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
07:01-08:00, Sat., 22 Aug. 0.0381 0.0347 0.0365
06:01-07:00, Sat., 22 Aug. 0.0391 0.0339 0.0365
05:01-06:00, Sat., 22 Aug. 0.0388 0.0340 0.0367
04:01-05:00, Sat., 22 Aug. 0.0384 0.0349 0.0364
03:01-04:00, Sat., 22 Aug. 0.0381 0.0333 0.0362
02:01-03:00, Sat., 22 Aug. 0.0379 0.0343 0.0364
01:01-02:00, Sat., 22 Aug. 0.0383 0.0342 0.0364
00:01-01:00, Sat., 22 Aug. 0.0387 0.0343 0.0364
23:01-24:00, Fri., 21 Aug. 0.0387 0.0350 0.0367
22:01-23:00, Fri., 21 Aug. 0.0388 0.0342 0.0370
21:01-22:00, Fri., 21 Aug. 0.0420 0.0357 0.0388
20:01-21:00, Fri., 21 Aug. 0.0433 0.0371 0.0400
19:01-20:00, Fri., 21 Aug. 0.0384 0.0343 0.0368
18:01-19:00, Fri., 21 Aug. 0.0388 0.0337 0.0365
17:01-18:00, Fri., 21 Aug. 0.0384 0.0343 0.0366
16:01-17:00, Fri., 21 Aug. 0.0390 0.0343 0.0368
15:01-16:00, Fri., 21 Aug. 0.0396 0.0351 0.0371
14:01-15:00, Fri., 21 Aug. 0.0390 0.0342 0.0367
13:01-14:00, Fri., 21 Aug. 0.0395 0.0343 0.0364
12:01-13:00, Fri., 21 Aug. 0.0383 0.0343 0.0365
11:01-12:00, Fri., 21 Aug. 0.0379 0.0338 0.0364
10:01-11:00, Fri., 21 Aug. 0.0388 0.0350 0.0366
09:01-10:00, Fri., 21 Aug. 0.0386 0.0335 0.0363
08:01-09:00, Fri., 21 Aug. 0.0382 0.0343 0.0363
07:01-08:00, Fri., 21 Aug. 0.0382 0.0334 0.0366
06:01-07:00, Fri., 21 Aug. 0.0378 0.0341 0.0363
05:01-06:00, Fri., 21 Aug. 0.0380 0.0332 0.0360
04:01-05:00, Fri., 21 Aug. 0.0388 0.0339 0.0364
03:01-04:00, Fri., 21 Aug. 0.0383 0.0343 0.0364
02:01-03:00, Fri., 21 Aug. 0.0388 0.0340 0.0363
01:01-02:00, Fri., 21 Aug. 0.0390 0.0343 0.0363
00:01-01:00, Fri., 21 Aug. 0.0385 0.0343 0.0363
23:01-24:00, Thu., 20 Aug. 0.0385 0.0343 0.0366
22:01-23:00, Thu., 20 Aug. 0.0385 0.0342 0.0364
21:01-22:00, Thu., 20 Aug. 0.0387 0.0336 0.0364
20:01-21:00, Thu., 20 Aug. 0.0385 0.0343 0.0363
19:01-20:00, Thu., 20 Aug. 0.0391 0.0334 0.0364
18:01-19:00, Thu., 20 Aug. 0.0381 0.0340 0.0361
17:01-18:00, Thu., 20 Aug. 0.0379 0.0342 0.0360
16:01-17:00, Thu., 20 Aug. 0.0383 0.0341 0.0362
15:01-16:00, Thu., 20 Aug. 0.0388 0.0343 0.0362
14:01-15:00, Thu., 20 Aug. 0.0384 0.0338 0.0362
13:01-14:00, Thu., 20 Aug. 0.0388 0.0343 0.0364
12:01-13:00, Thu., 20 Aug. 0.0384 0.0347 0.0363
11:01-12:00, Thu., 20 Aug. 0.0386 0.0341 0.0363
10:01-11:00, Thu., 20 Aug. 0.0396 0.0343 0.0364
09:01-10:00, Thu., 20 Aug. 0.0384 0.0339 0.0363
08:01-09:00, Thu., 20 Aug. 0.0384 0.0337 0.0362
07:01-08:00, Thu., 20 Aug. 0.0388 0.0330 0.0363
06:01-07:00, Thu., 20 Aug. 0.0391 0.0346 0.0366
05:01-06:00, Thu., 20 Aug. 0.0386 0.0340 0.0363
04:01-05:00, Thu., 20 Aug. 0.0381 0.0345 0.0364
03:01-04:00, Thu., 20 Aug. 0.0386 0.0341 0.0362
02:01-03:00, Thu., 20 Aug. 0.0388 0.0339 0.0364
01:01-02:00, Thu., 20 Aug. 0.0381 0.0342 0.0364
00:01-01:00, Thu., 20 Aug. 0.0391 0.0343 0.0365
23:01-24:00, Wed., 19 Aug. 0.0380 0.0337 0.0361
22:01-23:00, Wed., 19 Aug. 0.0399 0.0343 0.0364
21:01-22:00, Wed., 19 Aug. 0.0383 0.0333 0.0362
20:01-21:00, Wed., 19 Aug. 0.0386 0.0339 0.0363
19:01-20:00, Wed., 19 Aug. 0.0386 0.0340 0.0363
18:01-19:00, Wed., 19 Aug. 0.0376 0.0338 0.0360
17:01-18:00, Wed., 19 Aug. 0.0380 0.0345 0.0362
16:01-17:00, Wed., 19 Aug. 0.0379 0.0344 0.0361
15:01-16:00, Wed., 19 Aug. 0.0384 0.0342 0.0363
14:01-15:00, Wed., 19 Aug. 0.0388 0.0343 0.0365
13:01-14:00, Wed., 19 Aug. 0.0381 0.0335 0.0364
12:01-13:00, Wed., 19 Aug. 0.0385 0.0343 0.0361
11:01-12:00, Wed., 19 Aug. 0.0392 0.0334 0.0362
10:01-11:00, Wed., 19 Aug. 0.0383 0.0338 0.0362
09:01-10:00, Wed., 19 Aug. 0.0381 0.0343 0.0362
08:01-09:00, Wed., 19 Aug. 0.0381 0.0338 0.0363
07:01-08:00, Wed., 19 Aug. 0.0381 0.0344 0.0362
06:01-07:00, Wed., 19 Aug. 0.0393 0.0340 0.0361
05:01-06:00, Wed., 19 Aug. 0.0381 0.0345 0.0363
04:01-05:00, Wed., 19 Aug. 0.0380 0.0335 0.0359
03:01-04:00, Wed., 19 Aug. 0.0380 0.0345 0.0360
02:01-03:00, Wed., 19 Aug. 0.0384 0.0337 0.0361
01:01-02:00, Wed., 19 Aug. 0.0384 0.0340 0.0363
00:01-01:00, Wed., 19 Aug. 0.0384 0.0343 0.0363
23:01-24:00, Tue., 18 Aug. 0.0382 0.0347 0.0362
22:01-23:00, Tue., 18 Aug. 0.0391 0.0345 0.0365
21:01-22:00, Tue., 18 Aug. 0.0389 0.0338 0.0365
20:01-21:00, Tue., 18 Aug. 0.0388 0.0347 0.0365
19:01-20:00, Tue., 18 Aug. 0.0390 0.0341 0.0363
18:01-19:00, Tue., 18 Aug. 0.0378 0.0336 0.0359
17:01-18:00, Tue., 18 Aug. 0.0386 0.0339 0.0360
16:01-17:00, Tue., 18 Aug. 0.0378 0.0337 0.0358
15:01-16:00, Tue., 18 Aug. 0.0383 0.0342 0.0361
14:01-15:00, Tue., 18 Aug. 0.0378 0.0336 0.0360
13:01-14:00, Tue., 18 Aug. 0.0387 0.0341 0.0362
12:01-13:00, Tue., 18 Aug. 0.0385 0.0347 0.0364
11:01-12:00, Tue., 18 Aug. 0.0386 0.0335 0.0362
10:01-11:00, Tue., 18 Aug. 0.0381 0.0345 0.0362
09:01-10:00, Tue., 18 Aug. 0.0376 0.0339 0.0358
08:01-09:00, Tue., 18 Aug. 0.0379 0.0338 0.0357
07:01-08:00, Tue., 18 Aug. 0.0378 0.0338 0.0359
06:01-07:00, Tue., 18 Aug. 0.0381 0.0343 0.0360
05:01-06:00, Tue., 18 Aug. 0.0378 0.0339 0.0359
04:01-05:00, Tue., 18 Aug. 0.0381 0.0344 0.0361
03:01-04:00, Tue., 18 Aug. 0.0383 0.0338 0.0360
02:01-03:00, Tue., 18 Aug. 0.0376 0.0338 0.0360
01:01-02:00, Tue., 18 Aug. 0.0381 0.0340 0.0361
00:01-01:00, Tue., 18 Aug. 0.0379 0.0338 0.0361
23:01-24:00, Mon., 17 Aug. 0.0381 0.0329 0.0359
22:01-23:00, Mon., 17 Aug. 0.0380 0.0344 0.0362
21:01-22:00, Mon., 17 Aug. 0.0385 0.0336 0.0360
20:01-21:00, Mon., 17 Aug. 0.0387 0.0333 0.0363
19:01-20:00, Mon., 17 Aug. 0.0388 0.0343 0.0361
18:01-19:00, Mon., 17 Aug. 0.0386 0.0342 0.0361
17:01-18:00, Mon., 17 Aug. 0.0381 0.0346 0.0361
16:01-17:00, Mon., 17 Aug. 0.0381 0.0342 0.0361
15:01-16:00, Mon., 17 Aug. 0.0383 0.0336 0.0361
14:01-15:00, Mon., 17 Aug. 0.0390 0.0340 0.0363
13:01-14:00, Mon., 17 Aug. 0.0384 0.0346 0.0365
12:01-13:00, Mon., 17 Aug. 0.0387 0.0349 0.0362
11:01-12:00, Mon., 17 Aug. 0.0375 0.0340 0.0358
10:01-11:00, Mon., 17 Aug. 0.0380 0.0334 0.0360
09:01-10:00, Mon., 17 Aug. 0.0379 0.0345 0.0360
08:01-09:00, Mon., 17 Aug. 0.0378 0.0343 0.0358
07:01-08:00, Mon., 17 Aug. 0.0379 0.0339 0.0363
06:01-07:00, Mon., 17 Aug. 0.0383 0.0336 0.0361
05:01-06:00, Mon., 17 Aug. 0.0388 0.0326 0.0360
04:01-05:00, Mon., 17 Aug. 0.0382 0.0343 0.0360
03:01-04:00, Mon., 17 Aug. 0.0387 0.0342 0.0359
02:01-03:00, Mon., 17 Aug. 0.0381 0.0340 0.0359
01:01-02:00, Mon., 17 Aug. 0.0381 0.0334 0.0360
00:01-01:00, Mon., 17 Aug. 0.0377 0.0336 0.0359
23:01-24:00, Sun., 16 Aug. 0.0385 0.0331 0.0357
22:01-23:00, Sun., 16 Aug. 0.0378 0.0337 0.0355
21:01-22:00, Sun., 16 Aug. 0.0381 0.0341 0.0358
20:01-21:00, Sun., 16 Aug. 0.0396 0.0337 0.0360
19:01-20:00, Sun., 16 Aug. 0.0381 0.0336 0.0357
18:01-19:00, Sun., 16 Aug. 0.0386 0.0344 0.0359
17:01-18:00, Sun., 16 Aug. 0.0384 0.0332 0.0359
16:01-17:00, Sun., 16 Aug. 0.0391 0.0337 0.0359
15:01-16:00, Sun., 16 Aug. 0.0385 0.0342 0.0363
14:01-15:00, Sun., 16 Aug. 0.0397 0.0347 0.0373
13:01-14:00, Sun., 16 Aug. 0.0398 0.0361 0.0377
12:01-13:00, Sun., 16 Aug. 0.0393 0.0343 0.0369
11:01-12:00, Sun., 16 Aug. 0.0385 0.0343 0.0363
10:01-11:00, Sun., 16 Aug. 0.0381 0.0343 0.0362
09:01-10:00, Sun., 16 Aug. 0.0388 0.0343 0.0363
08:01-09:00, Sun., 16 Aug. 0.0387 0.0338 0.0361
07:01-08:00, Sun., 16 Aug. 0.0390 0.0336 0.0362
06:01-07:00, Sun., 16 Aug. 0.0380 0.0340 0.0361
05:01-06:00, Sun., 16 Aug. 0.0381 0.0332 0.0360
04:01-05:00, Sun., 16 Aug. 0.0390 0.0336 0.0359
03:01-04:00, Sun., 16 Aug. 0.0379 0.0336 0.0360
02:01-03:00, Sun., 16 Aug. 0.0384 0.0343 0.0360
01:01-02:00, Sun., 16 Aug. 0.0382 0.0327 0.0359
00:01-01:00, Sun., 16 Aug. 0.0381 0.0343 0.0362
23:01-24:00, Sat., 15 Aug. 0.0388 0.0340 0.0359
22:01-23:00, Sat., 15 Aug. 0.0377 0.0339 0.0357
21:01-22:00, Sat., 15 Aug. 0.0385 0.0332 0.0358
20:01-21:00, Sat., 15 Aug. 0.0379 0.0339 0.0357
19:01-20:00, Sat., 15 Aug. 0.0378 0.0334 0.0359
18:01-19:00, Sat., 15 Aug. 0.0377 0.0338 0.0358
17:01-18:00, Sat., 15 Aug. 0.0381 0.0340 0.0362
16:01-17:00, Sat., 15 Aug. 0.0378 0.0346 0.0362
15:01-16:00, Sat., 15 Aug. 0.0384 0.0342 0.0363
14:01-15:00, Sat., 15 Aug. 0.0378 0.0343 0.0360
13:01-14:00, Sat., 15 Aug. 0.0381 0.0342 0.0362
12:01-13:00, Sat., 15 Aug. 0.0382 0.0341 0.0362
11:01-12:00, Sat., 15 Aug. 0.0388 0.0338 0.0361
10:01-11:00, Sat., 15 Aug. 0.0381 0.0332 0.0360
09:01-10:00, Sat., 15 Aug. 0.0378 0.0338 0.0360
08:01-09:00, Sat., 15 Aug. 0.0383 0.0330 0.0360
07:01-08:00, Sat., 15 Aug. 0.0394 0.0340 0.0361
06:01-07:00, Sat., 15 Aug. 0.0378 0.0343 0.0360
05:01-06:00, Sat., 15 Aug. 0.0382 0.0331 0.0360
04:01-05:00, Sat., 15 Aug. 0.0385 0.0335 0.0359
03:01-04:00, Sat., 15 Aug. 0.0382 0.0340 0.0360
02:01-03:00, Sat., 15 Aug. 0.0377 0.0340 0.0360
01:01-02:00, Sat., 15 Aug. 0.0381 0.0343 0.0360
00:01-01:00, Sat., 15 Aug. 0.0382 0.0333 0.0359
23:01-24:00, Fri., 14 Aug. 0.0387 0.0336 0.0359
22:01-23:00, Fri., 14 Aug. 0.0384 0.0341 0.0361
21:01-22:00, Fri., 14 Aug. 0.0376 0.0339 0.0360
20:01-21:00, Fri., 14 Aug. 0.0380 0.0336 0.0362
19:01-20:00, Fri., 14 Aug. 0.0382 0.0338 0.0361
18:01-19:00, Fri., 14 Aug. 0.0386 0.0343 0.0360
17:01-18:00, Fri., 14 Aug. 0.0380 0.0337 0.0359
16:01-17:00, Fri., 14 Aug. 0.0379 0.0340 0.0360
15:01-16:00, Fri., 14 Aug. 0.0378 0.0344 0.0361
14:01-15:00, Fri., 14 Aug. 0.0382 0.0330 0.0362
13:01-14:00, Fri., 14 Aug. 0.0387 0.0340 0.0362
12:01-13:00, Fri., 14 Aug. 0.0382 0.0347 0.0362
11:01-12:00, Fri., 14 Aug. 0.0394 0.0338 0.0360
10:01-11:00, Fri., 14 Aug. 0.0385 0.0336 0.0357
09:01-10:00, Fri., 14 Aug. 0.0376 0.0342 0.0359
08:01-09:00, Fri., 14 Aug. 0.0374 0.0344 0.0358
07:01-08:00, Fri., 14 Aug. 0.0379 0.0334 0.0359
06:01-07:00, Fri., 14 Aug. 0.0382 0.0334 0.0358
05:01-06:00, Fri., 14 Aug. 0.0379 0.0333 0.0360
04:01-05:00, Fri., 14 Aug. 0.0381 0.0347 0.0361
03:01-04:00, Fri., 14 Aug. 0.0378 0.0340 0.0361
02:01-03:00, Fri., 14 Aug. 0.0391 0.0340 0.0363
01:01-02:00, Fri., 14 Aug. 0.0402 0.0348 0.0375
00:01-01:00, Fri., 14 Aug. 0.0404 0.0353 0.0374
23:01-24:00, Thu., 13 Aug. 0.0396 0.0357 0.0375
22:01-23:00, Thu., 13 Aug. 0.0397 0.0355 0.0374
21:01-22:00, Thu., 13 Aug. 0.0402 0.0352 0.0375
20:01-21:00, Thu., 13 Aug. 0.0400 0.0347 0.0374
19:01-20:00, Thu., 13 Aug. 0.0390 0.0347 0.0369
18:01-19:00, Thu., 13 Aug. 0.0382 0.0344 0.0363
17:01-18:00, Thu., 13 Aug. 0.0379 0.0340 0.0359
16:01-17:00, Thu., 13 Aug. 0.0382 0.0336 0.0360
15:01-16:00, Thu., 13 Aug. 0.0381 0.0340 0.0360
14:01-15:00, Thu., 13 Aug. 0.0388 0.0341 0.0365
13:01-14:00, Thu., 13 Aug. 0.0384 0.0343 0.0363
12:01-13:00, Thu., 13 Aug. 0.0385 0.0348 0.0366
11:01-12:00, Thu., 13 Aug. 0.0393 0.0343 0.0367
10:01-11:00, Thu., 13 Aug. 0.0382 0.0342 0.0361
09:01-10:00, Thu., 13 Aug. 0.0383 0.0342 0.0361
08:01-09:00, Thu., 13 Aug. 0.0387 0.0329 0.0360
07:01-08:00, Thu., 13 Aug. 0.0383 0.0341 0.0361
06:01-07:00, Thu., 13 Aug. 0.0393 0.0337 0.0365
05:01-06:00, Thu., 13 Aug. 0.0384 0.0336 0.0359
04:01-05:00, Thu., 13 Aug. 0.0387 0.0338 0.0360
03:01-04:00, Thu., 13 Aug. 0.0388 0.0331 0.0357
02:01-03:00, Thu., 13 Aug. 0.0381 0.0336 0.0356
01:01-02:00, Thu., 13 Aug. 0.0371 0.0340 0.0357
00:01-01:00, Thu., 13 Aug. 0.0381 0.0339 0.0360
23:01-24:00, Wed., 12 Aug. 0.0375 0.0338 0.0359
22:01-23:00, Wed., 12 Aug. 0.0383 0.0340 0.0360
21:01-22:00, Wed., 12 Aug. 0.0380 0.0334 0.0358
20:01-21:00, Wed., 12 Aug. 0.0382 0.0343 0.0361
19:01-20:00, Wed., 12 Aug. 0.0388 0.0346 0.0365
18:01-19:00, Wed., 12 Aug. 0.0403 0.0350 0.0372
17:01-18:00, Wed., 12 Aug. 0.0384 0.0334 0.0365
16:01-17:00, Wed., 12 Aug. 0.0377 0.0336 0.0361
15:01-16:00, Wed., 12 Aug. 0.0384 0.0342 0.0362
14:01-15:00, Wed., 12 Aug. 0.0382 0.0340 0.0363
13:01-14:00, Wed., 12 Aug. 0.0388 0.0328 0.0362
12:01-13:00, Wed., 12 Aug. 0.0381 0.0334 0.0362
11:01-12:00, Wed., 12 Aug. 0.0379 0.0342 0.0360
10:01-11:00, Wed., 12 Aug. 0.0382 0.0335 0.0357
09:01-10:00, Wed., 12 Aug. 0.0387 0.0335 0.0361
08:01-09:00, Wed., 12 Aug. 0.0383 0.0342 0.0361