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
07:01-08:00, Fri., 02 Oct. 0.0388 0.0342 0.0361
06:01-07:00, Fri., 02 Oct. 0.0393 0.0345 0.0364
05:01-06:00, Fri., 02 Oct. 0.0399 0.0338 0.0361
04:01-05:00, Fri., 02 Oct. 0.0386 0.0339 0.0361
03:01-04:00, Fri., 02 Oct. 0.0384 0.0336 0.0360
02:01-03:00, Fri., 02 Oct. 0.0377 0.0330 0.0357
01:01-02:00, Fri., 02 Oct. 0.0385 0.0339 0.0359
00:01-01:00, Fri., 02 Oct. 0.0397 0.0333 0.0360
23:01-24:00, Thu., 01 Oct. 0.0375 0.0337 0.0360
22:01-23:00, Thu., 01 Oct. 0.0398 0.0341 0.0361
21:01-22:00, Thu., 01 Oct. 0.0402 0.0338 0.0362
20:01-21:00, Thu., 01 Oct. 0.0398 0.0338 0.0359
19:01-20:00, Thu., 01 Oct. 0.0381 0.0341 0.0360
18:01-19:00, Thu., 01 Oct. 0.0374 0.0332 0.0357
17:01-18:00, Thu., 01 Oct. 0.0380 0.0341 0.0358
16:01-17:00, Thu., 01 Oct. 0.0384 0.0335 0.0355
15:01-16:00, Thu., 01 Oct. 0.0377 0.0331 0.0354
14:01-15:00, Thu., 01 Oct. 0.0378 0.0338 0.0354
13:01-14:00, Thu., 01 Oct. 0.0378 0.0329 0.0354
12:01-13:00, Thu., 01 Oct. 0.0399 0.0341 0.0359
11:01-12:00, Thu., 01 Oct. 0.0389 0.0339 0.0355
10:01-11:00, Thu., 01 Oct. 0.0393 0.0340 0.0358
09:01-10:00, Thu., 01 Oct. 0.0401 0.0334 0.0360
08:01-09:00, Thu., 01 Oct. 0.0395 0.0331 0.0359
07:01-08:00, Thu., 01 Oct. 0.0390 0.0331 0.0360
06:01-07:00, Thu., 01 Oct. 0.0386 0.0331 0.0358
05:01-06:00, Thu., 01 Oct. 0.0396 0.0335 0.0358
04:01-05:00, Thu., 01 Oct. 0.0395 0.0338 0.0357
03:01-04:00, Thu., 01 Oct. 0.0386 0.0333 0.0359
02:01-03:00, Thu., 01 Oct. 0.0389 0.0334 0.0358
01:01-02:00, Thu., 01 Oct. 0.0389 0.0343 0.0359
00:01-01:00, Thu., 01 Oct. 0.0381 0.0337 0.0360
23:01-24:00, Wed., 30 Sep. 0.0406 0.0351 0.0369
22:01-23:00, Wed., 30 Sep. 0.0398 0.0337 0.0369
21:01-22:00, Wed., 30 Sep. 0.0426 0.0356 0.0378
20:01-21:00, Wed., 30 Sep. 0.0428 0.0357 0.0379
19:01-20:00, Wed., 30 Sep. 0.0431 0.0348 0.0383
18:01-19:00, Wed., 30 Sep. 0.0435 0.0361 0.0399
17:01-18:00, Wed., 30 Sep. 0.0434 0.0364 0.0396
16:01-17:00, Wed., 30 Sep. 0.0445 0.0356 0.0397
15:01-16:00, Wed., 30 Sep. 0.0379 0.0329 0.0361
14:01-15:00, Wed., 30 Sep. 0.0427 0.0347 0.0372
13:01-14:00, Wed., 30 Sep. 0.0401 0.0346 0.0368
12:01-13:00, Wed., 30 Sep. 0.0383 0.0342 0.0359
11:01-12:00, Wed., 30 Sep. 0.0389 0.0350 0.0367
10:01-11:00, Wed., 30 Sep. 0.0421 0.0355 0.0379
09:01-10:00, Wed., 30 Sep. 0.0450 0.0360 0.0413
08:01-09:00, Wed., 30 Sep. 0.0479 0.0409 0.0442
07:01-08:00, Wed., 30 Sep. 0.0432 0.0354 0.0382
06:01-07:00, Wed., 30 Sep. 0.0424 0.0355 0.0376
05:01-06:00, Wed., 30 Sep. 0.0509 0.0380 0.0432
04:01-05:00, Wed., 30 Sep. 0.0493 0.0424 0.0466
03:01-04:00, Wed., 30 Sep. 0.0498 0.0439 0.0465
02:01-03:00, Wed., 30 Sep. 0.0496 0.0426 0.0457
01:01-02:00, Wed., 30 Sep. 0.0502 0.0417 0.0453
00:01-01:00, Wed., 30 Sep. 0.0493 0.0427 0.0463
23:01-24:00, Tue., 29 Sep. 0.0485 0.0398 0.0443
22:01-23:00, Tue., 29 Sep. 0.0454 0.0391 0.0426
21:01-22:00, Tue., 29 Sep. 0.0449 0.0388 0.0420
20:01-21:00, Tue., 29 Sep. 0.0476 0.0402 0.0436
19:01-20:00, Tue., 29 Sep. 0.0487 0.0406 0.0441
18:01-19:00, Tue., 29 Sep. 0.0481 0.0418 0.0450
17:01-18:00, Tue., 29 Sep. 0.0498 0.0404 0.0438
16:01-17:00, Tue., 29 Sep. 0.0473 0.0397 0.0435
15:01-16:00, Tue., 29 Sep. 0.0467 0.0366 0.0413
14:01-15:00, Tue., 29 Sep. 0.0446 0.0377 0.0412
13:01-14:00, Tue., 29 Sep. 0.0470 0.0396 0.0427
12:01-13:00, Tue., 29 Sep. 0.0490 0.0411 0.0443
11:01-12:00, Tue., 29 Sep. 0.0474 0.0380 0.0423
10:01-11:00, Tue., 29 Sep. 0.0468 0.0391 0.0436
09:01-10:00, Tue., 29 Sep. 0.0485 0.0395 0.0439
08:01-09:00, Tue., 29 Sep. 0.0515 0.0432 0.0469
07:01-08:00, Tue., 29 Sep. 0.0548 0.0444 0.0494
06:01-07:00, Tue., 29 Sep. 0.0539 0.0370 0.0455
05:01-06:00, Tue., 29 Sep. 0.0417 0.0354 0.0385
04:01-05:00, Tue., 29 Sep. 0.0409 0.0352 0.0379
03:01-04:00, Tue., 29 Sep. 0.0412 0.0351 0.0369
02:01-03:00, Tue., 29 Sep. 0.0382 0.0345 0.0362
01:01-02:00, Tue., 29 Sep. 0.0409 0.0346 0.0368
00:01-01:00, Tue., 29 Sep. 0.0445 0.0350 0.0394
23:01-24:00, Mon., 28 Sep. 0.0476 0.0396 0.0441
22:01-23:00, Mon., 28 Sep. 0.0473 0.0361 0.0428
21:01-22:00, Mon., 28 Sep. 0.0410 0.0347 0.0370
20:01-21:00, Mon., 28 Sep. 0.0411 0.0353 0.0376
19:01-20:00, Mon., 28 Sep. 0.0390 0.0346 0.0365
18:01-19:00, Mon., 28 Sep. 0.0385 0.0338 0.0357
17:01-18:00, Mon., 28 Sep. 0.0381 0.0334 0.0357
16:01-17:00, Mon., 28 Sep. 0.0377 0.0334 0.0355
15:01-16:00, Mon., 28 Sep. 0.0378 0.0331 0.0355
14:01-15:00, Mon., 28 Sep. 0.0390 0.0335 0.0358
13:01-14:00, Mon., 28 Sep. 0.0381 0.0346 0.0361
12:01-13:00, Mon., 28 Sep. 0.0392 0.0331 0.0359
11:01-12:00, Mon., 28 Sep. 0.0421 0.0347 0.0379
10:01-11:00, Mon., 28 Sep. 0.0453 0.0391 0.0420
09:01-10:00, Mon., 28 Sep. 0.0558 0.0393 0.0475
08:01-09:00, Mon., 28 Sep. 0.0595 0.0486 0.0548
07:01-08:00, Mon., 28 Sep. 0.0620 0.0420 0.0549
06:01-07:00, Mon., 28 Sep. 0.0452 0.0336 0.0382
05:01-06:00, Mon., 28 Sep. 0.0387 0.0336 0.0357
04:01-05:00, Mon., 28 Sep. 0.0374 0.0333 0.0356
03:01-04:00, Mon., 28 Sep. 0.0391 0.0332 0.0356
02:01-03:00, Mon., 28 Sep. 0.0390 0.0338 0.0359
01:01-02:00, Mon., 28 Sep. 0.0382 0.0336 0.0362
00:01-01:00, Mon., 28 Sep. 0.0407 0.0336 0.0364
23:01-24:00, Sun., 27 Sep. 0.0422 0.0361 0.0388
22:01-23:00, Sun., 27 Sep. 0.0399 0.0341 0.0364
21:01-22:00, Sun., 27 Sep. 0.0393 0.0352 0.0370
20:01-21:00, Sun., 27 Sep. 0.0394 0.0337 0.0361
19:01-20:00, Sun., 27 Sep. 0.0390 0.0332 0.0358
18:01-19:00, Sun., 27 Sep. 0.0422 0.0331 0.0370
17:01-18:00, Sun., 27 Sep. 0.0412 0.0348 0.0376
16:01-17:00, Sun., 27 Sep. 0.0387 0.0334 0.0359
15:01-16:00, Sun., 27 Sep. 0.0388 0.0335 0.0357
14:01-15:00, Sun., 27 Sep. 0.0384 0.0341 0.0358
13:01-14:00, Sun., 27 Sep. 0.0384 0.0342 0.0359
12:01-13:00, Sun., 27 Sep. 0.0378 0.0330 0.0357
11:01-12:00, Sun., 27 Sep. 0.0385 0.0337 0.0356
10:01-11:00, Sun., 27 Sep. 0.0386 0.0334 0.0359
09:01-10:00, Sun., 27 Sep. 0.0376 0.0330 0.0357
08:01-09:00, Sun., 27 Sep. 0.0374 0.0335 0.0355
07:01-08:00, Sun., 27 Sep. 0.0400 0.0337 0.0357
06:01-07:00, Sun., 27 Sep. 0.0377 0.0340 0.0358
05:01-06:00, Sun., 27 Sep. 0.0383 0.0340 0.0359
04:01-05:00, Sun., 27 Sep. 0.0387 0.0351 0.0364
03:01-04:00, Sun., 27 Sep. 0.0400 0.0332 0.0367
02:01-03:00, Sun., 27 Sep. 0.0376 0.0331 0.0357
01:01-02:00, Sun., 27 Sep. 0.0382 0.0337 0.0361
00:01-01:00, Sun., 27 Sep. 0.0444 0.0354 0.0386
23:01-24:00, Sat., 26 Sep. 0.0436 0.0382 0.0411
22:01-23:00, Sat., 26 Sep. 0.0458 0.0374 0.0417
21:01-22:00, Sat., 26 Sep. 0.0414 0.0349 0.0378
20:01-21:00, Sat., 26 Sep. 0.0391 0.0343 0.0364
19:01-20:00, Sat., 26 Sep. 0.0392 0.0336 0.0361
18:01-19:00, Sat., 26 Sep. 0.0387 0.0334 0.0361
17:01-18:00, Sat., 26 Sep. 0.0396 0.0347 0.0369
16:01-17:00, Sat., 26 Sep. 0.0408 0.0350 0.0374
15:01-16:00, Sat., 26 Sep. 0.0465 0.0370 0.0410
14:01-15:00, Sat., 26 Sep. 0.0451 0.0341 0.0408
13:01-14:00, Sat., 26 Sep. 0.0400 0.0342 0.0358
12:01-13:00, Sat., 26 Sep. 0.0397 0.0346 0.0368
11:01-12:00, Sat., 26 Sep. 0.0412 0.0353 0.0369
10:01-11:00, Sat., 26 Sep. 0.0424 0.0351 0.0383
09:01-10:00, Sat., 26 Sep. 0.0457 0.0374 0.0420
08:01-09:00, Sat., 26 Sep. 0.0498 0.0421 0.0459
07:01-08:00, Sat., 26 Sep. 0.0486 0.0371 0.0420
06:01-07:00, Sat., 26 Sep. 0.0500 0.0370 0.0443
05:01-06:00, Sat., 26 Sep. 0.0523 0.0391 0.0464
04:01-05:00, Sat., 26 Sep. 0.0423 0.0343 0.0377
03:01-04:00, Sat., 26 Sep. 0.0411 0.0344 0.0371
02:01-03:00, Sat., 26 Sep. 0.0424 0.0358 0.0386
01:01-02:00, Sat., 26 Sep. 0.0436 0.0349 0.0379
00:01-01:00, Sat., 26 Sep. 0.0387 0.0326 0.0356
23:01-24:00, Fri., 25 Sep. 0.0379 0.0339 0.0354
22:01-23:00, Fri., 25 Sep. 0.0381 0.0333 0.0354
21:01-22:00, Fri., 25 Sep. 0.0375 0.0317 0.0352
20:01-21:00, Fri., 25 Sep. 0.0372 0.0336 0.0356
19:01-20:00, Fri., 25 Sep. 0.0396 0.0339 0.0356
18:01-19:00, Fri., 25 Sep. 0.0394 0.0336 0.0356
17:01-18:00, Fri., 25 Sep. 0.0396 0.0323 0.0354
16:01-17:00, Fri., 25 Sep. 0.0375 0.0331 0.0357
15:01-16:00, Fri., 25 Sep. 0.0385 0.0330 0.0358
14:01-15:00, Fri., 25 Sep. 0.0389 0.0338 0.0357
13:01-14:00, Fri., 25 Sep. 0.0370 0.0340 0.0357
12:01-13:00, Fri., 25 Sep. 0.0381 0.0326 0.0356
11:01-12:00, Fri., 25 Sep. 0.0373 0.0328 0.0352
10:01-11:00, Fri., 25 Sep. 0.0381 0.0328 0.0356
09:01-10:00, Fri., 25 Sep. 0.0379 0.0332 0.0355
08:01-09:00, Fri., 25 Sep. 0.0373 0.0329 0.0355
07:01-08:00, Fri., 25 Sep. 0.0372 0.0332 0.0355
06:01-07:00, Fri., 25 Sep. 0.0373 0.0336 0.0355
05:01-06:00, Fri., 25 Sep. 0.0398 0.0335 0.0358
04:01-05:00, Fri., 25 Sep. 0.0385 0.0335 0.0355
03:01-04:00, Fri., 25 Sep. 0.0384 0.0334 0.0359
02:01-03:00, Fri., 25 Sep. 0.0386 0.0344 0.0357
01:01-02:00, Fri., 25 Sep. 0.0383 0.0333 0.0356
00:01-01:00, Fri., 25 Sep. 0.0373 0.0341 0.0356
23:01-24:00, Thu., 24 Sep. 0.0368 0.0335 0.0355
22:01-23:00, Thu., 24 Sep. 0.0377 0.0336 0.0357
21:01-22:00, Thu., 24 Sep. 0.0401 0.0327 0.0358
20:01-21:00, Thu., 24 Sep. 0.0389 0.0337 0.0354
19:01-20:00, Thu., 24 Sep. 0.0375 0.0329 0.0355
18:01-19:00, Thu., 24 Sep. 0.0382 0.0329 0.0354
17:01-18:00, Thu., 24 Sep. 0.0398 0.0340 0.0359
16:01-17:00, Thu., 24 Sep. 0.0390 0.0334 0.0357
15:01-16:00, Thu., 24 Sep. 0.0377 0.0340 0.0357
14:01-15:00, Thu., 24 Sep. 0.0379 0.0326 0.0354
13:01-14:00, Thu., 24 Sep. 0.0394 0.0337 0.0356
12:01-13:00, Thu., 24 Sep. 0.0388 0.0336 0.0356
11:01-12:00, Thu., 24 Sep. 0.0390 0.0332 0.0354
10:01-11:00, Thu., 24 Sep. 0.0407 0.0328 0.0357
09:01-10:00, Thu., 24 Sep. 0.0378 0.0334 0.0355
08:01-09:00, Thu., 24 Sep. 0.0391 0.0332 0.0355
07:01-08:00, Thu., 24 Sep. 0.0373 0.0336 0.0355
06:01-07:00, Thu., 24 Sep. 0.0379 0.0338 0.0356
05:01-06:00, Thu., 24 Sep. 0.0388 0.0339 0.0357
04:01-05:00, Thu., 24 Sep. 0.0375 0.0327 0.0356
03:01-04:00, Thu., 24 Sep. 0.0373 0.0343 0.0355
02:01-03:00, Thu., 24 Sep. 0.0379 0.0325 0.0358
01:01-02:00, Thu., 24 Sep. 0.0369 0.0335 0.0355
00:01-01:00, Thu., 24 Sep. 0.0413 0.0333 0.0362
23:01-24:00, Wed., 23 Sep. 0.0413 0.0357 0.0381
22:01-23:00, Wed., 23 Sep. 0.0443 0.0379 0.0408
21:01-22:00, Wed., 23 Sep. 0.0440 0.0371 0.0409
20:01-21:00, Wed., 23 Sep. 0.0414 0.0353 0.0380
19:01-20:00, Wed., 23 Sep. 0.0401 0.0336 0.0373
18:01-19:00, Wed., 23 Sep. 0.0433 0.0358 0.0386
17:01-18:00, Wed., 23 Sep. 0.0446 0.0367 0.0406
16:01-17:00, Wed., 23 Sep. 0.0484 0.0371 0.0417
15:01-16:00, Wed., 23 Sep. 0.0528 0.0429 0.0471
14:01-15:00, Wed., 23 Sep. 0.0525 0.0445 0.0486
13:01-14:00, Wed., 23 Sep. 0.0532 0.0450 0.0488
12:01-13:00, Wed., 23 Sep. 0.0525 0.0450 0.0492
11:01-12:00, Wed., 23 Sep. 0.0512 0.0407 0.0450
10:01-11:00, Wed., 23 Sep. 0.0440 0.0352 0.0389
09:01-10:00, Wed., 23 Sep. 0.0393 0.0340 0.0362
08:01-09:00, Wed., 23 Sep. 0.0378 0.0334 0.0356
07:01-08:00, Wed., 23 Sep. 0.0383 0.0332 0.0354
06:01-07:00, Wed., 23 Sep. 0.0389 0.0345 0.0359
05:01-06:00, Wed., 23 Sep. 0.0384 0.0329 0.0353
04:01-05:00, Wed., 23 Sep. 0.0385 0.0337 0.0355
03:01-04:00, Wed., 23 Sep. 0.0391 0.0336 0.0357
02:01-03:00, Wed., 23 Sep. 0.0390 0.0339 0.0356
01:01-02:00, Wed., 23 Sep. 0.0373 0.0335 0.0354
00:01-01:00, Wed., 23 Sep. 0.0377 0.0331 0.0356
23:01-24:00, Tue., 22 Sep. 0.0377 0.0335 0.0355
22:01-23:00, Tue., 22 Sep. 0.0380 0.0332 0.0354
21:01-22:00, Tue., 22 Sep. 0.0387 0.0339 0.0357
20:01-21:00, Tue., 22 Sep. 0.0377 0.0336 0.0355
19:01-20:00, Tue., 22 Sep. 0.0383 0.0339 0.0355
18:01-19:00, Tue., 22 Sep. 0.0386 0.0336 0.0358
17:01-18:00, Tue., 22 Sep. 0.0397 0.0339 0.0355
16:01-17:00, Tue., 22 Sep. 0.0370 0.0340 0.0356
15:01-16:00, Tue., 22 Sep. 0.0393 0.0331 0.0356
14:01-15:00, Tue., 22 Sep. 0.0372 0.0321 0.0353
13:01-14:00, Tue., 22 Sep. 0.0387 0.0336 0.0355
12:01-13:00, Tue., 22 Sep. 0.0379 0.0332 0.0351
11:01-12:00, Tue., 22 Sep. 0.0376 0.0337 0.0355
10:01-11:00, Tue., 22 Sep. 0.0376 0.0332 0.0356
09:01-10:00, Tue., 22 Sep. 0.0381 0.0330 0.0355
08:01-09:00, Tue., 22 Sep. 0.0376 0.0329 0.0352