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
16:01-17:00, Mon., 18 Aug. 0.0371 0.0338 0.0355
15:01-16:00, Mon., 18 Aug. 0.0393 0.0321 0.0358
14:01-15:00, Mon., 18 Aug. 0.0388 0.0336 0.0356
13:01-14:00, Mon., 18 Aug. 0.0374 0.0339 0.0359
12:01-13:00, Mon., 18 Aug. 0.0391 0.0337 0.0360
11:01-12:00, Mon., 18 Aug. 0.0403 0.0339 0.0362
10:01-11:00, Mon., 18 Aug. 0.0401 0.0347 0.0365
09:01-10:00, Mon., 18 Aug. 0.0388 0.0341 0.0365
08:01-09:00, Mon., 18 Aug. 0.0381 0.0344 0.0361
07:01-08:00, Mon., 18 Aug. 0.0401 0.0334 0.0366
06:01-07:00, Mon., 18 Aug. 0.0391 0.0333 0.0363
05:01-06:00, Mon., 18 Aug. 0.0379 0.0343 0.0361
04:01-05:00, Mon., 18 Aug. 0.0376 0.0337 0.0359
03:01-04:00, Mon., 18 Aug. 0.0380 0.0336 0.0359
02:01-03:00, Mon., 18 Aug. 0.0389 0.0336 0.0359
01:01-02:00, Mon., 18 Aug. 0.0385 0.0336 0.0358
00:01-01:00, Mon., 18 Aug. 0.0384 0.0339 0.0359
23:01-24:00, Sun., 17 Aug. 0.0392 0.0335 0.0359
22:01-23:00, Sun., 17 Aug. 0.0389 0.0335 0.0358
21:01-22:00, Sun., 17 Aug. 0.0396 0.0339 0.0361
20:01-21:00, Sun., 17 Aug. 0.0376 0.0326 0.0356
19:01-20:00, Sun., 17 Aug. 0.0396 0.0338 0.0360
18:01-19:00, Sun., 17 Aug. 0.0377 0.0338 0.0356
17:01-18:00, Sun., 17 Aug. 0.0374 0.0335 0.0357
16:01-17:00, Sun., 17 Aug. 0.0369 0.0335 0.0354
15:01-16:00, Sun., 17 Aug. 0.0378 0.0333 0.0357
14:01-15:00, Sun., 17 Aug. 0.0386 0.0338 0.0355
13:01-14:00, Sun., 17 Aug. 0.0375 0.0327 0.0357
12:01-13:00, Sun., 17 Aug. 0.0405 0.0332 0.0358
11:01-12:00, Sun., 17 Aug. 0.0387 0.0338 0.0358
10:01-11:00, Sun., 17 Aug. 0.0370 0.0336 0.0356
09:01-10:00, Sun., 17 Aug. 0.0378 0.0334 0.0356
08:01-09:00, Sun., 17 Aug. 0.0378 0.0327 0.0353
07:01-08:00, Sun., 17 Aug. 0.0373 0.0331 0.0353
06:01-07:00, Sun., 17 Aug. 0.0374 0.0334 0.0354
05:01-06:00, Sun., 17 Aug. 0.0379 0.0331 0.0355
04:01-05:00, Sun., 17 Aug. 0.0378 0.0338 0.0354
03:01-04:00, Sun., 17 Aug. 0.0375 0.0328 0.0354
02:01-03:00, Sun., 17 Aug. 0.0382 0.0336 0.0357
01:01-02:00, Sun., 17 Aug. 0.0371 0.0334 0.0353
00:01-01:00, Sun., 17 Aug. 0.0374 0.0337 0.0354
23:01-24:00, Sat., 16 Aug. 0.0386 0.0335 0.0353
22:01-23:00, Sat., 16 Aug. 0.0375 0.0327 0.0355
21:01-22:00, Sat., 16 Aug. 0.0386 0.0334 0.0352
20:01-21:00, Sat., 16 Aug. 0.0376 0.0335 0.0353
19:01-20:00, Sat., 16 Aug. 0.0379 0.0327 0.0356
18:01-19:00, Sat., 16 Aug. 0.0388 0.0325 0.0355
17:01-18:00, Sat., 16 Aug. 0.0384 0.0341 0.0355
16:01-17:00, Sat., 16 Aug. 0.0379 0.0333 0.0353
15:01-16:00, Sat., 16 Aug. 0.0388 0.0327 0.0353
14:01-15:00, Sat., 16 Aug. 0.0372 0.0328 0.0354
13:01-14:00, Sat., 16 Aug. 0.0374 0.0337 0.0357
12:01-13:00, Sat., 16 Aug. 0.0400 0.0323 0.0357
11:01-12:00, Sat., 16 Aug. 0.0386 0.0332 0.0355
10:01-11:00, Sat., 16 Aug. 0.0379 0.0339 0.0356
09:01-10:00, Sat., 16 Aug. 0.0371 0.0332 0.0352
08:01-09:00, Sat., 16 Aug. 0.0388 0.0333 0.0358
07:01-08:00, Sat., 16 Aug. 0.0384 0.0332 0.0357
06:01-07:00, Sat., 16 Aug. 0.0370 0.0328 0.0354
05:01-06:00, Sat., 16 Aug. 0.0372 0.0338 0.0356
04:01-05:00, Sat., 16 Aug. 0.0390 0.0329 0.0354
03:01-04:00, Sat., 16 Aug. 0.0375 0.0333 0.0354
02:01-03:00, Sat., 16 Aug. 0.0381 0.0335 0.0357
01:01-02:00, Sat., 16 Aug. 0.0385 0.0333 0.0354
00:01-01:00, Sat., 16 Aug. 0.0388 0.0336 0.0354
23:01-24:00, Fri., 15 Aug. 0.0375 0.0337 0.0353
22:01-23:00, Fri., 15 Aug. 0.0383 0.0332 0.0352
21:01-22:00, Fri., 15 Aug. 0.0392 0.0332 0.0351
20:01-21:00, Fri., 15 Aug. 0.0379 0.0334 0.0354
19:01-20:00, Fri., 15 Aug. 0.0380 0.0331 0.0352
18:01-19:00, Fri., 15 Aug. 0.0386 0.0331 0.0354
17:01-18:00, Fri., 15 Aug. 0.0379 0.0340 0.0357
16:01-17:00, Fri., 15 Aug. 0.0382 0.0336 0.0355
15:01-16:00, Fri., 15 Aug. 0.0393 0.0330 0.0354
14:01-15:00, Fri., 15 Aug. 0.0379 0.0328 0.0352
13:01-14:00, Fri., 15 Aug. 0.0374 0.0326 0.0351
12:01-13:00, Fri., 15 Aug. 0.0384 0.0336 0.0356
11:01-12:00, Fri., 15 Aug. 0.0385 0.0331 0.0357
10:01-11:00, Fri., 15 Aug. 0.0370 0.0332 0.0353
09:01-10:00, Fri., 15 Aug. 0.0375 0.0334 0.0355
08:01-09:00, Fri., 15 Aug. 0.0391 0.0330 0.0355
07:01-08:00, Fri., 15 Aug. 0.0373 0.0334 0.0356
06:01-07:00, Fri., 15 Aug. 0.0392 0.0336 0.0354
05:01-06:00, Fri., 15 Aug. 0.0384 0.0337 0.0355
04:01-05:00, Fri., 15 Aug. 0.0384 0.0335 0.0353
03:01-04:00, Fri., 15 Aug. 0.0376 0.0332 0.0352
02:01-03:00, Fri., 15 Aug. 0.0372 0.0323 0.0352
01:01-02:00, Fri., 15 Aug. 0.0369 0.0329 0.0352
00:01-01:00, Fri., 15 Aug. 0.0373 0.0332 0.0352
23:01-24:00, Thu., 14 Aug. 0.0371 0.0325 0.0351
22:01-23:00, Thu., 14 Aug. 0.0389 0.0334 0.0354
21:01-22:00, Thu., 14 Aug. 0.0374 0.0336 0.0353
20:01-21:00, Thu., 14 Aug. 0.0368 0.0337 0.0353
19:01-20:00, Thu., 14 Aug. 0.0373 0.0335 0.0353
18:01-19:00, Thu., 14 Aug. 0.0376 0.0326 0.0352
17:01-18:00, Thu., 14 Aug. 0.0372 0.0333 0.0352
16:01-17:00, Thu., 14 Aug. 0.0400 0.0326 0.0357
15:01-16:00, Thu., 14 Aug. 0.0370 0.0333 0.0352
14:01-15:00, Thu., 14 Aug. 0.0386 0.0332 0.0355
13:01-14:00, Thu., 14 Aug. 0.0373 0.0328 0.0353
12:01-13:00, Thu., 14 Aug. 0.0381 0.0325 0.0352
11:01-12:00, Thu., 14 Aug. 0.0382 0.0328 0.0353
10:01-11:00, Thu., 14 Aug. 0.0370 0.0328 0.0353
09:01-10:00, Thu., 14 Aug. 0.0372 0.0331 0.0353
08:01-09:00, Thu., 14 Aug. 0.0375 0.0329 0.0353
07:01-08:00, Thu., 14 Aug. 0.0372 0.0336 0.0353
06:01-07:00, Thu., 14 Aug. 0.0370 0.0333 0.0353
05:01-06:00, Thu., 14 Aug. 0.0385 0.0330 0.0354
04:01-05:00, Thu., 14 Aug. 0.0381 0.0329 0.0355
03:01-04:00, Thu., 14 Aug. 0.0373 0.0324 0.0351
02:01-03:00, Thu., 14 Aug. 0.0373 0.0333 0.0354
01:01-02:00, Thu., 14 Aug. 0.0387 0.0330 0.0356
00:01-01:00, Thu., 14 Aug. 0.0377 0.0332 0.0355
23:01-24:00, Wed., 13 Aug. 0.0384 0.0333 0.0358
22:01-23:00, Wed., 13 Aug. 0.0381 0.0341 0.0360
21:01-22:00, Wed., 13 Aug. 0.0372 0.0335 0.0355
20:01-21:00, Wed., 13 Aug. 0.0377 0.0329 0.0355
19:01-20:00, Wed., 13 Aug. 0.0381 0.0333 0.0354
18:01-19:00, Wed., 13 Aug. 0.0375 0.0337 0.0357
17:01-18:00, Wed., 13 Aug. 0.0393 0.0332 0.0354
16:01-17:00, Wed., 13 Aug. 0.0373 0.0336 0.0354
15:01-16:00, Wed., 13 Aug. 0.0374 0.0331 0.0352
14:01-15:00, Wed., 13 Aug. 0.0400 0.0332 0.0355
13:01-14:00, Wed., 13 Aug. 0.0374 0.0335 0.0354
12:01-13:00, Wed., 13 Aug. 0.0393 0.0333 0.0354
11:01-12:00, Wed., 13 Aug. 0.0379 0.0331 0.0354
10:01-11:00, Wed., 13 Aug. 0.0374 0.0329 0.0354
09:01-10:00, Wed., 13 Aug. 0.0371 0.0333 0.0353
08:01-09:00, Wed., 13 Aug. 0.0375 0.0335 0.0353
07:01-08:00, Wed., 13 Aug. 0.0371 0.0332 0.0352
06:01-07:00, Wed., 13 Aug. 0.0373 0.0328 0.0353
05:01-06:00, Wed., 13 Aug. 0.0373 0.0325 0.0352
04:01-05:00, Wed., 13 Aug. 0.0373 0.0334 0.0353
03:01-04:00, Wed., 13 Aug. 0.0381 0.0333 0.0355
02:01-03:00, Wed., 13 Aug. 0.0370 0.0340 0.0356
01:01-02:00, Wed., 13 Aug. 0.0372 0.0331 0.0354
00:01-01:00, Wed., 13 Aug. 0.0378 0.0327 0.0356
23:01-24:00, Tue., 12 Aug. 0.0381 0.0328 0.0356
22:01-23:00, Tue., 12 Aug. 0.0394 0.0343 0.0363
21:01-22:00, Tue., 12 Aug. 0.0424 0.0355 0.0384
20:01-21:00, Tue., 12 Aug. 0.0441 0.0369 0.0402
19:01-20:00, Tue., 12 Aug. 0.0481 0.0390 0.0429
18:01-19:00, Tue., 12 Aug. 0.0476 0.0370 0.0426
17:01-18:00, Tue., 12 Aug. 0.0413 0.0342 0.0366
16:01-17:00, Tue., 12 Aug. 0.0393 0.0339 0.0361
15:01-16:00, Tue., 12 Aug. 0.0379 0.0332 0.0352
14:01-15:00, Tue., 12 Aug. 0.0381 0.0329 0.0356
13:01-14:00, Tue., 12 Aug. 0.0386 0.0336 0.0358
12:01-13:00, Tue., 12 Aug. 0.0391 0.0336 0.0355
11:01-12:00, Tue., 12 Aug. 0.0379 0.0323 0.0349
10:01-11:00, Tue., 12 Aug. 0.0373 0.0324 0.0346
09:01-10:00, Tue., 12 Aug. 0.0370 0.0329 0.0348
08:01-09:00, Tue., 12 Aug. 0.0377 0.0325 0.0347
07:01-08:00, Tue., 12 Aug. 0.0366 0.0321 0.0346
06:01-07:00, Tue., 12 Aug. 0.0372 0.0325 0.0348
05:01-06:00, Tue., 12 Aug. 0.0372 0.0325 0.0348
04:01-05:00, Tue., 12 Aug. 0.0370 0.0328 0.0352
03:01-04:00, Tue., 12 Aug. 0.0370 0.0326 0.0352
02:01-03:00, Tue., 12 Aug. 0.0380 0.0330 0.0356
01:01-02:00, Tue., 12 Aug. 0.0370 0.0316 0.0346
00:01-01:00, Tue., 12 Aug. 0.0371 0.0319 0.0347
23:01-24:00, Mon., 11 Aug. 0.0365 0.0324 0.0348
22:01-23:00, Mon., 11 Aug. 0.0362 0.0320 0.0345
21:01-22:00, Mon., 11 Aug. 0.0364 0.0323 0.0346
20:01-21:00, Mon., 11 Aug. 0.0368 0.0327 0.0348
19:01-20:00, Mon., 11 Aug. 0.0370 0.0339 0.0355
18:01-19:00, Mon., 11 Aug. 0.0419 0.0351 0.0382
17:01-18:00, Mon., 11 Aug. 0.0487 0.0398 0.0442
16:01-17:00, Mon., 11 Aug. 0.0457 0.0354 0.0403
15:01-16:00, Mon., 11 Aug. 0.0416 0.0346 0.0376
14:01-15:00, Mon., 11 Aug. 0.0458 0.0354 0.0383
13:01-14:00, Mon., 11 Aug. 0.0456 0.0370 0.0415
12:01-13:00, Mon., 11 Aug. 0.0419 0.0340 0.0370
11:01-12:00, Mon., 11 Aug. 0.0434 0.0345 0.0379
10:01-11:00, Mon., 11 Aug. 0.0471 0.0387 0.0423
09:01-10:00, Mon., 11 Aug. 0.0448 0.0358 0.0398
08:01-09:00, Mon., 11 Aug. 0.0378 0.0327 0.0351
07:01-08:00, Mon., 11 Aug. 0.0367 0.0331 0.0346
06:01-07:00, Mon., 11 Aug. 0.0372 0.0334 0.0350
05:01-06:00, Mon., 11 Aug. 0.0371 0.0335 0.0353
04:01-05:00, Mon., 11 Aug. 0.0405 0.0338 0.0363
03:01-04:00, Mon., 11 Aug. 0.0410 0.0356 0.0379
02:01-03:00, Mon., 11 Aug. 0.0447 0.0366 0.0408
01:01-02:00, Mon., 11 Aug. 0.0472 0.0395 0.0427
00:01-01:00, Mon., 11 Aug. 0.0464 0.0360 0.0409
23:01-24:00, Sun., 10 Aug. 0.0387 0.0336 0.0360
22:01-23:00, Sun., 10 Aug. 0.0402 0.0339 0.0366
21:01-22:00, Sun., 10 Aug. 0.0459 0.0363 0.0408
20:01-21:00, Sun., 10 Aug. 0.0459 0.0374 0.0415
19:01-20:00, Sun., 10 Aug. 0.0434 0.0350 0.0397
18:01-19:00, Sun., 10 Aug. 0.0400 0.0330 0.0370
17:01-18:00, Sun., 10 Aug. 0.0383 0.0341 0.0363
16:01-17:00, Sun., 10 Aug. 0.0376 0.0334 0.0356
15:01-16:00, Sun., 10 Aug. 0.0378 0.0325 0.0359
14:01-15:00, Sun., 10 Aug. 0.0397 0.0340 0.0367
13:01-14:00, Sun., 10 Aug. 0.0419 0.0354 0.0391
12:01-13:00, Sun., 10 Aug. 0.0426 0.0356 0.0387
11:01-12:00, Sun., 10 Aug. 0.0425 0.0367 0.0394
10:01-11:00, Sun., 10 Aug. 0.0452 0.0382 0.0416
09:01-10:00, Sun., 10 Aug. 0.0471 0.0398 0.0435
08:01-09:00, Sun., 10 Aug. 0.0472 0.0362 0.0424
07:01-08:00, Sun., 10 Aug. 0.0423 0.0352 0.0384
06:01-07:00, Sun., 10 Aug. 0.0405 0.0347 0.0367
05:01-06:00, Sun., 10 Aug. 0.0389 0.0338 0.0364
04:01-05:00, Sun., 10 Aug. 0.0396 0.0345 0.0367
03:01-04:00, Sun., 10 Aug. 0.0426 0.0357 0.0377
02:01-03:00, Sun., 10 Aug. 0.0426 0.0339 0.0369
01:01-02:00, Sun., 10 Aug. 0.0384 0.0335 0.0360
00:01-01:00, Sun., 10 Aug. 0.0380 0.0336 0.0361
23:01-24:00, Sat., 09 Aug. 0.0385 0.0331 0.0361
22:01-23:00, Sat., 09 Aug. 0.0393 0.0331 0.0362
21:01-22:00, Sat., 09 Aug. 0.0390 0.0337 0.0362
20:01-21:00, Sat., 09 Aug. 0.0397 0.0345 0.0362
19:01-20:00, Sat., 09 Aug. 0.0380 0.0337 0.0362
18:01-19:00, Sat., 09 Aug. 0.0383 0.0338 0.0360
17:01-18:00, Sat., 09 Aug. 0.0376 0.0336 0.0358
16:01-17:00, Sat., 09 Aug. 0.0374 0.0337 0.0361
15:01-16:00, Sat., 09 Aug. 0.0382 0.0331 0.0359
14:01-15:00, Sat., 09 Aug. 0.0387 0.0339 0.0361
13:01-14:00, Sat., 09 Aug. 0.0392 0.0349 0.0362
12:01-13:00, Sat., 09 Aug. 0.0391 0.0329 0.0360
11:01-12:00, Sat., 09 Aug. 0.0383 0.0338 0.0360
10:01-11:00, Sat., 09 Aug. 0.0379 0.0332 0.0360
09:01-10:00, Sat., 09 Aug. 0.0396 0.0340 0.0362
08:01-09:00, Sat., 09 Aug. 0.0384 0.0337 0.0359
07:01-08:00, Sat., 09 Aug. 0.0377 0.0343 0.0361
06:01-07:00, Sat., 09 Aug. 0.0398 0.0340 0.0360
05:01-06:00, Sat., 09 Aug. 0.0407 0.0346 0.0364
04:01-05:00, Sat., 09 Aug. 0.0387 0.0332 0.0361
03:01-04:00, Sat., 09 Aug. 0.0389 0.0326 0.0360
02:01-03:00, Sat., 09 Aug. 0.0388 0.0334 0.0361
01:01-02:00, Sat., 09 Aug. 0.0405 0.0330 0.0362
00:01-01:00, Sat., 09 Aug. 0.0382 0.0341 0.0361
23:01-24:00, Fri., 08 Aug. 0.0379 0.0340 0.0361
22:01-23:00, Fri., 08 Aug. 0.0379 0.0344 0.0360
21:01-22:00, Fri., 08 Aug. 0.0398 0.0341 0.0360
20:01-21:00, Fri., 08 Aug. 0.0378 0.0343 0.0360
19:01-20:00, Fri., 08 Aug. 0.0401 0.0338 0.0363
18:01-19:00, Fri., 08 Aug. 0.0381 0.0343 0.0361
17:01-18:00, Fri., 08 Aug. 0.0397 0.0344 0.0366