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
12:01-13:00, Sun., 23 Feb. 0.0362 0.0314 0.0342
11:01-12:00, Sun., 23 Feb. 0.0375 0.0325 0.0350
10:01-11:00, Sun., 23 Feb. 0.0377 0.0334 0.0351
09:01-10:00, Sun., 23 Feb. 0.0377 0.0327 0.0353
08:01-09:00, Sun., 23 Feb. 0.0370 0.0323 0.0349
07:01-08:00, Sun., 23 Feb. 0.0370 0.0318 0.0351
06:01-07:00, Sun., 23 Feb. 0.0379 0.0325 0.0352
05:01-06:00, Sun., 23 Feb. 0.0377 0.0333 0.0352
04:01-05:00, Sun., 23 Feb. 0.0391 0.0332 0.0358
03:01-04:00, Sun., 23 Feb. 0.0386 0.0334 0.0360
02:01-03:00, Sun., 23 Feb. 0.0376 0.0329 0.0352
01:01-02:00, Sun., 23 Feb. 0.0386 0.0322 0.0354
00:01-01:00, Sun., 23 Feb. 0.0376 0.0331 0.0358
23:01-24:00, Sat., 22 Feb. 0.0383 0.0334 0.0356
22:01-23:00, Sat., 22 Feb. 0.0377 0.0326 0.0350
21:01-22:00, Sat., 22 Feb. 0.0388 0.0325 0.0349
20:01-21:00, Sat., 22 Feb. 0.0371 0.0331 0.0347
19:01-20:00, Sat., 22 Feb. 0.0381 0.0321 0.0345
18:01-19:00, Sat., 22 Feb. 0.0372 0.0318 0.0346
17:01-18:00, Sat., 22 Feb. 0.0375 0.0326 0.0349
16:01-17:00, Sat., 22 Feb. 0.0388 0.0322 0.0350
15:01-16:00, Sat., 22 Feb. 0.0371 0.0320 0.0353
14:01-15:00, Sat., 22 Feb. 0.0376 0.0331 0.0350
13:01-14:00, Sat., 22 Feb. 0.0391 0.0345 0.0366
12:01-13:00, Sat., 22 Feb. 0.0394 0.0321 0.0353
11:01-12:00, Sat., 22 Feb. 0.0374 0.0322 0.0348
10:01-11:00, Sat., 22 Feb. 0.0371 0.0312 0.0349
09:01-10:00, Sat., 22 Feb. 0.0380 0.0319 0.0353
08:01-09:00, Sat., 22 Feb. 0.0376 0.0332 0.0356
07:01-08:00, Sat., 22 Feb. 0.0371 0.0325 0.0354
06:01-07:00, Sat., 22 Feb. 0.0378 0.0337 0.0355
05:01-06:00, Sat., 22 Feb. 0.0380 0.0329 0.0355
04:01-05:00, Sat., 22 Feb. 0.0381 0.0334 0.0355
03:01-04:00, Sat., 22 Feb. 0.0391 0.0334 0.0356
02:01-03:00, Sat., 22 Feb. 0.0368 0.0320 0.0346
01:01-02:00, Sat., 22 Feb. 0.0374 0.0320 0.0346
00:01-01:00, Sat., 22 Feb. 0.0370 0.0320 0.0345
23:01-24:00, Fri., 21 Feb. 0.0368 0.0323 0.0345
22:01-23:00, Fri., 21 Feb. 0.0373 0.0326 0.0344
21:01-22:00, Fri., 21 Feb. 0.0377 0.0329 0.0348
20:01-21:00, Fri., 21 Feb. 0.0378 0.0311 0.0347
19:01-20:00, Fri., 21 Feb. 0.0370 0.0322 0.0343
18:01-19:00, Fri., 21 Feb. 0.0359 0.0318 0.0341
17:01-18:00, Fri., 21 Feb. 0.0363 0.0321 0.0340
16:01-17:00, Fri., 21 Feb. 0.0362 0.0321 0.0343
15:01-16:00, Fri., 21 Feb. 0.0359 0.0314 0.0342
14:01-15:00, Fri., 21 Feb. 0.0367 0.0324 0.0341
13:01-14:00, Fri., 21 Feb. 0.0367 0.0319 0.0344
12:01-13:00, Fri., 21 Feb. 0.0370 0.0320 0.0348
11:01-12:00, Fri., 21 Feb. 0.0364 0.0318 0.0346
10:01-11:00, Fri., 21 Feb. 0.0373 0.0327 0.0350
09:01-10:00, Fri., 21 Feb. 0.0384 0.0338 0.0358
08:01-09:00, Fri., 21 Feb. 0.0387 0.0341 0.0361
07:01-08:00, Fri., 21 Feb. 0.0382 0.0333 0.0357
06:01-07:00, Fri., 21 Feb. 0.0385 0.0339 0.0361
05:01-06:00, Fri., 21 Feb. 0.0381 0.0337 0.0356
04:01-05:00, Fri., 21 Feb. 0.0391 0.0330 0.0358
03:01-04:00, Fri., 21 Feb. 0.0384 0.0340 0.0358
02:01-03:00, Fri., 21 Feb. 0.0380 0.0336 0.0355
01:01-02:00, Fri., 21 Feb. 0.0381 0.0331 0.0356
00:01-01:00, Fri., 21 Feb. 0.0371 0.0317 0.0347
23:01-24:00, Thu., 20 Feb. 0.0381 0.0323 0.0347
22:01-23:00, Thu., 20 Feb. 0.0378 0.0326 0.0349
21:01-22:00, Thu., 20 Feb. 0.0377 0.0313 0.0347
20:01-21:00, Thu., 20 Feb. 0.0364 0.0321 0.0343
19:01-20:00, Thu., 20 Feb. 0.0370 0.0322 0.0344
18:01-19:00, Thu., 20 Feb. 0.0361 0.0315 0.0339
17:01-18:00, Thu., 20 Feb. 0.0360 0.0323 0.0341
16:01-17:00, Thu., 20 Feb. 0.0366 0.0319 0.0340
15:01-16:00, Thu., 20 Feb. 0.0360 0.0299 0.0339
14:01-15:00, Thu., 20 Feb. 0.0359 0.0310 0.0336
13:01-14:00, Thu., 20 Feb. 0.0369 0.0324 0.0342
12:01-13:00, Thu., 20 Feb. 0.0361 0.0319 0.0341
11:01-12:00, Thu., 20 Feb. 0.0369 0.0315 0.0348
10:01-11:00, Thu., 20 Feb. 0.0367 0.0331 0.0348
09:01-10:00, Thu., 20 Feb. 0.0366 0.0325 0.0347
08:01-09:00, Thu., 20 Feb. 0.0367 0.0322 0.0344
07:01-08:00, Thu., 20 Feb. 0.0375 0.0324 0.0347
06:01-07:00, Thu., 20 Feb. 0.0368 0.0328 0.0349
05:01-06:00, Thu., 20 Feb. 0.0370 0.0328 0.0351
04:01-05:00, Thu., 20 Feb. 0.0374 0.0317 0.0348
03:01-04:00, Thu., 20 Feb. 0.0367 0.0330 0.0349
02:01-03:00, Thu., 20 Feb. 0.0374 0.0311 0.0347
01:01-02:00, Thu., 20 Feb. 0.0374 0.0316 0.0345
00:01-01:00, Thu., 20 Feb. 0.0367 0.0315 0.0349
23:01-24:00, Wed., 19 Feb. 0.0371 0.0321 0.0345
22:01-23:00, Wed., 19 Feb. 0.0384 0.0324 0.0347
21:01-22:00, Wed., 19 Feb. 0.0365 0.0322 0.0344
20:01-21:00, Wed., 19 Feb. 0.0366 0.0323 0.0348
19:01-20:00, Wed., 19 Feb. 0.0380 0.0319 0.0348
18:01-19:00, Wed., 19 Feb. 0.0370 0.0319 0.0347
17:01-18:00, Wed., 19 Feb. 0.0370 0.0327 0.0349
16:01-17:00, Wed., 19 Feb. 0.0373 0.0329 0.0350
15:01-16:00, Wed., 19 Feb. 0.0374 0.0328 0.0346
14:01-15:00, Wed., 19 Feb. 0.0370 0.0329 0.0344
13:01-14:00, Wed., 19 Feb. 0.0368 0.0318 0.0342
12:01-13:00, Wed., 19 Feb. 0.0369 0.0321 0.0345
11:01-12:00, Wed., 19 Feb. 0.0367 0.0325 0.0346
10:01-11:00, Wed., 19 Feb. 0.0365 0.0329 0.0348
09:01-10:00, Wed., 19 Feb. 0.0377 0.0330 0.0354
08:01-09:00, Wed., 19 Feb. 0.0379 0.0321 0.0350
07:01-08:00, Wed., 19 Feb. 0.0383 0.0324 0.0352
06:01-07:00, Wed., 19 Feb. 0.0385 0.0337 0.0355
05:01-06:00, Wed., 19 Feb. 0.0384 0.0337 0.0357
04:01-05:00, Wed., 19 Feb. 0.0385 0.0336 0.0364
03:01-04:00, Wed., 19 Feb. 0.0384 0.0339 0.0364
02:01-03:00, Wed., 19 Feb. 0.0384 0.0336 0.0357
01:01-02:00, Wed., 19 Feb. 0.0374 0.0333 0.0356
00:01-01:00, Wed., 19 Feb. 0.0380 0.0333 0.0358
23:01-24:00, Tue., 18 Feb. 0.0384 0.0329 0.0353
22:01-23:00, Tue., 18 Feb. 0.0384 0.0332 0.0353
21:01-22:00, Tue., 18 Feb. 0.0374 0.0324 0.0350
20:01-21:00, Tue., 18 Feb. 0.0379 0.0324 0.0351
19:01-20:00, Tue., 18 Feb. 0.0378 0.0325 0.0352
18:01-19:00, Tue., 18 Feb. 0.0371 0.0328 0.0349
17:01-18:00, Tue., 18 Feb. 0.0365 0.0325 0.0348
16:01-17:00, Tue., 18 Feb. 0.0367 0.0319 0.0347
15:01-16:00, Tue., 18 Feb. 0.0376 0.0327 0.0350
14:01-15:00, Tue., 18 Feb. 0.0375 0.0329 0.0348
13:01-14:00, Tue., 18 Feb. 0.0381 0.0323 0.0351
12:01-13:00, Tue., 18 Feb. 0.0377 0.0329 0.0353
11:01-12:00, Tue., 18 Feb. 0.0377 0.0331 0.0357
10:01-11:00, Tue., 18 Feb. 0.0388 0.0330 0.0356
09:01-10:00, Tue., 18 Feb. 0.0377 0.0329 0.0356
08:01-09:00, Tue., 18 Feb. 0.0374 0.0322 0.0352
07:01-08:00, Tue., 18 Feb. 0.0375 0.0337 0.0355
06:01-07:00, Tue., 18 Feb. 0.0378 0.0322 0.0354
05:01-06:00, Tue., 18 Feb. 0.0376 0.0329 0.0354
04:01-05:00, Tue., 18 Feb. 0.0379 0.0331 0.0354
03:01-04:00, Tue., 18 Feb. 0.0371 0.0330 0.0357
02:01-03:00, Tue., 18 Feb. 0.0388 0.0330 0.0361
01:01-02:00, Tue., 18 Feb. 0.0381 0.0327 0.0357
00:01-01:00, Tue., 18 Feb. 0.0380 0.0325 0.0357
23:01-24:00, Mon., 17 Feb. 0.0377 0.0331 0.0357
22:01-23:00, Mon., 17 Feb. 0.0384 0.0332 0.0357
21:01-22:00, Mon., 17 Feb. 0.0382 0.0328 0.0354
20:01-21:00, Mon., 17 Feb. 0.0378 0.0328 0.0356
19:01-20:00, Mon., 17 Feb. 0.0381 0.0322 0.0354
18:01-19:00, Mon., 17 Feb. 0.0382 0.0339 0.0358
17:01-18:00, Mon., 17 Feb. 0.0375 0.0333 0.0354
16:01-17:00, Mon., 17 Feb. 0.0381 0.0329 0.0350
15:01-16:00, Mon., 17 Feb. 0.0371 0.0316 0.0343
14:01-15:00, Mon., 17 Feb. 0.0369 0.0327 0.0343
13:01-14:00, Mon., 17 Feb. 0.0369 0.0315 0.0342
12:01-13:00, Mon., 17 Feb. 0.0362 0.0324 0.0342
11:01-12:00, Mon., 17 Feb. 0.0375 0.0325 0.0346
10:01-11:00, Mon., 17 Feb. 0.0376 0.0328 0.0350
09:01-10:00, Mon., 17 Feb. 0.0383 0.0326 0.0352
08:01-09:00, Mon., 17 Feb. 0.0374 0.0331 0.0354
07:01-08:00, Mon., 17 Feb. 0.0374 0.0342 0.0356
06:01-07:00, Mon., 17 Feb. 0.0385 0.0329 0.0355
05:01-06:00, Mon., 17 Feb. 0.0373 0.0326 0.0353
04:01-05:00, Mon., 17 Feb. 0.0377 0.0329 0.0352
03:01-04:00, Mon., 17 Feb. 0.0389 0.0329 0.0352
02:01-03:00, Mon., 17 Feb. 0.0374 0.0326 0.0351
01:01-02:00, Mon., 17 Feb. 0.0369 0.0324 0.0348
00:01-01:00, Mon., 17 Feb. 0.0380 0.0325 0.0351
23:01-24:00, Sun., 16 Feb. 0.0374 0.0329 0.0352
22:01-23:00, Sun., 16 Feb. 0.0378 0.0329 0.0350
21:01-22:00, Sun., 16 Feb. 0.0375 0.0326 0.0344
20:01-21:00, Sun., 16 Feb. 0.0364 0.0322 0.0340
19:01-20:00, Sun., 16 Feb. 0.0362 0.0315 0.0339
18:01-19:00, Sun., 16 Feb. 0.0360 0.0311 0.0336
17:01-18:00, Sun., 16 Feb. 0.0371 0.0311 0.0336
16:01-17:00, Sun., 16 Feb. 0.0369 0.0321 0.0339
15:01-16:00, Sun., 16 Feb. 0.0359 0.0312 0.0341
14:01-15:00, Sun., 16 Feb. 0.0368 0.0322 0.0341
13:01-14:00, Sun., 16 Feb. 0.0362 0.0311 0.0342
12:01-13:00, Sun., 16 Feb. 0.0375 0.0322 0.0344
11:01-12:00, Sun., 16 Feb. 0.0369 0.0325 0.0345
10:01-11:00, Sun., 16 Feb. 0.0366 0.0322 0.0347
09:01-10:00, Sun., 16 Feb. 0.0377 0.0331 0.0352
08:01-09:00, Sun., 16 Feb. 0.0373 0.0327 0.0350
07:01-08:00, Sun., 16 Feb. 0.0376 0.0325 0.0349
06:01-07:00, Sun., 16 Feb. 0.0380 0.0329 0.0352
05:01-06:00, Sun., 16 Feb. 0.0381 0.0329 0.0352
04:01-05:00, Sun., 16 Feb. 0.0377 0.0325 0.0351
03:01-04:00, Sun., 16 Feb. 0.0369 0.0322 0.0347
02:01-03:00, Sun., 16 Feb. 0.0370 0.0319 0.0345
01:01-02:00, Sun., 16 Feb. 0.0384 0.0326 0.0345
00:01-01:00, Sun., 16 Feb. 0.0370 0.0327 0.0347
23:01-24:00, Sat., 15 Feb. 0.0367 0.0311 0.0340
22:01-23:00, Sat., 15 Feb. 0.0360 0.0308 0.0337
21:01-22:00, Sat., 15 Feb. 0.0364 0.0319 0.0336
20:01-21:00, Sat., 15 Feb. 0.0360 0.0312 0.0338
19:01-20:00, Sat., 15 Feb. 0.0363 0.0313 0.0335
18:01-19:00, Sat., 15 Feb. 0.0357 0.0320 0.0337
17:01-18:00, Sat., 15 Feb. 0.0363 0.0315 0.0337
16:01-17:00, Sat., 15 Feb. 0.0383 0.0315 0.0338
15:01-16:00, Sat., 15 Feb. 0.0367 0.0318 0.0337
14:01-15:00, Sat., 15 Feb. 0.0370 0.0311 0.0338
13:01-14:00, Sat., 15 Feb. 0.0360 0.0317 0.0339
12:01-13:00, Sat., 15 Feb. 0.0356 0.0321 0.0339
11:01-12:00, Sat., 15 Feb. 0.0379 0.0322 0.0345
10:01-11:00, Sat., 15 Feb. 0.0375 0.0322 0.0351
09:01-10:00, Sat., 15 Feb. 0.0372 0.0335 0.0355
08:01-09:00, Sat., 15 Feb. 0.0383 0.0326 0.0358
07:01-08:00, Sat., 15 Feb. 0.0399 0.0341 0.0363
06:01-07:00, Sat., 15 Feb. 0.0387 0.0338 0.0358
05:01-06:00, Sat., 15 Feb. 0.0390 0.0342 0.0364
04:01-05:00, Sat., 15 Feb. 0.0395 0.0341 0.0366
03:01-04:00, Sat., 15 Feb. 0.0381 0.0329 0.0355
02:01-03:00, Sat., 15 Feb. 0.0381 0.0328 0.0355
01:01-02:00, Sat., 15 Feb. 0.0384 0.0336 0.0355
00:01-01:00, Sat., 15 Feb. 0.0374 0.0335 0.0351
23:01-24:00, Fri., 14 Feb. 0.0364 0.0325 0.0348
22:01-23:00, Fri., 14 Feb. 0.0370 0.0318 0.0348
21:01-22:00, Fri., 14 Feb. 0.0369 0.0308 0.0343
20:01-21:00, Fri., 14 Feb. 0.0366 0.0318 0.0339
19:01-20:00, Fri., 14 Feb. 0.0373 0.0315 0.0339
18:01-19:00, Fri., 14 Feb. 0.0363 0.0322 0.0339
17:01-18:00, Fri., 14 Feb. 0.0363 0.0320 0.0340
16:01-17:00, Fri., 14 Feb. 0.0364 0.0315 0.0340
15:01-16:00, Fri., 14 Feb. 0.0355 0.0314 0.0338
14:01-15:00, Fri., 14 Feb. 0.0365 0.0321 0.0342
13:01-14:00, Fri., 14 Feb. 0.0365 0.0320 0.0340
12:01-13:00, Fri., 14 Feb. 0.0367 0.0319 0.0344
11:01-12:00, Fri., 14 Feb. 0.0377 0.0322 0.0344
10:01-11:00, Fri., 14 Feb. 0.0381 0.0325 0.0348
09:01-10:00, Fri., 14 Feb. 0.0377 0.0322 0.0349
08:01-09:00, Fri., 14 Feb. 0.0380 0.0326 0.0356
07:01-08:00, Fri., 14 Feb. 0.0384 0.0335 0.0357
06:01-07:00, Fri., 14 Feb. 0.0391 0.0333 0.0358
05:01-06:00, Fri., 14 Feb. 0.0381 0.0336 0.0356
04:01-05:00, Fri., 14 Feb. 0.0384 0.0336 0.0357
03:01-04:00, Fri., 14 Feb. 0.0384 0.0321 0.0355
02:01-03:00, Fri., 14 Feb. 0.0384 0.0344 0.0358
01:01-02:00, Fri., 14 Feb. 0.0389 0.0328 0.0356
00:01-01:00, Fri., 14 Feb. 0.0367 0.0330 0.0347
23:01-24:00, Thu., 13 Feb. 0.0363 0.0315 0.0344
22:01-23:00, Thu., 13 Feb. 0.0363 0.0322 0.0347
21:01-22:00, Thu., 13 Feb. 0.0367 0.0329 0.0350
20:01-21:00, Thu., 13 Feb. 0.0376 0.0324 0.0346
19:01-20:00, Thu., 13 Feb. 0.0381 0.0329 0.0349
18:01-19:00, Thu., 13 Feb. 0.0370 0.0322 0.0349
17:01-18:00, Thu., 13 Feb. 0.0374 0.0328 0.0349
16:01-17:00, Thu., 13 Feb. 0.0368 0.0321 0.0349
15:01-16:00, Thu., 13 Feb. 0.0368 0.0328 0.0352
14:01-15:00, Thu., 13 Feb. 0.0378 0.0321 0.0353
13:01-14:00, Thu., 13 Feb. 0.0378 0.0332 0.0355