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
12:01-13:00, Sat., 20 Apr. 0.0396 0.0345 0.0364
11:01-12:00, Sat., 20 Apr. 0.0379 0.0341 0.0362
10:01-11:00, Sat., 20 Apr. 0.0395 0.0345 0.0363
09:01-10:00, Sat., 20 Apr. 0.0402 0.0352 0.0368
08:01-09:00, Sat., 20 Apr. 0.0402 0.0345 0.0367
07:01-08:00, Sat., 20 Apr. 0.0390 0.0345 0.0367
06:01-07:00, Sat., 20 Apr. 0.0393 0.0342 0.0366
05:01-06:00, Sat., 20 Apr. 0.0397 0.0337 0.0365
04:01-05:00, Sat., 20 Apr. 0.0393 0.0333 0.0364
03:01-04:00, Sat., 20 Apr. 0.0395 0.0342 0.0365
02:01-03:00, Sat., 20 Apr. 0.0398 0.0343 0.0362
01:01-02:00, Sat., 20 Apr. 0.0393 0.0336 0.0362
00:01-01:00, Sat., 20 Apr. 0.0398 0.0350 0.0363
23:01-24:00, Fri., 19 Apr. 0.0393 0.0341 0.0364
22:01-23:00, Fri., 19 Apr. 0.0391 0.0341 0.0364
21:01-22:00, Fri., 19 Apr. 0.0387 0.0343 0.0360
20:01-21:00, Fri., 19 Apr. 0.0393 0.0340 0.0365
19:01-20:00, Fri., 19 Apr. 0.0389 0.0343 0.0365
18:01-19:00, Fri., 19 Apr. 0.0391 0.0345 0.0366
17:01-18:00, Fri., 19 Apr. 0.0384 0.0343 0.0362
16:01-17:00, Fri., 19 Apr. 0.0393 0.0338 0.0365
15:01-16:00, Fri., 19 Apr. 0.0402 0.0340 0.0365
14:01-15:00, Fri., 19 Apr. 0.0390 0.0350 0.0367
13:01-14:00, Fri., 19 Apr. 0.0397 0.0345 0.0365
12:01-13:00, Fri., 19 Apr. 0.0404 0.0345 0.0365
11:01-12:00, Fri., 19 Apr. 0.0399 0.0342 0.0366
10:01-11:00, Fri., 19 Apr. 0.0394 0.0333 0.0364
09:01-10:00, Fri., 19 Apr. 0.0401 0.0333 0.0363
08:01-09:00, Fri., 19 Apr. 0.0383 0.0346 0.0362
07:01-08:00, Fri., 19 Apr. 0.0388 0.0339 0.0361
06:01-07:00, Fri., 19 Apr. 0.0398 0.0338 0.0362
05:01-06:00, Fri., 19 Apr. 0.0402 0.0344 0.0364
04:01-05:00, Fri., 19 Apr. 0.0395 0.0344 0.0365
03:01-04:00, Fri., 19 Apr. 0.0390 0.0332 0.0364
02:01-03:00, Fri., 19 Apr. 0.0393 0.0343 0.0366
01:01-02:00, Fri., 19 Apr. 0.0392 0.0349 0.0368
00:01-01:00, Fri., 19 Apr. 0.0416 0.0357 0.0377
23:01-24:00, Thu., 18 Apr. 0.0400 0.0343 0.0371
22:01-23:00, Thu., 18 Apr. 0.0461 0.0360 0.0394
21:01-22:00, Thu., 18 Apr. 0.0444 0.0378 0.0406
20:01-21:00, Thu., 18 Apr. 0.0454 0.0391 0.0423
19:01-20:00, Thu., 18 Apr. 0.0431 0.0365 0.0400
18:01-19:00, Thu., 18 Apr. 0.0410 0.0346 0.0373
17:01-18:00, Thu., 18 Apr. 0.0387 0.0339 0.0361
16:01-17:00, Thu., 18 Apr. 0.0403 0.0346 0.0365
15:01-16:00, Thu., 18 Apr. 0.0395 0.0344 0.0363
14:01-15:00, Thu., 18 Apr. 0.0398 0.0346 0.0363
13:01-14:00, Thu., 18 Apr. 0.0386 0.0328 0.0363
12:01-13:00, Thu., 18 Apr. 0.0390 0.0342 0.0364
11:01-12:00, Thu., 18 Apr. 0.0401 0.0344 0.0364
10:01-11:00, Thu., 18 Apr. 0.0401 0.0350 0.0364
09:01-10:00, Thu., 18 Apr. 0.0391 0.0344 0.0364
08:01-09:00, Thu., 18 Apr. 0.0391 0.0344 0.0363
07:01-08:00, Thu., 18 Apr. 0.0389 0.0342 0.0364
06:01-07:00, Thu., 18 Apr. 0.0402 0.0346 0.0365
05:01-06:00, Thu., 18 Apr. 0.0381 0.0347 0.0365
04:01-05:00, Thu., 18 Apr. 0.0399 0.0342 0.0363
03:01-04:00, Thu., 18 Apr. 0.0387 0.0336 0.0361
02:01-03:00, Thu., 18 Apr. 0.0394 0.0335 0.0362
01:01-02:00, Thu., 18 Apr. 0.0400 0.0337 0.0361
00:01-01:00, Thu., 18 Apr. 0.0399 0.0335 0.0362
23:01-24:00, Wed., 17 Apr. 0.0410 0.0339 0.0362
22:01-23:00, Wed., 17 Apr. 0.0391 0.0338 0.0361
21:01-22:00, Wed., 17 Apr. 0.0372 0.0332 0.0358
20:01-21:00, Wed., 17 Apr. 0.0396 0.0342 0.0360
19:01-20:00, Wed., 17 Apr. 0.0385 0.0341 0.0361
18:01-19:00, Wed., 17 Apr. 0.0381 0.0337 0.0358
17:01-18:00, Wed., 17 Apr. 0.0390 0.0333 0.0359
16:01-17:00, Wed., 17 Apr. 0.0388 0.0343 0.0361
15:01-16:00, Wed., 17 Apr. 0.0396 0.0339 0.0359
14:01-15:00, Wed., 17 Apr. 0.0378 0.0336 0.0356
13:01-14:00, Wed., 17 Apr. 0.0383 0.0338 0.0358
12:01-13:00, Wed., 17 Apr. 0.0374 0.0339 0.0356
11:01-12:00, Wed., 17 Apr. 0.0386 0.0339 0.0360
10:01-11:00, Wed., 17 Apr. 0.0388 0.0335 0.0358
09:01-10:00, Wed., 17 Apr. 0.0388 0.0341 0.0358
08:01-09:00, Wed., 17 Apr. 0.0388 0.0337 0.0361
07:01-08:00, Wed., 17 Apr. 0.0397 0.0342 0.0362
06:01-07:00, Wed., 17 Apr. 0.0391 0.0336 0.0359
05:01-06:00, Wed., 17 Apr. 0.0387 0.0332 0.0357
04:01-05:00, Wed., 17 Apr. 0.0391 0.0332 0.0358
03:01-04:00, Wed., 17 Apr. 0.0382 0.0340 0.0363
02:01-03:00, Wed., 17 Apr. 0.0379 0.0342 0.0361
01:01-02:00, Wed., 17 Apr. 0.0403 0.0334 0.0357
00:01-01:00, Wed., 17 Apr. 0.0380 0.0337 0.0357
23:01-24:00, Tue., 16 Apr. 0.0374 0.0328 0.0356
22:01-23:00, Tue., 16 Apr. 0.0374 0.0339 0.0357
21:01-22:00, Tue., 16 Apr. 0.0395 0.0337 0.0357
20:01-21:00, Tue., 16 Apr. 0.0370 0.0327 0.0355
19:01-20:00, Tue., 16 Apr. 0.0383 0.0329 0.0357
18:01-19:00, Tue., 16 Apr. 0.0373 0.0338 0.0358
17:01-18:00, Tue., 16 Apr. 0.0382 0.0338 0.0357
16:01-17:00, Tue., 16 Apr. 0.0389 0.0332 0.0358
15:01-16:00, Tue., 16 Apr. 0.0385 0.0329 0.0358
14:01-15:00, Tue., 16 Apr. 0.0380 0.0341 0.0356
13:01-14:00, Tue., 16 Apr. 0.0394 0.0338 0.0356
12:01-13:00, Tue., 16 Apr. 0.0374 0.0334 0.0357
11:01-12:00, Tue., 16 Apr. 0.0376 0.0340 0.0357
10:01-11:00, Tue., 16 Apr. 0.0392 0.0331 0.0357
09:01-10:00, Tue., 16 Apr. 0.0374 0.0327 0.0355
08:01-09:00, Tue., 16 Apr. 0.0385 0.0335 0.0357
07:01-08:00, Tue., 16 Apr. 0.0375 0.0337 0.0358
06:01-07:00, Tue., 16 Apr. 0.0387 0.0335 0.0357
05:01-06:00, Tue., 16 Apr. 0.0387 0.0333 0.0356
04:01-05:00, Tue., 16 Apr. 0.0384 0.0331 0.0354
03:01-04:00, Tue., 16 Apr. 0.0385 0.0340 0.0360
02:01-03:00, Tue., 16 Apr. 0.0378 0.0336 0.0355
01:01-02:00, Tue., 16 Apr. 0.0379 0.0335 0.0358
00:01-01:00, Tue., 16 Apr. 0.0381 0.0337 0.0355
23:01-24:00, Mon., 15 Apr. 0.0374 0.0335 0.0356
22:01-23:00, Mon., 15 Apr. 0.0374 0.0339 0.0356
21:01-22:00, Mon., 15 Apr. 0.0380 0.0339 0.0354
20:01-21:00, Mon., 15 Apr. 0.0373 0.0342 0.0355
19:01-20:00, Mon., 15 Apr. 0.0380 0.0334 0.0356
18:01-19:00, Mon., 15 Apr. 0.0384 0.0340 0.0359
17:01-18:00, Mon., 15 Apr. 0.0383 0.0331 0.0357
16:01-17:00, Mon., 15 Apr. 0.0386 0.0340 0.0357
15:01-16:00, Mon., 15 Apr. 0.0371 0.0341 0.0359
14:01-15:00, Mon., 15 Apr. 0.0384 0.0334 0.0359
13:01-14:00, Mon., 15 Apr. 0.0379 0.0335 0.0355
12:01-13:00, Mon., 15 Apr. 0.0382 0.0335 0.0355
11:01-12:00, Mon., 15 Apr. 0.0385 0.0339 0.0359
10:01-11:00, Mon., 15 Apr. 0.0388 0.0324 0.0357
09:01-10:00, Mon., 15 Apr. 0.0387 0.0342 0.0362
08:01-09:00, Mon., 15 Apr. 0.0398 0.0343 0.0365
07:01-08:00, Mon., 15 Apr. 0.0396 0.0346 0.0365
06:01-07:00, Mon., 15 Apr. 0.0382 0.0344 0.0363
05:01-06:00, Mon., 15 Apr. 0.0376 0.0340 0.0359
04:01-05:00, Mon., 15 Apr. 0.0388 0.0341 0.0358
03:01-04:00, Mon., 15 Apr. 0.0378 0.0334 0.0356
02:01-03:00, Mon., 15 Apr. 0.0372 0.0332 0.0355
01:01-02:00, Mon., 15 Apr. 0.0373 0.0342 0.0356
00:01-01:00, Mon., 15 Apr. 0.0375 0.0336 0.0356
23:01-24:00, Sun., 14 Apr. 0.0381 0.0340 0.0359
22:01-23:00, Sun., 14 Apr. 0.0381 0.0336 0.0356
21:01-22:00, Sun., 14 Apr. 0.0382 0.0337 0.0356
20:01-21:00, Sun., 14 Apr. 0.0372 0.0334 0.0355
19:01-20:00, Sun., 14 Apr. 0.0379 0.0334 0.0356
18:01-19:00, Sun., 14 Apr. 0.0385 0.0340 0.0358
17:01-18:00, Sun., 14 Apr. 0.0388 0.0333 0.0357
16:01-17:00, Sun., 14 Apr. 0.0378 0.0334 0.0355
15:01-16:00, Sun., 14 Apr. 0.0374 0.0335 0.0355
14:01-15:00, Sun., 14 Apr. 0.0378 0.0331 0.0357
13:01-14:00, Sun., 14 Apr. 0.0387 0.0328 0.0357
12:01-13:00, Sun., 14 Apr. 0.0399 0.0338 0.0357
11:01-12:00, Sun., 14 Apr. 0.0379 0.0335 0.0359
10:01-11:00, Sun., 14 Apr. 0.0381 0.0335 0.0359
09:01-10:00, Sun., 14 Apr. 0.0399 0.0332 0.0358
08:01-09:00, Sun., 14 Apr. 0.0376 0.0330 0.0358
07:01-08:00, Sun., 14 Apr. 0.0381 0.0336 0.0357
06:01-07:00, Sun., 14 Apr. 0.0380 0.0334 0.0357
05:01-06:00, Sun., 14 Apr. 0.0387 0.0334 0.0357
04:01-05:00, Sun., 14 Apr. 0.0402 0.0336 0.0357
03:01-04:00, Sun., 14 Apr. 0.0380 0.0333 0.0357
02:01-03:00, Sun., 14 Apr. 0.0386 0.0334 0.0356
01:01-02:00, Sun., 14 Apr. 0.0387 0.0336 0.0356
00:01-01:00, Sun., 14 Apr. 0.0380 0.0330 0.0354
23:01-24:00, Sat., 13 Apr. 0.0382 0.0338 0.0356
22:01-23:00, Sat., 13 Apr. 0.0375 0.0328 0.0353
21:01-22:00, Sat., 13 Apr. 0.0380 0.0331 0.0355
20:01-21:00, Sat., 13 Apr. 0.0390 0.0330 0.0354
19:01-20:00, Sat., 13 Apr. 0.0388 0.0336 0.0354
18:01-19:00, Sat., 13 Apr. 0.0372 0.0325 0.0353
17:01-18:00, Sat., 13 Apr. 0.0398 0.0335 0.0357
16:01-17:00, Sat., 13 Apr. 0.0386 0.0335 0.0358
15:01-16:00, Sat., 13 Apr. 0.0384 0.0335 0.0358
14:01-15:00, Sat., 13 Apr. 0.0381 0.0327 0.0356
13:01-14:00, Sat., 13 Apr. 0.0382 0.0336 0.0360
12:01-13:00, Sat., 13 Apr. 0.0388 0.0336 0.0360
11:01-12:00, Sat., 13 Apr. 0.0376 0.0337 0.0356
10:01-11:00, Sat., 13 Apr. 0.0387 0.0345 0.0358
09:01-10:00, Sat., 13 Apr. 0.0388 0.0341 0.0359
08:01-09:00, Sat., 13 Apr. 0.0381 0.0335 0.0358
07:01-08:00, Sat., 13 Apr. 0.0387 0.0340 0.0359
06:01-07:00, Sat., 13 Apr. 0.0386 0.0334 0.0360
05:01-06:00, Sat., 13 Apr. 0.0403 0.0338 0.0363
04:01-05:00, Sat., 13 Apr. 0.0384 0.0337 0.0358
03:01-04:00, Sat., 13 Apr. 0.0379 0.0333 0.0355
02:01-03:00, Sat., 13 Apr. 0.0389 0.0336 0.0355
01:01-02:00, Sat., 13 Apr. 0.0380 0.0327 0.0356
00:01-01:00, Sat., 13 Apr. 0.0374 0.0333 0.0356
23:01-24:00, Fri., 12 Apr. 0.0372 0.0326 0.0352
22:01-23:00, Fri., 12 Apr. 0.0376 0.0330 0.0352
21:01-22:00, Fri., 12 Apr. 0.0372 0.0334 0.0354
20:01-21:00, Fri., 12 Apr. 0.0390 0.0329 0.0355
19:01-20:00, Fri., 12 Apr. 0.0371 0.0331 0.0353
18:01-19:00, Fri., 12 Apr. 0.0379 0.0334 0.0354
17:01-18:00, Fri., 12 Apr. 0.0390 0.0329 0.0355
16:01-17:00, Fri., 12 Apr. 0.0371 0.0334 0.0357
15:01-16:00, Fri., 12 Apr. 0.0378 0.0337 0.0358
14:01-15:00, Fri., 12 Apr. 0.0414 0.0342 0.0361
13:01-14:00, Fri., 12 Apr. 0.0404 0.0339 0.0368
12:01-13:00, Fri., 12 Apr. 0.0419 0.0344 0.0381
11:01-12:00, Fri., 12 Apr. 0.0397 0.0340 0.0363
10:01-11:00, Fri., 12 Apr. 0.0372 0.0335 0.0357
09:01-10:00, Fri., 12 Apr. 0.0371 0.0340 0.0357
08:01-09:00, Fri., 12 Apr. 0.0373 0.0344 0.0359
07:01-08:00, Fri., 12 Apr. 0.0389 0.0337 0.0358
06:01-07:00, Fri., 12 Apr. 0.0390 0.0342 0.0357
05:01-06:00, Fri., 12 Apr. 0.0382 0.0328 0.0356
04:01-05:00, Fri., 12 Apr. 0.0402 0.0334 0.0358
03:01-04:00, Fri., 12 Apr. 0.0386 0.0338 0.0357
02:01-03:00, Fri., 12 Apr. 0.0374 0.0324 0.0353
01:01-02:00, Fri., 12 Apr. 0.0379 0.0331 0.0353
00:01-01:00, Fri., 12 Apr. 0.0373 0.0325 0.0352
23:01-24:00, Thu., 11 Apr. 0.0369 0.0325 0.0351
22:01-23:00, Thu., 11 Apr. 0.0372 0.0328 0.0354
21:01-22:00, Thu., 11 Apr. 0.0372 0.0331 0.0354
20:01-21:00, Thu., 11 Apr. 0.0385 0.0326 0.0353
19:01-20:00, Thu., 11 Apr. 0.0379 0.0332 0.0355
18:01-19:00, Thu., 11 Apr. 0.0377 0.0332 0.0357
17:01-18:00, Thu., 11 Apr. 0.0377 0.0332 0.0355
16:01-17:00, Thu., 11 Apr. 0.0371 0.0328 0.0355
15:01-16:00, Thu., 11 Apr. 0.0381 0.0329 0.0358
14:01-15:00, Thu., 11 Apr. 0.0389 0.0337 0.0356
13:01-14:00, Thu., 11 Apr. 0.0390 0.0334 0.0355
12:01-13:00, Thu., 11 Apr. 0.0370 0.0338 0.0357
11:01-12:00, Thu., 11 Apr. 0.0385 0.0339 0.0356
10:01-11:00, Thu., 11 Apr. 0.0381 0.0341 0.0356
09:01-10:00, Thu., 11 Apr. 0.0373 0.0333 0.0356
08:01-09:00, Thu., 11 Apr. 0.0381 0.0329 0.0357
07:01-08:00, Thu., 11 Apr. 0.0388 0.0339 0.0358
06:01-07:00, Thu., 11 Apr. 0.0389 0.0330 0.0354
05:01-06:00, Thu., 11 Apr. 0.0377 0.0331 0.0354
04:01-05:00, Thu., 11 Apr. 0.0378 0.0335 0.0353
03:01-04:00, Thu., 11 Apr. 0.0384 0.0334 0.0355
02:01-03:00, Thu., 11 Apr. 0.0384 0.0327 0.0354
01:01-02:00, Thu., 11 Apr. 0.0382 0.0328 0.0357
00:01-01:00, Thu., 11 Apr. 0.0394 0.0331 0.0354
23:01-24:00, Wed., 10 Apr. 0.0372 0.0322 0.0352
22:01-23:00, Wed., 10 Apr. 0.0384 0.0328 0.0356
21:01-22:00, Wed., 10 Apr. 0.0376 0.0329 0.0352
20:01-21:00, Wed., 10 Apr. 0.0372 0.0328 0.0354
19:01-20:00, Wed., 10 Apr. 0.0372 0.0329 0.0351
18:01-19:00, Wed., 10 Apr. 0.0382 0.0331 0.0353
17:01-18:00, Wed., 10 Apr. 0.0377 0.0329 0.0354
16:01-17:00, Wed., 10 Apr. 0.0370 0.0328 0.0354
15:01-16:00, Wed., 10 Apr. 0.0371 0.0337 0.0356
14:01-15:00, Wed., 10 Apr. 0.0382 0.0336 0.0356
13:01-14:00, Wed., 10 Apr. 0.0396 0.0334 0.0356