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
19:01-20:00, Sun., 24 Jun. 0.0411 0.0344 0.0376
18:01-19:00, Sun., 24 Jun. 0.0424 0.0348 0.0374
17:01-18:00, Sun., 24 Jun. 0.0430 0.0351 0.0375
16:01-17:00, Sun., 24 Jun. 0.0406 0.0352 0.0370
15:01-16:00, Sun., 24 Jun. 0.0421 0.0344 0.0374
14:01-15:00, Sun., 24 Jun. 0.0416 0.0354 0.0372
13:01-14:00, Sun., 24 Jun. 0.0412 0.0358 0.0377
12:01-13:00, Sun., 24 Jun. 0.0427 0.0356 0.0382
11:01-12:00, Sun., 24 Jun. 0.0438 0.0368 0.0394
10:01-11:00, Sun., 24 Jun. 0.0470 0.0385 0.0430
09:01-10:00, Sun., 24 Jun. 0.0489 0.0364 0.0404
08:01-09:00, Sun., 24 Jun. 0.0437 0.0366 0.0395
07:01-08:00, Sun., 24 Jun. 0.0440 0.0368 0.0406
06:01-07:00, Sun., 24 Jun. 0.0451 0.0396 0.0427
05:01-06:00, Sun., 24 Jun. 0.0445 0.0352 0.0394
04:01-05:00, Sun., 24 Jun. 0.0429 0.0362 0.0389
03:01-04:00, Sun., 24 Jun. 0.0409 0.0353 0.0373
02:01-03:00, Sun., 24 Jun. 0.0396 0.0349 0.0370
01:01-02:00, Sun., 24 Jun. 0.0413 0.0354 0.0375
00:01-01:00, Sun., 24 Jun. 0.0413 0.0348 0.0373
23:01-24:00, Sat., 23 Jun. 0.0400 0.0352 0.0373
22:01-23:00, Sat., 23 Jun. 0.0409 0.0351 0.0374
21:01-22:00, Sat., 23 Jun. 0.0410 0.0353 0.0377
20:01-21:00, Sat., 23 Jun. 0.0438 0.0361 0.0393
19:01-20:00, Sat., 23 Jun. 0.0494 0.0385 0.0440
18:01-19:00, Sat., 23 Jun. 0.0567 0.0446 0.0500
17:01-18:00, Sat., 23 Jun. 0.0565 0.0476 0.0513
16:01-17:00, Sat., 23 Jun. 0.0531 0.0428 0.0477
15:01-16:00, Sat., 23 Jun. 0.0479 0.0392 0.0438
14:01-15:00, Sat., 23 Jun. 0.0447 0.0371 0.0405
13:01-14:00, Sat., 23 Jun. 0.0447 0.0364 0.0405
12:01-13:00, Sat., 23 Jun. 0.0426 0.0366 0.0399
11:01-12:00, Sat., 23 Jun. 0.0411 0.0359 0.0381
10:01-11:00, Sat., 23 Jun. 0.0415 0.0354 0.0382
09:01-10:00, Sat., 23 Jun. 0.0407 0.0356 0.0380
08:01-09:00, Sat., 23 Jun. 0.0420 0.0361 0.0381
07:01-08:00, Sat., 23 Jun. 0.0413 0.0352 0.0381
06:01-07:00, Sat., 23 Jun. 0.0414 0.0356 0.0381
05:01-06:00, Sat., 23 Jun. 0.0415 0.0359 0.0379
04:01-05:00, Sat., 23 Jun. 0.0419 0.0348 0.0380
03:01-04:00, Sat., 23 Jun. 0.0401 0.0359 0.0377
02:01-03:00, Sat., 23 Jun. 0.0413 0.0354 0.0383
01:01-02:00, Sat., 23 Jun. 0.0413 0.0357 0.0379
00:01-01:00, Sat., 23 Jun. 0.0405 0.0349 0.0374
23:01-24:00, Fri., 22 Jun. 0.0411 0.0359 0.0379
22:01-23:00, Fri., 22 Jun. 0.0409 0.0350 0.0376
21:01-22:00, Fri., 22 Jun. 0.0418 0.0357 0.0378
20:01-21:00, Fri., 22 Jun. 0.0405 0.0353 0.0373
19:01-20:00, Fri., 22 Jun. 0.0406 0.0355 0.0374
18:01-19:00, Fri., 22 Jun. 0.0411 0.0357 0.0374
17:01-18:00, Fri., 22 Jun. 0.0399 0.0357 0.0375
16:01-17:00, Fri., 22 Jun. 0.0406 0.0356 0.0374
15:01-16:00, Fri., 22 Jun. 0.0420 0.0353 0.0377
14:01-15:00, Fri., 22 Jun. 0.0403 0.0341 0.0371
13:01-14:00, Fri., 22 Jun. 0.0402 0.0355 0.0372
12:01-13:00, Fri., 22 Jun. 0.0415 0.0353 0.0374
11:01-12:00, Fri., 22 Jun. 0.0412 0.0339 0.0376
10:01-11:00, Fri., 22 Jun. 0.0404 0.0357 0.0375
09:01-10:00, Fri., 22 Jun. 0.0419 0.0360 0.0379
08:01-09:00, Fri., 22 Jun. 0.0430 0.0352 0.0380
07:01-08:00, Fri., 22 Jun. 0.0420 0.0358 0.0383
06:01-07:00, Fri., 22 Jun. 0.0414 0.0357 0.0382
05:01-06:00, Fri., 22 Jun. 0.0414 0.0353 0.0382
04:01-05:00, Fri., 22 Jun. 0.0412 0.0353 0.0378
03:01-04:00, Fri., 22 Jun. 0.0414 0.0353 0.0377
02:01-03:00, Fri., 22 Jun. 0.0415 0.0349 0.0374
01:01-02:00, Fri., 22 Jun. 0.0407 0.0352 0.0374
00:01-01:00, Fri., 22 Jun. 0.0420 0.0359 0.0382
23:01-24:00, Thu., 21 Jun. 0.0409 0.0357 0.0375
22:01-23:00, Thu., 21 Jun. 0.0409 0.0346 0.0376
21:01-22:00, Thu., 21 Jun. 0.0410 0.0352 0.0373
20:01-21:00, Thu., 21 Jun. 0.0416 0.0355 0.0376
19:01-20:00, Thu., 21 Jun. 0.0406 0.0351 0.0374
18:01-19:00, Thu., 21 Jun. 0.0408 0.0347 0.0375
17:01-18:00, Thu., 21 Jun. 0.0408 0.0356 0.0372
16:01-17:00, Thu., 21 Jun. 0.0407 0.0356 0.0372
15:01-16:00, Thu., 21 Jun. 0.0395 0.0347 0.0369
14:01-15:00, Thu., 21 Jun. 0.0404 0.0351 0.0369
13:01-14:00, Thu., 21 Jun. 0.0419 0.0330 0.0372
12:01-13:00, Thu., 21 Jun. 0.0400 0.0344 0.0370
11:01-12:00, Thu., 21 Jun. 0.0399 0.0346 0.0369
10:01-11:00, Thu., 21 Jun. 0.0406 0.0354 0.0372
09:01-10:00, Thu., 21 Jun. 0.0413 0.0348 0.0376
08:01-09:00, Thu., 21 Jun. 0.0415 0.0350 0.0372
07:01-08:00, Thu., 21 Jun. 0.0403 0.0350 0.0373
06:01-07:00, Thu., 21 Jun. 0.0405 0.0351 0.0376
05:01-06:00, Thu., 21 Jun. 0.0426 0.0363 0.0394
04:01-05:00, Thu., 21 Jun. 0.0459 0.0362 0.0415
03:01-04:00, Thu., 21 Jun. 0.0437 0.0368 0.0403
02:01-03:00, Thu., 21 Jun. 0.0424 0.0353 0.0384
01:01-02:00, Thu., 21 Jun. 0.0411 0.0357 0.0376
00:01-01:00, Thu., 21 Jun. 0.0445 0.0356 0.0403
23:01-24:00, Wed., 20 Jun. 0.0496 0.0400 0.0450
22:01-23:00, Wed., 20 Jun. 0.0497 0.0415 0.0465
21:01-22:00, Wed., 20 Jun. 0.0485 0.0393 0.0444
20:01-21:00, Wed., 20 Jun. 0.0458 0.0389 0.0420
19:01-20:00, Wed., 20 Jun. 0.0439 0.0357 0.0388
18:01-19:00, Wed., 20 Jun. 0.0412 0.0355 0.0374
17:01-18:00, Wed., 20 Jun. 0.0406 0.0357 0.0378
16:01-17:00, Wed., 20 Jun. 0.0408 0.0349 0.0373
15:01-16:00, Wed., 20 Jun. 0.0401 0.0347 0.0372
14:01-15:00, Wed., 20 Jun. 0.0401 0.0357 0.0372
13:01-14:00, Wed., 20 Jun. 0.0409 0.0359 0.0379
12:01-13:00, Wed., 20 Jun. 0.0449 0.0372 0.0405
11:01-12:00, Wed., 20 Jun. 0.0473 0.0391 0.0429
10:01-11:00, Wed., 20 Jun. 0.0467 0.0373 0.0421
09:01-10:00, Wed., 20 Jun. 0.0453 0.0390 0.0422
08:01-09:00, Wed., 20 Jun. 0.0456 0.0392 0.0425
07:01-08:00, Wed., 20 Jun. 0.0451 0.0376 0.0423
06:01-07:00, Wed., 20 Jun. 0.0427 0.0363 0.0393
05:01-06:00, Wed., 20 Jun. 0.0452 0.0373 0.0403
04:01-05:00, Wed., 20 Jun. 0.0435 0.0365 0.0399
03:01-04:00, Wed., 20 Jun. 0.0427 0.0359 0.0387
02:01-03:00, Wed., 20 Jun. 0.0410 0.0353 0.0376
01:01-02:00, Wed., 20 Jun. 0.0399 0.0348 0.0372
00:01-01:00, Wed., 20 Jun. 0.0408 0.0350 0.0371
23:01-24:00, Tue., 19 Jun. 0.0401 0.0355 0.0371
22:01-23:00, Tue., 19 Jun. 0.0415 0.0355 0.0372
21:01-22:00, Tue., 19 Jun. 0.0407 0.0353 0.0371
20:01-21:00, Tue., 19 Jun. 0.0416 0.0345 0.0368
19:01-20:00, Tue., 19 Jun. 0.0392 0.0352 0.0367
18:01-19:00, Tue., 19 Jun. 0.0404 0.0343 0.0368
17:01-18:00, Tue., 19 Jun. 0.0405 0.0343 0.0367
16:01-17:00, Tue., 19 Jun. 0.0404 0.0351 0.0369
15:01-16:00, Tue., 19 Jun. 0.0412 0.0352 0.0369
14:01-15:00, Tue., 19 Jun. 0.0398 0.0349 0.0368
13:01-14:00, Tue., 19 Jun. 0.0409 0.0345 0.0368
12:01-13:00, Tue., 19 Jun. 0.0401 0.0350 0.0369
11:01-12:00, Tue., 19 Jun. 0.0396 0.0340 0.0367
10:01-11:00, Tue., 19 Jun. 0.0405 0.0345 0.0368
09:01-10:00, Tue., 19 Jun. 0.0410 0.0354 0.0374
08:01-09:00, Tue., 19 Jun. 0.0406 0.0354 0.0374
07:01-08:00, Tue., 19 Jun. 0.0405 0.0352 0.0373
06:01-07:00, Tue., 19 Jun. 0.0399 0.0354 0.0371
05:01-06:00, Tue., 19 Jun. 0.0415 0.0348 0.0376
04:01-05:00, Tue., 19 Jun. 0.0424 0.0353 0.0374
03:01-04:00, Tue., 19 Jun. 0.0404 0.0349 0.0373
02:01-03:00, Tue., 19 Jun. 0.0412 0.0355 0.0377
01:01-02:00, Tue., 19 Jun. 0.0410 0.0348 0.0376
00:01-01:00, Tue., 19 Jun. 0.0424 0.0350 0.0375
23:01-24:00, Mon., 18 Jun. 0.0408 0.0354 0.0376
22:01-23:00, Mon., 18 Jun. 0.0423 0.0359 0.0380
21:01-22:00, Mon., 18 Jun. 0.0397 0.0355 0.0372
20:01-21:00, Mon., 18 Jun. 0.0414 0.0350 0.0375
19:01-20:00, Mon., 18 Jun. 0.0437 0.0351 0.0393
18:01-19:00, Mon., 18 Jun. 0.0463 0.0374 0.0421
17:01-18:00, Mon., 18 Jun. 0.0418 0.0353 0.0375
16:01-17:00, Mon., 18 Jun. 0.0418 0.0349 0.0378
15:01-16:00, Mon., 18 Jun. 0.0419 0.0357 0.0384
14:01-15:00, Mon., 18 Jun. 0.0419 0.0349 0.0375
13:01-14:00, Mon., 18 Jun. 0.0427 0.0354 0.0377
12:01-13:00, Mon., 18 Jun. 0.0410 0.0356 0.0376
11:01-12:00, Mon., 18 Jun. 0.0426 0.0356 0.0385
10:01-11:00, Mon., 18 Jun. 0.0405 0.0341 0.0377
09:01-10:00, Mon., 18 Jun. 0.0402 0.0350 0.0371
08:01-09:00, Mon., 18 Jun. 0.0416 0.0353 0.0376
07:01-08:00, Mon., 18 Jun. 0.0416 0.0355 0.0379
06:01-07:00, Mon., 18 Jun. 0.0402 0.0355 0.0374
05:01-06:00, Mon., 18 Jun. 0.0408 0.0350 0.0374
04:01-05:00, Mon., 18 Jun. 0.0418 0.0354 0.0372
03:01-04:00, Mon., 18 Jun. 0.0406 0.0351 0.0373
02:01-03:00, Mon., 18 Jun. 0.0402 0.0351 0.0371
01:01-02:00, Mon., 18 Jun. 0.0409 0.0339 0.0369
00:01-01:00, Mon., 18 Jun. 0.0391 0.0350 0.0369
23:01-24:00, Sun., 17 Jun. 0.0400 0.0347 0.0368
22:01-23:00, Sun., 17 Jun. 0.0398 0.0351 0.0370
21:01-22:00, Sun., 17 Jun. 0.0403 0.0344 0.0368
20:01-21:00, Sun., 17 Jun. 0.0420 0.0347 0.0374
19:01-20:00, Sun., 17 Jun. 0.0398 0.0351 0.0373
18:01-19:00, Sun., 17 Jun. 0.0399 0.0355 0.0371
17:01-18:00, Sun., 17 Jun. 0.0393 0.0350 0.0369
16:01-17:00, Sun., 17 Jun. 0.0394 0.0349 0.0367
15:01-16:00, Sun., 17 Jun. 0.0394 0.0348 0.0367
14:01-15:00, Sun., 17 Jun. 0.0394 0.0339 0.0368
13:01-14:00, Sun., 17 Jun. 0.0407 0.0348 0.0369
12:01-13:00, Sun., 17 Jun. 0.0415 0.0348 0.0371
11:01-12:00, Sun., 17 Jun. 0.0399 0.0354 0.0369
10:01-11:00, Sun., 17 Jun. 0.0414 0.0346 0.0370
09:01-10:00, Sun., 17 Jun. 0.0416 0.0343 0.0367
08:01-09:00, Sun., 17 Jun. 0.0417 0.0348 0.0370
07:01-08:00, Sun., 17 Jun. 0.0405 0.0352 0.0368
06:01-07:00, Sun., 17 Jun. 0.0400 0.0347 0.0364
05:01-06:00, Sun., 17 Jun. 0.0410 0.0351 0.0373
04:01-05:00, Sun., 17 Jun. 0.0396 0.0347 0.0365
03:01-04:00, Sun., 17 Jun. 0.0402 0.0351 0.0367
02:01-03:00, Sun., 17 Jun. 0.0397 0.0332 0.0366
01:01-02:00, Sun., 17 Jun. 0.0397 0.0345 0.0364
00:01-01:00, Sun., 17 Jun. 0.0398 0.0345 0.0364
23:01-24:00, Sat., 16 Jun. 0.0399 0.0335 0.0368
22:01-23:00, Sat., 16 Jun. 0.0397 0.0345 0.0365
21:01-22:00, Sat., 16 Jun. 0.0409 0.0339 0.0366
20:01-21:00, Sat., 16 Jun. 0.0389 0.0350 0.0366
19:01-20:00, Sat., 16 Jun. 0.0387 0.0347 0.0366
18:01-19:00, Sat., 16 Jun. 0.0402 0.0351 0.0370
17:01-18:00, Sat., 16 Jun. 0.0401 0.0343 0.0367
16:01-17:00, Sat., 16 Jun. 0.0413 0.0349 0.0370
15:01-16:00, Sat., 16 Jun. 0.0385 0.0344 0.0364
14:01-15:00, Sat., 16 Jun. 0.0392 0.0331 0.0365
13:01-14:00, Sat., 16 Jun. 0.0396 0.0348 0.0367
12:01-13:00, Sat., 16 Jun. 0.0401 0.0351 0.0366
11:01-12:00, Sat., 16 Jun. 0.0405 0.0342 0.0366
10:01-11:00, Sat., 16 Jun. 0.0397 0.0348 0.0367
09:01-10:00, Sat., 16 Jun. 0.0395 0.0340 0.0366
08:01-09:00, Sat., 16 Jun. 0.0401 0.0347 0.0367
07:01-08:00, Sat., 16 Jun. 0.0397 0.0348 0.0369
06:01-07:00, Sat., 16 Jun. 0.0409 0.0352 0.0373
05:01-06:00, Sat., 16 Jun. 0.0433 0.0358 0.0381
04:01-05:00, Sat., 16 Jun. 0.0428 0.0367 0.0395
03:01-04:00, Sat., 16 Jun. 0.0436 0.0361 0.0396
02:01-03:00, Sat., 16 Jun. 0.0402 0.0344 0.0370
01:01-02:00, Sat., 16 Jun. 0.0404 0.0345 0.0371
00:01-01:00, Sat., 16 Jun. 0.0413 0.0353 0.0376
23:01-24:00, Fri., 15 Jun. 0.0406 0.0352 0.0374
22:01-23:00, Fri., 15 Jun. 0.0404 0.0342 0.0368
21:01-22:00, Fri., 15 Jun. 0.0416 0.0351 0.0376
20:01-21:00, Fri., 15 Jun. 0.0402 0.0350 0.0368
19:01-20:00, Fri., 15 Jun. 0.0393 0.0347 0.0367
18:01-19:00, Fri., 15 Jun. 0.0396 0.0353 0.0372
17:01-18:00, Fri., 15 Jun. 0.0405 0.0351 0.0373
16:01-17:00, Fri., 15 Jun. 0.0420 0.0352 0.0383
15:01-16:00, Fri., 15 Jun. 0.0460 0.0370 0.0408
14:01-15:00, Fri., 15 Jun. 0.0459 0.0378 0.0416
13:01-14:00, Fri., 15 Jun. 0.0457 0.0376 0.0420
12:01-13:00, Fri., 15 Jun. 0.0444 0.0360 0.0401
11:01-12:00, Fri., 15 Jun. 0.0457 0.0367 0.0424
10:01-11:00, Fri., 15 Jun. 0.0452 0.0346 0.0398
09:01-10:00, Fri., 15 Jun. 0.0399 0.0338 0.0368
08:01-09:00, Fri., 15 Jun. 0.0402 0.0344 0.0372
07:01-08:00, Fri., 15 Jun. 0.0400 0.0343 0.0370
06:01-07:00, Fri., 15 Jun. 0.0406 0.0353 0.0375
05:01-06:00, Fri., 15 Jun. 0.0413 0.0350 0.0372
04:01-05:00, Fri., 15 Jun. 0.0396 0.0342 0.0369
03:01-04:00, Fri., 15 Jun. 0.0407 0.0350 0.0370
02:01-03:00, Fri., 15 Jun. 0.0395 0.0348 0.0369
01:01-02:00, Fri., 15 Jun. 0.0406 0.0346 0.0370
00:01-01:00, Fri., 15 Jun. 0.0419 0.0354 0.0372
23:01-24:00, Thu., 14 Jun. 0.0399 0.0343 0.0371
22:01-23:00, Thu., 14 Jun. 0.0399 0.0350 0.0370
21:01-22:00, Thu., 14 Jun. 0.0396 0.0342 0.0370
20:01-21:00, Thu., 14 Jun. 0.0406 0.0344 0.0370