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
16:01-17:00, Fri., 06 Mar. 0.0350 0.0313 0.0333
15:01-16:00, Fri., 06 Mar. 0.0360 0.0322 0.0335
14:01-15:00, Fri., 06 Mar. 0.0353 0.0307 0.0334
13:01-14:00, Fri., 06 Mar. 0.0367 0.0316 0.0335
12:01-13:00, Fri., 06 Mar. 0.0370 0.0310 0.0336
11:01-12:00, Fri., 06 Mar. 0.0356 0.0318 0.0337
10:01-11:00, Fri., 06 Mar. 0.0365 0.0315 0.0336
09:01-10:00, Fri., 06 Mar. 0.0368 0.0322 0.0345
08:01-09:00, Fri., 06 Mar. 0.0378 0.0325 0.0352
07:01-08:00, Fri., 06 Mar. 0.0369 0.0322 0.0348
06:01-07:00, Fri., 06 Mar. 0.0376 0.0315 0.0347
05:01-06:00, Fri., 06 Mar. 0.0360 0.0322 0.0343
04:01-05:00, Fri., 06 Mar. 0.0363 0.0317 0.0338
03:01-04:00, Fri., 06 Mar. 0.0364 0.0311 0.0337
02:01-03:00, Fri., 06 Mar. 0.0366 0.0315 0.0338
01:01-02:00, Fri., 06 Mar. 0.0364 0.0313 0.0336
00:01-01:00, Fri., 06 Mar. 0.0353 0.0315 0.0332
23:01-24:00, Thu., 05 Mar. 0.0360 0.0309 0.0329
22:01-23:00, Thu., 05 Mar. 0.0356 0.0308 0.0331
21:01-22:00, Thu., 05 Mar. 0.0364 0.0297 0.0329
20:01-21:00, Thu., 05 Mar. 0.0353 0.0304 0.0331
19:01-20:00, Thu., 05 Mar. 0.0352 0.0304 0.0330
18:01-19:00, Thu., 05 Mar. 0.0349 0.0300 0.0328
17:01-18:00, Thu., 05 Mar. 0.0354 0.0303 0.0329
16:01-17:00, Thu., 05 Mar. 0.0346 0.0302 0.0324
15:01-16:00, Thu., 05 Mar. 0.0349 0.0307 0.0329
14:01-15:00, Thu., 05 Mar. 0.0345 0.0299 0.0324
13:01-14:00, Thu., 05 Mar. 0.0348 0.0310 0.0331
12:01-13:00, Thu., 05 Mar. 0.0358 0.0309 0.0332
11:01-12:00, Thu., 05 Mar. 0.0356 0.0308 0.0328
10:01-11:00, Thu., 05 Mar. 0.0353 0.0308 0.0331
09:01-10:00, Thu., 05 Mar. 0.0354 0.0311 0.0331
08:01-09:00, Thu., 05 Mar. 0.0349 0.0306 0.0330
07:01-08:00, Thu., 05 Mar. 0.0359 0.0302 0.0336
06:01-07:00, Thu., 05 Mar. 0.0357 0.0307 0.0338
05:01-06:00, Thu., 05 Mar. 0.0368 0.0313 0.0343
04:01-05:00, Thu., 05 Mar. 0.0366 0.0317 0.0339
03:01-04:00, Thu., 05 Mar. 0.0360 0.0310 0.0338
02:01-03:00, Thu., 05 Mar. 0.0357 0.0314 0.0337
01:01-02:00, Thu., 05 Mar. 0.0362 0.0312 0.0332
00:01-01:00, Thu., 05 Mar. 0.0357 0.0308 0.0331
23:01-24:00, Wed., 04 Mar. 0.0351 0.0308 0.0332
22:01-23:00, Wed., 04 Mar. 0.0365 0.0311 0.0334
21:01-22:00, Wed., 04 Mar. 0.0360 0.0313 0.0335
20:01-21:00, Wed., 04 Mar. 0.0361 0.0314 0.0333
19:01-20:00, Wed., 04 Mar. 0.0355 0.0303 0.0331
18:01-19:00, Wed., 04 Mar. 0.0351 0.0307 0.0328
17:01-18:00, Wed., 04 Mar. 0.0350 0.0308 0.0331
16:01-17:00, Wed., 04 Mar. 0.0367 0.0304 0.0331
15:01-16:00, Wed., 04 Mar. 0.0351 0.0306 0.0331
14:01-15:00, Wed., 04 Mar. 0.0348 0.0305 0.0330
13:01-14:00, Wed., 04 Mar. 0.0350 0.0311 0.0331
12:01-13:00, Wed., 04 Mar. 0.0354 0.0311 0.0335
11:01-12:00, Wed., 04 Mar. 0.0353 0.0314 0.0334
10:01-11:00, Wed., 04 Mar. 0.0360 0.0318 0.0336
09:01-10:00, Wed., 04 Mar. 0.0362 0.0317 0.0341
08:01-09:00, Wed., 04 Mar. 0.0368 0.0311 0.0342
07:01-08:00, Wed., 04 Mar. 0.0363 0.0308 0.0339
06:01-07:00, Wed., 04 Mar. 0.0379 0.0322 0.0354
05:01-06:00, Wed., 04 Mar. 0.0410 0.0345 0.0377
04:01-05:00, Wed., 04 Mar. 0.0429 0.0377 0.0402
03:01-04:00, Wed., 04 Mar. 0.0468 0.0406 0.0437
02:01-03:00, Wed., 04 Mar. 0.0478 0.0424 0.0456
01:01-02:00, Wed., 04 Mar. 0.0520 0.0440 0.0476
00:01-01:00, Wed., 04 Mar. 0.0516 0.0457 0.0489
23:01-24:00, Tue., 03 Mar. 0.0511 0.0429 0.0468
22:01-23:00, Tue., 03 Mar. 0.0468 0.0398 0.0425
21:01-22:00, Tue., 03 Mar. 0.0510 0.0440 0.0470
20:01-21:00, Tue., 03 Mar. 0.0484 0.0409 0.0436
19:01-20:00, Tue., 03 Mar. 0.0484 0.0428 0.0461
18:01-19:00, Tue., 03 Mar. 0.0495 0.0424 0.0461
17:01-18:00, Tue., 03 Mar. 0.0485 0.0405 0.0443
16:01-17:00, Tue., 03 Mar. 0.0466 0.0398 0.0438
15:01-16:00, Tue., 03 Mar. 0.0448 0.0380 0.0407
14:01-15:00, Tue., 03 Mar. 0.0445 0.0388 0.0413
13:01-14:00, Tue., 03 Mar. 0.0460 0.0402 0.0433
12:01-13:00, Tue., 03 Mar. 0.0461 0.0410 0.0435
11:01-12:00, Tue., 03 Mar. 0.0466 0.0398 0.0433
10:01-11:00, Tue., 03 Mar. 0.0449 0.0391 0.0418
09:01-10:00, Tue., 03 Mar. 0.0431 0.0386 0.0409
08:01-09:00, Tue., 03 Mar. 0.0427 0.0377 0.0408
07:01-08:00, Tue., 03 Mar. 0.0439 0.0374 0.0403
06:01-07:00, Tue., 03 Mar. 0.0414 0.0360 0.0385
05:01-06:00, Tue., 03 Mar. 0.0390 0.0329 0.0360
04:01-05:00, Tue., 03 Mar. 0.0375 0.0323 0.0346
03:01-04:00, Tue., 03 Mar. 0.0356 0.0308 0.0335
02:01-03:00, Tue., 03 Mar. 0.0350 0.0317 0.0335
01:01-02:00, Tue., 03 Mar. 0.0359 0.0311 0.0336
00:01-01:00, Tue., 03 Mar. 0.0358 0.0304 0.0335
23:01-24:00, Mon., 02 Mar. 0.0356 0.0303 0.0335
22:01-23:00, Mon., 02 Mar. 0.0355 0.0314 0.0335
21:01-22:00, Mon., 02 Mar. 0.0363 0.0310 0.0335
20:01-21:00, Mon., 02 Mar. 0.0365 0.0309 0.0337
19:01-20:00, Mon., 02 Mar. 0.0360 0.0299 0.0333
18:01-19:00, Mon., 02 Mar. 0.0357 0.0314 0.0334
17:01-18:00, Mon., 02 Mar. 0.0371 0.0311 0.0335
16:01-17:00, Mon., 02 Mar. 0.0361 0.0315 0.0340
15:01-16:00, Mon., 02 Mar. 0.0356 0.0309 0.0338
14:01-15:00, Mon., 02 Mar. 0.0364 0.0312 0.0340
13:01-14:00, Mon., 02 Mar. 0.0364 0.0319 0.0342
12:01-13:00, Mon., 02 Mar. 0.0363 0.0318 0.0344
11:01-12:00, Mon., 02 Mar. 0.0364 0.0308 0.0340
10:01-11:00, Mon., 02 Mar. 0.0376 0.0325 0.0344
09:01-10:00, Mon., 02 Mar. 0.0376 0.0311 0.0344
08:01-09:00, Mon., 02 Mar. 0.0382 0.0322 0.0351
07:01-08:00, Mon., 02 Mar. 0.0372 0.0329 0.0351
06:01-07:00, Mon., 02 Mar. 0.0379 0.0326 0.0348
05:01-06:00, Mon., 02 Mar. 0.0374 0.0320 0.0345
04:01-05:00, Mon., 02 Mar. 0.0372 0.0325 0.0346
03:01-04:00, Mon., 02 Mar. 0.0370 0.0321 0.0346
02:01-03:00, Mon., 02 Mar. 0.0367 0.0318 0.0344
01:01-02:00, Mon., 02 Mar. 0.0366 0.0325 0.0345
00:01-01:00, Mon., 02 Mar. 0.0378 0.0317 0.0343
23:01-24:00, Sun., 01 Mar. 0.0358 0.0314 0.0340
22:01-23:00, Sun., 01 Mar. 0.0376 0.0313 0.0335
21:01-22:00, Sun., 01 Mar. 0.0363 0.0302 0.0329
20:01-21:00, Sun., 01 Mar. 0.0355 0.0303 0.0332
19:01-20:00, Sun., 01 Mar. 0.0353 0.0302 0.0331
18:01-19:00, Sun., 01 Mar. 0.0353 0.0298 0.0330
17:01-18:00, Sun., 01 Mar. 0.0360 0.0317 0.0332
16:01-17:00, Sun., 01 Mar. 0.0352 0.0307 0.0335
15:01-16:00, Sun., 01 Mar. 0.0360 0.0316 0.0337
14:01-15:00, Sun., 01 Mar. 0.0359 0.0306 0.0337
13:01-14:00, Sun., 01 Mar. 0.0359 0.0319 0.0337
12:01-13:00, Sun., 01 Mar. 0.0360 0.0305 0.0333
11:01-12:00, Sun., 01 Mar. 0.0360 0.0315 0.0338
10:01-11:00, Sun., 01 Mar. 0.0370 0.0318 0.0344
09:01-10:00, Sun., 01 Mar. 0.0371 0.0325 0.0346
08:01-09:00, Sun., 01 Mar. 0.0363 0.0315 0.0345
07:01-08:00, Sun., 01 Mar. 0.0369 0.0327 0.0346
06:01-07:00, Sun., 01 Mar. 0.0360 0.0322 0.0342
05:01-06:00, Sun., 01 Mar. 0.0371 0.0310 0.0343
04:01-05:00, Sun., 01 Mar. 0.0373 0.0306 0.0340
03:01-04:00, Sun., 01 Mar. 0.0361 0.0320 0.0339
02:01-03:00, Sun., 01 Mar. 0.0374 0.0318 0.0340
01:01-02:00, Sun., 01 Mar. 0.0363 0.0315 0.0340
00:01-01:00, Sun., 01 Mar. 0.0362 0.0315 0.0336
23:01-24:00, Sat., 28 Feb. 0.0362 0.0311 0.0336
22:01-23:00, Sat., 28 Feb. 0.0356 0.0315 0.0335
21:01-22:00, Sat., 28 Feb. 0.0359 0.0315 0.0334
20:01-21:00, Sat., 28 Feb. 0.0356 0.0310 0.0332
19:01-20:00, Sat., 28 Feb. 0.0361 0.0308 0.0330
18:01-19:00, Sat., 28 Feb. 0.0356 0.0305 0.0332
17:01-18:00, Sat., 28 Feb. 0.0360 0.0310 0.0333
16:01-17:00, Sat., 28 Feb. 0.0359 0.0312 0.0336
15:01-16:00, Sat., 28 Feb. 0.0361 0.0304 0.0335
14:01-15:00, Sat., 28 Feb. 0.0363 0.0315 0.0339
13:01-14:00, Sat., 28 Feb. 0.0364 0.0313 0.0340
12:01-13:00, Sat., 28 Feb. 0.0370 0.0307 0.0339
11:01-12:00, Sat., 28 Feb. 0.0359 0.0321 0.0340
10:01-11:00, Sat., 28 Feb. 0.0367 0.0315 0.0339
09:01-10:00, Sat., 28 Feb. 0.0366 0.0315 0.0343
08:01-09:00, Sat., 28 Feb. 0.0375 0.0318 0.0346
07:01-08:00, Sat., 28 Feb. 0.0368 0.0321 0.0346
06:01-07:00, Sat., 28 Feb. 0.0363 0.0318 0.0344
05:01-06:00, Sat., 28 Feb. 0.0380 0.0327 0.0346
04:01-05:00, Sat., 28 Feb. 0.0374 0.0320 0.0342
03:01-04:00, Sat., 28 Feb. 0.0365 0.0316 0.0340
02:01-03:00, Sat., 28 Feb. 0.0360 0.0315 0.0336
01:01-02:00, Sat., 28 Feb. 0.0356 0.0311 0.0335
00:01-01:00, Sat., 28 Feb. 0.0351 0.0310 0.0331
23:01-24:00, Fri., 27 Feb. 0.0351 0.0309 0.0332
22:01-23:00, Fri., 27 Feb. 0.0349 0.0306 0.0332
21:01-22:00, Fri., 27 Feb. 0.0355 0.0303 0.0332
20:01-21:00, Fri., 27 Feb. 0.0353 0.0300 0.0329
19:01-20:00, Fri., 27 Feb. 0.0356 0.0311 0.0331
18:01-19:00, Fri., 27 Feb. 0.0353 0.0310 0.0327
17:01-18:00, Fri., 27 Feb. 0.0354 0.0312 0.0329
16:01-17:00, Fri., 27 Feb. 0.0360 0.0308 0.0334
15:01-16:00, Fri., 27 Feb. 0.0354 0.0311 0.0331
14:01-15:00, Fri., 27 Feb. 0.0356 0.0314 0.0334
13:01-14:00, Fri., 27 Feb. 0.0353 0.0308 0.0330
12:01-13:00, Fri., 27 Feb. 0.0360 0.0312 0.0330
11:01-12:00, Fri., 27 Feb. 0.0353 0.0302 0.0332
10:01-11:00, Fri., 27 Feb. 0.0366 0.0318 0.0336
09:01-10:00, Fri., 27 Feb. 0.0360 0.0304 0.0337
08:01-09:00, Fri., 27 Feb. 0.0360 0.0307 0.0333
07:01-08:00, Fri., 27 Feb. 0.0360 0.0315 0.0335
06:01-07:00, Fri., 27 Feb. 0.0366 0.0308 0.0336
05:01-06:00, Fri., 27 Feb. 0.0355 0.0315 0.0334
04:01-05:00, Fri., 27 Feb. 0.0357 0.0311 0.0332
03:01-04:00, Fri., 27 Feb. 0.0352 0.0318 0.0333
02:01-03:00, Fri., 27 Feb. 0.0363 0.0305 0.0331
01:01-02:00, Fri., 27 Feb. 0.0359 0.0304 0.0334
00:01-01:00, Fri., 27 Feb. 0.0348 0.0304 0.0330
23:01-24:00, Thu., 26 Feb. 0.0353 0.0310 0.0331
22:01-23:00, Thu., 26 Feb. 0.0353 0.0314 0.0334
21:01-22:00, Thu., 26 Feb. 0.0356 0.0301 0.0332
20:01-21:00, Thu., 26 Feb. 0.0350 0.0311 0.0331
19:01-20:00, Thu., 26 Feb. 0.0352 0.0310 0.0331
18:01-19:00, Thu., 26 Feb. 0.0360 0.0306 0.0330
17:01-18:00, Thu., 26 Feb. 0.0360 0.0302 0.0329
16:01-17:00, Thu., 26 Feb. 0.0357 0.0313 0.0330
15:01-16:00, Thu., 26 Feb. 0.0350 0.0314 0.0331
14:01-15:00, Thu., 26 Feb. 0.0349 0.0300 0.0332
13:01-14:00, Thu., 26 Feb. 0.0353 0.0311 0.0329
12:01-13:00, Thu., 26 Feb. 0.0363 0.0309 0.0334
11:01-12:00, Thu., 26 Feb. 0.0354 0.0316 0.0334
10:01-11:00, Thu., 26 Feb. 0.0368 0.0305 0.0338
09:01-10:00, Thu., 26 Feb. 0.0355 0.0310 0.0335
08:01-09:00, Thu., 26 Feb. 0.0360 0.0323 0.0341
07:01-08:00, Thu., 26 Feb. 0.0373 0.0327 0.0350
06:01-07:00, Thu., 26 Feb. 0.0395 0.0341 0.0364
05:01-06:00, Thu., 26 Feb. 0.0399 0.0337 0.0366
04:01-05:00, Thu., 26 Feb. 0.0396 0.0345 0.0377
03:01-04:00, Thu., 26 Feb. 0.0419 0.0368 0.0397
02:01-03:00, Thu., 26 Feb. 0.0430 0.0363 0.0400
01:01-02:00, Thu., 26 Feb. 0.0445 0.0399 0.0423
00:01-01:00, Thu., 26 Feb. 0.0433 0.0367 0.0398
23:01-24:00, Wed., 25 Feb. 0.0424 0.0374 0.0400
22:01-23:00, Wed., 25 Feb. 0.0432 0.0382 0.0406
21:01-22:00, Wed., 25 Feb. 0.0423 0.0383 0.0406
20:01-21:00, Wed., 25 Feb. 0.0424 0.0374 0.0401
19:01-20:00, Wed., 25 Feb. 0.0461 0.0396 0.0419
18:01-19:00, Wed., 25 Feb. 0.0455 0.0404 0.0425
17:01-18:00, Wed., 25 Feb. 0.0447 0.0393 0.0416
16:01-17:00, Wed., 25 Feb. 0.0471 0.0395 0.0421
15:01-16:00, Wed., 25 Feb. 0.0446 0.0395 0.0420
14:01-15:00, Wed., 25 Feb. 0.0436 0.0343 0.0385
13:01-14:00, Wed., 25 Feb. 0.0428 0.0345 0.0389
12:01-13:00, Wed., 25 Feb. 0.0457 0.0386 0.0421
11:01-12:00, Wed., 25 Feb. 0.0429 0.0360 0.0400
10:01-11:00, Wed., 25 Feb. 0.0409 0.0345 0.0373
09:01-10:00, Wed., 25 Feb. 0.0389 0.0342 0.0366
08:01-09:00, Wed., 25 Feb. 0.0376 0.0336 0.0358
07:01-08:00, Wed., 25 Feb. 0.0378 0.0332 0.0356
06:01-07:00, Wed., 25 Feb. 0.0372 0.0326 0.0346
05:01-06:00, Wed., 25 Feb. 0.0363 0.0322 0.0343
04:01-05:00, Wed., 25 Feb. 0.0360 0.0314 0.0344
03:01-04:00, Wed., 25 Feb. 0.0370 0.0304 0.0342
02:01-03:00, Wed., 25 Feb. 0.0368 0.0319 0.0343
01:01-02:00, Wed., 25 Feb. 0.0362 0.0314 0.0339
00:01-01:00, Wed., 25 Feb. 0.0373 0.0317 0.0343
23:01-24:00, Tue., 24 Feb. 0.0370 0.0316 0.0342
22:01-23:00, Tue., 24 Feb. 0.0357 0.0322 0.0339
21:01-22:00, Tue., 24 Feb. 0.0367 0.0312 0.0339
20:01-21:00, Tue., 24 Feb. 0.0355 0.0319 0.0337
19:01-20:00, Tue., 24 Feb. 0.0365 0.0311 0.0336
18:01-19:00, Tue., 24 Feb. 0.0367 0.0319 0.0340
17:01-18:00, Tue., 24 Feb. 0.0367 0.0321 0.0344