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, Sun., 22 Dec. 0.0408 0.0360 0.0380
11:01-12:00, Sun., 22 Dec. 0.0395 0.0356 0.0377
10:01-11:00, Sun., 22 Dec. 0.0394 0.0350 0.0374
09:01-10:00, Sun., 22 Dec. 0.0397 0.0356 0.0376
08:01-09:00, Sun., 22 Dec. 0.0395 0.0355 0.0375
07:01-08:00, Sun., 22 Dec. 0.0391 0.0357 0.0377
06:01-07:00, Sun., 22 Dec. 0.0402 0.0356 0.0378
05:01-06:00, Sun., 22 Dec. 0.0400 0.0354 0.0378
04:01-05:00, Sun., 22 Dec. 0.0399 0.0353 0.0380
03:01-04:00, Sun., 22 Dec. 0.0402 0.0355 0.0379
02:01-03:00, Sun., 22 Dec. 0.0399 0.0350 0.0379
01:01-02:00, Sun., 22 Dec. 0.0404 0.0353 0.0377
00:01-01:00, Sun., 22 Dec. 0.0399 0.0337 0.0375
23:01-24:00, Sat., 21 Dec. 0.0391 0.0356 0.0373
22:01-23:00, Sat., 21 Dec. 0.0396 0.0343 0.0373
21:01-22:00, Sat., 21 Dec. 0.0400 0.0350 0.0375
20:01-21:00, Sat., 21 Dec. 0.0400 0.0350 0.0373
19:01-20:00, Sat., 21 Dec. 0.0392 0.0350 0.0373
18:01-19:00, Sat., 21 Dec. 0.0402 0.0347 0.0373
17:01-18:00, Sat., 21 Dec. 0.0399 0.0347 0.0374
16:01-17:00, Sat., 21 Dec. 0.0397 0.0349 0.0371
15:01-16:00, Sat., 21 Dec. 0.0392 0.0353 0.0372
14:01-15:00, Sat., 21 Dec. 0.0387 0.0352 0.0373
13:01-14:00, Sat., 21 Dec. 0.0398 0.0349 0.0371
12:01-13:00, Sat., 21 Dec. 0.0391 0.0355 0.0373
11:01-12:00, Sat., 21 Dec. 0.0397 0.0346 0.0372
10:01-11:00, Sat., 21 Dec. 0.0398 0.0355 0.0376
09:01-10:00, Sat., 21 Dec. 0.0397 0.0346 0.0374
08:01-09:00, Sat., 21 Dec. 0.0393 0.0353 0.0376
07:01-08:00, Sat., 21 Dec. 0.0395 0.0357 0.0379
06:01-07:00, Sat., 21 Dec. 0.0393 0.0358 0.0377
05:01-06:00, Sat., 21 Dec. 0.0391 0.0352 0.0375
04:01-05:00, Sat., 21 Dec. 0.0402 0.0344 0.0375
03:01-04:00, Sat., 21 Dec. 0.0395 0.0343 0.0372
02:01-03:00, Sat., 21 Dec. 0.0398 0.0357 0.0375
01:01-02:00, Sat., 21 Dec. 0.0391 0.0356 0.0377
00:01-01:00, Sat., 21 Dec. 0.0402 0.0355 0.0377
23:01-24:00, Fri., 20 Dec. 0.0395 0.0353 0.0374
22:01-23:00, Fri., 20 Dec. 0.0394 0.0347 0.0370
21:01-22:00, Fri., 20 Dec. 0.0392 0.0339 0.0372
20:01-21:00, Fri., 20 Dec. 0.0396 0.0347 0.0370
19:01-20:00, Fri., 20 Dec. 0.0387 0.0354 0.0371
18:01-19:00, Fri., 20 Dec. 0.0392 0.0352 0.0373
17:01-18:00, Fri., 20 Dec. 0.0393 0.0340 0.0372
16:01-17:00, Fri., 20 Dec. 0.0388 0.0351 0.0371
15:01-16:00, Fri., 20 Dec. 0.0393 0.0347 0.0371
14:01-15:00, Fri., 20 Dec. 0.0391 0.0353 0.0371
13:01-14:00, Fri., 20 Dec. 0.0393 0.0351 0.0373
12:01-13:00, Fri., 20 Dec. 0.0389 0.0357 0.0373
11:01-12:00, Fri., 20 Dec. 0.0395 0.0351 0.0372
10:01-11:00, Fri., 20 Dec. 0.0398 0.0355 0.0373
09:01-10:00, Fri., 20 Dec. 0.0396 0.0357 0.0374
08:01-09:00, Fri., 20 Dec. 0.0393 0.0357 0.0377
07:01-08:00, Fri., 20 Dec. 0.0405 0.0354 0.0375
06:01-07:00, Fri., 20 Dec. 0.0396 0.0351 0.0377
05:01-06:00, Fri., 20 Dec. 0.0404 0.0356 0.0376
04:01-05:00, Fri., 20 Dec. 0.0394 0.0354 0.0372
03:01-04:00, Fri., 20 Dec. 0.0401 0.0352 0.0373
02:01-03:00, Fri., 20 Dec. 0.0405 0.0356 0.0375
01:01-02:00, Fri., 20 Dec. 0.0399 0.0356 0.0372
00:01-01:00, Fri., 20 Dec. 0.0397 0.0347 0.0372
23:01-24:00, Thu., 19 Dec. 0.0392 0.0353 0.0373
22:01-23:00, Thu., 19 Dec. 0.0391 0.0343 0.0371
21:01-22:00, Thu., 19 Dec. 0.0410 0.0346 0.0372
20:01-21:00, Thu., 19 Dec. 0.0392 0.0346 0.0372
19:01-20:00, Thu., 19 Dec. 0.0405 0.0350 0.0371
18:01-19:00, Thu., 19 Dec. 0.0400 0.0347 0.0371
17:01-18:00, Thu., 19 Dec. 0.0405 0.0357 0.0374
16:01-17:00, Thu., 19 Dec. 0.0390 0.0340 0.0373
15:01-16:00, Thu., 19 Dec. 0.0396 0.0347 0.0372
14:01-15:00, Thu., 19 Dec. 0.0396 0.0354 0.0374
13:01-14:00, Thu., 19 Dec. 0.0399 0.0348 0.0375
12:01-13:00, Thu., 19 Dec. 0.0395 0.0352 0.0373
11:01-12:00, Thu., 19 Dec. 0.0395 0.0347 0.0374
10:01-11:00, Thu., 19 Dec. 0.0402 0.0359 0.0379
09:01-10:00, Thu., 19 Dec. 0.0411 0.0353 0.0377
08:01-09:00, Thu., 19 Dec. 0.0408 0.0365 0.0386
07:01-08:00, Thu., 19 Dec. 0.0408 0.0366 0.0385
06:01-07:00, Thu., 19 Dec. 0.0409 0.0357 0.0381
05:01-06:00, Thu., 19 Dec. 0.0404 0.0365 0.0384
04:01-05:00, Thu., 19 Dec. 0.0407 0.0367 0.0386
03:01-04:00, Thu., 19 Dec. 0.0397 0.0355 0.0377
02:01-03:00, Thu., 19 Dec. 0.0400 0.0355 0.0379
01:01-02:00, Thu., 19 Dec. 0.0406 0.0357 0.0377
00:01-01:00, Thu., 19 Dec. 0.0397 0.0361 0.0376
23:01-24:00, Wed., 18 Dec. 0.0394 0.0352 0.0374
22:01-23:00, Wed., 18 Dec. 0.0391 0.0351 0.0374
21:01-22:00, Wed., 18 Dec. 0.0390 0.0353 0.0373
20:01-21:00, Wed., 18 Dec. 0.0394 0.0352 0.0373
19:01-20:00, Wed., 18 Dec. 0.0399 0.0350 0.0373
18:01-19:00, Wed., 18 Dec. 0.0401 0.0350 0.0375
17:01-18:00, Wed., 18 Dec. 0.0394 0.0359 0.0377
16:01-17:00, Wed., 18 Dec. 0.0398 0.0353 0.0376
15:01-16:00, Wed., 18 Dec. 0.0393 0.0359 0.0374
14:01-15:00, Wed., 18 Dec. 0.0392 0.0350 0.0375
13:01-14:00, Wed., 18 Dec. 0.0398 0.0356 0.0375
12:01-13:00, Wed., 18 Dec. 0.0395 0.0361 0.0377
11:01-12:00, Wed., 18 Dec. 0.0401 0.0353 0.0375
10:01-11:00, Wed., 18 Dec. 0.0402 0.0354 0.0376
09:01-10:00, Wed., 18 Dec. 0.0414 0.0350 0.0376
08:01-09:00, Wed., 18 Dec. 0.0400 0.0356 0.0380
07:01-08:00, Wed., 18 Dec. 0.0408 0.0358 0.0381
06:01-07:00, Wed., 18 Dec. 0.0399 0.0360 0.0381
05:01-06:00, Wed., 18 Dec. 0.0403 0.0358 0.0379
04:01-05:00, Wed., 18 Dec. 0.0393 0.0354 0.0378
03:01-04:00, Wed., 18 Dec. 0.0395 0.0340 0.0378
02:01-03:00, Wed., 18 Dec. 0.0401 0.0361 0.0377
01:01-02:00, Wed., 18 Dec. 0.0399 0.0351 0.0377
00:01-01:00, Wed., 18 Dec. 0.0396 0.0356 0.0375
23:01-24:00, Tue., 17 Dec. 0.0394 0.0356 0.0377
22:01-23:00, Tue., 17 Dec. 0.0401 0.0354 0.0377
21:01-22:00, Tue., 17 Dec. 0.0398 0.0360 0.0375
20:01-21:00, Tue., 17 Dec. 0.0395 0.0343 0.0372
19:01-20:00, Tue., 17 Dec. 0.0394 0.0344 0.0372
18:01-19:00, Tue., 17 Dec. 0.0395 0.0357 0.0375
17:01-18:00, Tue., 17 Dec. 0.0399 0.0357 0.0374
16:01-17:00, Tue., 17 Dec. 0.0395 0.0347 0.0374
15:01-16:00, Tue., 17 Dec. 0.0389 0.0355 0.0373
14:01-15:00, Tue., 17 Dec. 0.0395 0.0351 0.0375
13:01-14:00, Tue., 17 Dec. 0.0402 0.0358 0.0372
12:01-13:00, Tue., 17 Dec. 0.0394 0.0358 0.0375
11:01-12:00, Tue., 17 Dec. 0.0408 0.0354 0.0379
10:01-11:00, Tue., 17 Dec. 0.0402 0.0357 0.0382
09:01-10:00, Tue., 17 Dec. 0.0403 0.0363 0.0382
08:01-09:00, Tue., 17 Dec. 0.0405 0.0354 0.0382
07:01-08:00, Tue., 17 Dec. 0.0400 0.0355 0.0381
06:01-07:00, Tue., 17 Dec. 0.0397 0.0353 0.0379
05:01-06:00, Tue., 17 Dec. 0.0395 0.0353 0.0379
04:01-05:00, Tue., 17 Dec. 0.0399 0.0357 0.0377
03:01-04:00, Tue., 17 Dec. 0.0401 0.0357 0.0378
02:01-03:00, Tue., 17 Dec. 0.0409 0.0360 0.0381
01:01-02:00, Tue., 17 Dec. 0.0404 0.0358 0.0378
00:01-01:00, Tue., 17 Dec. 0.0395 0.0359 0.0379
23:01-24:00, Mon., 16 Dec. 0.0402 0.0346 0.0375
22:01-23:00, Mon., 16 Dec. 0.0400 0.0356 0.0375
21:01-22:00, Mon., 16 Dec. 0.0405 0.0347 0.0374
20:01-21:00, Mon., 16 Dec. 0.0398 0.0346 0.0372
19:01-20:00, Mon., 16 Dec. 0.0399 0.0350 0.0374
18:01-19:00, Mon., 16 Dec. 0.0395 0.0353 0.0374
17:01-18:00, Mon., 16 Dec. 0.0402 0.0352 0.0374
16:01-17:00, Mon., 16 Dec. 0.0395 0.0360 0.0375
15:01-16:00, Mon., 16 Dec. 0.0410 0.0349 0.0373
14:01-15:00, Mon., 16 Dec. 0.0396 0.0352 0.0375
13:01-14:00, Mon., 16 Dec. 0.0397 0.0347 0.0370
12:01-13:00, Mon., 16 Dec. 0.0394 0.0349 0.0374
11:01-12:00, Mon., 16 Dec. 0.0398 0.0348 0.0373
10:01-11:00, Mon., 16 Dec. 0.0400 0.0354 0.0378
09:01-10:00, Mon., 16 Dec. 0.0396 0.0357 0.0376
08:01-09:00, Mon., 16 Dec. 0.0398 0.0351 0.0375
07:01-08:00, Mon., 16 Dec. 0.0401 0.0353 0.0379
06:01-07:00, Mon., 16 Dec. 0.0410 0.0350 0.0376
05:01-06:00, Mon., 16 Dec. 0.0398 0.0361 0.0379
04:01-05:00, Mon., 16 Dec. 0.0402 0.0357 0.0374
03:01-04:00, Mon., 16 Dec. 0.0394 0.0346 0.0372
02:01-03:00, Mon., 16 Dec. 0.0398 0.0351 0.0376
01:01-02:00, Mon., 16 Dec. 0.0408 0.0355 0.0376
00:01-01:00, Mon., 16 Dec. 0.0395 0.0359 0.0377
23:01-24:00, Sun., 15 Dec. 0.0400 0.0357 0.0376
22:01-23:00, Sun., 15 Dec. 0.0398 0.0360 0.0378
21:01-22:00, Sun., 15 Dec. 0.0398 0.0354 0.0374
20:01-21:00, Sun., 15 Dec. 0.0402 0.0354 0.0375
19:01-20:00, Sun., 15 Dec. 0.0392 0.0358 0.0375
18:01-19:00, Sun., 15 Dec. 0.0391 0.0352 0.0374
17:01-18:00, Sun., 15 Dec. 0.0394 0.0353 0.0375
16:01-17:00, Sun., 15 Dec. 0.0395 0.0347 0.0373
15:01-16:00, Sun., 15 Dec. 0.0398 0.0353 0.0377
14:01-15:00, Sun., 15 Dec. 0.0389 0.0349 0.0373
13:01-14:00, Sun., 15 Dec. 0.0399 0.0355 0.0375
12:01-13:00, Sun., 15 Dec. 0.0395 0.0354 0.0375
11:01-12:00, Sun., 15 Dec. 0.0400 0.0355 0.0375
10:01-11:00, Sun., 15 Dec. 0.0390 0.0347 0.0373
09:01-10:00, Sun., 15 Dec. 0.0395 0.0358 0.0375
08:01-09:00, Sun., 15 Dec. 0.0393 0.0352 0.0372
07:01-08:00, Sun., 15 Dec. 0.0392 0.0360 0.0374
06:01-07:00, Sun., 15 Dec. 0.0394 0.0349 0.0375
05:01-06:00, Sun., 15 Dec. 0.0395 0.0347 0.0373
04:01-05:00, Sun., 15 Dec. 0.0401 0.0345 0.0374
03:01-04:00, Sun., 15 Dec. 0.0397 0.0353 0.0375
02:01-03:00, Sun., 15 Dec. 0.0405 0.0357 0.0374
01:01-02:00, Sun., 15 Dec. 0.0391 0.0351 0.0372
00:01-01:00, Sun., 15 Dec. 0.0394 0.0353 0.0374
23:01-24:00, Sat., 14 Dec. 0.0394 0.0353 0.0373
22:01-23:00, Sat., 14 Dec. 0.0393 0.0346 0.0370
21:01-22:00, Sat., 14 Dec. 0.0393 0.0357 0.0371
20:01-21:00, Sat., 14 Dec. 0.0394 0.0350 0.0370
19:01-20:00, Sat., 14 Dec. 0.0385 0.0353 0.0371
18:01-19:00, Sat., 14 Dec. 0.0397 0.0349 0.0371
17:01-18:00, Sat., 14 Dec. 0.0394 0.0350 0.0373
16:01-17:00, Sat., 14 Dec. 0.0394 0.0348 0.0370
15:01-16:00, Sat., 14 Dec. 0.0395 0.0350 0.0369
14:01-15:00, Sat., 14 Dec. 0.0401 0.0346 0.0369
13:01-14:00, Sat., 14 Dec. 0.0395 0.0338 0.0372
12:01-13:00, Sat., 14 Dec. 0.0391 0.0345 0.0372
11:01-12:00, Sat., 14 Dec. 0.0393 0.0352 0.0371
10:01-11:00, Sat., 14 Dec. 0.0393 0.0348 0.0373
09:01-10:00, Sat., 14 Dec. 0.0391 0.0356 0.0372
08:01-09:00, Sat., 14 Dec. 0.0396 0.0349 0.0371
07:01-08:00, Sat., 14 Dec. 0.0394 0.0352 0.0373
06:01-07:00, Sat., 14 Dec. 0.0398 0.0350 0.0376
05:01-06:00, Sat., 14 Dec. 0.0408 0.0355 0.0378
04:01-05:00, Sat., 14 Dec. 0.0397 0.0348 0.0378
03:01-04:00, Sat., 14 Dec. 0.0398 0.0361 0.0377
02:01-03:00, Sat., 14 Dec. 0.0396 0.0355 0.0376
01:01-02:00, Sat., 14 Dec. 0.0395 0.0357 0.0378
00:01-01:00, Sat., 14 Dec. 0.0404 0.0358 0.0383
23:01-24:00, Fri., 13 Dec. 0.0393 0.0351 0.0374
22:01-23:00, Fri., 13 Dec. 0.0398 0.0356 0.0374
21:01-22:00, Fri., 13 Dec. 0.0407 0.0356 0.0378
20:01-21:00, Fri., 13 Dec. 0.0400 0.0350 0.0373
19:01-20:00, Fri., 13 Dec. 0.0391 0.0360 0.0375
18:01-19:00, Fri., 13 Dec. 0.0395 0.0351 0.0374
17:01-18:00, Fri., 13 Dec. 0.0388 0.0354 0.0370
16:01-17:00, Fri., 13 Dec. 0.0396 0.0342 0.0372
15:01-16:00, Fri., 13 Dec. 0.0394 0.0349 0.0373
14:01-15:00, Fri., 13 Dec. 0.0397 0.0350 0.0372
13:01-14:00, Fri., 13 Dec. 0.0392 0.0353 0.0376
12:01-13:00, Fri., 13 Dec. 0.0392 0.0350 0.0375
11:01-12:00, Fri., 13 Dec. 0.0398 0.0347 0.0373
10:01-11:00, Fri., 13 Dec. 0.0395 0.0353 0.0370
09:01-10:00, Fri., 13 Dec. 0.0398 0.0344 0.0371
08:01-09:00, Fri., 13 Dec. 0.0384 0.0347 0.0372
07:01-08:00, Fri., 13 Dec. 0.0398 0.0350 0.0371
06:01-07:00, Fri., 13 Dec. 0.0393 0.0353 0.0371
05:01-06:00, Fri., 13 Dec. 0.0396 0.0351 0.0373
04:01-05:00, Fri., 13 Dec. 0.0393 0.0354 0.0374
03:01-04:00, Fri., 13 Dec. 0.0392 0.0349 0.0372
02:01-03:00, Fri., 13 Dec. 0.0398 0.0351 0.0372
01:01-02:00, Fri., 13 Dec. 0.0393 0.0353 0.0372
00:01-01:00, Fri., 13 Dec. 0.0399 0.0352 0.0375
23:01-24:00, Thu., 12 Dec. 0.0395 0.0340 0.0370
22:01-23:00, Thu., 12 Dec. 0.0388 0.0352 0.0370
21:01-22:00, Thu., 12 Dec. 0.0390 0.0353 0.0369
20:01-21:00, Thu., 12 Dec. 0.0397 0.0344 0.0370
19:01-20:00, Thu., 12 Dec. 0.0391 0.0350 0.0370
18:01-19:00, Thu., 12 Dec. 0.0398 0.0355 0.0374
17:01-18:00, Thu., 12 Dec. 0.0399 0.0350 0.0372
16:01-17:00, Thu., 12 Dec. 0.0386 0.0347 0.0370
15:01-16:00, Thu., 12 Dec. 0.0398 0.0348 0.0371
14:01-15:00, Thu., 12 Dec. 0.0391 0.0353 0.0371
13:01-14:00, Thu., 12 Dec. 0.0391 0.0347 0.0369