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
15:01-16:00, Sat., 17 Oct. 0.0394 0.0356 0.0373
14:01-15:00, Sat., 17 Oct. 0.0395 0.0351 0.0374
13:01-14:00, Sat., 17 Oct. 0.0387 0.0353 0.0372
12:01-13:00, Sat., 17 Oct. 0.0388 0.0353 0.0370
11:01-12:00, Sat., 17 Oct. 0.0403 0.0343 0.0371
10:01-11:00, Sat., 17 Oct. 0.0391 0.0349 0.0370
09:01-10:00, Sat., 17 Oct. 0.0387 0.0344 0.0372
08:01-09:00, Sat., 17 Oct. 0.0392 0.0349 0.0370
07:01-08:00, Sat., 17 Oct. 0.0387 0.0349 0.0370
06:01-07:00, Sat., 17 Oct. 0.0399 0.0353 0.0370
05:01-06:00, Sat., 17 Oct. 0.0391 0.0342 0.0371
04:01-05:00, Sat., 17 Oct. 0.0391 0.0350 0.0372
03:01-04:00, Sat., 17 Oct. 0.0395 0.0339 0.0369
02:01-03:00, Sat., 17 Oct. 0.0393 0.0340 0.0368
01:01-02:00, Sat., 17 Oct. 0.0387 0.0347 0.0369
00:01-01:00, Sat., 17 Oct. 0.0400 0.0339 0.0369
23:01-24:00, Fri., 16 Oct. 0.0396 0.0348 0.0369
22:01-23:00, Fri., 16 Oct. 0.0384 0.0344 0.0367
21:01-22:00, Fri., 16 Oct. 0.0391 0.0346 0.0369
20:01-21:00, Fri., 16 Oct. 0.0391 0.0353 0.0369
19:01-20:00, Fri., 16 Oct. 0.0383 0.0341 0.0366
18:01-19:00, Fri., 16 Oct. 0.0396 0.0346 0.0370
17:01-18:00, Fri., 16 Oct. 0.0385 0.0342 0.0367
16:01-17:00, Fri., 16 Oct. 0.0384 0.0353 0.0368
15:01-16:00, Fri., 16 Oct. 0.0387 0.0352 0.0369
14:01-15:00, Fri., 16 Oct. 0.0393 0.0353 0.0372
13:01-14:00, Fri., 16 Oct. 0.0399 0.0348 0.0373
12:01-13:00, Fri., 16 Oct. 0.0397 0.0353 0.0373
11:01-12:00, Fri., 16 Oct. 0.0389 0.0344 0.0368
10:01-11:00, Fri., 16 Oct. 0.0391 0.0343 0.0369
09:01-10:00, Fri., 16 Oct. 0.0392 0.0349 0.0370
08:01-09:00, Fri., 16 Oct. 0.0391 0.0346 0.0370
07:01-08:00, Fri., 16 Oct. 0.0389 0.0354 0.0371
06:01-07:00, Fri., 16 Oct. 0.0394 0.0350 0.0370
05:01-06:00, Fri., 16 Oct. 0.0388 0.0340 0.0370
04:01-05:00, Fri., 16 Oct. 0.0391 0.0343 0.0368
03:01-04:00, Fri., 16 Oct. 0.0391 0.0350 0.0369
02:01-03:00, Fri., 16 Oct. 0.0389 0.0351 0.0370
01:01-02:00, Fri., 16 Oct. 0.0384 0.0338 0.0365
00:01-01:00, Fri., 16 Oct. 0.0384 0.0347 0.0368
23:01-24:00, Thu., 15 Oct. 0.0383 0.0350 0.0367
22:01-23:00, Thu., 15 Oct. 0.0388 0.0351 0.0368
21:01-22:00, Thu., 15 Oct. 0.0389 0.0345 0.0367
20:01-21:00, Thu., 15 Oct. 0.0388 0.0343 0.0363
19:01-20:00, Thu., 15 Oct. 0.0395 0.0344 0.0367
18:01-19:00, Thu., 15 Oct. 0.0387 0.0347 0.0364
17:01-18:00, Thu., 15 Oct. 0.0389 0.0341 0.0365
16:01-17:00, Thu., 15 Oct. 0.0395 0.0340 0.0368
15:01-16:00, Thu., 15 Oct. 0.0391 0.0342 0.0367
14:01-15:00, Thu., 15 Oct. 0.0395 0.0348 0.0369
13:01-14:00, Thu., 15 Oct. 0.0391 0.0347 0.0369
12:01-13:00, Thu., 15 Oct. 0.0393 0.0341 0.0371
11:01-12:00, Thu., 15 Oct. 0.0409 0.0347 0.0368
10:01-11:00, Thu., 15 Oct. 0.0392 0.0347 0.0371
09:01-10:00, Thu., 15 Oct. 0.0391 0.0352 0.0371
08:01-09:00, Thu., 15 Oct. 0.0385 0.0343 0.0365
07:01-08:00, Thu., 15 Oct. 0.0389 0.0342 0.0369
06:01-07:00, Thu., 15 Oct. 0.0392 0.0352 0.0369
05:01-06:00, Thu., 15 Oct. 0.0392 0.0349 0.0369
04:01-05:00, Thu., 15 Oct. 0.0391 0.0341 0.0369
03:01-04:00, Thu., 15 Oct. 0.0395 0.0344 0.0370
02:01-03:00, Thu., 15 Oct. 0.0382 0.0350 0.0370
01:01-02:00, Thu., 15 Oct. 0.0388 0.0346 0.0370
00:01-01:00, Thu., 15 Oct. 0.0396 0.0349 0.0370
23:01-24:00, Wed., 14 Oct. 0.0391 0.0345 0.0370
22:01-23:00, Wed., 14 Oct. 0.0391 0.0352 0.0370
21:01-22:00, Wed., 14 Oct. 0.0391 0.0353 0.0369
20:01-21:00, Wed., 14 Oct. 0.0392 0.0346 0.0370
19:01-20:00, Wed., 14 Oct. 0.0395 0.0350 0.0369
18:01-19:00, Wed., 14 Oct. 0.0393 0.0350 0.0368
17:01-18:00, Wed., 14 Oct. 0.0392 0.0353 0.0367
16:01-17:00, Wed., 14 Oct. 0.0396 0.0343 0.0369
15:01-16:00, Wed., 14 Oct. 0.0393 0.0345 0.0372
14:01-15:00, Wed., 14 Oct. 0.0418 0.0364 0.0386
13:01-14:00, Wed., 14 Oct. 0.0447 0.0375 0.0414
12:01-13:00, Wed., 14 Oct. 0.0460 0.0358 0.0400
11:01-12:00, Wed., 14 Oct. 0.0395 0.0341 0.0368
10:01-11:00, Wed., 14 Oct. 0.0383 0.0339 0.0365
09:01-10:00, Wed., 14 Oct. 0.0393 0.0343 0.0367
08:01-09:00, Wed., 14 Oct. 0.0395 0.0341 0.0367
07:01-08:00, Wed., 14 Oct. 0.0391 0.0350 0.0370
06:01-07:00, Wed., 14 Oct. 0.0391 0.0336 0.0367
05:01-06:00, Wed., 14 Oct. 0.0391 0.0340 0.0366
04:01-05:00, Wed., 14 Oct. 0.0385 0.0347 0.0366
03:01-04:00, Wed., 14 Oct. 0.0388 0.0341 0.0366
02:01-03:00, Wed., 14 Oct. 0.0397 0.0344 0.0367
01:01-02:00, Wed., 14 Oct. 0.0390 0.0350 0.0368
00:01-01:00, Wed., 14 Oct. 0.0388 0.0346 0.0365
23:01-24:00, Tue., 13 Oct. 0.0383 0.0346 0.0367
22:01-23:00, Tue., 13 Oct. 0.0386 0.0343 0.0365
21:01-22:00, Tue., 13 Oct. 0.0385 0.0350 0.0366
20:01-21:00, Tue., 13 Oct. 0.0388 0.0343 0.0365
19:01-20:00, Tue., 13 Oct. 0.0391 0.0346 0.0365
18:01-19:00, Tue., 13 Oct. 0.0384 0.0340 0.0365
17:01-18:00, Tue., 13 Oct. 0.0391 0.0346 0.0368
16:01-17:00, Tue., 13 Oct. 0.0395 0.0349 0.0370
15:01-16:00, Tue., 13 Oct. 0.0389 0.0349 0.0368
14:01-15:00, Tue., 13 Oct. 0.0396 0.0350 0.0368
13:01-14:00, Tue., 13 Oct. 0.0391 0.0350 0.0368
12:01-13:00, Tue., 13 Oct. 0.0384 0.0345 0.0367
11:01-12:00, Tue., 13 Oct. 0.0388 0.0347 0.0365
10:01-11:00, Tue., 13 Oct. 0.0381 0.0340 0.0364
09:01-10:00, Tue., 13 Oct. 0.0395 0.0340 0.0367
08:01-09:00, Tue., 13 Oct. 0.0395 0.0356 0.0375
07:01-08:00, Tue., 13 Oct. 0.0398 0.0347 0.0370
06:01-07:00, Tue., 13 Oct. 0.0398 0.0357 0.0373
05:01-06:00, Tue., 13 Oct. 0.0387 0.0350 0.0370
04:01-05:00, Tue., 13 Oct. 0.0386 0.0350 0.0370
03:01-04:00, Tue., 13 Oct. 0.0386 0.0351 0.0369
02:01-03:00, Tue., 13 Oct. 0.0386 0.0347 0.0368
01:01-02:00, Tue., 13 Oct. 0.0393 0.0351 0.0370
00:01-01:00, Tue., 13 Oct. 0.0386 0.0348 0.0368
23:01-24:00, Mon., 12 Oct. 0.0386 0.0340 0.0367
22:01-23:00, Mon., 12 Oct. 0.0388 0.0337 0.0366
21:01-22:00, Mon., 12 Oct. 0.0393 0.0345 0.0367
20:01-21:00, Mon., 12 Oct. 0.0390 0.0351 0.0368
19:01-20:00, Mon., 12 Oct. 0.0384 0.0346 0.0362
18:01-19:00, Mon., 12 Oct. 0.0398 0.0347 0.0370
17:01-18:00, Mon., 12 Oct. 0.0394 0.0344 0.0367
16:01-17:00, Mon., 12 Oct. 0.0390 0.0343 0.0367
15:01-16:00, Mon., 12 Oct. 0.0398 0.0349 0.0370
14:01-15:00, Mon., 12 Oct. 0.0388 0.0346 0.0369
13:01-14:00, Mon., 12 Oct. 0.0393 0.0336 0.0369
12:01-13:00, Mon., 12 Oct. 0.0402 0.0353 0.0371
11:01-12:00, Mon., 12 Oct. 0.0398 0.0349 0.0374
10:01-11:00, Mon., 12 Oct. 0.0387 0.0340 0.0368
09:01-10:00, Mon., 12 Oct. 0.0395 0.0350 0.0371
08:01-09:00, Mon., 12 Oct. 0.0391 0.0346 0.0370
07:01-08:00, Mon., 12 Oct. 0.0388 0.0350 0.0370
06:01-07:00, Mon., 12 Oct. 0.0391 0.0347 0.0368
05:01-06:00, Mon., 12 Oct. 0.0394 0.0347 0.0370
04:01-05:00, Mon., 12 Oct. 0.0388 0.0351 0.0369
03:01-04:00, Mon., 12 Oct. 0.0387 0.0343 0.0369
02:01-03:00, Mon., 12 Oct. 0.0388 0.0333 0.0367
01:01-02:00, Mon., 12 Oct. 0.0390 0.0348 0.0369
00:01-01:00, Mon., 12 Oct. 0.0389 0.0346 0.0367
23:01-24:00, Sun., 11 Oct. 0.0387 0.0340 0.0364
22:01-23:00, Sun., 11 Oct. 0.0388 0.0347 0.0368
21:01-22:00, Sun., 11 Oct. 0.0391 0.0342 0.0363
20:01-21:00, Sun., 11 Oct. 0.0388 0.0347 0.0368
19:01-20:00, Sun., 11 Oct. 0.0387 0.0343 0.0364
18:01-19:00, Sun., 11 Oct. 0.0390 0.0340 0.0365
17:01-18:00, Sun., 11 Oct. 0.0384 0.0348 0.0370
16:01-17:00, Sun., 11 Oct. 0.0392 0.0347 0.0371
15:01-16:00, Sun., 11 Oct. 0.0398 0.0350 0.0371
14:01-15:00, Sun., 11 Oct. 0.0394 0.0352 0.0372
13:01-14:00, Sun., 11 Oct. 0.0395 0.0353 0.0372
12:01-13:00, Sun., 11 Oct. 0.0394 0.0355 0.0371
11:01-12:00, Sun., 11 Oct. 0.0397 0.0343 0.0367
10:01-11:00, Sun., 11 Oct. 0.0395 0.0346 0.0368
09:01-10:00, Sun., 11 Oct. 0.0390 0.0344 0.0370
08:01-09:00, Sun., 11 Oct. 0.0394 0.0346 0.0371
07:01-08:00, Sun., 11 Oct. 0.0396 0.0348 0.0373
06:01-07:00, Sun., 11 Oct. 0.0397 0.0356 0.0371
05:01-06:00, Sun., 11 Oct. 0.0400 0.0346 0.0370
04:01-05:00, Sun., 11 Oct. 0.0393 0.0346 0.0371
03:01-04:00, Sun., 11 Oct. 0.0388 0.0351 0.0368
02:01-03:00, Sun., 11 Oct. 0.0395 0.0349 0.0368
01:01-02:00, Sun., 11 Oct. 0.0385 0.0343 0.0366
00:01-01:00, Sun., 11 Oct. 0.0388 0.0348 0.0368
23:01-24:00, Sat., 10 Oct. 0.0391 0.0350 0.0369
22:01-23:00, Sat., 10 Oct. 0.0382 0.0343 0.0365
21:01-22:00, Sat., 10 Oct. 0.0386 0.0343 0.0365
20:01-21:00, Sat., 10 Oct. 0.0391 0.0335 0.0365
19:01-20:00, Sat., 10 Oct. 0.0393 0.0341 0.0365
18:01-19:00, Sat., 10 Oct. 0.0381 0.0341 0.0365
17:01-18:00, Sat., 10 Oct. 0.0386 0.0328 0.0365
16:01-17:00, Sat., 10 Oct. 0.0390 0.0343 0.0367
15:01-16:00, Sat., 10 Oct. 0.0387 0.0351 0.0370
14:01-15:00, Sat., 10 Oct. 0.0384 0.0347 0.0370
13:01-14:00, Sat., 10 Oct. 0.0388 0.0347 0.0370
12:01-13:00, Sat., 10 Oct. 0.0389 0.0348 0.0368
11:01-12:00, Sat., 10 Oct. 0.0402 0.0347 0.0367
10:01-11:00, Sat., 10 Oct. 0.0392 0.0349 0.0369
09:01-10:00, Sat., 10 Oct. 0.0384 0.0340 0.0366
08:01-09:00, Sat., 10 Oct. 0.0384 0.0348 0.0365
07:01-08:00, Sat., 10 Oct. 0.0395 0.0336 0.0366
06:01-07:00, Sat., 10 Oct. 0.0386 0.0346 0.0367
05:01-06:00, Sat., 10 Oct. 0.0397 0.0345 0.0367
04:01-05:00, Sat., 10 Oct. 0.0386 0.0347 0.0366
03:01-04:00, Sat., 10 Oct. 0.0402 0.0344 0.0369
02:01-03:00, Sat., 10 Oct. 0.0399 0.0347 0.0367
01:01-02:00, Sat., 10 Oct. 0.0391 0.0343 0.0367
00:01-01:00, Sat., 10 Oct. 0.0384 0.0350 0.0366
23:01-24:00, Fri., 09 Oct. 0.0390 0.0343 0.0369
22:01-23:00, Fri., 09 Oct. 0.0388 0.0338 0.0365
21:01-22:00, Fri., 09 Oct. 0.0379 0.0340 0.0365
20:01-21:00, Fri., 09 Oct. 0.0396 0.0346 0.0366
19:01-20:00, Fri., 09 Oct. 0.0385 0.0336 0.0364
18:01-19:00, Fri., 09 Oct. 0.0383 0.0338 0.0361
17:01-18:00, Fri., 09 Oct. 0.0382 0.0349 0.0365
16:01-17:00, Fri., 09 Oct. 0.0388 0.0343 0.0367
15:01-16:00, Fri., 09 Oct. 0.0389 0.0340 0.0367
14:01-15:00, Fri., 09 Oct. 0.0388 0.0344 0.0369
13:01-14:00, Fri., 09 Oct. 0.0400 0.0343 0.0365
12:01-13:00, Fri., 09 Oct. 0.0387 0.0343 0.0369
11:01-12:00, Fri., 09 Oct. 0.0381 0.0343 0.0364
10:01-11:00, Fri., 09 Oct. 0.0385 0.0343 0.0365
09:01-10:00, Fri., 09 Oct. 0.0381 0.0348 0.0366
08:01-09:00, Fri., 09 Oct. 0.0383 0.0351 0.0367
07:01-08:00, Fri., 09 Oct. 0.0389 0.0341 0.0368
06:01-07:00, Fri., 09 Oct. 0.0384 0.0345 0.0364
05:01-06:00, Fri., 09 Oct. 0.0387 0.0347 0.0366
04:01-05:00, Fri., 09 Oct. 0.0383 0.0344 0.0365
03:01-04:00, Fri., 09 Oct. 0.0397 0.0348 0.0367
02:01-03:00, Fri., 09 Oct. 0.0393 0.0343 0.0367
01:01-02:00, Fri., 09 Oct. 0.0380 0.0347 0.0364
00:01-01:00, Fri., 09 Oct. 0.0384 0.0346 0.0364
23:01-24:00, Thu., 08 Oct. 0.0382 0.0338 0.0365
22:01-23:00, Thu., 08 Oct. 0.0390 0.0351 0.0365
21:01-22:00, Thu., 08 Oct. 0.0398 0.0349 0.0363
20:01-21:00, Thu., 08 Oct. 0.0381 0.0336 0.0363
19:01-20:00, Thu., 08 Oct. 0.0387 0.0338 0.0364
18:01-19:00, Thu., 08 Oct. 0.0384 0.0335 0.0364
17:01-18:00, Thu., 08 Oct. 0.0412 0.0343 0.0375
16:01-17:00, Thu., 08 Oct. 0.0404 0.0345 0.0368
15:01-16:00, Thu., 08 Oct. 0.0402 0.0342 0.0373
14:01-15:00, Thu., 08 Oct. 0.0409 0.0347 0.0372
13:01-14:00, Thu., 08 Oct. 0.0411 0.0350 0.0387
12:01-13:00, Thu., 08 Oct. 0.0388 0.0343 0.0366
11:01-12:00, Thu., 08 Oct. 0.0413 0.0355 0.0381
10:01-11:00, Thu., 08 Oct. 0.0407 0.0360 0.0384
09:01-10:00, Thu., 08 Oct. 0.0416 0.0363 0.0388
08:01-09:00, Thu., 08 Oct. 0.0386 0.0346 0.0367
07:01-08:00, Thu., 08 Oct. 0.0381 0.0345 0.0366
06:01-07:00, Thu., 08 Oct. 0.0394 0.0347 0.0369
05:01-06:00, Thu., 08 Oct. 0.0384 0.0342 0.0364
04:01-05:00, Thu., 08 Oct. 0.0391 0.0346 0.0365
03:01-04:00, Thu., 08 Oct. 0.0384 0.0343 0.0365
02:01-03:00, Thu., 08 Oct. 0.0381 0.0346 0.0364
01:01-02:00, Thu., 08 Oct. 0.0385 0.0345 0.0365
00:01-01:00, Thu., 08 Oct. 0.0392 0.0339 0.0366
23:01-24:00, Wed., 07 Oct. 0.0388 0.0344 0.0365
22:01-23:00, Wed., 07 Oct. 0.0386 0.0343 0.0364
21:01-22:00, Wed., 07 Oct. 0.0391 0.0343 0.0365
20:01-21:00, Wed., 07 Oct. 0.0387 0.0339 0.0366
19:01-20:00, Wed., 07 Oct. 0.0386 0.0340 0.0366
18:01-19:00, Wed., 07 Oct. 0.0395 0.0344 0.0362
17:01-18:00, Wed., 07 Oct. 0.0389 0.0340 0.0364
16:01-17:00, Wed., 07 Oct. 0.0382 0.0343 0.0363