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
10:01-11:00, Fri., 27 Mar. 0.0385 0.0346 0.0364
09:01-10:00, Fri., 27 Mar. 0.0388 0.0340 0.0363
08:01-09:00, Fri., 27 Mar. 0.0390 0.0348 0.0366
07:01-08:00, Fri., 27 Mar. 0.0387 0.0339 0.0365
06:01-07:00, Fri., 27 Mar. 0.0383 0.0340 0.0364
05:01-06:00, Fri., 27 Mar. 0.0394 0.0341 0.0369
04:01-05:00, Fri., 27 Mar. 0.0388 0.0336 0.0364
03:01-04:00, Fri., 27 Mar. 0.0387 0.0348 0.0367
02:01-03:00, Fri., 27 Mar. 0.0395 0.0347 0.0364
01:01-02:00, Fri., 27 Mar. 0.0389 0.0344 0.0365
00:01-01:00, Fri., 27 Mar. 0.0386 0.0348 0.0363
23:01-24:00, Thu., 26 Mar. 0.0390 0.0337 0.0366
22:01-23:00, Thu., 26 Mar. 0.0394 0.0326 0.0365
21:01-22:00, Thu., 26 Mar. 0.0393 0.0343 0.0366
20:01-21:00, Thu., 26 Mar. 0.0384 0.0343 0.0362
19:01-20:00, Thu., 26 Mar. 0.0377 0.0336 0.0360
18:01-19:00, Thu., 26 Mar. 0.0388 0.0340 0.0364
17:01-18:00, Thu., 26 Mar. 0.0401 0.0343 0.0362
16:01-17:00, Thu., 26 Mar. 0.0391 0.0346 0.0364
15:01-16:00, Thu., 26 Mar. 0.0391 0.0336 0.0367
14:01-15:00, Thu., 26 Mar. 0.0395 0.0353 0.0374
13:01-14:00, Thu., 26 Mar. 0.0402 0.0363 0.0381
12:01-13:00, Thu., 26 Mar. 0.0407 0.0361 0.0386
11:01-12:00, Thu., 26 Mar. 0.0412 0.0357 0.0383
10:01-11:00, Thu., 26 Mar. 0.0415 0.0357 0.0387
09:01-10:00, Thu., 26 Mar. 0.0410 0.0371 0.0390
08:01-09:00, Thu., 26 Mar. 0.0414 0.0363 0.0393
07:01-08:00, Thu., 26 Mar. 0.0423 0.0371 0.0397
06:01-07:00, Thu., 26 Mar. 0.0425 0.0383 0.0404
05:01-06:00, Thu., 26 Mar. 0.0422 0.0381 0.0403
04:01-05:00, Thu., 26 Mar. 0.0419 0.0380 0.0402
03:01-04:00, Thu., 26 Mar. 0.0422 0.0387 0.0403
02:01-03:00, Thu., 26 Mar. 0.0438 0.0387 0.0409
01:01-02:00, Thu., 26 Mar. 0.0440 0.0385 0.0413
00:01-01:00, Thu., 26 Mar. 0.0443 0.0395 0.0419
23:01-24:00, Wed., 25 Mar. 0.0441 0.0400 0.0422
22:01-23:00, Wed., 25 Mar. 0.0435 0.0389 0.0413
21:01-22:00, Wed., 25 Mar. 0.0433 0.0381 0.0409
20:01-21:00, Wed., 25 Mar. 0.0436 0.0381 0.0401
19:01-20:00, Wed., 25 Mar. 0.0432 0.0384 0.0410
18:01-19:00, Wed., 25 Mar. 0.0436 0.0385 0.0413
17:01-18:00, Wed., 25 Mar. 0.0445 0.0390 0.0418
16:01-17:00, Wed., 25 Mar. 0.0442 0.0394 0.0412
15:01-16:00, Wed., 25 Mar. 0.0448 0.0395 0.0416
14:01-15:00, Wed., 25 Mar. 0.0432 0.0381 0.0410
13:01-14:00, Wed., 25 Mar. 0.0426 0.0366 0.0403
12:01-13:00, Wed., 25 Mar. 0.0422 0.0367 0.0386
11:01-12:00, Wed., 25 Mar. 0.0396 0.0353 0.0374
10:01-11:00, Wed., 25 Mar. 0.0388 0.0352 0.0372
09:01-10:00, Wed., 25 Mar. 0.0390 0.0348 0.0372
08:01-09:00, Wed., 25 Mar. 0.0392 0.0345 0.0372
07:01-08:00, Wed., 25 Mar. 0.0400 0.0353 0.0374
06:01-07:00, Wed., 25 Mar. 0.0388 0.0357 0.0374
05:01-06:00, Wed., 25 Mar. 0.0391 0.0350 0.0371
04:01-05:00, Wed., 25 Mar. 0.0395 0.0354 0.0374
03:01-04:00, Wed., 25 Mar. 0.0389 0.0352 0.0372
02:01-03:00, Wed., 25 Mar. 0.0392 0.0335 0.0371
01:01-02:00, Wed., 25 Mar. 0.0393 0.0347 0.0370
00:01-01:00, Wed., 25 Mar. 0.0398 0.0347 0.0371
23:01-24:00, Tue., 24 Mar. 0.0393 0.0355 0.0374
22:01-23:00, Tue., 24 Mar. 0.0389 0.0347 0.0370
21:01-22:00, Tue., 24 Mar. 0.0392 0.0350 0.0372
20:01-21:00, Tue., 24 Mar. 0.0390 0.0347 0.0371
19:01-20:00, Tue., 24 Mar. 0.0397 0.0350 0.0370
18:01-19:00, Tue., 24 Mar. 0.0393 0.0349 0.0368
17:01-18:00, Tue., 24 Mar. 0.0386 0.0347 0.0369
16:01-17:00, Tue., 24 Mar. 0.0389 0.0357 0.0371
15:01-16:00, Tue., 24 Mar. 0.0390 0.0354 0.0373
14:01-15:00, Tue., 24 Mar. 0.0389 0.0356 0.0373
13:01-14:00, Tue., 24 Mar. 0.0389 0.0343 0.0369
12:01-13:00, Tue., 24 Mar. 0.0394 0.0349 0.0372
11:01-12:00, Tue., 24 Mar. 0.0397 0.0349 0.0372
10:01-11:00, Tue., 24 Mar. 0.0390 0.0350 0.0372
09:01-10:00, Tue., 24 Mar. 0.0392 0.0346 0.0369
08:01-09:00, Tue., 24 Mar. 0.0386 0.0349 0.0371
07:01-08:00, Tue., 24 Mar. 0.0402 0.0351 0.0373
06:01-07:00, Tue., 24 Mar. 0.0393 0.0347 0.0371
05:01-06:00, Tue., 24 Mar. 0.0394 0.0346 0.0370
04:01-05:00, Tue., 24 Mar. 0.0397 0.0350 0.0371
03:01-04:00, Tue., 24 Mar. 0.0388 0.0340 0.0371
02:01-03:00, Tue., 24 Mar. 0.0395 0.0347 0.0371
01:01-02:00, Tue., 24 Mar. 0.0399 0.0346 0.0372
00:01-01:00, Tue., 24 Mar. 0.0396 0.0352 0.0372
23:01-24:00, Mon., 23 Mar. 0.0397 0.0343 0.0373
22:01-23:00, Mon., 23 Mar. 0.0390 0.0347 0.0371
21:01-22:00, Mon., 23 Mar. 0.0390 0.0350 0.0371
20:01-21:00, Mon., 23 Mar. 0.0397 0.0349 0.0369
19:01-20:00, Mon., 23 Mar. 0.0391 0.0346 0.0369
18:01-19:00, Mon., 23 Mar. 0.0398 0.0350 0.0369
17:01-18:00, Mon., 23 Mar. 0.0391 0.0353 0.0371
16:01-17:00, Mon., 23 Mar. 0.0393 0.0345 0.0367
15:01-16:00, Mon., 23 Mar. 0.0390 0.0345 0.0367
14:01-15:00, Mon., 23 Mar. 0.0391 0.0351 0.0369
13:01-14:00, Mon., 23 Mar. 0.0400 0.0349 0.0371
12:01-13:00, Mon., 23 Mar. 0.0398 0.0350 0.0373
11:01-12:00, Mon., 23 Mar. 0.0397 0.0356 0.0379
10:01-11:00, Mon., 23 Mar. 0.0431 0.0362 0.0387
09:01-10:00, Mon., 23 Mar. 0.0438 0.0381 0.0404
08:01-09:00, Mon., 23 Mar. 0.0427 0.0385 0.0407
07:01-08:00, Mon., 23 Mar. 0.0426 0.0374 0.0398
06:01-07:00, Mon., 23 Mar. 0.0409 0.0358 0.0379
05:01-06:00, Mon., 23 Mar. 0.0395 0.0350 0.0372
04:01-05:00, Mon., 23 Mar. 0.0402 0.0345 0.0375
03:01-04:00, Mon., 23 Mar. 0.0398 0.0355 0.0376
02:01-03:00, Mon., 23 Mar. 0.0394 0.0357 0.0373
01:01-02:00, Mon., 23 Mar. 0.0394 0.0355 0.0373
00:01-01:00, Mon., 23 Mar. 0.0393 0.0344 0.0372
23:01-24:00, Sun., 22 Mar. 0.0390 0.0354 0.0371
22:01-23:00, Sun., 22 Mar. 0.0390 0.0355 0.0374
21:01-22:00, Sun., 22 Mar. 0.0392 0.0337 0.0370
20:01-21:00, Sun., 22 Mar. 0.0402 0.0347 0.0373
19:01-20:00, Sun., 22 Mar. 0.0390 0.0348 0.0370
18:01-19:00, Sun., 22 Mar. 0.0392 0.0354 0.0372
17:01-18:00, Sun., 22 Mar. 0.0398 0.0350 0.0370
16:01-17:00, Sun., 22 Mar. 0.0392 0.0352 0.0372
15:01-16:00, Sun., 22 Mar. 0.0389 0.0355 0.0371
14:01-15:00, Sun., 22 Mar. 0.0393 0.0339 0.0372
13:01-14:00, Sun., 22 Mar. 0.0384 0.0346 0.0369
12:01-13:00, Sun., 22 Mar. 0.0391 0.0352 0.0373
11:01-12:00, Sun., 22 Mar. 0.0403 0.0350 0.0373
10:01-11:00, Sun., 22 Mar. 0.0401 0.0360 0.0374
09:01-10:00, Sun., 22 Mar. 0.0399 0.0356 0.0376
08:01-09:00, Sun., 22 Mar. 0.0396 0.0355 0.0377
07:01-08:00, Sun., 22 Mar. 0.0397 0.0355 0.0377
06:01-07:00, Sun., 22 Mar. 0.0402 0.0346 0.0375
05:01-06:00, Sun., 22 Mar. 0.0396 0.0348 0.0377
04:01-05:00, Sun., 22 Mar. 0.0391 0.0354 0.0375
03:01-04:00, Sun., 22 Mar. 0.0398 0.0336 0.0373
02:01-03:00, Sun., 22 Mar. 0.0390 0.0352 0.0371
01:01-02:00, Sun., 22 Mar. 0.0389 0.0352 0.0370
00:01-01:00, Sun., 22 Mar. 0.0390 0.0353 0.0371
23:01-24:00, Sat., 21 Mar. 0.0387 0.0350 0.0370
22:01-23:00, Sat., 21 Mar. 0.0393 0.0346 0.0370
21:01-22:00, Sat., 21 Mar. 0.0394 0.0348 0.0372
20:01-21:00, Sat., 21 Mar. 0.0408 0.0350 0.0372
19:01-20:00, Sat., 21 Mar. 0.0391 0.0350 0.0373
18:01-19:00, Sat., 21 Mar. 0.0393 0.0346 0.0371
17:01-18:00, Sat., 21 Mar. 0.0391 0.0352 0.0372
16:01-17:00, Sat., 21 Mar. 0.0397 0.0350 0.0372
15:01-16:00, Sat., 21 Mar. 0.0394 0.0353 0.0372
14:01-15:00, Sat., 21 Mar. 0.0396 0.0354 0.0374
13:01-14:00, Sat., 21 Mar. 0.0391 0.0354 0.0373
12:01-13:00, Sat., 21 Mar. 0.0393 0.0350 0.0372
11:01-12:00, Sat., 21 Mar. 0.0396 0.0352 0.0373
10:01-11:00, Sat., 21 Mar. 0.0392 0.0345 0.0371
09:01-10:00, Sat., 21 Mar. 0.0397 0.0346 0.0374
08:01-09:00, Sat., 21 Mar. 0.0400 0.0350 0.0372
07:01-08:00, Sat., 21 Mar. 0.0393 0.0350 0.0373
06:01-07:00, Sat., 21 Mar. 0.0391 0.0350 0.0372
05:01-06:00, Sat., 21 Mar. 0.0398 0.0352 0.0374
04:01-05:00, Sat., 21 Mar. 0.0391 0.0347 0.0370
03:01-04:00, Sat., 21 Mar. 0.0391 0.0353 0.0372
02:01-03:00, Sat., 21 Mar. 0.0405 0.0350 0.0374
01:01-02:00, Sat., 21 Mar. 0.0395 0.0340 0.0371
00:01-01:00, Sat., 21 Mar. 0.0387 0.0353 0.0370
23:01-24:00, Fri., 20 Mar. 0.0395 0.0353 0.0370
22:01-23:00, Fri., 20 Mar. 0.0401 0.0346 0.0371
21:01-22:00, Fri., 20 Mar. 0.0388 0.0349 0.0370
20:01-21:00, Fri., 20 Mar. 0.0397 0.0353 0.0371
19:01-20:00, Fri., 20 Mar. 0.0396 0.0349 0.0374
18:01-19:00, Fri., 20 Mar. 0.0399 0.0353 0.0377
17:01-18:00, Fri., 20 Mar. 0.0398 0.0360 0.0382
16:01-17:00, Fri., 20 Mar. 0.0389 0.0346 0.0369
15:01-16:00, Fri., 20 Mar. 0.0394 0.0353 0.0372
14:01-15:00, Fri., 20 Mar. 0.0412 0.0349 0.0380
13:01-14:00, Fri., 20 Mar. 0.0408 0.0353 0.0385
12:01-13:00, Fri., 20 Mar. 0.0405 0.0364 0.0384
11:01-12:00, Fri., 20 Mar. 0.0440 0.0367 0.0408
10:01-11:00, Fri., 20 Mar. 0.0460 0.0364 0.0413
09:01-10:00, Fri., 20 Mar. 0.0408 0.0356 0.0377
08:01-09:00, Fri., 20 Mar. 0.0426 0.0360 0.0390
07:01-08:00, Fri., 20 Mar. 0.0429 0.0355 0.0396
06:01-07:00, Fri., 20 Mar. 0.0415 0.0356 0.0379
05:01-06:00, Fri., 20 Mar. 0.0409 0.0350 0.0384
04:01-05:00, Fri., 20 Mar. 0.0398 0.0343 0.0373
03:01-04:00, Fri., 20 Mar. 0.0398 0.0350 0.0374
02:01-03:00, Fri., 20 Mar. 0.0397 0.0355 0.0373
01:01-02:00, Fri., 20 Mar. 0.0399 0.0357 0.0377
00:01-01:00, Fri., 20 Mar. 0.0406 0.0353 0.0383
23:01-24:00, Thu., 19 Mar. 0.0410 0.0360 0.0387
22:01-23:00, Thu., 19 Mar. 0.0408 0.0355 0.0381
21:01-22:00, Thu., 19 Mar. 0.0393 0.0351 0.0372
20:01-21:00, Thu., 19 Mar. 0.0398 0.0353 0.0372
19:01-20:00, Thu., 19 Mar. 0.0389 0.0350 0.0370
18:01-19:00, Thu., 19 Mar. 0.0388 0.0352 0.0373
17:01-18:00, Thu., 19 Mar. 0.0395 0.0351 0.0374
16:01-17:00, Thu., 19 Mar. 0.0394 0.0350 0.0371
15:01-16:00, Thu., 19 Mar. 0.0395 0.0350 0.0372
14:01-15:00, Thu., 19 Mar. 0.0395 0.0353 0.0373
13:01-14:00, Thu., 19 Mar. 0.0389 0.0357 0.0372
12:01-13:00, Thu., 19 Mar. 0.0404 0.0351 0.0376
11:01-12:00, Thu., 19 Mar. 0.0395 0.0350 0.0373
10:01-11:00, Thu., 19 Mar. 0.0391 0.0353 0.0376
09:01-10:00, Thu., 19 Mar. 0.0399 0.0351 0.0374
08:01-09:00, Thu., 19 Mar. 0.0404 0.0350 0.0381
07:01-08:00, Thu., 19 Mar. 0.0423 0.0367 0.0391
06:01-07:00, Thu., 19 Mar. 0.0434 0.0388 0.0407
05:01-06:00, Thu., 19 Mar. 0.0418 0.0355 0.0382
04:01-05:00, Thu., 19 Mar. 0.0395 0.0355 0.0372
03:01-04:00, Thu., 19 Mar. 0.0402 0.0353 0.0375
02:01-03:00, Thu., 19 Mar. 0.0400 0.0349 0.0371
01:01-02:00, Thu., 19 Mar. 0.0391 0.0347 0.0371
00:01-01:00, Thu., 19 Mar. 0.0397 0.0353 0.0372
23:01-24:00, Wed., 18 Mar. 0.0388 0.0353 0.0371
22:01-23:00, Wed., 18 Mar. 0.0393 0.0348 0.0369
21:01-22:00, Wed., 18 Mar. 0.0398 0.0353 0.0370
20:01-21:00, Wed., 18 Mar. 0.0386 0.0352 0.0368
19:01-20:00, Wed., 18 Mar. 0.0393 0.0349 0.0369
18:01-19:00, Wed., 18 Mar. 0.0397 0.0345 0.0371
17:01-18:00, Wed., 18 Mar. 0.0388 0.0350 0.0369
16:01-17:00, Wed., 18 Mar. 0.0402 0.0353 0.0372
15:01-16:00, Wed., 18 Mar. 0.0397 0.0349 0.0370
14:01-15:00, Wed., 18 Mar. 0.0386 0.0347 0.0368
13:01-14:00, Wed., 18 Mar. 0.0387 0.0350 0.0368
12:01-13:00, Wed., 18 Mar. 0.0394 0.0346 0.0369
11:01-12:00, Wed., 18 Mar. 0.0390 0.0347 0.0370
10:01-11:00, Wed., 18 Mar. 0.0411 0.0349 0.0373
09:01-10:00, Wed., 18 Mar. 0.0391 0.0353 0.0373
08:01-09:00, Wed., 18 Mar. 0.0397 0.0359 0.0374
07:01-08:00, Wed., 18 Mar. 0.0391 0.0354 0.0372
06:01-07:00, Wed., 18 Mar. 0.0385 0.0343 0.0372
05:01-06:00, Wed., 18 Mar. 0.0385 0.0347 0.0370
04:01-05:00, Wed., 18 Mar. 0.0394 0.0353 0.0369
03:01-04:00, Wed., 18 Mar. 0.0394 0.0345 0.0371
02:01-03:00, Wed., 18 Mar. 0.0393 0.0353 0.0371
01:01-02:00, Wed., 18 Mar. 0.0390 0.0340 0.0369
00:01-01:00, Wed., 18 Mar. 0.0389 0.0353 0.0370
23:01-24:00, Tue., 17 Mar. 0.0402 0.0344 0.0371
22:01-23:00, Tue., 17 Mar. 0.0392 0.0343 0.0369
21:01-22:00, Tue., 17 Mar. 0.0394 0.0347 0.0369
20:01-21:00, Tue., 17 Mar. 0.0389 0.0345 0.0370
19:01-20:00, Tue., 17 Mar. 0.0389 0.0350 0.0369
18:01-19:00, Tue., 17 Mar. 0.0391 0.0333 0.0370
17:01-18:00, Tue., 17 Mar. 0.0388 0.0352 0.0371
16:01-17:00, Tue., 17 Mar. 0.0388 0.0351 0.0370
15:01-16:00, Tue., 17 Mar. 0.0394 0.0356 0.0372
14:01-15:00, Tue., 17 Mar. 0.0402 0.0346 0.0370
13:01-14:00, Tue., 17 Mar. 0.0394 0.0344 0.0371
12:01-13:00, Tue., 17 Mar. 0.0389 0.0335 0.0369
11:01-12:00, Tue., 17 Mar. 0.0395 0.0341 0.0371