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
11:01-12:00, Fri., 11 Sep. 0.0351 0.0294 0.0320
10:01-11:00, Fri., 11 Sep. 0.0355 0.0308 0.0327
09:01-10:00, Fri., 11 Sep. 0.0351 0.0304 0.0329
08:01-09:00, Fri., 11 Sep. 0.0358 0.0306 0.0325
07:01-08:00, Fri., 11 Sep. 0.0356 0.0311 0.0339
06:01-07:00, Fri., 11 Sep. 0.0384 0.0318 0.0354
05:01-06:00, Fri., 11 Sep. 0.0393 0.0322 0.0359
04:01-05:00, Fri., 11 Sep. 0.0375 0.0324 0.0349
03:01-04:00, Fri., 11 Sep. 0.0367 0.0311 0.0336
02:01-03:00, Fri., 11 Sep. 0.0352 0.0297 0.0323
01:01-02:00, Fri., 11 Sep. 0.0351 0.0300 0.0321
00:01-01:00, Fri., 11 Sep. 0.0356 0.0305 0.0330
23:01-24:00, Thu., 10 Sep. 0.0376 0.0327 0.0351
22:01-23:00, Thu., 10 Sep. 0.0405 0.0339 0.0375
21:01-22:00, Thu., 10 Sep. 0.0419 0.0363 0.0387
20:01-21:00, Thu., 10 Sep. 0.0409 0.0335 0.0373
19:01-20:00, Thu., 10 Sep. 0.0353 0.0309 0.0333
18:01-19:00, Thu., 10 Sep. 0.0368 0.0322 0.0345
17:01-18:00, Thu., 10 Sep. 0.0391 0.0327 0.0355
16:01-17:00, Thu., 10 Sep. 0.0363 0.0304 0.0329
15:01-16:00, Thu., 10 Sep. 0.0342 0.0292 0.0321
14:01-15:00, Thu., 10 Sep. 0.0343 0.0298 0.0320
13:01-14:00, Thu., 10 Sep. 0.0342 0.0295 0.0318
12:01-13:00, Thu., 10 Sep. 0.0347 0.0296 0.0318
11:01-12:00, Thu., 10 Sep. 0.0356 0.0295 0.0318
10:01-11:00, Thu., 10 Sep. 0.0347 0.0299 0.0324
09:01-10:00, Thu., 10 Sep. 0.0349 0.0303 0.0323
08:01-09:00, Thu., 10 Sep. 0.0353 0.0307 0.0326
07:01-08:00, Thu., 10 Sep. 0.0348 0.0306 0.0328
06:01-07:00, Thu., 10 Sep. 0.0339 0.0292 0.0316
05:01-06:00, Thu., 10 Sep. 0.0343 0.0304 0.0324
04:01-05:00, Thu., 10 Sep. 0.0383 0.0319 0.0349
03:01-04:00, Thu., 10 Sep. 0.0418 0.0351 0.0388
02:01-03:00, Thu., 10 Sep. 0.0430 0.0345 0.0391
01:01-02:00, Thu., 10 Sep. 0.0413 0.0355 0.0382
00:01-01:00, Thu., 10 Sep. 0.0423 0.0364 0.0391
23:01-24:00, Wed., 09 Sep. 0.0443 0.0369 0.0398
22:01-23:00, Wed., 09 Sep. 0.0449 0.0395 0.0420
21:01-22:00, Wed., 09 Sep. 0.0429 0.0356 0.0393
20:01-21:00, Wed., 09 Sep. 0.0445 0.0385 0.0411
19:01-20:00, Wed., 09 Sep. 0.0430 0.0346 0.0389
18:01-19:00, Wed., 09 Sep. 0.0377 0.0316 0.0348
17:01-18:00, Wed., 09 Sep. 0.0364 0.0308 0.0332
16:01-17:00, Wed., 09 Sep. 0.0356 0.0311 0.0337
15:01-16:00, Wed., 09 Sep. 0.0351 0.0296 0.0332
14:01-15:00, Wed., 09 Sep. 0.0346 0.0311 0.0325
13:01-14:00, Wed., 09 Sep. 0.0345 0.0293 0.0316
12:01-13:00, Wed., 09 Sep. 0.0345 0.0301 0.0321
11:01-12:00, Wed., 09 Sep. 0.0349 0.0299 0.0320
10:01-11:00, Wed., 09 Sep. 0.0350 0.0295 0.0318
09:01-10:00, Wed., 09 Sep. 0.0339 0.0295 0.0317
08:01-09:00, Wed., 09 Sep. 0.0341 0.0289 0.0318
07:01-08:00, Wed., 09 Sep. 0.0352 0.0300 0.0319
06:01-07:00, Wed., 09 Sep. 0.0342 0.0290 0.0320
05:01-06:00, Wed., 09 Sep. 0.0339 0.0290 0.0318
04:01-05:00, Wed., 09 Sep. 0.0343 0.0297 0.0318
03:01-04:00, Wed., 09 Sep. 0.0350 0.0294 0.0316
02:01-03:00, Wed., 09 Sep. 0.0344 0.0290 0.0320
01:01-02:00, Wed., 09 Sep. 0.0348 0.0304 0.0324
00:01-01:00, Wed., 09 Sep. 0.0349 0.0305 0.0330
23:01-24:00, Tue., 08 Sep. 0.0363 0.0306 0.0332
22:01-23:00, Tue., 08 Sep. 0.0354 0.0308 0.0330
21:01-22:00, Tue., 08 Sep. 0.0367 0.0309 0.0343
20:01-21:00, Tue., 08 Sep. 0.0445 0.0344 0.0391
19:01-20:00, Tue., 08 Sep. 0.0444 0.0374 0.0412
18:01-19:00, Tue., 08 Sep. 0.0429 0.0330 0.0377
17:01-18:00, Tue., 08 Sep. 0.0360 0.0315 0.0340
16:01-17:00, Tue., 08 Sep. 0.0374 0.0311 0.0344
15:01-16:00, Tue., 08 Sep. 0.0336 0.0299 0.0320
14:01-15:00, Tue., 08 Sep. 0.0345 0.0308 0.0322
13:01-14:00, Tue., 08 Sep. 0.0342 0.0296 0.0320
12:01-13:00, Tue., 08 Sep. 0.0343 0.0300 0.0320
11:01-12:00, Tue., 08 Sep. 0.0339 0.0292 0.0321
10:01-11:00, Tue., 08 Sep. 0.0338 0.0306 0.0320
09:01-10:00, Tue., 08 Sep. 0.0349 0.0297 0.0320
08:01-09:00, Tue., 08 Sep. 0.0345 0.0293 0.0322
07:01-08:00, Tue., 08 Sep. 0.0351 0.0300 0.0324
06:01-07:00, Tue., 08 Sep. 0.0353 0.0307 0.0329
05:01-06:00, Tue., 08 Sep. 0.0354 0.0301 0.0325
04:01-05:00, Tue., 08 Sep. 0.0343 0.0299 0.0323
03:01-04:00, Tue., 08 Sep. 0.0348 0.0310 0.0328
02:01-03:00, Tue., 08 Sep. 0.0352 0.0301 0.0328
01:01-02:00, Tue., 08 Sep. 0.0345 0.0297 0.0327
00:01-01:00, Tue., 08 Sep. 0.0363 0.0308 0.0330
23:01-24:00, Mon., 07 Sep. 0.0353 0.0305 0.0329
22:01-23:00, Mon., 07 Sep. 0.0352 0.0305 0.0327
21:01-22:00, Mon., 07 Sep. 0.0348 0.0307 0.0326
20:01-21:00, Mon., 07 Sep. 0.0347 0.0304 0.0325
19:01-20:00, Mon., 07 Sep. 0.0349 0.0307 0.0326
18:01-19:00, Mon., 07 Sep. 0.0361 0.0294 0.0325
17:01-18:00, Mon., 07 Sep. 0.0349 0.0296 0.0327
16:01-17:00, Mon., 07 Sep. 0.0362 0.0318 0.0339
15:01-16:00, Mon., 07 Sep. 0.0355 0.0312 0.0338
14:01-15:00, Mon., 07 Sep. 0.0363 0.0319 0.0340
13:01-14:00, Mon., 07 Sep. 0.0354 0.0310 0.0332
12:01-13:00, Mon., 07 Sep. 0.0356 0.0306 0.0332
11:01-12:00, Mon., 07 Sep. 0.0355 0.0303 0.0333
10:01-11:00, Mon., 07 Sep. 0.0353 0.0304 0.0327
09:01-10:00, Mon., 07 Sep. 0.0345 0.0307 0.0327
08:01-09:00, Mon., 07 Sep. 0.0355 0.0311 0.0333
07:01-08:00, Mon., 07 Sep. 0.0372 0.0318 0.0341
06:01-07:00, Mon., 07 Sep. 0.0387 0.0322 0.0358
05:01-06:00, Mon., 07 Sep. 0.0419 0.0362 0.0389
04:01-05:00, Mon., 07 Sep. 0.0444 0.0353 0.0384
03:01-04:00, Mon., 07 Sep. 0.0395 0.0346 0.0368
02:01-03:00, Mon., 07 Sep. 0.0397 0.0357 0.0374
01:01-02:00, Mon., 07 Sep. 0.0382 0.0337 0.0362
00:01-01:00, Mon., 07 Sep. 0.0377 0.0322 0.0352
23:01-24:00, Sun., 06 Sep. 0.0381 0.0332 0.0354
22:01-23:00, Sun., 06 Sep. 0.0379 0.0327 0.0352
21:01-22:00, Sun., 06 Sep. 0.0380 0.0334 0.0358
20:01-21:00, Sun., 06 Sep. 0.0388 0.0339 0.0363
19:01-20:00, Sun., 06 Sep. 0.0400 0.0350 0.0370
18:01-19:00, Sun., 06 Sep. 0.0405 0.0353 0.0374
17:01-18:00, Sun., 06 Sep. 0.0387 0.0343 0.0361
16:01-17:00, Sun., 06 Sep. 0.0378 0.0335 0.0356
15:01-16:00, Sun., 06 Sep. 0.0390 0.0326 0.0361
14:01-15:00, Sun., 06 Sep. 0.0390 0.0336 0.0363
13:01-14:00, Sun., 06 Sep. 0.0397 0.0341 0.0365
12:01-13:00, Sun., 06 Sep. 0.0384 0.0339 0.0360
11:01-12:00, Sun., 06 Sep. 0.0423 0.0341 0.0383
10:01-11:00, Sun., 06 Sep. 0.0447 0.0384 0.0411
09:01-10:00, Sun., 06 Sep. 0.0425 0.0372 0.0402
08:01-09:00, Sun., 06 Sep. 0.0425 0.0382 0.0400
07:01-08:00, Sun., 06 Sep. 0.0412 0.0343 0.0388
06:01-07:00, Sun., 06 Sep. 0.0400 0.0343 0.0376
05:01-06:00, Sun., 06 Sep. 0.0376 0.0302 0.0336
04:01-05:00, Sun., 06 Sep. 0.0349 0.0298 0.0327
03:01-04:00, Sun., 06 Sep. 0.0349 0.0301 0.0326
02:01-03:00, Sun., 06 Sep. 0.0349 0.0306 0.0326
01:01-02:00, Sun., 06 Sep. 0.0344 0.0300 0.0324
00:01-01:00, Sun., 06 Sep. 0.0356 0.0298 0.0324
23:01-24:00, Sat., 05 Sep. 0.0347 0.0295 0.0324
22:01-23:00, Sat., 05 Sep. 0.0341 0.0301 0.0321
21:01-22:00, Sat., 05 Sep. 0.0346 0.0307 0.0327
20:01-21:00, Sat., 05 Sep. 0.0350 0.0305 0.0328
19:01-20:00, Sat., 05 Sep. 0.0353 0.0311 0.0329
18:01-19:00, Sat., 05 Sep. 0.0349 0.0310 0.0329
17:01-18:00, Sat., 05 Sep. 0.0349 0.0301 0.0328
16:01-17:00, Sat., 05 Sep. 0.0354 0.0308 0.0331
15:01-16:00, Sat., 05 Sep. 0.0349 0.0307 0.0326
14:01-15:00, Sat., 05 Sep. 0.0353 0.0299 0.0329
13:01-14:00, Sat., 05 Sep. 0.0346 0.0304 0.0327
12:01-13:00, Sat., 05 Sep. 0.0353 0.0297 0.0328
11:01-12:00, Sat., 05 Sep. 0.0367 0.0311 0.0336
10:01-11:00, Sat., 05 Sep. 0.0357 0.0309 0.0330
09:01-10:00, Sat., 05 Sep. 0.0363 0.0304 0.0329
08:01-09:00, Sat., 05 Sep. 0.0363 0.0315 0.0337
07:01-08:00, Sat., 05 Sep. 0.0353 0.0306 0.0332
06:01-07:00, Sat., 05 Sep. 0.0367 0.0313 0.0339
05:01-06:00, Sat., 05 Sep. 0.0381 0.0334 0.0356
04:01-05:00, Sat., 05 Sep. 0.0388 0.0328 0.0355
03:01-04:00, Sat., 05 Sep. 0.0375 0.0326 0.0353
02:01-03:00, Sat., 05 Sep. 0.0367 0.0326 0.0345
01:01-02:00, Sat., 05 Sep. 0.0367 0.0325 0.0347
00:01-01:00, Sat., 05 Sep. 0.0360 0.0307 0.0337
23:01-24:00, Fri., 04 Sep. 0.0362 0.0315 0.0338
22:01-23:00, Fri., 04 Sep. 0.0375 0.0315 0.0341
21:01-22:00, Fri., 04 Sep. 0.0367 0.0318 0.0342
20:01-21:00, Fri., 04 Sep. 0.0374 0.0318 0.0342
19:01-20:00, Fri., 04 Sep. 0.0365 0.0327 0.0347
18:01-19:00, Fri., 04 Sep. 0.0367 0.0314 0.0346
17:01-18:00, Fri., 04 Sep. 0.0368 0.0320 0.0343
16:01-17:00, Fri., 04 Sep. 0.0377 0.0318 0.0345
15:01-16:00, Fri., 04 Sep. 0.0379 0.0325 0.0348
14:01-15:00, Fri., 04 Sep. 0.0366 0.0315 0.0343
13:01-14:00, Fri., 04 Sep. 0.0362 0.0318 0.0344
12:01-13:00, Fri., 04 Sep. 0.0370 0.0325 0.0349
11:01-12:00, Fri., 04 Sep. 0.0378 0.0322 0.0350
10:01-11:00, Fri., 04 Sep. 0.0388 0.0319 0.0351
09:01-10:00, Fri., 04 Sep. 0.0364 0.0332 0.0350
08:01-09:00, Fri., 04 Sep. 0.0373 0.0333 0.0351
07:01-08:00, Fri., 04 Sep. 0.0389 0.0322 0.0354
06:01-07:00, Fri., 04 Sep. 0.0382 0.0327 0.0352
05:01-06:00, Fri., 04 Sep. 0.0362 0.0313 0.0341
04:01-05:00, Fri., 04 Sep. 0.0362 0.0309 0.0338
03:01-04:00, Fri., 04 Sep. 0.0367 0.0303 0.0339
02:01-03:00, Fri., 04 Sep. 0.0367 0.0312 0.0337
01:01-02:00, Fri., 04 Sep. 0.0367 0.0315 0.0340
00:01-01:00, Fri., 04 Sep. 0.0361 0.0322 0.0339
23:01-24:00, Thu., 03 Sep. 0.0355 0.0313 0.0336
22:01-23:00, Thu., 03 Sep. 0.0358 0.0311 0.0335
21:01-22:00, Thu., 03 Sep. 0.0353 0.0299 0.0331
20:01-21:00, Thu., 03 Sep. 0.0370 0.0306 0.0335
19:01-20:00, Thu., 03 Sep. 0.0359 0.0309 0.0329
18:01-19:00, Thu., 03 Sep. 0.0360 0.0315 0.0335
17:01-18:00, Thu., 03 Sep. 0.0355 0.0307 0.0331
16:01-17:00, Thu., 03 Sep. 0.0358 0.0311 0.0331
15:01-16:00, Thu., 03 Sep. 0.0357 0.0319 0.0341
14:01-15:00, Thu., 03 Sep. 0.0369 0.0326 0.0346
13:01-14:00, Thu., 03 Sep. 0.0360 0.0317 0.0337
12:01-13:00, Thu., 03 Sep. 0.0350 0.0314 0.0332
11:01-12:00, Thu., 03 Sep. 0.0373 0.0319 0.0337
10:01-11:00, Thu., 03 Sep. 0.0358 0.0304 0.0334
09:01-10:00, Thu., 03 Sep. 0.0358 0.0307 0.0335
08:01-09:00, Thu., 03 Sep. 0.0359 0.0318 0.0335
07:01-08:00, Thu., 03 Sep. 0.0370 0.0320 0.0342
06:01-07:00, Thu., 03 Sep. 0.0381 0.0324 0.0350
05:01-06:00, Thu., 03 Sep. 0.0370 0.0325 0.0351
04:01-05:00, Thu., 03 Sep. 0.0377 0.0329 0.0350
03:01-04:00, Thu., 03 Sep. 0.0356 0.0311 0.0335
02:01-03:00, Thu., 03 Sep. 0.0364 0.0306 0.0333
01:01-02:00, Thu., 03 Sep. 0.0349 0.0307 0.0330
00:01-01:00, Thu., 03 Sep. 0.0353 0.0302 0.0329
23:01-24:00, Wed., 02 Sep. 0.0359 0.0295 0.0332
22:01-23:00, Wed., 02 Sep. 0.0356 0.0305 0.0333
21:01-22:00, Wed., 02 Sep. 0.0357 0.0307 0.0331
20:01-21:00, Wed., 02 Sep. 0.0350 0.0308 0.0330
19:01-20:00, Wed., 02 Sep. 0.0359 0.0297 0.0330
18:01-19:00, Wed., 02 Sep. 0.0347 0.0310 0.0329
17:01-18:00, Wed., 02 Sep. 0.0349 0.0303 0.0329
16:01-17:00, Wed., 02 Sep. 0.0356 0.0305 0.0327
15:01-16:00, Wed., 02 Sep. 0.0367 0.0301 0.0330
14:01-15:00, Wed., 02 Sep. 0.0356 0.0298 0.0326
13:01-14:00, Wed., 02 Sep. 0.0348 0.0302 0.0325
12:01-13:00, Wed., 02 Sep. 0.0363 0.0311 0.0329
11:01-12:00, Wed., 02 Sep. 0.0356 0.0308 0.0331
10:01-11:00, Wed., 02 Sep. 0.0351 0.0304 0.0328
09:01-10:00, Wed., 02 Sep. 0.0349 0.0308 0.0330
08:01-09:00, Wed., 02 Sep. 0.0356 0.0314 0.0338
07:01-08:00, Wed., 02 Sep. 0.0374 0.0327 0.0348
06:01-07:00, Wed., 02 Sep. 0.0372 0.0317 0.0348
05:01-06:00, Wed., 02 Sep. 0.0367 0.0322 0.0344
04:01-05:00, Wed., 02 Sep. 0.0365 0.0319 0.0345
03:01-04:00, Wed., 02 Sep. 0.0383 0.0330 0.0357
02:01-03:00, Wed., 02 Sep. 0.0412 0.0324 0.0373
01:01-02:00, Wed., 02 Sep. 0.0368 0.0325 0.0344
00:01-01:00, Wed., 02 Sep. 0.0379 0.0301 0.0340
23:01-24:00, Tue., 01 Sep. 0.0379 0.0319 0.0347
22:01-23:00, Tue., 01 Sep. 0.0387 0.0336 0.0358
21:01-22:00, Tue., 01 Sep. 0.0364 0.0321 0.0343
20:01-21:00, Tue., 01 Sep. 0.0360 0.0317 0.0339
19:01-20:00, Tue., 01 Sep. 0.0356 0.0315 0.0337
18:01-19:00, Tue., 01 Sep. 0.0360 0.0302 0.0336
17:01-18:00, Tue., 01 Sep. 0.0358 0.0314 0.0332
16:01-17:00, Tue., 01 Sep. 0.0349 0.0305 0.0331
15:01-16:00, Tue., 01 Sep. 0.0354 0.0310 0.0330
14:01-15:00, Tue., 01 Sep. 0.0354 0.0308 0.0330
13:01-14:00, Tue., 01 Sep. 0.0350 0.0310 0.0331
12:01-13:00, Tue., 01 Sep. 0.0354 0.0308 0.0330