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
12:01-13:00, Sat., 26 Apr. 0.0391 0.0350 0.0370
11:01-12:00, Sat., 26 Apr. 0.0386 0.0352 0.0369
10:01-11:00, Sat., 26 Apr. 0.0391 0.0350 0.0370
09:01-10:00, Sat., 26 Apr. 0.0397 0.0351 0.0370
08:01-09:00, Sat., 26 Apr. 0.0385 0.0348 0.0369
07:01-08:00, Sat., 26 Apr. 0.0390 0.0344 0.0367
06:01-07:00, Sat., 26 Apr. 0.0402 0.0344 0.0370
05:01-06:00, Sat., 26 Apr. 0.0392 0.0340 0.0370
04:01-05:00, Sat., 26 Apr. 0.0396 0.0344 0.0370
03:01-04:00, Sat., 26 Apr. 0.0398 0.0351 0.0369
02:01-03:00, Sat., 26 Apr. 0.0388 0.0347 0.0367
01:01-02:00, Sat., 26 Apr. 0.0391 0.0352 0.0370
00:01-01:00, Sat., 26 Apr. 0.0389 0.0343 0.0367
23:01-24:00, Fri., 25 Apr. 0.0389 0.0349 0.0367
22:01-23:00, Fri., 25 Apr. 0.0387 0.0347 0.0368
21:01-22:00, Fri., 25 Apr. 0.0408 0.0346 0.0367
20:01-21:00, Fri., 25 Apr. 0.0398 0.0346 0.0369
19:01-20:00, Fri., 25 Apr. 0.0400 0.0340 0.0369
18:01-19:00, Fri., 25 Apr. 0.0387 0.0350 0.0370
17:01-18:00, Fri., 25 Apr. 0.0382 0.0345 0.0369
16:01-17:00, Fri., 25 Apr. 0.0386 0.0339 0.0369
15:01-16:00, Fri., 25 Apr. 0.0396 0.0348 0.0369
14:01-15:00, Fri., 25 Apr. 0.0392 0.0351 0.0369
13:01-14:00, Fri., 25 Apr. 0.0391 0.0346 0.0369
12:01-13:00, Fri., 25 Apr. 0.0389 0.0347 0.0367
11:01-12:00, Fri., 25 Apr. 0.0387 0.0350 0.0369
10:01-11:00, Fri., 25 Apr. 0.0397 0.0353 0.0370
09:01-10:00, Fri., 25 Apr. 0.0384 0.0348 0.0368
08:01-09:00, Fri., 25 Apr. 0.0388 0.0349 0.0368
07:01-08:00, Fri., 25 Apr. 0.0387 0.0345 0.0370
06:01-07:00, Fri., 25 Apr. 0.0392 0.0353 0.0371
05:01-06:00, Fri., 25 Apr. 0.0387 0.0349 0.0368
04:01-05:00, Fri., 25 Apr. 0.0402 0.0348 0.0370
03:01-04:00, Fri., 25 Apr. 0.0399 0.0350 0.0371
02:01-03:00, Fri., 25 Apr. 0.0391 0.0348 0.0370
01:01-02:00, Fri., 25 Apr. 0.0393 0.0342 0.0371
00:01-01:00, Fri., 25 Apr. 0.0392 0.0353 0.0373
23:01-24:00, Thu., 24 Apr. 0.0391 0.0348 0.0365
22:01-23:00, Thu., 24 Apr. 0.0386 0.0349 0.0368
21:01-22:00, Thu., 24 Apr. 0.0407 0.0350 0.0368
20:01-21:00, Thu., 24 Apr. 0.0395 0.0353 0.0369
19:01-20:00, Thu., 24 Apr. 0.0388 0.0348 0.0371
18:01-19:00, Thu., 24 Apr. 0.0395 0.0349 0.0369
17:01-18:00, Thu., 24 Apr. 0.0387 0.0347 0.0366
16:01-17:00, Thu., 24 Apr. 0.0398 0.0343 0.0368
15:01-16:00, Thu., 24 Apr. 0.0391 0.0347 0.0370
14:01-15:00, Thu., 24 Apr. 0.0387 0.0343 0.0371
13:01-14:00, Thu., 24 Apr. 0.0388 0.0330 0.0369
12:01-13:00, Thu., 24 Apr. 0.0382 0.0340 0.0367
11:01-12:00, Thu., 24 Apr. 0.0386 0.0347 0.0368
10:01-11:00, Thu., 24 Apr. 0.0390 0.0341 0.0368
09:01-10:00, Thu., 24 Apr. 0.0387 0.0343 0.0367
08:01-09:00, Thu., 24 Apr. 0.0384 0.0353 0.0368
07:01-08:00, Thu., 24 Apr. 0.0395 0.0340 0.0367
06:01-07:00, Thu., 24 Apr. 0.0395 0.0347 0.0369
05:01-06:00, Thu., 24 Apr. 0.0397 0.0338 0.0368
04:01-05:00, Thu., 24 Apr. 0.0385 0.0351 0.0367
03:01-04:00, Thu., 24 Apr. 0.0388 0.0347 0.0367
02:01-03:00, Thu., 24 Apr. 0.0380 0.0340 0.0366
01:01-02:00, Thu., 24 Apr. 0.0390 0.0347 0.0365
00:01-01:00, Thu., 24 Apr. 0.0390 0.0336 0.0365
23:01-24:00, Wed., 23 Apr. 0.0383 0.0342 0.0365
22:01-23:00, Wed., 23 Apr. 0.0389 0.0350 0.0368
21:01-22:00, Wed., 23 Apr. 0.0383 0.0344 0.0364
20:01-21:00, Wed., 23 Apr. 0.0388 0.0343 0.0364
19:01-20:00, Wed., 23 Apr. 0.0382 0.0340 0.0365
18:01-19:00, Wed., 23 Apr. 0.0388 0.0346 0.0366
17:01-18:00, Wed., 23 Apr. 0.0391 0.0353 0.0371
16:01-17:00, Wed., 23 Apr. 0.0393 0.0351 0.0373
15:01-16:00, Wed., 23 Apr. 0.0398 0.0357 0.0375
14:01-15:00, Wed., 23 Apr. 0.0409 0.0369 0.0390
13:01-14:00, Wed., 23 Apr. 0.0412 0.0374 0.0394
12:01-13:00, Wed., 23 Apr. 0.0421 0.0359 0.0389
11:01-12:00, Wed., 23 Apr. 0.0409 0.0357 0.0386
10:01-11:00, Wed., 23 Apr. 0.0417 0.0367 0.0386
09:01-10:00, Wed., 23 Apr. 0.0398 0.0363 0.0381
08:01-09:00, Wed., 23 Apr. 0.0402 0.0357 0.0380
07:01-08:00, Wed., 23 Apr. 0.0400 0.0360 0.0378
06:01-07:00, Wed., 23 Apr. 0.0420 0.0367 0.0390
05:01-06:00, Wed., 23 Apr. 0.0450 0.0374 0.0405
04:01-05:00, Wed., 23 Apr. 0.0441 0.0395 0.0417
03:01-04:00, Wed., 23 Apr. 0.0462 0.0407 0.0433
02:01-03:00, Wed., 23 Apr. 0.0456 0.0370 0.0415
01:01-02:00, Wed., 23 Apr. 0.0412 0.0351 0.0379
00:01-01:00, Wed., 23 Apr. 0.0385 0.0350 0.0369
23:01-24:00, Tue., 22 Apr. 0.0402 0.0350 0.0369
22:01-23:00, Tue., 22 Apr. 0.0397 0.0353 0.0374
21:01-22:00, Tue., 22 Apr. 0.0396 0.0340 0.0372
20:01-21:00, Tue., 22 Apr. 0.0391 0.0346 0.0370
19:01-20:00, Tue., 22 Apr. 0.0391 0.0349 0.0371
18:01-19:00, Tue., 22 Apr. 0.0405 0.0347 0.0370
17:01-18:00, Tue., 22 Apr. 0.0385 0.0351 0.0370
16:01-17:00, Tue., 22 Apr. 0.0402 0.0353 0.0373
15:01-16:00, Tue., 22 Apr. 0.0395 0.0348 0.0369
14:01-15:00, Tue., 22 Apr. 0.0395 0.0341 0.0372
13:01-14:00, Tue., 22 Apr. 0.0398 0.0349 0.0369
12:01-13:00, Tue., 22 Apr. 0.0394 0.0356 0.0369
11:01-12:00, Tue., 22 Apr. 0.0398 0.0351 0.0370
10:01-11:00, Tue., 22 Apr. 0.0399 0.0355 0.0372
09:01-10:00, Tue., 22 Apr. 0.0392 0.0353 0.0372
08:01-09:00, Tue., 22 Apr. 0.0402 0.0353 0.0372
07:01-08:00, Tue., 22 Apr. 0.0393 0.0353 0.0373
06:01-07:00, Tue., 22 Apr. 0.0388 0.0355 0.0374
05:01-06:00, Tue., 22 Apr. 0.0396 0.0352 0.0372
04:01-05:00, Tue., 22 Apr. 0.0397 0.0343 0.0371
03:01-04:00, Tue., 22 Apr. 0.0397 0.0356 0.0374
02:01-03:00, Tue., 22 Apr. 0.0392 0.0352 0.0374
01:01-02:00, Tue., 22 Apr. 0.0394 0.0344 0.0372
00:01-01:00, Tue., 22 Apr. 0.0391 0.0341 0.0370
23:01-24:00, Mon., 21 Apr. 0.0398 0.0357 0.0374
22:01-23:00, Mon., 21 Apr. 0.0391 0.0348 0.0369
21:01-22:00, Mon., 21 Apr. 0.0387 0.0347 0.0369
20:01-21:00, Mon., 21 Apr. 0.0389 0.0340 0.0370
19:01-20:00, Mon., 21 Apr. 0.0396 0.0342 0.0371
18:01-19:00, Mon., 21 Apr. 0.0380 0.0341 0.0365
17:01-18:00, Mon., 21 Apr. 0.0386 0.0341 0.0369
16:01-17:00, Mon., 21 Apr. 0.0393 0.0350 0.0373
15:01-16:00, Mon., 21 Apr. 0.0389 0.0355 0.0374
14:01-15:00, Mon., 21 Apr. 0.0392 0.0347 0.0373
13:01-14:00, Mon., 21 Apr. 0.0398 0.0346 0.0372
12:01-13:00, Mon., 21 Apr. 0.0390 0.0353 0.0374
11:01-12:00, Mon., 21 Apr. 0.0392 0.0351 0.0371
10:01-11:00, Mon., 21 Apr. 0.0401 0.0353 0.0374
09:01-10:00, Mon., 21 Apr. 0.0402 0.0350 0.0371
08:01-09:00, Mon., 21 Apr. 0.0388 0.0350 0.0371
07:01-08:00, Mon., 21 Apr. 0.0389 0.0344 0.0370
06:01-07:00, Mon., 21 Apr. 0.0394 0.0347 0.0370
05:01-06:00, Mon., 21 Apr. 0.0400 0.0346 0.0372
04:01-05:00, Mon., 21 Apr. 0.0409 0.0350 0.0373
03:01-04:00, Mon., 21 Apr. 0.0400 0.0350 0.0371
02:01-03:00, Mon., 21 Apr. 0.0402 0.0335 0.0371
01:01-02:00, Mon., 21 Apr. 0.0394 0.0347 0.0371
00:01-01:00, Mon., 21 Apr. 0.0400 0.0348 0.0371
23:01-24:00, Sun., 20 Apr. 0.0393 0.0349 0.0371
22:01-23:00, Sun., 20 Apr. 0.0389 0.0351 0.0367
21:01-22:00, Sun., 20 Apr. 0.0395 0.0348 0.0368
20:01-21:00, Sun., 20 Apr. 0.0389 0.0341 0.0368
19:01-20:00, Sun., 20 Apr. 0.0397 0.0346 0.0369
18:01-19:00, Sun., 20 Apr. 0.0384 0.0340 0.0368
17:01-18:00, Sun., 20 Apr. 0.0390 0.0347 0.0368
16:01-17:00, Sun., 20 Apr. 0.0393 0.0347 0.0369
15:01-16:00, Sun., 20 Apr. 0.0387 0.0352 0.0366
14:01-15:00, Sun., 20 Apr. 0.0394 0.0349 0.0370
13:01-14:00, Sun., 20 Apr. 0.0389 0.0342 0.0371
12:01-13:00, Sun., 20 Apr. 0.0388 0.0344 0.0369
11:01-12:00, Sun., 20 Apr. 0.0392 0.0350 0.0368
10:01-11:00, Sun., 20 Apr. 0.0385 0.0346 0.0367
09:01-10:00, Sun., 20 Apr. 0.0389 0.0348 0.0367
08:01-09:00, Sun., 20 Apr. 0.0390 0.0350 0.0371
07:01-08:00, Sun., 20 Apr. 0.0391 0.0350 0.0370
06:01-07:00, Sun., 20 Apr. 0.0390 0.0347 0.0369
05:01-06:00, Sun., 20 Apr. 0.0391 0.0355 0.0371
04:01-05:00, Sun., 20 Apr. 0.0397 0.0353 0.0370
03:01-04:00, Sun., 20 Apr. 0.0391 0.0350 0.0368
02:01-03:00, Sun., 20 Apr. 0.0393 0.0345 0.0371
01:01-02:00, Sun., 20 Apr. 0.0395 0.0348 0.0369
00:01-01:00, Sun., 20 Apr. 0.0385 0.0337 0.0369
23:01-24:00, Sat., 19 Apr. 0.0387 0.0350 0.0369
22:01-23:00, Sat., 19 Apr. 0.0398 0.0349 0.0370
21:01-22:00, Sat., 19 Apr. 0.0391 0.0343 0.0370
20:01-21:00, Sat., 19 Apr. 0.0395 0.0346 0.0369
19:01-20:00, Sat., 19 Apr. 0.0398 0.0347 0.0370
18:01-19:00, Sat., 19 Apr. 0.0397 0.0350 0.0370
17:01-18:00, Sat., 19 Apr. 0.0391 0.0352 0.0370
16:01-17:00, Sat., 19 Apr. 0.0393 0.0350 0.0372
15:01-16:00, Sat., 19 Apr. 0.0393 0.0351 0.0371
14:01-15:00, Sat., 19 Apr. 0.0394 0.0353 0.0372
13:01-14:00, Sat., 19 Apr. 0.0393 0.0348 0.0371
12:01-13:00, Sat., 19 Apr. 0.0398 0.0350 0.0369
11:01-12:00, Sat., 19 Apr. 0.0390 0.0348 0.0370
10:01-11:00, Sat., 19 Apr. 0.0395 0.0352 0.0371
09:01-10:00, Sat., 19 Apr. 0.0387 0.0343 0.0369
08:01-09:00, Sat., 19 Apr. 0.0390 0.0344 0.0370
07:01-08:00, Sat., 19 Apr. 0.0396 0.0343 0.0370
06:01-07:00, Sat., 19 Apr. 0.0385 0.0338 0.0370
05:01-06:00, Sat., 19 Apr. 0.0396 0.0345 0.0370
04:01-05:00, Sat., 19 Apr. 0.0388 0.0351 0.0367
03:01-04:00, Sat., 19 Apr. 0.0398 0.0351 0.0368
02:01-03:00, Sat., 19 Apr. 0.0388 0.0350 0.0368
01:01-02:00, Sat., 19 Apr. 0.0389 0.0350 0.0368
00:01-01:00, Sat., 19 Apr. 0.0391 0.0354 0.0370
23:01-24:00, Fri., 18 Apr. 0.0390 0.0347 0.0369
22:01-23:00, Fri., 18 Apr. 0.0389 0.0342 0.0366
21:01-22:00, Fri., 18 Apr. 0.0393 0.0346 0.0368
20:01-21:00, Fri., 18 Apr. 0.0392 0.0340 0.0367
19:01-20:00, Fri., 18 Apr. 0.0388 0.0339 0.0367
18:01-19:00, Fri., 18 Apr. 0.0401 0.0338 0.0368
17:01-18:00, Fri., 18 Apr. 0.0386 0.0351 0.0367
16:01-17:00, Fri., 18 Apr. 0.0388 0.0348 0.0370
15:01-16:00, Fri., 18 Apr. 0.0389 0.0350 0.0368
14:01-15:00, Fri., 18 Apr. 0.0395 0.0347 0.0369
13:01-14:00, Fri., 18 Apr. 0.0388 0.0344 0.0369
12:01-13:00, Fri., 18 Apr. 0.0393 0.0347 0.0366
11:01-12:00, Fri., 18 Apr. 0.0385 0.0350 0.0367
10:01-11:00, Fri., 18 Apr. 0.0394 0.0341 0.0371
09:01-10:00, Fri., 18 Apr. 0.0395 0.0348 0.0372
08:01-09:00, Fri., 18 Apr. 0.0395 0.0343 0.0373
07:01-08:00, Fri., 18 Apr. 0.0396 0.0357 0.0375
06:01-07:00, Fri., 18 Apr. 0.0397 0.0351 0.0374
05:01-06:00, Fri., 18 Apr. 0.0391 0.0343 0.0373
04:01-05:00, Fri., 18 Apr. 0.0401 0.0357 0.0373
03:01-04:00, Fri., 18 Apr. 0.0390 0.0351 0.0369
02:01-03:00, Fri., 18 Apr. 0.0397 0.0348 0.0367
01:01-02:00, Fri., 18 Apr. 0.0395 0.0350 0.0369
00:01-01:00, Fri., 18 Apr. 0.0382 0.0350 0.0369
23:01-24:00, Thu., 17 Apr. 0.0389 0.0345 0.0368
22:01-23:00, Thu., 17 Apr. 0.0394 0.0343 0.0370
21:01-22:00, Thu., 17 Apr. 0.0397 0.0345 0.0368
20:01-21:00, Thu., 17 Apr. 0.0385 0.0346 0.0367
19:01-20:00, Thu., 17 Apr. 0.0391 0.0349 0.0370
18:01-19:00, Thu., 17 Apr. 0.0385 0.0348 0.0369
17:01-18:00, Thu., 17 Apr. 0.0398 0.0346 0.0371
16:01-17:00, Thu., 17 Apr. 0.0389 0.0345 0.0371
15:01-16:00, Thu., 17 Apr. 0.0384 0.0344 0.0369
14:01-15:00, Thu., 17 Apr. 0.0391 0.0341 0.0370
13:01-14:00, Thu., 17 Apr. 0.0390 0.0342 0.0370
12:01-13:00, Thu., 17 Apr. 0.0391 0.0348 0.0369
11:01-12:00, Thu., 17 Apr. 0.0388 0.0341 0.0368
10:01-11:00, Thu., 17 Apr. 0.0406 0.0351 0.0370
09:01-10:00, Thu., 17 Apr. 0.0395 0.0343 0.0369
08:01-09:00, Thu., 17 Apr. 0.0391 0.0355 0.0372
07:01-08:00, Thu., 17 Apr. 0.0393 0.0348 0.0372
06:01-07:00, Thu., 17 Apr. 0.0386 0.0342 0.0370
05:01-06:00, Thu., 17 Apr. 0.0390 0.0352 0.0369
04:01-05:00, Thu., 17 Apr. 0.0388 0.0343 0.0369
03:01-04:00, Thu., 17 Apr. 0.0387 0.0347 0.0368
02:01-03:00, Thu., 17 Apr. 0.0388 0.0342 0.0366
01:01-02:00, Thu., 17 Apr. 0.0391 0.0345 0.0369
00:01-01:00, Thu., 17 Apr. 0.0395 0.0349 0.0370
23:01-24:00, Wed., 16 Apr. 0.0392 0.0350 0.0369
22:01-23:00, Wed., 16 Apr. 0.0385 0.0349 0.0369
21:01-22:00, Wed., 16 Apr. 0.0385 0.0347 0.0368
20:01-21:00, Wed., 16 Apr. 0.0395 0.0349 0.0367
19:01-20:00, Wed., 16 Apr. 0.0388 0.0349 0.0367
18:01-19:00, Wed., 16 Apr. 0.0396 0.0350 0.0367
17:01-18:00, Wed., 16 Apr. 0.0391 0.0354 0.0371
16:01-17:00, Wed., 16 Apr. 0.0392 0.0350 0.0371
15:01-16:00, Wed., 16 Apr. 0.0392 0.0345 0.0373
14:01-15:00, Wed., 16 Apr. 0.0397 0.0347 0.0372
13:01-14:00, Wed., 16 Apr. 0.0404 0.0345 0.0371