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, Fri., 13 Feb. 0.0367 0.0319 0.0342
18:01-19:00, Fri., 13 Feb. 0.0364 0.0310 0.0340
17:01-18:00, Fri., 13 Feb. 0.0363 0.0321 0.0340
16:01-17:00, Fri., 13 Feb. 0.0365 0.0318 0.0341
15:01-16:00, Fri., 13 Feb. 0.0365 0.0320 0.0341
14:01-15:00, Fri., 13 Feb. 0.0380 0.0314 0.0344
13:01-14:00, Fri., 13 Feb. 0.0377 0.0329 0.0349
12:01-13:00, Fri., 13 Feb. 0.0366 0.0312 0.0346
11:01-12:00, Fri., 13 Feb. 0.0374 0.0328 0.0352
10:01-11:00, Fri., 13 Feb. 0.0394 0.0347 0.0370
09:01-10:00, Fri., 13 Feb. 0.0402 0.0353 0.0375
08:01-09:00, Fri., 13 Feb. 0.0388 0.0341 0.0360
07:01-08:00, Fri., 13 Feb. 0.0382 0.0330 0.0356
06:01-07:00, Fri., 13 Feb. 0.0379 0.0321 0.0355
05:01-06:00, Fri., 13 Feb. 0.0387 0.0328 0.0356
04:01-05:00, Fri., 13 Feb. 0.0379 0.0331 0.0359
03:01-04:00, Fri., 13 Feb. 0.0378 0.0332 0.0357
02:01-03:00, Fri., 13 Feb. 0.0385 0.0329 0.0357
01:01-02:00, Fri., 13 Feb. 0.0381 0.0338 0.0356
00:01-01:00, Fri., 13 Feb. 0.0378 0.0332 0.0352
23:01-24:00, Thu., 12 Feb. 0.0378 0.0324 0.0351
22:01-23:00, Thu., 12 Feb. 0.0374 0.0325 0.0351
21:01-22:00, Thu., 12 Feb. 0.0377 0.0327 0.0350
20:01-21:00, Thu., 12 Feb. 0.0384 0.0336 0.0354
19:01-20:00, Thu., 12 Feb. 0.0376 0.0328 0.0350
18:01-19:00, Thu., 12 Feb. 0.0361 0.0318 0.0342
17:01-18:00, Thu., 12 Feb. 0.0365 0.0313 0.0339
16:01-17:00, Thu., 12 Feb. 0.0365 0.0314 0.0342
15:01-16:00, Thu., 12 Feb. 0.0362 0.0321 0.0342
14:01-15:00, Thu., 12 Feb. 0.0363 0.0322 0.0342
13:01-14:00, Thu., 12 Feb. 0.0368 0.0316 0.0345
12:01-13:00, Thu., 12 Feb. 0.0373 0.0323 0.0346
11:01-12:00, Thu., 12 Feb. 0.0363 0.0319 0.0344
10:01-11:00, Thu., 12 Feb. 0.0371 0.0332 0.0350
09:01-10:00, Thu., 12 Feb. 0.0366 0.0325 0.0349
08:01-09:00, Thu., 12 Feb. 0.0375 0.0328 0.0352
07:01-08:00, Thu., 12 Feb. 0.0383 0.0334 0.0357
06:01-07:00, Thu., 12 Feb. 0.0385 0.0341 0.0361
05:01-06:00, Thu., 12 Feb. 0.0378 0.0332 0.0360
04:01-05:00, Thu., 12 Feb. 0.0388 0.0343 0.0362
03:01-04:00, Thu., 12 Feb. 0.0384 0.0342 0.0358
02:01-03:00, Thu., 12 Feb. 0.0377 0.0335 0.0359
01:01-02:00, Thu., 12 Feb. 0.0388 0.0335 0.0358
00:01-01:00, Thu., 12 Feb. 0.0381 0.0332 0.0355
23:01-24:00, Wed., 11 Feb. 0.0379 0.0335 0.0355
22:01-23:00, Wed., 11 Feb. 0.0377 0.0321 0.0350
21:01-22:00, Wed., 11 Feb. 0.0365 0.0322 0.0345
20:01-21:00, Wed., 11 Feb. 0.0370 0.0326 0.0349
19:01-20:00, Wed., 11 Feb. 0.0372 0.0330 0.0344
18:01-19:00, Wed., 11 Feb. 0.0387 0.0322 0.0352
17:01-18:00, Wed., 11 Feb. 0.0381 0.0341 0.0363
16:01-17:00, Wed., 11 Feb. 0.0386 0.0336 0.0357
15:01-16:00, Wed., 11 Feb. 0.0381 0.0325 0.0353
14:01-15:00, Wed., 11 Feb. 0.0384 0.0337 0.0360
13:01-14:00, Wed., 11 Feb. 0.0391 0.0337 0.0366
12:01-13:00, Wed., 11 Feb. 0.0455 0.0367 0.0400
11:01-12:00, Wed., 11 Feb. 0.0507 0.0423 0.0457
10:01-11:00, Wed., 11 Feb. 0.0485 0.0403 0.0445
09:01-10:00, Wed., 11 Feb. 0.0443 0.0392 0.0419
08:01-09:00, Wed., 11 Feb. 0.0446 0.0390 0.0416
07:01-08:00, Wed., 11 Feb. 0.0458 0.0391 0.0428
06:01-07:00, Wed., 11 Feb. 0.0445 0.0356 0.0389
05:01-06:00, Wed., 11 Feb. 0.0405 0.0339 0.0368
04:01-05:00, Wed., 11 Feb. 0.0388 0.0339 0.0362
03:01-04:00, Wed., 11 Feb. 0.0381 0.0336 0.0356
02:01-03:00, Wed., 11 Feb. 0.0380 0.0331 0.0355
01:01-02:00, Wed., 11 Feb. 0.0376 0.0332 0.0352
00:01-01:00, Wed., 11 Feb. 0.0395 0.0325 0.0354
23:01-24:00, Tue., 10 Feb. 0.0375 0.0329 0.0353
22:01-23:00, Tue., 10 Feb. 0.0370 0.0318 0.0351
21:01-22:00, Tue., 10 Feb. 0.0367 0.0315 0.0350
20:01-21:00, Tue., 10 Feb. 0.0371 0.0329 0.0349
19:01-20:00, Tue., 10 Feb. 0.0367 0.0327 0.0345
18:01-19:00, Tue., 10 Feb. 0.0361 0.0315 0.0338
17:01-18:00, Tue., 10 Feb. 0.0363 0.0316 0.0341
16:01-17:00, Tue., 10 Feb. 0.0367 0.0318 0.0339
15:01-16:00, Tue., 10 Feb. 0.0359 0.0304 0.0336
14:01-15:00, Tue., 10 Feb. 0.0365 0.0311 0.0338
13:01-14:00, Tue., 10 Feb. 0.0360 0.0316 0.0335
12:01-13:00, Tue., 10 Feb. 0.0370 0.0319 0.0341
11:01-12:00, Tue., 10 Feb. 0.0371 0.0328 0.0347
10:01-11:00, Tue., 10 Feb. 0.0371 0.0323 0.0350
09:01-10:00, Tue., 10 Feb. 0.0375 0.0331 0.0350
08:01-09:00, Tue., 10 Feb. 0.0388 0.0326 0.0356
07:01-08:00, Tue., 10 Feb. 0.0396 0.0335 0.0360
06:01-07:00, Tue., 10 Feb. 0.0374 0.0331 0.0352
05:01-06:00, Tue., 10 Feb. 0.0367 0.0315 0.0349
04:01-05:00, Tue., 10 Feb. 0.0377 0.0328 0.0350
03:01-04:00, Tue., 10 Feb. 0.0374 0.0331 0.0350
02:01-03:00, Tue., 10 Feb. 0.0367 0.0306 0.0344
01:01-02:00, Tue., 10 Feb. 0.0372 0.0323 0.0349
00:01-01:00, Tue., 10 Feb. 0.0367 0.0310 0.0348
23:01-24:00, Mon., 09 Feb. 0.0375 0.0329 0.0346
22:01-23:00, Mon., 09 Feb. 0.0385 0.0308 0.0347
21:01-22:00, Mon., 09 Feb. 0.0379 0.0319 0.0345
20:01-21:00, Mon., 09 Feb. 0.0359 0.0312 0.0341
19:01-20:00, Mon., 09 Feb. 0.0361 0.0318 0.0337
18:01-19:00, Mon., 09 Feb. 0.0356 0.0313 0.0336
17:01-18:00, Mon., 09 Feb. 0.0357 0.0312 0.0335
16:01-17:00, Mon., 09 Feb. 0.0360 0.0308 0.0334
15:01-16:00, Mon., 09 Feb. 0.0359 0.0316 0.0333
14:01-15:00, Mon., 09 Feb. 0.0352 0.0297 0.0334
13:01-14:00, Mon., 09 Feb. 0.0354 0.0311 0.0333
12:01-13:00, Mon., 09 Feb. 0.0354 0.0304 0.0332
11:01-12:00, Mon., 09 Feb. 0.0353 0.0310 0.0334
10:01-11:00, Mon., 09 Feb. 0.0360 0.0315 0.0336
09:01-10:00, Mon., 09 Feb. 0.0362 0.0319 0.0337
08:01-09:00, Mon., 09 Feb. 0.0360 0.0312 0.0337
07:01-08:00, Mon., 09 Feb. 0.0363 0.0315 0.0336
06:01-07:00, Mon., 09 Feb. 0.0370 0.0318 0.0341
05:01-06:00, Mon., 09 Feb. 0.0366 0.0320 0.0341
04:01-05:00, Mon., 09 Feb. 0.0366 0.0316 0.0339
03:01-04:00, Mon., 09 Feb. 0.0356 0.0315 0.0338
02:01-03:00, Mon., 09 Feb. 0.0363 0.0314 0.0339
01:01-02:00, Mon., 09 Feb. 0.0363 0.0320 0.0339
00:01-01:00, Mon., 09 Feb. 0.0364 0.0310 0.0341
23:01-24:00, Sun., 08 Feb. 0.0375 0.0322 0.0343
22:01-23:00, Sun., 08 Feb. 0.0367 0.0326 0.0345
21:01-22:00, Sun., 08 Feb. 0.0375 0.0325 0.0346
20:01-21:00, Sun., 08 Feb. 0.0365 0.0322 0.0344
19:01-20:00, Sun., 08 Feb. 0.0365 0.0324 0.0344
18:01-19:00, Sun., 08 Feb. 0.0371 0.0318 0.0341
17:01-18:00, Sun., 08 Feb. 0.0363 0.0319 0.0342
16:01-17:00, Sun., 08 Feb. 0.0360 0.0318 0.0340
15:01-16:00, Sun., 08 Feb. 0.0367 0.0321 0.0345
14:01-15:00, Sun., 08 Feb. 0.0367 0.0315 0.0346
13:01-14:00, Sun., 08 Feb. 0.0391 0.0330 0.0361
12:01-13:00, Sun., 08 Feb. 0.0441 0.0357 0.0389
11:01-12:00, Sun., 08 Feb. 0.0425 0.0367 0.0394
10:01-11:00, Sun., 08 Feb. 0.0457 0.0387 0.0416
09:01-10:00, Sun., 08 Feb. 0.0461 0.0404 0.0427
08:01-09:00, Sun., 08 Feb. 0.0452 0.0377 0.0420
07:01-08:00, Sun., 08 Feb. 0.0398 0.0333 0.0360
06:01-07:00, Sun., 08 Feb. 0.0391 0.0341 0.0362
05:01-06:00, Sun., 08 Feb. 0.0408 0.0349 0.0383
04:01-05:00, Sun., 08 Feb. 0.0423 0.0367 0.0396
03:01-04:00, Sun., 08 Feb. 0.0435 0.0388 0.0413
02:01-03:00, Sun., 08 Feb. 0.0448 0.0385 0.0419
01:01-02:00, Sun., 08 Feb. 0.0422 0.0354 0.0388
00:01-01:00, Sun., 08 Feb. 0.0413 0.0349 0.0370
23:01-24:00, Sat., 07 Feb. 0.0447 0.0367 0.0398
22:01-23:00, Sat., 07 Feb. 0.0476 0.0401 0.0446
21:01-22:00, Sat., 07 Feb. 0.0424 0.0346 0.0379
20:01-21:00, Sat., 07 Feb. 0.0387 0.0336 0.0364
19:01-20:00, Sat., 07 Feb. 0.0391 0.0337 0.0360
18:01-19:00, Sat., 07 Feb. 0.0380 0.0326 0.0355
17:01-18:00, Sat., 07 Feb. 0.0374 0.0326 0.0354
16:01-17:00, Sat., 07 Feb. 0.0381 0.0326 0.0360
15:01-16:00, Sat., 07 Feb. 0.0405 0.0355 0.0379
14:01-15:00, Sat., 07 Feb. 0.0481 0.0388 0.0431
13:01-14:00, Sat., 07 Feb. 0.0478 0.0416 0.0443
12:01-13:00, Sat., 07 Feb. 0.0466 0.0397 0.0428
11:01-12:00, Sat., 07 Feb. 0.0465 0.0394 0.0431
10:01-11:00, Sat., 07 Feb. 0.0426 0.0367 0.0394
09:01-10:00, Sat., 07 Feb. 0.0401 0.0340 0.0370
08:01-09:00, Sat., 07 Feb. 0.0391 0.0339 0.0362
07:01-08:00, Sat., 07 Feb. 0.0390 0.0343 0.0363
06:01-07:00, Sat., 07 Feb. 0.0388 0.0342 0.0362
05:01-06:00, Sat., 07 Feb. 0.0391 0.0338 0.0362
04:01-05:00, Sat., 07 Feb. 0.0384 0.0336 0.0361
03:01-04:00, Sat., 07 Feb. 0.0382 0.0341 0.0358
02:01-03:00, Sat., 07 Feb. 0.0386 0.0338 0.0358
01:01-02:00, Sat., 07 Feb. 0.0391 0.0332 0.0359
00:01-01:00, Sat., 07 Feb. 0.0391 0.0341 0.0362
23:01-24:00, Fri., 06 Feb. 0.0381 0.0338 0.0360
22:01-23:00, Fri., 06 Feb. 0.0383 0.0339 0.0360
21:01-22:00, Fri., 06 Feb. 0.0393 0.0342 0.0358
20:01-21:00, Fri., 06 Feb. 0.0384 0.0336 0.0357
19:01-20:00, Fri., 06 Feb. 0.0377 0.0326 0.0354
18:01-19:00, Fri., 06 Feb. 0.0387 0.0329 0.0351
17:01-18:00, Fri., 06 Feb. 0.0374 0.0317 0.0345
16:01-17:00, Fri., 06 Feb. 0.0371 0.0323 0.0348
15:01-16:00, Fri., 06 Feb. 0.0369 0.0323 0.0348
14:01-15:00, Fri., 06 Feb. 0.0377 0.0316 0.0346
13:01-14:00, Fri., 06 Feb. 0.0377 0.0327 0.0350
12:01-13:00, Fri., 06 Feb. 0.0374 0.0331 0.0352
11:01-12:00, Fri., 06 Feb. 0.0382 0.0335 0.0359
10:01-11:00, Fri., 06 Feb. 0.0381 0.0331 0.0352
09:01-10:00, Fri., 06 Feb. 0.0387 0.0335 0.0360
08:01-09:00, Fri., 06 Feb. 0.0386 0.0332 0.0362
07:01-08:00, Fri., 06 Feb. 0.0392 0.0348 0.0366
06:01-07:00, Fri., 06 Feb. 0.0378 0.0322 0.0358
05:01-06:00, Fri., 06 Feb. 0.0385 0.0338 0.0363
04:01-05:00, Fri., 06 Feb. 0.0384 0.0336 0.0362
03:01-04:00, Fri., 06 Feb. 0.0381 0.0342 0.0360
02:01-03:00, Fri., 06 Feb. 0.0395 0.0343 0.0365
01:01-02:00, Fri., 06 Feb. 0.0383 0.0346 0.0364
00:01-01:00, Fri., 06 Feb. 0.0386 0.0342 0.0365
23:01-24:00, Thu., 05 Feb. 0.0384 0.0346 0.0366
22:01-23:00, Thu., 05 Feb. 0.0394 0.0332 0.0358
21:01-22:00, Thu., 05 Feb. 0.0373 0.0327 0.0352
20:01-21:00, Thu., 05 Feb. 0.0376 0.0325 0.0351
19:01-20:00, Thu., 05 Feb. 0.0382 0.0319 0.0353
18:01-19:00, Thu., 05 Feb. 0.0383 0.0328 0.0351
17:01-18:00, Thu., 05 Feb. 0.0370 0.0327 0.0351
16:01-17:00, Thu., 05 Feb. 0.0377 0.0335 0.0353
15:01-16:00, Thu., 05 Feb. 0.0376 0.0334 0.0351
14:01-15:00, Thu., 05 Feb. 0.0370 0.0325 0.0352
13:01-14:00, Thu., 05 Feb. 0.0370 0.0329 0.0351
12:01-13:00, Thu., 05 Feb. 0.0377 0.0325 0.0349
11:01-12:00, Thu., 05 Feb. 0.0379 0.0330 0.0357
10:01-11:00, Thu., 05 Feb. 0.0398 0.0339 0.0368
09:01-10:00, Thu., 05 Feb. 0.0395 0.0357 0.0374
08:01-09:00, Thu., 05 Feb. 0.0400 0.0343 0.0370
07:01-08:00, Thu., 05 Feb. 0.0388 0.0348 0.0367
06:01-07:00, Thu., 05 Feb. 0.0402 0.0335 0.0366
05:01-06:00, Thu., 05 Feb. 0.0391 0.0349 0.0366
04:01-05:00, Thu., 05 Feb. 0.0388 0.0336 0.0365
03:01-04:00, Thu., 05 Feb. 0.0391 0.0339 0.0367
02:01-03:00, Thu., 05 Feb. 0.0388 0.0345 0.0367
01:01-02:00, Thu., 05 Feb. 0.0387 0.0345 0.0367
00:01-01:00, Thu., 05 Feb. 0.0391 0.0339 0.0366
23:01-24:00, Wed., 04 Feb. 0.0388 0.0340 0.0364
22:01-23:00, Wed., 04 Feb. 0.0388 0.0336 0.0362
21:01-22:00, Wed., 04 Feb. 0.0384 0.0325 0.0359
20:01-21:00, Wed., 04 Feb. 0.0379 0.0336 0.0356
19:01-20:00, Wed., 04 Feb. 0.0377 0.0329 0.0352
18:01-19:00, Wed., 04 Feb. 0.0371 0.0332 0.0349
17:01-18:00, Wed., 04 Feb. 0.0381 0.0330 0.0351
16:01-17:00, Wed., 04 Feb. 0.0381 0.0332 0.0351
15:01-16:00, Wed., 04 Feb. 0.0369 0.0324 0.0350
14:01-15:00, Wed., 04 Feb. 0.0368 0.0333 0.0351
13:01-14:00, Wed., 04 Feb. 0.0380 0.0325 0.0352
12:01-13:00, Wed., 04 Feb. 0.0383 0.0331 0.0353
11:01-12:00, Wed., 04 Feb. 0.0377 0.0330 0.0355
10:01-11:00, Wed., 04 Feb. 0.0392 0.0344 0.0364
09:01-10:00, Wed., 04 Feb. 0.0388 0.0334 0.0365
08:01-09:00, Wed., 04 Feb. 0.0384 0.0336 0.0365
07:01-08:00, Wed., 04 Feb. 0.0391 0.0339 0.0363
06:01-07:00, Wed., 04 Feb. 0.0388 0.0349 0.0369
05:01-06:00, Wed., 04 Feb. 0.0398 0.0353 0.0373
04:01-05:00, Wed., 04 Feb. 0.0391 0.0351 0.0374
03:01-04:00, Wed., 04 Feb. 0.0393 0.0349 0.0370
02:01-03:00, Wed., 04 Feb. 0.0391 0.0337 0.0364
01:01-02:00, Wed., 04 Feb. 0.0383 0.0331 0.0355
00:01-01:00, Wed., 04 Feb. 0.0379 0.0335 0.0355
23:01-24:00, Tue., 03 Feb. 0.0375 0.0318 0.0354
22:01-23:00, Tue., 03 Feb. 0.0384 0.0327 0.0354
21:01-22:00, Tue., 03 Feb. 0.0376 0.0332 0.0353
20:01-21:00, Tue., 03 Feb. 0.0375 0.0317 0.0350