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
16:01-17:00, Mon., 18 Aug. 0.0389 0.0345 0.0369
15:01-16:00, Mon., 18 Aug. 0.0409 0.0349 0.0370
14:01-15:00, Mon., 18 Aug. 0.0392 0.0353 0.0370
13:01-14:00, Mon., 18 Aug. 0.0392 0.0347 0.0369
12:01-13:00, Mon., 18 Aug. 0.0398 0.0349 0.0372
11:01-12:00, Mon., 18 Aug. 0.0398 0.0360 0.0376
10:01-11:00, Mon., 18 Aug. 0.0402 0.0352 0.0374
09:01-10:00, Mon., 18 Aug. 0.0394 0.0354 0.0373
08:01-09:00, Mon., 18 Aug. 0.0390 0.0355 0.0373
07:01-08:00, Mon., 18 Aug. 0.0389 0.0352 0.0373
06:01-07:00, Mon., 18 Aug. 0.0393 0.0346 0.0369
05:01-06:00, Mon., 18 Aug. 0.0386 0.0347 0.0367
04:01-05:00, Mon., 18 Aug. 0.0398 0.0350 0.0369
03:01-04:00, Mon., 18 Aug. 0.0391 0.0354 0.0368
02:01-03:00, Mon., 18 Aug. 0.0402 0.0347 0.0371
01:01-02:00, Mon., 18 Aug. 0.0394 0.0347 0.0370
00:01-01:00, Mon., 18 Aug. 0.0384 0.0350 0.0369
23:01-24:00, Sun., 17 Aug. 0.0395 0.0344 0.0369
22:01-23:00, Sun., 17 Aug. 0.0388 0.0347 0.0370
21:01-22:00, Sun., 17 Aug. 0.0388 0.0349 0.0368
20:01-21:00, Sun., 17 Aug. 0.0392 0.0350 0.0369
19:01-20:00, Sun., 17 Aug. 0.0385 0.0348 0.0369
18:01-19:00, Sun., 17 Aug. 0.0394 0.0350 0.0368
17:01-18:00, Sun., 17 Aug. 0.0395 0.0342 0.0367
16:01-17:00, Sun., 17 Aug. 0.0398 0.0343 0.0366
15:01-16:00, Sun., 17 Aug. 0.0387 0.0350 0.0367
14:01-15:00, Sun., 17 Aug. 0.0397 0.0347 0.0370
13:01-14:00, Sun., 17 Aug. 0.0387 0.0347 0.0369
12:01-13:00, Sun., 17 Aug. 0.0389 0.0336 0.0370
11:01-12:00, Sun., 17 Aug. 0.0392 0.0348 0.0368
10:01-11:00, Sun., 17 Aug. 0.0393 0.0349 0.0370
09:01-10:00, Sun., 17 Aug. 0.0394 0.0349 0.0368
08:01-09:00, Sun., 17 Aug. 0.0388 0.0347 0.0367
07:01-08:00, Sun., 17 Aug. 0.0398 0.0343 0.0366
06:01-07:00, Sun., 17 Aug. 0.0387 0.0341 0.0366
05:01-06:00, Sun., 17 Aug. 0.0384 0.0342 0.0368
04:01-05:00, Sun., 17 Aug. 0.0398 0.0338 0.0367
03:01-04:00, Sun., 17 Aug. 0.0387 0.0343 0.0366
02:01-03:00, Sun., 17 Aug. 0.0384 0.0343 0.0363
01:01-02:00, Sun., 17 Aug. 0.0387 0.0347 0.0366
00:01-01:00, Sun., 17 Aug. 0.0388 0.0345 0.0364
23:01-24:00, Sat., 16 Aug. 0.0383 0.0347 0.0365
22:01-23:00, Sat., 16 Aug. 0.0386 0.0339 0.0367
21:01-22:00, Sat., 16 Aug. 0.0381 0.0346 0.0366
20:01-21:00, Sat., 16 Aug. 0.0395 0.0343 0.0368
19:01-20:00, Sat., 16 Aug. 0.0387 0.0343 0.0364
18:01-19:00, Sat., 16 Aug. 0.0381 0.0343 0.0364
17:01-18:00, Sat., 16 Aug. 0.0382 0.0348 0.0364
16:01-17:00, Sat., 16 Aug. 0.0395 0.0340 0.0368
15:01-16:00, Sat., 16 Aug. 0.0388 0.0347 0.0369
14:01-15:00, Sat., 16 Aug. 0.0387 0.0350 0.0366
13:01-14:00, Sat., 16 Aug. 0.0397 0.0353 0.0369
12:01-13:00, Sat., 16 Aug. 0.0388 0.0350 0.0366
11:01-12:00, Sat., 16 Aug. 0.0388 0.0344 0.0366
10:01-11:00, Sat., 16 Aug. 0.0391 0.0345 0.0368
09:01-10:00, Sat., 16 Aug. 0.0392 0.0343 0.0366
08:01-09:00, Sat., 16 Aug. 0.0391 0.0346 0.0367
07:01-08:00, Sat., 16 Aug. 0.0381 0.0353 0.0366
06:01-07:00, Sat., 16 Aug. 0.0389 0.0343 0.0364
05:01-06:00, Sat., 16 Aug. 0.0391 0.0350 0.0368
04:01-05:00, Sat., 16 Aug. 0.0384 0.0348 0.0365
03:01-04:00, Sat., 16 Aug. 0.0381 0.0347 0.0366
02:01-03:00, Sat., 16 Aug. 0.0407 0.0341 0.0365
01:01-02:00, Sat., 16 Aug. 0.0384 0.0344 0.0365
00:01-01:00, Sat., 16 Aug. 0.0387 0.0349 0.0365
23:01-24:00, Fri., 15 Aug. 0.0390 0.0340 0.0364
22:01-23:00, Fri., 15 Aug. 0.0381 0.0343 0.0364
21:01-22:00, Fri., 15 Aug. 0.0383 0.0342 0.0364
20:01-21:00, Fri., 15 Aug. 0.0397 0.0345 0.0368
19:01-20:00, Fri., 15 Aug. 0.0394 0.0345 0.0364
18:01-19:00, Fri., 15 Aug. 0.0385 0.0342 0.0365
17:01-18:00, Fri., 15 Aug. 0.0390 0.0348 0.0369
16:01-17:00, Fri., 15 Aug. 0.0384 0.0342 0.0366
15:01-16:00, Fri., 15 Aug. 0.0391 0.0343 0.0368
14:01-15:00, Fri., 15 Aug. 0.0388 0.0350 0.0369
13:01-14:00, Fri., 15 Aug. 0.0392 0.0347 0.0367
12:01-13:00, Fri., 15 Aug. 0.0388 0.0336 0.0368
11:01-12:00, Fri., 15 Aug. 0.0388 0.0337 0.0367
10:01-11:00, Fri., 15 Aug. 0.0386 0.0347 0.0367
09:01-10:00, Fri., 15 Aug. 0.0388 0.0343 0.0367
08:01-09:00, Fri., 15 Aug. 0.0390 0.0341 0.0364
07:01-08:00, Fri., 15 Aug. 0.0394 0.0343 0.0369
06:01-07:00, Fri., 15 Aug. 0.0387 0.0337 0.0364
05:01-06:00, Fri., 15 Aug. 0.0386 0.0344 0.0365
04:01-05:00, Fri., 15 Aug. 0.0394 0.0350 0.0366
03:01-04:00, Fri., 15 Aug. 0.0394 0.0342 0.0365
02:01-03:00, Fri., 15 Aug. 0.0387 0.0344 0.0364
01:01-02:00, Fri., 15 Aug. 0.0389 0.0349 0.0365
00:01-01:00, Fri., 15 Aug. 0.0382 0.0350 0.0364
23:01-24:00, Thu., 14 Aug. 0.0386 0.0342 0.0365
22:01-23:00, Thu., 14 Aug. 0.0384 0.0343 0.0366
21:01-22:00, Thu., 14 Aug. 0.0397 0.0344 0.0367
20:01-21:00, Thu., 14 Aug. 0.0388 0.0342 0.0366
19:01-20:00, Thu., 14 Aug. 0.0384 0.0341 0.0363
18:01-19:00, Thu., 14 Aug. 0.0382 0.0341 0.0363
17:01-18:00, Thu., 14 Aug. 0.0384 0.0345 0.0365
16:01-17:00, Thu., 14 Aug. 0.0386 0.0344 0.0364
15:01-16:00, Thu., 14 Aug. 0.0395 0.0335 0.0366
14:01-15:00, Thu., 14 Aug. 0.0381 0.0346 0.0365
13:01-14:00, Thu., 14 Aug. 0.0383 0.0339 0.0367
12:01-13:00, Thu., 14 Aug. 0.0385 0.0343 0.0367
11:01-12:00, Thu., 14 Aug. 0.0390 0.0345 0.0367
10:01-11:00, Thu., 14 Aug. 0.0385 0.0338 0.0364
09:01-10:00, Thu., 14 Aug. 0.0384 0.0343 0.0364
08:01-09:00, Thu., 14 Aug. 0.0383 0.0344 0.0362
07:01-08:00, Thu., 14 Aug. 0.0388 0.0345 0.0365
06:01-07:00, Thu., 14 Aug. 0.0381 0.0345 0.0363
05:01-06:00, Thu., 14 Aug. 0.0387 0.0343 0.0364
04:01-05:00, Thu., 14 Aug. 0.0391 0.0345 0.0365
03:01-04:00, Thu., 14 Aug. 0.0389 0.0344 0.0364
02:01-03:00, Thu., 14 Aug. 0.0386 0.0348 0.0366
01:01-02:00, Thu., 14 Aug. 0.0393 0.0347 0.0368
00:01-01:00, Thu., 14 Aug. 0.0384 0.0331 0.0365
23:01-24:00, Wed., 13 Aug. 0.0398 0.0340 0.0369
22:01-23:00, Wed., 13 Aug. 0.0397 0.0348 0.0370
21:01-22:00, Wed., 13 Aug. 0.0384 0.0343 0.0366
20:01-21:00, Wed., 13 Aug. 0.0386 0.0347 0.0367
19:01-20:00, Wed., 13 Aug. 0.0385 0.0347 0.0366
18:01-19:00, Wed., 13 Aug. 0.0391 0.0343 0.0366
17:01-18:00, Wed., 13 Aug. 0.0388 0.0347 0.0365
16:01-17:00, Wed., 13 Aug. 0.0383 0.0342 0.0365
15:01-16:00, Wed., 13 Aug. 0.0386 0.0347 0.0368
14:01-15:00, Wed., 13 Aug. 0.0391 0.0345 0.0367
13:01-14:00, Wed., 13 Aug. 0.0399 0.0344 0.0368
12:01-13:00, Wed., 13 Aug. 0.0392 0.0347 0.0367
11:01-12:00, Wed., 13 Aug. 0.0388 0.0337 0.0368
10:01-11:00, Wed., 13 Aug. 0.0382 0.0343 0.0366
09:01-10:00, Wed., 13 Aug. 0.0382 0.0341 0.0363
08:01-09:00, Wed., 13 Aug. 0.0390 0.0347 0.0365
07:01-08:00, Wed., 13 Aug. 0.0396 0.0346 0.0364
06:01-07:00, Wed., 13 Aug. 0.0393 0.0342 0.0363
05:01-06:00, Wed., 13 Aug. 0.0378 0.0344 0.0362
04:01-05:00, Wed., 13 Aug. 0.0385 0.0347 0.0364
03:01-04:00, Wed., 13 Aug. 0.0383 0.0345 0.0364
02:01-03:00, Wed., 13 Aug. 0.0393 0.0343 0.0365
01:01-02:00, Wed., 13 Aug. 0.0385 0.0339 0.0363
00:01-01:00, Wed., 13 Aug. 0.0384 0.0342 0.0364
23:01-24:00, Tue., 12 Aug. 0.0398 0.0346 0.0370
22:01-23:00, Tue., 12 Aug. 0.0391 0.0349 0.0368
21:01-22:00, Tue., 12 Aug. 0.0398 0.0350 0.0378
20:01-21:00, Tue., 12 Aug. 0.0425 0.0383 0.0402
19:01-20:00, Tue., 12 Aug. 0.0425 0.0378 0.0404
18:01-19:00, Tue., 12 Aug. 0.0424 0.0358 0.0387
17:01-18:00, Tue., 12 Aug. 0.0398 0.0340 0.0372
16:01-17:00, Tue., 12 Aug. 0.0398 0.0337 0.0366
15:01-16:00, Tue., 12 Aug. 0.0386 0.0343 0.0362
14:01-15:00, Tue., 12 Aug. 0.0394 0.0347 0.0364
13:01-14:00, Tue., 12 Aug. 0.0388 0.0337 0.0366
12:01-13:00, Tue., 12 Aug. 0.0384 0.0340 0.0365
11:01-12:00, Tue., 12 Aug. 0.0378 0.0342 0.0361
10:01-11:00, Tue., 12 Aug. 0.0390 0.0339 0.0363
09:01-10:00, Tue., 12 Aug. 0.0383 0.0342 0.0362
08:01-09:00, Tue., 12 Aug. 0.0378 0.0343 0.0362
07:01-08:00, Tue., 12 Aug. 0.0387 0.0345 0.0361
06:01-07:00, Tue., 12 Aug. 0.0383 0.0340 0.0362
05:01-06:00, Tue., 12 Aug. 0.0384 0.0340 0.0363
04:01-05:00, Tue., 12 Aug. 0.0380 0.0346 0.0362
03:01-04:00, Tue., 12 Aug. 0.0383 0.0338 0.0360
02:01-03:00, Tue., 12 Aug. 0.0378 0.0341 0.0362
01:01-02:00, Tue., 12 Aug. 0.0381 0.0341 0.0360
00:01-01:00, Tue., 12 Aug. 0.0384 0.0336 0.0363
23:01-24:00, Mon., 11 Aug. 0.0382 0.0340 0.0359
22:01-23:00, Mon., 11 Aug. 0.0381 0.0342 0.0360
21:01-22:00, Mon., 11 Aug. 0.0382 0.0340 0.0361
20:01-21:00, Mon., 11 Aug. 0.0391 0.0343 0.0362
19:01-20:00, Mon., 11 Aug. 0.0379 0.0342 0.0365
18:01-19:00, Mon., 11 Aug. 0.0392 0.0342 0.0367
17:01-18:00, Mon., 11 Aug. 0.0393 0.0342 0.0368
16:01-17:00, Mon., 11 Aug. 0.0395 0.0360 0.0377
15:01-16:00, Mon., 11 Aug. 0.0441 0.0363 0.0410
14:01-15:00, Mon., 11 Aug. 0.0519 0.0408 0.0463
13:01-14:00, Mon., 11 Aug. 0.0546 0.0476 0.0513
12:01-13:00, Mon., 11 Aug. 0.0504 0.0378 0.0436
11:01-12:00, Mon., 11 Aug. 0.0456 0.0382 0.0425
10:01-11:00, Mon., 11 Aug. 0.0465 0.0383 0.0420
09:01-10:00, Mon., 11 Aug. 0.0416 0.0359 0.0390
08:01-09:00, Mon., 11 Aug. 0.0388 0.0347 0.0368
07:01-08:00, Mon., 11 Aug. 0.0381 0.0343 0.0362
06:01-07:00, Mon., 11 Aug. 0.0389 0.0352 0.0368
05:01-06:00, Mon., 11 Aug. 0.0401 0.0359 0.0381
04:01-05:00, Mon., 11 Aug. 0.0428 0.0357 0.0407
03:01-04:00, Mon., 11 Aug. 0.0436 0.0390 0.0413
02:01-03:00, Mon., 11 Aug. 0.0458 0.0400 0.0429
01:01-02:00, Mon., 11 Aug. 0.0448 0.0367 0.0406
00:01-01:00, Mon., 11 Aug. 0.0415 0.0350 0.0384
23:01-24:00, Sun., 10 Aug. 0.0382 0.0336 0.0360
22:01-23:00, Sun., 10 Aug. 0.0379 0.0341 0.0361
21:01-22:00, Sun., 10 Aug. 0.0388 0.0345 0.0364
20:01-21:00, Sun., 10 Aug. 0.0415 0.0358 0.0383
19:01-20:00, Sun., 10 Aug. 0.0455 0.0384 0.0426
18:01-19:00, Sun., 10 Aug. 0.0460 0.0416 0.0435
17:01-18:00, Sun., 10 Aug. 0.0454 0.0411 0.0430
16:01-17:00, Sun., 10 Aug. 0.0436 0.0380 0.0402
15:01-16:00, Sun., 10 Aug. 0.0431 0.0373 0.0395
14:01-15:00, Sun., 10 Aug. 0.0430 0.0363 0.0397
13:01-14:00, Sun., 10 Aug. 0.0419 0.0370 0.0394
12:01-13:00, Sun., 10 Aug. 0.0408 0.0355 0.0381
11:01-12:00, Sun., 10 Aug. 0.0420 0.0369 0.0398
10:01-11:00, Sun., 10 Aug. 0.0429 0.0391 0.0411
09:01-10:00, Sun., 10 Aug. 0.0456 0.0404 0.0427
08:01-09:00, Sun., 10 Aug. 0.0453 0.0378 0.0414
07:01-08:00, Sun., 10 Aug. 0.0409 0.0363 0.0385
06:01-07:00, Sun., 10 Aug. 0.0400 0.0360 0.0382
05:01-06:00, Sun., 10 Aug. 0.0405 0.0360 0.0382
04:01-05:00, Sun., 10 Aug. 0.0411 0.0364 0.0391
03:01-04:00, Sun., 10 Aug. 0.0426 0.0366 0.0396
02:01-03:00, Sun., 10 Aug. 0.0402 0.0358 0.0380
01:01-02:00, Sun., 10 Aug. 0.0400 0.0358 0.0379
00:01-01:00, Sun., 10 Aug. 0.0402 0.0360 0.0380
23:01-24:00, Sat., 09 Aug. 0.0406 0.0353 0.0381
22:01-23:00, Sat., 09 Aug. 0.0404 0.0351 0.0378
21:01-22:00, Sat., 09 Aug. 0.0402 0.0363 0.0380
20:01-21:00, Sat., 09 Aug. 0.0400 0.0362 0.0381
19:01-20:00, Sat., 09 Aug. 0.0409 0.0358 0.0380
18:01-19:00, Sat., 09 Aug. 0.0399 0.0354 0.0381
17:01-18:00, Sat., 09 Aug. 0.0403 0.0361 0.0380
16:01-17:00, Sat., 09 Aug. 0.0398 0.0351 0.0379
15:01-16:00, Sat., 09 Aug. 0.0403 0.0354 0.0382
14:01-15:00, Sat., 09 Aug. 0.0402 0.0357 0.0383
13:01-14:00, Sat., 09 Aug. 0.0399 0.0365 0.0383
12:01-13:00, Sat., 09 Aug. 0.0408 0.0360 0.0380
11:01-12:00, Sat., 09 Aug. 0.0409 0.0358 0.0383
10:01-11:00, Sat., 09 Aug. 0.0409 0.0357 0.0380
09:01-10:00, Sat., 09 Aug. 0.0399 0.0364 0.0379
08:01-09:00, Sat., 09 Aug. 0.0402 0.0360 0.0381
07:01-08:00, Sat., 09 Aug. 0.0398 0.0359 0.0381
06:01-07:00, Sat., 09 Aug. 0.0395 0.0354 0.0379
05:01-06:00, Sat., 09 Aug. 0.0404 0.0352 0.0380
04:01-05:00, Sat., 09 Aug. 0.0395 0.0362 0.0380
03:01-04:00, Sat., 09 Aug. 0.0398 0.0353 0.0377
02:01-03:00, Sat., 09 Aug. 0.0402 0.0360 0.0378
01:01-02:00, Sat., 09 Aug. 0.0396 0.0360 0.0376
00:01-01:00, Sat., 09 Aug. 0.0408 0.0356 0.0378
23:01-24:00, Fri., 08 Aug. 0.0399 0.0355 0.0380
22:01-23:00, Fri., 08 Aug. 0.0394 0.0355 0.0377
21:01-22:00, Fri., 08 Aug. 0.0399 0.0357 0.0377
20:01-21:00, Fri., 08 Aug. 0.0394 0.0352 0.0377
19:01-20:00, Fri., 08 Aug. 0.0402 0.0355 0.0380
18:01-19:00, Fri., 08 Aug. 0.0400 0.0351 0.0379
17:01-18:00, Fri., 08 Aug. 0.0407 0.0361 0.0380