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
19:01-20:00, Sun., 24 Jun. 0.0367 0.0334 0.0350
18:01-19:00, Sun., 24 Jun. 0.0380 0.0325 0.0353
17:01-18:00, Sun., 24 Jun. 0.0371 0.0338 0.0353
16:01-17:00, Sun., 24 Jun. 0.0386 0.0324 0.0348
15:01-16:00, Sun., 24 Jun. 0.0371 0.0327 0.0350
14:01-15:00, Sun., 24 Jun. 0.0375 0.0328 0.0352
13:01-14:00, Sun., 24 Jun. 0.0375 0.0332 0.0352
12:01-13:00, Sun., 24 Jun. 0.0389 0.0342 0.0362
11:01-12:00, Sun., 24 Jun. 0.0421 0.0356 0.0383
10:01-11:00, Sun., 24 Jun. 0.0424 0.0352 0.0377
09:01-10:00, Sun., 24 Jun. 0.0413 0.0359 0.0382
08:01-09:00, Sun., 24 Jun. 0.0408 0.0352 0.0376
07:01-08:00, Sun., 24 Jun. 0.0444 0.0364 0.0400
06:01-07:00, Sun., 24 Jun. 0.0471 0.0386 0.0434
05:01-06:00, Sun., 24 Jun. 0.0442 0.0352 0.0391
04:01-05:00, Sun., 24 Jun. 0.0415 0.0337 0.0363
03:01-04:00, Sun., 24 Jun. 0.0413 0.0332 0.0358
02:01-03:00, Sun., 24 Jun. 0.0363 0.0323 0.0345
01:01-02:00, Sun., 24 Jun. 0.0369 0.0320 0.0348
00:01-01:00, Sun., 24 Jun. 0.0367 0.0313 0.0343
23:01-24:00, Sat., 23 Jun. 0.0367 0.0331 0.0350
22:01-23:00, Sat., 23 Jun. 0.0369 0.0330 0.0350
21:01-22:00, Sat., 23 Jun. 0.0379 0.0320 0.0356
20:01-21:00, Sat., 23 Jun. 0.0420 0.0349 0.0377
19:01-20:00, Sat., 23 Jun. 0.0434 0.0365 0.0404
18:01-19:00, Sat., 23 Jun. 0.0503 0.0384 0.0437
17:01-18:00, Sat., 23 Jun. 0.0513 0.0434 0.0468
16:01-17:00, Sat., 23 Jun. 0.0485 0.0396 0.0444
15:01-16:00, Sat., 23 Jun. 0.0475 0.0400 0.0433
14:01-15:00, Sat., 23 Jun. 0.0456 0.0366 0.0412
13:01-14:00, Sat., 23 Jun. 0.0428 0.0359 0.0386
12:01-13:00, Sat., 23 Jun. 0.0411 0.0337 0.0365
11:01-12:00, Sat., 23 Jun. 0.0370 0.0339 0.0356
10:01-11:00, Sat., 23 Jun. 0.0388 0.0335 0.0355
09:01-10:00, Sat., 23 Jun. 0.0371 0.0332 0.0355
08:01-09:00, Sat., 23 Jun. 0.0372 0.0335 0.0355
07:01-08:00, Sat., 23 Jun. 0.0376 0.0339 0.0355
06:01-07:00, Sat., 23 Jun. 0.0381 0.0321 0.0352
05:01-06:00, Sat., 23 Jun. 0.0381 0.0338 0.0355
04:01-05:00, Sat., 23 Jun. 0.0379 0.0330 0.0353
03:01-04:00, Sat., 23 Jun. 0.0370 0.0322 0.0350
02:01-03:00, Sat., 23 Jun. 0.0370 0.0333 0.0355
01:01-02:00, Sat., 23 Jun. 0.0375 0.0336 0.0355
00:01-01:00, Sat., 23 Jun. 0.0369 0.0333 0.0351
23:01-24:00, Fri., 22 Jun. 0.0372 0.0336 0.0353
22:01-23:00, Fri., 22 Jun. 0.0383 0.0337 0.0356
21:01-22:00, Fri., 22 Jun. 0.0382 0.0329 0.0354
20:01-21:00, Fri., 22 Jun. 0.0383 0.0328 0.0354
19:01-20:00, Fri., 22 Jun. 0.0370 0.0328 0.0351
18:01-19:00, Fri., 22 Jun. 0.0373 0.0331 0.0352
17:01-18:00, Fri., 22 Jun. 0.0391 0.0336 0.0352
16:01-17:00, Fri., 22 Jun. 0.0369 0.0327 0.0353
15:01-16:00, Fri., 22 Jun. 0.0376 0.0331 0.0352
14:01-15:00, Fri., 22 Jun. 0.0370 0.0330 0.0350
13:01-14:00, Fri., 22 Jun. 0.0371 0.0320 0.0349
12:01-13:00, Fri., 22 Jun. 0.0371 0.0328 0.0351
11:01-12:00, Fri., 22 Jun. 0.0378 0.0323 0.0351
10:01-11:00, Fri., 22 Jun. 0.0376 0.0328 0.0350
09:01-10:00, Fri., 22 Jun. 0.0369 0.0325 0.0348
08:01-09:00, Fri., 22 Jun. 0.0369 0.0336 0.0352
07:01-08:00, Fri., 22 Jun. 0.0373 0.0332 0.0353
06:01-07:00, Fri., 22 Jun. 0.0373 0.0334 0.0353
05:01-06:00, Fri., 22 Jun. 0.0369 0.0328 0.0353
04:01-05:00, Fri., 22 Jun. 0.0368 0.0330 0.0350
03:01-04:00, Fri., 22 Jun. 0.0371 0.0329 0.0348
02:01-03:00, Fri., 22 Jun. 0.0364 0.0331 0.0347
01:01-02:00, Fri., 22 Jun. 0.0370 0.0322 0.0349
00:01-01:00, Fri., 22 Jun. 0.0375 0.0330 0.0351
23:01-24:00, Thu., 21 Jun. 0.0380 0.0327 0.0350
22:01-23:00, Thu., 21 Jun. 0.0369 0.0327 0.0350
21:01-22:00, Thu., 21 Jun. 0.0364 0.0325 0.0347
20:01-21:00, Thu., 21 Jun. 0.0370 0.0331 0.0352
19:01-20:00, Thu., 21 Jun. 0.0370 0.0334 0.0350
18:01-19:00, Thu., 21 Jun. 0.0369 0.0328 0.0349
17:01-18:00, Thu., 21 Jun. 0.0365 0.0328 0.0348
16:01-17:00, Thu., 21 Jun. 0.0368 0.0320 0.0348
15:01-16:00, Thu., 21 Jun. 0.0368 0.0322 0.0349
14:01-15:00, Thu., 21 Jun. 0.0360 0.0319 0.0342
13:01-14:00, Thu., 21 Jun. 0.0361 0.0322 0.0344
12:01-13:00, Thu., 21 Jun. 0.0375 0.0319 0.0349
11:01-12:00, Thu., 21 Jun. 0.0366 0.0331 0.0353
10:01-11:00, Thu., 21 Jun. 0.0361 0.0310 0.0333
09:01-10:00, Thu., 21 Jun. 0.0339 0.0299 0.0322
08:01-09:00, Thu., 21 Jun. 0.0360 0.0307 0.0328
07:01-08:00, Thu., 21 Jun. 0.0364 0.0329 0.0345
06:01-07:00, Thu., 21 Jun. 0.0373 0.0332 0.0355
05:01-06:00, Thu., 21 Jun. 0.0443 0.0352 0.0392
04:01-05:00, Thu., 21 Jun. 0.0521 0.0388 0.0473
03:01-04:00, Thu., 21 Jun. 0.0523 0.0415 0.0455
02:01-03:00, Thu., 21 Jun. 0.0469 0.0354 0.0408
01:01-02:00, Thu., 21 Jun. 0.0391 0.0336 0.0358
00:01-01:00, Thu., 21 Jun. 0.0435 0.0352 0.0379
23:01-24:00, Wed., 20 Jun. 0.0467 0.0392 0.0435
22:01-23:00, Wed., 20 Jun. 0.0490 0.0402 0.0448
21:01-22:00, Wed., 20 Jun. 0.0457 0.0382 0.0427
20:01-21:00, Wed., 20 Jun. 0.0441 0.0360 0.0391
19:01-20:00, Wed., 20 Jun. 0.0399 0.0342 0.0362
18:01-19:00, Wed., 20 Jun. 0.0401 0.0347 0.0368
17:01-18:00, Wed., 20 Jun. 0.0377 0.0324 0.0351
16:01-17:00, Wed., 20 Jun. 0.0362 0.0327 0.0344
15:01-16:00, Wed., 20 Jun. 0.0370 0.0321 0.0344
14:01-15:00, Wed., 20 Jun. 0.0385 0.0323 0.0352
13:01-14:00, Wed., 20 Jun. 0.0381 0.0333 0.0359
12:01-13:00, Wed., 20 Jun. 0.0433 0.0358 0.0384
11:01-12:00, Wed., 20 Jun. 0.0448 0.0371 0.0409
10:01-11:00, Wed., 20 Jun. 0.0434 0.0353 0.0382
09:01-10:00, Wed., 20 Jun. 0.0415 0.0358 0.0379
08:01-09:00, Wed., 20 Jun. 0.0421 0.0366 0.0390
07:01-08:00, Wed., 20 Jun. 0.0438 0.0381 0.0409
06:01-07:00, Wed., 20 Jun. 0.0443 0.0361 0.0399
05:01-06:00, Wed., 20 Jun. 0.0412 0.0354 0.0380
04:01-05:00, Wed., 20 Jun. 0.0414 0.0356 0.0373
03:01-04:00, Wed., 20 Jun. 0.0386 0.0332 0.0358
02:01-03:00, Wed., 20 Jun. 0.0378 0.0336 0.0351
01:01-02:00, Wed., 20 Jun. 0.0367 0.0326 0.0347
00:01-01:00, Wed., 20 Jun. 0.0366 0.0330 0.0347
23:01-24:00, Tue., 19 Jun. 0.0372 0.0324 0.0346
22:01-23:00, Tue., 19 Jun. 0.0367 0.0328 0.0349
21:01-22:00, Tue., 19 Jun. 0.0369 0.0333 0.0347
20:01-21:00, Tue., 19 Jun. 0.0369 0.0323 0.0346
19:01-20:00, Tue., 19 Jun. 0.0368 0.0329 0.0347
18:01-19:00, Tue., 19 Jun. 0.0361 0.0324 0.0346
17:01-18:00, Tue., 19 Jun. 0.0367 0.0326 0.0348
16:01-17:00, Tue., 19 Jun. 0.0360 0.0323 0.0347
15:01-16:00, Tue., 19 Jun. 0.0371 0.0326 0.0344
14:01-15:00, Tue., 19 Jun. 0.0379 0.0319 0.0348
13:01-14:00, Tue., 19 Jun. 0.0374 0.0307 0.0347
12:01-13:00, Tue., 19 Jun. 0.0364 0.0317 0.0346
11:01-12:00, Tue., 19 Jun. 0.0369 0.0326 0.0349
10:01-11:00, Tue., 19 Jun. 0.0369 0.0324 0.0349
09:01-10:00, Tue., 19 Jun. 0.0371 0.0336 0.0351
08:01-09:00, Tue., 19 Jun. 0.0372 0.0326 0.0347
07:01-08:00, Tue., 19 Jun. 0.0385 0.0329 0.0349
06:01-07:00, Tue., 19 Jun. 0.0363 0.0312 0.0344
05:01-06:00, Tue., 19 Jun. 0.0367 0.0325 0.0345
04:01-05:00, Tue., 19 Jun. 0.0373 0.0331 0.0348
03:01-04:00, Tue., 19 Jun. 0.0371 0.0327 0.0349
02:01-03:00, Tue., 19 Jun. 0.0367 0.0328 0.0345
01:01-02:00, Tue., 19 Jun. 0.0370 0.0326 0.0345
00:01-01:00, Tue., 19 Jun. 0.0371 0.0319 0.0346
23:01-24:00, Mon., 18 Jun. 0.0364 0.0326 0.0349
22:01-23:00, Mon., 18 Jun. 0.0391 0.0339 0.0362
21:01-22:00, Mon., 18 Jun. 0.0386 0.0338 0.0362
20:01-21:00, Mon., 18 Jun. 0.0378 0.0323 0.0352
19:01-20:00, Mon., 18 Jun. 0.0373 0.0334 0.0353
18:01-19:00, Mon., 18 Jun. 0.0369 0.0326 0.0350
17:01-18:00, Mon., 18 Jun. 0.0366 0.0333 0.0349
16:01-17:00, Mon., 18 Jun. 0.0371 0.0331 0.0347
15:01-16:00, Mon., 18 Jun. 0.0370 0.0328 0.0349
14:01-15:00, Mon., 18 Jun. 0.0380 0.0329 0.0350
13:01-14:00, Mon., 18 Jun. 0.0364 0.0324 0.0350
12:01-13:00, Mon., 18 Jun. 0.0369 0.0329 0.0349
11:01-12:00, Mon., 18 Jun. 0.0370 0.0327 0.0347
10:01-11:00, Mon., 18 Jun. 0.0363 0.0324 0.0346
09:01-10:00, Mon., 18 Jun. 0.0375 0.0326 0.0349
08:01-09:00, Mon., 18 Jun. 0.0374 0.0331 0.0350
07:01-08:00, Mon., 18 Jun. 0.0369 0.0331 0.0349
06:01-07:00, Mon., 18 Jun. 0.0368 0.0328 0.0347
05:01-06:00, Mon., 18 Jun. 0.0384 0.0328 0.0351
04:01-05:00, Mon., 18 Jun. 0.0371 0.0327 0.0346
03:01-04:00, Mon., 18 Jun. 0.0365 0.0320 0.0347
02:01-03:00, Mon., 18 Jun. 0.0372 0.0327 0.0348
01:01-02:00, Mon., 18 Jun. 0.0360 0.0325 0.0344
00:01-01:00, Mon., 18 Jun. 0.0365 0.0323 0.0343
23:01-24:00, Sun., 17 Jun. 0.0364 0.0326 0.0346
22:01-23:00, Sun., 17 Jun. 0.0370 0.0328 0.0345
21:01-22:00, Sun., 17 Jun. 0.0368 0.0322 0.0346
20:01-21:00, Sun., 17 Jun. 0.0362 0.0324 0.0344
19:01-20:00, Sun., 17 Jun. 0.0386 0.0323 0.0346
18:01-19:00, Sun., 17 Jun. 0.0366 0.0330 0.0346
17:01-18:00, Sun., 17 Jun. 0.0370 0.0327 0.0346
16:01-17:00, Sun., 17 Jun. 0.0368 0.0320 0.0347
15:01-16:00, Sun., 17 Jun. 0.0362 0.0321 0.0344
14:01-15:00, Sun., 17 Jun. 0.0360 0.0319 0.0344
13:01-14:00, Sun., 17 Jun. 0.0368 0.0324 0.0345
12:01-13:00, Sun., 17 Jun. 0.0383 0.0324 0.0346
11:01-12:00, Sun., 17 Jun. 0.0363 0.0322 0.0346
10:01-11:00, Sun., 17 Jun. 0.0365 0.0321 0.0346
09:01-10:00, Sun., 17 Jun. 0.0362 0.0325 0.0345
08:01-09:00, Sun., 17 Jun. 0.0360 0.0324 0.0343
07:01-08:00, Sun., 17 Jun. 0.0365 0.0316 0.0344
06:01-07:00, Sun., 17 Jun. 0.0362 0.0323 0.0344
05:01-06:00, Sun., 17 Jun. 0.0367 0.0327 0.0345
04:01-05:00, Sun., 17 Jun. 0.0361 0.0326 0.0343
03:01-04:00, Sun., 17 Jun. 0.0363 0.0325 0.0343
02:01-03:00, Sun., 17 Jun. 0.0365 0.0327 0.0343
01:01-02:00, Sun., 17 Jun. 0.0362 0.0326 0.0344
00:01-01:00, Sun., 17 Jun. 0.0360 0.0322 0.0343
23:01-24:00, Sat., 16 Jun. 0.0360 0.0324 0.0343
22:01-23:00, Sat., 16 Jun. 0.0363 0.0325 0.0344
21:01-22:00, Sat., 16 Jun. 0.0361 0.0323 0.0340
20:01-21:00, Sat., 16 Jun. 0.0364 0.0323 0.0340
19:01-20:00, Sat., 16 Jun. 0.0365 0.0329 0.0346
18:01-19:00, Sat., 16 Jun. 0.0365 0.0326 0.0341
17:01-18:00, Sat., 16 Jun. 0.0364 0.0319 0.0342
16:01-17:00, Sat., 16 Jun. 0.0365 0.0318 0.0340
15:01-16:00, Sat., 16 Jun. 0.0365 0.0318 0.0341
14:01-15:00, Sat., 16 Jun. 0.0362 0.0327 0.0343
13:01-14:00, Sat., 16 Jun. 0.0371 0.0322 0.0342
12:01-13:00, Sat., 16 Jun. 0.0358 0.0315 0.0341
11:01-12:00, Sat., 16 Jun. 0.0371 0.0324 0.0344
10:01-11:00, Sat., 16 Jun. 0.0368 0.0325 0.0346
09:01-10:00, Sat., 16 Jun. 0.0371 0.0328 0.0350
08:01-09:00, Sat., 16 Jun. 0.0371 0.0328 0.0354
07:01-08:00, Sat., 16 Jun. 0.0366 0.0335 0.0351
06:01-07:00, Sat., 16 Jun. 0.0388 0.0340 0.0361
05:01-06:00, Sat., 16 Jun. 0.0439 0.0362 0.0399
04:01-05:00, Sat., 16 Jun. 0.0437 0.0364 0.0396
03:01-04:00, Sat., 16 Jun. 0.0402 0.0340 0.0364
02:01-03:00, Sat., 16 Jun. 0.0362 0.0331 0.0349
01:01-02:00, Sat., 16 Jun. 0.0364 0.0327 0.0348
00:01-01:00, Sat., 16 Jun. 0.0366 0.0327 0.0348
23:01-24:00, Fri., 15 Jun. 0.0366 0.0318 0.0345
22:01-23:00, Fri., 15 Jun. 0.0363 0.0325 0.0344
21:01-22:00, Fri., 15 Jun. 0.0370 0.0317 0.0342
20:01-21:00, Fri., 15 Jun. 0.0363 0.0321 0.0343
19:01-20:00, Fri., 15 Jun. 0.0368 0.0317 0.0344
18:01-19:00, Fri., 15 Jun. 0.0363 0.0325 0.0343
17:01-18:00, Fri., 15 Jun. 0.0365 0.0324 0.0345
16:01-17:00, Fri., 15 Jun. 0.0362 0.0327 0.0347
15:01-16:00, Fri., 15 Jun. 0.0388 0.0334 0.0359
14:01-15:00, Fri., 15 Jun. 0.0411 0.0348 0.0380
13:01-14:00, Fri., 15 Jun. 0.0437 0.0370 0.0401
12:01-13:00, Fri., 15 Jun. 0.0469 0.0382 0.0421
11:01-12:00, Fri., 15 Jun. 0.0472 0.0360 0.0420
10:01-11:00, Fri., 15 Jun. 0.0413 0.0361 0.0382
09:01-10:00, Fri., 15 Jun. 0.0404 0.0344 0.0370
08:01-09:00, Fri., 15 Jun. 0.0370 0.0327 0.0352
07:01-08:00, Fri., 15 Jun. 0.0366 0.0327 0.0349
06:01-07:00, Fri., 15 Jun. 0.0366 0.0323 0.0349
05:01-06:00, Fri., 15 Jun. 0.0371 0.0331 0.0351
04:01-05:00, Fri., 15 Jun. 0.0373 0.0320 0.0348
03:01-04:00, Fri., 15 Jun. 0.0366 0.0334 0.0350
02:01-03:00, Fri., 15 Jun. 0.0370 0.0327 0.0348
01:01-02:00, Fri., 15 Jun. 0.0369 0.0330 0.0347
00:01-01:00, Fri., 15 Jun. 0.0365 0.0325 0.0347
23:01-24:00, Thu., 14 Jun. 0.0375 0.0321 0.0348
22:01-23:00, Thu., 14 Jun. 0.0367 0.0327 0.0347
21:01-22:00, Thu., 14 Jun. 0.0367 0.0320 0.0349
20:01-21:00, Thu., 14 Jun. 0.0364 0.0324 0.0349