Radiation doses in the air / Measurement results by the hour (Shinjuku)

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. 0.0390 0.0340 0.0360
11:01-12:00, Sat., 26 Apr. 0.0388 0.0340 0.0360
10:01-11:00, Sat., 26 Apr. 0.0387 0.0343 0.0360
09:01-10:00, Sat., 26 Apr. 0.0391 0.0339 0.0361
08:01-09:00, Sat., 26 Apr. 0.0383 0.0330 0.0356
07:01-08:00, Sat., 26 Apr. 0.0376 0.0327 0.0354
06:01-07:00, Sat., 26 Apr. 0.0375 0.0325 0.0355
05:01-06:00, Sat., 26 Apr. 0.0398 0.0333 0.0356
04:01-05:00, Sat., 26 Apr. 0.0388 0.0336 0.0358
03:01-04:00, Sat., 26 Apr. 0.0374 0.0341 0.0356
02:01-03:00, Sat., 26 Apr. 0.0390 0.0336 0.0359
01:01-02:00, Sat., 26 Apr. 0.0393 0.0328 0.0361
00:01-01:00, Sat., 26 Apr. 0.0376 0.0342 0.0361
23:01-24:00, Fri., 25 Apr. 0.0387 0.0337 0.0359
22:01-23:00, Fri., 25 Apr. 0.0371 0.0327 0.0356
21:01-22:00, Fri., 25 Apr. 0.0392 0.0339 0.0358
20:01-21:00, Fri., 25 Apr. 0.0375 0.0331 0.0357
19:01-20:00, Fri., 25 Apr. 0.0394 0.0338 0.0359
18:01-19:00, Fri., 25 Apr. 0.0390 0.0335 0.0357
17:01-18:00, Fri., 25 Apr. 0.0386 0.0340 0.0358
16:01-17:00, Fri., 25 Apr. 0.0384 0.0328 0.0357
15:01-16:00, Fri., 25 Apr. 0.0380 0.0333 0.0357
14:01-15:00, Fri., 25 Apr. 0.0376 0.0336 0.0357
13:01-14:00, Fri., 25 Apr. 0.0385 0.0340 0.0360
12:01-13:00, Fri., 25 Apr. 0.0376 0.0345 0.0359
11:01-12:00, Fri., 25 Apr. 0.0374 0.0333 0.0357
10:01-11:00, Fri., 25 Apr. 0.0375 0.0339 0.0358
09:01-10:00, Fri., 25 Apr. 0.0377 0.0333 0.0358
08:01-09:00, Fri., 25 Apr. 0.0384 0.0333 0.0358
07:01-08:00, Fri., 25 Apr. 0.0387 0.0334 0.0359
06:01-07:00, Fri., 25 Apr. 0.0373 0.0343 0.0359
05:01-06:00, Fri., 25 Apr. 0.0381 0.0333 0.0357
04:01-05:00, Fri., 25 Apr. 0.0375 0.0342 0.0358
03:01-04:00, Fri., 25 Apr. 0.0376 0.0328 0.0356
02:01-03:00, Fri., 25 Apr. 0.0381 0.0333 0.0355
01:01-02:00, Fri., 25 Apr. 0.0392 0.0340 0.0360
00:01-01:00, Fri., 25 Apr. 0.0377 0.0338 0.0357
23:01-24:00, Thu., 24 Apr. 0.0372 0.0335 0.0355
22:01-23:00, Thu., 24 Apr. 0.0383 0.0337 0.0356
21:01-22:00, Thu., 24 Apr. 0.0389 0.0332 0.0358
20:01-21:00, Thu., 24 Apr. 0.0380 0.0331 0.0358
19:01-20:00, Thu., 24 Apr. 0.0387 0.0340 0.0358
18:01-19:00, Thu., 24 Apr. 0.0383 0.0341 0.0357
17:01-18:00, Thu., 24 Apr. 0.0376 0.0341 0.0358
16:01-17:00, Thu., 24 Apr. 0.0379 0.0329 0.0356
15:01-16:00, Thu., 24 Apr. 0.0379 0.0339 0.0358
14:01-15:00, Thu., 24 Apr. 0.0379 0.0325 0.0360
13:01-14:00, Thu., 24 Apr. 0.0398 0.0332 0.0358
12:01-13:00, Thu., 24 Apr. 0.0375 0.0331 0.0355
11:01-12:00, Thu., 24 Apr. 0.0388 0.0329 0.0357
10:01-11:00, Thu., 24 Apr. 0.0388 0.0337 0.0358
09:01-10:00, Thu., 24 Apr. 0.0389 0.0338 0.0362
08:01-09:00, Thu., 24 Apr. 0.0390 0.0335 0.0359
07:01-08:00, Thu., 24 Apr. 0.0371 0.0344 0.0358
06:01-07:00, Thu., 24 Apr. 0.0391 0.0341 0.0362
05:01-06:00, Thu., 24 Apr. 0.0400 0.0340 0.0360
04:01-05:00, Thu., 24 Apr. 0.0383 0.0336 0.0360
03:01-04:00, Thu., 24 Apr. 0.0396 0.0336 0.0358
02:01-03:00, Thu., 24 Apr. 0.0380 0.0333 0.0356
01:01-02:00, Thu., 24 Apr. 0.0380 0.0335 0.0357
00:01-01:00, Thu., 24 Apr. 0.0383 0.0330 0.0358
23:01-24:00, Wed., 23 Apr. 0.0380 0.0332 0.0356
22:01-23:00, Wed., 23 Apr. 0.0393 0.0337 0.0357
21:01-22:00, Wed., 23 Apr. 0.0374 0.0333 0.0356
20:01-21:00, Wed., 23 Apr. 0.0385 0.0333 0.0356
19:01-20:00, Wed., 23 Apr. 0.0378 0.0334 0.0356
18:01-19:00, Wed., 23 Apr. 0.0387 0.0338 0.0358
17:01-18:00, Wed., 23 Apr. 0.0413 0.0341 0.0368
16:01-17:00, Wed., 23 Apr. 0.0419 0.0346 0.0380
15:01-16:00, Wed., 23 Apr. 0.0452 0.0360 0.0405
14:01-15:00, Wed., 23 Apr. 0.0442 0.0364 0.0405
13:01-14:00, Wed., 23 Apr. 0.0422 0.0360 0.0391
12:01-13:00, Wed., 23 Apr. 0.0430 0.0369 0.0397
11:01-12:00, Wed., 23 Apr. 0.0431 0.0358 0.0393
10:01-11:00, Wed., 23 Apr. 0.0416 0.0355 0.0383
09:01-10:00, Wed., 23 Apr. 0.0410 0.0348 0.0377
08:01-09:00, Wed., 23 Apr. 0.0404 0.0344 0.0366
07:01-08:00, Wed., 23 Apr. 0.0393 0.0339 0.0363
06:01-07:00, Wed., 23 Apr. 0.0416 0.0348 0.0377
05:01-06:00, Wed., 23 Apr. 0.0463 0.0376 0.0417
04:01-05:00, Wed., 23 Apr. 0.0502 0.0410 0.0447
03:01-04:00, Wed., 23 Apr. 0.0481 0.0423 0.0452
02:01-03:00, Wed., 23 Apr. 0.0492 0.0395 0.0436
01:01-02:00, Wed., 23 Apr. 0.0440 0.0329 0.0373
00:01-01:00, Wed., 23 Apr. 0.0419 0.0341 0.0359
23:01-24:00, Tue., 22 Apr. 0.0385 0.0324 0.0358
22:01-23:00, Tue., 22 Apr. 0.0388 0.0337 0.0359
21:01-22:00, Tue., 22 Apr. 0.0394 0.0340 0.0360
20:01-21:00, Tue., 22 Apr. 0.0390 0.0332 0.0359
19:01-20:00, Tue., 22 Apr. 0.0376 0.0341 0.0361
18:01-19:00, Tue., 22 Apr. 0.0376 0.0341 0.0359
17:01-18:00, Tue., 22 Apr. 0.0388 0.0339 0.0359
16:01-17:00, Tue., 22 Apr. 0.0376 0.0340 0.0359
15:01-16:00, Tue., 22 Apr. 0.0377 0.0339 0.0358
14:01-15:00, Tue., 22 Apr. 0.0373 0.0333 0.0357
13:01-14:00, Tue., 22 Apr. 0.0394 0.0338 0.0360
12:01-13:00, Tue., 22 Apr. 0.0375 0.0336 0.0357
11:01-12:00, Tue., 22 Apr. 0.0388 0.0328 0.0360
10:01-11:00, Tue., 22 Apr. 0.0388 0.0335 0.0362
09:01-10:00, Tue., 22 Apr. 0.0387 0.0336 0.0363
08:01-09:00, Tue., 22 Apr. 0.0390 0.0345 0.0362
07:01-08:00, Tue., 22 Apr. 0.0393 0.0344 0.0366
06:01-07:00, Tue., 22 Apr. 0.0395 0.0344 0.0365
05:01-06:00, Tue., 22 Apr. 0.0384 0.0344 0.0362
04:01-05:00, Tue., 22 Apr. 0.0398 0.0340 0.0359
03:01-04:00, Tue., 22 Apr. 0.0377 0.0344 0.0358
02:01-03:00, Tue., 22 Apr. 0.0373 0.0330 0.0357
01:01-02:00, Tue., 22 Apr. 0.0379 0.0341 0.0360
00:01-01:00, Tue., 22 Apr. 0.0384 0.0335 0.0359
23:01-24:00, Mon., 21 Apr. 0.0399 0.0335 0.0361
22:01-23:00, Mon., 21 Apr. 0.0398 0.0343 0.0357
21:01-22:00, Mon., 21 Apr. 0.0382 0.0341 0.0360
20:01-21:00, Mon., 21 Apr. 0.0392 0.0342 0.0360
19:01-20:00, Mon., 21 Apr. 0.0395 0.0341 0.0359
18:01-19:00, Mon., 21 Apr. 0.0406 0.0340 0.0361
17:01-18:00, Mon., 21 Apr. 0.0398 0.0340 0.0362
16:01-17:00, Mon., 21 Apr. 0.0396 0.0341 0.0360
15:01-16:00, Mon., 21 Apr. 0.0379 0.0342 0.0361
14:01-15:00, Mon., 21 Apr. 0.0377 0.0333 0.0358
13:01-14:00, Mon., 21 Apr. 0.0380 0.0333 0.0359
12:01-13:00, Mon., 21 Apr. 0.0380 0.0343 0.0359
11:01-12:00, Mon., 21 Apr. 0.0386 0.0343 0.0363
10:01-11:00, Mon., 21 Apr. 0.0386 0.0336 0.0362
09:01-10:00, Mon., 21 Apr. 0.0385 0.0339 0.0359
08:01-09:00, Mon., 21 Apr. 0.0393 0.0344 0.0360
07:01-08:00, Mon., 21 Apr. 0.0393 0.0338 0.0360
06:01-07:00, Mon., 21 Apr. 0.0388 0.0340 0.0361
05:01-06:00, Mon., 21 Apr. 0.0380 0.0335 0.0359
04:01-05:00, Mon., 21 Apr. 0.0395 0.0339 0.0359
03:01-04:00, Mon., 21 Apr. 0.0388 0.0334 0.0362
02:01-03:00, Mon., 21 Apr. 0.0396 0.0343 0.0362
01:01-02:00, Mon., 21 Apr. 0.0387 0.0337 0.0360
00:01-01:00, Mon., 21 Apr. 0.0392 0.0335 0.0359
23:01-24:00, Sun., 20 Apr. 0.0406 0.0330 0.0360
22:01-23:00, Sun., 20 Apr. 0.0371 0.0339 0.0358
21:01-22:00, Sun., 20 Apr. 0.0375 0.0333 0.0358
20:01-21:00, Sun., 20 Apr. 0.0374 0.0342 0.0357
19:01-20:00, Sun., 20 Apr. 0.0375 0.0336 0.0358
18:01-19:00, Sun., 20 Apr. 0.0379 0.0337 0.0358
17:01-18:00, Sun., 20 Apr. 0.0380 0.0327 0.0357
16:01-17:00, Sun., 20 Apr. 0.0386 0.0333 0.0357
15:01-16:00, Sun., 20 Apr. 0.0371 0.0337 0.0356
14:01-15:00, Sun., 20 Apr. 0.0370 0.0336 0.0355
13:01-14:00, Sun., 20 Apr. 0.0390 0.0337 0.0359
12:01-13:00, Sun., 20 Apr. 0.0396 0.0328 0.0357
11:01-12:00, Sun., 20 Apr. 0.0397 0.0336 0.0360
10:01-11:00, Sun., 20 Apr. 0.0396 0.0342 0.0361
09:01-10:00, Sun., 20 Apr. 0.0387 0.0339 0.0359
08:01-09:00, Sun., 20 Apr. 0.0386 0.0329 0.0358
07:01-08:00, Sun., 20 Apr. 0.0383 0.0324 0.0356
06:01-07:00, Sun., 20 Apr. 0.0408 0.0327 0.0357
05:01-06:00, Sun., 20 Apr. 0.0374 0.0335 0.0356
04:01-05:00, Sun., 20 Apr. 0.0380 0.0334 0.0357
03:01-04:00, Sun., 20 Apr. 0.0386 0.0339 0.0358
02:01-03:00, Sun., 20 Apr. 0.0379 0.0340 0.0359
01:01-02:00, Sun., 20 Apr. 0.0375 0.0340 0.0359
00:01-01:00, Sun., 20 Apr. 0.0399 0.0331 0.0362
23:01-24:00, Sat., 19 Apr. 0.0394 0.0343 0.0361
22:01-23:00, Sat., 19 Apr. 0.0407 0.0337 0.0362
21:01-22:00, Sat., 19 Apr. 0.0374 0.0337 0.0360
20:01-21:00, Sat., 19 Apr. 0.0390 0.0333 0.0358
19:01-20:00, Sat., 19 Apr. 0.0387 0.0341 0.0361
18:01-19:00, Sat., 19 Apr. 0.0385 0.0334 0.0360
17:01-18:00, Sat., 19 Apr. 0.0399 0.0343 0.0362
16:01-17:00, Sat., 19 Apr. 0.0389 0.0341 0.0360
15:01-16:00, Sat., 19 Apr. 0.0380 0.0338 0.0359
14:01-15:00, Sat., 19 Apr. 0.0390 0.0340 0.0360
13:01-14:00, Sat., 19 Apr. 0.0387 0.0329 0.0359
12:01-13:00, Sat., 19 Apr. 0.0385 0.0347 0.0361
11:01-12:00, Sat., 19 Apr. 0.0387 0.0338 0.0361
10:01-11:00, Sat., 19 Apr. 0.0391 0.0328 0.0360
09:01-10:00, Sat., 19 Apr. 0.0389 0.0335 0.0365
08:01-09:00, Sat., 19 Apr. 0.0399 0.0350 0.0370
07:01-08:00, Sat., 19 Apr. 0.0400 0.0348 0.0366
06:01-07:00, Sat., 19 Apr. 0.0381 0.0341 0.0362
05:01-06:00, Sat., 19 Apr. 0.0392 0.0342 0.0362
04:01-05:00, Sat., 19 Apr. 0.0375 0.0340 0.0356
03:01-04:00, Sat., 19 Apr. 0.0388 0.0341 0.0358
02:01-03:00, Sat., 19 Apr. 0.0387 0.0333 0.0359
01:01-02:00, Sat., 19 Apr. 0.0380 0.0339 0.0357
00:01-01:00, Sat., 19 Apr. 0.0394 0.0334 0.0360
23:01-24:00, Fri., 18 Apr. 0.0374 0.0341 0.0358
22:01-23:00, Fri., 18 Apr. 0.0382 0.0332 0.0357
21:01-22:00, Fri., 18 Apr. 0.0413 0.0341 0.0359
20:01-21:00, Fri., 18 Apr. 0.0381 0.0337 0.0359
19:01-20:00, Fri., 18 Apr. 0.0390 0.0337 0.0358
18:01-19:00, Fri., 18 Apr. 0.0393 0.0339 0.0356
17:01-18:00, Fri., 18 Apr. 0.0385 0.0339 0.0361
16:01-17:00, Fri., 18 Apr. 0.0378 0.0341 0.0358
15:01-16:00, Fri., 18 Apr. 0.0389 0.0333 0.0355
14:01-15:00, Fri., 18 Apr. 0.0372 0.0340 0.0356
13:01-14:00, Fri., 18 Apr. 0.0387 0.0333 0.0355
12:01-13:00, Fri., 18 Apr. 0.0376 0.0331 0.0354
11:01-12:00, Fri., 18 Apr. 0.0389 0.0339 0.0360
10:01-11:00, Fri., 18 Apr. 0.0415 0.0345 0.0365
09:01-10:00, Fri., 18 Apr. 0.0409 0.0343 0.0370
08:01-09:00, Fri., 18 Apr. 0.0407 0.0345 0.0369
07:01-08:00, Fri., 18 Apr. 0.0400 0.0347 0.0368
06:01-07:00, Fri., 18 Apr. 0.0401 0.0342 0.0366
05:01-06:00, Fri., 18 Apr. 0.0415 0.0343 0.0369
04:01-05:00, Fri., 18 Apr. 0.0397 0.0346 0.0367
03:01-04:00, Fri., 18 Apr. 0.0394 0.0345 0.0364
02:01-03:00, Fri., 18 Apr. 0.0399 0.0341 0.0365
01:01-02:00, Fri., 18 Apr. 0.0387 0.0333 0.0363
00:01-01:00, Fri., 18 Apr. 0.0385 0.0343 0.0361
23:01-24:00, Thu., 17 Apr. 0.0377 0.0336 0.0359
22:01-23:00, Thu., 17 Apr. 0.0395 0.0339 0.0358
21:01-22:00, Thu., 17 Apr. 0.0395 0.0338 0.0359
20:01-21:00, Thu., 17 Apr. 0.0389 0.0340 0.0361
19:01-20:00, Thu., 17 Apr. 0.0371 0.0338 0.0357
18:01-19:00, Thu., 17 Apr. 0.0393 0.0343 0.0362
17:01-18:00, Thu., 17 Apr. 0.0386 0.0340 0.0358
16:01-17:00, Thu., 17 Apr. 0.0385 0.0345 0.0360
15:01-16:00, Thu., 17 Apr. 0.0380 0.0337 0.0356
14:01-15:00, Thu., 17 Apr. 0.0383 0.0336 0.0360
13:01-14:00, Thu., 17 Apr. 0.0384 0.0340 0.0361
12:01-13:00, Thu., 17 Apr. 0.0392 0.0332 0.0359
11:01-12:00, Thu., 17 Apr. 0.0381 0.0334 0.0359
10:01-11:00, Thu., 17 Apr. 0.0389 0.0338 0.0362
09:01-10:00, Thu., 17 Apr. 0.0396 0.0341 0.0363
08:01-09:00, Thu., 17 Apr. 0.0406 0.0348 0.0368
07:01-08:00, Thu., 17 Apr. 0.0395 0.0341 0.0364
06:01-07:00, Thu., 17 Apr. 0.0396 0.0341 0.0362
05:01-06:00, Thu., 17 Apr. 0.0387 0.0337 0.0364
04:01-05:00, Thu., 17 Apr. 0.0392 0.0334 0.0356
03:01-04:00, Thu., 17 Apr. 0.0379 0.0334 0.0358
02:01-03:00, Thu., 17 Apr. 0.0378 0.0335 0.0355
01:01-02:00, Thu., 17 Apr. 0.0381 0.0337 0.0356
00:01-01:00, Thu., 17 Apr. 0.0378 0.0328 0.0355
23:01-24:00, Wed., 16 Apr. 0.0392 0.0333 0.0356
22:01-23:00, Wed., 16 Apr. 0.0372 0.0340 0.0356
21:01-22:00, Wed., 16 Apr. 0.0384 0.0338 0.0358
20:01-21:00, Wed., 16 Apr. 0.0372 0.0328 0.0356
19:01-20:00, Wed., 16 Apr. 0.0380 0.0337 0.0358
18:01-19:00, Wed., 16 Apr. 0.0371 0.0338 0.0356
17:01-18:00, Wed., 16 Apr. 0.0386 0.0341 0.0361
16:01-17:00, Wed., 16 Apr. 0.0382 0.0340 0.0361
15:01-16:00, Wed., 16 Apr. 0.0392 0.0338 0.0363
14:01-15:00, Wed., 16 Apr. 0.0388 0.0334 0.0361
13:01-14:00, Wed., 16 Apr. 0.0401 0.0339 0.0361