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, Fri., 04 Apr. 0.0355 0.0305 0.0329
09:01-10:00, Fri., 04 Apr. 0.0350 0.0308 0.0332
08:01-09:00, Fri., 04 Apr. 0.0363 0.0315 0.0338
07:01-08:00, Fri., 04 Apr. 0.0365 0.0308 0.0341
06:01-07:00, Fri., 04 Apr. 0.0379 0.0323 0.0348
05:01-06:00, Fri., 04 Apr. 0.0376 0.0330 0.0351
04:01-05:00, Fri., 04 Apr. 0.0366 0.0325 0.0345
03:01-04:00, Fri., 04 Apr. 0.0374 0.0311 0.0344
02:01-03:00, Fri., 04 Apr. 0.0369 0.0308 0.0336
01:01-02:00, Fri., 04 Apr. 0.0353 0.0309 0.0331
00:01-01:00, Fri., 04 Apr. 0.0353 0.0303 0.0327
23:01-24:00, Thu., 03 Apr. 0.0356 0.0304 0.0326
22:01-23:00, Thu., 03 Apr. 0.0351 0.0306 0.0323
21:01-22:00, Thu., 03 Apr. 0.0349 0.0299 0.0325
20:01-21:00, Thu., 03 Apr. 0.0346 0.0298 0.0326
19:01-20:00, Thu., 03 Apr. 0.0355 0.0308 0.0325
18:01-19:00, Thu., 03 Apr. 0.0348 0.0304 0.0326
17:01-18:00, Thu., 03 Apr. 0.0354 0.0297 0.0323
16:01-17:00, Thu., 03 Apr. 0.0342 0.0298 0.0323
15:01-16:00, Thu., 03 Apr. 0.0354 0.0308 0.0331
14:01-15:00, Thu., 03 Apr. 0.0378 0.0329 0.0354
13:01-14:00, Thu., 03 Apr. 0.0385 0.0343 0.0363
12:01-13:00, Thu., 03 Apr. 0.0392 0.0334 0.0363
11:01-12:00, Thu., 03 Apr. 0.0391 0.0343 0.0368
10:01-11:00, Thu., 03 Apr. 0.0406 0.0344 0.0372
09:01-10:00, Thu., 03 Apr. 0.0382 0.0335 0.0365
08:01-09:00, Thu., 03 Apr. 0.0422 0.0353 0.0389
07:01-08:00, Thu., 03 Apr. 0.0418 0.0328 0.0377
06:01-07:00, Thu., 03 Apr. 0.0352 0.0307 0.0331
05:01-06:00, Thu., 03 Apr. 0.0350 0.0303 0.0329
04:01-05:00, Thu., 03 Apr. 0.0343 0.0299 0.0324
03:01-04:00, Thu., 03 Apr. 0.0349 0.0298 0.0322
02:01-03:00, Thu., 03 Apr. 0.0339 0.0300 0.0319
01:01-02:00, Thu., 03 Apr. 0.0354 0.0297 0.0325
00:01-01:00, Thu., 03 Apr. 0.0344 0.0301 0.0321
23:01-24:00, Wed., 02 Apr. 0.0345 0.0301 0.0323
22:01-23:00, Wed., 02 Apr. 0.0352 0.0308 0.0325
21:01-22:00, Wed., 02 Apr. 0.0353 0.0303 0.0329
20:01-21:00, Wed., 02 Apr. 0.0349 0.0307 0.0328
19:01-20:00, Wed., 02 Apr. 0.0363 0.0319 0.0343
18:01-19:00, Wed., 02 Apr. 0.0385 0.0328 0.0355
17:01-18:00, Wed., 02 Apr. 0.0388 0.0334 0.0361
16:01-17:00, Wed., 02 Apr. 0.0377 0.0301 0.0338
15:01-16:00, Wed., 02 Apr. 0.0363 0.0304 0.0329
14:01-15:00, Wed., 02 Apr. 0.0350 0.0304 0.0324
13:01-14:00, Wed., 02 Apr. 0.0360 0.0310 0.0332
12:01-13:00, Wed., 02 Apr. 0.0350 0.0311 0.0332
11:01-12:00, Wed., 02 Apr. 0.0367 0.0309 0.0339
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