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
19:01-20:00, Mon., 20 Apr. 0.0387 0.0337 0.0360
18:01-19:00, Mon., 20 Apr. 0.0379 0.0338 0.0359
17:01-18:00, Mon., 20 Apr. 0.0374 0.0330 0.0357
16:01-17:00, Mon., 20 Apr. 0.0394 0.0337 0.0357
15:01-16:00, Mon., 20 Apr. 0.0377 0.0333 0.0358
14:01-15:00, Mon., 20 Apr. 0.0379 0.0335 0.0358
13:01-14:00, Mon., 20 Apr. 0.0382 0.0336 0.0357
12:01-13:00, Mon., 20 Apr. 0.0383 0.0343 0.0359
11:01-12:00, Mon., 20 Apr. 0.0385 0.0330 0.0358
10:01-11:00, Mon., 20 Apr. 0.0391 0.0342 0.0360
09:01-10:00, Mon., 20 Apr. 0.0388 0.0341 0.0360
08:01-09:00, Mon., 20 Apr. 0.0382 0.0331 0.0361
07:01-08:00, Mon., 20 Apr. 0.0383 0.0345 0.0362
06:01-07:00, Mon., 20 Apr. 0.0396 0.0321 0.0362
05:01-06:00, Mon., 20 Apr. 0.0413 0.0332 0.0362
04:01-05:00, Mon., 20 Apr. 0.0379 0.0340 0.0358
03:01-04:00, Mon., 20 Apr. 0.0377 0.0342 0.0361
02:01-03:00, Mon., 20 Apr. 0.0392 0.0343 0.0360
01:01-02:00, Mon., 20 Apr. 0.0382 0.0340 0.0359
00:01-01:00, Mon., 20 Apr. 0.0381 0.0341 0.0362
23:01-24:00, Sun., 19 Apr. 0.0371 0.0334 0.0358
22:01-23:00, Sun., 19 Apr. 0.0384 0.0339 0.0362
21:01-22:00, Sun., 19 Apr. 0.0381 0.0340 0.0359
20:01-21:00, Sun., 19 Apr. 0.0401 0.0341 0.0361
19:01-20:00, Sun., 19 Apr. 0.0382 0.0341 0.0359
18:01-19:00, Sun., 19 Apr. 0.0399 0.0334 0.0359
17:01-18:00, Sun., 19 Apr. 0.0386 0.0335 0.0360
16:01-17:00, Sun., 19 Apr. 0.0372 0.0333 0.0355
15:01-16:00, Sun., 19 Apr. 0.0376 0.0333 0.0358
14:01-15:00, Sun., 19 Apr. 0.0396 0.0331 0.0362
13:01-14:00, Sun., 19 Apr. 0.0383 0.0341 0.0359
12:01-13:00, Sun., 19 Apr. 0.0382 0.0343 0.0362
11:01-12:00, Sun., 19 Apr. 0.0391 0.0338 0.0363
10:01-11:00, Sun., 19 Apr. 0.0408 0.0347 0.0366
09:01-10:00, Sun., 19 Apr. 0.0399 0.0352 0.0367
08:01-09:00, Sun., 19 Apr. 0.0394 0.0346 0.0366
07:01-08:00, Sun., 19 Apr. 0.0392 0.0347 0.0367
06:01-07:00, Sun., 19 Apr. 0.0404 0.0344 0.0366
05:01-06:00, Sun., 19 Apr. 0.0383 0.0340 0.0362
04:01-05:00, Sun., 19 Apr. 0.0376 0.0337 0.0355
03:01-04:00, Sun., 19 Apr. 0.0385 0.0339 0.0357
02:01-03:00, Sun., 19 Apr. 0.0374 0.0332 0.0354
01:01-02:00, Sun., 19 Apr. 0.0376 0.0332 0.0356
00:01-01:00, Sun., 19 Apr. 0.0381 0.0337 0.0354
23:01-24:00, Sat., 18 Apr. 0.0372 0.0338 0.0355
22:01-23:00, Sat., 18 Apr. 0.0385 0.0332 0.0356
21:01-22:00, Sat., 18 Apr. 0.0408 0.0332 0.0355
20:01-21:00, Sat., 18 Apr. 0.0382 0.0329 0.0353
19:01-20:00, Sat., 18 Apr. 0.0387 0.0330 0.0356
18:01-19:00, Sat., 18 Apr. 0.0392 0.0337 0.0357
17:01-18:00, Sat., 18 Apr. 0.0389 0.0331 0.0356
16:01-17:00, Sat., 18 Apr. 0.0398 0.0331 0.0356
15:01-16:00, Sat., 18 Apr. 0.0371 0.0330 0.0353
14:01-15:00, Sat., 18 Apr. 0.0375 0.0342 0.0356
13:01-14:00, Sat., 18 Apr. 0.0372 0.0329 0.0356
12:01-13:00, Sat., 18 Apr. 0.0383 0.0338 0.0357
11:01-12:00, Sat., 18 Apr. 0.0385 0.0339 0.0358
10:01-11:00, Sat., 18 Apr. 0.0395 0.0331 0.0360
09:01-10:00, Sat., 18 Apr. 0.0387 0.0338 0.0359
08:01-09:00, Sat., 18 Apr. 0.0380 0.0337 0.0359
07:01-08:00, Sat., 18 Apr. 0.0374 0.0338 0.0357
06:01-07:00, Sat., 18 Apr. 0.0393 0.0335 0.0356
05:01-06:00, Sat., 18 Apr. 0.0396 0.0333 0.0355
04:01-05:00, Sat., 18 Apr. 0.0371 0.0337 0.0356
03:01-04:00, Sat., 18 Apr. 0.0381 0.0333 0.0353
02:01-03:00, Sat., 18 Apr. 0.0369 0.0333 0.0354
01:01-02:00, Sat., 18 Apr. 0.0377 0.0331 0.0355
00:01-01:00, Sat., 18 Apr. 0.0374 0.0332 0.0355
23:01-24:00, Fri., 17 Apr. 0.0372 0.0328 0.0353
22:01-23:00, Fri., 17 Apr. 0.0375 0.0329 0.0355
21:01-22:00, Fri., 17 Apr. 0.0380 0.0336 0.0354
20:01-21:00, Fri., 17 Apr. 0.0376 0.0329 0.0351
19:01-20:00, Fri., 17 Apr. 0.0383 0.0336 0.0353
18:01-19:00, Fri., 17 Apr. 0.0402 0.0337 0.0356
17:01-18:00, Fri., 17 Apr. 0.0391 0.0330 0.0353
16:01-17:00, Fri., 17 Apr. 0.0374 0.0331 0.0355
15:01-16:00, Fri., 17 Apr. 0.0393 0.0336 0.0357
14:01-15:00, Fri., 17 Apr. 0.0375 0.0333 0.0356
13:01-14:00, Fri., 17 Apr. 0.0415 0.0336 0.0359
12:01-13:00, Fri., 17 Apr. 0.0377 0.0332 0.0356
11:01-12:00, Fri., 17 Apr. 0.0376 0.0326 0.0356
10:01-11:00, Fri., 17 Apr. 0.0384 0.0331 0.0356
09:01-10:00, Fri., 17 Apr. 0.0374 0.0330 0.0356
08:01-09:00, Fri., 17 Apr. 0.0383 0.0332 0.0354
07:01-08:00, Fri., 17 Apr. 0.0390 0.0332 0.0356
06:01-07:00, Fri., 17 Apr. 0.0375 0.0332 0.0355
05:01-06:00, Fri., 17 Apr. 0.0378 0.0334 0.0354
04:01-05:00, Fri., 17 Apr. 0.0383 0.0335 0.0355
03:01-04:00, Fri., 17 Apr. 0.0373 0.0329 0.0353
02:01-03:00, Fri., 17 Apr. 0.0369 0.0331 0.0351
01:01-02:00, Fri., 17 Apr. 0.0369 0.0335 0.0352
00:01-01:00, Fri., 17 Apr. 0.0368 0.0329 0.0353
23:01-24:00, Thu., 16 Apr. 0.0370 0.0331 0.0352
22:01-23:00, Thu., 16 Apr. 0.0377 0.0328 0.0354
21:01-22:00, Thu., 16 Apr. 0.0377 0.0333 0.0355
20:01-21:00, Thu., 16 Apr. 0.0372 0.0336 0.0355
19:01-20:00, Thu., 16 Apr. 0.0376 0.0334 0.0356
18:01-19:00, Thu., 16 Apr. 0.0384 0.0333 0.0355
17:01-18:00, Thu., 16 Apr. 0.0402 0.0323 0.0358
16:01-17:00, Thu., 16 Apr. 0.0388 0.0339 0.0358
15:01-16:00, Thu., 16 Apr. 0.0389 0.0345 0.0361
14:01-15:00, Thu., 16 Apr. 0.0385 0.0341 0.0359
13:01-14:00, Thu., 16 Apr. 0.0393 0.0338 0.0360
12:01-13:00, Thu., 16 Apr. 0.0387 0.0343 0.0359
11:01-12:00, Thu., 16 Apr. 0.0396 0.0323 0.0360
10:01-11:00, Thu., 16 Apr. 0.0391 0.0343 0.0361
09:01-10:00, Thu., 16 Apr. 0.0395 0.0347 0.0362
08:01-09:00, Thu., 16 Apr. 0.0386 0.0337 0.0359
07:01-08:00, Thu., 16 Apr. 0.0383 0.0340 0.0358
06:01-07:00, Thu., 16 Apr. 0.0393 0.0337 0.0357
05:01-06:00, Thu., 16 Apr. 0.0386 0.0343 0.0360
04:01-05:00, Thu., 16 Apr. 0.0416 0.0344 0.0368
03:01-04:00, Thu., 16 Apr. 0.0427 0.0359 0.0386
02:01-03:00, Thu., 16 Apr. 0.0442 0.0379 0.0412
01:01-02:00, Thu., 16 Apr. 0.0481 0.0376 0.0415
00:01-01:00, Thu., 16 Apr. 0.0448 0.0368 0.0411
23:01-24:00, Wed., 15 Apr. 0.0460 0.0383 0.0422
22:01-23:00, Wed., 15 Apr. 0.0503 0.0407 0.0454
21:01-22:00, Wed., 15 Apr. 0.0508 0.0438 0.0474
20:01-21:00, Wed., 15 Apr. 0.0503 0.0387 0.0448
19:01-20:00, Wed., 15 Apr. 0.0439 0.0354 0.0393
18:01-19:00, Wed., 15 Apr. 0.0408 0.0344 0.0369
17:01-18:00, Wed., 15 Apr. 0.0377 0.0338 0.0357
16:01-17:00, Wed., 15 Apr. 0.0377 0.0338 0.0356
15:01-16:00, Wed., 15 Apr. 0.0373 0.0334 0.0357
14:01-15:00, Wed., 15 Apr. 0.0387 0.0330 0.0356
13:01-14:00, Wed., 15 Apr. 0.0388 0.0340 0.0358
12:01-13:00, Wed., 15 Apr. 0.0389 0.0341 0.0358
11:01-12:00, Wed., 15 Apr. 0.0378 0.0336 0.0358
10:01-11:00, Wed., 15 Apr. 0.0392 0.0339 0.0359
09:01-10:00, Wed., 15 Apr. 0.0382 0.0341 0.0358
08:01-09:00, Wed., 15 Apr. 0.0395 0.0345 0.0363
07:01-08:00, Wed., 15 Apr. 0.0386 0.0334 0.0362
06:01-07:00, Wed., 15 Apr. 0.0389 0.0338 0.0358
05:01-06:00, Wed., 15 Apr. 0.0376 0.0328 0.0358
04:01-05:00, Wed., 15 Apr. 0.0386 0.0343 0.0359
03:01-04:00, Wed., 15 Apr. 0.0396 0.0343 0.0363
02:01-03:00, Wed., 15 Apr. 0.0385 0.0336 0.0359
01:01-02:00, Wed., 15 Apr. 0.0384 0.0340 0.0359
00:01-01:00, Wed., 15 Apr. 0.0373 0.0334 0.0358
23:01-24:00, Tue., 14 Apr. 0.0385 0.0333 0.0356
22:01-23:00, Tue., 14 Apr. 0.0399 0.0339 0.0358
21:01-22:00, Tue., 14 Apr. 0.0374 0.0335 0.0356
20:01-21:00, Tue., 14 Apr. 0.0385 0.0329 0.0360
19:01-20:00, Tue., 14 Apr. 0.0384 0.0336 0.0358
18:01-19:00, Tue., 14 Apr. 0.0386 0.0334 0.0361
17:01-18:00, Tue., 14 Apr. 0.0374 0.0332 0.0356
16:01-17:00, Tue., 14 Apr. 0.0389 0.0343 0.0357
15:01-16:00, Tue., 14 Apr. 0.0378 0.0342 0.0357
14:01-15:00, Tue., 14 Apr. 0.0390 0.0330 0.0358
13:01-14:00, Tue., 14 Apr. 0.0379 0.0339 0.0357
12:01-13:00, Tue., 14 Apr. 0.0381 0.0334 0.0358
11:01-12:00, Tue., 14 Apr. 0.0390 0.0337 0.0359
10:01-11:00, Tue., 14 Apr. 0.0383 0.0340 0.0361
09:01-10:00, Tue., 14 Apr. 0.0376 0.0340 0.0359
08:01-09:00, Tue., 14 Apr. 0.0406 0.0340 0.0362
07:01-08:00, Tue., 14 Apr. 0.0398 0.0346 0.0366
06:01-07:00, Tue., 14 Apr. 0.0392 0.0337 0.0366
05:01-06:00, Tue., 14 Apr. 0.0396 0.0342 0.0364
04:01-05:00, Tue., 14 Apr. 0.0395 0.0338 0.0359
03:01-04:00, Tue., 14 Apr. 0.0390 0.0337 0.0359
02:01-03:00, Tue., 14 Apr. 0.0396 0.0342 0.0362
01:01-02:00, Tue., 14 Apr. 0.0384 0.0344 0.0358
00:01-01:00, Tue., 14 Apr. 0.0402 0.0340 0.0360
23:01-24:00, Mon., 13 Apr. 0.0389 0.0336 0.0358
22:01-23:00, Mon., 13 Apr. 0.0384 0.0339 0.0357
21:01-22:00, Mon., 13 Apr. 0.0376 0.0340 0.0356
20:01-21:00, Mon., 13 Apr. 0.0392 0.0340 0.0357
19:01-20:00, Mon., 13 Apr. 0.0383 0.0339 0.0359
18:01-19:00, Mon., 13 Apr. 0.0375 0.0329 0.0357
17:01-18:00, Mon., 13 Apr. 0.0396 0.0339 0.0359
16:01-17:00, Mon., 13 Apr. 0.0385 0.0337 0.0358
15:01-16:00, Mon., 13 Apr. 0.0383 0.0340 0.0359
14:01-15:00, Mon., 13 Apr. 0.0393 0.0335 0.0359
13:01-14:00, Mon., 13 Apr. 0.0382 0.0340 0.0357
12:01-13:00, Mon., 13 Apr. 0.0381 0.0330 0.0358
11:01-12:00, Mon., 13 Apr. 0.0396 0.0338 0.0358
10:01-11:00, Mon., 13 Apr. 0.0388 0.0342 0.0364
09:01-10:00, Mon., 13 Apr. 0.0381 0.0345 0.0362
08:01-09:00, Mon., 13 Apr. 0.0393 0.0337 0.0365
07:01-08:00, Mon., 13 Apr. 0.0393 0.0343 0.0366
06:01-07:00, Mon., 13 Apr. 0.0385 0.0347 0.0363
05:01-06:00, Mon., 13 Apr. 0.0393 0.0344 0.0362
04:01-05:00, Mon., 13 Apr. 0.0399 0.0340 0.0363
03:01-04:00, Mon., 13 Apr. 0.0406 0.0345 0.0363
02:01-03:00, Mon., 13 Apr. 0.0383 0.0342 0.0361
01:01-02:00, Mon., 13 Apr. 0.0378 0.0341 0.0359
00:01-01:00, Mon., 13 Apr. 0.0383 0.0340 0.0360
23:01-24:00, Sun., 12 Apr. 0.0394 0.0332 0.0360
22:01-23:00, Sun., 12 Apr. 0.0391 0.0334 0.0357
21:01-22:00, Sun., 12 Apr. 0.0380 0.0336 0.0359
20:01-21:00, Sun., 12 Apr. 0.0377 0.0341 0.0358
19:01-20:00, Sun., 12 Apr. 0.0397 0.0338 0.0358
18:01-19:00, Sun., 12 Apr. 0.0401 0.0341 0.0360
17:01-18:00, Sun., 12 Apr. 0.0393 0.0343 0.0362
16:01-17:00, Sun., 12 Apr. 0.0382 0.0339 0.0357
15:01-16:00, Sun., 12 Apr. 0.0396 0.0346 0.0363
14:01-15:00, Sun., 12 Apr. 0.0393 0.0335 0.0362
13:01-14:00, Sun., 12 Apr. 0.0380 0.0338 0.0359
12:01-13:00, Sun., 12 Apr. 0.0414 0.0342 0.0361
11:01-12:00, Sun., 12 Apr. 0.0404 0.0335 0.0366
10:01-11:00, Sun., 12 Apr. 0.0393 0.0336 0.0361
09:01-10:00, Sun., 12 Apr. 0.0382 0.0335 0.0359
08:01-09:00, Sun., 12 Apr. 0.0383 0.0342 0.0358
07:01-08:00, Sun., 12 Apr. 0.0387 0.0340 0.0359
06:01-07:00, Sun., 12 Apr. 0.0398 0.0340 0.0359
05:01-06:00, Sun., 12 Apr. 0.0391 0.0342 0.0361
04:01-05:00, Sun., 12 Apr. 0.0381 0.0341 0.0360
03:01-04:00, Sun., 12 Apr. 0.0380 0.0340 0.0360
02:01-03:00, Sun., 12 Apr. 0.0371 0.0342 0.0358
01:01-02:00, Sun., 12 Apr. 0.0386 0.0341 0.0361
00:01-01:00, Sun., 12 Apr. 0.0404 0.0338 0.0358
23:01-24:00, Sat., 11 Apr. 0.0384 0.0338 0.0361
22:01-23:00, Sat., 11 Apr. 0.0385 0.0340 0.0363
21:01-22:00, Sat., 11 Apr. 0.0382 0.0350 0.0364
20:01-21:00, Sat., 11 Apr. 0.0380 0.0339 0.0359
19:01-20:00, Sat., 11 Apr. 0.0373 0.0344 0.0361
18:01-19:00, Sat., 11 Apr. 0.0393 0.0332 0.0360
17:01-18:00, Sat., 11 Apr. 0.0375 0.0335 0.0358
16:01-17:00, Sat., 11 Apr. 0.0387 0.0328 0.0363
15:01-16:00, Sat., 11 Apr. 0.0399 0.0345 0.0362
14:01-15:00, Sat., 11 Apr. 0.0402 0.0342 0.0362
13:01-14:00, Sat., 11 Apr. 0.0389 0.0339 0.0363
12:01-13:00, Sat., 11 Apr. 0.0390 0.0342 0.0363
11:01-12:00, Sat., 11 Apr. 0.0399 0.0338 0.0362
10:01-11:00, Sat., 11 Apr. 0.0394 0.0341 0.0366
09:01-10:00, Sat., 11 Apr. 0.0400 0.0348 0.0366
08:01-09:00, Sat., 11 Apr. 0.0401 0.0344 0.0369
07:01-08:00, Sat., 11 Apr. 0.0413 0.0341 0.0371
06:01-07:00, Sat., 11 Apr. 0.0391 0.0345 0.0368
05:01-06:00, Sat., 11 Apr. 0.0403 0.0346 0.0364
04:01-05:00, Sat., 11 Apr. 0.0391 0.0337 0.0360
03:01-04:00, Sat., 11 Apr. 0.0390 0.0340 0.0360
02:01-03:00, Sat., 11 Apr. 0.0387 0.0333 0.0358
01:01-02:00, Sat., 11 Apr. 0.0392 0.0341 0.0358
00:01-01:00, Sat., 11 Apr. 0.0386 0.0340 0.0360
23:01-24:00, Fri., 10 Apr. 0.0383 0.0332 0.0358
22:01-23:00, Fri., 10 Apr. 0.0396 0.0336 0.0363
21:01-22:00, Fri., 10 Apr. 0.0422 0.0352 0.0388
20:01-21:00, Fri., 10 Apr. 0.0520 0.0413 0.0458