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

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






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 10:00 on Monday, October 23,2017 

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. 0.0371 0.0324 0.0352
10:01-11:00, Tue., 17 Oct. 0.0379 0.0325 0.0353
09:01-10:00, Tue., 17 Oct. 0.0368 0.0326 0.0345
08:01-09:00, Tue., 17 Oct. 0.0371 0.0331 0.0352
07:01-08:00, Tue., 17 Oct. 0.0373 0.0336 0.0355
06:01-07:00, Tue., 17 Oct. 0.0407 0.0332 0.0370
05:01-06:00, Tue., 17 Oct. 0.0433 0.0362 0.0398
04:01-05:00, Tue., 17 Oct. 0.0423 0.0332 0.0363
03:01-04:00, Tue., 17 Oct. 0.0412 0.0326 0.0366
02:01-03:00, Tue., 17 Oct. 0.0410 0.0350 0.0376
01:01-02:00, Tue., 17 Oct. 0.0403 0.0352 0.0368
00:01-01:00, Tue., 17 Oct. 0.0417 0.0346 0.0370
23:01-24:00, Mon., 16 Oct. 0.0405 0.0345 0.0364
22:01-23:00, Mon., 16 Oct. 0.0421 0.0356 0.0378
21:01-22:00, Mon., 16 Oct. 0.0454 0.0367 0.0403
20:01-21:00, Mon., 16 Oct. 0.0445 0.0356 0.0403
19:01-20:00, Mon., 16 Oct. 0.0438 0.0344 0.0390
18:01-19:00, Mon., 16 Oct. 0.0490 0.0395 0.0443
17:01-18:00, Mon., 16 Oct. 0.0509 0.0437 0.0475
16:01-17:00, Mon., 16 Oct. 0.0535 0.0435 0.0474
15:01-16:00, Mon., 16 Oct. 0.0443 0.0363 0.0401
14:01-15:00, Mon., 16 Oct. 0.0435 0.0360 0.0400
13:01-14:00, Mon., 16 Oct. 0.0498 0.0401 0.0440
12:01-13:00, Mon., 16 Oct. 0.0506 0.0386 0.0454
11:01-12:00, Mon., 16 Oct. 0.0496 0.0401 0.0440
10:01-11:00, Mon., 16 Oct. 0.0557 0.0435 0.0492
09:01-10:00, Mon., 16 Oct. 0.0551 0.0465 0.0512
08:01-09:00, Mon., 16 Oct. 0.0576 0.0469 0.0515
07:01-08:00, Mon., 16 Oct. 0.0529 0.0448 0.0485
06:01-07:00, Mon., 16 Oct. 0.0559 0.0435 0.0482
05:01-06:00, Mon., 16 Oct. 0.0514 0.0420 0.0465
04:01-05:00, Mon., 16 Oct. 0.0511 0.0436 0.0476
03:01-04:00, Mon., 16 Oct. 0.0532 0.0440 0.0468
02:01-03:00, Mon., 16 Oct. 0.0514 0.0394 0.0451
01:01-02:00, Mon., 16 Oct. 0.0457 0.0371 0.0414
00:01-01:00, Mon., 16 Oct. 0.0433 0.0357 0.0382
23:01-24:00, Sun., 15 Oct. 0.0426 0.0348 0.0382
22:01-23:00, Sun., 15 Oct. 0.0496 0.0382 0.0440
21:01-22:00, Sun., 15 Oct. 0.0481 0.0366 0.0423
20:01-21:00, Sun., 15 Oct. 0.0412 0.0294 0.0337
19:01-20:00, Sun., 15 Oct. 0.0332 0.0298 0.0315
18:01-19:00, Sun., 15 Oct. 0.0342 0.0302 0.0318
17:01-18:00, Sun., 15 Oct. 0.0334 0.0302 0.0314
16:01-17:00, Sun., 15 Oct. 0.0348 0.0294 0.0320
15:01-16:00, Sun., 15 Oct. 0.0367 0.0307 0.0331
14:01-15:00, Sun., 15 Oct. 0.0351 0.0317 0.0332
13:01-14:00, Sun., 15 Oct. 0.0380 0.0317 0.0345
12:01-13:00, Sun., 15 Oct. 0.0373 0.0329 0.0356
11:01-12:00, Sun., 15 Oct. 0.0371 0.0325 0.0348
10:01-11:00, Sun., 15 Oct. 0.0357 0.0315 0.0335
09:01-10:00, Sun., 15 Oct. 0.0357 0.0308 0.0336
08:01-09:00, Sun., 15 Oct. 0.0365 0.0321 0.0346
07:01-08:00, Sun., 15 Oct. 0.0371 0.0327 0.0350
06:01-07:00, Sun., 15 Oct. 0.0353 0.0296 0.0318
05:01-06:00, Sun., 15 Oct. 0.0332 0.0292 0.0314
04:01-05:00, Sun., 15 Oct. 0.0333 0.0289 0.0311
03:01-04:00, Sun., 15 Oct. 0.0329 0.0289 0.0309
02:01-03:00, Sun., 15 Oct. 0.0329 0.0294 0.0309
01:01-02:00, Sun., 15 Oct. 0.0327 0.0289 0.0308
00:01-01:00, Sun., 15 Oct. 0.0331 0.0285 0.0307
23:01-24:00, Sat., 14 Oct. 0.0329 0.0287 0.0307
22:01-23:00, Sat., 14 Oct. 0.0329 0.0284 0.0307
21:01-22:00, Sat., 14 Oct. 0.0331 0.0285 0.0306
20:01-21:00, Sat., 14 Oct. 0.0323 0.0292 0.0308
19:01-20:00, Sat., 14 Oct. 0.0335 0.0297 0.0316
18:01-19:00, Sat., 14 Oct. 0.0341 0.0295 0.0318
17:01-18:00, Sat., 14 Oct. 0.0336 0.0283 0.0307
16:01-17:00, Sat., 14 Oct. 0.0320 0.0288 0.0306
15:01-16:00, Sat., 14 Oct. 0.0333 0.0277 0.0307
14:01-15:00, Sat., 14 Oct. 0.0334 0.0291 0.0309
13:01-14:00, Sat., 14 Oct. 0.0331 0.0298 0.0312
12:01-13:00, Sat., 14 Oct. 0.0349 0.0307 0.0328
11:01-12:00, Sat., 14 Oct. 0.0365 0.0291 0.0322
10:01-11:00, Sat., 14 Oct. 0.0335 0.0295 0.0316
09:01-10:00, Sat., 14 Oct. 0.0367 0.0310 0.0340
08:01-09:00, Sat., 14 Oct. 0.0415 0.0348 0.0376
07:01-08:00, Sat., 14 Oct. 0.0427 0.0344 0.0386
06:01-07:00, Sat., 14 Oct. 0.0416 0.0333 0.0364
05:01-06:00, Sat., 14 Oct. 0.0498 0.0392 0.0451
04:01-05:00, Sat., 14 Oct. 0.0535 0.0449 0.0484
03:01-04:00, Sat., 14 Oct. 0.0513 0.0405 0.0464
02:01-03:00, Sat., 14 Oct. 0.0488 0.0382 0.0434
01:01-02:00, Sat., 14 Oct. 0.0413 0.0349 0.0375
00:01-01:00, Sat., 14 Oct. 0.0366 0.0306 0.0338
23:01-24:00, Fri., 13 Oct. 0.0350 0.0300 0.0326
22:01-23:00, Fri., 13 Oct. 0.0332 0.0293 0.0312
21:01-22:00, Fri., 13 Oct. 0.0336 0.0293 0.0313
20:01-21:00, Fri., 13 Oct. 0.0330 0.0286 0.0307
19:01-20:00, Fri., 13 Oct. 0.0335 0.0290 0.0315
18:01-19:00, Fri., 13 Oct. 0.0358 0.0306 0.0338
17:01-18:00, Fri., 13 Oct. 0.0381 0.0324 0.0350
16:01-17:00, Fri., 13 Oct. 0.0397 0.0334 0.0365
15:01-16:00, Fri., 13 Oct. 0.0431 0.0353 0.0388
14:01-15:00, Fri., 13 Oct. 0.0519 0.0392 0.0461
13:01-14:00, Fri., 13 Oct. 0.0471 0.0336 0.0392
12:01-13:00, Fri., 13 Oct. 0.0386 0.0321 0.0345
11:01-12:00, Fri., 13 Oct. 0.0405 0.0340 0.0374
10:01-11:00, Fri., 13 Oct. 0.0416 0.0360 0.0388
09:01-10:00, Fri., 13 Oct. 0.0415 0.0348 0.0375
08:01-09:00, Fri., 13 Oct. 0.0443 0.0363 0.0403
07:01-08:00, Fri., 13 Oct. 0.0443 0.0375 0.0403
06:01-07:00, Fri., 13 Oct. 0.0424 0.0342 0.0385
05:01-06:00, Fri., 13 Oct. 0.0399 0.0314 0.0353
04:01-05:00, Fri., 13 Oct. 0.0355 0.0303 0.0323
03:01-04:00, Fri., 13 Oct. 0.0333 0.0291 0.0311
02:01-03:00, Fri., 13 Oct. 0.0331 0.0288 0.0311
01:01-02:00, Fri., 13 Oct. 0.0325 0.0287 0.0308
00:01-01:00, Fri., 13 Oct. 0.0326 0.0291 0.0310
23:01-24:00, Thu., 12 Oct. 0.0336 0.0295 0.0315
22:01-23:00, Thu., 12 Oct. 0.0363 0.0303 0.0332
21:01-22:00, Thu., 12 Oct. 0.0461 0.0334 0.0387
20:01-21:00, Thu., 12 Oct. 0.0453 0.0302 0.0349
19:01-20:00, Thu., 12 Oct. 0.0333 0.0290 0.0313
18:01-19:00, Thu., 12 Oct. 0.0333 0.0290 0.0314
17:01-18:00, Thu., 12 Oct. 0.0336 0.0300 0.0315
16:01-17:00, Thu., 12 Oct. 0.0331 0.0294 0.0314
15:01-16:00, Thu., 12 Oct. 0.0341 0.0294 0.0314
14:01-15:00, Thu., 12 Oct. 0.0345 0.0287 0.0314
13:01-14:00, Thu., 12 Oct. 0.0336 0.0302 0.0317
12:01-13:00, Thu., 12 Oct. 0.0337 0.0297 0.0317
11:01-12:00, Thu., 12 Oct. 0.0341 0.0290 0.0319
10:01-11:00, Thu., 12 Oct. 0.0340 0.0299 0.0320
09:01-10:00, Thu., 12 Oct. 0.0351 0.0303 0.0323
08:01-09:00, Thu., 12 Oct. 0.0349 0.0308 0.0331
07:01-08:00, Thu., 12 Oct. 0.0344 0.0302 0.0321
06:01-07:00, Thu., 12 Oct. 0.0345 0.0302 0.0319
05:01-06:00, Thu., 12 Oct. 0.0337 0.0295 0.0315
04:01-05:00, Thu., 12 Oct. 0.0328 0.0283 0.0311
03:01-04:00, Thu., 12 Oct. 0.0331 0.0294 0.0312
02:01-03:00, Thu., 12 Oct. 0.0333 0.0289 0.0312
01:01-02:00, Thu., 12 Oct. 0.0333 0.0287 0.0310
00:01-01:00, Thu., 12 Oct. 0.0334 0.0288 0.0312
23:01-24:00, Wed., 11 Oct. 0.0331 0.0293 0.0312
22:01-23:00, Wed., 11 Oct. 0.0329 0.0288 0.0311
21:01-22:00, Wed., 11 Oct. 0.0333 0.0293 0.0311
20:01-21:00, Wed., 11 Oct. 0.0322 0.0285 0.0307
19:01-20:00, Wed., 11 Oct. 0.0327 0.0290 0.0310
18:01-19:00, Wed., 11 Oct. 0.0327 0.0292 0.0310
17:01-18:00, Wed., 11 Oct. 0.0327 0.0280 0.0308
16:01-17:00, Wed., 11 Oct. 0.0331 0.0283 0.0311
15:01-16:00, Wed., 11 Oct. 0.0330 0.0288 0.0307
14:01-15:00, Wed., 11 Oct. 0.0327 0.0284 0.0306
13:01-14:00, Wed., 11 Oct. 0.0331 0.0283 0.0310
12:01-13:00, Wed., 11 Oct. 0.0330 0.0293 0.0313
11:01-12:00, Wed., 11 Oct. 0.0335 0.0291 0.0315
10:01-11:00, Wed., 11 Oct. 0.0343 0.0290 0.0311
09:01-10:00, Wed., 11 Oct. 0.0337 0.0290 0.0317
08:01-09:00, Wed., 11 Oct. 0.0348 0.0302 0.0327
07:01-08:00, Wed., 11 Oct. 0.0346 0.0294 0.0321
06:01-07:00, Wed., 11 Oct. 0.0344 0.0302 0.0319
05:01-06:00, Wed., 11 Oct. 0.0342 0.0302 0.0321
04:01-05:00, Wed., 11 Oct. 0.0335 0.0299 0.0315
03:01-04:00, Wed., 11 Oct. 0.0338 0.0293 0.0315
02:01-03:00, Wed., 11 Oct. 0.0329 0.0294 0.0314
01:01-02:00, Wed., 11 Oct. 0.0338 0.0302 0.0318
00:01-01:00, Wed., 11 Oct. 0.0346 0.0305 0.0325
23:01-24:00, Tue., 10 Oct. 0.0349 0.0308 0.0330
22:01-23:00, Tue., 10 Oct. 0.0346 0.0307 0.0324
21:01-22:00, Tue., 10 Oct. 0.0344 0.0305 0.0323
20:01-21:00, Tue., 10 Oct. 0.0337 0.0295 0.0312
19:01-20:00, Tue., 10 Oct. 0.0331 0.0291 0.0310
18:01-19:00, Tue., 10 Oct. 0.0327 0.0293 0.0310
17:01-18:00, Tue., 10 Oct. 0.0330 0.0281 0.0308
16:01-17:00, Tue., 10 Oct. 0.0326 0.0289 0.0310
15:01-16:00, Tue., 10 Oct. 0.0330 0.0284 0.0309
14:01-15:00, Tue., 10 Oct. 0.0340 0.0292 0.0315
13:01-14:00, Tue., 10 Oct. 0.0343 0.0294 0.0313
12:01-13:00, Tue., 10 Oct. 0.0332 0.0290 0.0312
11:01-12:00, Tue., 10 Oct. 0.0333 0.0291 0.0314
10:01-11:00, Tue., 10 Oct. 0.0336 0.0298 0.0319
09:01-10:00, Tue., 10 Oct. 0.0344 0.0304 0.0323
08:01-09:00, Tue., 10 Oct. 0.0355 0.0311 0.0336
07:01-08:00, Tue., 10 Oct. 0.0350 0.0304 0.0333
06:01-07:00, Tue., 10 Oct. 0.0350 0.0312 0.0331
05:01-06:00, Tue., 10 Oct. 0.0349 0.0311 0.0328
04:01-05:00, Tue., 10 Oct. 0.0343 0.0301 0.0319
03:01-04:00, Tue., 10 Oct. 0.0348 0.0298 0.0322
02:01-03:00, Tue., 10 Oct. 0.0347 0.0304 0.0324
01:01-02:00, Tue., 10 Oct. 0.0347 0.0305 0.0325
00:01-01:00, Tue., 10 Oct. 0.0339 0.0285 0.0318
23:01-24:00, Mon., 09 Oct. 0.0324 0.0287 0.0307
22:01-23:00, Mon., 09 Oct. 0.0319 0.0282 0.0300
21:01-22:00, Mon., 09 Oct. 0.0319 0.0285 0.0303
20:01-21:00, Mon., 09 Oct. 0.0328 0.0278 0.0303
19:01-20:00, Mon., 09 Oct. 0.0317 0.0285 0.0301
18:01-19:00, Mon., 09 Oct. 0.0319 0.0280 0.0303
17:01-18:00, Mon., 09 Oct. 0.0321 0.0279 0.0303
16:01-17:00, Mon., 09 Oct. 0.0322 0.0286 0.0303
15:01-16:00, Mon., 09 Oct. 0.0326 0.0287 0.0306
14:01-15:00, Mon., 09 Oct. 0.0324 0.0282 0.0304
13:01-14:00, Mon., 09 Oct. 0.0319 0.0283 0.0302
12:01-13:00, Mon., 09 Oct. 0.0319 0.0280 0.0304
11:01-12:00, Mon., 09 Oct. 0.0330 0.0283 0.0305
10:01-11:00, Mon., 09 Oct. 0.0331 0.0284 0.0304
09:01-10:00, Mon., 09 Oct. 0.0331 0.0287 0.0306
08:01-09:00, Mon., 09 Oct. 0.0323 0.0281 0.0304
07:01-08:00, Mon., 09 Oct. 0.0328 0.0288 0.0304
06:01-07:00, Mon., 09 Oct. 0.0329 0.0280 0.0303
05:01-06:00, Mon., 09 Oct. 0.0328 0.0280 0.0301
04:01-05:00, Mon., 09 Oct. 0.0321 0.0278 0.0302
03:01-04:00, Mon., 09 Oct. 0.0325 0.0284 0.0304
02:01-03:00, Mon., 09 Oct. 0.0320 0.0282 0.0302
01:01-02:00, Mon., 09 Oct. 0.0322 0.0283 0.0302
00:01-01:00, Mon., 09 Oct. 0.0323 0.0279 0.0302
23:01-24:00, Sun., 08 Oct. 0.0323 0.0282 0.0301
22:01-23:00, Sun., 08 Oct. 0.0325 0.0284 0.0303
21:01-22:00, Sun., 08 Oct. 0.0321 0.0277 0.0301
20:01-21:00, Sun., 08 Oct. 0.0321 0.0287 0.0301
19:01-20:00, Sun., 08 Oct. 0.0326 0.0286 0.0303
18:01-19:00, Sun., 08 Oct. 0.0320 0.0284 0.0303
17:01-18:00, Sun., 08 Oct. 0.0326 0.0282 0.0304
16:01-17:00, Sun., 08 Oct. 0.0318 0.0283 0.0302
15:01-16:00, Sun., 08 Oct. 0.0322 0.0288 0.0305
14:01-15:00, Sun., 08 Oct. 0.0319 0.0282 0.0305
13:01-14:00, Sun., 08 Oct. 0.0327 0.0288 0.0306
12:01-13:00, Sun., 08 Oct. 0.0327 0.0283 0.0304
11:01-12:00, Sun., 08 Oct. 0.0324 0.0284 0.0306
10:01-11:00, Sun., 08 Oct. 0.0334 0.0285 0.0311
09:01-10:00, Sun., 08 Oct. 0.0333 0.0283 0.0313
08:01-09:00, Sun., 08 Oct. 0.0325 0.0288 0.0311
07:01-08:00, Sun., 08 Oct. 0.0330 0.0294 0.0313
06:01-07:00, Sun., 08 Oct. 0.0326 0.0288 0.0308
05:01-06:00, Sun., 08 Oct. 0.0331 0.0295 0.0312
04:01-05:00, Sun., 08 Oct. 0.0333 0.0294 0.0312
03:01-04:00, Sun., 08 Oct. 0.0327 0.0292 0.0311
02:01-03:00, Sun., 08 Oct. 0.0344 0.0289 0.0309
01:01-02:00, Sun., 08 Oct. 0.0330 0.0281 0.0310
00:01-01:00, Sun., 08 Oct. 0.0327 0.0295 0.0309
23:01-24:00, Sat., 07 Oct. 0.0328 0.0293 0.0310
22:01-23:00, Sat., 07 Oct. 0.0327 0.0295 0.0312
21:01-22:00, Sat., 07 Oct. 0.0332 0.0284 0.0304
20:01-21:00, Sat., 07 Oct. 0.0330 0.0283 0.0302
19:01-20:00, Sat., 07 Oct. 0.0320 0.0279 0.0298
18:01-19:00, Sat., 07 Oct. 0.0325 0.0274 0.0297
17:01-18:00, Sat., 07 Oct. 0.0316 0.0280 0.0299
16:01-17:00, Sat., 07 Oct. 0.0317 0.0279 0.0300
15:01-16:00, Sat., 07 Oct. 0.0327 0.0279 0.0298
14:01-15:00, Sat., 07 Oct. 0.0317 0.0278 0.0297
13:01-14:00, Sat., 07 Oct. 0.0320 0.0273 0.0299
12:01-13:00, Sat., 07 Oct. 0.0331 0.0281 0.0301