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

〇Temporary suspension of the monitoring post (Hachioji station) (October 27th, December 22nd)
Due to a power outage caused by facility equipment inspection, the monitoring post (Hachioji station) will suspend measurements on the following dates and times.
1. Sunday, October 27th, 2024, from around 7:00 a.m. to around 2:00 p.m.
2. Sunday, December 22nd, 2024, from around 7:00 a.m. to around 7:00 p.m.

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
10:01-11:00, Sun., 22 Dec. 0.0382 0.0319 0.0350
09:01-10:00, Sun., 22 Dec. 0.0366 0.0321 0.0346
08:01-09:00, Sun., 22 Dec. 0.0370 0.0327 0.0349
07:01-08:00, Sun., 22 Dec. 0.0372 0.0328 0.0347
06:01-07:00, Sun., 22 Dec. 0.0377 0.0331 0.0352
05:01-06:00, Sun., 22 Dec. 0.0382 0.0336 0.0355
04:01-05:00, Sun., 22 Dec. 0.0373 0.0314 0.0354
03:01-04:00, Sun., 22 Dec. 0.0388 0.0343 0.0361
02:01-03:00, Sun., 22 Dec. 0.0384 0.0326 0.0354
01:01-02:00, Sun., 22 Dec. 0.0377 0.0327 0.0348
00:01-01:00, Sun., 22 Dec. 0.0371 0.0324 0.0349
23:01-24:00, Sat., 21 Dec. 0.0368 0.0310 0.0341
22:01-23:00, Sat., 21 Dec. 0.0367 0.0314 0.0344
21:01-22:00, Sat., 21 Dec. 0.0366 0.0318 0.0338
20:01-21:00, Sat., 21 Dec. 0.0361 0.0313 0.0340
19:01-20:00, Sat., 21 Dec. 0.0363 0.0314 0.0338
18:01-19:00, Sat., 21 Dec. 0.0363 0.0318 0.0340
17:01-18:00, Sat., 21 Dec. 0.0370 0.0315 0.0340
16:01-17:00, Sat., 21 Dec. 0.0366 0.0311 0.0336
15:01-16:00, Sat., 21 Dec. 0.0364 0.0313 0.0337
14:01-15:00, Sat., 21 Dec. 0.0360 0.0320 0.0338
13:01-14:00, Sat., 21 Dec. 0.0368 0.0317 0.0339
12:01-13:00, Sat., 21 Dec. 0.0357 0.0314 0.0339
11:01-12:00, Sat., 21 Dec. 0.0363 0.0322 0.0341
10:01-11:00, Sat., 21 Dec. 0.0365 0.0316 0.0344
09:01-10:00, Sat., 21 Dec. 0.0379 0.0315 0.0349
08:01-09:00, Sat., 21 Dec. 0.0379 0.0326 0.0352
07:01-08:00, Sat., 21 Dec. 0.0370 0.0318 0.0350
06:01-07:00, Sat., 21 Dec. 0.0378 0.0322 0.0353
05:01-06:00, Sat., 21 Dec. 0.0379 0.0336 0.0358
04:01-05:00, Sat., 21 Dec. 0.0394 0.0328 0.0364
03:01-04:00, Sat., 21 Dec. 0.0383 0.0337 0.0362
02:01-03:00, Sat., 21 Dec. 0.0374 0.0318 0.0354
01:01-02:00, Sat., 21 Dec. 0.0376 0.0332 0.0352
00:01-01:00, Sat., 21 Dec. 0.0390 0.0329 0.0356
23:01-24:00, Fri., 20 Dec. 0.0379 0.0326 0.0352
22:01-23:00, Fri., 20 Dec. 0.0374 0.0328 0.0351
21:01-22:00, Fri., 20 Dec. 0.0384 0.0325 0.0353
20:01-21:00, Fri., 20 Dec. 0.0376 0.0322 0.0348
19:01-20:00, Fri., 20 Dec. 0.0372 0.0318 0.0346
18:01-19:00, Fri., 20 Dec. 0.0363 0.0326 0.0343
17:01-18:00, Fri., 20 Dec. 0.0359 0.0322 0.0339
16:01-17:00, Fri., 20 Dec. 0.0361 0.0314 0.0337
15:01-16:00, Fri., 20 Dec. 0.0360 0.0308 0.0336
14:01-15:00, Fri., 20 Dec. 0.0360 0.0299 0.0336
13:01-14:00, Fri., 20 Dec. 0.0366 0.0315 0.0336
12:01-13:00, Fri., 20 Dec. 0.0364 0.0319 0.0340
11:01-12:00, Fri., 20 Dec. 0.0375 0.0314 0.0339
10:01-11:00, Fri., 20 Dec. 0.0374 0.0314 0.0343
09:01-10:00, Fri., 20 Dec. 0.0376 0.0322 0.0348
08:01-09:00, Fri., 20 Dec. 0.0372 0.0315 0.0347
07:01-08:00, Fri., 20 Dec. 0.0374 0.0318 0.0348
06:01-07:00, Fri., 20 Dec. 0.0368 0.0327 0.0345
05:01-06:00, Fri., 20 Dec. 0.0370 0.0324 0.0345
04:01-05:00, Fri., 20 Dec. 0.0366 0.0331 0.0348
03:01-04:00, Fri., 20 Dec. 0.0381 0.0332 0.0350
02:01-03:00, Fri., 20 Dec. 0.0371 0.0313 0.0346
01:01-02:00, Fri., 20 Dec. 0.0381 0.0325 0.0344
00:01-01:00, Fri., 20 Dec. 0.0373 0.0323 0.0342
23:01-24:00, Thu., 19 Dec. 0.0360 0.0318 0.0343
22:01-23:00, Thu., 19 Dec. 0.0359 0.0318 0.0342
21:01-22:00, Thu., 19 Dec. 0.0370 0.0313 0.0343
20:01-21:00, Thu., 19 Dec. 0.0355 0.0322 0.0341
19:01-20:00, Thu., 19 Dec. 0.0372 0.0319 0.0342
18:01-19:00, Thu., 19 Dec. 0.0362 0.0323 0.0344
17:01-18:00, Thu., 19 Dec. 0.0382 0.0318 0.0344
16:01-17:00, Thu., 19 Dec. 0.0371 0.0315 0.0343
15:01-16:00, Thu., 19 Dec. 0.0376 0.0317 0.0345
14:01-15:00, Thu., 19 Dec. 0.0367 0.0323 0.0344
13:01-14:00, Thu., 19 Dec. 0.0365 0.0315 0.0344
12:01-13:00, Thu., 19 Dec. 0.0367 0.0325 0.0349
11:01-12:00, Thu., 19 Dec. 0.0371 0.0327 0.0349
10:01-11:00, Thu., 19 Dec. 0.0372 0.0320 0.0346
09:01-10:00, Thu., 19 Dec. 0.0386 0.0325 0.0350
08:01-09:00, Thu., 19 Dec. 0.0383 0.0329 0.0349
07:01-08:00, Thu., 19 Dec. 0.0385 0.0329 0.0353
06:01-07:00, Thu., 19 Dec. 0.0384 0.0327 0.0353
05:01-06:00, Thu., 19 Dec. 0.0379 0.0331 0.0353
04:01-05:00, Thu., 19 Dec. 0.0378 0.0317 0.0349
03:01-04:00, Thu., 19 Dec. 0.0382 0.0336 0.0358
02:01-03:00, Thu., 19 Dec. 0.0374 0.0336 0.0353
01:01-02:00, Thu., 19 Dec. 0.0375 0.0334 0.0353
00:01-01:00, Thu., 19 Dec. 0.0377 0.0327 0.0354
23:01-24:00, Wed., 18 Dec. 0.0380 0.0333 0.0352
22:01-23:00, Wed., 18 Dec. 0.0371 0.0324 0.0347
21:01-22:00, Wed., 18 Dec. 0.0371 0.0318 0.0344
20:01-21:00, Wed., 18 Dec. 0.0363 0.0323 0.0344
19:01-20:00, Wed., 18 Dec. 0.0370 0.0322 0.0346
18:01-19:00, Wed., 18 Dec. 0.0371 0.0324 0.0344
17:01-18:00, Wed., 18 Dec. 0.0365 0.0314 0.0344
16:01-17:00, Wed., 18 Dec. 0.0370 0.0317 0.0344
15:01-16:00, Wed., 18 Dec. 0.0377 0.0320 0.0345
14:01-15:00, Wed., 18 Dec. 0.0362 0.0324 0.0345
13:01-14:00, Wed., 18 Dec. 0.0371 0.0323 0.0345
12:01-13:00, Wed., 18 Dec. 0.0370 0.0319 0.0350
11:01-12:00, Wed., 18 Dec. 0.0372 0.0327 0.0353
10:01-11:00, Wed., 18 Dec. 0.0384 0.0327 0.0358
09:01-10:00, Wed., 18 Dec. 0.0378 0.0330 0.0350
08:01-09:00, Wed., 18 Dec. 0.0377 0.0328 0.0351
07:01-08:00, Wed., 18 Dec. 0.0381 0.0331 0.0353
06:01-07:00, Wed., 18 Dec. 0.0388 0.0334 0.0354
05:01-06:00, Wed., 18 Dec. 0.0387 0.0332 0.0355
04:01-05:00, Wed., 18 Dec. 0.0381 0.0334 0.0356
03:01-04:00, Wed., 18 Dec. 0.0376 0.0335 0.0355
02:01-03:00, Wed., 18 Dec. 0.0381 0.0331 0.0353
01:01-02:00, Wed., 18 Dec. 0.0386 0.0319 0.0354
00:01-01:00, Wed., 18 Dec. 0.0376 0.0326 0.0355
23:01-24:00, Tue., 17 Dec. 0.0379 0.0332 0.0353
22:01-23:00, Tue., 17 Dec. 0.0369 0.0325 0.0349
21:01-22:00, Tue., 17 Dec. 0.0368 0.0323 0.0348
20:01-21:00, Tue., 17 Dec. 0.0370 0.0327 0.0343
19:01-20:00, Tue., 17 Dec. 0.0358 0.0318 0.0341
18:01-19:00, Tue., 17 Dec. 0.0370 0.0318 0.0340
17:01-18:00, Tue., 17 Dec. 0.0364 0.0321 0.0339
16:01-17:00, Tue., 17 Dec. 0.0368 0.0313 0.0344
15:01-16:00, Tue., 17 Dec. 0.0361 0.0309 0.0340
14:01-15:00, Tue., 17 Dec. 0.0368 0.0315 0.0342
13:01-14:00, Tue., 17 Dec. 0.0377 0.0326 0.0348
12:01-13:00, Tue., 17 Dec. 0.0382 0.0320 0.0346
11:01-12:00, Tue., 17 Dec. 0.0381 0.0327 0.0347
10:01-11:00, Tue., 17 Dec. 0.0377 0.0317 0.0354
09:01-10:00, Tue., 17 Dec. 0.0387 0.0343 0.0360
08:01-09:00, Tue., 17 Dec. 0.0374 0.0331 0.0353
07:01-08:00, Tue., 17 Dec. 0.0377 0.0339 0.0354
06:01-07:00, Tue., 17 Dec. 0.0377 0.0336 0.0354
05:01-06:00, Tue., 17 Dec. 0.0385 0.0336 0.0358
04:01-05:00, Tue., 17 Dec. 0.0378 0.0330 0.0360
03:01-04:00, Tue., 17 Dec. 0.0383 0.0329 0.0358
02:01-03:00, Tue., 17 Dec. 0.0379 0.0342 0.0362
01:01-02:00, Tue., 17 Dec. 0.0403 0.0339 0.0364
00:01-01:00, Tue., 17 Dec. 0.0383 0.0336 0.0365
23:01-24:00, Mon., 16 Dec. 0.0388 0.0335 0.0362
22:01-23:00, Mon., 16 Dec. 0.0391 0.0337 0.0357
21:01-22:00, Mon., 16 Dec. 0.0370 0.0329 0.0349
20:01-21:00, Mon., 16 Dec. 0.0377 0.0330 0.0349
19:01-20:00, Mon., 16 Dec. 0.0375 0.0325 0.0349
18:01-19:00, Mon., 16 Dec. 0.0361 0.0324 0.0343
17:01-18:00, Mon., 16 Dec. 0.0364 0.0318 0.0341
16:01-17:00, Mon., 16 Dec. 0.0374 0.0320 0.0345
15:01-16:00, Mon., 16 Dec. 0.0365 0.0313 0.0341
14:01-15:00, Mon., 16 Dec. 0.0361 0.0322 0.0344
13:01-14:00, Mon., 16 Dec. 0.0368 0.0320 0.0346
12:01-13:00, Mon., 16 Dec. 0.0370 0.0322 0.0349
11:01-12:00, Mon., 16 Dec. 0.0372 0.0328 0.0349
10:01-11:00, Mon., 16 Dec. 0.0374 0.0321 0.0350
09:01-10:00, Mon., 16 Dec. 0.0378 0.0322 0.0353
08:01-09:00, Mon., 16 Dec. 0.0377 0.0329 0.0353
07:01-08:00, Mon., 16 Dec. 0.0376 0.0328 0.0353
06:01-07:00, Mon., 16 Dec. 0.0377 0.0330 0.0357
05:01-06:00, Mon., 16 Dec. 0.0379 0.0332 0.0355
04:01-05:00, Mon., 16 Dec. 0.0377 0.0331 0.0355
03:01-04:00, Mon., 16 Dec. 0.0381 0.0334 0.0354
02:01-03:00, Mon., 16 Dec. 0.0374 0.0326 0.0354
01:01-02:00, Mon., 16 Dec. 0.0381 0.0325 0.0356
00:01-01:00, Mon., 16 Dec. 0.0374 0.0326 0.0350
23:01-24:00, Sun., 15 Dec. 0.0367 0.0325 0.0344
22:01-23:00, Sun., 15 Dec. 0.0361 0.0312 0.0342
21:01-22:00, Sun., 15 Dec. 0.0363 0.0320 0.0340
20:01-21:00, Sun., 15 Dec. 0.0366 0.0311 0.0340
19:01-20:00, Sun., 15 Dec. 0.0360 0.0313 0.0339
18:01-19:00, Sun., 15 Dec. 0.0363 0.0328 0.0344
17:01-18:00, Sun., 15 Dec. 0.0378 0.0325 0.0346
16:01-17:00, Sun., 15 Dec. 0.0367 0.0315 0.0340
15:01-16:00, Sun., 15 Dec. 0.0370 0.0316 0.0343
14:01-15:00, Sun., 15 Dec. 0.0364 0.0305 0.0341
13:01-14:00, Sun., 15 Dec. 0.0370 0.0319 0.0343
12:01-13:00, Sun., 15 Dec. 0.0372 0.0315 0.0344
11:01-12:00, Sun., 15 Dec. 0.0363 0.0322 0.0345
10:01-11:00, Sun., 15 Dec. 0.0372 0.0329 0.0350
09:01-10:00, Sun., 15 Dec. 0.0384 0.0325 0.0352
08:01-09:00, Sun., 15 Dec. 0.0373 0.0331 0.0349
07:01-08:00, Sun., 15 Dec. 0.0369 0.0329 0.0351
06:01-07:00, Sun., 15 Dec. 0.0369 0.0336 0.0351
05:01-06:00, Sun., 15 Dec. 0.0390 0.0330 0.0351
04:01-05:00, Sun., 15 Dec. 0.0386 0.0329 0.0351
03:01-04:00, Sun., 15 Dec. 0.0369 0.0324 0.0349
02:01-03:00, Sun., 15 Dec. 0.0381 0.0327 0.0354
01:01-02:00, Sun., 15 Dec. 0.0384 0.0328 0.0354
00:01-01:00, Sun., 15 Dec. 0.0377 0.0331 0.0353
23:01-24:00, Sat., 14 Dec. 0.0384 0.0323 0.0350
22:01-23:00, Sat., 14 Dec. 0.0367 0.0326 0.0347
21:01-22:00, Sat., 14 Dec. 0.0366 0.0309 0.0345
20:01-21:00, Sat., 14 Dec. 0.0374 0.0317 0.0342
19:01-20:00, Sat., 14 Dec. 0.0367 0.0320 0.0342
18:01-19:00, Sat., 14 Dec. 0.0365 0.0315 0.0339
17:01-18:00, Sat., 14 Dec. 0.0371 0.0322 0.0341
16:01-17:00, Sat., 14 Dec. 0.0364 0.0318 0.0343
15:01-16:00, Sat., 14 Dec. 0.0369 0.0312 0.0344
14:01-15:00, Sat., 14 Dec. 0.0379 0.0317 0.0345
13:01-14:00, Sat., 14 Dec. 0.0372 0.0313 0.0342
12:01-13:00, Sat., 14 Dec. 0.0361 0.0311 0.0340
11:01-12:00, Sat., 14 Dec. 0.0370 0.0305 0.0340
10:01-11:00, Sat., 14 Dec. 0.0366 0.0311 0.0343
09:01-10:00, Sat., 14 Dec. 0.0367 0.0326 0.0345
08:01-09:00, Sat., 14 Dec. 0.0379 0.0325 0.0349
07:01-08:00, Sat., 14 Dec. 0.0370 0.0331 0.0356
06:01-07:00, Sat., 14 Dec. 0.0380 0.0329 0.0357
05:01-06:00, Sat., 14 Dec. 0.0383 0.0332 0.0360
04:01-05:00, Sat., 14 Dec. 0.0400 0.0347 0.0369
03:01-04:00, Sat., 14 Dec. 0.0396 0.0342 0.0373
02:01-03:00, Sat., 14 Dec. 0.0387 0.0339 0.0362
01:01-02:00, Sat., 14 Dec. 0.0398 0.0343 0.0364
00:01-01:00, Sat., 14 Dec. 0.0385 0.0338 0.0362
23:01-24:00, Fri., 13 Dec. 0.0391 0.0339 0.0356
22:01-23:00, Fri., 13 Dec. 0.0372 0.0316 0.0351
21:01-22:00, Fri., 13 Dec. 0.0374 0.0323 0.0349
20:01-21:00, Fri., 13 Dec. 0.0375 0.0329 0.0352
19:01-20:00, Fri., 13 Dec. 0.0383 0.0331 0.0352
18:01-19:00, Fri., 13 Dec. 0.0388 0.0333 0.0353
17:01-18:00, Fri., 13 Dec. 0.0382 0.0322 0.0350
16:01-17:00, Fri., 13 Dec. 0.0381 0.0321 0.0353
15:01-16:00, Fri., 13 Dec. 0.0381 0.0330 0.0352
14:01-15:00, Fri., 13 Dec. 0.0370 0.0330 0.0350
13:01-14:00, Fri., 13 Dec. 0.0365 0.0320 0.0343
12:01-13:00, Fri., 13 Dec. 0.0361 0.0322 0.0343
11:01-12:00, Fri., 13 Dec. 0.0366 0.0322 0.0342
10:01-11:00, Fri., 13 Dec. 0.0371 0.0322 0.0349
09:01-10:00, Fri., 13 Dec. 0.0381 0.0321 0.0351
08:01-09:00, Fri., 13 Dec. 0.0377 0.0330 0.0353
07:01-08:00, Fri., 13 Dec. 0.0386 0.0334 0.0357
06:01-07:00, Fri., 13 Dec. 0.0373 0.0336 0.0353
05:01-06:00, Fri., 13 Dec. 0.0374 0.0334 0.0354
04:01-05:00, Fri., 13 Dec. 0.0377 0.0311 0.0352
03:01-04:00, Fri., 13 Dec. 0.0378 0.0325 0.0354
02:01-03:00, Fri., 13 Dec. 0.0377 0.0335 0.0357
01:01-02:00, Fri., 13 Dec. 0.0385 0.0332 0.0354
00:01-01:00, Fri., 13 Dec. 0.0382 0.0337 0.0361
23:01-24:00, Thu., 12 Dec. 0.0380 0.0322 0.0353
22:01-23:00, Thu., 12 Dec. 0.0367 0.0322 0.0347
21:01-22:00, Thu., 12 Dec. 0.0369 0.0320 0.0345
20:01-21:00, Thu., 12 Dec. 0.0376 0.0320 0.0342
19:01-20:00, Thu., 12 Dec. 0.0367 0.0319 0.0342
18:01-19:00, Thu., 12 Dec. 0.0349 0.0314 0.0335
17:01-18:00, Thu., 12 Dec. 0.0360 0.0311 0.0337
16:01-17:00, Thu., 12 Dec. 0.0363 0.0306 0.0338
15:01-16:00, Thu., 12 Dec. 0.0356 0.0304 0.0337
14:01-15:00, Thu., 12 Dec. 0.0356 0.0308 0.0339
13:01-14:00, Thu., 12 Dec. 0.0367 0.0309 0.0336
12:01-13:00, Thu., 12 Dec. 0.0363 0.0312 0.0341
11:01-12:00, Thu., 12 Dec. 0.0365 0.0318 0.0343