Radiation doses in the air / Measurement results by the hour (Ota)

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
21:01-22:00, Thu., 20 Sep. 0.0467 0.0398 0.0436
20:01-21:00, Thu., 20 Sep. 0.0456 0.0376 0.0408
19:01-20:00, Thu., 20 Sep. 0.0469 0.0384 0.0426
18:01-19:00, Thu., 20 Sep. 0.0538 0.0441 0.0487
17:01-18:00, Thu., 20 Sep. 0.0586 0.0490 0.0534
16:01-17:00, Thu., 20 Sep. 0.0524 0.0449 0.0483
15:01-16:00, Thu., 20 Sep. 0.0492 0.0423 0.0461
14:01-15:00, Thu., 20 Sep. 0.0467 0.0349 0.0411
13:01-14:00, Thu., 20 Sep. 0.0395 0.0336 0.0361
12:01-13:00, Thu., 20 Sep. 0.0389 0.0330 0.0349
11:01-12:00, Thu., 20 Sep. 0.0394 0.0325 0.0350
10:01-11:00, Thu., 20 Sep. 0.0371 0.0329 0.0352
09:01-10:00, Thu., 20 Sep. 0.0370 0.0325 0.0348
08:01-09:00, Thu., 20 Sep. 0.0373 0.0325 0.0348
07:01-08:00, Thu., 20 Sep. 0.0365 0.0328 0.0347
06:01-07:00, Thu., 20 Sep. 0.0369 0.0329 0.0348
05:01-06:00, Thu., 20 Sep. 0.0366 0.0326 0.0348
04:01-05:00, Thu., 20 Sep. 0.0369 0.0327 0.0346
03:01-04:00, Thu., 20 Sep. 0.0363 0.0329 0.0346
02:01-03:00, Thu., 20 Sep. 0.0368 0.0321 0.0345
01:01-02:00, Thu., 20 Sep. 0.0365 0.0316 0.0345
00:01-01:00, Thu., 20 Sep. 0.0365 0.0331 0.0347
23:01-24:00, Wed., 19 Sep. 0.0360 0.0324 0.0342
22:01-23:00, Wed., 19 Sep. 0.0369 0.0326 0.0344
21:01-22:00, Wed., 19 Sep. 0.0374 0.0317 0.0344
20:01-21:00, Wed., 19 Sep. 0.0380 0.0331 0.0348
19:01-20:00, Wed., 19 Sep. 0.0369 0.0328 0.0347
18:01-19:00, Wed., 19 Sep. 0.0359 0.0322 0.0345
17:01-18:00, Wed., 19 Sep. 0.0368 0.0329 0.0346
16:01-17:00, Wed., 19 Sep. 0.0370 0.0330 0.0349
15:01-16:00, Wed., 19 Sep. 0.0373 0.0329 0.0346
14:01-15:00, Wed., 19 Sep. 0.0367 0.0328 0.0346
13:01-14:00, Wed., 19 Sep. 0.0362 0.0316 0.0346
12:01-13:00, Wed., 19 Sep. 0.0367 0.0327 0.0345
11:01-12:00, Wed., 19 Sep. 0.0360 0.0320 0.0345
10:01-11:00, Wed., 19 Sep. 0.0367 0.0329 0.0344
09:01-10:00, Wed., 19 Sep. 0.0368 0.0328 0.0345
08:01-09:00, Wed., 19 Sep. 0.0363 0.0318 0.0345
07:01-08:00, Wed., 19 Sep. 0.0372 0.0326 0.0344
06:01-07:00, Wed., 19 Sep. 0.0365 0.0318 0.0342
05:01-06:00, Wed., 19 Sep. 0.0365 0.0319 0.0345
04:01-05:00, Wed., 19 Sep. 0.0367 0.0316 0.0345
03:01-04:00, Wed., 19 Sep. 0.0367 0.0331 0.0347
02:01-03:00, Wed., 19 Sep. 0.0367 0.0327 0.0344
01:01-02:00, Wed., 19 Sep. 0.0363 0.0319 0.0343
00:01-01:00, Wed., 19 Sep. 0.0369 0.0330 0.0352
23:01-24:00, Tue., 18 Sep. 0.0384 0.0327 0.0354
22:01-23:00, Tue., 18 Sep. 0.0433 0.0340 0.0386
21:01-22:00, Tue., 18 Sep. 0.0463 0.0358 0.0401
20:01-21:00, Tue., 18 Sep. 0.0566 0.0422 0.0496
19:01-20:00, Tue., 18 Sep. 0.0575 0.0363 0.0441
18:01-19:00, Tue., 18 Sep. 0.0406 0.0328 0.0369
17:01-18:00, Tue., 18 Sep. 0.0367 0.0324 0.0344
16:01-17:00, Tue., 18 Sep. 0.0363 0.0314 0.0337
15:01-16:00, Tue., 18 Sep. 0.0366 0.0325 0.0340
14:01-15:00, Tue., 18 Sep. 0.0366 0.0317 0.0340
13:01-14:00, Tue., 18 Sep. 0.0358 0.0317 0.0335
12:01-13:00, Tue., 18 Sep. 0.0357 0.0311 0.0338
11:01-12:00, Tue., 18 Sep. 0.0364 0.0316 0.0337
10:01-11:00, Tue., 18 Sep. 0.0358 0.0320 0.0339
09:01-10:00, Tue., 18 Sep. 0.0359 0.0319 0.0337
08:01-09:00, Tue., 18 Sep. 0.0360 0.0321 0.0340
07:01-08:00, Tue., 18 Sep. 0.0359 0.0317 0.0338
06:01-07:00, Tue., 18 Sep. 0.0363 0.0307 0.0338
05:01-06:00, Tue., 18 Sep. 0.0360 0.0325 0.0343
04:01-05:00, Tue., 18 Sep. 0.0402 0.0339 0.0363
03:01-04:00, Tue., 18 Sep. 0.0410 0.0334 0.0372
02:01-03:00, Tue., 18 Sep. 0.0368 0.0332 0.0345
01:01-02:00, Tue., 18 Sep. 0.0367 0.0320 0.0349
00:01-01:00, Tue., 18 Sep. 0.0414 0.0336 0.0363
23:01-24:00, Mon., 17 Sep. 0.0509 0.0364 0.0434
22:01-23:00, Mon., 17 Sep. 0.0711 0.0489 0.0592
21:01-22:00, Mon., 17 Sep. 0.0743 0.0610 0.0689
20:01-21:00, Mon., 17 Sep. 0.0717 0.0621 0.0676
19:01-20:00, Mon., 17 Sep. 0.0641 0.0437 0.0553
18:01-19:00, Mon., 17 Sep. 0.0439 0.0335 0.0360
17:01-18:00, Mon., 17 Sep. 0.0363 0.0333 0.0348
16:01-17:00, Mon., 17 Sep. 0.0366 0.0324 0.0347
15:01-16:00, Mon., 17 Sep. 0.0376 0.0328 0.0347
14:01-15:00, Mon., 17 Sep. 0.0367 0.0320 0.0348
13:01-14:00, Mon., 17 Sep. 0.0370 0.0328 0.0348
12:01-13:00, Mon., 17 Sep. 0.0373 0.0332 0.0351
11:01-12:00, Mon., 17 Sep. 0.0372 0.0321 0.0348
10:01-11:00, Mon., 17 Sep. 0.0366 0.0330 0.0346
09:01-10:00, Mon., 17 Sep. 0.0365 0.0315 0.0347
08:01-09:00, Mon., 17 Sep. 0.0385 0.0322 0.0344
07:01-08:00, Mon., 17 Sep. 0.0363 0.0326 0.0344
06:01-07:00, Mon., 17 Sep. 0.0360 0.0320 0.0344
05:01-06:00, Mon., 17 Sep. 0.0367 0.0318 0.0344
04:01-05:00, Mon., 17 Sep. 0.0369 0.0325 0.0346
03:01-04:00, Mon., 17 Sep. 0.0366 0.0322 0.0342
02:01-03:00, Mon., 17 Sep. 0.0366 0.0319 0.0343
01:01-02:00, Mon., 17 Sep. 0.0369 0.0321 0.0344
00:01-01:00, Mon., 17 Sep. 0.0365 0.0328 0.0345
23:01-24:00, Sun., 16 Sep. 0.0364 0.0328 0.0345
22:01-23:00, Sun., 16 Sep. 0.0362 0.0316 0.0344
21:01-22:00, Sun., 16 Sep. 0.0359 0.0324 0.0342
20:01-21:00, Sun., 16 Sep. 0.0363 0.0319 0.0343
19:01-20:00, Sun., 16 Sep. 0.0365 0.0322 0.0343
18:01-19:00, Sun., 16 Sep. 0.0360 0.0326 0.0344
17:01-18:00, Sun., 16 Sep. 0.0360 0.0323 0.0341
16:01-17:00, Sun., 16 Sep. 0.0364 0.0321 0.0343
15:01-16:00, Sun., 16 Sep. 0.0363 0.0321 0.0341
14:01-15:00, Sun., 16 Sep. 0.0373 0.0324 0.0342
13:01-14:00, Sun., 16 Sep. 0.0358 0.0323 0.0342
12:01-13:00, Sun., 16 Sep. 0.0363 0.0324 0.0344
11:01-12:00, Sun., 16 Sep. 0.0374 0.0322 0.0341
10:01-11:00, Sun., 16 Sep. 0.0362 0.0314 0.0343
09:01-10:00, Sun., 16 Sep. 0.0358 0.0317 0.0340
08:01-09:00, Sun., 16 Sep. 0.0362 0.0323 0.0339
07:01-08:00, Sun., 16 Sep. 0.0371 0.0319 0.0345
06:01-07:00, Sun., 16 Sep. 0.0360 0.0324 0.0341
05:01-06:00, Sun., 16 Sep. 0.0358 0.0324 0.0339
04:01-05:00, Sun., 16 Sep. 0.0365 0.0319 0.0343
03:01-04:00, Sun., 16 Sep. 0.0367 0.0316 0.0340
02:01-03:00, Sun., 16 Sep. 0.0360 0.0317 0.0340
01:01-02:00, Sun., 16 Sep. 0.0358 0.0319 0.0339
00:01-01:00, Sun., 16 Sep. 0.0357 0.0317 0.0337
23:01-24:00, Sat., 15 Sep. 0.0360 0.0312 0.0336
22:01-23:00, Sat., 15 Sep. 0.0357 0.0320 0.0340
21:01-22:00, Sat., 15 Sep. 0.0361 0.0315 0.0339
20:01-21:00, Sat., 15 Sep. 0.0368 0.0320 0.0338
19:01-20:00, Sat., 15 Sep. 0.0362 0.0312 0.0340
18:01-19:00, Sat., 15 Sep. 0.0363 0.0318 0.0337
17:01-18:00, Sat., 15 Sep. 0.0355 0.0321 0.0340
16:01-17:00, Sat., 15 Sep. 0.0362 0.0324 0.0341
15:01-16:00, Sat., 15 Sep. 0.0369 0.0331 0.0352
14:01-15:00, Sat., 15 Sep. 0.0398 0.0339 0.0363
13:01-14:00, Sat., 15 Sep. 0.0403 0.0351 0.0374
12:01-13:00, Sat., 15 Sep. 0.0384 0.0348 0.0366
11:01-12:00, Sat., 15 Sep. 0.0405 0.0347 0.0369
10:01-11:00, Sat., 15 Sep. 0.0411 0.0339 0.0367
09:01-10:00, Sat., 15 Sep. 0.0409 0.0358 0.0382
08:01-09:00, Sat., 15 Sep. 0.0432 0.0361 0.0392
07:01-08:00, Sat., 15 Sep. 0.0376 0.0325 0.0347
06:01-07:00, Sat., 15 Sep. 0.0365 0.0311 0.0336
05:01-06:00, Sat., 15 Sep. 0.0362 0.0310 0.0340
04:01-05:00, Sat., 15 Sep. 0.0371 0.0323 0.0341
03:01-04:00, Sat., 15 Sep. 0.0375 0.0321 0.0354
02:01-03:00, Sat., 15 Sep. 0.0401 0.0349 0.0367
01:01-02:00, Sat., 15 Sep. 0.0400 0.0337 0.0362
00:01-01:00, Sat., 15 Sep. 0.0400 0.0337 0.0362
23:01-24:00, Fri., 14 Sep. 0.0393 0.0332 0.0358
22:01-23:00, Fri., 14 Sep. 0.0403 0.0346 0.0364
21:01-22:00, Fri., 14 Sep. 0.0393 0.0346 0.0363
20:01-21:00, Fri., 14 Sep. 0.0372 0.0325 0.0347
19:01-20:00, Fri., 14 Sep. 0.0364 0.0317 0.0343
18:01-19:00, Fri., 14 Sep. 0.0364 0.0322 0.0342
17:01-18:00, Fri., 14 Sep. 0.0367 0.0317 0.0340
16:01-17:00, Fri., 14 Sep. 0.0367 0.0320 0.0341
15:01-16:00, Fri., 14 Sep. 0.0373 0.0322 0.0345
14:01-15:00, Fri., 14 Sep. 0.0371 0.0330 0.0353
13:01-14:00, Fri., 14 Sep. 0.0374 0.0313 0.0346
12:01-13:00, Fri., 14 Sep. 0.0369 0.0321 0.0340
11:01-12:00, Fri., 14 Sep. 0.0372 0.0326 0.0348
10:01-11:00, Fri., 14 Sep. 0.0369 0.0339 0.0354
09:01-10:00, Fri., 14 Sep. 0.0388 0.0335 0.0356
08:01-09:00, Fri., 14 Sep. 0.0397 0.0343 0.0363
07:01-08:00, Fri., 14 Sep. 0.0389 0.0333 0.0358
06:01-07:00, Fri., 14 Sep. 0.0380 0.0341 0.0358
05:01-06:00, Fri., 14 Sep. 0.0393 0.0340 0.0358
04:01-05:00, Fri., 14 Sep. 0.0364 0.0333 0.0350
03:01-04:00, Fri., 14 Sep. 0.0384 0.0328 0.0354
02:01-03:00, Fri., 14 Sep. 0.0372 0.0325 0.0350
01:01-02:00, Fri., 14 Sep. 0.0375 0.0334 0.0354
00:01-01:00, Fri., 14 Sep. 0.0373 0.0329 0.0354
23:01-24:00, Thu., 13 Sep. 0.0379 0.0339 0.0361
22:01-23:00, Thu., 13 Sep. 0.0377 0.0336 0.0356
21:01-22:00, Thu., 13 Sep. 0.0400 0.0333 0.0355
20:01-21:00, Thu., 13 Sep. 0.0373 0.0327 0.0353
19:01-20:00, Thu., 13 Sep. 0.0363 0.0332 0.0347
18:01-19:00, Thu., 13 Sep. 0.0366 0.0326 0.0344
17:01-18:00, Thu., 13 Sep. 0.0363 0.0325 0.0344
16:01-17:00, Thu., 13 Sep. 0.0367 0.0322 0.0343
15:01-16:00, Thu., 13 Sep. 0.0363 0.0327 0.0346
14:01-15:00, Thu., 13 Sep. 0.0363 0.0313 0.0345
13:01-14:00, Thu., 13 Sep. 0.0367 0.0325 0.0346
12:01-13:00, Thu., 13 Sep. 0.0363 0.0319 0.0343
11:01-12:00, Thu., 13 Sep. 0.0363 0.0330 0.0347
10:01-11:00, Thu., 13 Sep. 0.0366 0.0323 0.0345
09:01-10:00, Thu., 13 Sep. 0.0363 0.0320 0.0341
08:01-09:00, Thu., 13 Sep. 0.0369 0.0317 0.0342
07:01-08:00, Thu., 13 Sep. 0.0359 0.0331 0.0346
06:01-07:00, Thu., 13 Sep. 0.0363 0.0321 0.0344
05:01-06:00, Thu., 13 Sep. 0.0366 0.0324 0.0343
04:01-05:00, Thu., 13 Sep. 0.0359 0.0323 0.0344
03:01-04:00, Thu., 13 Sep. 0.0359 0.0324 0.0346
02:01-03:00, Thu., 13 Sep. 0.0369 0.0319 0.0343
01:01-02:00, Thu., 13 Sep. 0.0368 0.0327 0.0345
00:01-01:00, Thu., 13 Sep. 0.0365 0.0323 0.0348
23:01-24:00, Wed., 12 Sep. 0.0373 0.0336 0.0355
22:01-23:00, Wed., 12 Sep. 0.0380 0.0331 0.0353
21:01-22:00, Wed., 12 Sep. 0.0383 0.0341 0.0360
20:01-21:00, Wed., 12 Sep. 0.0368 0.0323 0.0350
19:01-20:00, Wed., 12 Sep. 0.0371 0.0332 0.0349
18:01-19:00, Wed., 12 Sep. 0.0363 0.0321 0.0343
17:01-18:00, Wed., 12 Sep. 0.0363 0.0320 0.0343
16:01-17:00, Wed., 12 Sep. 0.0363 0.0323 0.0341
15:01-16:00, Wed., 12 Sep. 0.0386 0.0318 0.0343
14:01-15:00, Wed., 12 Sep. 0.0370 0.0326 0.0343
13:01-14:00, Wed., 12 Sep. 0.0365 0.0320 0.0343
12:01-13:00, Wed., 12 Sep. 0.0369 0.0324 0.0342
11:01-12:00, Wed., 12 Sep. 0.0365 0.0324 0.0342
10:01-11:00, Wed., 12 Sep. 0.0361 0.0311 0.0342
09:01-10:00, Wed., 12 Sep. 0.0365 0.0313 0.0339
08:01-09:00, Wed., 12 Sep. 0.0359 0.0314 0.0341
07:01-08:00, Wed., 12 Sep. 0.0364 0.0324 0.0341
06:01-07:00, Wed., 12 Sep. 0.0365 0.0322 0.0342
05:01-06:00, Wed., 12 Sep. 0.0367 0.0313 0.0340
04:01-05:00, Wed., 12 Sep. 0.0364 0.0325 0.0345
03:01-04:00, Wed., 12 Sep. 0.0361 0.0323 0.0342
02:01-03:00, Wed., 12 Sep. 0.0358 0.0319 0.0343
01:01-02:00, Wed., 12 Sep. 0.0361 0.0319 0.0341
00:01-01:00, Wed., 12 Sep. 0.0364 0.0323 0.0342
23:01-24:00, Tue., 11 Sep. 0.0360 0.0322 0.0342
22:01-23:00, Tue., 11 Sep. 0.0359 0.0320 0.0339
21:01-22:00, Tue., 11 Sep. 0.0359 0.0320 0.0342
20:01-21:00, Tue., 11 Sep. 0.0358 0.0319 0.0342
19:01-20:00, Tue., 11 Sep. 0.0364 0.0322 0.0341
18:01-19:00, Tue., 11 Sep. 0.0364 0.0327 0.0342
17:01-18:00, Tue., 11 Sep. 0.0361 0.0323 0.0343
16:01-17:00, Tue., 11 Sep. 0.0360 0.0326 0.0342
15:01-16:00, Tue., 11 Sep. 0.0364 0.0325 0.0341
14:01-15:00, Tue., 11 Sep. 0.0368 0.0319 0.0343
13:01-14:00, Tue., 11 Sep. 0.0367 0.0316 0.0342
12:01-13:00, Tue., 11 Sep. 0.0365 0.0320 0.0340
11:01-12:00, Tue., 11 Sep. 0.0364 0.0324 0.0341
10:01-11:00, Tue., 11 Sep. 0.0360 0.0322 0.0340
09:01-10:00, Tue., 11 Sep. 0.0364 0.0315 0.0340
08:01-09:00, Tue., 11 Sep. 0.0361 0.0315 0.0339
07:01-08:00, Tue., 11 Sep. 0.0357 0.0312 0.0338
06:01-07:00, Tue., 11 Sep. 0.0357 0.0313 0.0339
05:01-06:00, Tue., 11 Sep. 0.0361 0.0320 0.0341
04:01-05:00, Tue., 11 Sep. 0.0363 0.0323 0.0344
03:01-04:00, Tue., 11 Sep. 0.0370 0.0327 0.0349
02:01-03:00, Tue., 11 Sep. 0.0383 0.0340 0.0362
01:01-02:00, Tue., 11 Sep. 0.0408 0.0352 0.0372
00:01-01:00, Tue., 11 Sep. 0.0393 0.0350 0.0367
23:01-24:00, Mon., 10 Sep. 0.0403 0.0348 0.0369
22:01-23:00, Mon., 10 Sep. 0.0407 0.0344 0.0366