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
10:01-11:00, Wed., 02 Apr. 0.0396 0.0324 0.0359
09:01-10:00, Wed., 02 Apr. 0.0441 0.0358 0.0400
08:01-09:00, Wed., 02 Apr. 0.0424 0.0374 0.0399
07:01-08:00, Wed., 02 Apr. 0.0415 0.0360 0.0391
06:01-07:00, Wed., 02 Apr. 0.0424 0.0370 0.0399
05:01-06:00, Wed., 02 Apr. 0.0454 0.0388 0.0420
04:01-05:00, Wed., 02 Apr. 0.0440 0.0391 0.0419
03:01-04:00, Wed., 02 Apr. 0.0440 0.0388 0.0419
02:01-03:00, Wed., 02 Apr. 0.0454 0.0405 0.0426
01:01-02:00, Wed., 02 Apr. 0.0446 0.0401 0.0426
00:01-01:00, Wed., 02 Apr. 0.0448 0.0390 0.0415
23:01-24:00, Tue., 01 Apr. 0.0441 0.0384 0.0415
22:01-23:00, Tue., 01 Apr. 0.0427 0.0383 0.0405
21:01-22:00, Tue., 01 Apr. 0.0435 0.0383 0.0407
20:01-21:00, Tue., 01 Apr. 0.0433 0.0364 0.0402
19:01-20:00, Tue., 01 Apr. 0.0441 0.0384 0.0412
18:01-19:00, Tue., 01 Apr. 0.0437 0.0379 0.0411
17:01-18:00, Tue., 01 Apr. 0.0450 0.0399 0.0424
16:01-17:00, Tue., 01 Apr. 0.0468 0.0414 0.0438
15:01-16:00, Tue., 01 Apr. 0.0446 0.0355 0.0392
14:01-15:00, Tue., 01 Apr. 0.0414 0.0356 0.0390
13:01-14:00, Tue., 01 Apr. 0.0471 0.0377 0.0430
12:01-13:00, Tue., 01 Apr. 0.0493 0.0426 0.0457
11:01-12:00, Tue., 01 Apr. 0.0472 0.0426 0.0449
10:01-11:00, Tue., 01 Apr. 0.0489 0.0433 0.0464
09:01-10:00, Tue., 01 Apr. 0.0530 0.0463 0.0490
08:01-09:00, Tue., 01 Apr. 0.0557 0.0468 0.0519
07:01-08:00, Tue., 01 Apr. 0.0549 0.0436 0.0495
06:01-07:00, Tue., 01 Apr. 0.0499 0.0391 0.0434
05:01-06:00, Tue., 01 Apr. 0.0505 0.0429 0.0462
04:01-05:00, Tue., 01 Apr. 0.0528 0.0471 0.0502
03:01-04:00, Tue., 01 Apr. 0.0530 0.0453 0.0490
02:01-03:00, Tue., 01 Apr. 0.0501 0.0419 0.0461
01:01-02:00, Tue., 01 Apr. 0.0462 0.0356 0.0404
00:01-01:00, Tue., 01 Apr. 0.0398 0.0343 0.0363
23:01-24:00, Mon., 31 Mar. 0.0387 0.0339 0.0361
22:01-23:00, Mon., 31 Mar. 0.0415 0.0360 0.0382
21:01-22:00, Mon., 31 Mar. 0.0398 0.0346 0.0373
20:01-21:00, Mon., 31 Mar. 0.0374 0.0332 0.0351
19:01-20:00, Mon., 31 Mar. 0.0381 0.0333 0.0357
18:01-19:00, Mon., 31 Mar. 0.0374 0.0315 0.0348
17:01-18:00, Mon., 31 Mar. 0.0366 0.0316 0.0344
16:01-17:00, Mon., 31 Mar. 0.0368 0.0311 0.0340
15:01-16:00, Mon., 31 Mar. 0.0372 0.0327 0.0348
14:01-15:00, Mon., 31 Mar. 0.0365 0.0317 0.0339
13:01-14:00, Mon., 31 Mar. 0.0355 0.0315 0.0334
12:01-13:00, Mon., 31 Mar. 0.0360 0.0310 0.0334
11:01-12:00, Mon., 31 Mar. 0.0358 0.0315 0.0335
10:01-11:00, Mon., 31 Mar. 0.0360 0.0313 0.0335
09:01-10:00, Mon., 31 Mar. 0.0360 0.0306 0.0337
08:01-09:00, Mon., 31 Mar. 0.0358 0.0320 0.0338
07:01-08:00, Mon., 31 Mar. 0.0363 0.0319 0.0335
06:01-07:00, Mon., 31 Mar. 0.0359 0.0313 0.0336
05:01-06:00, Mon., 31 Mar. 0.0361 0.0308 0.0336
04:01-05:00, Mon., 31 Mar. 0.0363 0.0315 0.0336
03:01-04:00, Mon., 31 Mar. 0.0362 0.0311 0.0337
02:01-03:00, Mon., 31 Mar. 0.0352 0.0311 0.0332
01:01-02:00, Mon., 31 Mar. 0.0356 0.0315 0.0334
00:01-01:00, Mon., 31 Mar. 0.0369 0.0314 0.0339
23:01-24:00, Sun., 30 Mar. 0.0356 0.0315 0.0336
22:01-23:00, Sun., 30 Mar. 0.0363 0.0315 0.0336
21:01-22:00, Sun., 30 Mar. 0.0363 0.0307 0.0335
20:01-21:00, Sun., 30 Mar. 0.0356 0.0316 0.0334
19:01-20:00, Sun., 30 Mar. 0.0363 0.0317 0.0334
18:01-19:00, Sun., 30 Mar. 0.0363 0.0304 0.0334
17:01-18:00, Sun., 30 Mar. 0.0357 0.0316 0.0334
16:01-17:00, Sun., 30 Mar. 0.0356 0.0311 0.0331
15:01-16:00, Sun., 30 Mar. 0.0361 0.0309 0.0331
14:01-15:00, Sun., 30 Mar. 0.0356 0.0308 0.0332
13:01-14:00, Sun., 30 Mar. 0.0353 0.0308 0.0328
12:01-13:00, Sun., 30 Mar. 0.0354 0.0301 0.0332
11:01-12:00, Sun., 30 Mar. 0.0349 0.0309 0.0330
10:01-11:00, Sun., 30 Mar. 0.0360 0.0315 0.0333
09:01-10:00, Sun., 30 Mar. 0.0353 0.0318 0.0335
08:01-09:00, Sun., 30 Mar. 0.0353 0.0306 0.0334
07:01-08:00, Sun., 30 Mar. 0.0370 0.0318 0.0336
06:01-07:00, Sun., 30 Mar. 0.0361 0.0321 0.0338
05:01-06:00, Sun., 30 Mar. 0.0359 0.0317 0.0338
04:01-05:00, Sun., 30 Mar. 0.0354 0.0317 0.0336
03:01-04:00, Sun., 30 Mar. 0.0356 0.0311 0.0336
02:01-03:00, Sun., 30 Mar. 0.0353 0.0307 0.0333
01:01-02:00, Sun., 30 Mar. 0.0355 0.0314 0.0335
00:01-01:00, Sun., 30 Mar. 0.0360 0.0316 0.0337
23:01-24:00, Sat., 29 Mar. 0.0365 0.0311 0.0331
22:01-23:00, Sat., 29 Mar. 0.0354 0.0304 0.0338
21:01-22:00, Sat., 29 Mar. 0.0367 0.0325 0.0344
20:01-21:00, Sat., 29 Mar. 0.0382 0.0330 0.0357
19:01-20:00, Sat., 29 Mar. 0.0386 0.0328 0.0355
18:01-19:00, Sat., 29 Mar. 0.0433 0.0347 0.0389
17:01-18:00, Sat., 29 Mar. 0.0457 0.0396 0.0428
16:01-17:00, Sat., 29 Mar. 0.0476 0.0395 0.0441
15:01-16:00, Sat., 29 Mar. 0.0493 0.0417 0.0455
14:01-15:00, Sat., 29 Mar. 0.0482 0.0419 0.0450
13:01-14:00, Sat., 29 Mar. 0.0530 0.0442 0.0493
12:01-13:00, Sat., 29 Mar. 0.0550 0.0498 0.0523
11:01-12:00, Sat., 29 Mar. 0.0565 0.0496 0.0534
10:01-11:00, Sat., 29 Mar. 0.0597 0.0527 0.0563
09:01-10:00, Sat., 29 Mar. 0.0563 0.0482 0.0523
08:01-09:00, Sat., 29 Mar. 0.0589 0.0495 0.0549
07:01-08:00, Sat., 29 Mar. 0.0585 0.0464 0.0522
06:01-07:00, Sat., 29 Mar. 0.0475 0.0376 0.0425
05:01-06:00, Sat., 29 Mar. 0.0392 0.0316 0.0351
04:01-05:00, Sat., 29 Mar. 0.0370 0.0311 0.0343
03:01-04:00, Sat., 29 Mar. 0.0364 0.0311 0.0340
02:01-03:00, Sat., 29 Mar. 0.0368 0.0319 0.0340
01:01-02:00, Sat., 29 Mar. 0.0368 0.0320 0.0343
00:01-01:00, Sat., 29 Mar. 0.0364 0.0318 0.0341
23:01-24:00, Fri., 28 Mar. 0.0367 0.0316 0.0343
22:01-23:00, Fri., 28 Mar. 0.0371 0.0325 0.0347
21:01-22:00, Fri., 28 Mar. 0.0380 0.0332 0.0351
20:01-21:00, Fri., 28 Mar. 0.0374 0.0330 0.0348
19:01-20:00, Fri., 28 Mar. 0.0370 0.0327 0.0351
18:01-19:00, Fri., 28 Mar. 0.0367 0.0321 0.0350
17:01-18:00, Fri., 28 Mar. 0.0384 0.0319 0.0345
16:01-17:00, Fri., 28 Mar. 0.0372 0.0322 0.0344
15:01-16:00, Fri., 28 Mar. 0.0366 0.0320 0.0345
14:01-15:00, Fri., 28 Mar. 0.0381 0.0319 0.0345
13:01-14:00, Fri., 28 Mar. 0.0366 0.0324 0.0342
12:01-13:00, Fri., 28 Mar. 0.0370 0.0327 0.0344
11:01-12:00, Fri., 28 Mar. 0.0371 0.0323 0.0350
10:01-11:00, Fri., 28 Mar. 0.0375 0.0322 0.0349
09:01-10:00, Fri., 28 Mar. 0.0391 0.0325 0.0361
08:01-09:00, Fri., 28 Mar. 0.0455 0.0360 0.0410
07:01-08:00, Fri., 28 Mar. 0.0464 0.0352 0.0415
06:01-07:00, Fri., 28 Mar. 0.0381 0.0325 0.0347
05:01-06:00, Fri., 28 Mar. 0.0363 0.0330 0.0347
04:01-05:00, Fri., 28 Mar. 0.0384 0.0324 0.0348
03:01-04:00, Fri., 28 Mar. 0.0364 0.0315 0.0342
02:01-03:00, Fri., 28 Mar. 0.0362 0.0318 0.0339
01:01-02:00, Fri., 28 Mar. 0.0370 0.0307 0.0339
00:01-01:00, Fri., 28 Mar. 0.0356 0.0305 0.0337
23:01-24:00, Thu., 27 Mar. 0.0363 0.0316 0.0340
22:01-23:00, Thu., 27 Mar. 0.0364 0.0316 0.0340
21:01-22:00, Thu., 27 Mar. 0.0363 0.0321 0.0342
20:01-21:00, Thu., 27 Mar. 0.0377 0.0319 0.0340
19:01-20:00, Thu., 27 Mar. 0.0365 0.0318 0.0340
18:01-19:00, Thu., 27 Mar. 0.0369 0.0318 0.0346
17:01-18:00, Thu., 27 Mar. 0.0367 0.0318 0.0346
16:01-17:00, Thu., 27 Mar. 0.0372 0.0322 0.0349
15:01-16:00, Thu., 27 Mar. 0.0379 0.0323 0.0350
14:01-15:00, Thu., 27 Mar. 0.0377 0.0327 0.0349
13:01-14:00, Thu., 27 Mar. 0.0368 0.0323 0.0348
12:01-13:00, Thu., 27 Mar. 0.0367 0.0326 0.0348
11:01-12:00, Thu., 27 Mar. 0.0374 0.0330 0.0351
10:01-11:00, Thu., 27 Mar. 0.0371 0.0315 0.0344
09:01-10:00, Thu., 27 Mar. 0.0379 0.0317 0.0344
08:01-09:00, Thu., 27 Mar. 0.0367 0.0325 0.0346
07:01-08:00, Thu., 27 Mar. 0.0380 0.0322 0.0349
06:01-07:00, Thu., 27 Mar. 0.0379 0.0329 0.0352
05:01-06:00, Thu., 27 Mar. 0.0373 0.0323 0.0348
04:01-05:00, Thu., 27 Mar. 0.0370 0.0322 0.0345
03:01-04:00, Thu., 27 Mar. 0.0366 0.0316 0.0339
02:01-03:00, Thu., 27 Mar. 0.0369 0.0316 0.0341
01:01-02:00, Thu., 27 Mar. 0.0362 0.0311 0.0341
00:01-01:00, Thu., 27 Mar. 0.0363 0.0318 0.0339
23:01-24:00, Wed., 26 Mar. 0.0369 0.0322 0.0343
22:01-23:00, Wed., 26 Mar. 0.0363 0.0318 0.0344
21:01-22:00, Wed., 26 Mar. 0.0359 0.0317 0.0340
20:01-21:00, Wed., 26 Mar. 0.0367 0.0317 0.0342
19:01-20:00, Wed., 26 Mar. 0.0372 0.0328 0.0349
18:01-19:00, Wed., 26 Mar. 0.0370 0.0331 0.0347
17:01-18:00, Wed., 26 Mar. 0.0374 0.0326 0.0347
16:01-17:00, Wed., 26 Mar. 0.0367 0.0325 0.0349
15:01-16:00, Wed., 26 Mar. 0.0372 0.0331 0.0352
14:01-15:00, Wed., 26 Mar. 0.0372 0.0314 0.0348
13:01-14:00, Wed., 26 Mar. 0.0367 0.0321 0.0348
12:01-13:00, Wed., 26 Mar. 0.0378 0.0331 0.0349
11:01-12:00, Wed., 26 Mar. 0.0369 0.0333 0.0349
10:01-11:00, Wed., 26 Mar. 0.0374 0.0322 0.0349
09:01-10:00, Wed., 26 Mar. 0.0370 0.0325 0.0347
08:01-09:00, Wed., 26 Mar. 0.0369 0.0318 0.0346
07:01-08:00, Wed., 26 Mar. 0.0375 0.0321 0.0344
06:01-07:00, Wed., 26 Mar. 0.0364 0.0317 0.0342
05:01-06:00, Wed., 26 Mar. 0.0367 0.0319 0.0338
04:01-05:00, Wed., 26 Mar. 0.0365 0.0320 0.0342
03:01-04:00, Wed., 26 Mar. 0.0367 0.0315 0.0339
02:01-03:00, Wed., 26 Mar. 0.0366 0.0311 0.0340
01:01-02:00, Wed., 26 Mar. 0.0355 0.0312 0.0336
00:01-01:00, Wed., 26 Mar. 0.0364 0.0320 0.0338
23:01-24:00, Tue., 25 Mar. 0.0360 0.0316 0.0338
22:01-23:00, Tue., 25 Mar. 0.0364 0.0322 0.0341
21:01-22:00, Tue., 25 Mar. 0.0364 0.0320 0.0344
20:01-21:00, Tue., 25 Mar. 0.0367 0.0322 0.0345
19:01-20:00, Tue., 25 Mar. 0.0369 0.0318 0.0346
18:01-19:00, Tue., 25 Mar. 0.0369 0.0312 0.0345
17:01-18:00, Tue., 25 Mar. 0.0366 0.0331 0.0348
16:01-17:00, Tue., 25 Mar. 0.0375 0.0325 0.0349
15:01-16:00, Tue., 25 Mar. 0.0364 0.0329 0.0345
14:01-15:00, Tue., 25 Mar. 0.0372 0.0315 0.0344
13:01-14:00, Tue., 25 Mar. 0.0368 0.0322 0.0346
12:01-13:00, Tue., 25 Mar. 0.0377 0.0325 0.0346
11:01-12:00, Tue., 25 Mar. 0.0373 0.0330 0.0347
10:01-11:00, Tue., 25 Mar. 0.0373 0.0322 0.0345
09:01-10:00, Tue., 25 Mar. 0.0357 0.0311 0.0339
08:01-09:00, Tue., 25 Mar. 0.0356 0.0320 0.0338
07:01-08:00, Tue., 25 Mar. 0.0367 0.0315 0.0340
06:01-07:00, Tue., 25 Mar. 0.0369 0.0315 0.0342
05:01-06:00, Tue., 25 Mar. 0.0367 0.0322 0.0338
04:01-05:00, Tue., 25 Mar. 0.0366 0.0315 0.0337
03:01-04:00, Tue., 25 Mar. 0.0363 0.0315 0.0341
02:01-03:00, Tue., 25 Mar. 0.0363 0.0313 0.0344
01:01-02:00, Tue., 25 Mar. 0.0375 0.0322 0.0342
00:01-01:00, Tue., 25 Mar. 0.0367 0.0318 0.0344
23:01-24:00, Mon., 24 Mar. 0.0372 0.0313 0.0337
22:01-23:00, Mon., 24 Mar. 0.0355 0.0322 0.0337
21:01-22:00, Mon., 24 Mar. 0.0363 0.0313 0.0337
20:01-21:00, Mon., 24 Mar. 0.0360 0.0305 0.0333
19:01-20:00, Mon., 24 Mar. 0.0352 0.0305 0.0331
18:01-19:00, Mon., 24 Mar. 0.0365 0.0313 0.0336
17:01-18:00, Mon., 24 Mar. 0.0360 0.0321 0.0338
16:01-17:00, Mon., 24 Mar. 0.0359 0.0309 0.0338
15:01-16:00, Mon., 24 Mar. 0.0360 0.0310 0.0337
14:01-15:00, Mon., 24 Mar. 0.0380 0.0315 0.0339
13:01-14:00, Mon., 24 Mar. 0.0360 0.0318 0.0338
12:01-13:00, Mon., 24 Mar. 0.0370 0.0306 0.0335
11:01-12:00, Mon., 24 Mar. 0.0364 0.0318 0.0341
10:01-11:00, Mon., 24 Mar. 0.0360 0.0297 0.0336
09:01-10:00, Mon., 24 Mar. 0.0385 0.0314 0.0342
08:01-09:00, Mon., 24 Mar. 0.0361 0.0319 0.0343
07:01-08:00, Mon., 24 Mar. 0.0368 0.0321 0.0344
06:01-07:00, Mon., 24 Mar. 0.0370 0.0318 0.0342
05:01-06:00, Mon., 24 Mar. 0.0381 0.0316 0.0345
04:01-05:00, Mon., 24 Mar. 0.0370 0.0311 0.0342
03:01-04:00, Mon., 24 Mar. 0.0360 0.0325 0.0344
02:01-03:00, Mon., 24 Mar. 0.0360 0.0322 0.0342
01:01-02:00, Mon., 24 Mar. 0.0357 0.0307 0.0336
00:01-01:00, Mon., 24 Mar. 0.0365 0.0310 0.0333
23:01-24:00, Sun., 23 Mar. 0.0359 0.0319 0.0337
22:01-23:00, Sun., 23 Mar. 0.0370 0.0310 0.0335
21:01-22:00, Sun., 23 Mar. 0.0364 0.0302 0.0334
20:01-21:00, Sun., 23 Mar. 0.0359 0.0315 0.0333
19:01-20:00, Sun., 23 Mar. 0.0363 0.0313 0.0339
18:01-19:00, Sun., 23 Mar. 0.0368 0.0322 0.0343
17:01-18:00, Sun., 23 Mar. 0.0365 0.0321 0.0341
16:01-17:00, Sun., 23 Mar. 0.0371 0.0308 0.0343
15:01-16:00, Sun., 23 Mar. 0.0370 0.0326 0.0342
14:01-15:00, Sun., 23 Mar. 0.0372 0.0318 0.0341
13:01-14:00, Sun., 23 Mar. 0.0363 0.0317 0.0340
12:01-13:00, Sun., 23 Mar. 0.0382 0.0311 0.0342
11:01-12:00, Sun., 23 Mar. 0.0367 0.0315 0.0346