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

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. 0.0404 0.0354 0.0372
10:01-11:00, Tue., 17 Oct. 0.0401 0.0340 0.0368
09:01-10:00, Tue., 17 Oct. 0.0372 0.0332 0.0355
08:01-09:00, Tue., 17 Oct. 0.0385 0.0335 0.0356
07:01-08:00, Tue., 17 Oct. 0.0396 0.0336 0.0360
06:01-07:00, Tue., 17 Oct. 0.0384 0.0332 0.0357
05:01-06:00, Tue., 17 Oct. 0.0424 0.0344 0.0373
04:01-05:00, Tue., 17 Oct. 0.0398 0.0336 0.0358
03:01-04:00, Tue., 17 Oct. 0.0451 0.0359 0.0408
02:01-03:00, Tue., 17 Oct. 0.0472 0.0361 0.0408
01:01-02:00, Tue., 17 Oct. 0.0434 0.0358 0.0396
00:01-01:00, Tue., 17 Oct. 0.0435 0.0342 0.0385
23:01-24:00, Mon., 16 Oct. 0.0421 0.0359 0.0386
22:01-23:00, Mon., 16 Oct. 0.0467 0.0368 0.0426
21:01-22:00, Mon., 16 Oct. 0.0456 0.0364 0.0403
20:01-21:00, Mon., 16 Oct. 0.0403 0.0343 0.0367
19:01-20:00, Mon., 16 Oct. 0.0439 0.0359 0.0397
18:01-19:00, Mon., 16 Oct. 0.0540 0.0408 0.0473
17:01-18:00, Mon., 16 Oct. 0.0582 0.0491 0.0532
16:01-17:00, Mon., 16 Oct. 0.0605 0.0510 0.0570
15:01-16:00, Mon., 16 Oct. 0.0564 0.0446 0.0496
14:01-15:00, Mon., 16 Oct. 0.0584 0.0465 0.0531
13:01-14:00, Mon., 16 Oct. 0.0562 0.0506 0.0536
12:01-13:00, Mon., 16 Oct. 0.0557 0.0397 0.0461
11:01-12:00, Mon., 16 Oct. 0.0493 0.0406 0.0452
10:01-11:00, Mon., 16 Oct. 0.0532 0.0455 0.0481
09:01-10:00, Mon., 16 Oct. 0.0490 0.0412 0.0451
08:01-09:00, Mon., 16 Oct. 0.0517 0.0437 0.0473
07:01-08:00, Mon., 16 Oct. 0.0541 0.0413 0.0460
06:01-07:00, Mon., 16 Oct. 0.0536 0.0422 0.0467
05:01-06:00, Mon., 16 Oct. 0.0531 0.0444 0.0487
04:01-05:00, Mon., 16 Oct. 0.0515 0.0419 0.0476
03:01-04:00, Mon., 16 Oct. 0.0516 0.0425 0.0476
02:01-03:00, Mon., 16 Oct. 0.0533 0.0442 0.0489
01:01-02:00, Mon., 16 Oct. 0.0534 0.0426 0.0487
00:01-01:00, Mon., 16 Oct. 0.0475 0.0388 0.0438
23:01-24:00, Sun., 15 Oct. 0.0432 0.0364 0.0402
22:01-23:00, Sun., 15 Oct. 0.0409 0.0351 0.0384
21:01-22:00, Sun., 15 Oct. 0.0372 0.0323 0.0346
20:01-21:00, Sun., 15 Oct. 0.0363 0.0311 0.0336
19:01-20:00, Sun., 15 Oct. 0.0352 0.0310 0.0327
18:01-19:00, Sun., 15 Oct. 0.0345 0.0302 0.0324
17:01-18:00, Sun., 15 Oct. 0.0347 0.0300 0.0327
16:01-17:00, Sun., 15 Oct. 0.0356 0.0309 0.0334
15:01-16:00, Sun., 15 Oct. 0.0360 0.0314 0.0339
14:01-15:00, Sun., 15 Oct. 0.0353 0.0315 0.0334
13:01-14:00, Sun., 15 Oct. 0.0365 0.0321 0.0342
12:01-13:00, Sun., 15 Oct. 0.0380 0.0327 0.0354
11:01-12:00, Sun., 15 Oct. 0.0369 0.0329 0.0349
10:01-11:00, Sun., 15 Oct. 0.0368 0.0322 0.0342
09:01-10:00, Sun., 15 Oct. 0.0367 0.0323 0.0346
08:01-09:00, Sun., 15 Oct. 0.0392 0.0339 0.0359
07:01-08:00, Sun., 15 Oct. 0.0375 0.0327 0.0355
06:01-07:00, Sun., 15 Oct. 0.0366 0.0309 0.0325
05:01-06:00, Sun., 15 Oct. 0.0339 0.0305 0.0322
04:01-05:00, Sun., 15 Oct. 0.0349 0.0307 0.0324
03:01-04:00, Sun., 15 Oct. 0.0343 0.0302 0.0317
02:01-03:00, Sun., 15 Oct. 0.0334 0.0304 0.0318
01:01-02:00, Sun., 15 Oct. 0.0335 0.0294 0.0318
00:01-01:00, Sun., 15 Oct. 0.0332 0.0295 0.0315
23:01-24:00, Sat., 14 Oct. 0.0335 0.0297 0.0317
22:01-23:00, Sat., 14 Oct. 0.0337 0.0298 0.0317
21:01-22:00, Sat., 14 Oct. 0.0351 0.0304 0.0330
20:01-21:00, Sat., 14 Oct. 0.0385 0.0329 0.0349
19:01-20:00, Sat., 14 Oct. 0.0395 0.0338 0.0368
18:01-19:00, Sat., 14 Oct. 0.0419 0.0343 0.0366
17:01-18:00, Sat., 14 Oct. 0.0367 0.0325 0.0350
16:01-17:00, Sat., 14 Oct. 0.0365 0.0314 0.0337
15:01-16:00, Sat., 14 Oct. 0.0345 0.0298 0.0320
14:01-15:00, Sat., 14 Oct. 0.0337 0.0297 0.0319
13:01-14:00, Sat., 14 Oct. 0.0355 0.0308 0.0330
12:01-13:00, Sat., 14 Oct. 0.0369 0.0328 0.0347
11:01-12:00, Sat., 14 Oct. 0.0353 0.0303 0.0326
10:01-11:00, Sat., 14 Oct. 0.0372 0.0321 0.0346
09:01-10:00, Sat., 14 Oct. 0.0363 0.0323 0.0344
08:01-09:00, Sat., 14 Oct. 0.0401 0.0334 0.0364
07:01-08:00, Sat., 14 Oct. 0.0408 0.0326 0.0362
06:01-07:00, Sat., 14 Oct. 0.0409 0.0331 0.0363
05:01-06:00, Sat., 14 Oct. 0.0464 0.0368 0.0420
04:01-05:00, Sat., 14 Oct. 0.0483 0.0410 0.0448
03:01-04:00, Sat., 14 Oct. 0.0487 0.0401 0.0450
02:01-03:00, Sat., 14 Oct. 0.0471 0.0378 0.0425
01:01-02:00, Sat., 14 Oct. 0.0417 0.0355 0.0384
00:01-01:00, Sat., 14 Oct. 0.0399 0.0340 0.0363
23:01-24:00, Fri., 13 Oct. 0.0370 0.0316 0.0347
22:01-23:00, Fri., 13 Oct. 0.0344 0.0298 0.0322
21:01-22:00, Fri., 13 Oct. 0.0350 0.0313 0.0329
20:01-21:00, Fri., 13 Oct. 0.0343 0.0307 0.0325
19:01-20:00, Fri., 13 Oct. 0.0359 0.0314 0.0334
18:01-19:00, Fri., 13 Oct. 0.0370 0.0326 0.0349
17:01-18:00, Fri., 13 Oct. 0.0428 0.0346 0.0382
16:01-17:00, Fri., 13 Oct. 0.0447 0.0378 0.0410
15:01-16:00, Fri., 13 Oct. 0.0448 0.0373 0.0406
14:01-15:00, Fri., 13 Oct. 0.0458 0.0353 0.0396
13:01-14:00, Fri., 13 Oct. 0.0372 0.0321 0.0344
12:01-13:00, Fri., 13 Oct. 0.0370 0.0325 0.0349
11:01-12:00, Fri., 13 Oct. 0.0400 0.0338 0.0361
10:01-11:00, Fri., 13 Oct. 0.0432 0.0357 0.0387
09:01-10:00, Fri., 13 Oct. 0.0439 0.0347 0.0388
08:01-09:00, Fri., 13 Oct. 0.0428 0.0370 0.0403
07:01-08:00, Fri., 13 Oct. 0.0442 0.0363 0.0394
06:01-07:00, Fri., 13 Oct. 0.0419 0.0326 0.0369
05:01-06:00, Fri., 13 Oct. 0.0354 0.0311 0.0330
04:01-05:00, Fri., 13 Oct. 0.0345 0.0303 0.0321
03:01-04:00, Fri., 13 Oct. 0.0334 0.0302 0.0318
02:01-03:00, Fri., 13 Oct. 0.0338 0.0299 0.0321
01:01-02:00, Fri., 13 Oct. 0.0353 0.0296 0.0319
00:01-01:00, Fri., 13 Oct. 0.0342 0.0300 0.0321
23:01-24:00, Thu., 12 Oct. 0.0353 0.0302 0.0328
22:01-23:00, Thu., 12 Oct. 0.0366 0.0317 0.0345
21:01-22:00, Thu., 12 Oct. 0.0380 0.0321 0.0348
20:01-21:00, Thu., 12 Oct. 0.0369 0.0310 0.0340
19:01-20:00, Thu., 12 Oct. 0.0344 0.0301 0.0319
18:01-19:00, Thu., 12 Oct. 0.0343 0.0295 0.0321
17:01-18:00, Thu., 12 Oct. 0.0340 0.0296 0.0320
16:01-17:00, Thu., 12 Oct. 0.0341 0.0303 0.0323
15:01-16:00, Thu., 12 Oct. 0.0346 0.0302 0.0322
14:01-15:00, Thu., 12 Oct. 0.0345 0.0301 0.0323
13:01-14:00, Thu., 12 Oct. 0.0343 0.0299 0.0323
12:01-13:00, Thu., 12 Oct. 0.0342 0.0297 0.0323
11:01-12:00, Thu., 12 Oct. 0.0338 0.0306 0.0323
10:01-11:00, Thu., 12 Oct. 0.0339 0.0308 0.0323
09:01-10:00, Thu., 12 Oct. 0.0347 0.0301 0.0323
08:01-09:00, Thu., 12 Oct. 0.0341 0.0299 0.0321
07:01-08:00, Thu., 12 Oct. 0.0342 0.0293 0.0315
06:01-07:00, Thu., 12 Oct. 0.0343 0.0300 0.0318
05:01-06:00, Thu., 12 Oct. 0.0335 0.0300 0.0319
04:01-05:00, Thu., 12 Oct. 0.0340 0.0295 0.0319
03:01-04:00, Thu., 12 Oct. 0.0333 0.0300 0.0319
02:01-03:00, Thu., 12 Oct. 0.0340 0.0297 0.0320
01:01-02:00, Thu., 12 Oct. 0.0343 0.0306 0.0322
00:01-01:00, Thu., 12 Oct. 0.0339 0.0300 0.0319
23:01-24:00, Wed., 11 Oct. 0.0340 0.0302 0.0320
22:01-23:00, Wed., 11 Oct. 0.0338 0.0300 0.0319
21:01-22:00, Wed., 11 Oct. 0.0340 0.0302 0.0321
20:01-21:00, Wed., 11 Oct. 0.0345 0.0304 0.0324
19:01-20:00, Wed., 11 Oct. 0.0346 0.0311 0.0329
18:01-19:00, Wed., 11 Oct. 0.0361 0.0310 0.0332
17:01-18:00, Wed., 11 Oct. 0.0332 0.0294 0.0312
16:01-17:00, Wed., 11 Oct. 0.0327 0.0289 0.0307
15:01-16:00, Wed., 11 Oct. 0.0335 0.0290 0.0311
14:01-15:00, Wed., 11 Oct. 0.0332 0.0290 0.0308
13:01-14:00, Wed., 11 Oct. 0.0327 0.0290 0.0309
12:01-13:00, Wed., 11 Oct. 0.0330 0.0293 0.0308
11:01-12:00, Wed., 11 Oct. 0.0336 0.0300 0.0315
10:01-11:00, Wed., 11 Oct. 0.0337 0.0297 0.0318
09:01-10:00, Wed., 11 Oct. 0.0341 0.0301 0.0323
08:01-09:00, Wed., 11 Oct. 0.0352 0.0309 0.0325
07:01-08:00, Wed., 11 Oct. 0.0343 0.0301 0.0324
06:01-07:00, Wed., 11 Oct. 0.0343 0.0305 0.0324
05:01-06:00, Wed., 11 Oct. 0.0349 0.0310 0.0328
04:01-05:00, Wed., 11 Oct. 0.0346 0.0307 0.0331
03:01-04:00, Wed., 11 Oct. 0.0356 0.0309 0.0331
02:01-03:00, Wed., 11 Oct. 0.0348 0.0310 0.0324
01:01-02:00, Wed., 11 Oct. 0.0343 0.0300 0.0323
00:01-01:00, Wed., 11 Oct. 0.0352 0.0293 0.0321
23:01-24:00, Tue., 10 Oct. 0.0345 0.0308 0.0321
22:01-23:00, Tue., 10 Oct. 0.0338 0.0308 0.0322
21:01-22:00, Tue., 10 Oct. 0.0338 0.0291 0.0320
20:01-21:00, Tue., 10 Oct. 0.0344 0.0304 0.0322
19:01-20:00, Tue., 10 Oct. 0.0338 0.0299 0.0317
18:01-19:00, Tue., 10 Oct. 0.0334 0.0292 0.0315
17:01-18:00, Tue., 10 Oct. 0.0332 0.0289 0.0314
16:01-17:00, Tue., 10 Oct. 0.0337 0.0300 0.0319
15:01-16:00, Tue., 10 Oct. 0.0341 0.0297 0.0317
14:01-15:00, Tue., 10 Oct. 0.0338 0.0302 0.0317
13:01-14:00, Tue., 10 Oct. 0.0343 0.0298 0.0319
12:01-13:00, Tue., 10 Oct. 0.0338 0.0299 0.0319
11:01-12:00, Tue., 10 Oct. 0.0345 0.0298 0.0317
10:01-11:00, Tue., 10 Oct. 0.0329 0.0293 0.0312
09:01-10:00, Tue., 10 Oct. 0.0342 0.0296 0.0317
08:01-09:00, Tue., 10 Oct. 0.0336 0.0299 0.0318
07:01-08:00, Tue., 10 Oct. 0.0350 0.0303 0.0322
06:01-07:00, Tue., 10 Oct. 0.0342 0.0304 0.0323
05:01-06:00, Tue., 10 Oct. 0.0349 0.0310 0.0326
04:01-05:00, Tue., 10 Oct. 0.0342 0.0308 0.0323
03:01-04:00, Tue., 10 Oct. 0.0335 0.0302 0.0318
02:01-03:00, Tue., 10 Oct. 0.0330 0.0299 0.0314
01:01-02:00, Tue., 10 Oct. 0.0333 0.0296 0.0315
00:01-01:00, Tue., 10 Oct. 0.0333 0.0293 0.0313
23:01-24:00, Mon., 09 Oct. 0.0329 0.0292 0.0314
22:01-23:00, Mon., 09 Oct. 0.0342 0.0290 0.0311
21:01-22:00, Mon., 09 Oct. 0.0337 0.0295 0.0314
20:01-21:00, Mon., 09 Oct. 0.0330 0.0294 0.0311
19:01-20:00, Mon., 09 Oct. 0.0332 0.0295 0.0313
18:01-19:00, Mon., 09 Oct. 0.0327 0.0293 0.0314
17:01-18:00, Mon., 09 Oct. 0.0336 0.0299 0.0316
16:01-17:00, Mon., 09 Oct. 0.0336 0.0289 0.0312
15:01-16:00, Mon., 09 Oct. 0.0333 0.0289 0.0311
14:01-15:00, Mon., 09 Oct. 0.0329 0.0291 0.0308
13:01-14:00, Mon., 09 Oct. 0.0337 0.0293 0.0311
12:01-13:00, Mon., 09 Oct. 0.0326 0.0289 0.0308
11:01-12:00, Mon., 09 Oct. 0.0327 0.0294 0.0309
10:01-11:00, Mon., 09 Oct. 0.0339 0.0293 0.0310
09:01-10:00, Mon., 09 Oct. 0.0329 0.0294 0.0314
08:01-09:00, Mon., 09 Oct. 0.0345 0.0287 0.0314
07:01-08:00, Mon., 09 Oct. 0.0332 0.0297 0.0314
06:01-07:00, Mon., 09 Oct. 0.0330 0.0298 0.0315
05:01-06:00, Mon., 09 Oct. 0.0335 0.0297 0.0316
04:01-05:00, Mon., 09 Oct. 0.0341 0.0295 0.0316
03:01-04:00, Mon., 09 Oct. 0.0337 0.0297 0.0316
02:01-03:00, Mon., 09 Oct. 0.0328 0.0296 0.0312
01:01-02:00, Mon., 09 Oct. 0.0341 0.0301 0.0316
00:01-01:00, Mon., 09 Oct. 0.0332 0.0291 0.0313
23:01-24:00, Sun., 08 Oct. 0.0331 0.0294 0.0312
22:01-23:00, Sun., 08 Oct. 0.0328 0.0295 0.0312
21:01-22:00, Sun., 08 Oct. 0.0333 0.0292 0.0312
20:01-21:00, Sun., 08 Oct. 0.0335 0.0291 0.0312
19:01-20:00, Sun., 08 Oct. 0.0331 0.0291 0.0311
18:01-19:00, Sun., 08 Oct. 0.0326 0.0289 0.0309
17:01-18:00, Sun., 08 Oct. 0.0333 0.0291 0.0312
16:01-17:00, Sun., 08 Oct. 0.0338 0.0292 0.0314
15:01-16:00, Sun., 08 Oct. 0.0337 0.0292 0.0314
14:01-15:00, Sun., 08 Oct. 0.0328 0.0297 0.0312
13:01-14:00, Sun., 08 Oct. 0.0333 0.0293 0.0315
12:01-13:00, Sun., 08 Oct. 0.0336 0.0290 0.0312
11:01-12:00, Sun., 08 Oct. 0.0334 0.0299 0.0315
10:01-11:00, Sun., 08 Oct. 0.0336 0.0294 0.0317
09:01-10:00, Sun., 08 Oct. 0.0333 0.0296 0.0315
08:01-09:00, Sun., 08 Oct. 0.0336 0.0302 0.0320
07:01-08:00, Sun., 08 Oct. 0.0344 0.0298 0.0319
06:01-07:00, Sun., 08 Oct. 0.0335 0.0294 0.0319
05:01-06:00, Sun., 08 Oct. 0.0335 0.0297 0.0313
04:01-05:00, Sun., 08 Oct. 0.0327 0.0294 0.0309
03:01-04:00, Sun., 08 Oct. 0.0335 0.0292 0.0311
02:01-03:00, Sun., 08 Oct. 0.0335 0.0283 0.0312
01:01-02:00, Sun., 08 Oct. 0.0327 0.0296 0.0311
00:01-01:00, Sun., 08 Oct. 0.0331 0.0290 0.0310
23:01-24:00, Sat., 07 Oct. 0.0328 0.0291 0.0310
22:01-23:00, Sat., 07 Oct. 0.0336 0.0296 0.0311
21:01-22:00, Sat., 07 Oct. 0.0334 0.0286 0.0310
20:01-21:00, Sat., 07 Oct. 0.0329 0.0287 0.0307
19:01-20:00, Sat., 07 Oct. 0.0323 0.0290 0.0308
18:01-19:00, Sat., 07 Oct. 0.0329 0.0289 0.0306
17:01-18:00, Sat., 07 Oct. 0.0326 0.0289 0.0306
16:01-17:00, Sat., 07 Oct. 0.0323 0.0289 0.0307
15:01-16:00, Sat., 07 Oct. 0.0327 0.0282 0.0307
14:01-15:00, Sat., 07 Oct. 0.0326 0.0291 0.0310
13:01-14:00, Sat., 07 Oct. 0.0331 0.0297 0.0314
12:01-13:00, Sat., 07 Oct. 0.0342 0.0291 0.0318