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
11:01-12:00, Fri., 11 Sep. 0.0393 0.0330 0.0358
10:01-11:00, Fri., 11 Sep. 0.0413 0.0344 0.0372
09:01-10:00, Fri., 11 Sep. 0.0415 0.0358 0.0388
08:01-09:00, Fri., 11 Sep. 0.0439 0.0367 0.0405
07:01-08:00, Fri., 11 Sep. 0.0452 0.0389 0.0420
06:01-07:00, Fri., 11 Sep. 0.0481 0.0391 0.0445
05:01-06:00, Fri., 11 Sep. 0.0482 0.0380 0.0424
04:01-05:00, Fri., 11 Sep. 0.0416 0.0360 0.0379
03:01-04:00, Fri., 11 Sep. 0.0404 0.0352 0.0369
02:01-03:00, Fri., 11 Sep. 0.0388 0.0342 0.0358
01:01-02:00, Fri., 11 Sep. 0.0405 0.0351 0.0366
00:01-01:00, Fri., 11 Sep. 0.0439 0.0359 0.0395
23:01-24:00, Thu., 10 Sep. 0.0446 0.0367 0.0411
22:01-23:00, Thu., 10 Sep. 0.0452 0.0373 0.0422
21:01-22:00, Thu., 10 Sep. 0.0431 0.0339 0.0371
20:01-21:00, Thu., 10 Sep. 0.0388 0.0344 0.0362
19:01-20:00, Thu., 10 Sep. 0.0452 0.0357 0.0401
18:01-19:00, Thu., 10 Sep. 0.0471 0.0396 0.0436
17:01-18:00, Thu., 10 Sep. 0.0467 0.0362 0.0413
16:01-17:00, Thu., 10 Sep. 0.0394 0.0340 0.0359
15:01-16:00, Thu., 10 Sep. 0.0386 0.0342 0.0361
14:01-15:00, Thu., 10 Sep. 0.0381 0.0337 0.0358
13:01-14:00, Thu., 10 Sep. 0.0399 0.0342 0.0361
12:01-13:00, Thu., 10 Sep. 0.0386 0.0335 0.0360
11:01-12:00, Thu., 10 Sep. 0.0397 0.0331 0.0359
10:01-11:00, Thu., 10 Sep. 0.0407 0.0339 0.0367
09:01-10:00, Thu., 10 Sep. 0.0427 0.0354 0.0389
08:01-09:00, Thu., 10 Sep. 0.0404 0.0349 0.0370
07:01-08:00, Thu., 10 Sep. 0.0405 0.0342 0.0372
06:01-07:00, Thu., 10 Sep. 0.0380 0.0331 0.0358
05:01-06:00, Thu., 10 Sep. 0.0378 0.0335 0.0356
04:01-05:00, Thu., 10 Sep. 0.0397 0.0334 0.0362
03:01-04:00, Thu., 10 Sep. 0.0436 0.0359 0.0394
02:01-03:00, Thu., 10 Sep. 0.0488 0.0405 0.0451
01:01-02:00, Thu., 10 Sep. 0.0498 0.0424 0.0457
00:01-01:00, Thu., 10 Sep. 0.0500 0.0409 0.0458
23:01-24:00, Wed., 09 Sep. 0.0548 0.0416 0.0482
22:01-23:00, Wed., 09 Sep. 0.0543 0.0445 0.0490
21:01-22:00, Wed., 09 Sep. 0.0494 0.0408 0.0449
20:01-21:00, Wed., 09 Sep. 0.0505 0.0410 0.0459
19:01-20:00, Wed., 09 Sep. 0.0463 0.0343 0.0383
18:01-19:00, Wed., 09 Sep. 0.0406 0.0355 0.0372
17:01-18:00, Wed., 09 Sep. 0.0412 0.0344 0.0376
16:01-17:00, Wed., 09 Sep. 0.0413 0.0348 0.0372
15:01-16:00, Wed., 09 Sep. 0.0424 0.0361 0.0383
14:01-15:00, Wed., 09 Sep. 0.0396 0.0328 0.0356
13:01-14:00, Wed., 09 Sep. 0.0371 0.0325 0.0349
12:01-13:00, Wed., 09 Sep. 0.0368 0.0324 0.0348
11:01-12:00, Wed., 09 Sep. 0.0369 0.0332 0.0351
10:01-11:00, Wed., 09 Sep. 0.0369 0.0324 0.0349
09:01-10:00, Wed., 09 Sep. 0.0365 0.0334 0.0348
08:01-09:00, Wed., 09 Sep. 0.0372 0.0334 0.0350
07:01-08:00, Wed., 09 Sep. 0.0371 0.0327 0.0350
06:01-07:00, Wed., 09 Sep. 0.0390 0.0328 0.0351
05:01-06:00, Wed., 09 Sep. 0.0388 0.0330 0.0354
04:01-05:00, Wed., 09 Sep. 0.0384 0.0335 0.0357
03:01-04:00, Wed., 09 Sep. 0.0403 0.0345 0.0368
02:01-03:00, Wed., 09 Sep. 0.0407 0.0343 0.0367
01:01-02:00, Wed., 09 Sep. 0.0431 0.0346 0.0386
00:01-01:00, Wed., 09 Sep. 0.0513 0.0392 0.0457
23:01-24:00, Tue., 08 Sep. 0.0525 0.0378 0.0464
22:01-23:00, Tue., 08 Sep. 0.0422 0.0341 0.0369
21:01-22:00, Tue., 08 Sep. 0.0426 0.0355 0.0381
20:01-21:00, Tue., 08 Sep. 0.0463 0.0365 0.0394
19:01-20:00, Tue., 08 Sep. 0.0376 0.0325 0.0353
18:01-19:00, Tue., 08 Sep. 0.0374 0.0331 0.0355
17:01-18:00, Tue., 08 Sep. 0.0390 0.0338 0.0364
16:01-17:00, Tue., 08 Sep. 0.0448 0.0358 0.0393
15:01-16:00, Tue., 08 Sep. 0.0460 0.0380 0.0421
14:01-15:00, Tue., 08 Sep. 0.0421 0.0326 0.0370
13:01-14:00, Tue., 08 Sep. 0.0378 0.0322 0.0354
12:01-13:00, Tue., 08 Sep. 0.0379 0.0329 0.0351
11:01-12:00, Tue., 08 Sep. 0.0369 0.0334 0.0350
10:01-11:00, Tue., 08 Sep. 0.0367 0.0329 0.0352
09:01-10:00, Tue., 08 Sep. 0.0369 0.0324 0.0350
08:01-09:00, Tue., 08 Sep. 0.0372 0.0338 0.0353
07:01-08:00, Tue., 08 Sep. 0.0393 0.0329 0.0357
06:01-07:00, Tue., 08 Sep. 0.0388 0.0334 0.0355
05:01-06:00, Tue., 08 Sep. 0.0371 0.0334 0.0356
04:01-05:00, Tue., 08 Sep. 0.0399 0.0337 0.0363
03:01-04:00, Tue., 08 Sep. 0.0419 0.0358 0.0384
02:01-03:00, Tue., 08 Sep. 0.0399 0.0332 0.0362
01:01-02:00, Tue., 08 Sep. 0.0375 0.0334 0.0352
00:01-01:00, Tue., 08 Sep. 0.0389 0.0324 0.0351
23:01-24:00, Mon., 07 Sep. 0.0379 0.0336 0.0352
22:01-23:00, Mon., 07 Sep. 0.0375 0.0329 0.0351
21:01-22:00, Mon., 07 Sep. 0.0373 0.0330 0.0352
20:01-21:00, Mon., 07 Sep. 0.0389 0.0333 0.0354
19:01-20:00, Mon., 07 Sep. 0.0378 0.0334 0.0354
18:01-19:00, Mon., 07 Sep. 0.0396 0.0341 0.0363
17:01-18:00, Mon., 07 Sep. 0.0436 0.0361 0.0393
16:01-17:00, Mon., 07 Sep. 0.0464 0.0389 0.0422
15:01-16:00, Mon., 07 Sep. 0.0441 0.0359 0.0397
14:01-15:00, Mon., 07 Sep. 0.0436 0.0366 0.0401
13:01-14:00, Mon., 07 Sep. 0.0414 0.0354 0.0382
12:01-13:00, Mon., 07 Sep. 0.0400 0.0355 0.0373
11:01-12:00, Mon., 07 Sep. 0.0415 0.0339 0.0367
10:01-11:00, Mon., 07 Sep. 0.0407 0.0343 0.0367
09:01-10:00, Mon., 07 Sep. 0.0412 0.0349 0.0373
08:01-09:00, Mon., 07 Sep. 0.0444 0.0362 0.0398
07:01-08:00, Mon., 07 Sep. 0.0436 0.0369 0.0400
06:01-07:00, Mon., 07 Sep. 0.0495 0.0385 0.0439
05:01-06:00, Mon., 07 Sep. 0.0517 0.0435 0.0475
04:01-05:00, Mon., 07 Sep. 0.0476 0.0397 0.0441
03:01-04:00, Mon., 07 Sep. 0.0471 0.0389 0.0436
02:01-03:00, Mon., 07 Sep. 0.0487 0.0426 0.0454
01:01-02:00, Mon., 07 Sep. 0.0493 0.0406 0.0450
00:01-01:00, Mon., 07 Sep. 0.0474 0.0400 0.0433
23:01-24:00, Sun., 06 Sep. 0.0463 0.0386 0.0419
22:01-23:00, Sun., 06 Sep. 0.0458 0.0379 0.0416
21:01-22:00, Sun., 06 Sep. 0.0446 0.0367 0.0410
20:01-21:00, Sun., 06 Sep. 0.0443 0.0369 0.0404
19:01-20:00, Sun., 06 Sep. 0.0462 0.0387 0.0421
18:01-19:00, Sun., 06 Sep. 0.0456 0.0382 0.0428
17:01-18:00, Sun., 06 Sep. 0.0460 0.0383 0.0427
16:01-17:00, Sun., 06 Sep. 0.0482 0.0400 0.0434
15:01-16:00, Sun., 06 Sep. 0.0461 0.0395 0.0435
14:01-15:00, Sun., 06 Sep. 0.0480 0.0409 0.0441
13:01-14:00, Sun., 06 Sep. 0.0497 0.0432 0.0457
12:01-13:00, Sun., 06 Sep. 0.0512 0.0431 0.0475
11:01-12:00, Sun., 06 Sep. 0.0519 0.0443 0.0480
10:01-11:00, Sun., 06 Sep. 0.0507 0.0421 0.0470
09:01-10:00, Sun., 06 Sep. 0.0495 0.0425 0.0458
08:01-09:00, Sun., 06 Sep. 0.0526 0.0441 0.0484
07:01-08:00, Sun., 06 Sep. 0.0510 0.0420 0.0463
06:01-07:00, Sun., 06 Sep. 0.0465 0.0365 0.0412
05:01-06:00, Sun., 06 Sep. 0.0410 0.0344 0.0373
04:01-05:00, Sun., 06 Sep. 0.0394 0.0333 0.0358
03:01-04:00, Sun., 06 Sep. 0.0377 0.0333 0.0357
02:01-03:00, Sun., 06 Sep. 0.0382 0.0337 0.0356
01:01-02:00, Sun., 06 Sep. 0.0375 0.0334 0.0356
00:01-01:00, Sun., 06 Sep. 0.0374 0.0337 0.0355
23:01-24:00, Sat., 05 Sep. 0.0390 0.0333 0.0356
22:01-23:00, Sat., 05 Sep. 0.0386 0.0332 0.0352
21:01-22:00, Sat., 05 Sep. 0.0366 0.0335 0.0350
20:01-21:00, Sat., 05 Sep. 0.0394 0.0332 0.0357
19:01-20:00, Sat., 05 Sep. 0.0362 0.0328 0.0349
18:01-19:00, Sat., 05 Sep. 0.0380 0.0335 0.0355
17:01-18:00, Sat., 05 Sep. 0.0377 0.0333 0.0355
16:01-17:00, Sat., 05 Sep. 0.0383 0.0337 0.0357
15:01-16:00, Sat., 05 Sep. 0.0376 0.0329 0.0354
14:01-15:00, Sat., 05 Sep. 0.0376 0.0329 0.0354
13:01-14:00, Sat., 05 Sep. 0.0380 0.0337 0.0354
12:01-13:00, Sat., 05 Sep. 0.0390 0.0335 0.0357
11:01-12:00, Sat., 05 Sep. 0.0388 0.0341 0.0361
10:01-11:00, Sat., 05 Sep. 0.0399 0.0346 0.0370
09:01-10:00, Sat., 05 Sep. 0.0394 0.0339 0.0360
08:01-09:00, Sat., 05 Sep. 0.0415 0.0339 0.0370
07:01-08:00, Sat., 05 Sep. 0.0429 0.0360 0.0394
06:01-07:00, Sat., 05 Sep. 0.0433 0.0366 0.0403
05:01-06:00, Sat., 05 Sep. 0.0453 0.0365 0.0414
04:01-05:00, Sat., 05 Sep. 0.0429 0.0362 0.0390
03:01-04:00, Sat., 05 Sep. 0.0414 0.0358 0.0379
02:01-03:00, Sat., 05 Sep. 0.0408 0.0349 0.0377
01:01-02:00, Sat., 05 Sep. 0.0409 0.0351 0.0373
00:01-01:00, Sat., 05 Sep. 0.0400 0.0335 0.0373
23:01-24:00, Fri., 04 Sep. 0.0406 0.0357 0.0378
22:01-23:00, Fri., 04 Sep. 0.0397 0.0352 0.0372
21:01-22:00, Fri., 04 Sep. 0.0395 0.0351 0.0367
20:01-21:00, Fri., 04 Sep. 0.0402 0.0352 0.0373
19:01-20:00, Fri., 04 Sep. 0.0408 0.0354 0.0371
18:01-19:00, Fri., 04 Sep. 0.0404 0.0342 0.0366
17:01-18:00, Fri., 04 Sep. 0.0391 0.0342 0.0366
16:01-17:00, Fri., 04 Sep. 0.0397 0.0350 0.0369
15:01-16:00, Fri., 04 Sep. 0.0407 0.0345 0.0366
14:01-15:00, Fri., 04 Sep. 0.0407 0.0328 0.0362
13:01-14:00, Fri., 04 Sep. 0.0403 0.0339 0.0363
12:01-13:00, Fri., 04 Sep. 0.0397 0.0348 0.0366
11:01-12:00, Fri., 04 Sep. 0.0410 0.0345 0.0370
10:01-11:00, Fri., 04 Sep. 0.0398 0.0341 0.0366
09:01-10:00, Fri., 04 Sep. 0.0391 0.0330 0.0360
08:01-09:00, Fri., 04 Sep. 0.0407 0.0343 0.0365
07:01-08:00, Fri., 04 Sep. 0.0388 0.0325 0.0364
06:01-07:00, Fri., 04 Sep. 0.0408 0.0344 0.0368
05:01-06:00, Fri., 04 Sep. 0.0398 0.0344 0.0366
04:01-05:00, Fri., 04 Sep. 0.0397 0.0339 0.0363
03:01-04:00, Fri., 04 Sep. 0.0384 0.0332 0.0359
02:01-03:00, Fri., 04 Sep. 0.0382 0.0342 0.0359
01:01-02:00, Fri., 04 Sep. 0.0390 0.0329 0.0357
00:01-01:00, Fri., 04 Sep. 0.0388 0.0340 0.0362
23:01-24:00, Thu., 03 Sep. 0.0393 0.0343 0.0359
22:01-23:00, Thu., 03 Sep. 0.0373 0.0332 0.0358
21:01-22:00, Thu., 03 Sep. 0.0389 0.0333 0.0356
20:01-21:00, Thu., 03 Sep. 0.0378 0.0335 0.0354
19:01-20:00, Thu., 03 Sep. 0.0384 0.0339 0.0358
18:01-19:00, Thu., 03 Sep. 0.0393 0.0335 0.0357
17:01-18:00, Thu., 03 Sep. 0.0373 0.0332 0.0355
16:01-17:00, Thu., 03 Sep. 0.0391 0.0332 0.0357
15:01-16:00, Thu., 03 Sep. 0.0414 0.0332 0.0363
14:01-15:00, Thu., 03 Sep. 0.0381 0.0343 0.0362
13:01-14:00, Thu., 03 Sep. 0.0379 0.0331 0.0355
12:01-13:00, Thu., 03 Sep. 0.0388 0.0331 0.0358
11:01-12:00, Thu., 03 Sep. 0.0380 0.0331 0.0357
10:01-11:00, Thu., 03 Sep. 0.0394 0.0338 0.0356
09:01-10:00, Thu., 03 Sep. 0.0382 0.0336 0.0358
08:01-09:00, Thu., 03 Sep. 0.0374 0.0335 0.0356
07:01-08:00, Thu., 03 Sep. 0.0381 0.0329 0.0355
06:01-07:00, Thu., 03 Sep. 0.0379 0.0343 0.0360
05:01-06:00, Thu., 03 Sep. 0.0382 0.0334 0.0357
04:01-05:00, Thu., 03 Sep. 0.0372 0.0337 0.0355
03:01-04:00, Thu., 03 Sep. 0.0375 0.0333 0.0357
02:01-03:00, Thu., 03 Sep. 0.0383 0.0336 0.0355
01:01-02:00, Thu., 03 Sep. 0.0378 0.0341 0.0357
00:01-01:00, Thu., 03 Sep. 0.0376 0.0331 0.0354
23:01-24:00, Wed., 02 Sep. 0.0372 0.0340 0.0356
22:01-23:00, Wed., 02 Sep. 0.0374 0.0341 0.0357
21:01-22:00, Wed., 02 Sep. 0.0374 0.0339 0.0356
20:01-21:00, Wed., 02 Sep. 0.0377 0.0334 0.0354
19:01-20:00, Wed., 02 Sep. 0.0379 0.0335 0.0357
18:01-19:00, Wed., 02 Sep. 0.0378 0.0327 0.0355
17:01-18:00, Wed., 02 Sep. 0.0394 0.0329 0.0358
16:01-17:00, Wed., 02 Sep. 0.0392 0.0338 0.0356
15:01-16:00, Wed., 02 Sep. 0.0381 0.0339 0.0358
14:01-15:00, Wed., 02 Sep. 0.0377 0.0332 0.0356
13:01-14:00, Wed., 02 Sep. 0.0395 0.0335 0.0358
12:01-13:00, Wed., 02 Sep. 0.0381 0.0331 0.0355
11:01-12:00, Wed., 02 Sep. 0.0392 0.0331 0.0355
10:01-11:00, Wed., 02 Sep. 0.0380 0.0339 0.0358
09:01-10:00, Wed., 02 Sep. 0.0383 0.0336 0.0359
08:01-09:00, Wed., 02 Sep. 0.0378 0.0333 0.0355
07:01-08:00, Wed., 02 Sep. 0.0379 0.0342 0.0358
06:01-07:00, Wed., 02 Sep. 0.0387 0.0326 0.0359
05:01-06:00, Wed., 02 Sep. 0.0377 0.0336 0.0358
04:01-05:00, Wed., 02 Sep. 0.0400 0.0332 0.0357
03:01-04:00, Wed., 02 Sep. 0.0375 0.0334 0.0355
02:01-03:00, Wed., 02 Sep. 0.0375 0.0337 0.0354
01:01-02:00, Wed., 02 Sep. 0.0397 0.0335 0.0357
00:01-01:00, Wed., 02 Sep. 0.0385 0.0334 0.0355
23:01-24:00, Tue., 01 Sep. 0.0379 0.0335 0.0356
22:01-23:00, Tue., 01 Sep. 0.0384 0.0329 0.0356
21:01-22:00, Tue., 01 Sep. 0.0386 0.0333 0.0352
20:01-21:00, Tue., 01 Sep. 0.0374 0.0330 0.0356
19:01-20:00, Tue., 01 Sep. 0.0372 0.0330 0.0353
18:01-19:00, Tue., 01 Sep. 0.0387 0.0326 0.0356
17:01-18:00, Tue., 01 Sep. 0.0373 0.0330 0.0353
16:01-17:00, Tue., 01 Sep. 0.0381 0.0332 0.0357
15:01-16:00, Tue., 01 Sep. 0.0377 0.0338 0.0354
14:01-15:00, Tue., 01 Sep. 0.0414 0.0326 0.0355
13:01-14:00, Tue., 01 Sep. 0.0371 0.0334 0.0354
12:01-13:00, Tue., 01 Sep. 0.0381 0.0325 0.0355