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
02:01-03:00, Sun., 14 Dec. 0.0402 0.0341 0.0363
01:01-02:00, Sun., 14 Dec. 0.0392 0.0340 0.0364
00:01-01:00, Sun., 14 Dec. 0.0415 0.0343 0.0377
23:01-24:00, Sat., 13 Dec. 0.0441 0.0357 0.0396
22:01-23:00, Sat., 13 Dec. 0.0452 0.0374 0.0408
21:01-22:00, Sat., 13 Dec. 0.0426 0.0360 0.0382
20:01-21:00, Sat., 13 Dec. 0.0423 0.0351 0.0379
19:01-20:00, Sat., 13 Dec. 0.0392 0.0336 0.0359
18:01-19:00, Sat., 13 Dec. 0.0375 0.0337 0.0355
17:01-18:00, Sat., 13 Dec. 0.0378 0.0331 0.0354
16:01-17:00, Sat., 13 Dec. 0.0385 0.0333 0.0355
15:01-16:00, Sat., 13 Dec. 0.0382 0.0336 0.0355
14:01-15:00, Sat., 13 Dec. 0.0378 0.0336 0.0354
13:01-14:00, Sat., 13 Dec. 0.0386 0.0343 0.0359
12:01-13:00, Sat., 13 Dec. 0.0397 0.0341 0.0359
11:01-12:00, Sat., 13 Dec. 0.0371 0.0340 0.0357
10:01-11:00, Sat., 13 Dec. 0.0392 0.0333 0.0358
09:01-10:00, Sat., 13 Dec. 0.0377 0.0338 0.0358
08:01-09:00, Sat., 13 Dec. 0.0390 0.0342 0.0357
07:01-08:00, Sat., 13 Dec. 0.0384 0.0332 0.0357
06:01-07:00, Sat., 13 Dec. 0.0390 0.0336 0.0355
05:01-06:00, Sat., 13 Dec. 0.0381 0.0328 0.0360
04:01-05:00, Sat., 13 Dec. 0.0387 0.0337 0.0357
03:01-04:00, Sat., 13 Dec. 0.0385 0.0343 0.0358
02:01-03:00, Sat., 13 Dec. 0.0384 0.0335 0.0356
01:01-02:00, Sat., 13 Dec. 0.0383 0.0343 0.0358
00:01-01:00, Sat., 13 Dec. 0.0390 0.0336 0.0359
23:01-24:00, Fri., 12 Dec. 0.0371 0.0334 0.0357
22:01-23:00, Fri., 12 Dec. 0.0396 0.0341 0.0358
21:01-22:00, Fri., 12 Dec. 0.0382 0.0336 0.0358
20:01-21:00, Fri., 12 Dec. 0.0381 0.0343 0.0358
19:01-20:00, Fri., 12 Dec. 0.0369 0.0332 0.0355
18:01-19:00, Fri., 12 Dec. 0.0391 0.0337 0.0360
17:01-18:00, Fri., 12 Dec. 0.0382 0.0334 0.0356
16:01-17:00, Fri., 12 Dec. 0.0389 0.0342 0.0360
15:01-16:00, Fri., 12 Dec. 0.0397 0.0337 0.0358
14:01-15:00, Fri., 12 Dec. 0.0378 0.0341 0.0357
13:01-14:00, Fri., 12 Dec. 0.0371 0.0340 0.0358
12:01-13:00, Fri., 12 Dec. 0.0383 0.0333 0.0357
11:01-12:00, Fri., 12 Dec. 0.0382 0.0330 0.0354
10:01-11:00, Fri., 12 Dec. 0.0389 0.0336 0.0361
09:01-10:00, Fri., 12 Dec. 0.0393 0.0344 0.0362
08:01-09:00, Fri., 12 Dec. 0.0385 0.0333 0.0361
07:01-08:00, Fri., 12 Dec. 0.0388 0.0338 0.0362
06:01-07:00, Fri., 12 Dec. 0.0402 0.0338 0.0365
05:01-06:00, Fri., 12 Dec. 0.0381 0.0345 0.0363
04:01-05:00, Fri., 12 Dec. 0.0397 0.0344 0.0365
03:01-04:00, Fri., 12 Dec. 0.0395 0.0349 0.0366
02:01-03:00, Fri., 12 Dec. 0.0389 0.0344 0.0368
01:01-02:00, Fri., 12 Dec. 0.0397 0.0349 0.0364
00:01-01:00, Fri., 12 Dec. 0.0404 0.0342 0.0367
23:01-24:00, Thu., 11 Dec. 0.0387 0.0335 0.0366
22:01-23:00, Thu., 11 Dec. 0.0416 0.0344 0.0363
21:01-22:00, Thu., 11 Dec. 0.0402 0.0340 0.0364
20:01-21:00, Thu., 11 Dec. 0.0375 0.0337 0.0360
19:01-20:00, Thu., 11 Dec. 0.0384 0.0345 0.0361
18:01-19:00, Thu., 11 Dec. 0.0394 0.0344 0.0363
17:01-18:00, Thu., 11 Dec. 0.0391 0.0343 0.0360
16:01-17:00, Thu., 11 Dec. 0.0387 0.0343 0.0362
15:01-16:00, Thu., 11 Dec. 0.0387 0.0345 0.0359
14:01-15:00, Thu., 11 Dec. 0.0391 0.0344 0.0361
13:01-14:00, Thu., 11 Dec. 0.0404 0.0344 0.0364
12:01-13:00, Thu., 11 Dec. 0.0406 0.0352 0.0370
11:01-12:00, Thu., 11 Dec. 0.0398 0.0335 0.0368
10:01-11:00, Thu., 11 Dec. 0.0403 0.0347 0.0371
09:01-10:00, Thu., 11 Dec. 0.0404 0.0349 0.0369
08:01-09:00, Thu., 11 Dec. 0.0405 0.0331 0.0368
07:01-08:00, Thu., 11 Dec. 0.0395 0.0344 0.0366
06:01-07:00, Thu., 11 Dec. 0.0422 0.0352 0.0369
05:01-06:00, Thu., 11 Dec. 0.0407 0.0353 0.0371
04:01-05:00, Thu., 11 Dec. 0.0401 0.0345 0.0370
03:01-04:00, Thu., 11 Dec. 0.0392 0.0345 0.0364
02:01-03:00, Thu., 11 Dec. 0.0408 0.0347 0.0367
01:01-02:00, Thu., 11 Dec. 0.0401 0.0341 0.0366
00:01-01:00, Thu., 11 Dec. 0.0403 0.0340 0.0369
23:01-24:00, Wed., 10 Dec. 0.0387 0.0346 0.0364
22:01-23:00, Wed., 10 Dec. 0.0387 0.0343 0.0360
21:01-22:00, Wed., 10 Dec. 0.0399 0.0341 0.0362
20:01-21:00, Wed., 10 Dec. 0.0392 0.0340 0.0362
19:01-20:00, Wed., 10 Dec. 0.0397 0.0348 0.0363
18:01-19:00, Wed., 10 Dec. 0.0380 0.0343 0.0361
17:01-18:00, Wed., 10 Dec. 0.0384 0.0338 0.0360
16:01-17:00, Wed., 10 Dec. 0.0390 0.0333 0.0359
15:01-16:00, Wed., 10 Dec. 0.0382 0.0343 0.0363
14:01-15:00, Wed., 10 Dec. 0.0397 0.0340 0.0362
13:01-14:00, Wed., 10 Dec. 0.0391 0.0345 0.0362
12:01-13:00, Wed., 10 Dec. 0.0401 0.0343 0.0367
11:01-12:00, Wed., 10 Dec. 0.0407 0.0349 0.0368
10:01-11:00, Wed., 10 Dec. 0.0409 0.0345 0.0370
09:01-10:00, Wed., 10 Dec. 0.0415 0.0354 0.0373
08:01-09:00, Wed., 10 Dec. 0.0418 0.0351 0.0374
07:01-08:00, Wed., 10 Dec. 0.0410 0.0353 0.0371
06:01-07:00, Wed., 10 Dec. 0.0415 0.0345 0.0370
05:01-06:00, Wed., 10 Dec. 0.0389 0.0336 0.0363
04:01-05:00, Wed., 10 Dec. 0.0388 0.0345 0.0364
03:01-04:00, Wed., 10 Dec. 0.0391 0.0340 0.0364
02:01-03:00, Wed., 10 Dec. 0.0399 0.0340 0.0361
01:01-02:00, Wed., 10 Dec. 0.0379 0.0332 0.0360
00:01-01:00, Wed., 10 Dec. 0.0400 0.0348 0.0363
23:01-24:00, Tue., 09 Dec. 0.0399 0.0340 0.0359
22:01-23:00, Tue., 09 Dec. 0.0377 0.0338 0.0359
21:01-22:00, Tue., 09 Dec. 0.0401 0.0342 0.0361
20:01-21:00, Tue., 09 Dec. 0.0375 0.0344 0.0361
19:01-20:00, Tue., 09 Dec. 0.0397 0.0349 0.0365
18:01-19:00, Tue., 09 Dec. 0.0391 0.0342 0.0363
17:01-18:00, Tue., 09 Dec. 0.0397 0.0343 0.0364
16:01-17:00, Tue., 09 Dec. 0.0389 0.0335 0.0365
15:01-16:00, Tue., 09 Dec. 0.0387 0.0341 0.0362
14:01-15:00, Tue., 09 Dec. 0.0399 0.0345 0.0363
13:01-14:00, Tue., 09 Dec. 0.0405 0.0343 0.0363
12:01-13:00, Tue., 09 Dec. 0.0399 0.0341 0.0364
11:01-12:00, Tue., 09 Dec. 0.0393 0.0346 0.0365
10:01-11:00, Tue., 09 Dec. 0.0389 0.0330 0.0363
09:01-10:00, Tue., 09 Dec. 0.0394 0.0338 0.0363
08:01-09:00, Tue., 09 Dec. 0.0397 0.0344 0.0363
07:01-08:00, Tue., 09 Dec. 0.0402 0.0339 0.0369
06:01-07:00, Tue., 09 Dec. 0.0401 0.0345 0.0366
05:01-06:00, Tue., 09 Dec. 0.0392 0.0345 0.0363
04:01-05:00, Tue., 09 Dec. 0.0405 0.0345 0.0367
03:01-04:00, Tue., 09 Dec. 0.0396 0.0347 0.0368
02:01-03:00, Tue., 09 Dec. 0.0395 0.0344 0.0368
01:01-02:00, Tue., 09 Dec. 0.0405 0.0348 0.0368
00:01-01:00, Tue., 09 Dec. 0.0405 0.0340 0.0367
23:01-24:00, Mon., 08 Dec. 0.0407 0.0340 0.0366
22:01-23:00, Mon., 08 Dec. 0.0411 0.0347 0.0367
21:01-22:00, Mon., 08 Dec. 0.0402 0.0349 0.0366
20:01-21:00, Mon., 08 Dec. 0.0391 0.0335 0.0364
19:01-20:00, Mon., 08 Dec. 0.0390 0.0347 0.0365
18:01-19:00, Mon., 08 Dec. 0.0403 0.0341 0.0365
17:01-18:00, Mon., 08 Dec. 0.0398 0.0344 0.0364
16:01-17:00, Mon., 08 Dec. 0.0406 0.0343 0.0366
15:01-16:00, Mon., 08 Dec. 0.0402 0.0348 0.0364
14:01-15:00, Mon., 08 Dec. 0.0396 0.0337 0.0364
13:01-14:00, Mon., 08 Dec. 0.0388 0.0343 0.0362
12:01-13:00, Mon., 08 Dec. 0.0385 0.0339 0.0365
11:01-12:00, Mon., 08 Dec. 0.0392 0.0341 0.0366
10:01-11:00, Mon., 08 Dec. 0.0401 0.0346 0.0367
09:01-10:00, Mon., 08 Dec. 0.0413 0.0349 0.0368
08:01-09:00, Mon., 08 Dec. 0.0417 0.0352 0.0373
07:01-08:00, Mon., 08 Dec. 0.0395 0.0349 0.0372
06:01-07:00, Mon., 08 Dec. 0.0397 0.0350 0.0371
05:01-06:00, Mon., 08 Dec. 0.0401 0.0343 0.0370
04:01-05:00, Mon., 08 Dec. 0.0407 0.0346 0.0371
03:01-04:00, Mon., 08 Dec. 0.0398 0.0348 0.0371
02:01-03:00, Mon., 08 Dec. 0.0405 0.0346 0.0368
01:01-02:00, Mon., 08 Dec. 0.0417 0.0352 0.0370
00:01-01:00, Mon., 08 Dec. 0.0390 0.0345 0.0367
23:01-24:00, Sun., 07 Dec. 0.0390 0.0344 0.0366
22:01-23:00, Sun., 07 Dec. 0.0409 0.0336 0.0364
21:01-22:00, Sun., 07 Dec. 0.0409 0.0341 0.0363
20:01-21:00, Sun., 07 Dec. 0.0374 0.0346 0.0362
19:01-20:00, Sun., 07 Dec. 0.0382 0.0337 0.0360
18:01-19:00, Sun., 07 Dec. 0.0385 0.0346 0.0364
17:01-18:00, Sun., 07 Dec. 0.0389 0.0334 0.0364
16:01-17:00, Sun., 07 Dec. 0.0398 0.0338 0.0359
15:01-16:00, Sun., 07 Dec. 0.0388 0.0343 0.0364
14:01-15:00, Sun., 07 Dec. 0.0389 0.0347 0.0365
13:01-14:00, Sun., 07 Dec. 0.0390 0.0341 0.0361
12:01-13:00, Sun., 07 Dec. 0.0389 0.0342 0.0362
11:01-12:00, Sun., 07 Dec. 0.0397 0.0349 0.0365
10:01-11:00, Sun., 07 Dec. 0.0398 0.0340 0.0367
09:01-10:00, Sun., 07 Dec. 0.0399 0.0350 0.0370
08:01-09:00, Sun., 07 Dec. 0.0402 0.0353 0.0373
07:01-08:00, Sun., 07 Dec. 0.0407 0.0349 0.0371
06:01-07:00, Sun., 07 Dec. 0.0413 0.0349 0.0375
05:01-06:00, Sun., 07 Dec. 0.0410 0.0348 0.0379
04:01-05:00, Sun., 07 Dec. 0.0404 0.0353 0.0375
03:01-04:00, Sun., 07 Dec. 0.0410 0.0353 0.0369
02:01-03:00, Sun., 07 Dec. 0.0390 0.0346 0.0366
01:01-02:00, Sun., 07 Dec. 0.0392 0.0349 0.0368
00:01-01:00, Sun., 07 Dec. 0.0401 0.0344 0.0369
23:01-24:00, Sat., 06 Dec. 0.0388 0.0341 0.0366
22:01-23:00, Sat., 06 Dec. 0.0393 0.0336 0.0364
21:01-22:00, Sat., 06 Dec. 0.0387 0.0335 0.0365
20:01-21:00, Sat., 06 Dec. 0.0390 0.0346 0.0363
19:01-20:00, Sat., 06 Dec. 0.0389 0.0344 0.0364
18:01-19:00, Sat., 06 Dec. 0.0385 0.0340 0.0361
17:01-18:00, Sat., 06 Dec. 0.0378 0.0337 0.0360
16:01-17:00, Sat., 06 Dec. 0.0387 0.0345 0.0361
15:01-16:00, Sat., 06 Dec. 0.0386 0.0345 0.0361
14:01-15:00, Sat., 06 Dec. 0.0391 0.0333 0.0361
13:01-14:00, Sat., 06 Dec. 0.0393 0.0345 0.0364
12:01-13:00, Sat., 06 Dec. 0.0389 0.0347 0.0366
11:01-12:00, Sat., 06 Dec. 0.0392 0.0343 0.0363
10:01-11:00, Sat., 06 Dec. 0.0395 0.0334 0.0364
09:01-10:00, Sat., 06 Dec. 0.0397 0.0347 0.0366
08:01-09:00, Sat., 06 Dec. 0.0389 0.0348 0.0365
07:01-08:00, Sat., 06 Dec. 0.0388 0.0342 0.0365
06:01-07:00, Sat., 06 Dec. 0.0390 0.0346 0.0363
05:01-06:00, Sat., 06 Dec. 0.0406 0.0344 0.0370
04:01-05:00, Sat., 06 Dec. 0.0390 0.0331 0.0367
03:01-04:00, Sat., 06 Dec. 0.0389 0.0343 0.0365
02:01-03:00, Sat., 06 Dec. 0.0387 0.0343 0.0364
01:01-02:00, Sat., 06 Dec. 0.0389 0.0348 0.0367
00:01-01:00, Sat., 06 Dec. 0.0402 0.0334 0.0365
23:01-24:00, Fri., 05 Dec. 0.0393 0.0336 0.0363
22:01-23:00, Fri., 05 Dec. 0.0391 0.0334 0.0363
21:01-22:00, Fri., 05 Dec. 0.0406 0.0335 0.0360
20:01-21:00, Fri., 05 Dec. 0.0389 0.0345 0.0360
19:01-20:00, Fri., 05 Dec. 0.0394 0.0345 0.0363
18:01-19:00, Fri., 05 Dec. 0.0379 0.0336 0.0358
17:01-18:00, Fri., 05 Dec. 0.0401 0.0348 0.0364
16:01-17:00, Fri., 05 Dec. 0.0391 0.0344 0.0361
15:01-16:00, Fri., 05 Dec. 0.0393 0.0342 0.0364
14:01-15:00, Fri., 05 Dec. 0.0393 0.0339 0.0364
13:01-14:00, Fri., 05 Dec. 0.0403 0.0345 0.0365
12:01-13:00, Fri., 05 Dec. 0.0417 0.0344 0.0365
11:01-12:00, Fri., 05 Dec. 0.0390 0.0332 0.0360
10:01-11:00, Fri., 05 Dec. 0.0375 0.0351 0.0361
09:01-10:00, Fri., 05 Dec. 0.0398 0.0337 0.0357
08:01-09:00, Fri., 05 Dec. 0.0389 0.0337 0.0362
07:01-08:00, Fri., 05 Dec. 0.0384 0.0337 0.0360
06:01-07:00, Fri., 05 Dec. 0.0404 0.0341 0.0363
05:01-06:00, Fri., 05 Dec. 0.0382 0.0344 0.0364
04:01-05:00, Fri., 05 Dec. 0.0393 0.0341 0.0362
03:01-04:00, Fri., 05 Dec. 0.0370 0.0334 0.0355
02:01-03:00, Fri., 05 Dec. 0.0376 0.0327 0.0354
01:01-02:00, Fri., 05 Dec. 0.0369 0.0336 0.0354
00:01-01:00, Fri., 05 Dec. 0.0370 0.0328 0.0351
23:01-24:00, Thu., 04 Dec. 0.0379 0.0336 0.0350
22:01-23:00, Thu., 04 Dec. 0.0385 0.0333 0.0355
21:01-22:00, Thu., 04 Dec. 0.0373 0.0322 0.0350
20:01-21:00, Thu., 04 Dec. 0.0371 0.0330 0.0351
19:01-20:00, Thu., 04 Dec. 0.0369 0.0331 0.0351
18:01-19:00, Thu., 04 Dec. 0.0367 0.0333 0.0353
17:01-18:00, Thu., 04 Dec. 0.0378 0.0334 0.0353
16:01-17:00, Thu., 04 Dec. 0.0373 0.0327 0.0353
15:01-16:00, Thu., 04 Dec. 0.0375 0.0327 0.0354
14:01-15:00, Thu., 04 Dec. 0.0376 0.0329 0.0354
13:01-14:00, Thu., 04 Dec. 0.0381 0.0341 0.0355
12:01-13:00, Thu., 04 Dec. 0.0375 0.0338 0.0355
11:01-12:00, Thu., 04 Dec. 0.0392 0.0337 0.0360
10:01-11:00, Thu., 04 Dec. 0.0382 0.0337 0.0358
09:01-10:00, Thu., 04 Dec. 0.0375 0.0335 0.0357
08:01-09:00, Thu., 04 Dec. 0.0371 0.0328 0.0354
07:01-08:00, Thu., 04 Dec. 0.0374 0.0333 0.0356
06:01-07:00, Thu., 04 Dec. 0.0378 0.0323 0.0353
05:01-06:00, Thu., 04 Dec. 0.0376 0.0331 0.0353
04:01-05:00, Thu., 04 Dec. 0.0378 0.0331 0.0353
03:01-04:00, Thu., 04 Dec. 0.0373 0.0337 0.0354