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
00:01-01:00, Fri., 23 Oct. 0.0399 0.0336 0.0365
23:01-24:00, Thu., 22 Oct. 0.0391 0.0343 0.0363
22:01-23:00, Thu., 22 Oct. 0.0403 0.0340 0.0366
21:01-22:00, Thu., 22 Oct. 0.0401 0.0334 0.0365
20:01-21:00, Thu., 22 Oct. 0.0396 0.0340 0.0364
19:01-20:00, Thu., 22 Oct. 0.0396 0.0344 0.0365
18:01-19:00, Thu., 22 Oct. 0.0384 0.0350 0.0364
17:01-18:00, Thu., 22 Oct. 0.0398 0.0341 0.0364
16:01-17:00, Thu., 22 Oct. 0.0391 0.0348 0.0362
15:01-16:00, Thu., 22 Oct. 0.0396 0.0349 0.0365
14:01-15:00, Thu., 22 Oct. 0.0394 0.0336 0.0364
13:01-14:00, Thu., 22 Oct. 0.0401 0.0338 0.0366
12:01-13:00, Thu., 22 Oct. 0.0413 0.0341 0.0367
11:01-12:00, Thu., 22 Oct. 0.0387 0.0349 0.0365
10:01-11:00, Thu., 22 Oct. 0.0389 0.0338 0.0365
09:01-10:00, Thu., 22 Oct. 0.0403 0.0347 0.0366
08:01-09:00, Thu., 22 Oct. 0.0391 0.0348 0.0368
07:01-08:00, Thu., 22 Oct. 0.0399 0.0345 0.0366
06:01-07:00, Thu., 22 Oct. 0.0409 0.0349 0.0367
05:01-06:00, Thu., 22 Oct. 0.0399 0.0347 0.0366
04:01-05:00, Thu., 22 Oct. 0.0386 0.0338 0.0364
03:01-04:00, Thu., 22 Oct. 0.0402 0.0346 0.0368
02:01-03:00, Thu., 22 Oct. 0.0402 0.0341 0.0366
01:01-02:00, Thu., 22 Oct. 0.0390 0.0348 0.0367
00:01-01:00, Thu., 22 Oct. 0.0405 0.0344 0.0371
23:01-24:00, Wed., 21 Oct. 0.0400 0.0350 0.0369
22:01-23:00, Wed., 21 Oct. 0.0390 0.0338 0.0358
21:01-22:00, Wed., 21 Oct. 0.0373 0.0335 0.0359
20:01-21:00, Wed., 21 Oct. 0.0380 0.0337 0.0357
19:01-20:00, Wed., 21 Oct. 0.0387 0.0334 0.0358
18:01-19:00, Wed., 21 Oct. 0.0388 0.0330 0.0358
17:01-18:00, Wed., 21 Oct. 0.0396 0.0329 0.0361
16:01-17:00, Wed., 21 Oct. 0.0386 0.0341 0.0360
15:01-16:00, Wed., 21 Oct. 0.0370 0.0341 0.0356
14:01-15:00, Wed., 21 Oct. 0.0377 0.0339 0.0358
13:01-14:00, Wed., 21 Oct. 0.0389 0.0338 0.0358
12:01-13:00, Wed., 21 Oct. 0.0375 0.0342 0.0358
11:01-12:00, Wed., 21 Oct. 0.0404 0.0339 0.0357
10:01-11:00, Wed., 21 Oct. 0.0373 0.0331 0.0354
09:01-10:00, Wed., 21 Oct. 0.0395 0.0338 0.0357
08:01-09:00, Wed., 21 Oct. 0.0403 0.0343 0.0364
07:01-08:00, Wed., 21 Oct. 0.0403 0.0343 0.0365
06:01-07:00, Wed., 21 Oct. 0.0411 0.0349 0.0367
05:01-06:00, Wed., 21 Oct. 0.0408 0.0342 0.0368
04:01-05:00, Wed., 21 Oct. 0.0392 0.0345 0.0367
03:01-04:00, Wed., 21 Oct. 0.0394 0.0347 0.0366
02:01-03:00, Wed., 21 Oct. 0.0413 0.0343 0.0367
01:01-02:00, Wed., 21 Oct. 0.0399 0.0347 0.0366
00:01-01:00, Wed., 21 Oct. 0.0406 0.0340 0.0365
23:01-24:00, Tue., 20 Oct. 0.0394 0.0342 0.0366
22:01-23:00, Tue., 20 Oct. 0.0406 0.0347 0.0367
21:01-22:00, Tue., 20 Oct. 0.0398 0.0342 0.0366
20:01-21:00, Tue., 20 Oct. 0.0402 0.0340 0.0366
19:01-20:00, Tue., 20 Oct. 0.0408 0.0341 0.0366
18:01-19:00, Tue., 20 Oct. 0.0416 0.0350 0.0370
17:01-18:00, Tue., 20 Oct. 0.0395 0.0351 0.0367
16:01-17:00, Tue., 20 Oct. 0.0400 0.0351 0.0371
15:01-16:00, Tue., 20 Oct. 0.0410 0.0346 0.0369
14:01-15:00, Tue., 20 Oct. 0.0402 0.0348 0.0371
13:01-14:00, Tue., 20 Oct. 0.0423 0.0353 0.0374
12:01-13:00, Tue., 20 Oct. 0.0408 0.0355 0.0373
11:01-12:00, Tue., 20 Oct. 0.0399 0.0348 0.0372
10:01-11:00, Tue., 20 Oct. 0.0397 0.0351 0.0370
09:01-10:00, Tue., 20 Oct. 0.0411 0.0351 0.0373
08:01-09:00, Tue., 20 Oct. 0.0411 0.0346 0.0371
07:01-08:00, Tue., 20 Oct. 0.0397 0.0346 0.0371
06:01-07:00, Tue., 20 Oct. 0.0399 0.0350 0.0370
05:01-06:00, Tue., 20 Oct. 0.0404 0.0356 0.0374
04:01-05:00, Tue., 20 Oct. 0.0406 0.0344 0.0370
03:01-04:00, Tue., 20 Oct. 0.0413 0.0347 0.0371
02:01-03:00, Tue., 20 Oct. 0.0395 0.0351 0.0368
01:01-02:00, Tue., 20 Oct. 0.0392 0.0347 0.0368
00:01-01:00, Tue., 20 Oct. 0.0393 0.0350 0.0368
23:01-24:00, Mon., 19 Oct. 0.0398 0.0349 0.0367
22:01-23:00, Mon., 19 Oct. 0.0384 0.0347 0.0367
21:01-22:00, Mon., 19 Oct. 0.0394 0.0347 0.0368
20:01-21:00, Mon., 19 Oct. 0.0381 0.0338 0.0361
19:01-20:00, Mon., 19 Oct. 0.0398 0.0331 0.0363
18:01-19:00, Mon., 19 Oct. 0.0393 0.0340 0.0361
17:01-18:00, Mon., 19 Oct. 0.0393 0.0341 0.0361
16:01-17:00, Mon., 19 Oct. 0.0396 0.0345 0.0362
15:01-16:00, Mon., 19 Oct. 0.0399 0.0340 0.0361
14:01-15:00, Mon., 19 Oct. 0.0390 0.0340 0.0360
13:01-14:00, Mon., 19 Oct. 0.0384 0.0343 0.0361
12:01-13:00, Mon., 19 Oct. 0.0380 0.0341 0.0359
11:01-12:00, Mon., 19 Oct. 0.0384 0.0338 0.0358
10:01-11:00, Mon., 19 Oct. 0.0384 0.0337 0.0361
09:01-10:00, Mon., 19 Oct. 0.0393 0.0335 0.0364
08:01-09:00, Mon., 19 Oct. 0.0416 0.0341 0.0365
07:01-08:00, Mon., 19 Oct. 0.0381 0.0340 0.0361
06:01-07:00, Mon., 19 Oct. 0.0399 0.0347 0.0363
05:01-06:00, Mon., 19 Oct. 0.0393 0.0338 0.0359
04:01-05:00, Mon., 19 Oct. 0.0390 0.0341 0.0362
03:01-04:00, Mon., 19 Oct. 0.0380 0.0338 0.0361
02:01-03:00, Mon., 19 Oct. 0.0398 0.0334 0.0363
01:01-02:00, Mon., 19 Oct. 0.0395 0.0336 0.0363
00:01-01:00, Mon., 19 Oct. 0.0388 0.0327 0.0361
23:01-24:00, Sun., 18 Oct. 0.0393 0.0338 0.0362
22:01-23:00, Sun., 18 Oct. 0.0388 0.0344 0.0359
21:01-22:00, Sun., 18 Oct. 0.0420 0.0339 0.0364
20:01-21:00, Sun., 18 Oct. 0.0386 0.0336 0.0360
19:01-20:00, Sun., 18 Oct. 0.0403 0.0342 0.0361
18:01-19:00, Sun., 18 Oct. 0.0382 0.0335 0.0363
17:01-18:00, Sun., 18 Oct. 0.0391 0.0344 0.0362
16:01-17:00, Sun., 18 Oct. 0.0415 0.0344 0.0365
15:01-16:00, Sun., 18 Oct. 0.0391 0.0347 0.0365
14:01-15:00, Sun., 18 Oct. 0.0398 0.0339 0.0363
13:01-14:00, Sun., 18 Oct. 0.0397 0.0343 0.0363
12:01-13:00, Sun., 18 Oct. 0.0393 0.0347 0.0362
11:01-12:00, Sun., 18 Oct. 0.0396 0.0346 0.0368
10:01-11:00, Sun., 18 Oct. 0.0410 0.0343 0.0371
09:01-10:00, Sun., 18 Oct. 0.0400 0.0343 0.0371
08:01-09:00, Sun., 18 Oct. 0.0416 0.0345 0.0370
07:01-08:00, Sun., 18 Oct. 0.0403 0.0352 0.0371
06:01-07:00, Sun., 18 Oct. 0.0409 0.0353 0.0371
05:01-06:00, Sun., 18 Oct. 0.0405 0.0342 0.0370
04:01-05:00, Sun., 18 Oct. 0.0400 0.0351 0.0371
03:01-04:00, Sun., 18 Oct. 0.0407 0.0345 0.0368
02:01-03:00, Sun., 18 Oct. 0.0405 0.0342 0.0365
01:01-02:00, Sun., 18 Oct. 0.0391 0.0336 0.0365
00:01-01:00, Sun., 18 Oct. 0.0392 0.0346 0.0364
23:01-24:00, Sat., 17 Oct. 0.0392 0.0347 0.0365
22:01-23:00, Sat., 17 Oct. 0.0388 0.0336 0.0363
21:01-22:00, Sat., 17 Oct. 0.0401 0.0339 0.0363
20:01-21:00, Sat., 17 Oct. 0.0391 0.0345 0.0363
19:01-20:00, Sat., 17 Oct. 0.0400 0.0338 0.0362
18:01-19:00, Sat., 17 Oct. 0.0401 0.0340 0.0365
17:01-18:00, Sat., 17 Oct. 0.0391 0.0343 0.0363
16:01-17:00, Sat., 17 Oct. 0.0386 0.0319 0.0356
15:01-16:00, Sat., 17 Oct. 0.0377 0.0317 0.0342
14:01-15:00, Sat., 17 Oct. 0.0455 0.0343 0.0367
08:01-09:00, Sat., 17 Oct. 0.0400 0.0345 0.0361
07:01-08:00, Sat., 17 Oct. 0.0403 0.0336 0.0361
06:01-07:00, Sat., 17 Oct. 0.0381 0.0339 0.0361
05:01-06:00, Sat., 17 Oct. 0.0374 0.0335 0.0359
04:01-05:00, Sat., 17 Oct. 0.0378 0.0340 0.0360
03:01-04:00, Sat., 17 Oct. 0.0389 0.0340 0.0362
02:01-03:00, Sat., 17 Oct. 0.0386 0.0346 0.0362
01:01-02:00, Sat., 17 Oct. 0.0400 0.0346 0.0364
00:01-01:00, Sat., 17 Oct. 0.0387 0.0342 0.0362
23:01-24:00, Fri., 16 Oct. 0.0399 0.0341 0.0362
22:01-23:00, Fri., 16 Oct. 0.0404 0.0337 0.0364
21:01-22:00, Fri., 16 Oct. 0.0380 0.0344 0.0358
20:01-21:00, Fri., 16 Oct. 0.0374 0.0339 0.0357
19:01-20:00, Fri., 16 Oct. 0.0384 0.0341 0.0358
18:01-19:00, Fri., 16 Oct. 0.0407 0.0345 0.0363
17:01-18:00, Fri., 16 Oct. 0.0381 0.0346 0.0359
16:01-17:00, Fri., 16 Oct. 0.0403 0.0334 0.0361
15:01-16:00, Fri., 16 Oct. 0.0387 0.0337 0.0360
14:01-15:00, Fri., 16 Oct. 0.0383 0.0342 0.0361
13:01-14:00, Fri., 16 Oct. 0.0392 0.0339 0.0360
12:01-13:00, Fri., 16 Oct. 0.0397 0.0348 0.0363
11:01-12:00, Fri., 16 Oct. 0.0389 0.0337 0.0362
10:01-11:00, Fri., 16 Oct. 0.0406 0.0343 0.0362
09:01-10:00, Fri., 16 Oct. 0.0398 0.0344 0.0366
08:01-09:00, Fri., 16 Oct. 0.0389 0.0347 0.0365
07:01-08:00, Fri., 16 Oct. 0.0380 0.0346 0.0362
06:01-07:00, Fri., 16 Oct. 0.0395 0.0341 0.0363
05:01-06:00, Fri., 16 Oct. 0.0401 0.0345 0.0363
04:01-05:00, Fri., 16 Oct. 0.0393 0.0343 0.0363
03:01-04:00, Fri., 16 Oct. 0.0384 0.0346 0.0364
02:01-03:00, Fri., 16 Oct. 0.0392 0.0340 0.0362
01:01-02:00, Fri., 16 Oct. 0.0386 0.0341 0.0363
00:01-01:00, Fri., 16 Oct. 0.0404 0.0346 0.0361
23:01-24:00, Thu., 15 Oct. 0.0394 0.0340 0.0362
22:01-23:00, Thu., 15 Oct. 0.0387 0.0333 0.0359
21:01-22:00, Thu., 15 Oct. 0.0384 0.0337 0.0360
20:01-21:00, Thu., 15 Oct. 0.0379 0.0336 0.0360
19:01-20:00, Thu., 15 Oct. 0.0385 0.0327 0.0361
18:01-19:00, Thu., 15 Oct. 0.0383 0.0339 0.0364
17:01-18:00, Thu., 15 Oct. 0.0390 0.0335 0.0360
16:01-17:00, Thu., 15 Oct. 0.0385 0.0328 0.0357
15:01-16:00, Thu., 15 Oct. 0.0408 0.0335 0.0362
14:01-15:00, Thu., 15 Oct. 0.0383 0.0340 0.0362
13:01-14:00, Thu., 15 Oct. 0.0378 0.0345 0.0359
12:01-13:00, Thu., 15 Oct. 0.0392 0.0332 0.0363
11:01-12:00, Thu., 15 Oct. 0.0380 0.0329 0.0359
10:01-11:00, Thu., 15 Oct. 0.0381 0.0343 0.0361
09:01-10:00, Thu., 15 Oct. 0.0383 0.0344 0.0364
08:01-09:00, Thu., 15 Oct. 0.0387 0.0343 0.0362
07:01-08:00, Thu., 15 Oct. 0.0386 0.0338 0.0363
06:01-07:00, Thu., 15 Oct. 0.0377 0.0347 0.0362
05:01-06:00, Thu., 15 Oct. 0.0387 0.0339 0.0361
04:01-05:00, Thu., 15 Oct. 0.0382 0.0341 0.0360
03:01-04:00, Thu., 15 Oct. 0.0397 0.0337 0.0364
02:01-03:00, Thu., 15 Oct. 0.0389 0.0345 0.0362
01:01-02:00, Thu., 15 Oct. 0.0394 0.0351 0.0368
00:01-01:00, Thu., 15 Oct. 0.0399 0.0347 0.0364
23:01-24:00, Wed., 14 Oct. 0.0392 0.0344 0.0366
22:01-23:00, Wed., 14 Oct. 0.0395 0.0352 0.0367
21:01-22:00, Wed., 14 Oct. 0.0399 0.0338 0.0366
20:01-21:00, Wed., 14 Oct. 0.0388 0.0345 0.0363
19:01-20:00, Wed., 14 Oct. 0.0392 0.0343 0.0363
18:01-19:00, Wed., 14 Oct. 0.0381 0.0344 0.0362
17:01-18:00, Wed., 14 Oct. 0.0405 0.0342 0.0366
16:01-17:00, Wed., 14 Oct. 0.0401 0.0345 0.0363
15:01-16:00, Wed., 14 Oct. 0.0380 0.0334 0.0363
14:01-15:00, Wed., 14 Oct. 0.0389 0.0346 0.0366
13:01-14:00, Wed., 14 Oct. 0.0397 0.0347 0.0367
12:01-13:00, Wed., 14 Oct. 0.0406 0.0354 0.0377
11:01-12:00, Wed., 14 Oct. 0.0418 0.0348 0.0373
10:01-11:00, Wed., 14 Oct. 0.0400 0.0336 0.0362
09:01-10:00, Wed., 14 Oct. 0.0414 0.0343 0.0366
08:01-09:00, Wed., 14 Oct. 0.0400 0.0346 0.0367
07:01-08:00, Wed., 14 Oct. 0.0394 0.0347 0.0369
06:01-07:00, Wed., 14 Oct. 0.0415 0.0344 0.0371
05:01-06:00, Wed., 14 Oct. 0.0395 0.0351 0.0369
04:01-05:00, Wed., 14 Oct. 0.0401 0.0342 0.0364
03:01-04:00, Wed., 14 Oct. 0.0392 0.0348 0.0365
02:01-03:00, Wed., 14 Oct. 0.0381 0.0344 0.0362
01:01-02:00, Wed., 14 Oct. 0.0410 0.0342 0.0362
00:01-01:00, Wed., 14 Oct. 0.0395 0.0342 0.0364
23:01-24:00, Tue., 13 Oct. 0.0397 0.0338 0.0363
22:01-23:00, Tue., 13 Oct. 0.0392 0.0349 0.0366
21:01-22:00, Tue., 13 Oct. 0.0384 0.0341 0.0361
20:01-21:00, Tue., 13 Oct. 0.0380 0.0335 0.0361
19:01-20:00, Tue., 13 Oct. 0.0401 0.0344 0.0364
18:01-19:00, Tue., 13 Oct. 0.0405 0.0351 0.0367
17:01-18:00, Tue., 13 Oct. 0.0399 0.0344 0.0370
16:01-17:00, Tue., 13 Oct. 0.0414 0.0348 0.0375
15:01-16:00, Tue., 13 Oct. 0.0384 0.0344 0.0361
14:01-15:00, Tue., 13 Oct. 0.0390 0.0337 0.0361
13:01-14:00, Tue., 13 Oct. 0.0426 0.0339 0.0361
12:01-13:00, Tue., 13 Oct. 0.0422 0.0354 0.0376
11:01-12:00, Tue., 13 Oct. 0.0433 0.0335 0.0374
10:01-11:00, Tue., 13 Oct. 0.0382 0.0336 0.0360
09:01-10:00, Tue., 13 Oct. 0.0393 0.0344 0.0364
08:01-09:00, Tue., 13 Oct. 0.0392 0.0337 0.0361
07:01-08:00, Tue., 13 Oct. 0.0391 0.0344 0.0361
06:01-07:00, Tue., 13 Oct. 0.0400 0.0338 0.0366
05:01-06:00, Tue., 13 Oct. 0.0394 0.0338 0.0363
04:01-05:00, Tue., 13 Oct. 0.0406 0.0344 0.0361
03:01-04:00, Tue., 13 Oct. 0.0391 0.0338 0.0362
02:01-03:00, Tue., 13 Oct. 0.0388 0.0346 0.0362
01:01-02:00, Tue., 13 Oct. 0.0379 0.0341 0.0361
00:01-01:00, Tue., 13 Oct. 0.0383 0.0336 0.0360
23:01-24:00, Mon., 12 Oct. 0.0384 0.0327 0.0357
22:01-23:00, Mon., 12 Oct. 0.0393 0.0344 0.0361
21:01-22:00, Mon., 12 Oct. 0.0399 0.0335 0.0358
20:01-21:00, Mon., 12 Oct. 0.0386 0.0342 0.0360