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.

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
20:01-21:00, Sun., 15 Jun. 0.0365 0.0316 0.0340
19:01-20:00, Sun., 15 Jun. 0.0358 0.0294 0.0333
18:01-19:00, Sun., 15 Jun. 0.0361 0.0311 0.0334
17:01-18:00, Sun., 15 Jun. 0.0357 0.0308 0.0335
16:01-17:00, Sun., 15 Jun. 0.0366 0.0315 0.0335
15:01-16:00, Sun., 15 Jun. 0.0367 0.0318 0.0343
14:01-15:00, Sun., 15 Jun. 0.0368 0.0327 0.0348
13:01-14:00, Sun., 15 Jun. 0.0367 0.0315 0.0344
12:01-13:00, Sun., 15 Jun. 0.0360 0.0311 0.0336
11:01-12:00, Sun., 15 Jun. 0.0361 0.0321 0.0341
10:01-11:00, Sun., 15 Jun. 0.0360 0.0318 0.0341
09:01-10:00, Sun., 15 Jun. 0.0363 0.0319 0.0342
08:01-09:00, Sun., 15 Jun. 0.0371 0.0322 0.0340
07:01-08:00, Sun., 15 Jun. 0.0367 0.0322 0.0342
06:01-07:00, Sun., 15 Jun. 0.0368 0.0316 0.0346
05:01-06:00, Sun., 15 Jun. 0.0387 0.0332 0.0361
04:01-05:00, Sun., 15 Jun. 0.0386 0.0336 0.0359
03:01-04:00, Sun., 15 Jun. 0.0368 0.0319 0.0343
02:01-03:00, Sun., 15 Jun. 0.0374 0.0302 0.0335
01:01-02:00, Sun., 15 Jun. 0.0355 0.0305 0.0333
00:01-01:00, Sun., 15 Jun. 0.0361 0.0317 0.0336
23:01-24:00, Sat., 14 Jun. 0.0378 0.0318 0.0346
22:01-23:00, Sat., 14 Jun. 0.0384 0.0323 0.0356
21:01-22:00, Sat., 14 Jun. 0.0395 0.0340 0.0364
20:01-21:00, Sat., 14 Jun. 0.0399 0.0350 0.0373
19:01-20:00, Sat., 14 Jun. 0.0388 0.0342 0.0361
18:01-19:00, Sat., 14 Jun. 0.0381 0.0332 0.0356
17:01-18:00, Sat., 14 Jun. 0.0370 0.0311 0.0348
16:01-17:00, Sat., 14 Jun. 0.0368 0.0321 0.0342
15:01-16:00, Sat., 14 Jun. 0.0361 0.0325 0.0344
14:01-15:00, Sat., 14 Jun. 0.0374 0.0321 0.0344
13:01-14:00, Sat., 14 Jun. 0.0377 0.0316 0.0342
12:01-13:00, Sat., 14 Jun. 0.0367 0.0323 0.0340
11:01-12:00, Sat., 14 Jun. 0.0367 0.0319 0.0339
10:01-11:00, Sat., 14 Jun. 0.0364 0.0319 0.0341
09:01-10:00, Sat., 14 Jun. 0.0368 0.0322 0.0341
08:01-09:00, Sat., 14 Jun. 0.0358 0.0309 0.0341
07:01-08:00, Sat., 14 Jun. 0.0370 0.0313 0.0341
06:01-07:00, Sat., 14 Jun. 0.0355 0.0317 0.0338
05:01-06:00, Sat., 14 Jun. 0.0356 0.0315 0.0339
04:01-05:00, Sat., 14 Jun. 0.0364 0.0318 0.0340
03:01-04:00, Sat., 14 Jun. 0.0358 0.0304 0.0338
02:01-03:00, Sat., 14 Jun. 0.0369 0.0316 0.0339
01:01-02:00, Sat., 14 Jun. 0.0365 0.0322 0.0342
00:01-01:00, Sat., 14 Jun. 0.0367 0.0321 0.0338
23:01-24:00, Fri., 13 Jun. 0.0356 0.0315 0.0338
22:01-23:00, Fri., 13 Jun. 0.0356 0.0312 0.0337
21:01-22:00, Fri., 13 Jun. 0.0365 0.0313 0.0337
20:01-21:00, Fri., 13 Jun. 0.0362 0.0312 0.0335
19:01-20:00, Fri., 13 Jun. 0.0360 0.0319 0.0341
18:01-19:00, Fri., 13 Jun. 0.0372 0.0321 0.0338
17:01-18:00, Fri., 13 Jun. 0.0364 0.0313 0.0338
16:01-17:00, Fri., 13 Jun. 0.0356 0.0317 0.0339
15:01-16:00, Fri., 13 Jun. 0.0357 0.0309 0.0337
14:01-15:00, Fri., 13 Jun. 0.0367 0.0318 0.0340
13:01-14:00, Fri., 13 Jun. 0.0366 0.0325 0.0340
12:01-13:00, Fri., 13 Jun. 0.0367 0.0323 0.0342
11:01-12:00, Fri., 13 Jun. 0.0369 0.0313 0.0343
10:01-11:00, Fri., 13 Jun. 0.0377 0.0316 0.0343
09:01-10:00, Fri., 13 Jun. 0.0370 0.0323 0.0345
08:01-09:00, Fri., 13 Jun. 0.0370 0.0330 0.0348
07:01-08:00, Fri., 13 Jun. 0.0370 0.0320 0.0345
06:01-07:00, Fri., 13 Jun. 0.0386 0.0329 0.0349
05:01-06:00, Fri., 13 Jun. 0.0388 0.0336 0.0363
04:01-05:00, Fri., 13 Jun. 0.0387 0.0336 0.0361
03:01-04:00, Fri., 13 Jun. 0.0377 0.0316 0.0350
02:01-03:00, Fri., 13 Jun. 0.0360 0.0313 0.0341
01:01-02:00, Fri., 13 Jun. 0.0360 0.0311 0.0336
00:01-01:00, Fri., 13 Jun. 0.0359 0.0318 0.0338
23:01-24:00, Thu., 12 Jun. 0.0355 0.0315 0.0334
22:01-23:00, Thu., 12 Jun. 0.0360 0.0316 0.0337
21:01-22:00, Thu., 12 Jun. 0.0360 0.0318 0.0338
20:01-21:00, Thu., 12 Jun. 0.0366 0.0317 0.0339
19:01-20:00, Thu., 12 Jun. 0.0371 0.0321 0.0339
18:01-19:00, Thu., 12 Jun. 0.0369 0.0314 0.0341
17:01-18:00, Thu., 12 Jun. 0.0364 0.0320 0.0343
16:01-17:00, Thu., 12 Jun. 0.0370 0.0315 0.0342
15:01-16:00, Thu., 12 Jun. 0.0374 0.0318 0.0344
14:01-15:00, Thu., 12 Jun. 0.0368 0.0312 0.0342
13:01-14:00, Thu., 12 Jun. 0.0363 0.0325 0.0342
12:01-13:00, Thu., 12 Jun. 0.0365 0.0319 0.0339
11:01-12:00, Thu., 12 Jun. 0.0364 0.0326 0.0343
10:01-11:00, Thu., 12 Jun. 0.0367 0.0326 0.0347
09:01-10:00, Thu., 12 Jun. 0.0384 0.0322 0.0347
08:01-09:00, Thu., 12 Jun. 0.0374 0.0322 0.0345
07:01-08:00, Thu., 12 Jun. 0.0379 0.0328 0.0351
06:01-07:00, Thu., 12 Jun. 0.0377 0.0334 0.0352
05:01-06:00, Thu., 12 Jun. 0.0368 0.0331 0.0353
04:01-05:00, Thu., 12 Jun. 0.0371 0.0331 0.0351
03:01-04:00, Thu., 12 Jun. 0.0370 0.0325 0.0347
02:01-03:00, Thu., 12 Jun. 0.0367 0.0322 0.0344
01:01-02:00, Thu., 12 Jun. 0.0366 0.0322 0.0343
00:01-01:00, Thu., 12 Jun. 0.0358 0.0317 0.0338
23:01-24:00, Wed., 11 Jun. 0.0362 0.0320 0.0337
22:01-23:00, Wed., 11 Jun. 0.0367 0.0317 0.0335
21:01-22:00, Wed., 11 Jun. 0.0358 0.0308 0.0335
20:01-21:00, Wed., 11 Jun. 0.0365 0.0311 0.0336
19:01-20:00, Wed., 11 Jun. 0.0358 0.0311 0.0335
18:01-19:00, Wed., 11 Jun. 0.0372 0.0316 0.0342
17:01-18:00, Wed., 11 Jun. 0.0391 0.0339 0.0361
16:01-17:00, Wed., 11 Jun. 0.0431 0.0354 0.0395
15:01-16:00, Wed., 11 Jun. 0.0454 0.0404 0.0431
14:01-15:00, Wed., 11 Jun. 0.0426 0.0335 0.0362
13:01-14:00, Wed., 11 Jun. 0.0369 0.0323 0.0344
12:01-13:00, Wed., 11 Jun. 0.0370 0.0324 0.0349
11:01-12:00, Wed., 11 Jun. 0.0373 0.0335 0.0353
10:01-11:00, Wed., 11 Jun. 0.0381 0.0331 0.0352
09:01-10:00, Wed., 11 Jun. 0.0373 0.0315 0.0347
08:01-09:00, Wed., 11 Jun. 0.0391 0.0337 0.0364
07:01-08:00, Wed., 11 Jun. 0.0394 0.0336 0.0361
06:01-07:00, Wed., 11 Jun. 0.0367 0.0323 0.0345
05:01-06:00, Wed., 11 Jun. 0.0369 0.0324 0.0343
04:01-05:00, Wed., 11 Jun. 0.0378 0.0322 0.0346
03:01-04:00, Wed., 11 Jun. 0.0373 0.0317 0.0351
02:01-03:00, Wed., 11 Jun. 0.0374 0.0325 0.0347
01:01-02:00, Wed., 11 Jun. 0.0363 0.0312 0.0341
00:01-01:00, Wed., 11 Jun. 0.0388 0.0318 0.0337
23:01-24:00, Tue., 10 Jun. 0.0367 0.0311 0.0340
22:01-23:00, Tue., 10 Jun. 0.0360 0.0315 0.0336
21:01-22:00, Tue., 10 Jun. 0.0358 0.0308 0.0335
20:01-21:00, Tue., 10 Jun. 0.0363 0.0302 0.0336
19:01-20:00, Tue., 10 Jun. 0.0356 0.0304 0.0333
18:01-19:00, Tue., 10 Jun. 0.0360 0.0313 0.0333
17:01-18:00, Tue., 10 Jun. 0.0360 0.0313 0.0334
16:01-17:00, Tue., 10 Jun. 0.0359 0.0314 0.0335
15:01-16:00, Tue., 10 Jun. 0.0370 0.0322 0.0340
14:01-15:00, Tue., 10 Jun. 0.0377 0.0322 0.0352
13:01-14:00, Tue., 10 Jun. 0.0391 0.0340 0.0363
12:01-13:00, Tue., 10 Jun. 0.0370 0.0323 0.0347
11:01-12:00, Tue., 10 Jun. 0.0369 0.0329 0.0351
10:01-11:00, Tue., 10 Jun. 0.0384 0.0336 0.0360
09:01-10:00, Tue., 10 Jun. 0.0424 0.0349 0.0388
08:01-09:00, Tue., 10 Jun. 0.0424 0.0353 0.0388
07:01-08:00, Tue., 10 Jun. 0.0427 0.0353 0.0386
06:01-07:00, Tue., 10 Jun. 0.0428 0.0355 0.0395
05:01-06:00, Tue., 10 Jun. 0.0382 0.0330 0.0359
04:01-05:00, Tue., 10 Jun. 0.0384 0.0337 0.0360
03:01-04:00, Tue., 10 Jun. 0.0386 0.0331 0.0357
02:01-03:00, Tue., 10 Jun. 0.0375 0.0309 0.0343
01:01-02:00, Tue., 10 Jun. 0.0363 0.0324 0.0341
00:01-01:00, Tue., 10 Jun. 0.0363 0.0315 0.0338
23:01-24:00, Mon., 09 Jun. 0.0356 0.0311 0.0336
22:01-23:00, Mon., 09 Jun. 0.0370 0.0321 0.0343
21:01-22:00, Mon., 09 Jun. 0.0381 0.0326 0.0355
20:01-21:00, Mon., 09 Jun. 0.0375 0.0317 0.0349
19:01-20:00, Mon., 09 Jun. 0.0377 0.0327 0.0347
18:01-19:00, Mon., 09 Jun. 0.0384 0.0337 0.0358
17:01-18:00, Mon., 09 Jun. 0.0382 0.0327 0.0360
16:01-17:00, Mon., 09 Jun. 0.0374 0.0322 0.0348
15:01-16:00, Mon., 09 Jun. 0.0366 0.0316 0.0340
14:01-15:00, Mon., 09 Jun. 0.0367 0.0315 0.0339
13:01-14:00, Mon., 09 Jun. 0.0362 0.0315 0.0338
12:01-13:00, Mon., 09 Jun. 0.0374 0.0318 0.0342
11:01-12:00, Mon., 09 Jun. 0.0365 0.0319 0.0344
10:01-11:00, Mon., 09 Jun. 0.0374 0.0320 0.0352
09:01-10:00, Mon., 09 Jun. 0.0391 0.0326 0.0356
08:01-09:00, Mon., 09 Jun. 0.0405 0.0342 0.0367
07:01-08:00, Mon., 09 Jun. 0.0383 0.0339 0.0361
06:01-07:00, Mon., 09 Jun. 0.0389 0.0336 0.0364
05:01-06:00, Mon., 09 Jun. 0.0387 0.0343 0.0366
04:01-05:00, Mon., 09 Jun. 0.0388 0.0343 0.0364
03:01-04:00, Mon., 09 Jun. 0.0380 0.0346 0.0364
02:01-03:00, Mon., 09 Jun. 0.0392 0.0337 0.0367
01:01-02:00, Mon., 09 Jun. 0.0389 0.0346 0.0366
00:01-01:00, Mon., 09 Jun. 0.0381 0.0325 0.0351
23:01-24:00, Sun., 08 Jun. 0.0373 0.0318 0.0344
22:01-23:00, Sun., 08 Jun. 0.0369 0.0315 0.0345
21:01-22:00, Sun., 08 Jun. 0.0377 0.0325 0.0345
20:01-21:00, Sun., 08 Jun. 0.0363 0.0323 0.0344
19:01-20:00, Sun., 08 Jun. 0.0367 0.0315 0.0341
18:01-19:00, Sun., 08 Jun. 0.0363 0.0311 0.0341
17:01-18:00, Sun., 08 Jun. 0.0367 0.0319 0.0339
16:01-17:00, Sun., 08 Jun. 0.0369 0.0313 0.0340
15:01-16:00, Sun., 08 Jun. 0.0371 0.0314 0.0341
14:01-15:00, Sun., 08 Jun. 0.0362 0.0311 0.0339
13:01-14:00, Sun., 08 Jun. 0.0359 0.0321 0.0341
12:01-13:00, Sun., 08 Jun. 0.0363 0.0324 0.0344
11:01-12:00, Sun., 08 Jun. 0.0359 0.0315 0.0339
10:01-11:00, Sun., 08 Jun. 0.0372 0.0322 0.0341
09:01-10:00, Sun., 08 Jun. 0.0377 0.0318 0.0351
08:01-09:00, Sun., 08 Jun. 0.0389 0.0332 0.0356
07:01-08:00, Sun., 08 Jun. 0.0382 0.0336 0.0356
06:01-07:00, Sun., 08 Jun. 0.0382 0.0336 0.0359
05:01-06:00, Sun., 08 Jun. 0.0389 0.0342 0.0365
04:01-05:00, Sun., 08 Jun. 0.0402 0.0350 0.0374
03:01-04:00, Sun., 08 Jun. 0.0381 0.0332 0.0357
02:01-03:00, Sun., 08 Jun. 0.0384 0.0336 0.0361
01:01-02:00, Sun., 08 Jun. 0.0379 0.0311 0.0347
00:01-01:00, Sun., 08 Jun. 0.0351 0.0308 0.0333
23:01-24:00, Sat., 07 Jun. 0.0360 0.0309 0.0335
22:01-23:00, Sat., 07 Jun. 0.0359 0.0311 0.0337
21:01-22:00, Sat., 07 Jun. 0.0368 0.0315 0.0336
20:01-21:00, Sat., 07 Jun. 0.0358 0.0313 0.0336
19:01-20:00, Sat., 07 Jun. 0.0357 0.0309 0.0336
18:01-19:00, Sat., 07 Jun. 0.0357 0.0315 0.0335
17:01-18:00, Sat., 07 Jun. 0.0364 0.0313 0.0335
16:01-17:00, Sat., 07 Jun. 0.0358 0.0316 0.0338
15:01-16:00, Sat., 07 Jun. 0.0362 0.0315 0.0337
14:01-15:00, Sat., 07 Jun. 0.0360 0.0315 0.0334
13:01-14:00, Sat., 07 Jun. 0.0356 0.0309 0.0333
12:01-13:00, Sat., 07 Jun. 0.0358 0.0311 0.0335
11:01-12:00, Sat., 07 Jun. 0.0354 0.0297 0.0336
10:01-11:00, Sat., 07 Jun. 0.0360 0.0323 0.0340
09:01-10:00, Sat., 07 Jun. 0.0365 0.0318 0.0341
08:01-09:00, Sat., 07 Jun. 0.0364 0.0323 0.0344
07:01-08:00, Sat., 07 Jun. 0.0356 0.0315 0.0338
06:01-07:00, Sat., 07 Jun. 0.0363 0.0315 0.0344
05:01-06:00, Sat., 07 Jun. 0.0366 0.0318 0.0343
04:01-05:00, Sat., 07 Jun. 0.0362 0.0315 0.0337
03:01-04:00, Sat., 07 Jun. 0.0367 0.0309 0.0337
02:01-03:00, Sat., 07 Jun. 0.0365 0.0317 0.0337
01:01-02:00, Sat., 07 Jun. 0.0359 0.0313 0.0336
00:01-01:00, Sat., 07 Jun. 0.0355 0.0311 0.0336
23:01-24:00, Fri., 06 Jun. 0.0359 0.0309 0.0335
22:01-23:00, Fri., 06 Jun. 0.0358 0.0315 0.0338
21:01-22:00, Fri., 06 Jun. 0.0365 0.0312 0.0337
20:01-21:00, Fri., 06 Jun. 0.0370 0.0320 0.0338
19:01-20:00, Fri., 06 Jun. 0.0362 0.0301 0.0336
18:01-19:00, Fri., 06 Jun. 0.0358 0.0308 0.0336
17:01-18:00, Fri., 06 Jun. 0.0367 0.0315 0.0335
16:01-17:00, Fri., 06 Jun. 0.0357 0.0320 0.0336
15:01-16:00, Fri., 06 Jun. 0.0368 0.0315 0.0338
14:01-15:00, Fri., 06 Jun. 0.0363 0.0319 0.0337
13:01-14:00, Fri., 06 Jun. 0.0358 0.0314 0.0338
12:01-13:00, Fri., 06 Jun. 0.0361 0.0315 0.0338
11:01-12:00, Fri., 06 Jun. 0.0362 0.0308 0.0338
10:01-11:00, Fri., 06 Jun. 0.0362 0.0320 0.0340
09:01-10:00, Fri., 06 Jun. 0.0363 0.0315 0.0343
08:01-09:00, Fri., 06 Jun. 0.0368 0.0316 0.0345
07:01-08:00, Fri., 06 Jun. 0.0371 0.0327 0.0348
06:01-07:00, Fri., 06 Jun. 0.0376 0.0327 0.0349
05:01-06:00, Fri., 06 Jun. 0.0373 0.0325 0.0351
04:01-05:00, Fri., 06 Jun. 0.0377 0.0322 0.0348
03:01-04:00, Fri., 06 Jun. 0.0384 0.0318 0.0349
02:01-03:00, Fri., 06 Jun. 0.0374 0.0330 0.0347
01:01-02:00, Fri., 06 Jun. 0.0376 0.0331 0.0351
00:01-01:00, Fri., 06 Jun. 0.0368 0.0323 0.0346
23:01-24:00, Thu., 05 Jun. 0.0360 0.0318 0.0343
22:01-23:00, Thu., 05 Jun. 0.0365 0.0317 0.0342
21:01-22:00, Thu., 05 Jun. 0.0367 0.0318 0.0337