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
17:01-18:00, Sat., 13 Dec. 0.0360 0.0325 0.0342
16:01-17:00, Sat., 13 Dec. 0.0361 0.0323 0.0342
15:01-16:00, Sat., 13 Dec. 0.0362 0.0315 0.0341
14:01-15:00, Sat., 13 Dec. 0.0361 0.0315 0.0341
13:01-14:00, Sat., 13 Dec. 0.0373 0.0327 0.0342
12:01-13:00, Sat., 13 Dec. 0.0368 0.0314 0.0342
11:01-12:00, Sat., 13 Dec. 0.0369 0.0320 0.0343
10:01-11:00, Sat., 13 Dec. 0.0370 0.0327 0.0348
09:01-10:00, Sat., 13 Dec. 0.0382 0.0331 0.0356
08:01-09:00, Sat., 13 Dec. 0.0399 0.0337 0.0366
07:01-08:00, Sat., 13 Dec. 0.0386 0.0343 0.0364
06:01-07:00, Sat., 13 Dec. 0.0389 0.0346 0.0369
05:01-06:00, Sat., 13 Dec. 0.0393 0.0351 0.0370
04:01-05:00, Sat., 13 Dec. 0.0374 0.0325 0.0353
03:01-04:00, Sat., 13 Dec. 0.0388 0.0331 0.0357
02:01-03:00, Sat., 13 Dec. 0.0370 0.0326 0.0348
01:01-02:00, Sat., 13 Dec. 0.0369 0.0330 0.0351
00:01-01:00, Sat., 13 Dec. 0.0381 0.0329 0.0346
23:01-24:00, Fri., 12 Dec. 0.0374 0.0325 0.0348
22:01-23:00, Fri., 12 Dec. 0.0366 0.0318 0.0345
21:01-22:00, Fri., 12 Dec. 0.0377 0.0329 0.0349
20:01-21:00, Fri., 12 Dec. 0.0367 0.0319 0.0346
19:01-20:00, Fri., 12 Dec. 0.0370 0.0320 0.0346
18:01-19:00, Fri., 12 Dec. 0.0373 0.0317 0.0345
17:01-18:00, Fri., 12 Dec. 0.0373 0.0316 0.0348
16:01-17:00, Fri., 12 Dec. 0.0367 0.0316 0.0342
15:01-16:00, Fri., 12 Dec. 0.0368 0.0318 0.0342
14:01-15:00, Fri., 12 Dec. 0.0367 0.0315 0.0343
13:01-14:00, Fri., 12 Dec. 0.0370 0.0325 0.0343
12:01-13:00, Fri., 12 Dec. 0.0363 0.0324 0.0342
11:01-12:00, Fri., 12 Dec. 0.0367 0.0321 0.0344
10:01-11:00, Fri., 12 Dec. 0.0375 0.0329 0.0351
09:01-10:00, Fri., 12 Dec. 0.0369 0.0324 0.0352
08:01-09:00, Fri., 12 Dec. 0.0382 0.0323 0.0354
07:01-08:00, Fri., 12 Dec. 0.0381 0.0334 0.0358
06:01-07:00, Fri., 12 Dec. 0.0383 0.0329 0.0355
05:01-06:00, Fri., 12 Dec. 0.0382 0.0329 0.0357
04:01-05:00, Fri., 12 Dec. 0.0388 0.0336 0.0359
03:01-04:00, Fri., 12 Dec. 0.0379 0.0331 0.0358
02:01-03:00, Fri., 12 Dec. 0.0376 0.0332 0.0356
01:01-02:00, Fri., 12 Dec. 0.0404 0.0329 0.0353
00:01-01:00, Fri., 12 Dec. 0.0383 0.0330 0.0355
23:01-24:00, Thu., 11 Dec. 0.0370 0.0326 0.0351
22:01-23:00, Thu., 11 Dec. 0.0379 0.0325 0.0345
21:01-22:00, Thu., 11 Dec. 0.0381 0.0320 0.0346
20:01-21:00, Thu., 11 Dec. 0.0363 0.0317 0.0343
19:01-20:00, Thu., 11 Dec. 0.0369 0.0321 0.0343
18:01-19:00, Thu., 11 Dec. 0.0371 0.0325 0.0347
17:01-18:00, Thu., 11 Dec. 0.0363 0.0311 0.0344
16:01-17:00, Thu., 11 Dec. 0.0363 0.0320 0.0347
15:01-16:00, Thu., 11 Dec. 0.0382 0.0317 0.0346
14:01-15:00, Thu., 11 Dec. 0.0360 0.0311 0.0340
13:01-14:00, Thu., 11 Dec. 0.0360 0.0321 0.0341
12:01-13:00, Thu., 11 Dec. 0.0373 0.0324 0.0349
11:01-12:00, Thu., 11 Dec. 0.0374 0.0331 0.0350
10:01-11:00, Thu., 11 Dec. 0.0377 0.0326 0.0354
09:01-10:00, Thu., 11 Dec. 0.0385 0.0339 0.0359
08:01-09:00, Thu., 11 Dec. 0.0382 0.0343 0.0361
07:01-08:00, Thu., 11 Dec. 0.0384 0.0346 0.0365
06:01-07:00, Thu., 11 Dec. 0.0403 0.0345 0.0367
05:01-06:00, Thu., 11 Dec. 0.0388 0.0349 0.0369
04:01-05:00, Thu., 11 Dec. 0.0402 0.0345 0.0371
03:01-04:00, Thu., 11 Dec. 0.0388 0.0336 0.0362
02:01-03:00, Thu., 11 Dec. 0.0382 0.0339 0.0360
01:01-02:00, Thu., 11 Dec. 0.0382 0.0332 0.0356
00:01-01:00, Thu., 11 Dec. 0.0381 0.0345 0.0361
23:01-24:00, Wed., 10 Dec. 0.0382 0.0329 0.0356
22:01-23:00, Wed., 10 Dec. 0.0381 0.0335 0.0355
21:01-22:00, Wed., 10 Dec. 0.0390 0.0332 0.0357
20:01-21:00, Wed., 10 Dec. 0.0376 0.0332 0.0355
19:01-20:00, Wed., 10 Dec. 0.0374 0.0327 0.0354
18:01-19:00, Wed., 10 Dec. 0.0378 0.0331 0.0350
17:01-18:00, Wed., 10 Dec. 0.0373 0.0323 0.0347
16:01-17:00, Wed., 10 Dec. 0.0374 0.0326 0.0346
15:01-16:00, Wed., 10 Dec. 0.0374 0.0322 0.0347
14:01-15:00, Wed., 10 Dec. 0.0373 0.0331 0.0351
13:01-14:00, Wed., 10 Dec. 0.0372 0.0331 0.0353
12:01-13:00, Wed., 10 Dec. 0.0387 0.0332 0.0354
11:01-12:00, Wed., 10 Dec. 0.0399 0.0332 0.0367
10:01-11:00, Wed., 10 Dec. 0.0393 0.0349 0.0368
09:01-10:00, Wed., 10 Dec. 0.0383 0.0341 0.0362
08:01-09:00, Wed., 10 Dec. 0.0394 0.0343 0.0365
07:01-08:00, Wed., 10 Dec. 0.0388 0.0339 0.0362
06:01-07:00, Wed., 10 Dec. 0.0395 0.0344 0.0367
05:01-06:00, Wed., 10 Dec. 0.0395 0.0345 0.0362
04:01-05:00, Wed., 10 Dec. 0.0374 0.0320 0.0357
03:01-04:00, Wed., 10 Dec. 0.0391 0.0332 0.0357
02:01-03:00, Wed., 10 Dec. 0.0379 0.0335 0.0356
01:01-02:00, Wed., 10 Dec. 0.0381 0.0324 0.0352
00:01-01:00, Wed., 10 Dec. 0.0370 0.0332 0.0350
23:01-24:00, Tue., 09 Dec. 0.0374 0.0325 0.0352
22:01-23:00, Tue., 09 Dec. 0.0370 0.0327 0.0347
21:01-22:00, Tue., 09 Dec. 0.0380 0.0317 0.0348
20:01-21:00, Tue., 09 Dec. 0.0377 0.0316 0.0345
19:01-20:00, Tue., 09 Dec. 0.0372 0.0325 0.0346
18:01-19:00, Tue., 09 Dec. 0.0365 0.0316 0.0346
17:01-18:00, Tue., 09 Dec. 0.0369 0.0323 0.0345
16:01-17:00, Tue., 09 Dec. 0.0369 0.0327 0.0346
15:01-16:00, Tue., 09 Dec. 0.0376 0.0324 0.0347
14:01-15:00, Tue., 09 Dec. 0.0377 0.0327 0.0351
13:01-14:00, Tue., 09 Dec. 0.0380 0.0334 0.0353
12:01-13:00, Tue., 09 Dec. 0.0374 0.0321 0.0351
11:01-12:00, Tue., 09 Dec. 0.0374 0.0332 0.0355
10:01-11:00, Tue., 09 Dec. 0.0395 0.0333 0.0355
09:01-10:00, Tue., 09 Dec. 0.0382 0.0338 0.0355
08:01-09:00, Tue., 09 Dec. 0.0380 0.0332 0.0356
07:01-08:00, Tue., 09 Dec. 0.0374 0.0329 0.0354
06:01-07:00, Tue., 09 Dec. 0.0385 0.0334 0.0357
05:01-06:00, Tue., 09 Dec. 0.0388 0.0339 0.0358
04:01-05:00, Tue., 09 Dec. 0.0375 0.0324 0.0355
03:01-04:00, Tue., 09 Dec. 0.0377 0.0336 0.0358
02:01-03:00, Tue., 09 Dec. 0.0379 0.0334 0.0357
01:01-02:00, Tue., 09 Dec. 0.0371 0.0336 0.0354
00:01-01:00, Tue., 09 Dec. 0.0388 0.0323 0.0352
23:01-24:00, Mon., 08 Dec. 0.0376 0.0322 0.0351
22:01-23:00, Mon., 08 Dec. 0.0377 0.0333 0.0354
21:01-22:00, Mon., 08 Dec. 0.0371 0.0324 0.0349
20:01-21:00, Mon., 08 Dec. 0.0368 0.0312 0.0347
19:01-20:00, Mon., 08 Dec. 0.0369 0.0325 0.0346
18:01-19:00, Mon., 08 Dec. 0.0362 0.0319 0.0345
17:01-18:00, Mon., 08 Dec. 0.0367 0.0324 0.0342
16:01-17:00, Mon., 08 Dec. 0.0365 0.0320 0.0345
15:01-16:00, Mon., 08 Dec. 0.0365 0.0322 0.0346
14:01-15:00, Mon., 08 Dec. 0.0370 0.0322 0.0346
13:01-14:00, Mon., 08 Dec. 0.0370 0.0326 0.0345
12:01-13:00, Mon., 08 Dec. 0.0371 0.0322 0.0344
11:01-12:00, Mon., 08 Dec. 0.0364 0.0324 0.0347
10:01-11:00, Mon., 08 Dec. 0.0375 0.0315 0.0348
09:01-10:00, Mon., 08 Dec. 0.0377 0.0317 0.0348
08:01-09:00, Mon., 08 Dec. 0.0371 0.0336 0.0351
07:01-08:00, Mon., 08 Dec. 0.0375 0.0328 0.0355
06:01-07:00, Mon., 08 Dec. 0.0379 0.0333 0.0355
05:01-06:00, Mon., 08 Dec. 0.0371 0.0330 0.0355
04:01-05:00, Mon., 08 Dec. 0.0383 0.0329 0.0356
03:01-04:00, Mon., 08 Dec. 0.0384 0.0337 0.0359
02:01-03:00, Mon., 08 Dec. 0.0385 0.0334 0.0361
01:01-02:00, Mon., 08 Dec. 0.0384 0.0336 0.0359
00:01-01:00, Mon., 08 Dec. 0.0388 0.0332 0.0354
23:01-24:00, Sun., 07 Dec. 0.0380 0.0324 0.0350
22:01-23:00, Sun., 07 Dec. 0.0374 0.0322 0.0348
21:01-22:00, Sun., 07 Dec. 0.0371 0.0321 0.0345
20:01-21:00, Sun., 07 Dec. 0.0360 0.0319 0.0345
19:01-20:00, Sun., 07 Dec. 0.0374 0.0325 0.0346
18:01-19:00, Sun., 07 Dec. 0.0365 0.0309 0.0344
17:01-18:00, Sun., 07 Dec. 0.0369 0.0309 0.0341
16:01-17:00, Sun., 07 Dec. 0.0364 0.0320 0.0341
15:01-16:00, Sun., 07 Dec. 0.0368 0.0324 0.0341
14:01-15:00, Sun., 07 Dec. 0.0366 0.0329 0.0346
13:01-14:00, Sun., 07 Dec. 0.0381 0.0325 0.0349
12:01-13:00, Sun., 07 Dec. 0.0375 0.0322 0.0344
11:01-12:00, Sun., 07 Dec. 0.0377 0.0325 0.0349
10:01-11:00, Sun., 07 Dec. 0.0380 0.0331 0.0352
09:01-10:00, Sun., 07 Dec. 0.0380 0.0328 0.0359
08:01-09:00, Sun., 07 Dec. 0.0381 0.0338 0.0361
07:01-08:00, Sun., 07 Dec. 0.0380 0.0334 0.0360
06:01-07:00, Sun., 07 Dec. 0.0389 0.0343 0.0363
05:01-06:00, Sun., 07 Dec. 0.0389 0.0332 0.0363
04:01-05:00, Sun., 07 Dec. 0.0389 0.0339 0.0362
03:01-04:00, Sun., 07 Dec. 0.0385 0.0337 0.0361
02:01-03:00, Sun., 07 Dec. 0.0382 0.0333 0.0360
01:01-02:00, Sun., 07 Dec. 0.0387 0.0334 0.0362
00:01-01:00, Sun., 07 Dec. 0.0387 0.0336 0.0361
23:01-24:00, Sat., 06 Dec. 0.0381 0.0338 0.0358
22:01-23:00, Sat., 06 Dec. 0.0381 0.0339 0.0359
21:01-22:00, Sat., 06 Dec. 0.0388 0.0337 0.0359
20:01-21:00, Sat., 06 Dec. 0.0376 0.0332 0.0357
19:01-20:00, Sat., 06 Dec. 0.0372 0.0322 0.0352
18:01-19:00, Sat., 06 Dec. 0.0380 0.0322 0.0351
17:01-18:00, Sat., 06 Dec. 0.0365 0.0327 0.0347
16:01-17:00, Sat., 06 Dec. 0.0373 0.0318 0.0348
15:01-16:00, Sat., 06 Dec. 0.0369 0.0326 0.0347
14:01-15:00, Sat., 06 Dec. 0.0367 0.0323 0.0347
13:01-14:00, Sat., 06 Dec. 0.0366 0.0325 0.0346
12:01-13:00, Sat., 06 Dec. 0.0376 0.0332 0.0351
11:01-12:00, Sat., 06 Dec. 0.0383 0.0332 0.0353
10:01-11:00, Sat., 06 Dec. 0.0391 0.0339 0.0360
09:01-10:00, Sat., 06 Dec. 0.0402 0.0339 0.0376
08:01-09:00, Sat., 06 Dec. 0.0407 0.0358 0.0378
07:01-08:00, Sat., 06 Dec. 0.0400 0.0336 0.0371
06:01-07:00, Sat., 06 Dec. 0.0388 0.0345 0.0364
05:01-06:00, Sat., 06 Dec. 0.0395 0.0337 0.0359
04:01-05:00, Sat., 06 Dec. 0.0383 0.0336 0.0361
03:01-04:00, Sat., 06 Dec. 0.0388 0.0343 0.0366
02:01-03:00, Sat., 06 Dec. 0.0385 0.0348 0.0367
01:01-02:00, Sat., 06 Dec. 0.0384 0.0335 0.0363
00:01-01:00, Sat., 06 Dec. 0.0380 0.0336 0.0360
23:01-24:00, Fri., 05 Dec. 0.0379 0.0336 0.0360
22:01-23:00, Fri., 05 Dec. 0.0385 0.0331 0.0359
21:01-22:00, Fri., 05 Dec. 0.0375 0.0331 0.0352
20:01-21:00, Fri., 05 Dec. 0.0364 0.0313 0.0347
19:01-20:00, Fri., 05 Dec. 0.0391 0.0329 0.0347
18:01-19:00, Fri., 05 Dec. 0.0376 0.0320 0.0345
17:01-18:00, Fri., 05 Dec. 0.0372 0.0325 0.0348
16:01-17:00, Fri., 05 Dec. 0.0375 0.0320 0.0352
15:01-16:00, Fri., 05 Dec. 0.0374 0.0328 0.0352
14:01-15:00, Fri., 05 Dec. 0.0377 0.0318 0.0349
13:01-14:00, Fri., 05 Dec. 0.0374 0.0322 0.0350
12:01-13:00, Fri., 05 Dec. 0.0380 0.0329 0.0353
11:01-12:00, Fri., 05 Dec. 0.0374 0.0331 0.0351
10:01-11:00, Fri., 05 Dec. 0.0371 0.0332 0.0351
09:01-10:00, Fri., 05 Dec. 0.0376 0.0340 0.0354
08:01-09:00, Fri., 05 Dec. 0.0386 0.0336 0.0359
07:01-08:00, Fri., 05 Dec. 0.0388 0.0341 0.0366
06:01-07:00, Fri., 05 Dec. 0.0391 0.0344 0.0368
05:01-06:00, Fri., 05 Dec. 0.0391 0.0351 0.0371
04:01-05:00, Fri., 05 Dec. 0.0391 0.0353 0.0369
03:01-04:00, Fri., 05 Dec. 0.0377 0.0336 0.0357
02:01-03:00, Fri., 05 Dec. 0.0385 0.0335 0.0359
01:01-02:00, Fri., 05 Dec. 0.0377 0.0329 0.0354
00:01-01:00, Fri., 05 Dec. 0.0388 0.0325 0.0358
23:01-24:00, Thu., 04 Dec. 0.0374 0.0338 0.0357
22:01-23:00, Thu., 04 Dec. 0.0378 0.0332 0.0353
21:01-22:00, Thu., 04 Dec. 0.0381 0.0331 0.0351
20:01-21:00, Thu., 04 Dec. 0.0370 0.0322 0.0347
19:01-20:00, Thu., 04 Dec. 0.0381 0.0312 0.0343
18:01-19:00, Thu., 04 Dec. 0.0365 0.0323 0.0341
17:01-18:00, Thu., 04 Dec. 0.0374 0.0329 0.0346
16:01-17:00, Thu., 04 Dec. 0.0368 0.0326 0.0348
15:01-16:00, Thu., 04 Dec. 0.0367 0.0321 0.0345
14:01-15:00, Thu., 04 Dec. 0.0380 0.0328 0.0350
13:01-14:00, Thu., 04 Dec. 0.0374 0.0322 0.0347
12:01-13:00, Thu., 04 Dec. 0.0377 0.0324 0.0351
11:01-12:00, Thu., 04 Dec. 0.0370 0.0328 0.0351
10:01-11:00, Thu., 04 Dec. 0.0375 0.0316 0.0349
09:01-10:00, Thu., 04 Dec. 0.0383 0.0332 0.0354
08:01-09:00, Thu., 04 Dec. 0.0373 0.0327 0.0355
07:01-08:00, Thu., 04 Dec. 0.0381 0.0328 0.0351
06:01-07:00, Thu., 04 Dec. 0.0378 0.0328 0.0351
05:01-06:00, Thu., 04 Dec. 0.0384 0.0325 0.0351
04:01-05:00, Thu., 04 Dec. 0.0377 0.0329 0.0350
03:01-04:00, Thu., 04 Dec. 0.0374 0.0312 0.0345
02:01-03:00, Thu., 04 Dec. 0.0373 0.0326 0.0346
01:01-02:00, Thu., 04 Dec. 0.0381 0.0325 0.0346
00:01-01:00, Thu., 04 Dec. 0.0371 0.0315 0.0342
23:01-24:00, Wed., 03 Dec. 0.0375 0.0322 0.0346
22:01-23:00, Wed., 03 Dec. 0.0377 0.0317 0.0345
21:01-22:00, Wed., 03 Dec. 0.0376 0.0322 0.0346
20:01-21:00, Wed., 03 Dec. 0.0363 0.0325 0.0346
19:01-20:00, Wed., 03 Dec. 0.0371 0.0316 0.0347
18:01-19:00, Wed., 03 Dec. 0.0369 0.0325 0.0350