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
20:01-21:00, Sun., 29 Mar. 0.0349 0.0304 0.0327
19:01-20:00, Sun., 29 Mar. 0.0360 0.0304 0.0328
18:01-19:00, Sun., 29 Mar. 0.0365 0.0308 0.0335
17:01-18:00, Sun., 29 Mar. 0.0365 0.0308 0.0334
16:01-17:00, Sun., 29 Mar. 0.0357 0.0315 0.0336
15:01-16:00, Sun., 29 Mar. 0.0367 0.0316 0.0335
14:01-15:00, Sun., 29 Mar. 0.0356 0.0312 0.0335
13:01-14:00, Sun., 29 Mar. 0.0368 0.0313 0.0338
12:01-13:00, Sun., 29 Mar. 0.0354 0.0316 0.0337
11:01-12:00, Sun., 29 Mar. 0.0365 0.0318 0.0339
10:01-11:00, Sun., 29 Mar. 0.0366 0.0312 0.0338
09:01-10:00, Sun., 29 Mar. 0.0364 0.0309 0.0335
08:01-09:00, Sun., 29 Mar. 0.0362 0.0312 0.0337
07:01-08:00, Sun., 29 Mar. 0.0366 0.0315 0.0340
06:01-07:00, Sun., 29 Mar. 0.0363 0.0322 0.0342
05:01-06:00, Sun., 29 Mar. 0.0358 0.0301 0.0337
04:01-05:00, Sun., 29 Mar. 0.0359 0.0315 0.0336
03:01-04:00, Sun., 29 Mar. 0.0367 0.0316 0.0337
02:01-03:00, Sun., 29 Mar. 0.0368 0.0318 0.0338
01:01-02:00, Sun., 29 Mar. 0.0358 0.0304 0.0339
00:01-01:00, Sun., 29 Mar. 0.0364 0.0311 0.0338
23:01-24:00, Sat., 28 Mar. 0.0359 0.0312 0.0336
22:01-23:00, Sat., 28 Mar. 0.0353 0.0304 0.0333
21:01-22:00, Sat., 28 Mar. 0.0361 0.0309 0.0334
20:01-21:00, Sat., 28 Mar. 0.0348 0.0303 0.0329
19:01-20:00, Sat., 28 Mar. 0.0350 0.0304 0.0327
18:01-19:00, Sat., 28 Mar. 0.0355 0.0308 0.0326
17:01-18:00, Sat., 28 Mar. 0.0343 0.0307 0.0325
16:01-17:00, Sat., 28 Mar. 0.0352 0.0314 0.0332
15:01-16:00, Sat., 28 Mar. 0.0352 0.0301 0.0328
14:01-15:00, Sat., 28 Mar. 0.0349 0.0297 0.0328
13:01-14:00, Sat., 28 Mar. 0.0362 0.0309 0.0329
12:01-13:00, Sat., 28 Mar. 0.0348 0.0308 0.0329
11:01-12:00, Sat., 28 Mar. 0.0351 0.0301 0.0326
10:01-11:00, Sat., 28 Mar. 0.0349 0.0311 0.0327
09:01-10:00, Sat., 28 Mar. 0.0351 0.0310 0.0326
08:01-09:00, Sat., 28 Mar. 0.0352 0.0300 0.0327
07:01-08:00, Sat., 28 Mar. 0.0350 0.0309 0.0330
06:01-07:00, Sat., 28 Mar. 0.0352 0.0308 0.0327
05:01-06:00, Sat., 28 Mar. 0.0351 0.0310 0.0328
04:01-05:00, Sat., 28 Mar. 0.0354 0.0308 0.0329
03:01-04:00, Sat., 28 Mar. 0.0346 0.0311 0.0332
02:01-03:00, Sat., 28 Mar. 0.0381 0.0322 0.0352
01:01-02:00, Sat., 28 Mar. 0.0400 0.0332 0.0364
00:01-01:00, Sat., 28 Mar. 0.0376 0.0315 0.0345
23:01-24:00, Fri., 27 Mar. 0.0368 0.0317 0.0344
22:01-23:00, Fri., 27 Mar. 0.0379 0.0334 0.0354
21:01-22:00, Fri., 27 Mar. 0.0372 0.0306 0.0337
20:01-21:00, Fri., 27 Mar. 0.0351 0.0305 0.0328
19:01-20:00, Fri., 27 Mar. 0.0346 0.0300 0.0322
18:01-19:00, Fri., 27 Mar. 0.0342 0.0301 0.0325
17:01-18:00, Fri., 27 Mar. 0.0346 0.0308 0.0326
16:01-17:00, Fri., 27 Mar. 0.0353 0.0306 0.0330
15:01-16:00, Fri., 27 Mar. 0.0347 0.0308 0.0327
14:01-15:00, Fri., 27 Mar. 0.0353 0.0303 0.0331
13:01-14:00, Fri., 27 Mar. 0.0356 0.0301 0.0330
12:01-13:00, Fri., 27 Mar. 0.0353 0.0301 0.0328
11:01-12:00, Fri., 27 Mar. 0.0344 0.0305 0.0326
10:01-11:00, Fri., 27 Mar. 0.0356 0.0308 0.0329
09:01-10:00, Fri., 27 Mar. 0.0356 0.0304 0.0331
08:01-09:00, Fri., 27 Mar. 0.0363 0.0313 0.0334
07:01-08:00, Fri., 27 Mar. 0.0356 0.0307 0.0332
06:01-07:00, Fri., 27 Mar. 0.0350 0.0314 0.0334
05:01-06:00, Fri., 27 Mar. 0.0356 0.0311 0.0331
04:01-05:00, Fri., 27 Mar. 0.0354 0.0308 0.0330
03:01-04:00, Fri., 27 Mar. 0.0353 0.0302 0.0329
02:01-03:00, Fri., 27 Mar. 0.0351 0.0304 0.0329
01:01-02:00, Fri., 27 Mar. 0.0351 0.0309 0.0328
00:01-01:00, Fri., 27 Mar. 0.0358 0.0306 0.0330
23:01-24:00, Thu., 26 Mar. 0.0351 0.0307 0.0329
22:01-23:00, Thu., 26 Mar. 0.0355 0.0306 0.0332
21:01-22:00, Thu., 26 Mar. 0.0357 0.0311 0.0334
20:01-21:00, Thu., 26 Mar. 0.0350 0.0304 0.0328
19:01-20:00, Thu., 26 Mar. 0.0344 0.0299 0.0325
18:01-19:00, Thu., 26 Mar. 0.0353 0.0302 0.0330
17:01-18:00, Thu., 26 Mar. 0.0375 0.0304 0.0332
16:01-17:00, Thu., 26 Mar. 0.0359 0.0323 0.0338
15:01-16:00, Thu., 26 Mar. 0.0370 0.0315 0.0340
14:01-15:00, Thu., 26 Mar. 0.0374 0.0322 0.0345
13:01-14:00, Thu., 26 Mar. 0.0368 0.0322 0.0344
12:01-13:00, Thu., 26 Mar. 0.0377 0.0328 0.0349
11:01-12:00, Thu., 26 Mar. 0.0383 0.0340 0.0362
10:01-11:00, Thu., 26 Mar. 0.0405 0.0351 0.0376
09:01-10:00, Thu., 26 Mar. 0.0402 0.0354 0.0377
08:01-09:00, Thu., 26 Mar. 0.0399 0.0349 0.0377
07:01-08:00, Thu., 26 Mar. 0.0415 0.0351 0.0386
06:01-07:00, Thu., 26 Mar. 0.0419 0.0366 0.0395
05:01-06:00, Thu., 26 Mar. 0.0404 0.0364 0.0383
04:01-05:00, Thu., 26 Mar. 0.0434 0.0377 0.0405
03:01-04:00, Thu., 26 Mar. 0.0433 0.0378 0.0407
02:01-03:00, Thu., 26 Mar. 0.0420 0.0375 0.0396
01:01-02:00, Thu., 26 Mar. 0.0419 0.0373 0.0393
00:01-01:00, Thu., 26 Mar. 0.0429 0.0372 0.0401
23:01-24:00, Wed., 25 Mar. 0.0446 0.0385 0.0409
22:01-23:00, Wed., 25 Mar. 0.0436 0.0375 0.0405
21:01-22:00, Wed., 25 Mar. 0.0429 0.0380 0.0405
20:01-21:00, Wed., 25 Mar. 0.0449 0.0400 0.0426
19:01-20:00, Wed., 25 Mar. 0.0436 0.0398 0.0414
18:01-19:00, Wed., 25 Mar. 0.0444 0.0374 0.0405
17:01-18:00, Wed., 25 Mar. 0.0414 0.0367 0.0388
16:01-17:00, Wed., 25 Mar. 0.0423 0.0375 0.0397
15:01-16:00, Wed., 25 Mar. 0.0440 0.0381 0.0410
14:01-15:00, Wed., 25 Mar. 0.0417 0.0368 0.0390
13:01-14:00, Wed., 25 Mar. 0.0400 0.0343 0.0373
12:01-13:00, Wed., 25 Mar. 0.0395 0.0338 0.0365
11:01-12:00, Wed., 25 Mar. 0.0367 0.0330 0.0348
10:01-11:00, Wed., 25 Mar. 0.0366 0.0319 0.0340
09:01-10:00, Wed., 25 Mar. 0.0363 0.0323 0.0341
08:01-09:00, Wed., 25 Mar. 0.0367 0.0322 0.0341
07:01-08:00, Wed., 25 Mar. 0.0367 0.0315 0.0341
06:01-07:00, Wed., 25 Mar. 0.0370 0.0320 0.0345
05:01-06:00, Wed., 25 Mar. 0.0367 0.0311 0.0341
04:01-05:00, Wed., 25 Mar. 0.0362 0.0313 0.0342
03:01-04:00, Wed., 25 Mar. 0.0364 0.0315 0.0341
02:01-03:00, Wed., 25 Mar. 0.0378 0.0312 0.0338
01:01-02:00, Wed., 25 Mar. 0.0357 0.0316 0.0337
00:01-01:00, Wed., 25 Mar. 0.0358 0.0313 0.0337
23:01-24:00, Tue., 24 Mar. 0.0363 0.0320 0.0337
22:01-23:00, Tue., 24 Mar. 0.0355 0.0307 0.0335
21:01-22:00, Tue., 24 Mar. 0.0358 0.0307 0.0334
20:01-21:00, Tue., 24 Mar. 0.0361 0.0314 0.0337
19:01-20:00, Tue., 24 Mar. 0.0370 0.0311 0.0337
18:01-19:00, Tue., 24 Mar. 0.0364 0.0308 0.0338
17:01-18:00, Tue., 24 Mar. 0.0360 0.0317 0.0337
16:01-17:00, Tue., 24 Mar. 0.0355 0.0320 0.0338
15:01-16:00, Tue., 24 Mar. 0.0363 0.0316 0.0339
14:01-15:00, Tue., 24 Mar. 0.0360 0.0317 0.0340
13:01-14:00, Tue., 24 Mar. 0.0364 0.0315 0.0338
12:01-13:00, Tue., 24 Mar. 0.0360 0.0315 0.0339
11:01-12:00, Tue., 24 Mar. 0.0363 0.0303 0.0337
10:01-11:00, Tue., 24 Mar. 0.0367 0.0324 0.0340
09:01-10:00, Tue., 24 Mar. 0.0377 0.0318 0.0341
08:01-09:00, Tue., 24 Mar. 0.0359 0.0315 0.0339
07:01-08:00, Tue., 24 Mar. 0.0365 0.0321 0.0345
06:01-07:00, Tue., 24 Mar. 0.0365 0.0322 0.0347
05:01-06:00, Tue., 24 Mar. 0.0366 0.0320 0.0345
04:01-05:00, Tue., 24 Mar. 0.0376 0.0315 0.0343
03:01-04:00, Tue., 24 Mar. 0.0359 0.0321 0.0341
02:01-03:00, Tue., 24 Mar. 0.0364 0.0322 0.0341
01:01-02:00, Tue., 24 Mar. 0.0361 0.0319 0.0340
00:01-01:00, Tue., 24 Mar. 0.0370 0.0318 0.0341
23:01-24:00, Mon., 23 Mar. 0.0366 0.0317 0.0342
22:01-23:00, Mon., 23 Mar. 0.0357 0.0319 0.0338
21:01-22:00, Mon., 23 Mar. 0.0369 0.0313 0.0343
20:01-21:00, Mon., 23 Mar. 0.0358 0.0318 0.0336
19:01-20:00, Mon., 23 Mar. 0.0363 0.0316 0.0336
18:01-19:00, Mon., 23 Mar. 0.0360 0.0310 0.0334
17:01-18:00, Mon., 23 Mar. 0.0353 0.0312 0.0335
16:01-17:00, Mon., 23 Mar. 0.0353 0.0310 0.0334
15:01-16:00, Mon., 23 Mar. 0.0370 0.0308 0.0335
14:01-15:00, Mon., 23 Mar. 0.0366 0.0318 0.0337
13:01-14:00, Mon., 23 Mar. 0.0368 0.0313 0.0335
12:01-13:00, Mon., 23 Mar. 0.0363 0.0316 0.0335
11:01-12:00, Mon., 23 Mar. 0.0364 0.0322 0.0342
10:01-11:00, Mon., 23 Mar. 0.0365 0.0331 0.0350
09:01-10:00, Mon., 23 Mar. 0.0379 0.0317 0.0351
08:01-09:00, Mon., 23 Mar. 0.0394 0.0344 0.0367
07:01-08:00, Mon., 23 Mar. 0.0400 0.0349 0.0368
06:01-07:00, Mon., 23 Mar. 0.0377 0.0331 0.0356
05:01-06:00, Mon., 23 Mar. 0.0370 0.0325 0.0349
04:01-05:00, Mon., 23 Mar. 0.0372 0.0322 0.0351
03:01-04:00, Mon., 23 Mar. 0.0369 0.0323 0.0348
02:01-03:00, Mon., 23 Mar. 0.0374 0.0329 0.0348
01:01-02:00, Mon., 23 Mar. 0.0374 0.0328 0.0349
00:01-01:00, Mon., 23 Mar. 0.0373 0.0321 0.0347
23:01-24:00, Sun., 22 Mar. 0.0372 0.0318 0.0345
22:01-23:00, Sun., 22 Mar. 0.0367 0.0316 0.0342
21:01-22:00, Sun., 22 Mar. 0.0360 0.0316 0.0339
20:01-21:00, Sun., 22 Mar. 0.0363 0.0311 0.0338
19:01-20:00, Sun., 22 Mar. 0.0376 0.0316 0.0341
18:01-19:00, Sun., 22 Mar. 0.0359 0.0316 0.0336
17:01-18:00, Sun., 22 Mar. 0.0365 0.0315 0.0341
16:01-17:00, Sun., 22 Mar. 0.0360 0.0315 0.0337
15:01-16:00, Sun., 22 Mar. 0.0368 0.0318 0.0338
14:01-15:00, Sun., 22 Mar. 0.0366 0.0316 0.0339
13:01-14:00, Sun., 22 Mar. 0.0359 0.0318 0.0340
12:01-13:00, Sun., 22 Mar. 0.0365 0.0321 0.0338
11:01-12:00, Sun., 22 Mar. 0.0375 0.0311 0.0341
10:01-11:00, Sun., 22 Mar. 0.0361 0.0324 0.0344
09:01-10:00, Sun., 22 Mar. 0.0370 0.0327 0.0350
08:01-09:00, Sun., 22 Mar. 0.0381 0.0328 0.0356
07:01-08:00, Sun., 22 Mar. 0.0391 0.0339 0.0364
06:01-07:00, Sun., 22 Mar. 0.0395 0.0330 0.0361
05:01-06:00, Sun., 22 Mar. 0.0390 0.0333 0.0358
04:01-05:00, Sun., 22 Mar. 0.0383 0.0325 0.0356
03:01-04:00, Sun., 22 Mar. 0.0374 0.0324 0.0352
02:01-03:00, Sun., 22 Mar. 0.0388 0.0323 0.0349
01:01-02:00, Sun., 22 Mar. 0.0374 0.0329 0.0350
00:01-01:00, Sun., 22 Mar. 0.0366 0.0322 0.0348
23:01-24:00, Sat., 21 Mar. 0.0371 0.0318 0.0348
22:01-23:00, Sat., 21 Mar. 0.0366 0.0325 0.0344
21:01-22:00, Sat., 21 Mar. 0.0385 0.0316 0.0346
20:01-21:00, Sat., 21 Mar. 0.0361 0.0311 0.0337
19:01-20:00, Sat., 21 Mar. 0.0364 0.0317 0.0338
18:01-19:00, Sat., 21 Mar. 0.0358 0.0314 0.0337
17:01-18:00, Sat., 21 Mar. 0.0374 0.0318 0.0338
16:01-17:00, Sat., 21 Mar. 0.0369 0.0318 0.0339
15:01-16:00, Sat., 21 Mar. 0.0363 0.0315 0.0336
14:01-15:00, Sat., 21 Mar. 0.0364 0.0316 0.0338
13:01-14:00, Sat., 21 Mar. 0.0360 0.0308 0.0337
12:01-13:00, Sat., 21 Mar. 0.0364 0.0318 0.0340
11:01-12:00, Sat., 21 Mar. 0.0361 0.0324 0.0343
10:01-11:00, Sat., 21 Mar. 0.0373 0.0323 0.0344
09:01-10:00, Sat., 21 Mar. 0.0367 0.0325 0.0343
08:01-09:00, Sat., 21 Mar. 0.0369 0.0325 0.0348
07:01-08:00, Sat., 21 Mar. 0.0374 0.0322 0.0343
06:01-07:00, Sat., 21 Mar. 0.0371 0.0321 0.0344
05:01-06:00, Sat., 21 Mar. 0.0370 0.0321 0.0342
04:01-05:00, Sat., 21 Mar. 0.0366 0.0311 0.0345
03:01-04:00, Sat., 21 Mar. 0.0374 0.0327 0.0347
02:01-03:00, Sat., 21 Mar. 0.0383 0.0319 0.0349
01:01-02:00, Sat., 21 Mar. 0.0374 0.0329 0.0352
00:01-01:00, Sat., 21 Mar. 0.0372 0.0331 0.0345
23:01-24:00, Fri., 20 Mar. 0.0363 0.0322 0.0343
22:01-23:00, Fri., 20 Mar. 0.0368 0.0323 0.0345
21:01-22:00, Fri., 20 Mar. 0.0370 0.0311 0.0342
20:01-21:00, Fri., 20 Mar. 0.0367 0.0329 0.0348
19:01-20:00, Fri., 20 Mar. 0.0396 0.0338 0.0362
18:01-19:00, Fri., 20 Mar. 0.0388 0.0345 0.0361
17:01-18:00, Fri., 20 Mar. 0.0409 0.0343 0.0370
16:01-17:00, Fri., 20 Mar. 0.0398 0.0337 0.0366
15:01-16:00, Fri., 20 Mar. 0.0372 0.0315 0.0346
14:01-15:00, Fri., 20 Mar. 0.0385 0.0318 0.0345
13:01-14:00, Fri., 20 Mar. 0.0377 0.0322 0.0352
12:01-13:00, Fri., 20 Mar. 0.0402 0.0336 0.0371
11:01-12:00, Fri., 20 Mar. 0.0423 0.0360 0.0388
10:01-11:00, Fri., 20 Mar. 0.0403 0.0335 0.0373
09:01-10:00, Fri., 20 Mar. 0.0384 0.0325 0.0356
08:01-09:00, Fri., 20 Mar. 0.0395 0.0340 0.0365
07:01-08:00, Fri., 20 Mar. 0.0406 0.0323 0.0356
06:01-07:00, Fri., 20 Mar. 0.0366 0.0324 0.0345
05:01-06:00, Fri., 20 Mar. 0.0368 0.0318 0.0349
04:01-05:00, Fri., 20 Mar. 0.0374 0.0315 0.0346
03:01-04:00, Fri., 20 Mar. 0.0372 0.0322 0.0343
02:01-03:00, Fri., 20 Mar. 0.0372 0.0311 0.0345
01:01-02:00, Fri., 20 Mar. 0.0374 0.0318 0.0347
00:01-01:00, Fri., 20 Mar. 0.0388 0.0336 0.0365
23:01-24:00, Thu., 19 Mar. 0.0450 0.0365 0.0406
22:01-23:00, Thu., 19 Mar. 0.0441 0.0322 0.0378
21:01-22:00, Thu., 19 Mar. 0.0360 0.0318 0.0338