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, Mon., 20 Apr. 0.0363 0.0320 0.0338
16:01-17:00, Mon., 20 Apr. 0.0362 0.0308 0.0337
15:01-16:00, Mon., 20 Apr. 0.0357 0.0320 0.0340
14:01-15:00, Mon., 20 Apr. 0.0373 0.0304 0.0341
13:01-14:00, Mon., 20 Apr. 0.0370 0.0318 0.0340
12:01-13:00, Mon., 20 Apr. 0.0371 0.0315 0.0340
11:01-12:00, Mon., 20 Apr. 0.0360 0.0321 0.0339
10:01-11:00, Mon., 20 Apr. 0.0363 0.0319 0.0341
09:01-10:00, Mon., 20 Apr. 0.0366 0.0324 0.0344
08:01-09:00, Mon., 20 Apr. 0.0363 0.0324 0.0343
07:01-08:00, Mon., 20 Apr. 0.0360 0.0316 0.0342
06:01-07:00, Mon., 20 Apr. 0.0368 0.0322 0.0344
05:01-06:00, Mon., 20 Apr. 0.0367 0.0318 0.0340
04:01-05:00, Mon., 20 Apr. 0.0367 0.0322 0.0344
03:01-04:00, Mon., 20 Apr. 0.0367 0.0324 0.0345
02:01-03:00, Mon., 20 Apr. 0.0363 0.0315 0.0340
01:01-02:00, Mon., 20 Apr. 0.0355 0.0318 0.0338
00:01-01:00, Mon., 20 Apr. 0.0364 0.0317 0.0338
23:01-24:00, Sun., 19 Apr. 0.0355 0.0316 0.0338
22:01-23:00, Sun., 19 Apr. 0.0370 0.0319 0.0342
21:01-22:00, Sun., 19 Apr. 0.0364 0.0311 0.0338
20:01-21:00, Sun., 19 Apr. 0.0358 0.0310 0.0334
19:01-20:00, Sun., 19 Apr. 0.0353 0.0313 0.0336
18:01-19:00, Sun., 19 Apr. 0.0355 0.0308 0.0335
17:01-18:00, Sun., 19 Apr. 0.0358 0.0311 0.0337
16:01-17:00, Sun., 19 Apr. 0.0357 0.0312 0.0338
15:01-16:00, Sun., 19 Apr. 0.0367 0.0311 0.0341
14:01-15:00, Sun., 19 Apr. 0.0363 0.0318 0.0344
13:01-14:00, Sun., 19 Apr. 0.0361 0.0318 0.0344
12:01-13:00, Sun., 19 Apr. 0.0376 0.0311 0.0342
11:01-12:00, Sun., 19 Apr. 0.0377 0.0323 0.0343
10:01-11:00, Sun., 19 Apr. 0.0368 0.0320 0.0344
09:01-10:00, Sun., 19 Apr. 0.0379 0.0315 0.0348
08:01-09:00, Sun., 19 Apr. 0.0376 0.0329 0.0351
07:01-08:00, Sun., 19 Apr. 0.0376 0.0330 0.0347
06:01-07:00, Sun., 19 Apr. 0.0364 0.0322 0.0344
05:01-06:00, Sun., 19 Apr. 0.0360 0.0311 0.0338
04:01-05:00, Sun., 19 Apr. 0.0370 0.0312 0.0340
03:01-04:00, Sun., 19 Apr. 0.0370 0.0314 0.0337
02:01-03:00, Sun., 19 Apr. 0.0359 0.0309 0.0336
01:01-02:00, Sun., 19 Apr. 0.0353 0.0315 0.0333
00:01-01:00, Sun., 19 Apr. 0.0356 0.0313 0.0334
23:01-24:00, Sat., 18 Apr. 0.0353 0.0311 0.0334
22:01-23:00, Sat., 18 Apr. 0.0356 0.0312 0.0334
21:01-22:00, Sat., 18 Apr. 0.0354 0.0297 0.0329
20:01-21:00, Sat., 18 Apr. 0.0353 0.0302 0.0329
19:01-20:00, Sat., 18 Apr. 0.0354 0.0304 0.0332
18:01-19:00, Sat., 18 Apr. 0.0365 0.0312 0.0330
17:01-18:00, Sat., 18 Apr. 0.0357 0.0305 0.0331
16:01-17:00, Sat., 18 Apr. 0.0351 0.0304 0.0333
15:01-16:00, Sat., 18 Apr. 0.0368 0.0310 0.0337
14:01-15:00, Sat., 18 Apr. 0.0356 0.0306 0.0334
13:01-14:00, Sat., 18 Apr. 0.0375 0.0315 0.0336
12:01-13:00, Sat., 18 Apr. 0.0350 0.0318 0.0334
11:01-12:00, Sat., 18 Apr. 0.0358 0.0304 0.0334
10:01-11:00, Sat., 18 Apr. 0.0350 0.0307 0.0330
09:01-10:00, Sat., 18 Apr. 0.0353 0.0311 0.0335
08:01-09:00, Sat., 18 Apr. 0.0362 0.0313 0.0337
07:01-08:00, Sat., 18 Apr. 0.0367 0.0314 0.0338
06:01-07:00, Sat., 18 Apr. 0.0365 0.0319 0.0343
05:01-06:00, Sat., 18 Apr. 0.0366 0.0317 0.0345
04:01-05:00, Sat., 18 Apr. 0.0358 0.0304 0.0336
03:01-04:00, Sat., 18 Apr. 0.0349 0.0310 0.0334
02:01-03:00, Sat., 18 Apr. 0.0356 0.0304 0.0330
01:01-02:00, Sat., 18 Apr. 0.0351 0.0306 0.0327
00:01-01:00, Sat., 18 Apr. 0.0360 0.0304 0.0328
23:01-24:00, Fri., 17 Apr. 0.0349 0.0300 0.0325
22:01-23:00, Fri., 17 Apr. 0.0350 0.0292 0.0325
21:01-22:00, Fri., 17 Apr. 0.0358 0.0299 0.0326
20:01-21:00, Fri., 17 Apr. 0.0358 0.0304 0.0327
19:01-20:00, Fri., 17 Apr. 0.0346 0.0308 0.0328
18:01-19:00, Fri., 17 Apr. 0.0347 0.0306 0.0331
17:01-18:00, Fri., 17 Apr. 0.0360 0.0307 0.0332
16:01-17:00, Fri., 17 Apr. 0.0355 0.0300 0.0334
15:01-16:00, Fri., 17 Apr. 0.0353 0.0311 0.0334
14:01-15:00, Fri., 17 Apr. 0.0374 0.0308 0.0334
13:01-14:00, Fri., 17 Apr. 0.0365 0.0305 0.0331
12:01-13:00, Fri., 17 Apr. 0.0353 0.0312 0.0333
11:01-12:00, Fri., 17 Apr. 0.0359 0.0313 0.0333
10:01-11:00, Fri., 17 Apr. 0.0347 0.0304 0.0327
09:01-10:00, Fri., 17 Apr. 0.0357 0.0307 0.0330
08:01-09:00, Fri., 17 Apr. 0.0358 0.0304 0.0330
07:01-08:00, Fri., 17 Apr. 0.0353 0.0311 0.0331
06:01-07:00, Fri., 17 Apr. 0.0354 0.0303 0.0328
05:01-06:00, Fri., 17 Apr. 0.0343 0.0308 0.0328
04:01-05:00, Fri., 17 Apr. 0.0354 0.0308 0.0328
03:01-04:00, Fri., 17 Apr. 0.0355 0.0308 0.0330
02:01-03:00, Fri., 17 Apr. 0.0353 0.0309 0.0329
01:01-02:00, Fri., 17 Apr. 0.0349 0.0305 0.0330
00:01-01:00, Fri., 17 Apr. 0.0346 0.0308 0.0328
23:01-24:00, Thu., 16 Apr. 0.0347 0.0302 0.0329
22:01-23:00, Thu., 16 Apr. 0.0353 0.0306 0.0327
21:01-22:00, Thu., 16 Apr. 0.0346 0.0305 0.0326
20:01-21:00, Thu., 16 Apr. 0.0348 0.0304 0.0327
19:01-20:00, Thu., 16 Apr. 0.0358 0.0308 0.0329
18:01-19:00, Thu., 16 Apr. 0.0349 0.0311 0.0332
17:01-18:00, Thu., 16 Apr. 0.0356 0.0311 0.0336
16:01-17:00, Thu., 16 Apr. 0.0355 0.0311 0.0338
15:01-16:00, Thu., 16 Apr. 0.0358 0.0322 0.0341
14:01-15:00, Thu., 16 Apr. 0.0352 0.0312 0.0334
13:01-14:00, Thu., 16 Apr. 0.0367 0.0313 0.0337
12:01-13:00, Thu., 16 Apr. 0.0365 0.0312 0.0338
11:01-12:00, Thu., 16 Apr. 0.0362 0.0311 0.0337
10:01-11:00, Thu., 16 Apr. 0.0355 0.0313 0.0336
09:01-10:00, Thu., 16 Apr. 0.0355 0.0310 0.0329
08:01-09:00, Thu., 16 Apr. 0.0363 0.0311 0.0334
07:01-08:00, Thu., 16 Apr. 0.0350 0.0309 0.0331
06:01-07:00, Thu., 16 Apr. 0.0354 0.0308 0.0332
05:01-06:00, Thu., 16 Apr. 0.0355 0.0304 0.0331
04:01-05:00, Thu., 16 Apr. 0.0361 0.0302 0.0333
03:01-04:00, Thu., 16 Apr. 0.0364 0.0323 0.0342
02:01-03:00, Thu., 16 Apr. 0.0385 0.0330 0.0355
01:01-02:00, Thu., 16 Apr. 0.0384 0.0346 0.0366
00:01-01:00, Thu., 16 Apr. 0.0382 0.0333 0.0361
23:01-24:00, Wed., 15 Apr. 0.0405 0.0338 0.0366
22:01-23:00, Wed., 15 Apr. 0.0411 0.0356 0.0384
21:01-22:00, Wed., 15 Apr. 0.0411 0.0355 0.0386
20:01-21:00, Wed., 15 Apr. 0.0454 0.0376 0.0413
19:01-20:00, Wed., 15 Apr. 0.0469 0.0364 0.0418
18:01-19:00, Wed., 15 Apr. 0.0403 0.0346 0.0372
17:01-18:00, Wed., 15 Apr. 0.0377 0.0322 0.0343
16:01-17:00, Wed., 15 Apr. 0.0356 0.0315 0.0338
15:01-16:00, Wed., 15 Apr. 0.0356 0.0322 0.0339
14:01-15:00, Wed., 15 Apr. 0.0360 0.0316 0.0337
13:01-14:00, Wed., 15 Apr. 0.0363 0.0322 0.0341
12:01-13:00, Wed., 15 Apr. 0.0361 0.0319 0.0341
11:01-12:00, Wed., 15 Apr. 0.0359 0.0313 0.0337
10:01-11:00, Wed., 15 Apr. 0.0360 0.0317 0.0340
09:01-10:00, Wed., 15 Apr. 0.0369 0.0320 0.0341
08:01-09:00, Wed., 15 Apr. 0.0360 0.0326 0.0344
07:01-08:00, Wed., 15 Apr. 0.0374 0.0323 0.0343
06:01-07:00, Wed., 15 Apr. 0.0364 0.0323 0.0345
05:01-06:00, Wed., 15 Apr. 0.0362 0.0315 0.0344
04:01-05:00, Wed., 15 Apr. 0.0367 0.0318 0.0337
03:01-04:00, Wed., 15 Apr. 0.0363 0.0312 0.0333
02:01-03:00, Wed., 15 Apr. 0.0355 0.0315 0.0334
01:01-02:00, Wed., 15 Apr. 0.0351 0.0318 0.0332
00:01-01:00, Wed., 15 Apr. 0.0353 0.0315 0.0333
23:01-24:00, Tue., 14 Apr. 0.0361 0.0317 0.0338
22:01-23:00, Tue., 14 Apr. 0.0355 0.0311 0.0337
21:01-22:00, Tue., 14 Apr. 0.0367 0.0311 0.0338
20:01-21:00, Tue., 14 Apr. 0.0359 0.0318 0.0338
19:01-20:00, Tue., 14 Apr. 0.0360 0.0318 0.0338
18:01-19:00, Tue., 14 Apr. 0.0371 0.0313 0.0333
17:01-18:00, Tue., 14 Apr. 0.0362 0.0307 0.0339
16:01-17:00, Tue., 14 Apr. 0.0356 0.0315 0.0337
15:01-16:00, Tue., 14 Apr. 0.0356 0.0314 0.0337
14:01-15:00, Tue., 14 Apr. 0.0367 0.0309 0.0336
13:01-14:00, Tue., 14 Apr. 0.0358 0.0314 0.0339
12:01-13:00, Tue., 14 Apr. 0.0360 0.0316 0.0342
11:01-12:00, Tue., 14 Apr. 0.0368 0.0317 0.0345
10:01-11:00, Tue., 14 Apr. 0.0383 0.0326 0.0352
09:01-10:00, Tue., 14 Apr. 0.0370 0.0324 0.0345
08:01-09:00, Tue., 14 Apr. 0.0374 0.0321 0.0343
07:01-08:00, Tue., 14 Apr. 0.0370 0.0324 0.0346
06:01-07:00, Tue., 14 Apr. 0.0371 0.0325 0.0348
05:01-06:00, Tue., 14 Apr. 0.0378 0.0328 0.0349
04:01-05:00, Tue., 14 Apr. 0.0368 0.0319 0.0348
03:01-04:00, Tue., 14 Apr. 0.0369 0.0322 0.0347
02:01-03:00, Tue., 14 Apr. 0.0374 0.0320 0.0347
01:01-02:00, Tue., 14 Apr. 0.0373 0.0329 0.0348
00:01-01:00, Tue., 14 Apr. 0.0364 0.0322 0.0342
23:01-24:00, Mon., 13 Apr. 0.0365 0.0314 0.0333
22:01-23:00, Mon., 13 Apr. 0.0354 0.0311 0.0337
21:01-22:00, Mon., 13 Apr. 0.0357 0.0314 0.0336
20:01-21:00, Mon., 13 Apr. 0.0365 0.0315 0.0335
19:01-20:00, Mon., 13 Apr. 0.0359 0.0310 0.0338
18:01-19:00, Mon., 13 Apr. 0.0371 0.0318 0.0339
17:01-18:00, Mon., 13 Apr. 0.0366 0.0304 0.0338
16:01-17:00, Mon., 13 Apr. 0.0363 0.0320 0.0341
15:01-16:00, Mon., 13 Apr. 0.0367 0.0322 0.0341
14:01-15:00, Mon., 13 Apr. 0.0371 0.0312 0.0337
13:01-14:00, Mon., 13 Apr. 0.0356 0.0310 0.0338
12:01-13:00, Mon., 13 Apr. 0.0365 0.0304 0.0339
11:01-12:00, Mon., 13 Apr. 0.0368 0.0309 0.0344
10:01-11:00, Mon., 13 Apr. 0.0365 0.0329 0.0344
09:01-10:00, Mon., 13 Apr. 0.0363 0.0322 0.0345
08:01-09:00, Mon., 13 Apr. 0.0367 0.0327 0.0345
07:01-08:00, Mon., 13 Apr. 0.0367 0.0325 0.0346
06:01-07:00, Mon., 13 Apr. 0.0367 0.0321 0.0347
05:01-06:00, Mon., 13 Apr. 0.0369 0.0322 0.0346
04:01-05:00, Mon., 13 Apr. 0.0365 0.0322 0.0346
03:01-04:00, Mon., 13 Apr. 0.0367 0.0320 0.0344
02:01-03:00, Mon., 13 Apr. 0.0363 0.0314 0.0343
01:01-02:00, Mon., 13 Apr. 0.0370 0.0318 0.0338
00:01-01:00, Mon., 13 Apr. 0.0360 0.0324 0.0340
23:01-24:00, Sun., 12 Apr. 0.0357 0.0314 0.0337
22:01-23:00, Sun., 12 Apr. 0.0363 0.0315 0.0335
21:01-22:00, Sun., 12 Apr. 0.0358 0.0311 0.0334
20:01-21:00, Sun., 12 Apr. 0.0360 0.0315 0.0337
19:01-20:00, Sun., 12 Apr. 0.0362 0.0313 0.0336
18:01-19:00, Sun., 12 Apr. 0.0357 0.0310 0.0338
17:01-18:00, Sun., 12 Apr. 0.0369 0.0321 0.0339
16:01-17:00, Sun., 12 Apr. 0.0366 0.0318 0.0342
15:01-16:00, Sun., 12 Apr. 0.0361 0.0317 0.0343
14:01-15:00, Sun., 12 Apr. 0.0374 0.0318 0.0342
13:01-14:00, Sun., 12 Apr. 0.0363 0.0314 0.0342
12:01-13:00, Sun., 12 Apr. 0.0372 0.0318 0.0342
11:01-12:00, Sun., 12 Apr. 0.0363 0.0312 0.0340
10:01-11:00, Sun., 12 Apr. 0.0366 0.0315 0.0338
09:01-10:00, Sun., 12 Apr. 0.0360 0.0315 0.0336
08:01-09:00, Sun., 12 Apr. 0.0363 0.0309 0.0335
07:01-08:00, Sun., 12 Apr. 0.0360 0.0317 0.0338
06:01-07:00, Sun., 12 Apr. 0.0359 0.0318 0.0336
05:01-06:00, Sun., 12 Apr. 0.0355 0.0313 0.0334
04:01-05:00, Sun., 12 Apr. 0.0356 0.0313 0.0335
03:01-04:00, Sun., 12 Apr. 0.0355 0.0309 0.0331
02:01-03:00, Sun., 12 Apr. 0.0364 0.0305 0.0334
01:01-02:00, Sun., 12 Apr. 0.0360 0.0317 0.0341
00:01-01:00, Sun., 12 Apr. 0.0367 0.0319 0.0336
23:01-24:00, Sat., 11 Apr. 0.0361 0.0317 0.0336
22:01-23:00, Sat., 11 Apr. 0.0361 0.0317 0.0338
21:01-22:00, Sat., 11 Apr. 0.0365 0.0317 0.0344
20:01-21:00, Sat., 11 Apr. 0.0361 0.0318 0.0339
19:01-20:00, Sat., 11 Apr. 0.0359 0.0319 0.0341
18:01-19:00, Sat., 11 Apr. 0.0372 0.0321 0.0344
17:01-18:00, Sat., 11 Apr. 0.0372 0.0321 0.0344
16:01-17:00, Sat., 11 Apr. 0.0369 0.0318 0.0346
15:01-16:00, Sat., 11 Apr. 0.0362 0.0328 0.0346
14:01-15:00, Sat., 11 Apr. 0.0374 0.0316 0.0343
13:01-14:00, Sat., 11 Apr. 0.0374 0.0329 0.0348
12:01-13:00, Sat., 11 Apr. 0.0370 0.0311 0.0346
11:01-12:00, Sat., 11 Apr. 0.0369 0.0318 0.0346
10:01-11:00, Sat., 11 Apr. 0.0375 0.0330 0.0350
09:01-10:00, Sat., 11 Apr. 0.0374 0.0325 0.0346
08:01-09:00, Sat., 11 Apr. 0.0373 0.0322 0.0347
07:01-08:00, Sat., 11 Apr. 0.0375 0.0328 0.0353
06:01-07:00, Sat., 11 Apr. 0.0378 0.0329 0.0353
05:01-06:00, Sat., 11 Apr. 0.0377 0.0325 0.0346
04:01-05:00, Sat., 11 Apr. 0.0364 0.0321 0.0344
03:01-04:00, Sat., 11 Apr. 0.0366 0.0325 0.0342
02:01-03:00, Sat., 11 Apr. 0.0362 0.0304 0.0339
01:01-02:00, Sat., 11 Apr. 0.0370 0.0315 0.0339
00:01-01:00, Sat., 11 Apr. 0.0353 0.0315 0.0335
23:01-24:00, Fri., 10 Apr. 0.0377 0.0314 0.0339
22:01-23:00, Fri., 10 Apr. 0.0358 0.0312 0.0338
21:01-22:00, Fri., 10 Apr. 0.0389 0.0324 0.0351
20:01-21:00, Fri., 10 Apr. 0.0440 0.0341 0.0393
19:01-20:00, Fri., 10 Apr. 0.0461 0.0357 0.0416
18:01-19:00, Fri., 10 Apr. 0.0392 0.0345 0.0363