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

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 10:00 to 13:00 on Tuesday, October 24,2017 Hachioji
From 13:00 to 16:00 on Tuesday, October 24,2017 Adachi
From 10:00 to 13:00 on Wednesday, October 25,2017 Chofu
From 13:00 to 16:00 on Wednesday, October 25,2017 Ota
From 10:00 to 13:00 on Thursday, October 26,2017 Kodaira
From 13:00 to 16:00 on Thursday, October 26,2017 Edogawa
From 10:00 to 13:00 on Friday, October 27,2017 Shinjuku

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 8:00 to 19:00 on Saturday, October 28,2017






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
11:01-12:00, Tue., 17 Oct. 0.0403 0.0349 0.0373
10:01-11:00, Tue., 17 Oct. 0.0403 0.0353 0.0372
09:01-10:00, Tue., 17 Oct. 0.0373 0.0334 0.0356
08:01-09:00, Tue., 17 Oct. 0.0376 0.0336 0.0357
07:01-08:00, Tue., 17 Oct. 0.0417 0.0344 0.0379
06:01-07:00, Tue., 17 Oct. 0.0443 0.0363 0.0396
05:01-06:00, Tue., 17 Oct. 0.0465 0.0365 0.0421
04:01-05:00, Tue., 17 Oct. 0.0436 0.0364 0.0391
03:01-04:00, Tue., 17 Oct. 0.0437 0.0363 0.0398
02:01-03:00, Tue., 17 Oct. 0.0429 0.0355 0.0394
01:01-02:00, Tue., 17 Oct. 0.0411 0.0342 0.0369
00:01-01:00, Tue., 17 Oct. 0.0430 0.0361 0.0391
23:01-24:00, Mon., 16 Oct. 0.0421 0.0370 0.0395
22:01-23:00, Mon., 16 Oct. 0.0447 0.0368 0.0415
21:01-22:00, Mon., 16 Oct. 0.0471 0.0408 0.0439
20:01-21:00, Mon., 16 Oct. 0.0453 0.0378 0.0414
19:01-20:00, Mon., 16 Oct. 0.0469 0.0363 0.0422
18:01-19:00, Mon., 16 Oct. 0.0511 0.0439 0.0475
17:01-18:00, Mon., 16 Oct. 0.0537 0.0457 0.0495
16:01-17:00, Mon., 16 Oct. 0.0535 0.0443 0.0489
15:01-16:00, Mon., 16 Oct. 0.0486 0.0400 0.0445
14:01-15:00, Mon., 16 Oct. 0.0483 0.0376 0.0427
13:01-14:00, Mon., 16 Oct. 0.0501 0.0431 0.0469
12:01-13:00, Mon., 16 Oct. 0.0501 0.0421 0.0471
11:01-12:00, Mon., 16 Oct. 0.0525 0.0422 0.0479
10:01-11:00, Mon., 16 Oct. 0.0561 0.0485 0.0521
09:01-10:00, Mon., 16 Oct. 0.0615 0.0526 0.0563
08:01-09:00, Mon., 16 Oct. 0.0596 0.0501 0.0546
07:01-08:00, Mon., 16 Oct. 0.0583 0.0507 0.0534
06:01-07:00, Mon., 16 Oct. 0.0614 0.0502 0.0556
05:01-06:00, Mon., 16 Oct. 0.0586 0.0466 0.0529
04:01-05:00, Mon., 16 Oct. 0.0563 0.0485 0.0526
03:01-04:00, Mon., 16 Oct. 0.0558 0.0471 0.0516
02:01-03:00, Mon., 16 Oct. 0.0529 0.0397 0.0465
01:01-02:00, Mon., 16 Oct. 0.0455 0.0367 0.0404
00:01-01:00, Mon., 16 Oct. 0.0401 0.0343 0.0368
23:01-24:00, Sun., 15 Oct. 0.0437 0.0348 0.0384
22:01-23:00, Sun., 15 Oct. 0.0458 0.0387 0.0425
21:01-22:00, Sun., 15 Oct. 0.0452 0.0351 0.0381
20:01-21:00, Sun., 15 Oct. 0.0391 0.0320 0.0354
19:01-20:00, Sun., 15 Oct. 0.0359 0.0310 0.0328
18:01-19:00, Sun., 15 Oct. 0.0361 0.0307 0.0331
17:01-18:00, Sun., 15 Oct. 0.0353 0.0297 0.0331
16:01-17:00, Sun., 15 Oct. 0.0349 0.0309 0.0328
15:01-16:00, Sun., 15 Oct. 0.0354 0.0309 0.0335
14:01-15:00, Sun., 15 Oct. 0.0358 0.0318 0.0342
13:01-14:00, Sun., 15 Oct. 0.0371 0.0334 0.0349
12:01-13:00, Sun., 15 Oct. 0.0407 0.0340 0.0362
11:01-12:00, Sun., 15 Oct. 0.0402 0.0338 0.0358
10:01-11:00, Sun., 15 Oct. 0.0358 0.0321 0.0339
09:01-10:00, Sun., 15 Oct. 0.0372 0.0327 0.0346
08:01-09:00, Sun., 15 Oct. 0.0393 0.0337 0.0356
07:01-08:00, Sun., 15 Oct. 0.0404 0.0339 0.0365
06:01-07:00, Sun., 15 Oct. 0.0368 0.0308 0.0343
05:01-06:00, Sun., 15 Oct. 0.0348 0.0308 0.0325
04:01-05:00, Sun., 15 Oct. 0.0343 0.0306 0.0321
03:01-04:00, Sun., 15 Oct. 0.0342 0.0307 0.0322
02:01-03:00, Sun., 15 Oct. 0.0344 0.0295 0.0321
01:01-02:00, Sun., 15 Oct. 0.0340 0.0296 0.0321
00:01-01:00, Sun., 15 Oct. 0.0346 0.0303 0.0325
23:01-24:00, Sat., 14 Oct. 0.0332 0.0293 0.0316
22:01-23:00, Sat., 14 Oct. 0.0341 0.0298 0.0319
21:01-22:00, Sat., 14 Oct. 0.0339 0.0301 0.0318
20:01-21:00, Sat., 14 Oct. 0.0339 0.0299 0.0316
19:01-20:00, Sat., 14 Oct. 0.0331 0.0298 0.0315
18:01-19:00, Sat., 14 Oct. 0.0332 0.0297 0.0314
17:01-18:00, Sat., 14 Oct. 0.0337 0.0291 0.0315
16:01-17:00, Sat., 14 Oct. 0.0340 0.0292 0.0316
15:01-16:00, Sat., 14 Oct. 0.0335 0.0293 0.0315
14:01-15:00, Sat., 14 Oct. 0.0337 0.0294 0.0318
13:01-14:00, Sat., 14 Oct. 0.0348 0.0302 0.0326
12:01-13:00, Sat., 14 Oct. 0.0373 0.0321 0.0350
11:01-12:00, Sat., 14 Oct. 0.0359 0.0304 0.0330
10:01-11:00, Sat., 14 Oct. 0.0363 0.0315 0.0332
09:01-10:00, Sat., 14 Oct. 0.0410 0.0330 0.0360
08:01-09:00, Sat., 14 Oct. 0.0435 0.0360 0.0392
07:01-08:00, Sat., 14 Oct. 0.0445 0.0322 0.0378
06:01-07:00, Sat., 14 Oct. 0.0382 0.0318 0.0347
05:01-06:00, Sat., 14 Oct. 0.0471 0.0348 0.0412
04:01-05:00, Sat., 14 Oct. 0.0469 0.0405 0.0441
03:01-04:00, Sat., 14 Oct. 0.0499 0.0411 0.0459
02:01-03:00, Sat., 14 Oct. 0.0498 0.0429 0.0452
01:01-02:00, Sat., 14 Oct. 0.0470 0.0404 0.0439
00:01-01:00, Sat., 14 Oct. 0.0463 0.0342 0.0408
23:01-24:00, Fri., 13 Oct. 0.0370 0.0319 0.0347
22:01-23:00, Fri., 13 Oct. 0.0362 0.0315 0.0335
21:01-22:00, Fri., 13 Oct. 0.0344 0.0301 0.0320
20:01-21:00, Fri., 13 Oct. 0.0337 0.0295 0.0316
19:01-20:00, Fri., 13 Oct. 0.0349 0.0299 0.0323
18:01-19:00, Fri., 13 Oct. 0.0401 0.0321 0.0348
17:01-18:00, Fri., 13 Oct. 0.0408 0.0338 0.0367
16:01-17:00, Fri., 13 Oct. 0.0435 0.0354 0.0385
15:01-16:00, Fri., 13 Oct. 0.0399 0.0325 0.0357
14:01-15:00, Fri., 13 Oct. 0.0404 0.0344 0.0374
13:01-14:00, Fri., 13 Oct. 0.0404 0.0336 0.0366
12:01-13:00, Fri., 13 Oct. 0.0448 0.0354 0.0399
11:01-12:00, Fri., 13 Oct. 0.0471 0.0385 0.0422
10:01-11:00, Fri., 13 Oct. 0.0444 0.0366 0.0405
09:01-10:00, Fri., 13 Oct. 0.0454 0.0389 0.0422
08:01-09:00, Fri., 13 Oct. 0.0487 0.0411 0.0449
07:01-08:00, Fri., 13 Oct. 0.0477 0.0413 0.0446
06:01-07:00, Fri., 13 Oct. 0.0483 0.0423 0.0452
05:01-06:00, Fri., 13 Oct. 0.0450 0.0347 0.0387
04:01-05:00, Fri., 13 Oct. 0.0359 0.0311 0.0334
03:01-04:00, Fri., 13 Oct. 0.0346 0.0292 0.0324
02:01-03:00, Fri., 13 Oct. 0.0341 0.0300 0.0324
01:01-02:00, Fri., 13 Oct. 0.0345 0.0303 0.0325
00:01-01:00, Fri., 13 Oct. 0.0344 0.0312 0.0325
23:01-24:00, Thu., 12 Oct. 0.0349 0.0299 0.0323
22:01-23:00, Thu., 12 Oct. 0.0349 0.0302 0.0325
21:01-22:00, Thu., 12 Oct. 0.0345 0.0305 0.0326
20:01-21:00, Thu., 12 Oct. 0.0344 0.0307 0.0326
19:01-20:00, Thu., 12 Oct. 0.0349 0.0315 0.0333
18:01-19:00, Thu., 12 Oct. 0.0360 0.0298 0.0332
17:01-18:00, Thu., 12 Oct. 0.0354 0.0304 0.0325
16:01-17:00, Thu., 12 Oct. 0.0349 0.0307 0.0329
15:01-16:00, Thu., 12 Oct. 0.0349 0.0304 0.0327
14:01-15:00, Thu., 12 Oct. 0.0347 0.0307 0.0328
13:01-14:00, Thu., 12 Oct. 0.0348 0.0308 0.0328
12:01-13:00, Thu., 12 Oct. 0.0341 0.0311 0.0326
11:01-12:00, Thu., 12 Oct. 0.0348 0.0304 0.0328
10:01-11:00, Thu., 12 Oct. 0.0348 0.0306 0.0329
09:01-10:00, Thu., 12 Oct. 0.0347 0.0310 0.0329
08:01-09:00, Thu., 12 Oct. 0.0348 0.0309 0.0330
07:01-08:00, Thu., 12 Oct. 0.0347 0.0306 0.0332
06:01-07:00, Thu., 12 Oct. 0.0353 0.0313 0.0330
05:01-06:00, Thu., 12 Oct. 0.0354 0.0303 0.0327
04:01-05:00, Thu., 12 Oct. 0.0352 0.0303 0.0327
03:01-04:00, Thu., 12 Oct. 0.0356 0.0306 0.0325
02:01-03:00, Thu., 12 Oct. 0.0347 0.0302 0.0322
01:01-02:00, Thu., 12 Oct. 0.0351 0.0293 0.0324
00:01-01:00, Thu., 12 Oct. 0.0344 0.0308 0.0324
23:01-24:00, Wed., 11 Oct. 0.0350 0.0293 0.0320
22:01-23:00, Wed., 11 Oct. 0.0341 0.0303 0.0324
21:01-22:00, Wed., 11 Oct. 0.0345 0.0303 0.0323
20:01-21:00, Wed., 11 Oct. 0.0340 0.0298 0.0321
19:01-20:00, Wed., 11 Oct. 0.0340 0.0302 0.0321
18:01-19:00, Wed., 11 Oct. 0.0357 0.0297 0.0323
17:01-18:00, Wed., 11 Oct. 0.0342 0.0304 0.0322
16:01-17:00, Wed., 11 Oct. 0.0338 0.0304 0.0320
15:01-16:00, Wed., 11 Oct. 0.0347 0.0305 0.0322
14:01-15:00, Wed., 11 Oct. 0.0340 0.0292 0.0323
13:01-14:00, Wed., 11 Oct. 0.0348 0.0295 0.0325
12:01-13:00, Wed., 11 Oct. 0.0348 0.0307 0.0326
11:01-12:00, Wed., 11 Oct. 0.0348 0.0305 0.0323
10:01-11:00, Wed., 11 Oct. 0.0353 0.0309 0.0328
09:01-10:00, Wed., 11 Oct. 0.0360 0.0308 0.0332
08:01-09:00, Wed., 11 Oct. 0.0359 0.0315 0.0336
07:01-08:00, Wed., 11 Oct. 0.0356 0.0319 0.0337
06:01-07:00, Wed., 11 Oct. 0.0374 0.0326 0.0345
05:01-06:00, Wed., 11 Oct. 0.0367 0.0323 0.0343
04:01-05:00, Wed., 11 Oct. 0.0359 0.0321 0.0340
03:01-04:00, Wed., 11 Oct. 0.0363 0.0317 0.0339
02:01-03:00, Wed., 11 Oct. 0.0362 0.0321 0.0338
01:01-02:00, Wed., 11 Oct. 0.0364 0.0311 0.0339
00:01-01:00, Wed., 11 Oct. 0.0360 0.0324 0.0342
23:01-24:00, Tue., 10 Oct. 0.0357 0.0313 0.0335
22:01-23:00, Tue., 10 Oct. 0.0344 0.0309 0.0326
21:01-22:00, Tue., 10 Oct. 0.0352 0.0315 0.0331
20:01-21:00, Tue., 10 Oct. 0.0344 0.0298 0.0325
19:01-20:00, Tue., 10 Oct. 0.0342 0.0303 0.0322
18:01-19:00, Tue., 10 Oct. 0.0345 0.0303 0.0322
17:01-18:00, Tue., 10 Oct. 0.0339 0.0304 0.0322
16:01-17:00, Tue., 10 Oct. 0.0340 0.0300 0.0318
15:01-16:00, Tue., 10 Oct. 0.0342 0.0302 0.0323
14:01-15:00, Tue., 10 Oct. 0.0344 0.0298 0.0323
13:01-14:00, Tue., 10 Oct. 0.0344 0.0302 0.0325
12:01-13:00, Tue., 10 Oct. 0.0346 0.0308 0.0325
11:01-12:00, Tue., 10 Oct. 0.0351 0.0308 0.0329
10:01-11:00, Tue., 10 Oct. 0.0359 0.0310 0.0328
09:01-10:00, Tue., 10 Oct. 0.0343 0.0304 0.0326
08:01-09:00, Tue., 10 Oct. 0.0343 0.0305 0.0325
07:01-08:00, Tue., 10 Oct. 0.0348 0.0304 0.0328
06:01-07:00, Tue., 10 Oct. 0.0352 0.0300 0.0327
05:01-06:00, Tue., 10 Oct. 0.0345 0.0310 0.0330
04:01-05:00, Tue., 10 Oct. 0.0351 0.0304 0.0334
03:01-04:00, Tue., 10 Oct. 0.0346 0.0309 0.0331
02:01-03:00, Tue., 10 Oct. 0.0352 0.0305 0.0326
01:01-02:00, Tue., 10 Oct. 0.0344 0.0306 0.0324
00:01-01:00, Tue., 10 Oct. 0.0349 0.0306 0.0327
23:01-24:00, Mon., 09 Oct. 0.0350 0.0298 0.0319
22:01-23:00, Mon., 09 Oct. 0.0333 0.0299 0.0316
21:01-22:00, Mon., 09 Oct. 0.0332 0.0298 0.0314
20:01-21:00, Mon., 09 Oct. 0.0333 0.0293 0.0314
19:01-20:00, Mon., 09 Oct. 0.0328 0.0299 0.0314
18:01-19:00, Mon., 09 Oct. 0.0332 0.0299 0.0315
17:01-18:00, Mon., 09 Oct. 0.0337 0.0283 0.0311
16:01-17:00, Mon., 09 Oct. 0.0332 0.0295 0.0312
15:01-16:00, Mon., 09 Oct. 0.0333 0.0298 0.0317
14:01-15:00, Mon., 09 Oct. 0.0335 0.0283 0.0312
13:01-14:00, Mon., 09 Oct. 0.0332 0.0289 0.0313
12:01-13:00, Mon., 09 Oct. 0.0329 0.0288 0.0312
11:01-12:00, Mon., 09 Oct. 0.0331 0.0296 0.0316
10:01-11:00, Mon., 09 Oct. 0.0337 0.0295 0.0313
09:01-10:00, Mon., 09 Oct. 0.0340 0.0293 0.0313
08:01-09:00, Mon., 09 Oct. 0.0333 0.0290 0.0312
07:01-08:00, Mon., 09 Oct. 0.0338 0.0297 0.0313
06:01-07:00, Mon., 09 Oct. 0.0339 0.0294 0.0312
05:01-06:00, Mon., 09 Oct. 0.0334 0.0295 0.0312
04:01-05:00, Mon., 09 Oct. 0.0334 0.0288 0.0314
03:01-04:00, Mon., 09 Oct. 0.0334 0.0295 0.0315
02:01-03:00, Mon., 09 Oct. 0.0346 0.0290 0.0315
01:01-02:00, Mon., 09 Oct. 0.0330 0.0294 0.0314
00:01-01:00, Mon., 09 Oct. 0.0336 0.0285 0.0311
23:01-24:00, Sun., 08 Oct. 0.0325 0.0290 0.0310
22:01-23:00, Sun., 08 Oct. 0.0336 0.0292 0.0308
21:01-22:00, Sun., 08 Oct. 0.0328 0.0287 0.0309
20:01-21:00, Sun., 08 Oct. 0.0336 0.0290 0.0312
19:01-20:00, Sun., 08 Oct. 0.0331 0.0273 0.0311
18:01-19:00, Sun., 08 Oct. 0.0349 0.0293 0.0313
17:01-18:00, Sun., 08 Oct. 0.0334 0.0293 0.0312
16:01-17:00, Sun., 08 Oct. 0.0327 0.0296 0.0312
15:01-16:00, Sun., 08 Oct. 0.0335 0.0297 0.0314
14:01-15:00, Sun., 08 Oct. 0.0336 0.0297 0.0314
13:01-14:00, Sun., 08 Oct. 0.0330 0.0296 0.0314
12:01-13:00, Sun., 08 Oct. 0.0336 0.0300 0.0316
11:01-12:00, Sun., 08 Oct. 0.0333 0.0292 0.0317
10:01-11:00, Sun., 08 Oct. 0.0338 0.0297 0.0316
09:01-10:00, Sun., 08 Oct. 0.0338 0.0301 0.0318
08:01-09:00, Sun., 08 Oct. 0.0342 0.0306 0.0320
07:01-08:00, Sun., 08 Oct. 0.0345 0.0298 0.0322
06:01-07:00, Sun., 08 Oct. 0.0341 0.0303 0.0324
05:01-06:00, Sun., 08 Oct. 0.0344 0.0304 0.0325
04:01-05:00, Sun., 08 Oct. 0.0337 0.0305 0.0321
03:01-04:00, Sun., 08 Oct. 0.0343 0.0290 0.0320
02:01-03:00, Sun., 08 Oct. 0.0345 0.0301 0.0320
01:01-02:00, Sun., 08 Oct. 0.0344 0.0298 0.0316
00:01-01:00, Sun., 08 Oct. 0.0327 0.0298 0.0311
23:01-24:00, Sat., 07 Oct. 0.0335 0.0292 0.0311
22:01-23:00, Sat., 07 Oct. 0.0341 0.0287 0.0312
21:01-22:00, Sat., 07 Oct. 0.0328 0.0287 0.0308
20:01-21:00, Sat., 07 Oct. 0.0339 0.0283 0.0311
19:01-20:00, Sat., 07 Oct. 0.0335 0.0298 0.0310
18:01-19:00, Sat., 07 Oct. 0.0333 0.0288 0.0307
17:01-18:00, Sat., 07 Oct. 0.0332 0.0286 0.0307
16:01-17:00, Sat., 07 Oct. 0.0325 0.0281 0.0306
15:01-16:00, Sat., 07 Oct. 0.0332 0.0290 0.0309
14:01-15:00, Sat., 07 Oct. 0.0332 0.0273 0.0305
13:01-14:00, Sat., 07 Oct. 0.0333 0.0285 0.0307
12:01-13:00, Sat., 07 Oct. 0.0332 0.0288 0.0308