:01-14:00, Sat., 11 Apr. 0.0391 0.0347 0.0368
12:01-13:00, Sat., 11 Apr. 0.0388 0.0337 0.0369
11:01-12:00, Sat., 11 Apr. 0.0387 0.0343 0.0366
10:01-11:00, Sat., 11 Apr. 0.0391 0.0346 0.0365
09:01-10:00, Sat., 11 Apr. 0.0386 0.0351 0.0368
08:01-09:00, Sat., 11 Apr. 0.0387 0.0347 0.0368
07:01-08:00, Sat., 11 Apr. 0.0386 0.0346 0.0368
06:01-07:00, Sat., 11 Apr. 0.0392 0.0339 0.0366
05:01-06:00, Sat., 11 Apr. 0.0393 0.0342 0.0366
04:01-05:00, Sat., 11 Apr. 0.0384 0.0343 0.0364
03:01-04:00, Sat., 11 Apr. 0.0388 0.0344 0.0363
02:01-03:00, Sat., 11 Apr. 0.0398 0.0349 0.0362
01:01-02:00, Sat., 11 Apr. 0.0384 0.0343 0.0366
00:01-01:00, Sat., 11 Apr. 0.0389 0.0332 0.0361
23:01-24:00, Fri., 10 Apr. 0.0393 0.0330 0.0363
22:01-23:00, Fri., 10 Apr. 0.0407 0.0352 0.0375
21:01-22:00, Fri., 10 Apr. 0.0443 0.0363 0.0406
20:01-21:00, Fri., 10 Apr. 0.0540 0.0432 0.0490
19:01-20:00, Fri., 10 Apr. 0.0543 0.0419 0.0474
18:01-19:00, Fri., 10 Apr. 0.0445 0.0383 0.0412