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
07:01-08:00, Sat., 22 Aug. 0.0356 0.0318 0.0338
06:01-07:00, Sat., 22 Aug. 0.0367 0.0318 0.0338
05:01-06:00, Sat., 22 Aug. 0.0353 0.0313 0.0331
04:01-05:00, Sat., 22 Aug. 0.0361 0.0309 0.0336
03:01-04:00, Sat., 22 Aug. 0.0367 0.0308 0.0335
02:01-03:00, Sat., 22 Aug. 0.0353 0.0311 0.0332
01:01-02:00, Sat., 22 Aug. 0.0343 0.0295 0.0328
00:01-01:00, Sat., 22 Aug. 0.0350 0.0310 0.0330
23:01-24:00, Fri., 21 Aug. 0.0361 0.0308 0.0330
22:01-23:00, Fri., 21 Aug. 0.0373 0.0318 0.0343
21:01-22:00, Fri., 21 Aug. 0.0443 0.0346 0.0391
20:01-21:00, Fri., 21 Aug. 0.0489 0.0419 0.0455
19:01-20:00, Fri., 21 Aug. 0.0471 0.0308 0.0378
18:01-19:00, Fri., 21 Aug. 0.0349 0.0301 0.0325
17:01-18:00, Fri., 21 Aug. 0.0357 0.0301 0.0325
16:01-17:00, Fri., 21 Aug. 0.0351 0.0301 0.0324
15:01-16:00, Fri., 21 Aug. 0.0348 0.0301 0.0326
14:01-15:00, Fri., 21 Aug. 0.0352 0.0299 0.0327
13:01-14:00, Fri., 21 Aug. 0.0350 0.0308 0.0326
12:01-13:00, Fri., 21 Aug. 0.0349 0.0304 0.0325
11:01-12:00, Fri., 21 Aug. 0.0349 0.0301 0.0326
10:01-11:00, Fri., 21 Aug. 0.0353 0.0306 0.0329
09:01-10:00, Fri., 21 Aug. 0.0360 0.0311 0.0335
08:01-09:00, Fri., 21 Aug. 0.0366 0.0316 0.0341
07:01-08:00, Fri., 21 Aug. 0.0363 0.0312 0.0340
06:01-07:00, Fri., 21 Aug. 0.0367 0.0318 0.0343
05:01-06:00, Fri., 21 Aug. 0.0365 0.0315 0.0340
04:01-05:00, Fri., 21 Aug. 0.0361 0.0312 0.0337
03:01-04:00, Fri., 21 Aug. 0.0358 0.0315 0.0337
02:01-03:00, Fri., 21 Aug. 0.0360 0.0315 0.0336
01:01-02:00, Fri., 21 Aug. 0.0348 0.0308 0.0332
00:01-01:00, Fri., 21 Aug. 0.0353 0.0304 0.0327
23:01-24:00, Thu., 20 Aug. 0.0352 0.0305 0.0329
22:01-23:00, Thu., 20 Aug. 0.0378 0.0314 0.0337
21:01-22:00, Thu., 20 Aug. 0.0372 0.0319 0.0341
20:01-21:00, Thu., 20 Aug. 0.0363 0.0302 0.0327
19:01-20:00, Thu., 20 Aug. 0.0346 0.0300 0.0322
18:01-19:00, Thu., 20 Aug. 0.0343 0.0295 0.0322
17:01-18:00, Thu., 20 Aug. 0.0348 0.0302 0.0322
16:01-17:00, Thu., 20 Aug. 0.0344 0.0298 0.0320
15:01-16:00, Thu., 20 Aug. 0.0338 0.0298 0.0322
14:01-15:00, Thu., 20 Aug. 0.0346 0.0302 0.0323
13:01-14:00, Thu., 20 Aug. 0.0343 0.0294 0.0323
12:01-13:00, Thu., 20 Aug. 0.0353 0.0297 0.0324
11:01-12:00, Thu., 20 Aug. 0.0347 0.0301 0.0328
10:01-11:00, Thu., 20 Aug. 0.0359 0.0302 0.0328
09:01-10:00, Thu., 20 Aug. 0.0357 0.0312 0.0338
08:01-09:00, Thu., 20 Aug. 0.0367 0.0325 0.0346
07:01-08:00, Thu., 20 Aug. 0.0375 0.0334 0.0351
06:01-07:00, Thu., 20 Aug. 0.0381 0.0315 0.0349
05:01-06:00, Thu., 20 Aug. 0.0375 0.0324 0.0347
04:01-05:00, Thu., 20 Aug. 0.0373 0.0317 0.0340
03:01-04:00, Thu., 20 Aug. 0.0348 0.0309 0.0330
02:01-03:00, Thu., 20 Aug. 0.0343 0.0293 0.0327
01:01-02:00, Thu., 20 Aug. 0.0346 0.0309 0.0326
00:01-01:00, Thu., 20 Aug. 0.0349 0.0306 0.0323
23:01-24:00, Wed., 19 Aug. 0.0342 0.0296 0.0320
22:01-23:00, Wed., 19 Aug. 0.0348 0.0299 0.0323
21:01-22:00, Wed., 19 Aug. 0.0358 0.0303 0.0323
20:01-21:00, Wed., 19 Aug. 0.0339 0.0304 0.0322
19:01-20:00, Wed., 19 Aug. 0.0343 0.0303 0.0322
18:01-19:00, Wed., 19 Aug. 0.0344 0.0294 0.0321
17:01-18:00, Wed., 19 Aug. 0.0343 0.0298 0.0322
16:01-17:00, Wed., 19 Aug. 0.0343 0.0301 0.0319
15:01-16:00, Wed., 19 Aug. 0.0349 0.0300 0.0318
14:01-15:00, Wed., 19 Aug. 0.0337 0.0284 0.0319
13:01-14:00, Wed., 19 Aug. 0.0340 0.0297 0.0320
12:01-13:00, Wed., 19 Aug. 0.0345 0.0295 0.0322
11:01-12:00, Wed., 19 Aug. 0.0346 0.0301 0.0323
10:01-11:00, Wed., 19 Aug. 0.0353 0.0299 0.0323
09:01-10:00, Wed., 19 Aug. 0.0349 0.0300 0.0326
08:01-09:00, Wed., 19 Aug. 0.0360 0.0308 0.0333
07:01-08:00, Wed., 19 Aug. 0.0388 0.0317 0.0344
06:01-07:00, Wed., 19 Aug. 0.0373 0.0323 0.0345
05:01-06:00, Wed., 19 Aug. 0.0360 0.0319 0.0339
04:01-05:00, Wed., 19 Aug. 0.0354 0.0310 0.0335
03:01-04:00, Wed., 19 Aug. 0.0352 0.0311 0.0328
02:01-03:00, Wed., 19 Aug. 0.0360 0.0301 0.0325
01:01-02:00, Wed., 19 Aug. 0.0351 0.0301 0.0323
00:01-01:00, Wed., 19 Aug. 0.0339 0.0305 0.0322
23:01-24:00, Tue., 18 Aug. 0.0356 0.0294 0.0323
22:01-23:00, Tue., 18 Aug. 0.0346 0.0304 0.0323
21:01-22:00, Tue., 18 Aug. 0.0344 0.0298 0.0320
20:01-21:00, Tue., 18 Aug. 0.0345 0.0298 0.0320
19:01-20:00, Tue., 18 Aug. 0.0346 0.0287 0.0320
18:01-19:00, Tue., 18 Aug. 0.0355 0.0294 0.0319
17:01-18:00, Tue., 18 Aug. 0.0346 0.0301 0.0320
16:01-17:00, Tue., 18 Aug. 0.0340 0.0301 0.0317
15:01-16:00, Tue., 18 Aug. 0.0339 0.0299 0.0319
14:01-15:00, Tue., 18 Aug. 0.0341 0.0290 0.0317
13:01-14:00, Tue., 18 Aug. 0.0349 0.0299 0.0320
12:01-13:00, Tue., 18 Aug. 0.0342 0.0296 0.0320
11:01-12:00, Tue., 18 Aug. 0.0345 0.0303 0.0324
10:01-11:00, Tue., 18 Aug. 0.0353 0.0298 0.0325
09:01-10:00, Tue., 18 Aug. 0.0346 0.0297 0.0323
08:01-09:00, Tue., 18 Aug. 0.0347 0.0307 0.0327
07:01-08:00, Tue., 18 Aug. 0.0377 0.0309 0.0333
06:01-07:00, Tue., 18 Aug. 0.0367 0.0303 0.0333
05:01-06:00, Tue., 18 Aug. 0.0353 0.0302 0.0331
04:01-05:00, Tue., 18 Aug. 0.0359 0.0318 0.0338
03:01-04:00, Tue., 18 Aug. 0.0351 0.0309 0.0330
02:01-03:00, Tue., 18 Aug. 0.0353 0.0302 0.0330
01:01-02:00, Tue., 18 Aug. 0.0349 0.0307 0.0327
00:01-01:00, Tue., 18 Aug. 0.0346 0.0303 0.0323
23:01-24:00, Mon., 17 Aug. 0.0343 0.0296 0.0324
22:01-23:00, Mon., 17 Aug. 0.0342 0.0297 0.0319
21:01-22:00, Mon., 17 Aug. 0.0341 0.0291 0.0317
20:01-21:00, Mon., 17 Aug. 0.0348 0.0300 0.0319
19:01-20:00, Mon., 17 Aug. 0.0348 0.0299 0.0321
18:01-19:00, Mon., 17 Aug. 0.0340 0.0287 0.0320
17:01-18:00, Mon., 17 Aug. 0.0341 0.0292 0.0321
16:01-17:00, Mon., 17 Aug. 0.0359 0.0293 0.0319
15:01-16:00, Mon., 17 Aug. 0.0336 0.0287 0.0317
14:01-15:00, Mon., 17 Aug. 0.0343 0.0292 0.0321
13:01-14:00, Mon., 17 Aug. 0.0341 0.0299 0.0320
12:01-13:00, Mon., 17 Aug. 0.0348 0.0295 0.0320
11:01-12:00, Mon., 17 Aug. 0.0349 0.0294 0.0318
10:01-11:00, Mon., 17 Aug. 0.0347 0.0297 0.0318
09:01-10:00, Mon., 17 Aug. 0.0339 0.0298 0.0321
08:01-09:00, Mon., 17 Aug. 0.0361 0.0304 0.0324
07:01-08:00, Mon., 17 Aug. 0.0345 0.0287 0.0323
06:01-07:00, Mon., 17 Aug. 0.0345 0.0301 0.0324
05:01-06:00, Mon., 17 Aug. 0.0344 0.0306 0.0327
04:01-05:00, Mon., 17 Aug. 0.0349 0.0300 0.0327
03:01-04:00, Mon., 17 Aug. 0.0350 0.0305 0.0325
02:01-03:00, Mon., 17 Aug. 0.0345 0.0298 0.0323
01:01-02:00, Mon., 17 Aug. 0.0347 0.0292 0.0324
00:01-01:00, Mon., 17 Aug. 0.0350 0.0297 0.0319
23:01-24:00, Sun., 16 Aug. 0.0345 0.0303 0.0320
22:01-23:00, Sun., 16 Aug. 0.0340 0.0289 0.0315
21:01-22:00, Sun., 16 Aug. 0.0341 0.0287 0.0316
20:01-21:00, Sun., 16 Aug. 0.0336 0.0290 0.0315
19:01-20:00, Sun., 16 Aug. 0.0335 0.0288 0.0315
18:01-19:00, Sun., 16 Aug. 0.0341 0.0303 0.0322
17:01-18:00, Sun., 16 Aug. 0.0350 0.0303 0.0327
16:01-17:00, Sun., 16 Aug. 0.0346 0.0309 0.0327
15:01-16:00, Sun., 16 Aug. 0.0350 0.0283 0.0322
14:01-15:00, Sun., 16 Aug. 0.0345 0.0290 0.0319
13:01-14:00, Sun., 16 Aug. 0.0341 0.0297 0.0321
12:01-13:00, Sun., 16 Aug. 0.0346 0.0304 0.0324
11:01-12:00, Sun., 16 Aug. 0.0348 0.0287 0.0321
10:01-11:00, Sun., 16 Aug. 0.0350 0.0296 0.0319
09:01-10:00, Sun., 16 Aug. 0.0343 0.0301 0.0321
08:01-09:00, Sun., 16 Aug. 0.0344 0.0300 0.0324
07:01-08:00, Sun., 16 Aug. 0.0356 0.0306 0.0326
06:01-07:00, Sun., 16 Aug. 0.0349 0.0297 0.0325
05:01-06:00, Sun., 16 Aug. 0.0344 0.0311 0.0324
04:01-05:00, Sun., 16 Aug. 0.0360 0.0303 0.0323
03:01-04:00, Sun., 16 Aug. 0.0352 0.0297 0.0321
02:01-03:00, Sun., 16 Aug. 0.0343 0.0301 0.0321
01:01-02:00, Sun., 16 Aug. 0.0346 0.0291 0.0319
00:01-01:00, Sun., 16 Aug. 0.0344 0.0281 0.0318
23:01-24:00, Sat., 15 Aug. 0.0347 0.0294 0.0320
22:01-23:00, Sat., 15 Aug. 0.0336 0.0301 0.0319
21:01-22:00, Sat., 15 Aug. 0.0338 0.0286 0.0317
20:01-21:00, Sat., 15 Aug. 0.0332 0.0297 0.0317
19:01-20:00, Sat., 15 Aug. 0.0349 0.0294 0.0318
18:01-19:00, Sat., 15 Aug. 0.0350 0.0290 0.0318
17:01-18:00, Sat., 15 Aug. 0.0334 0.0294 0.0315
16:01-17:00, Sat., 15 Aug. 0.0340 0.0295 0.0319
15:01-16:00, Sat., 15 Aug. 0.0343 0.0299 0.0318
14:01-15:00, Sat., 15 Aug. 0.0356 0.0301 0.0321
13:01-14:00, Sat., 15 Aug. 0.0339 0.0297 0.0318
12:01-13:00, Sat., 15 Aug. 0.0344 0.0297 0.0321
11:01-12:00, Sat., 15 Aug. 0.0346 0.0295 0.0316
10:01-11:00, Sat., 15 Aug. 0.0338 0.0293 0.0315
09:01-10:00, Sat., 15 Aug. 0.0350 0.0292 0.0316
08:01-09:00, Sat., 15 Aug. 0.0343 0.0288 0.0317
07:01-08:00, Sat., 15 Aug. 0.0355 0.0288 0.0318
06:01-07:00, Sat., 15 Aug. 0.0346 0.0297 0.0319
05:01-06:00, Sat., 15 Aug. 0.0353 0.0306 0.0326
04:01-05:00, Sat., 15 Aug. 0.0353 0.0305 0.0334
03:01-04:00, Sat., 15 Aug. 0.0366 0.0308 0.0340
02:01-03:00, Sat., 15 Aug. 0.0360 0.0296 0.0326
01:01-02:00, Sat., 15 Aug. 0.0348 0.0300 0.0322
00:01-01:00, Sat., 15 Aug. 0.0343 0.0294 0.0320
23:01-24:00, Fri., 14 Aug. 0.0340 0.0302 0.0323
22:01-23:00, Fri., 14 Aug. 0.0347 0.0302 0.0327
21:01-22:00, Fri., 14 Aug. 0.0346 0.0295 0.0322
20:01-21:00, Fri., 14 Aug. 0.0349 0.0291 0.0317
19:01-20:00, Fri., 14 Aug. 0.0344 0.0293 0.0316
18:01-19:00, Fri., 14 Aug. 0.0343 0.0291 0.0318
17:01-18:00, Fri., 14 Aug. 0.0347 0.0303 0.0321
16:01-17:00, Fri., 14 Aug. 0.0346 0.0294 0.0319
15:01-16:00, Fri., 14 Aug. 0.0347 0.0301 0.0321
14:01-15:00, Fri., 14 Aug. 0.0345 0.0303 0.0320
13:01-14:00, Fri., 14 Aug. 0.0350 0.0291 0.0321
12:01-13:00, Fri., 14 Aug. 0.0339 0.0305 0.0322
11:01-12:00, Fri., 14 Aug. 0.0347 0.0300 0.0322
10:01-11:00, Fri., 14 Aug. 0.0349 0.0303 0.0322
09:01-10:00, Fri., 14 Aug. 0.0337 0.0304 0.0321
08:01-09:00, Fri., 14 Aug. 0.0353 0.0308 0.0323
07:01-08:00, Fri., 14 Aug. 0.0353 0.0303 0.0324
06:01-07:00, Fri., 14 Aug. 0.0349 0.0306 0.0327
05:01-06:00, Fri., 14 Aug. 0.0352 0.0291 0.0323
04:01-05:00, Fri., 14 Aug. 0.0341 0.0301 0.0322
03:01-04:00, Fri., 14 Aug. 0.0346 0.0305 0.0325
02:01-03:00, Fri., 14 Aug. 0.0341 0.0303 0.0321
01:01-02:00, Fri., 14 Aug. 0.0371 0.0315 0.0338
00:01-01:00, Fri., 14 Aug. 0.0368 0.0311 0.0342
23:01-24:00, Thu., 13 Aug. 0.0365 0.0322 0.0344
22:01-23:00, Thu., 13 Aug. 0.0378 0.0308 0.0340
21:01-22:00, Thu., 13 Aug. 0.0353 0.0306 0.0331
20:01-21:00, Thu., 13 Aug. 0.0343 0.0301 0.0322
19:01-20:00, Thu., 13 Aug. 0.0343 0.0298 0.0319
18:01-19:00, Thu., 13 Aug. 0.0343 0.0294 0.0320
17:01-18:00, Thu., 13 Aug. 0.0347 0.0308 0.0326
16:01-17:00, Thu., 13 Aug. 0.0368 0.0304 0.0332
15:01-16:00, Thu., 13 Aug. 0.0350 0.0294 0.0323
14:01-15:00, Thu., 13 Aug. 0.0346 0.0301 0.0325
13:01-14:00, Thu., 13 Aug. 0.0343 0.0301 0.0324
12:01-13:00, Thu., 13 Aug. 0.0353 0.0310 0.0329
11:01-12:00, Thu., 13 Aug. 0.0356 0.0308 0.0334
10:01-11:00, Thu., 13 Aug. 0.0360 0.0306 0.0329
09:01-10:00, Thu., 13 Aug. 0.0354 0.0292 0.0332
08:01-09:00, Thu., 13 Aug. 0.0367 0.0308 0.0336
07:01-08:00, Thu., 13 Aug. 0.0354 0.0313 0.0332
06:01-07:00, Thu., 13 Aug. 0.0360 0.0299 0.0334
05:01-06:00, Thu., 13 Aug. 0.0353 0.0314 0.0335
04:01-05:00, Thu., 13 Aug. 0.0360 0.0305 0.0328
03:01-04:00, Thu., 13 Aug. 0.0350 0.0305 0.0323
02:01-03:00, Thu., 13 Aug. 0.0343 0.0296 0.0323
01:01-02:00, Thu., 13 Aug. 0.0339 0.0303 0.0322
00:01-01:00, Thu., 13 Aug. 0.0346 0.0288 0.0322
23:01-24:00, Wed., 12 Aug. 0.0349 0.0299 0.0323
22:01-23:00, Wed., 12 Aug. 0.0345 0.0306 0.0325
21:01-22:00, Wed., 12 Aug. 0.0352 0.0297 0.0323
20:01-21:00, Wed., 12 Aug. 0.0343 0.0299 0.0320
19:01-20:00, Wed., 12 Aug. 0.0349 0.0305 0.0322
18:01-19:00, Wed., 12 Aug. 0.0365 0.0307 0.0334
17:01-18:00, Wed., 12 Aug. 0.0360 0.0303 0.0330
16:01-17:00, Wed., 12 Aug. 0.0354 0.0308 0.0329
15:01-16:00, Wed., 12 Aug. 0.0348 0.0306 0.0330
14:01-15:00, Wed., 12 Aug. 0.0356 0.0304 0.0328
13:01-14:00, Wed., 12 Aug. 0.0351 0.0305 0.0327
12:01-13:00, Wed., 12 Aug. 0.0370 0.0315 0.0337
11:01-12:00, Wed., 12 Aug. 0.0366 0.0306 0.0340
10:01-11:00, Wed., 12 Aug. 0.0351 0.0303 0.0323
09:01-10:00, Wed., 12 Aug. 0.0353 0.0304 0.0330
08:01-09:00, Wed., 12 Aug. 0.0374 0.0321 0.0348