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
19:01-20:00, Sat., 01 Aug. 0.0381 0.0329 0.0347
18:01-19:00, Sat., 01 Aug. 0.0366 0.0327 0.0344
17:01-18:00, Sat., 01 Aug. 0.0370 0.0308 0.0341
16:01-17:00, Sat., 01 Aug. 0.0362 0.0322 0.0343
15:01-16:00, Sat., 01 Aug. 0.0371 0.0323 0.0344
14:01-15:00, Sat., 01 Aug. 0.0374 0.0323 0.0347
13:01-14:00, Sat., 01 Aug. 0.0373 0.0318 0.0345
12:01-13:00, Sat., 01 Aug. 0.0370 0.0311 0.0342
11:01-12:00, Sat., 01 Aug. 0.0374 0.0315 0.0347
10:01-11:00, Sat., 01 Aug. 0.0380 0.0322 0.0355
09:01-10:00, Sat., 01 Aug. 0.0398 0.0336 0.0358
08:01-09:00, Sat., 01 Aug. 0.0388 0.0341 0.0361
07:01-08:00, Sat., 01 Aug. 0.0386 0.0342 0.0363
06:01-07:00, Sat., 01 Aug. 0.0397 0.0339 0.0373
05:01-06:00, Sat., 01 Aug. 0.0398 0.0349 0.0375
04:01-05:00, Sat., 01 Aug. 0.0406 0.0352 0.0373
03:01-04:00, Sat., 01 Aug. 0.0391 0.0343 0.0366
02:01-03:00, Sat., 01 Aug. 0.0375 0.0325 0.0351
01:01-02:00, Sat., 01 Aug. 0.0377 0.0322 0.0346
00:01-01:00, Sat., 01 Aug. 0.0370 0.0315 0.0342
23:01-24:00, Fri., 31 Jul. 0.0358 0.0309 0.0339
22:01-23:00, Fri., 31 Jul. 0.0365 0.0325 0.0339
21:01-22:00, Fri., 31 Jul. 0.0365 0.0302 0.0337
20:01-21:00, Fri., 31 Jul. 0.0359 0.0315 0.0338
19:01-20:00, Fri., 31 Jul. 0.0359 0.0309 0.0337
18:01-19:00, Fri., 31 Jul. 0.0373 0.0317 0.0341
17:01-18:00, Fri., 31 Jul. 0.0370 0.0320 0.0342
16:01-17:00, Fri., 31 Jul. 0.0381 0.0330 0.0347
15:01-16:00, Fri., 31 Jul. 0.0385 0.0327 0.0357
14:01-15:00, Fri., 31 Jul. 0.0380 0.0323 0.0345
13:01-14:00, Fri., 31 Jul. 0.0365 0.0319 0.0341
12:01-13:00, Fri., 31 Jul. 0.0370 0.0324 0.0346
11:01-12:00, Fri., 31 Jul. 0.0366 0.0311 0.0344
10:01-11:00, Fri., 31 Jul. 0.0371 0.0323 0.0348
09:01-10:00, Fri., 31 Jul. 0.0387 0.0322 0.0355
08:01-09:00, Fri., 31 Jul. 0.0381 0.0343 0.0361
07:01-08:00, Fri., 31 Jul. 0.0394 0.0338 0.0364
06:01-07:00, Fri., 31 Jul. 0.0401 0.0333 0.0364
05:01-06:00, Fri., 31 Jul. 0.0381 0.0320 0.0360
04:01-05:00, Fri., 31 Jul. 0.0402 0.0337 0.0360
03:01-04:00, Fri., 31 Jul. 0.0375 0.0326 0.0352
02:01-03:00, Fri., 31 Jul. 0.0378 0.0329 0.0349
01:01-02:00, Fri., 31 Jul. 0.0370 0.0322 0.0346
00:01-01:00, Fri., 31 Jul. 0.0378 0.0325 0.0351
23:01-24:00, Thu., 30 Jul. 0.0384 0.0332 0.0355
22:01-23:00, Thu., 30 Jul. 0.0377 0.0327 0.0349
21:01-22:00, Thu., 30 Jul. 0.0363 0.0312 0.0340
20:01-21:00, Thu., 30 Jul. 0.0363 0.0309 0.0340
19:01-20:00, Thu., 30 Jul. 0.0361 0.0309 0.0336
18:01-19:00, Thu., 30 Jul. 0.0360 0.0315 0.0339
17:01-18:00, Thu., 30 Jul. 0.0366 0.0309 0.0338
16:01-17:00, Thu., 30 Jul. 0.0361 0.0320 0.0336
15:01-16:00, Thu., 30 Jul. 0.0357 0.0305 0.0337
14:01-15:00, Thu., 30 Jul. 0.0353 0.0314 0.0337
13:01-14:00, Thu., 30 Jul. 0.0359 0.0317 0.0339
12:01-13:00, Thu., 30 Jul. 0.0362 0.0323 0.0341
11:01-12:00, Thu., 30 Jul. 0.0365 0.0324 0.0344
10:01-11:00, Thu., 30 Jul. 0.0369 0.0311 0.0342
09:01-10:00, Thu., 30 Jul. 0.0372 0.0315 0.0347
08:01-09:00, Thu., 30 Jul. 0.0387 0.0321 0.0355
07:01-08:00, Thu., 30 Jul. 0.0380 0.0335 0.0355
06:01-07:00, Thu., 30 Jul. 0.0376 0.0325 0.0351
05:01-06:00, Thu., 30 Jul. 0.0369 0.0325 0.0345
04:01-05:00, Thu., 30 Jul. 0.0388 0.0326 0.0345
03:01-04:00, Thu., 30 Jul. 0.0362 0.0315 0.0343
02:01-03:00, Thu., 30 Jul. 0.0375 0.0318 0.0343
01:01-02:00, Thu., 30 Jul. 0.0381 0.0326 0.0349
00:01-01:00, Thu., 30 Jul. 0.0363 0.0318 0.0344
23:01-24:00, Wed., 29 Jul. 0.0363 0.0314 0.0341
22:01-23:00, Wed., 29 Jul. 0.0360 0.0314 0.0337
21:01-22:00, Wed., 29 Jul. 0.0360 0.0301 0.0334
20:01-21:00, Wed., 29 Jul. 0.0366 0.0315 0.0333
19:01-20:00, Wed., 29 Jul. 0.0353 0.0306 0.0329
18:01-19:00, Wed., 29 Jul. 0.0349 0.0305 0.0331
17:01-18:00, Wed., 29 Jul. 0.0349 0.0305 0.0328
16:01-17:00, Wed., 29 Jul. 0.0351 0.0308 0.0328
15:01-16:00, Wed., 29 Jul. 0.0352 0.0315 0.0331
14:01-15:00, Wed., 29 Jul. 0.0364 0.0313 0.0334
13:01-14:00, Wed., 29 Jul. 0.0367 0.0318 0.0335
12:01-13:00, Wed., 29 Jul. 0.0365 0.0310 0.0332
11:01-12:00, Wed., 29 Jul. 0.0357 0.0315 0.0337
10:01-11:00, Wed., 29 Jul. 0.0362 0.0315 0.0338
09:01-10:00, Wed., 29 Jul. 0.0364 0.0316 0.0340
08:01-09:00, Wed., 29 Jul. 0.0361 0.0322 0.0345
07:01-08:00, Wed., 29 Jul. 0.0379 0.0328 0.0347
06:01-07:00, Wed., 29 Jul. 0.0370 0.0326 0.0349
05:01-06:00, Wed., 29 Jul. 0.0370 0.0314 0.0345
04:01-05:00, Wed., 29 Jul. 0.0368 0.0312 0.0343
03:01-04:00, Wed., 29 Jul. 0.0374 0.0307 0.0337
02:01-03:00, Wed., 29 Jul. 0.0359 0.0319 0.0338
01:01-02:00, Wed., 29 Jul. 0.0367 0.0313 0.0337
00:01-01:00, Wed., 29 Jul. 0.0363 0.0311 0.0336
23:01-24:00, Tue., 28 Jul. 0.0371 0.0310 0.0338
22:01-23:00, Tue., 28 Jul. 0.0368 0.0314 0.0336
21:01-22:00, Tue., 28 Jul. 0.0360 0.0312 0.0331
20:01-21:00, Tue., 28 Jul. 0.0358 0.0301 0.0334
19:01-20:00, Tue., 28 Jul. 0.0363 0.0317 0.0340
18:01-19:00, Tue., 28 Jul. 0.0372 0.0325 0.0345
17:01-18:00, Tue., 28 Jul. 0.0355 0.0318 0.0334
16:01-17:00, Tue., 28 Jul. 0.0364 0.0321 0.0339
15:01-16:00, Tue., 28 Jul. 0.0427 0.0339 0.0370
14:01-15:00, Tue., 28 Jul. 0.0416 0.0333 0.0380
13:01-14:00, Tue., 28 Jul. 0.0348 0.0311 0.0329
12:01-13:00, Tue., 28 Jul. 0.0347 0.0301 0.0326
11:01-12:00, Tue., 28 Jul. 0.0348 0.0304 0.0324
10:01-11:00, Tue., 28 Jul. 0.0357 0.0301 0.0327
09:01-10:00, Tue., 28 Jul. 0.0346 0.0313 0.0327
08:01-09:00, Tue., 28 Jul. 0.0353 0.0299 0.0325
07:01-08:00, Tue., 28 Jul. 0.0344 0.0295 0.0324
06:01-07:00, Tue., 28 Jul. 0.0356 0.0305 0.0326
05:01-06:00, Tue., 28 Jul. 0.0349 0.0301 0.0327
04:01-05:00, Tue., 28 Jul. 0.0346 0.0305 0.0325
03:01-04:00, Tue., 28 Jul. 0.0355 0.0298 0.0329
02:01-03:00, Tue., 28 Jul. 0.0369 0.0311 0.0337
01:01-02:00, Tue., 28 Jul. 0.0384 0.0325 0.0353
00:01-01:00, Tue., 28 Jul. 0.0362 0.0311 0.0331
23:01-24:00, Mon., 27 Jul. 0.0354 0.0308 0.0330
22:01-23:00, Mon., 27 Jul. 0.0362 0.0308 0.0328
21:01-22:00, Mon., 27 Jul. 0.0356 0.0304 0.0327
20:01-21:00, Mon., 27 Jul. 0.0362 0.0312 0.0337
19:01-20:00, Mon., 27 Jul. 0.0397 0.0317 0.0362
18:01-19:00, Mon., 27 Jul. 0.0377 0.0324 0.0352
17:01-18:00, Mon., 27 Jul. 0.0369 0.0320 0.0344
16:01-17:00, Mon., 27 Jul. 0.0351 0.0304 0.0330
15:01-16:00, Mon., 27 Jul. 0.0351 0.0313 0.0331
14:01-15:00, Mon., 27 Jul. 0.0353 0.0311 0.0335
13:01-14:00, Mon., 27 Jul. 0.0363 0.0305 0.0331
12:01-13:00, Mon., 27 Jul. 0.0354 0.0306 0.0332
11:01-12:00, Mon., 27 Jul. 0.0361 0.0315 0.0334
10:01-11:00, Mon., 27 Jul. 0.0358 0.0311 0.0335
09:01-10:00, Mon., 27 Jul. 0.0360 0.0316 0.0335
08:01-09:00, Mon., 27 Jul. 0.0365 0.0311 0.0337
07:01-08:00, Mon., 27 Jul. 0.0367 0.0322 0.0343
06:01-07:00, Mon., 27 Jul. 0.0365 0.0316 0.0340
05:01-06:00, Mon., 27 Jul. 0.0365 0.0326 0.0343
04:01-05:00, Mon., 27 Jul. 0.0367 0.0318 0.0346
03:01-04:00, Mon., 27 Jul. 0.0364 0.0325 0.0342
02:01-03:00, Mon., 27 Jul. 0.0360 0.0319 0.0339
01:01-02:00, Mon., 27 Jul. 0.0360 0.0318 0.0339
00:01-01:00, Mon., 27 Jul. 0.0363 0.0317 0.0337
23:01-24:00, Sun., 26 Jul. 0.0358 0.0313 0.0338
22:01-23:00, Sun., 26 Jul. 0.0365 0.0312 0.0335
21:01-22:00, Sun., 26 Jul. 0.0353 0.0313 0.0336
20:01-21:00, Sun., 26 Jul. 0.0377 0.0328 0.0350
19:01-20:00, Sun., 26 Jul. 0.0411 0.0349 0.0386
18:01-19:00, Sun., 26 Jul. 0.0485 0.0345 0.0428
17:01-18:00, Sun., 26 Jul. 0.0361 0.0310 0.0333
16:01-17:00, Sun., 26 Jul. 0.0363 0.0311 0.0336
15:01-16:00, Sun., 26 Jul. 0.0370 0.0314 0.0340
14:01-15:00, Sun., 26 Jul. 0.0397 0.0322 0.0357
13:01-14:00, Sun., 26 Jul. 0.0471 0.0374 0.0417
12:01-13:00, Sun., 26 Jul. 0.0482 0.0308 0.0393
11:01-12:00, Sun., 26 Jul. 0.0356 0.0304 0.0332
10:01-11:00, Sun., 26 Jul. 0.0374 0.0310 0.0334
09:01-10:00, Sun., 26 Jul. 0.0349 0.0308 0.0332
08:01-09:00, Sun., 26 Jul. 0.0356 0.0315 0.0335
07:01-08:00, Sun., 26 Jul. 0.0370 0.0317 0.0337
06:01-07:00, Sun., 26 Jul. 0.0365 0.0316 0.0336
05:01-06:00, Sun., 26 Jul. 0.0361 0.0318 0.0337
04:01-05:00, Sun., 26 Jul. 0.0370 0.0310 0.0336
03:01-04:00, Sun., 26 Jul. 0.0357 0.0316 0.0335
02:01-03:00, Sun., 26 Jul. 0.0360 0.0304 0.0328
01:01-02:00, Sun., 26 Jul. 0.0353 0.0311 0.0330
00:01-01:00, Sun., 26 Jul. 0.0355 0.0297 0.0329
23:01-24:00, Sat., 25 Jul. 0.0356 0.0297 0.0329
22:01-23:00, Sat., 25 Jul. 0.0361 0.0301 0.0335
21:01-22:00, Sat., 25 Jul. 0.0379 0.0323 0.0349
20:01-21:00, Sat., 25 Jul. 0.0459 0.0354 0.0404
19:01-20:00, Sat., 25 Jul. 0.0481 0.0386 0.0449
18:01-19:00, Sat., 25 Jul. 0.0433 0.0318 0.0379
17:01-18:00, Sat., 25 Jul. 0.0357 0.0311 0.0338
16:01-17:00, Sat., 25 Jul. 0.0356 0.0313 0.0338
15:01-16:00, Sat., 25 Jul. 0.0369 0.0308 0.0341
14:01-15:00, Sat., 25 Jul. 0.0368 0.0315 0.0344
13:01-14:00, Sat., 25 Jul. 0.0368 0.0318 0.0344
12:01-13:00, Sat., 25 Jul. 0.0371 0.0318 0.0342
11:01-12:00, Sat., 25 Jul. 0.0368 0.0318 0.0346
10:01-11:00, Sat., 25 Jul. 0.0368 0.0322 0.0348
09:01-10:00, Sat., 25 Jul. 0.0372 0.0325 0.0347
08:01-09:00, Sat., 25 Jul. 0.0375 0.0325 0.0347
07:01-08:00, Sat., 25 Jul. 0.0370 0.0327 0.0350
06:01-07:00, Sat., 25 Jul. 0.0374 0.0326 0.0349
05:01-06:00, Sat., 25 Jul. 0.0365 0.0326 0.0346
04:01-05:00, Sat., 25 Jul. 0.0360 0.0316 0.0340
03:01-04:00, Sat., 25 Jul. 0.0377 0.0317 0.0343
02:01-03:00, Sat., 25 Jul. 0.0370 0.0317 0.0347
01:01-02:00, Sat., 25 Jul. 0.0369 0.0318 0.0337
00:01-01:00, Sat., 25 Jul. 0.0360 0.0308 0.0337
23:01-24:00, Fri., 24 Jul. 0.0356 0.0308 0.0337
22:01-23:00, Fri., 24 Jul. 0.0358 0.0303 0.0333
21:01-22:00, Fri., 24 Jul. 0.0373 0.0312 0.0340
20:01-21:00, Fri., 24 Jul. 0.0386 0.0328 0.0351
19:01-20:00, Fri., 24 Jul. 0.0406 0.0349 0.0377
18:01-19:00, Fri., 24 Jul. 0.0388 0.0320 0.0344
17:01-18:00, Fri., 24 Jul. 0.0360 0.0308 0.0335
16:01-17:00, Fri., 24 Jul. 0.0365 0.0322 0.0339
15:01-16:00, Fri., 24 Jul. 0.0363 0.0312 0.0339
14:01-15:00, Fri., 24 Jul. 0.0361 0.0316 0.0337
13:01-14:00, Fri., 24 Jul. 0.0370 0.0319 0.0338
12:01-13:00, Fri., 24 Jul. 0.0366 0.0318 0.0341
11:01-12:00, Fri., 24 Jul. 0.0372 0.0312 0.0337
10:01-11:00, Fri., 24 Jul. 0.0362 0.0315 0.0342
09:01-10:00, Fri., 24 Jul. 0.0365 0.0311 0.0342
08:01-09:00, Fri., 24 Jul. 0.0375 0.0322 0.0346
07:01-08:00, Fri., 24 Jul. 0.0377 0.0321 0.0344
06:01-07:00, Fri., 24 Jul. 0.0371 0.0323 0.0346
05:01-06:00, Fri., 24 Jul. 0.0371 0.0324 0.0346
04:01-05:00, Fri., 24 Jul. 0.0374 0.0319 0.0343
03:01-04:00, Fri., 24 Jul. 0.0361 0.0318 0.0340
02:01-03:00, Fri., 24 Jul. 0.0374 0.0316 0.0341
01:01-02:00, Fri., 24 Jul. 0.0369 0.0303 0.0341
00:01-01:00, Fri., 24 Jul. 0.0361 0.0321 0.0340
23:01-24:00, Thu., 23 Jul. 0.0363 0.0315 0.0340
22:01-23:00, Thu., 23 Jul. 0.0370 0.0316 0.0341
21:01-22:00, Thu., 23 Jul. 0.0359 0.0306 0.0339
20:01-21:00, Thu., 23 Jul. 0.0363 0.0315 0.0338
19:01-20:00, Thu., 23 Jul. 0.0361 0.0312 0.0338
18:01-19:00, Thu., 23 Jul. 0.0370 0.0318 0.0340
17:01-18:00, Thu., 23 Jul. 0.0363 0.0315 0.0339
16:01-17:00, Thu., 23 Jul. 0.0356 0.0311 0.0338
15:01-16:00, Thu., 23 Jul. 0.0367 0.0317 0.0342
14:01-15:00, Thu., 23 Jul. 0.0364 0.0313 0.0340
13:01-14:00, Thu., 23 Jul. 0.0363 0.0329 0.0345
12:01-13:00, Thu., 23 Jul. 0.0365 0.0320 0.0340
11:01-12:00, Thu., 23 Jul. 0.0361 0.0323 0.0341
10:01-11:00, Thu., 23 Jul. 0.0371 0.0320 0.0344
09:01-10:00, Thu., 23 Jul. 0.0373 0.0322 0.0348
08:01-09:00, Thu., 23 Jul. 0.0391 0.0327 0.0360
07:01-08:00, Thu., 23 Jul. 0.0398 0.0341 0.0367
06:01-07:00, Thu., 23 Jul. 0.0395 0.0341 0.0369
05:01-06:00, Thu., 23 Jul. 0.0387 0.0332 0.0357
04:01-05:00, Thu., 23 Jul. 0.0370 0.0304 0.0342
03:01-04:00, Thu., 23 Jul. 0.0368 0.0318 0.0340
02:01-03:00, Thu., 23 Jul. 0.0373 0.0318 0.0340
01:01-02:00, Thu., 23 Jul. 0.0369 0.0316 0.0340
00:01-01:00, Thu., 23 Jul. 0.0363 0.0314 0.0339
23:01-24:00, Wed., 22 Jul. 0.0363 0.0319 0.0343
22:01-23:00, Wed., 22 Jul. 0.0366 0.0321 0.0340
21:01-22:00, Wed., 22 Jul. 0.0370 0.0320 0.0343
20:01-21:00, Wed., 22 Jul. 0.0367 0.0318 0.0342