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.

【News about this monitoring post】

We will suspend the provision of data in part or whole of the following time slots by interruption of power supply and relevant facilities due to maintenance and inspection of equipment.

From 9:00 to 13:00 on Tuesday, June 26,2018 Hachioji
From 13:00 to 17:00 on Thursday, June 26,2018 Adachi
From 9:00 to 13:00 on Wednesday, June 27,2018 Chofu
From 13:00 to 17:00 on Wednesday, June 27,2018 Ota
From 9:00 to 13:00 on Thursday, June 28,2018 Kodaira 
From 13:00 to 17:00 on Thursday, June 28,2018 Edogawa
From 9:00 to 13:00 on Friday, June 29,2018 Shinjuku







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
20:01-21:00, Thu., 20 Sep. 0.0508 0.0444 0.0472
19:01-20:00, Thu., 20 Sep. 0.0487 0.0399 0.0434
18:01-19:00, Thu., 20 Sep. 0.0478 0.0404 0.0438
17:01-18:00, Thu., 20 Sep. 0.0564 0.0441 0.0491
16:01-17:00, Thu., 20 Sep. 0.0573 0.0496 0.0538
15:01-16:00, Thu., 20 Sep. 0.0535 0.0452 0.0489
14:01-15:00, Thu., 20 Sep. 0.0465 0.0367 0.0416
13:01-14:00, Thu., 20 Sep. 0.0418 0.0338 0.0374
12:01-13:00, Thu., 20 Sep. 0.0403 0.0348 0.0371
11:01-12:00, Thu., 20 Sep. 0.0418 0.0352 0.0372
10:01-11:00, Thu., 20 Sep. 0.0401 0.0352 0.0373
09:01-10:00, Thu., 20 Sep. 0.0402 0.0349 0.0372
08:01-09:00, Thu., 20 Sep. 0.0400 0.0345 0.0372
07:01-08:00, Thu., 20 Sep. 0.0399 0.0347 0.0373
06:01-07:00, Thu., 20 Sep. 0.0408 0.0348 0.0370
05:01-06:00, Thu., 20 Sep. 0.0406 0.0350 0.0371
04:01-05:00, Thu., 20 Sep. 0.0422 0.0341 0.0372
03:01-04:00, Thu., 20 Sep. 0.0402 0.0342 0.0369
02:01-03:00, Thu., 20 Sep. 0.0400 0.0351 0.0370
01:01-02:00, Thu., 20 Sep. 0.0410 0.0350 0.0371
00:01-01:00, Thu., 20 Sep. 0.0406 0.0352 0.0372
23:01-24:00, Wed., 19 Sep. 0.0393 0.0355 0.0367
22:01-23:00, Wed., 19 Sep. 0.0413 0.0345 0.0369
21:01-22:00, Wed., 19 Sep. 0.0394 0.0342 0.0367
20:01-21:00, Wed., 19 Sep. 0.0397 0.0334 0.0363
19:01-20:00, Wed., 19 Sep. 0.0411 0.0329 0.0367
18:01-19:00, Wed., 19 Sep. 0.0412 0.0341 0.0368
17:01-18:00, Wed., 19 Sep. 0.0390 0.0351 0.0368
16:01-17:00, Wed., 19 Sep. 0.0399 0.0344 0.0370
15:01-16:00, Wed., 19 Sep. 0.0399 0.0337 0.0366
14:01-15:00, Wed., 19 Sep. 0.0394 0.0345 0.0367
13:01-14:00, Wed., 19 Sep. 0.0400 0.0348 0.0367
12:01-13:00, Wed., 19 Sep. 0.0401 0.0353 0.0368
11:01-12:00, Wed., 19 Sep. 0.0381 0.0348 0.0365
10:01-11:00, Wed., 19 Sep. 0.0404 0.0348 0.0370
09:01-10:00, Wed., 19 Sep. 0.0405 0.0350 0.0370
08:01-09:00, Wed., 19 Sep. 0.0400 0.0353 0.0370
07:01-08:00, Wed., 19 Sep. 0.0392 0.0343 0.0368
06:01-07:00, Wed., 19 Sep. 0.0406 0.0343 0.0368
05:01-06:00, Wed., 19 Sep. 0.0397 0.0346 0.0370
04:01-05:00, Wed., 19 Sep. 0.0396 0.0345 0.0369
03:01-04:00, Wed., 19 Sep. 0.0385 0.0332 0.0365
02:01-03:00, Wed., 19 Sep. 0.0403 0.0347 0.0368
01:01-02:00, Wed., 19 Sep. 0.0415 0.0344 0.0369
00:01-01:00, Wed., 19 Sep. 0.0427 0.0360 0.0392
23:01-24:00, Tue., 18 Sep. 0.0434 0.0350 0.0390
22:01-23:00, Tue., 18 Sep. 0.0398 0.0349 0.0370
21:01-22:00, Tue., 18 Sep. 0.0408 0.0344 0.0369
20:01-21:00, Tue., 18 Sep. 0.0406 0.0353 0.0374
19:01-20:00, Tue., 18 Sep. 0.0432 0.0360 0.0396
18:01-19:00, Tue., 18 Sep. 0.0457 0.0349 0.0402
17:01-18:00, Tue., 18 Sep. 0.0403 0.0346 0.0366
16:01-17:00, Tue., 18 Sep. 0.0399 0.0348 0.0362
15:01-16:00, Tue., 18 Sep. 0.0384 0.0335 0.0363
14:01-15:00, Tue., 18 Sep. 0.0388 0.0341 0.0364
13:01-14:00, Tue., 18 Sep. 0.0392 0.0347 0.0365
12:01-13:00, Tue., 18 Sep. 0.0385 0.0341 0.0362
11:01-12:00, Tue., 18 Sep. 0.0397 0.0337 0.0363
10:01-11:00, Tue., 18 Sep. 0.0394 0.0345 0.0363
09:01-10:00, Tue., 18 Sep. 0.0397 0.0342 0.0363
08:01-09:00, Tue., 18 Sep. 0.0395 0.0342 0.0365
07:01-08:00, Tue., 18 Sep. 0.0394 0.0339 0.0364
06:01-07:00, Tue., 18 Sep. 0.0390 0.0336 0.0364
05:01-06:00, Tue., 18 Sep. 0.0399 0.0345 0.0366
04:01-05:00, Tue., 18 Sep. 0.0410 0.0347 0.0365
03:01-04:00, Tue., 18 Sep. 0.0402 0.0350 0.0370
02:01-03:00, Tue., 18 Sep. 0.0435 0.0348 0.0382
01:01-02:00, Tue., 18 Sep. 0.0486 0.0379 0.0429
00:01-01:00, Tue., 18 Sep. 0.0512 0.0408 0.0464
23:01-24:00, Mon., 17 Sep. 0.0453 0.0353 0.0395
22:01-23:00, Mon., 17 Sep. 0.0406 0.0349 0.0368
21:01-22:00, Mon., 17 Sep. 0.0420 0.0350 0.0370
20:01-21:00, Mon., 17 Sep. 0.0434 0.0355 0.0395
19:01-20:00, Mon., 17 Sep. 0.0529 0.0405 0.0466
18:01-19:00, Mon., 17 Sep. 0.0691 0.0517 0.0601
17:01-18:00, Mon., 17 Sep. 0.0496 0.0353 0.0377
16:01-17:00, Mon., 17 Sep. 0.0392 0.0344 0.0365
15:01-16:00, Mon., 17 Sep. 0.0404 0.0342 0.0365
14:01-15:00, Mon., 17 Sep. 0.0394 0.0351 0.0366
13:01-14:00, Mon., 17 Sep. 0.0404 0.0346 0.0371
12:01-13:00, Mon., 17 Sep. 0.0404 0.0354 0.0369
11:01-12:00, Mon., 17 Sep. 0.0408 0.0334 0.0372
10:01-11:00, Mon., 17 Sep. 0.0413 0.0355 0.0373
09:01-10:00, Mon., 17 Sep. 0.0403 0.0355 0.0371
08:01-09:00, Mon., 17 Sep. 0.0409 0.0348 0.0369
07:01-08:00, Mon., 17 Sep. 0.0417 0.0353 0.0372
06:01-07:00, Mon., 17 Sep. 0.0397 0.0344 0.0370
05:01-06:00, Mon., 17 Sep. 0.0410 0.0348 0.0366
04:01-05:00, Mon., 17 Sep. 0.0396 0.0345 0.0366
03:01-04:00, Mon., 17 Sep. 0.0393 0.0341 0.0365
02:01-03:00, Mon., 17 Sep. 0.0413 0.0331 0.0366
01:01-02:00, Mon., 17 Sep. 0.0406 0.0343 0.0367
00:01-01:00, Mon., 17 Sep. 0.0396 0.0335 0.0366
23:01-24:00, Sun., 16 Sep. 0.0384 0.0345 0.0365
22:01-23:00, Sun., 16 Sep. 0.0392 0.0348 0.0366
21:01-22:00, Sun., 16 Sep. 0.0403 0.0347 0.0365
20:01-21:00, Sun., 16 Sep. 0.0404 0.0349 0.0366
19:01-20:00, Sun., 16 Sep. 0.0399 0.0338 0.0366
18:01-19:00, Sun., 16 Sep. 0.0388 0.0335 0.0364
17:01-18:00, Sun., 16 Sep. 0.0385 0.0344 0.0363
16:01-17:00, Sun., 16 Sep. 0.0389 0.0346 0.0364
15:01-16:00, Sun., 16 Sep. 0.0393 0.0340 0.0363
14:01-15:00, Sun., 16 Sep. 0.0418 0.0342 0.0364
13:01-14:00, Sun., 16 Sep. 0.0389 0.0341 0.0364
12:01-13:00, Sun., 16 Sep. 0.0390 0.0345 0.0362
11:01-12:00, Sun., 16 Sep. 0.0380 0.0324 0.0362
10:01-11:00, Sun., 16 Sep. 0.0399 0.0347 0.0367
09:01-10:00, Sun., 16 Sep. 0.0413 0.0344 0.0366
08:01-09:00, Sun., 16 Sep. 0.0402 0.0346 0.0367
07:01-08:00, Sun., 16 Sep. 0.0401 0.0346 0.0370
06:01-07:00, Sun., 16 Sep. 0.0392 0.0344 0.0365
05:01-06:00, Sun., 16 Sep. 0.0392 0.0353 0.0366
04:01-05:00, Sun., 16 Sep. 0.0390 0.0345 0.0367
03:01-04:00, Sun., 16 Sep. 0.0405 0.0349 0.0370
02:01-03:00, Sun., 16 Sep. 0.0389 0.0342 0.0367
01:01-02:00, Sun., 16 Sep. 0.0398 0.0346 0.0364
00:01-01:00, Sun., 16 Sep. 0.0390 0.0346 0.0366
23:01-24:00, Sat., 15 Sep. 0.0386 0.0336 0.0364
22:01-23:00, Sat., 15 Sep. 0.0399 0.0351 0.0366
21:01-22:00, Sat., 15 Sep. 0.0387 0.0346 0.0364
20:01-21:00, Sat., 15 Sep. 0.0385 0.0344 0.0361
19:01-20:00, Sat., 15 Sep. 0.0398 0.0336 0.0367
18:01-19:00, Sat., 15 Sep. 0.0406 0.0344 0.0363
17:01-18:00, Sat., 15 Sep. 0.0389 0.0345 0.0365
16:01-17:00, Sat., 15 Sep. 0.0408 0.0346 0.0367
15:01-16:00, Sat., 15 Sep. 0.0395 0.0350 0.0370
14:01-15:00, Sat., 15 Sep. 0.0421 0.0355 0.0383
13:01-14:00, Sat., 15 Sep. 0.0452 0.0367 0.0413
12:01-13:00, Sat., 15 Sep. 0.0457 0.0384 0.0421
11:01-12:00, Sat., 15 Sep. 0.0449 0.0375 0.0410
10:01-11:00, Sat., 15 Sep. 0.0431 0.0373 0.0403
09:01-10:00, Sat., 15 Sep. 0.0433 0.0364 0.0399
08:01-09:00, Sat., 15 Sep. 0.0456 0.0381 0.0412
07:01-08:00, Sat., 15 Sep. 0.0430 0.0338 0.0382
06:01-07:00, Sat., 15 Sep. 0.0393 0.0338 0.0362
05:01-06:00, Sat., 15 Sep. 0.0395 0.0339 0.0362
04:01-05:00, Sat., 15 Sep. 0.0405 0.0352 0.0368
03:01-04:00, Sat., 15 Sep. 0.0391 0.0348 0.0371
02:01-03:00, Sat., 15 Sep. 0.0434 0.0359 0.0387
01:01-02:00, Sat., 15 Sep. 0.0439 0.0351 0.0393
00:01-01:00, Sat., 15 Sep. 0.0422 0.0364 0.0385
23:01-24:00, Fri., 14 Sep. 0.0416 0.0357 0.0381
22:01-23:00, Fri., 14 Sep. 0.0423 0.0356 0.0381
21:01-22:00, Fri., 14 Sep. 0.0414 0.0351 0.0372
20:01-21:00, Fri., 14 Sep. 0.0394 0.0342 0.0360
19:01-20:00, Fri., 14 Sep. 0.0394 0.0337 0.0364
18:01-19:00, Fri., 14 Sep. 0.0386 0.0340 0.0360
17:01-18:00, Fri., 14 Sep. 0.0401 0.0339 0.0361
16:01-17:00, Fri., 14 Sep. 0.0390 0.0338 0.0359
15:01-16:00, Fri., 14 Sep. 0.0385 0.0345 0.0361
14:01-15:00, Fri., 14 Sep. 0.0388 0.0336 0.0359
13:01-14:00, Fri., 14 Sep. 0.0385 0.0340 0.0361
12:01-13:00, Fri., 14 Sep. 0.0385 0.0341 0.0360
11:01-12:00, Fri., 14 Sep. 0.0396 0.0342 0.0362
10:01-11:00, Fri., 14 Sep. 0.0404 0.0350 0.0371
09:01-10:00, Fri., 14 Sep. 0.0430 0.0353 0.0388
08:01-09:00, Fri., 14 Sep. 0.0442 0.0364 0.0401
07:01-08:00, Fri., 14 Sep. 0.0441 0.0365 0.0398
06:01-07:00, Fri., 14 Sep. 0.0415 0.0354 0.0381
05:01-06:00, Fri., 14 Sep. 0.0399 0.0343 0.0366
04:01-05:00, Fri., 14 Sep. 0.0400 0.0345 0.0369
03:01-04:00, Fri., 14 Sep. 0.0409 0.0354 0.0375
02:01-03:00, Fri., 14 Sep. 0.0412 0.0358 0.0382
01:01-02:00, Fri., 14 Sep. 0.0442 0.0372 0.0402
00:01-01:00, Fri., 14 Sep. 0.0440 0.0362 0.0398
23:01-24:00, Thu., 13 Sep. 0.0417 0.0347 0.0382
22:01-23:00, Thu., 13 Sep. 0.0416 0.0352 0.0377
21:01-22:00, Thu., 13 Sep. 0.0427 0.0359 0.0387
20:01-21:00, Thu., 13 Sep. 0.0410 0.0357 0.0380
19:01-20:00, Thu., 13 Sep. 0.0391 0.0342 0.0364
18:01-19:00, Thu., 13 Sep. 0.0389 0.0331 0.0362
17:01-18:00, Thu., 13 Sep. 0.0386 0.0340 0.0360
16:01-17:00, Thu., 13 Sep. 0.0395 0.0343 0.0361
15:01-16:00, Thu., 13 Sep. 0.0372 0.0341 0.0359
14:01-15:00, Thu., 13 Sep. 0.0401 0.0339 0.0363
13:01-14:00, Thu., 13 Sep. 0.0390 0.0340 0.0361
12:01-13:00, Thu., 13 Sep. 0.0380 0.0341 0.0363
11:01-12:00, Thu., 13 Sep. 0.0385 0.0344 0.0362
10:01-11:00, Thu., 13 Sep. 0.0392 0.0344 0.0363
09:01-10:00, Thu., 13 Sep. 0.0400 0.0343 0.0366
08:01-09:00, Thu., 13 Sep. 0.0399 0.0339 0.0367
07:01-08:00, Thu., 13 Sep. 0.0400 0.0348 0.0368
06:01-07:00, Thu., 13 Sep. 0.0394 0.0342 0.0366
05:01-06:00, Thu., 13 Sep. 0.0396 0.0344 0.0365
04:01-05:00, Thu., 13 Sep. 0.0413 0.0344 0.0366
03:01-04:00, Thu., 13 Sep. 0.0406 0.0347 0.0367
02:01-03:00, Thu., 13 Sep. 0.0418 0.0350 0.0366
01:01-02:00, Thu., 13 Sep. 0.0420 0.0343 0.0366
00:01-01:00, Thu., 13 Sep. 0.0394 0.0337 0.0364
23:01-24:00, Wed., 12 Sep. 0.0396 0.0344 0.0367
22:01-23:00, Wed., 12 Sep. 0.0412 0.0345 0.0372
21:01-22:00, Wed., 12 Sep. 0.0424 0.0349 0.0371
20:01-21:00, Wed., 12 Sep. 0.0391 0.0344 0.0364
19:01-20:00, Wed., 12 Sep. 0.0385 0.0339 0.0362
18:01-19:00, Wed., 12 Sep. 0.0389 0.0338 0.0362
17:01-18:00, Wed., 12 Sep. 0.0385 0.0336 0.0361
16:01-17:00, Wed., 12 Sep. 0.0398 0.0343 0.0363
15:01-16:00, Wed., 12 Sep. 0.0396 0.0334 0.0361
14:01-15:00, Wed., 12 Sep. 0.0415 0.0338 0.0359
13:01-14:00, Wed., 12 Sep. 0.0396 0.0339 0.0359
12:01-13:00, Wed., 12 Sep. 0.0386 0.0342 0.0363
11:01-12:00, Wed., 12 Sep. 0.0385 0.0344 0.0363
10:01-11:00, Wed., 12 Sep. 0.0383 0.0331 0.0360
09:01-10:00, Wed., 12 Sep. 0.0401 0.0338 0.0366
08:01-09:00, Wed., 12 Sep. 0.0390 0.0337 0.0361
07:01-08:00, Wed., 12 Sep. 0.0394 0.0338 0.0364
06:01-07:00, Wed., 12 Sep. 0.0400 0.0346 0.0364
05:01-06:00, Wed., 12 Sep. 0.0398 0.0344 0.0364
04:01-05:00, Wed., 12 Sep. 0.0393 0.0342 0.0362
03:01-04:00, Wed., 12 Sep. 0.0388 0.0333 0.0361
02:01-03:00, Wed., 12 Sep. 0.0387 0.0341 0.0361
01:01-02:00, Wed., 12 Sep. 0.0393 0.0339 0.0361
00:01-01:00, Wed., 12 Sep. 0.0388 0.0341 0.0364
23:01-24:00, Tue., 11 Sep. 0.0408 0.0338 0.0362
22:01-23:00, Tue., 11 Sep. 0.0397 0.0344 0.0362
21:01-22:00, Tue., 11 Sep. 0.0391 0.0340 0.0363
20:01-21:00, Tue., 11 Sep. 0.0390 0.0343 0.0363
19:01-20:00, Tue., 11 Sep. 0.0396 0.0340 0.0362
18:01-19:00, Tue., 11 Sep. 0.0381 0.0343 0.0361
17:01-18:00, Tue., 11 Sep. 0.0387 0.0342 0.0362
16:01-17:00, Tue., 11 Sep. 0.0381 0.0338 0.0358
15:01-16:00, Tue., 11 Sep. 0.0393 0.0342 0.0364
14:01-15:00, Tue., 11 Sep. 0.0389 0.0336 0.0361
13:01-14:00, Tue., 11 Sep. 0.0392 0.0338 0.0363
12:01-13:00, Tue., 11 Sep. 0.0397 0.0339 0.0364
11:01-12:00, Tue., 11 Sep. 0.0394 0.0333 0.0363
10:01-11:00, Tue., 11 Sep. 0.0389 0.0333 0.0365
09:01-10:00, Tue., 11 Sep. 0.0399 0.0347 0.0366
08:01-09:00, Tue., 11 Sep. 0.0402 0.0331 0.0364
07:01-08:00, Tue., 11 Sep. 0.0398 0.0346 0.0364
06:01-07:00, Tue., 11 Sep. 0.0402 0.0342 0.0364
05:01-06:00, Tue., 11 Sep. 0.0391 0.0335 0.0363
04:01-05:00, Tue., 11 Sep. 0.0399 0.0347 0.0367
03:01-04:00, Tue., 11 Sep. 0.0422 0.0358 0.0388
02:01-03:00, Tue., 11 Sep. 0.0481 0.0380 0.0435
01:01-02:00, Tue., 11 Sep. 0.0561 0.0451 0.0504
00:01-01:00, Tue., 11 Sep. 0.0481 0.0374 0.0419
23:01-24:00, Mon., 10 Sep. 0.0458 0.0385 0.0424
22:01-23:00, Mon., 10 Sep. 0.0443 0.0378 0.0414
21:01-22:00, Mon., 10 Sep. 0.0419 0.0362 0.0393