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., 23 Feb. 0.0401 0.0356 0.0378
11:01-12:00, Sun., 23 Feb. 0.0395 0.0353 0.0377
10:01-11:00, Sun., 23 Feb. 0.0395 0.0350 0.0374
09:01-10:00, Sun., 23 Feb. 0.0394 0.0358 0.0376
08:01-09:00, Sun., 23 Feb. 0.0395 0.0357 0.0375
07:01-08:00, Sun., 23 Feb. 0.0405 0.0350 0.0376
06:01-07:00, Sun., 23 Feb. 0.0400 0.0357 0.0379
05:01-06:00, Sun., 23 Feb. 0.0401 0.0363 0.0376
04:01-05:00, Sun., 23 Feb. 0.0395 0.0364 0.0379
03:01-04:00, Sun., 23 Feb. 0.0395 0.0357 0.0377
02:01-03:00, Sun., 23 Feb. 0.0401 0.0352 0.0378
01:01-02:00, Sun., 23 Feb. 0.0395 0.0355 0.0378
00:01-01:00, Sun., 23 Feb. 0.0402 0.0358 0.0380
23:01-24:00, Sat., 22 Feb. 0.0397 0.0354 0.0376
22:01-23:00, Sat., 22 Feb. 0.0407 0.0350 0.0377
21:01-22:00, Sat., 22 Feb. 0.0401 0.0358 0.0376
20:01-21:00, Sat., 22 Feb. 0.0405 0.0350 0.0378
19:01-20:00, Sat., 22 Feb. 0.0400 0.0360 0.0379
18:01-19:00, Sat., 22 Feb. 0.0405 0.0350 0.0379
17:01-18:00, Sat., 22 Feb. 0.0397 0.0352 0.0376
16:01-17:00, Sat., 22 Feb. 0.0399 0.0360 0.0377
15:01-16:00, Sat., 22 Feb. 0.0393 0.0351 0.0375
14:01-15:00, Sat., 22 Feb. 0.0402 0.0357 0.0377
13:01-14:00, Sat., 22 Feb. 0.0404 0.0353 0.0379
12:01-13:00, Sat., 22 Feb. 0.0395 0.0353 0.0377
11:01-12:00, Sat., 22 Feb. 0.0397 0.0357 0.0377
10:01-11:00, Sat., 22 Feb. 0.0402 0.0353 0.0378
09:01-10:00, Sat., 22 Feb. 0.0395 0.0354 0.0376
08:01-09:00, Sat., 22 Feb. 0.0402 0.0357 0.0376
07:01-08:00, Sat., 22 Feb. 0.0395 0.0355 0.0377
06:01-07:00, Sat., 22 Feb. 0.0395 0.0341 0.0377
05:01-06:00, Sat., 22 Feb. 0.0401 0.0343 0.0377
04:01-05:00, Sat., 22 Feb. 0.0399 0.0360 0.0378
03:01-04:00, Sat., 22 Feb. 0.0399 0.0357 0.0377
02:01-03:00, Sat., 22 Feb. 0.0395 0.0350 0.0376
01:01-02:00, Sat., 22 Feb. 0.0398 0.0346 0.0377
00:01-01:00, Sat., 22 Feb. 0.0402 0.0352 0.0378
23:01-24:00, Fri., 21 Feb. 0.0398 0.0353 0.0375
22:01-23:00, Fri., 21 Feb. 0.0402 0.0344 0.0375
21:01-22:00, Fri., 21 Feb. 0.0401 0.0350 0.0377
20:01-21:00, Fri., 21 Feb. 0.0395 0.0351 0.0375
19:01-20:00, Fri., 21 Feb. 0.0405 0.0349 0.0374
18:01-19:00, Fri., 21 Feb. 0.0397 0.0359 0.0378
17:01-18:00, Fri., 21 Feb. 0.0394 0.0353 0.0376
16:01-17:00, Fri., 21 Feb. 0.0401 0.0359 0.0378
15:01-16:00, Fri., 21 Feb. 0.0394 0.0354 0.0374
14:01-15:00, Fri., 21 Feb. 0.0405 0.0354 0.0377
13:01-14:00, Fri., 21 Feb. 0.0404 0.0351 0.0375
12:01-13:00, Fri., 21 Feb. 0.0402 0.0353 0.0376
11:01-12:00, Fri., 21 Feb. 0.0395 0.0358 0.0376
10:01-11:00, Fri., 21 Feb. 0.0395 0.0355 0.0377
09:01-10:00, Fri., 21 Feb. 0.0391 0.0359 0.0377
08:01-09:00, Fri., 21 Feb. 0.0399 0.0347 0.0377
07:01-08:00, Fri., 21 Feb. 0.0398 0.0350 0.0377
06:01-07:00, Fri., 21 Feb. 0.0398 0.0354 0.0378
05:01-06:00, Fri., 21 Feb. 0.0398 0.0360 0.0377
04:01-05:00, Fri., 21 Feb. 0.0398 0.0351 0.0376
03:01-04:00, Fri., 21 Feb. 0.0396 0.0350 0.0376
02:01-03:00, Fri., 21 Feb. 0.0394 0.0357 0.0376
01:01-02:00, Fri., 21 Feb. 0.0392 0.0353 0.0377
00:01-01:00, Fri., 21 Feb. 0.0392 0.0351 0.0375
23:01-24:00, Thu., 20 Feb. 0.0400 0.0353 0.0375
22:01-23:00, Thu., 20 Feb. 0.0409 0.0357 0.0377
21:01-22:00, Thu., 20 Feb. 0.0395 0.0345 0.0375
20:01-21:00, Thu., 20 Feb. 0.0392 0.0357 0.0375
19:01-20:00, Thu., 20 Feb. 0.0401 0.0343 0.0376
18:01-19:00, Thu., 20 Feb. 0.0393 0.0351 0.0373
17:01-18:00, Thu., 20 Feb. 0.0391 0.0358 0.0375
16:01-17:00, Thu., 20 Feb. 0.0401 0.0350 0.0373
15:01-16:00, Thu., 20 Feb. 0.0402 0.0347 0.0374
14:01-15:00, Thu., 20 Feb. 0.0393 0.0350 0.0374
13:01-14:00, Thu., 20 Feb. 0.0404 0.0359 0.0376
12:01-13:00, Thu., 20 Feb. 0.0400 0.0356 0.0375
11:01-12:00, Thu., 20 Feb. 0.0395 0.0350 0.0374
10:01-11:00, Thu., 20 Feb. 0.0396 0.0351 0.0374
09:01-10:00, Thu., 20 Feb. 0.0388 0.0347 0.0372
08:01-09:00, Thu., 20 Feb. 0.0396 0.0348 0.0375
07:01-08:00, Thu., 20 Feb. 0.0395 0.0357 0.0376
06:01-07:00, Thu., 20 Feb. 0.0398 0.0362 0.0378
05:01-06:00, Thu., 20 Feb. 0.0399 0.0346 0.0377
04:01-05:00, Thu., 20 Feb. 0.0392 0.0351 0.0374
03:01-04:00, Thu., 20 Feb. 0.0403 0.0359 0.0377
02:01-03:00, Thu., 20 Feb. 0.0398 0.0357 0.0378
01:01-02:00, Thu., 20 Feb. 0.0409 0.0357 0.0377
00:01-01:00, Thu., 20 Feb. 0.0394 0.0353 0.0376
23:01-24:00, Wed., 19 Feb. 0.0397 0.0360 0.0377
22:01-23:00, Wed., 19 Feb. 0.0396 0.0355 0.0378
21:01-22:00, Wed., 19 Feb. 0.0394 0.0360 0.0376
20:01-21:00, Wed., 19 Feb. 0.0398 0.0350 0.0373
19:01-20:00, Wed., 19 Feb. 0.0396 0.0355 0.0376
18:01-19:00, Wed., 19 Feb. 0.0399 0.0360 0.0376
17:01-18:00, Wed., 19 Feb. 0.0395 0.0358 0.0376
16:01-17:00, Wed., 19 Feb. 0.0395 0.0353 0.0373
15:01-16:00, Wed., 19 Feb. 0.0393 0.0362 0.0376
14:01-15:00, Wed., 19 Feb. 0.0396 0.0356 0.0375
13:01-14:00, Wed., 19 Feb. 0.0399 0.0348 0.0376
12:01-13:00, Wed., 19 Feb. 0.0395 0.0355 0.0377
11:01-12:00, Wed., 19 Feb. 0.0398 0.0353 0.0374
10:01-11:00, Wed., 19 Feb. 0.0395 0.0357 0.0376
09:01-10:00, Wed., 19 Feb. 0.0398 0.0358 0.0376
08:01-09:00, Wed., 19 Feb. 0.0396 0.0353 0.0377
07:01-08:00, Wed., 19 Feb. 0.0399 0.0353 0.0379
06:01-07:00, Wed., 19 Feb. 0.0409 0.0357 0.0378
05:01-06:00, Wed., 19 Feb. 0.0403 0.0360 0.0378
04:01-05:00, Wed., 19 Feb. 0.0405 0.0360 0.0380
03:01-04:00, Wed., 19 Feb. 0.0400 0.0363 0.0380
02:01-03:00, Wed., 19 Feb. 0.0397 0.0363 0.0379
01:01-02:00, Wed., 19 Feb. 0.0405 0.0353 0.0378
00:01-01:00, Wed., 19 Feb. 0.0395 0.0361 0.0379
23:01-24:00, Tue., 18 Feb. 0.0393 0.0361 0.0379
22:01-23:00, Tue., 18 Feb. 0.0398 0.0361 0.0379
21:01-22:00, Tue., 18 Feb. 0.0405 0.0356 0.0377
20:01-21:00, Tue., 18 Feb. 0.0395 0.0357 0.0375
19:01-20:00, Tue., 18 Feb. 0.0396 0.0359 0.0377
18:01-19:00, Tue., 18 Feb. 0.0392 0.0356 0.0376
17:01-18:00, Tue., 18 Feb. 0.0404 0.0353 0.0375
16:01-17:00, Tue., 18 Feb. 0.0395 0.0355 0.0376
15:01-16:00, Tue., 18 Feb. 0.0397 0.0347 0.0378
14:01-15:00, Tue., 18 Feb. 0.0398 0.0353 0.0377
13:01-14:00, Tue., 18 Feb. 0.0401 0.0346 0.0377
12:01-13:00, Tue., 18 Feb. 0.0404 0.0360 0.0378
11:01-12:00, Tue., 18 Feb. 0.0406 0.0355 0.0376
10:01-11:00, Tue., 18 Feb. 0.0392 0.0353 0.0377
09:01-10:00, Tue., 18 Feb. 0.0398 0.0356 0.0378
08:01-09:00, Tue., 18 Feb. 0.0397 0.0356 0.0378
07:01-08:00, Tue., 18 Feb. 0.0394 0.0360 0.0380
06:01-07:00, Tue., 18 Feb. 0.0405 0.0364 0.0380
05:01-06:00, Tue., 18 Feb. 0.0401 0.0360 0.0380
04:01-05:00, Tue., 18 Feb. 0.0415 0.0359 0.0381
03:01-04:00, Tue., 18 Feb. 0.0399 0.0357 0.0380
02:01-03:00, Tue., 18 Feb. 0.0401 0.0366 0.0383
01:01-02:00, Tue., 18 Feb. 0.0413 0.0366 0.0383
00:01-01:00, Tue., 18 Feb. 0.0405 0.0360 0.0382
23:01-24:00, Mon., 17 Feb. 0.0410 0.0352 0.0382
22:01-23:00, Mon., 17 Feb. 0.0404 0.0360 0.0380
21:01-22:00, Mon., 17 Feb. 0.0405 0.0352 0.0380
20:01-21:00, Mon., 17 Feb. 0.0405 0.0356 0.0378
19:01-20:00, Mon., 17 Feb. 0.0405 0.0357 0.0382
18:01-19:00, Mon., 17 Feb. 0.0402 0.0362 0.0380
17:01-18:00, Mon., 17 Feb. 0.0408 0.0366 0.0381
16:01-17:00, Mon., 17 Feb. 0.0412 0.0360 0.0386
15:01-16:00, Mon., 17 Feb. 0.0438 0.0380 0.0407
14:01-15:00, Mon., 17 Feb. 0.0475 0.0416 0.0445
13:01-14:00, Mon., 17 Feb. 0.0430 0.0356 0.0384
12:01-13:00, Mon., 17 Feb. 0.0398 0.0357 0.0376
11:01-12:00, Mon., 17 Feb. 0.0393 0.0348 0.0376
10:01-11:00, Mon., 17 Feb. 0.0395 0.0360 0.0376
09:01-10:00, Mon., 17 Feb. 0.0402 0.0350 0.0378
08:01-09:00, Mon., 17 Feb. 0.0399 0.0352 0.0378
07:01-08:00, Mon., 17 Feb. 0.0409 0.0364 0.0381
06:01-07:00, Mon., 17 Feb. 0.0405 0.0357 0.0378
05:01-06:00, Mon., 17 Feb. 0.0395 0.0360 0.0378
04:01-05:00, Mon., 17 Feb. 0.0401 0.0364 0.0378
03:01-04:00, Mon., 17 Feb. 0.0392 0.0359 0.0379
02:01-03:00, Mon., 17 Feb. 0.0402 0.0361 0.0377
01:01-02:00, Mon., 17 Feb. 0.0400 0.0353 0.0375
00:01-01:00, Mon., 17 Feb. 0.0400 0.0352 0.0377
23:01-24:00, Sun., 16 Feb. 0.0398 0.0358 0.0376
22:01-23:00, Sun., 16 Feb. 0.0398 0.0358 0.0376
21:01-22:00, Sun., 16 Feb. 0.0401 0.0354 0.0373
20:01-21:00, Sun., 16 Feb. 0.0401 0.0348 0.0375
19:01-20:00, Sun., 16 Feb. 0.0398 0.0353 0.0374
18:01-19:00, Sun., 16 Feb. 0.0399 0.0350 0.0375
17:01-18:00, Sun., 16 Feb. 0.0401 0.0349 0.0375
16:01-17:00, Sun., 16 Feb. 0.0392 0.0348 0.0374
15:01-16:00, Sun., 16 Feb. 0.0393 0.0358 0.0375
14:01-15:00, Sun., 16 Feb. 0.0404 0.0353 0.0377
13:01-14:00, Sun., 16 Feb. 0.0402 0.0357 0.0377
12:01-13:00, Sun., 16 Feb. 0.0390 0.0350 0.0374
11:01-12:00, Sun., 16 Feb. 0.0395 0.0355 0.0376
10:01-11:00, Sun., 16 Feb. 0.0412 0.0345 0.0378
09:01-10:00, Sun., 16 Feb. 0.0405 0.0357 0.0378
08:01-09:00, Sun., 16 Feb. 0.0405 0.0360 0.0377
07:01-08:00, Sun., 16 Feb. 0.0394 0.0360 0.0380
06:01-07:00, Sun., 16 Feb. 0.0409 0.0360 0.0377
05:01-06:00, Sun., 16 Feb. 0.0400 0.0361 0.0380
04:01-05:00, Sun., 16 Feb. 0.0397 0.0353 0.0376
03:01-04:00, Sun., 16 Feb. 0.0396 0.0353 0.0376
02:01-03:00, Sun., 16 Feb. 0.0401 0.0357 0.0376
01:01-02:00, Sun., 16 Feb. 0.0396 0.0351 0.0375
00:01-01:00, Sun., 16 Feb. 0.0405 0.0355 0.0376
23:01-24:00, Sat., 15 Feb. 0.0400 0.0353 0.0376
22:01-23:00, Sat., 15 Feb. 0.0395 0.0350 0.0375
21:01-22:00, Sat., 15 Feb. 0.0401 0.0345 0.0373
20:01-21:00, Sat., 15 Feb. 0.0396 0.0349 0.0375
19:01-20:00, Sat., 15 Feb. 0.0408 0.0351 0.0375
18:01-19:00, Sat., 15 Feb. 0.0402 0.0353 0.0375
17:01-18:00, Sat., 15 Feb. 0.0393 0.0355 0.0374
16:01-17:00, Sat., 15 Feb. 0.0396 0.0348 0.0374
15:01-16:00, Sat., 15 Feb. 0.0396 0.0357 0.0374
14:01-15:00, Sat., 15 Feb. 0.0392 0.0350 0.0374
13:01-14:00, Sat., 15 Feb. 0.0397 0.0351 0.0376
12:01-13:00, Sat., 15 Feb. 0.0400 0.0349 0.0374
11:01-12:00, Sat., 15 Feb. 0.0400 0.0360 0.0378
10:01-11:00, Sat., 15 Feb. 0.0400 0.0357 0.0375
09:01-10:00, Sat., 15 Feb. 0.0399 0.0352 0.0378
08:01-09:00, Sat., 15 Feb. 0.0391 0.0354 0.0374
07:01-08:00, Sat., 15 Feb. 0.0398 0.0357 0.0375
06:01-07:00, Sat., 15 Feb. 0.0398 0.0360 0.0377
05:01-06:00, Sat., 15 Feb. 0.0401 0.0353 0.0379
04:01-05:00, Sat., 15 Feb. 0.0402 0.0353 0.0377
03:01-04:00, Sat., 15 Feb. 0.0396 0.0354 0.0375
02:01-03:00, Sat., 15 Feb. 0.0394 0.0350 0.0375
01:01-02:00, Sat., 15 Feb. 0.0391 0.0355 0.0374
00:01-01:00, Sat., 15 Feb. 0.0403 0.0358 0.0375
23:01-24:00, Fri., 14 Feb. 0.0395 0.0349 0.0375
22:01-23:00, Fri., 14 Feb. 0.0401 0.0347 0.0374
21:01-22:00, Fri., 14 Feb. 0.0399 0.0354 0.0375
20:01-21:00, Fri., 14 Feb. 0.0391 0.0353 0.0374
19:01-20:00, Fri., 14 Feb. 0.0392 0.0352 0.0372
18:01-19:00, Fri., 14 Feb. 0.0401 0.0351 0.0376
17:01-18:00, Fri., 14 Feb. 0.0396 0.0351 0.0374
16:01-17:00, Fri., 14 Feb. 0.0391 0.0355 0.0374
15:01-16:00, Fri., 14 Feb. 0.0392 0.0356 0.0374
14:01-15:00, Fri., 14 Feb. 0.0402 0.0357 0.0375
13:01-14:00, Fri., 14 Feb. 0.0398 0.0352 0.0377
12:01-13:00, Fri., 14 Feb. 0.0398 0.0347 0.0375
11:01-12:00, Fri., 14 Feb. 0.0405 0.0350 0.0376
10:01-11:00, Fri., 14 Feb. 0.0399 0.0357 0.0376
09:01-10:00, Fri., 14 Feb. 0.0395 0.0351 0.0380
08:01-09:00, Fri., 14 Feb. 0.0398 0.0363 0.0379
07:01-08:00, Fri., 14 Feb. 0.0392 0.0343 0.0377
06:01-07:00, Fri., 14 Feb. 0.0398 0.0360 0.0379
05:01-06:00, Fri., 14 Feb. 0.0398 0.0360 0.0378
04:01-05:00, Fri., 14 Feb. 0.0405 0.0357 0.0375
03:01-04:00, Fri., 14 Feb. 0.0396 0.0355 0.0376
02:01-03:00, Fri., 14 Feb. 0.0394 0.0355 0.0375
01:01-02:00, Fri., 14 Feb. 0.0399 0.0347 0.0375
00:01-01:00, Fri., 14 Feb. 0.0392 0.0351 0.0374
23:01-24:00, Thu., 13 Feb. 0.0401 0.0357 0.0375
22:01-23:00, Thu., 13 Feb. 0.0396 0.0358 0.0374
21:01-22:00, Thu., 13 Feb. 0.0397 0.0358 0.0377
20:01-21:00, Thu., 13 Feb. 0.0404 0.0355 0.0376
19:01-20:00, Thu., 13 Feb. 0.0394 0.0359 0.0376
18:01-19:00, Thu., 13 Feb. 0.0391 0.0360 0.0375
17:01-18:00, Thu., 13 Feb. 0.0399 0.0352 0.0377
16:01-17:00, Thu., 13 Feb. 0.0402 0.0354 0.0375
15:01-16:00, Thu., 13 Feb. 0.0397 0.0357 0.0377
14:01-15:00, Thu., 13 Feb. 0.0398 0.0358 0.0379
13:01-14:00, Thu., 13 Feb. 0.0399 0.0352 0.0378