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
00:01-01:00, Sat., 07 Nov. 0.0348 0.0306 0.0322
23:01-24:00, Fri., 06 Nov. 0.0356 0.0302 0.0324
22:01-23:00, Fri., 06 Nov. 0.0350 0.0304 0.0327
21:01-22:00, Fri., 06 Nov. 0.0354 0.0304 0.0326
20:01-21:00, Fri., 06 Nov. 0.0350 0.0304 0.0327
19:01-20:00, Fri., 06 Nov. 0.0343 0.0300 0.0325
18:01-19:00, Fri., 06 Nov. 0.0350 0.0308 0.0326
17:01-18:00, Fri., 06 Nov. 0.0346 0.0307 0.0328
16:01-17:00, Fri., 06 Nov. 0.0360 0.0308 0.0332
15:01-16:00, Fri., 06 Nov. 0.0361 0.0299 0.0328
14:01-15:00, Fri., 06 Nov. 0.0349 0.0301 0.0326
13:01-14:00, Fri., 06 Nov. 0.0355 0.0308 0.0330
12:01-13:00, Fri., 06 Nov. 0.0350 0.0308 0.0329
11:01-12:00, Fri., 06 Nov. 0.0343 0.0316 0.0331
10:01-11:00, Fri., 06 Nov. 0.0361 0.0308 0.0332
09:01-10:00, Fri., 06 Nov. 0.0356 0.0295 0.0329
08:01-09:00, Fri., 06 Nov. 0.0351 0.0306 0.0326
07:01-08:00, Fri., 06 Nov. 0.0356 0.0304 0.0328
06:01-07:00, Fri., 06 Nov. 0.0354 0.0313 0.0329
05:01-06:00, Fri., 06 Nov. 0.0363 0.0311 0.0333
04:01-05:00, Fri., 06 Nov. 0.0351 0.0306 0.0332
03:01-04:00, Fri., 06 Nov. 0.0353 0.0296 0.0326
02:01-03:00, Fri., 06 Nov. 0.0357 0.0310 0.0330
01:01-02:00, Fri., 06 Nov. 0.0353 0.0295 0.0328
00:01-01:00, Fri., 06 Nov. 0.0348 0.0297 0.0321
23:01-24:00, Thu., 05 Nov. 0.0344 0.0304 0.0322
22:01-23:00, Thu., 05 Nov. 0.0346 0.0291 0.0322
21:01-22:00, Thu., 05 Nov. 0.0356 0.0295 0.0322
20:01-21:00, Thu., 05 Nov. 0.0353 0.0300 0.0321
19:01-20:00, Thu., 05 Nov. 0.0346 0.0300 0.0321
18:01-19:00, Thu., 05 Nov. 0.0355 0.0283 0.0317
17:01-18:00, Thu., 05 Nov. 0.0342 0.0289 0.0316
16:01-17:00, Thu., 05 Nov. 0.0342 0.0290 0.0314
15:01-16:00, Thu., 05 Nov. 0.0338 0.0291 0.0317
14:01-15:00, Thu., 05 Nov. 0.0343 0.0302 0.0321
13:01-14:00, Thu., 05 Nov. 0.0359 0.0304 0.0328
12:01-13:00, Thu., 05 Nov. 0.0354 0.0296 0.0322
11:01-12:00, Thu., 05 Nov. 0.0340 0.0304 0.0321
10:01-11:00, Thu., 05 Nov. 0.0360 0.0302 0.0336
09:01-10:00, Thu., 05 Nov. 0.0407 0.0343 0.0374
08:01-09:00, Thu., 05 Nov. 0.0387 0.0341 0.0363
07:01-08:00, Thu., 05 Nov. 0.0419 0.0345 0.0374
06:01-07:00, Thu., 05 Nov. 0.0426 0.0377 0.0401
05:01-06:00, Thu., 05 Nov. 0.0455 0.0390 0.0425
04:01-05:00, Thu., 05 Nov. 0.0473 0.0409 0.0442
03:01-04:00, Thu., 05 Nov. 0.0474 0.0412 0.0441
02:01-03:00, Thu., 05 Nov. 0.0467 0.0412 0.0439
01:01-02:00, Thu., 05 Nov. 0.0478 0.0402 0.0439
00:01-01:00, Thu., 05 Nov. 0.0532 0.0436 0.0490
23:01-24:00, Wed., 04 Nov. 0.0499 0.0423 0.0463
22:01-23:00, Wed., 04 Nov. 0.0473 0.0406 0.0444
21:01-22:00, Wed., 04 Nov. 0.0462 0.0404 0.0437
20:01-21:00, Wed., 04 Nov. 0.0449 0.0395 0.0428
19:01-20:00, Wed., 04 Nov. 0.0437 0.0377 0.0403
18:01-19:00, Wed., 04 Nov. 0.0431 0.0377 0.0406
17:01-18:00, Wed., 04 Nov. 0.0416 0.0363 0.0393
16:01-17:00, Wed., 04 Nov. 0.0419 0.0361 0.0389
15:01-16:00, Wed., 04 Nov. 0.0402 0.0356 0.0377
14:01-15:00, Wed., 04 Nov. 0.0433 0.0371 0.0398
13:01-14:00, Wed., 04 Nov. 0.0474 0.0350 0.0420
12:01-13:00, Wed., 04 Nov. 0.0381 0.0319 0.0348
11:01-12:00, Wed., 04 Nov. 0.0357 0.0316 0.0334
10:01-11:00, Wed., 04 Nov. 0.0360 0.0315 0.0338
09:01-10:00, Wed., 04 Nov. 0.0358 0.0315 0.0338
08:01-09:00, Wed., 04 Nov. 0.0348 0.0309 0.0331
07:01-08:00, Wed., 04 Nov. 0.0354 0.0314 0.0333
06:01-07:00, Wed., 04 Nov. 0.0356 0.0313 0.0337
05:01-06:00, Wed., 04 Nov. 0.0356 0.0315 0.0332
04:01-05:00, Wed., 04 Nov. 0.0355 0.0304 0.0328
03:01-04:00, Wed., 04 Nov. 0.0347 0.0305 0.0331
02:01-03:00, Wed., 04 Nov. 0.0352 0.0310 0.0328
01:01-02:00, Wed., 04 Nov. 0.0360 0.0308 0.0335
00:01-01:00, Wed., 04 Nov. 0.0362 0.0319 0.0339
23:01-24:00, Tue., 03 Nov. 0.0356 0.0314 0.0334
22:01-23:00, Tue., 03 Nov. 0.0368 0.0312 0.0333
21:01-22:00, Tue., 03 Nov. 0.0348 0.0295 0.0329
20:01-21:00, Tue., 03 Nov. 0.0353 0.0312 0.0330
19:01-20:00, Tue., 03 Nov. 0.0346 0.0309 0.0327
18:01-19:00, Tue., 03 Nov. 0.0358 0.0308 0.0327
17:01-18:00, Tue., 03 Nov. 0.0355 0.0307 0.0327
16:01-17:00, Tue., 03 Nov. 0.0347 0.0312 0.0330
15:01-16:00, Tue., 03 Nov. 0.0354 0.0316 0.0333
14:01-15:00, Tue., 03 Nov. 0.0360 0.0309 0.0332
13:01-14:00, Tue., 03 Nov. 0.0361 0.0301 0.0330
12:01-13:00, Tue., 03 Nov. 0.0353 0.0306 0.0329
11:01-12:00, Tue., 03 Nov. 0.0353 0.0301 0.0331
10:01-11:00, Tue., 03 Nov. 0.0353 0.0303 0.0326
09:01-10:00, Tue., 03 Nov. 0.0354 0.0309 0.0330
08:01-09:00, Tue., 03 Nov. 0.0351 0.0308 0.0330
07:01-08:00, Tue., 03 Nov. 0.0360 0.0313 0.0333
06:01-07:00, Tue., 03 Nov. 0.0369 0.0311 0.0335
05:01-06:00, Tue., 03 Nov. 0.0356 0.0316 0.0335
04:01-05:00, Tue., 03 Nov. 0.0369 0.0323 0.0339
03:01-04:00, Tue., 03 Nov. 0.0379 0.0322 0.0345
02:01-03:00, Tue., 03 Nov. 0.0359 0.0306 0.0335
01:01-02:00, Tue., 03 Nov. 0.0352 0.0312 0.0333
00:01-01:00, Tue., 03 Nov. 0.0354 0.0315 0.0334
23:01-24:00, Mon., 02 Nov. 0.0355 0.0311 0.0334
22:01-23:00, Mon., 02 Nov. 0.0359 0.0311 0.0333
21:01-22:00, Mon., 02 Nov. 0.0361 0.0307 0.0334
20:01-21:00, Mon., 02 Nov. 0.0356 0.0313 0.0335
19:01-20:00, Mon., 02 Nov. 0.0377 0.0323 0.0347
18:01-19:00, Mon., 02 Nov. 0.0469 0.0348 0.0395
17:01-18:00, Mon., 02 Nov. 0.0508 0.0439 0.0477
16:01-17:00, Mon., 02 Nov. 0.0503 0.0431 0.0457
15:01-16:00, Mon., 02 Nov. 0.0450 0.0383 0.0418
14:01-15:00, Mon., 02 Nov. 0.0410 0.0338 0.0375
13:01-14:00, Mon., 02 Nov. 0.0368 0.0321 0.0344
12:01-13:00, Mon., 02 Nov. 0.0364 0.0308 0.0341
11:01-12:00, Mon., 02 Nov. 0.0367 0.0320 0.0342
10:01-11:00, Mon., 02 Nov. 0.0365 0.0308 0.0334
09:01-10:00, Mon., 02 Nov. 0.0360 0.0308 0.0333
08:01-09:00, Mon., 02 Nov. 0.0356 0.0319 0.0336
07:01-08:00, Mon., 02 Nov. 0.0363 0.0308 0.0335
06:01-07:00, Mon., 02 Nov. 0.0364 0.0313 0.0337
05:01-06:00, Mon., 02 Nov. 0.0359 0.0313 0.0337
04:01-05:00, Mon., 02 Nov. 0.0358 0.0312 0.0337
03:01-04:00, Mon., 02 Nov. 0.0359 0.0315 0.0336
02:01-03:00, Mon., 02 Nov. 0.0365 0.0310 0.0336
01:01-02:00, Mon., 02 Nov. 0.0360 0.0322 0.0338
00:01-01:00, Mon., 02 Nov. 0.0360 0.0307 0.0337
23:01-24:00, Sun., 01 Nov. 0.0360 0.0308 0.0336
22:01-23:00, Sun., 01 Nov. 0.0346 0.0298 0.0328
21:01-22:00, Sun., 01 Nov. 0.0354 0.0295 0.0328
20:01-21:00, Sun., 01 Nov. 0.0354 0.0297 0.0328
19:01-20:00, Sun., 01 Nov. 0.0366 0.0303 0.0328
18:01-19:00, Sun., 01 Nov. 0.0352 0.0308 0.0329
17:01-18:00, Sun., 01 Nov. 0.0359 0.0309 0.0330
16:01-17:00, Sun., 01 Nov. 0.0365 0.0307 0.0332
15:01-16:00, Sun., 01 Nov. 0.0353 0.0308 0.0330
14:01-15:00, Sun., 01 Nov. 0.0353 0.0312 0.0331
13:01-14:00, Sun., 01 Nov. 0.0356 0.0308 0.0333
12:01-13:00, Sun., 01 Nov. 0.0356 0.0317 0.0335
11:01-12:00, Sun., 01 Nov. 0.0353 0.0307 0.0330
10:01-11:00, Sun., 01 Nov. 0.0349 0.0304 0.0331
09:01-10:00, Sun., 01 Nov. 0.0363 0.0311 0.0335
08:01-09:00, Sun., 01 Nov. 0.0367 0.0311 0.0339
07:01-08:00, Sun., 01 Nov. 0.0375 0.0311 0.0337
06:01-07:00, Sun., 01 Nov. 0.0356 0.0303 0.0334
05:01-06:00, Sun., 01 Nov. 0.0355 0.0309 0.0334
04:01-05:00, Sun., 01 Nov. 0.0353 0.0308 0.0333
03:01-04:00, Sun., 01 Nov. 0.0359 0.0309 0.0334
02:01-03:00, Sun., 01 Nov. 0.0364 0.0320 0.0340
01:01-02:00, Sun., 01 Nov. 0.0353 0.0318 0.0335
00:01-01:00, Sun., 01 Nov. 0.0351 0.0309 0.0332
23:01-24:00, Sat., 31 Oct. 0.0356 0.0311 0.0333
22:01-23:00, Sat., 31 Oct. 0.0359 0.0308 0.0331
21:01-22:00, Sat., 31 Oct. 0.0363 0.0301 0.0327
20:01-21:00, Sat., 31 Oct. 0.0344 0.0301 0.0323
19:01-20:00, Sat., 31 Oct. 0.0345 0.0306 0.0327
18:01-19:00, Sat., 31 Oct. 0.0356 0.0308 0.0329
17:01-18:00, Sat., 31 Oct. 0.0348 0.0297 0.0326
16:01-17:00, Sat., 31 Oct. 0.0349 0.0307 0.0330
15:01-16:00, Sat., 31 Oct. 0.0349 0.0311 0.0331
14:01-15:00, Sat., 31 Oct. 0.0356 0.0301 0.0331
13:01-14:00, Sat., 31 Oct. 0.0357 0.0321 0.0339
12:01-13:00, Sat., 31 Oct. 0.0357 0.0314 0.0334
11:01-12:00, Sat., 31 Oct. 0.0363 0.0310 0.0336
10:01-11:00, Sat., 31 Oct. 0.0352 0.0298 0.0333
09:01-10:00, Sat., 31 Oct. 0.0361 0.0308 0.0336
08:01-09:00, Sat., 31 Oct. 0.0370 0.0314 0.0342
07:01-08:00, Sat., 31 Oct. 0.0367 0.0312 0.0340
06:01-07:00, Sat., 31 Oct. 0.0359 0.0311 0.0338
05:01-06:00, Sat., 31 Oct. 0.0360 0.0306 0.0337
04:01-05:00, Sat., 31 Oct. 0.0360 0.0312 0.0338
03:01-04:00, Sat., 31 Oct. 0.0361 0.0306 0.0333
02:01-03:00, Sat., 31 Oct. 0.0363 0.0311 0.0337
01:01-02:00, Sat., 31 Oct. 0.0360 0.0316 0.0338
00:01-01:00, Sat., 31 Oct. 0.0367 0.0309 0.0338
23:01-24:00, Fri., 30 Oct. 0.0374 0.0321 0.0343
22:01-23:00, Fri., 30 Oct. 0.0369 0.0322 0.0342
21:01-22:00, Fri., 30 Oct. 0.0364 0.0309 0.0335
20:01-21:00, Fri., 30 Oct. 0.0363 0.0313 0.0335
19:01-20:00, Fri., 30 Oct. 0.0356 0.0312 0.0333
18:01-19:00, Fri., 30 Oct. 0.0351 0.0311 0.0329
17:01-18:00, Fri., 30 Oct. 0.0368 0.0309 0.0332
16:01-17:00, Fri., 30 Oct. 0.0353 0.0303 0.0331
15:01-16:00, Fri., 30 Oct. 0.0355 0.0311 0.0329
14:01-15:00, Fri., 30 Oct. 0.0343 0.0303 0.0327
13:01-14:00, Fri., 30 Oct. 0.0348 0.0300 0.0325
12:01-13:00, Fri., 30 Oct. 0.0356 0.0308 0.0328
11:01-12:00, Fri., 30 Oct. 0.0356 0.0308 0.0327
10:01-11:00, Fri., 30 Oct. 0.0363 0.0308 0.0334
09:01-10:00, Fri., 30 Oct. 0.0391 0.0322 0.0360
08:01-09:00, Fri., 30 Oct. 0.0435 0.0356 0.0392
07:01-08:00, Fri., 30 Oct. 0.0474 0.0409 0.0442
06:01-07:00, Fri., 30 Oct. 0.0468 0.0346 0.0412
05:01-06:00, Fri., 30 Oct. 0.0381 0.0324 0.0345
04:01-05:00, Fri., 30 Oct. 0.0360 0.0313 0.0331
03:01-04:00, Fri., 30 Oct. 0.0349 0.0310 0.0330
02:01-03:00, Fri., 30 Oct. 0.0349 0.0308 0.0328
01:01-02:00, Fri., 30 Oct. 0.0356 0.0308 0.0328
00:01-01:00, Fri., 30 Oct. 0.0342 0.0298 0.0323
23:01-24:00, Thu., 29 Oct. 0.0351 0.0309 0.0327
22:01-23:00, Thu., 29 Oct. 0.0349 0.0306 0.0322
21:01-22:00, Thu., 29 Oct. 0.0340 0.0301 0.0323
20:01-21:00, Thu., 29 Oct. 0.0346 0.0290 0.0322
19:01-20:00, Thu., 29 Oct. 0.0344 0.0297 0.0321
18:01-19:00, Thu., 29 Oct. 0.0341 0.0295 0.0323
17:01-18:00, Thu., 29 Oct. 0.0345 0.0308 0.0325
16:01-17:00, Thu., 29 Oct. 0.0371 0.0309 0.0333
15:01-16:00, Thu., 29 Oct. 0.0368 0.0316 0.0341
14:01-15:00, Thu., 29 Oct. 0.0345 0.0302 0.0323
13:01-14:00, Thu., 29 Oct. 0.0349 0.0294 0.0323
12:01-13:00, Thu., 29 Oct. 0.0343 0.0298 0.0324
11:01-12:00, Thu., 29 Oct. 0.0349 0.0303 0.0323
10:01-11:00, Thu., 29 Oct. 0.0349 0.0298 0.0325
09:01-10:00, Thu., 29 Oct. 0.0352 0.0306 0.0325
08:01-09:00, Thu., 29 Oct. 0.0346 0.0304 0.0324
07:01-08:00, Thu., 29 Oct. 0.0353 0.0304 0.0327
06:01-07:00, Thu., 29 Oct. 0.0349 0.0312 0.0328
05:01-06:00, Thu., 29 Oct. 0.0365 0.0313 0.0335
04:01-05:00, Thu., 29 Oct. 0.0353 0.0298 0.0326
03:01-04:00, Thu., 29 Oct. 0.0343 0.0294 0.0320
02:01-03:00, Thu., 29 Oct. 0.0339 0.0296 0.0323
01:01-02:00, Thu., 29 Oct. 0.0339 0.0296 0.0322
00:01-01:00, Thu., 29 Oct. 0.0338 0.0300 0.0321
23:01-24:00, Wed., 28 Oct. 0.0349 0.0296 0.0322
22:01-23:00, Wed., 28 Oct. 0.0336 0.0301 0.0318
21:01-22:00, Wed., 28 Oct. 0.0363 0.0297 0.0321
20:01-21:00, Wed., 28 Oct. 0.0344 0.0301 0.0320
19:01-20:00, Wed., 28 Oct. 0.0339 0.0294 0.0319
18:01-19:00, Wed., 28 Oct. 0.0339 0.0291 0.0319
17:01-18:00, Wed., 28 Oct. 0.0343 0.0297 0.0318
16:01-17:00, Wed., 28 Oct. 0.0344 0.0294 0.0319
15:01-16:00, Wed., 28 Oct. 0.0352 0.0300 0.0321
14:01-15:00, Wed., 28 Oct. 0.0346 0.0297 0.0322
13:01-14:00, Wed., 28 Oct. 0.0352 0.0303 0.0326
12:01-13:00, Wed., 28 Oct. 0.0351 0.0311 0.0329
11:01-12:00, Wed., 28 Oct. 0.0346 0.0306 0.0328
10:01-11:00, Wed., 28 Oct. 0.0343 0.0308 0.0325
09:01-10:00, Wed., 28 Oct. 0.0346 0.0306 0.0328
08:01-09:00, Wed., 28 Oct. 0.0349 0.0304 0.0325
07:01-08:00, Wed., 28 Oct. 0.0352 0.0305 0.0324
06:01-07:00, Wed., 28 Oct. 0.0343 0.0301 0.0323
05:01-06:00, Wed., 28 Oct. 0.0346 0.0294 0.0324
04:01-05:00, Wed., 28 Oct. 0.0350 0.0305 0.0324
03:01-04:00, Wed., 28 Oct. 0.0348 0.0296 0.0324
02:01-03:00, Wed., 28 Oct. 0.0353 0.0302 0.0323
01:01-02:00, Wed., 28 Oct. 0.0343 0.0301 0.0322