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, Fri., 13 Feb. 0.0398 0.0338 0.0359
18:01-19:00, Fri., 13 Feb. 0.0391 0.0341 0.0362
17:01-18:00, Fri., 13 Feb. 0.0371 0.0334 0.0357
16:01-17:00, Fri., 13 Feb. 0.0383 0.0330 0.0359
15:01-16:00, Fri., 13 Feb. 0.0383 0.0341 0.0361
14:01-15:00, Fri., 13 Feb. 0.0403 0.0344 0.0360
13:01-14:00, Fri., 13 Feb. 0.0387 0.0342 0.0361
12:01-13:00, Fri., 13 Feb. 0.0386 0.0338 0.0360
11:01-12:00, Fri., 13 Feb. 0.0410 0.0346 0.0363
10:01-11:00, Fri., 13 Feb. 0.0397 0.0340 0.0367
09:01-10:00, Fri., 13 Feb. 0.0399 0.0343 0.0366
08:01-09:00, Fri., 13 Feb. 0.0400 0.0348 0.0363
07:01-08:00, Fri., 13 Feb. 0.0395 0.0345 0.0368
06:01-07:00, Fri., 13 Feb. 0.0400 0.0353 0.0369
05:01-06:00, Fri., 13 Feb. 0.0399 0.0345 0.0366
04:01-05:00, Fri., 13 Feb. 0.0397 0.0346 0.0365
03:01-04:00, Fri., 13 Feb. 0.0402 0.0344 0.0363
02:01-03:00, Fri., 13 Feb. 0.0391 0.0344 0.0364
01:01-02:00, Fri., 13 Feb. 0.0413 0.0342 0.0366
00:01-01:00, Fri., 13 Feb. 0.0401 0.0340 0.0364
23:01-24:00, Thu., 12 Feb. 0.0387 0.0338 0.0360
22:01-23:00, Thu., 12 Feb. 0.0393 0.0331 0.0356
21:01-22:00, Thu., 12 Feb. 0.0394 0.0334 0.0362
20:01-21:00, Thu., 12 Feb. 0.0399 0.0338 0.0362
19:01-20:00, Thu., 12 Feb. 0.0400 0.0334 0.0361
18:01-19:00, Thu., 12 Feb. 0.0379 0.0334 0.0357
17:01-18:00, Thu., 12 Feb. 0.0380 0.0333 0.0359
16:01-17:00, Thu., 12 Feb. 0.0390 0.0334 0.0361
15:01-16:00, Thu., 12 Feb. 0.0379 0.0339 0.0357
14:01-15:00, Thu., 12 Feb. 0.0380 0.0329 0.0356
13:01-14:00, Thu., 12 Feb. 0.0386 0.0337 0.0360
12:01-13:00, Thu., 12 Feb. 0.0380 0.0333 0.0357
11:01-12:00, Thu., 12 Feb. 0.0400 0.0342 0.0361
10:01-11:00, Thu., 12 Feb. 0.0385 0.0328 0.0356
09:01-10:00, Thu., 12 Feb. 0.0394 0.0340 0.0359
08:01-09:00, Thu., 12 Feb. 0.0391 0.0338 0.0357
07:01-08:00, Thu., 12 Feb. 0.0383 0.0331 0.0354
06:01-07:00, Thu., 12 Feb. 0.0375 0.0341 0.0358
05:01-06:00, Thu., 12 Feb. 0.0388 0.0338 0.0361
04:01-05:00, Thu., 12 Feb. 0.0385 0.0337 0.0358
03:01-04:00, Thu., 12 Feb. 0.0383 0.0332 0.0358
02:01-03:00, Thu., 12 Feb. 0.0389 0.0335 0.0357
01:01-02:00, Thu., 12 Feb. 0.0379 0.0337 0.0357
00:01-01:00, Thu., 12 Feb. 0.0369 0.0336 0.0354
23:01-24:00, Wed., 11 Feb. 0.0372 0.0327 0.0356
22:01-23:00, Wed., 11 Feb. 0.0376 0.0337 0.0355
21:01-22:00, Wed., 11 Feb. 0.0388 0.0326 0.0358
20:01-21:00, Wed., 11 Feb. 0.0382 0.0332 0.0355
19:01-20:00, Wed., 11 Feb. 0.0392 0.0338 0.0359
18:01-19:00, Wed., 11 Feb. 0.0399 0.0345 0.0367
17:01-18:00, Wed., 11 Feb. 0.0415 0.0348 0.0374
16:01-17:00, Wed., 11 Feb. 0.0401 0.0344 0.0365
15:01-16:00, Wed., 11 Feb. 0.0393 0.0345 0.0366
14:01-15:00, Wed., 11 Feb. 0.0400 0.0350 0.0369
13:01-14:00, Wed., 11 Feb. 0.0455 0.0351 0.0396
12:01-13:00, Wed., 11 Feb. 0.0527 0.0411 0.0467
11:01-12:00, Wed., 11 Feb. 0.0552 0.0473 0.0513
10:01-11:00, Wed., 11 Feb. 0.0528 0.0447 0.0490
09:01-10:00, Wed., 11 Feb. 0.0529 0.0448 0.0484
08:01-09:00, Wed., 11 Feb. 0.0536 0.0436 0.0484
07:01-08:00, Wed., 11 Feb. 0.0522 0.0436 0.0485
06:01-07:00, Wed., 11 Feb. 0.0482 0.0376 0.0422
05:01-06:00, Wed., 11 Feb. 0.0423 0.0353 0.0379
04:01-05:00, Wed., 11 Feb. 0.0401 0.0350 0.0371
03:01-04:00, Wed., 11 Feb. 0.0397 0.0342 0.0362
02:01-03:00, Wed., 11 Feb. 0.0380 0.0335 0.0357
01:01-02:00, Wed., 11 Feb. 0.0384 0.0334 0.0358
00:01-01:00, Wed., 11 Feb. 0.0401 0.0336 0.0360
23:01-24:00, Tue., 10 Feb. 0.0387 0.0336 0.0359
22:01-23:00, Tue., 10 Feb. 0.0391 0.0334 0.0361
21:01-22:00, Tue., 10 Feb. 0.0395 0.0343 0.0360
20:01-21:00, Tue., 10 Feb. 0.0389 0.0336 0.0361
19:01-20:00, Tue., 10 Feb. 0.0373 0.0339 0.0357
18:01-19:00, Tue., 10 Feb. 0.0387 0.0334 0.0361
17:01-18:00, Tue., 10 Feb. 0.0379 0.0337 0.0357
16:01-17:00, Tue., 10 Feb. 0.0392 0.0338 0.0358
15:01-16:00, Tue., 10 Feb. 0.0376 0.0335 0.0355
14:01-15:00, Tue., 10 Feb. 0.0381 0.0330 0.0358
13:01-14:00, Tue., 10 Feb. 0.0396 0.0334 0.0359
12:01-13:00, Tue., 10 Feb. 0.0383 0.0335 0.0359
11:01-12:00, Tue., 10 Feb. 0.0383 0.0337 0.0357
10:01-11:00, Tue., 10 Feb. 0.0374 0.0340 0.0357
09:01-10:00, Tue., 10 Feb. 0.0387 0.0337 0.0361
08:01-09:00, Tue., 10 Feb. 0.0388 0.0331 0.0357
07:01-08:00, Tue., 10 Feb. 0.0390 0.0332 0.0360
06:01-07:00, Tue., 10 Feb. 0.0387 0.0337 0.0359
05:01-06:00, Tue., 10 Feb. 0.0384 0.0332 0.0357
04:01-05:00, Tue., 10 Feb. 0.0389 0.0331 0.0356
03:01-04:00, Tue., 10 Feb. 0.0388 0.0335 0.0358
02:01-03:00, Tue., 10 Feb. 0.0375 0.0334 0.0355
01:01-02:00, Tue., 10 Feb. 0.0381 0.0326 0.0357
00:01-01:00, Tue., 10 Feb. 0.0369 0.0331 0.0352
23:01-24:00, Mon., 09 Feb. 0.0382 0.0334 0.0354
22:01-23:00, Mon., 09 Feb. 0.0371 0.0325 0.0352
21:01-22:00, Mon., 09 Feb. 0.0374 0.0338 0.0353
20:01-21:00, Mon., 09 Feb. 0.0387 0.0330 0.0353
19:01-20:00, Mon., 09 Feb. 0.0374 0.0329 0.0350
18:01-19:00, Mon., 09 Feb. 0.0374 0.0335 0.0354
17:01-18:00, Mon., 09 Feb. 0.0369 0.0338 0.0353
16:01-17:00, Mon., 09 Feb. 0.0389 0.0329 0.0352
15:01-16:00, Mon., 09 Feb. 0.0373 0.0328 0.0355
14:01-15:00, Mon., 09 Feb. 0.0371 0.0340 0.0357
13:01-14:00, Mon., 09 Feb. 0.0388 0.0343 0.0358
12:01-13:00, Mon., 09 Feb. 0.0395 0.0328 0.0353
11:01-12:00, Mon., 09 Feb. 0.0377 0.0329 0.0354
10:01-11:00, Mon., 09 Feb. 0.0381 0.0328 0.0356
09:01-10:00, Mon., 09 Feb. 0.0369 0.0327 0.0354
08:01-09:00, Mon., 09 Feb. 0.0378 0.0332 0.0355
07:01-08:00, Mon., 09 Feb. 0.0385 0.0336 0.0357
06:01-07:00, Mon., 09 Feb. 0.0394 0.0337 0.0358
05:01-06:00, Mon., 09 Feb. 0.0374 0.0320 0.0356
04:01-05:00, Mon., 09 Feb. 0.0383 0.0333 0.0353
03:01-04:00, Mon., 09 Feb. 0.0377 0.0336 0.0356
02:01-03:00, Mon., 09 Feb. 0.0382 0.0338 0.0357
01:01-02:00, Mon., 09 Feb. 0.0395 0.0332 0.0358
00:01-01:00, Mon., 09 Feb. 0.0387 0.0340 0.0359
23:01-24:00, Sun., 08 Feb. 0.0380 0.0339 0.0355
22:01-23:00, Sun., 08 Feb. 0.0388 0.0327 0.0358
21:01-22:00, Sun., 08 Feb. 0.0393 0.0338 0.0358
20:01-21:00, Sun., 08 Feb. 0.0377 0.0340 0.0356
19:01-20:00, Sun., 08 Feb. 0.0374 0.0333 0.0355
18:01-19:00, Sun., 08 Feb. 0.0373 0.0332 0.0354
17:01-18:00, Sun., 08 Feb. 0.0371 0.0333 0.0356
16:01-17:00, Sun., 08 Feb. 0.0392 0.0332 0.0357
15:01-16:00, Sun., 08 Feb. 0.0381 0.0330 0.0356
14:01-15:00, Sun., 08 Feb. 0.0376 0.0335 0.0357
13:01-14:00, Sun., 08 Feb. 0.0402 0.0335 0.0360
12:01-13:00, Sun., 08 Feb. 0.0425 0.0352 0.0382
11:01-12:00, Sun., 08 Feb. 0.0455 0.0376 0.0402
10:01-11:00, Sun., 08 Feb. 0.0445 0.0361 0.0401
09:01-10:00, Sun., 08 Feb. 0.0434 0.0356 0.0381
08:01-09:00, Sun., 08 Feb. 0.0393 0.0348 0.0366
07:01-08:00, Sun., 08 Feb. 0.0411 0.0344 0.0366
06:01-07:00, Sun., 08 Feb. 0.0408 0.0357 0.0383
05:01-06:00, Sun., 08 Feb. 0.0443 0.0375 0.0406
04:01-05:00, Sun., 08 Feb. 0.0423 0.0360 0.0395
03:01-04:00, Sun., 08 Feb. 0.0447 0.0371 0.0415
02:01-03:00, Sun., 08 Feb. 0.0494 0.0402 0.0440
01:01-02:00, Sun., 08 Feb. 0.0451 0.0361 0.0405
00:01-01:00, Sun., 08 Feb. 0.0425 0.0348 0.0371
23:01-24:00, Sat., 07 Feb. 0.0428 0.0364 0.0401
22:01-23:00, Sat., 07 Feb. 0.0436 0.0377 0.0402
21:01-22:00, Sat., 07 Feb. 0.0422 0.0358 0.0386
20:01-21:00, Sat., 07 Feb. 0.0410 0.0338 0.0367
19:01-20:00, Sat., 07 Feb. 0.0403 0.0351 0.0368
18:01-19:00, Sat., 07 Feb. 0.0397 0.0343 0.0361
17:01-18:00, Sat., 07 Feb. 0.0394 0.0341 0.0362
16:01-17:00, Sat., 07 Feb. 0.0392 0.0339 0.0364
15:01-16:00, Sat., 07 Feb. 0.0404 0.0346 0.0367
14:01-15:00, Sat., 07 Feb. 0.0441 0.0362 0.0392
13:01-14:00, Sat., 07 Feb. 0.0440 0.0363 0.0405
12:01-13:00, Sat., 07 Feb. 0.0408 0.0353 0.0381
11:01-12:00, Sat., 07 Feb. 0.0414 0.0348 0.0380
10:01-11:00, Sat., 07 Feb. 0.0411 0.0354 0.0375
09:01-10:00, Sat., 07 Feb. 0.0407 0.0352 0.0370
08:01-09:00, Sat., 07 Feb. 0.0398 0.0349 0.0366
07:01-08:00, Sat., 07 Feb. 0.0396 0.0343 0.0366
06:01-07:00, Sat., 07 Feb. 0.0390 0.0348 0.0366
05:01-06:00, Sat., 07 Feb. 0.0402 0.0345 0.0366
04:01-05:00, Sat., 07 Feb. 0.0398 0.0349 0.0368
03:01-04:00, Sat., 07 Feb. 0.0392 0.0346 0.0365
02:01-03:00, Sat., 07 Feb. 0.0397 0.0342 0.0367
01:01-02:00, Sat., 07 Feb. 0.0397 0.0346 0.0365
00:01-01:00, Sat., 07 Feb. 0.0407 0.0344 0.0365
23:01-24:00, Fri., 06 Feb. 0.0385 0.0337 0.0360
22:01-23:00, Fri., 06 Feb. 0.0406 0.0344 0.0363
21:01-22:00, Fri., 06 Feb. 0.0397 0.0343 0.0365
20:01-21:00, Fri., 06 Feb. 0.0404 0.0347 0.0364
19:01-20:00, Fri., 06 Feb. 0.0397 0.0341 0.0364
18:01-19:00, Fri., 06 Feb. 0.0393 0.0352 0.0366
17:01-18:00, Fri., 06 Feb. 0.0414 0.0349 0.0367
16:01-17:00, Fri., 06 Feb. 0.0391 0.0346 0.0367
15:01-16:00, Fri., 06 Feb. 0.0406 0.0347 0.0366
14:01-15:00, Fri., 06 Feb. 0.0395 0.0341 0.0362
13:01-14:00, Fri., 06 Feb. 0.0413 0.0348 0.0367
12:01-13:00, Fri., 06 Feb. 0.0396 0.0346 0.0366
11:01-12:00, Fri., 06 Feb. 0.0410 0.0355 0.0372
10:01-11:00, Fri., 06 Feb. 0.0399 0.0351 0.0372
09:01-10:00, Fri., 06 Feb. 0.0417 0.0356 0.0381
08:01-09:00, Fri., 06 Feb. 0.0420 0.0359 0.0380
07:01-08:00, Fri., 06 Feb. 0.0401 0.0352 0.0374
06:01-07:00, Fri., 06 Feb. 0.0417 0.0351 0.0374
05:01-06:00, Fri., 06 Feb. 0.0393 0.0345 0.0368
04:01-05:00, Fri., 06 Feb. 0.0390 0.0351 0.0367
03:01-04:00, Fri., 06 Feb. 0.0392 0.0345 0.0368
02:01-03:00, Fri., 06 Feb. 0.0398 0.0346 0.0366
01:01-02:00, Fri., 06 Feb. 0.0399 0.0352 0.0368
00:01-01:00, Fri., 06 Feb. 0.0406 0.0348 0.0370
23:01-24:00, Thu., 05 Feb. 0.0412 0.0345 0.0371
22:01-23:00, Thu., 05 Feb. 0.0390 0.0344 0.0365
21:01-22:00, Thu., 05 Feb. 0.0386 0.0336 0.0360
20:01-21:00, Thu., 05 Feb. 0.0388 0.0345 0.0361
19:01-20:00, Thu., 05 Feb. 0.0390 0.0344 0.0362
18:01-19:00, Thu., 05 Feb. 0.0401 0.0335 0.0363
17:01-18:00, Thu., 05 Feb. 0.0403 0.0339 0.0362
16:01-17:00, Thu., 05 Feb. 0.0384 0.0347 0.0362
15:01-16:00, Thu., 05 Feb. 0.0398 0.0345 0.0365
14:01-15:00, Thu., 05 Feb. 0.0405 0.0343 0.0367
13:01-14:00, Thu., 05 Feb. 0.0415 0.0350 0.0372
12:01-13:00, Thu., 05 Feb. 0.0393 0.0350 0.0366
11:01-12:00, Thu., 05 Feb. 0.0397 0.0345 0.0370
10:01-11:00, Thu., 05 Feb. 0.0420 0.0352 0.0376
09:01-10:00, Thu., 05 Feb. 0.0408 0.0359 0.0376
08:01-09:00, Thu., 05 Feb. 0.0408 0.0351 0.0376
07:01-08:00, Thu., 05 Feb. 0.0420 0.0358 0.0381
06:01-07:00, Thu., 05 Feb. 0.0409 0.0356 0.0372
05:01-06:00, Thu., 05 Feb. 0.0421 0.0350 0.0370
04:01-05:00, Thu., 05 Feb. 0.0409 0.0351 0.0370
03:01-04:00, Thu., 05 Feb. 0.0396 0.0348 0.0368
02:01-03:00, Thu., 05 Feb. 0.0408 0.0344 0.0367
01:01-02:00, Thu., 05 Feb. 0.0392 0.0344 0.0364
00:01-01:00, Thu., 05 Feb. 0.0390 0.0350 0.0368
23:01-24:00, Wed., 04 Feb. 0.0404 0.0341 0.0368
22:01-23:00, Wed., 04 Feb. 0.0384 0.0343 0.0364
21:01-22:00, Wed., 04 Feb. 0.0383 0.0345 0.0364
20:01-21:00, Wed., 04 Feb. 0.0394 0.0343 0.0363
19:01-20:00, Wed., 04 Feb. 0.0390 0.0337 0.0364
18:01-19:00, Wed., 04 Feb. 0.0412 0.0346 0.0364
17:01-18:00, Wed., 04 Feb. 0.0400 0.0330 0.0360
16:01-17:00, Wed., 04 Feb. 0.0383 0.0342 0.0362
15:01-16:00, Wed., 04 Feb. 0.0410 0.0338 0.0362
14:01-15:00, Wed., 04 Feb. 0.0379 0.0338 0.0362
13:01-14:00, Wed., 04 Feb. 0.0408 0.0338 0.0364
12:01-13:00, Wed., 04 Feb. 0.0385 0.0343 0.0363
11:01-12:00, Wed., 04 Feb. 0.0400 0.0340 0.0362
10:01-11:00, Wed., 04 Feb. 0.0394 0.0343 0.0365
09:01-10:00, Wed., 04 Feb. 0.0413 0.0344 0.0365
08:01-09:00, Wed., 04 Feb. 0.0393 0.0347 0.0367
07:01-08:00, Wed., 04 Feb. 0.0395 0.0342 0.0368
06:01-07:00, Wed., 04 Feb. 0.0395 0.0346 0.0364
05:01-06:00, Wed., 04 Feb. 0.0390 0.0344 0.0364
04:01-05:00, Wed., 04 Feb. 0.0390 0.0343 0.0365
03:01-04:00, Wed., 04 Feb. 0.0393 0.0334 0.0365
02:01-03:00, Wed., 04 Feb. 0.0394 0.0339 0.0365
01:01-02:00, Wed., 04 Feb. 0.0394 0.0335 0.0359
00:01-01:00, Wed., 04 Feb. 0.0385 0.0332 0.0358
23:01-24:00, Tue., 03 Feb. 0.0399 0.0342 0.0360
22:01-23:00, Tue., 03 Feb. 0.0381 0.0340 0.0359
21:01-22:00, Tue., 03 Feb. 0.0388 0.0339 0.0358
20:01-21:00, Tue., 03 Feb. 0.0385 0.0332 0.0361