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
04:01-05:00, Mon., 22 Jun. 0.0346 0.0308 0.0326
03:01-04:00, Mon., 22 Jun. 0.0346 0.0298 0.0322
02:01-03:00, Mon., 22 Jun. 0.0341 0.0301 0.0325
01:01-02:00, Mon., 22 Jun. 0.0347 0.0304 0.0323
00:01-01:00, Mon., 22 Jun. 0.0360 0.0312 0.0328
23:01-24:00, Sun., 21 Jun. 0.0357 0.0308 0.0333
22:01-23:00, Sun., 21 Jun. 0.0350 0.0304 0.0329
21:01-22:00, Sun., 21 Jun. 0.0347 0.0309 0.0326
20:01-21:00, Sun., 21 Jun. 0.0347 0.0309 0.0330
19:01-20:00, Sun., 21 Jun. 0.0359 0.0304 0.0328
18:01-19:00, Sun., 21 Jun. 0.0349 0.0305 0.0327
17:01-18:00, Sun., 21 Jun. 0.0347 0.0296 0.0322
16:01-17:00, Sun., 21 Jun. 0.0358 0.0300 0.0326
15:01-16:00, Sun., 21 Jun. 0.0347 0.0299 0.0323
14:01-15:00, Sun., 21 Jun. 0.0343 0.0305 0.0322
13:01-14:00, Sun., 21 Jun. 0.0356 0.0305 0.0326
12:01-13:00, Sun., 21 Jun. 0.0347 0.0305 0.0326
11:01-12:00, Sun., 21 Jun. 0.0353 0.0302 0.0323
10:01-11:00, Sun., 21 Jun. 0.0353 0.0303 0.0326
09:01-10:00, Sun., 21 Jun. 0.0353 0.0290 0.0323
08:01-09:00, Sun., 21 Jun. 0.0350 0.0301 0.0320
07:01-08:00, Sun., 21 Jun. 0.0362 0.0299 0.0323
06:01-07:00, Sun., 21 Jun. 0.0363 0.0307 0.0334
05:01-06:00, Sun., 21 Jun. 0.0401 0.0322 0.0367
04:01-05:00, Sun., 21 Jun. 0.0451 0.0377 0.0412
03:01-04:00, Sun., 21 Jun. 0.0429 0.0346 0.0381
02:01-03:00, Sun., 21 Jun. 0.0401 0.0349 0.0371
01:01-02:00, Sun., 21 Jun. 0.0396 0.0338 0.0366
00:01-01:00, Sun., 21 Jun. 0.0384 0.0329 0.0358
23:01-24:00, Sat., 20 Jun. 0.0399 0.0346 0.0369
22:01-23:00, Sat., 20 Jun. 0.0384 0.0334 0.0356
21:01-22:00, Sat., 20 Jun. 0.0375 0.0321 0.0351
20:01-21:00, Sat., 20 Jun. 0.0426 0.0349 0.0375
19:01-20:00, Sat., 20 Jun. 0.0397 0.0332 0.0366
18:01-19:00, Sat., 20 Jun. 0.0391 0.0336 0.0363
17:01-18:00, Sat., 20 Jun. 0.0381 0.0339 0.0359
16:01-17:00, Sat., 20 Jun. 0.0376 0.0313 0.0344
15:01-16:00, Sat., 20 Jun. 0.0362 0.0315 0.0341
14:01-15:00, Sat., 20 Jun. 0.0379 0.0323 0.0353
13:01-14:00, Sat., 20 Jun. 0.0401 0.0343 0.0371
12:01-13:00, Sat., 20 Jun. 0.0394 0.0322 0.0361
11:01-12:00, Sat., 20 Jun. 0.0352 0.0298 0.0326
10:01-11:00, Sat., 20 Jun. 0.0352 0.0301 0.0324
09:01-10:00, Sat., 20 Jun. 0.0352 0.0298 0.0325
08:01-09:00, Sat., 20 Jun. 0.0359 0.0321 0.0338
07:01-08:00, Sat., 20 Jun. 0.0370 0.0319 0.0341
06:01-07:00, Sat., 20 Jun. 0.0406 0.0339 0.0370
05:01-06:00, Sat., 20 Jun. 0.0424 0.0334 0.0382
04:01-05:00, Sat., 20 Jun. 0.0384 0.0307 0.0345
03:01-04:00, Sat., 20 Jun. 0.0360 0.0311 0.0336
02:01-03:00, Sat., 20 Jun. 0.0353 0.0300 0.0327
01:01-02:00, Sat., 20 Jun. 0.0344 0.0301 0.0326
00:01-01:00, Sat., 20 Jun. 0.0354 0.0295 0.0326
23:01-24:00, Fri., 19 Jun. 0.0352 0.0301 0.0326
22:01-23:00, Fri., 19 Jun. 0.0351 0.0302 0.0324
21:01-22:00, Fri., 19 Jun. 0.0346 0.0304 0.0325
20:01-21:00, Fri., 19 Jun. 0.0353 0.0299 0.0327
19:01-20:00, Fri., 19 Jun. 0.0349 0.0301 0.0327
18:01-19:00, Fri., 19 Jun. 0.0345 0.0297 0.0329
17:01-18:00, Fri., 19 Jun. 0.0347 0.0305 0.0327
16:01-17:00, Fri., 19 Jun. 0.0350 0.0309 0.0328
15:01-16:00, Fri., 19 Jun. 0.0348 0.0301 0.0325
14:01-15:00, Fri., 19 Jun. 0.0353 0.0305 0.0325
13:01-14:00, Fri., 19 Jun. 0.0338 0.0294 0.0321
12:01-13:00, Fri., 19 Jun. 0.0349 0.0292 0.0324
11:01-12:00, Fri., 19 Jun. 0.0345 0.0301 0.0325
10:01-11:00, Fri., 19 Jun. 0.0349 0.0301 0.0324
09:01-10:00, Fri., 19 Jun. 0.0356 0.0304 0.0326
08:01-09:00, Fri., 19 Jun. 0.0353 0.0306 0.0326
07:01-08:00, Fri., 19 Jun. 0.0363 0.0315 0.0336
06:01-07:00, Fri., 19 Jun. 0.0349 0.0305 0.0325
05:01-06:00, Fri., 19 Jun. 0.0343 0.0301 0.0325
04:01-05:00, Fri., 19 Jun. 0.0343 0.0294 0.0324
03:01-04:00, Fri., 19 Jun. 0.0358 0.0293 0.0323
02:01-03:00, Fri., 19 Jun. 0.0351 0.0303 0.0324
01:01-02:00, Fri., 19 Jun. 0.0342 0.0295 0.0322
00:01-01:00, Fri., 19 Jun. 0.0341 0.0302 0.0323
23:01-24:00, Thu., 18 Jun. 0.0352 0.0290 0.0324
22:01-23:00, Thu., 18 Jun. 0.0351 0.0297 0.0324
21:01-22:00, Thu., 18 Jun. 0.0342 0.0298 0.0323
20:01-21:00, Thu., 18 Jun. 0.0354 0.0295 0.0328
19:01-20:00, Thu., 18 Jun. 0.0346 0.0294 0.0323
18:01-19:00, Thu., 18 Jun. 0.0343 0.0301 0.0323
17:01-18:00, Thu., 18 Jun. 0.0346 0.0295 0.0321
16:01-17:00, Thu., 18 Jun. 0.0349 0.0297 0.0323
15:01-16:00, Thu., 18 Jun. 0.0346 0.0308 0.0324
14:01-15:00, Thu., 18 Jun. 0.0343 0.0302 0.0322
13:01-14:00, Thu., 18 Jun. 0.0347 0.0304 0.0324
12:01-13:00, Thu., 18 Jun. 0.0348 0.0304 0.0322
11:01-12:00, Thu., 18 Jun. 0.0350 0.0291 0.0323
10:01-11:00, Thu., 18 Jun. 0.0358 0.0308 0.0330
09:01-10:00, Thu., 18 Jun. 0.0357 0.0308 0.0339
08:01-09:00, Thu., 18 Jun. 0.0379 0.0313 0.0343
07:01-08:00, Thu., 18 Jun. 0.0399 0.0330 0.0355
06:01-07:00, Thu., 18 Jun. 0.0388 0.0330 0.0355
05:01-06:00, Thu., 18 Jun. 0.0383 0.0333 0.0355
04:01-05:00, Thu., 18 Jun. 0.0395 0.0336 0.0362
03:01-04:00, Thu., 18 Jun. 0.0391 0.0331 0.0362
02:01-03:00, Thu., 18 Jun. 0.0361 0.0306 0.0333
01:01-02:00, Thu., 18 Jun. 0.0360 0.0315 0.0333
00:01-01:00, Thu., 18 Jun. 0.0360 0.0301 0.0329
23:01-24:00, Wed., 17 Jun. 0.0359 0.0301 0.0328
22:01-23:00, Wed., 17 Jun. 0.0361 0.0304 0.0326
21:01-22:00, Wed., 17 Jun. 0.0350 0.0300 0.0325
20:01-21:00, Wed., 17 Jun. 0.0349 0.0307 0.0328
19:01-20:00, Wed., 17 Jun. 0.0349 0.0295 0.0328
18:01-19:00, Wed., 17 Jun. 0.0346 0.0309 0.0327
17:01-18:00, Wed., 17 Jun. 0.0349 0.0297 0.0325
16:01-17:00, Wed., 17 Jun. 0.0350 0.0297 0.0325
15:01-16:00, Wed., 17 Jun. 0.0349 0.0300 0.0327
14:01-15:00, Wed., 17 Jun. 0.0363 0.0303 0.0329
13:01-14:00, Wed., 17 Jun. 0.0354 0.0302 0.0326
12:01-13:00, Wed., 17 Jun. 0.0348 0.0304 0.0329
11:01-12:00, Wed., 17 Jun. 0.0353 0.0301 0.0326
10:01-11:00, Wed., 17 Jun. 0.0346 0.0300 0.0329
09:01-10:00, Wed., 17 Jun. 0.0360 0.0298 0.0329
08:01-09:00, Wed., 17 Jun. 0.0354 0.0302 0.0329
07:01-08:00, Wed., 17 Jun. 0.0354 0.0313 0.0336
06:01-07:00, Wed., 17 Jun. 0.0367 0.0309 0.0341
05:01-06:00, Wed., 17 Jun. 0.0372 0.0322 0.0342
04:01-05:00, Wed., 17 Jun. 0.0367 0.0318 0.0344
03:01-04:00, Wed., 17 Jun. 0.0353 0.0311 0.0333
02:01-03:00, Wed., 17 Jun. 0.0356 0.0311 0.0333
01:01-02:00, Wed., 17 Jun. 0.0356 0.0298 0.0331
00:01-01:00, Wed., 17 Jun. 0.0351 0.0305 0.0329
23:01-24:00, Tue., 16 Jun. 0.0349 0.0311 0.0328
22:01-23:00, Tue., 16 Jun. 0.0350 0.0300 0.0325
21:01-22:00, Tue., 16 Jun. 0.0342 0.0300 0.0325
20:01-21:00, Tue., 16 Jun. 0.0350 0.0301 0.0325
19:01-20:00, Tue., 16 Jun. 0.0350 0.0307 0.0328
18:01-19:00, Tue., 16 Jun. 0.0359 0.0304 0.0327
17:01-18:00, Tue., 16 Jun. 0.0348 0.0302 0.0326
16:01-17:00, Tue., 16 Jun. 0.0351 0.0305 0.0328
15:01-16:00, Tue., 16 Jun. 0.0346 0.0300 0.0327
14:01-15:00, Tue., 16 Jun. 0.0353 0.0310 0.0329
13:01-14:00, Tue., 16 Jun. 0.0349 0.0301 0.0329
12:01-13:00, Tue., 16 Jun. 0.0352 0.0309 0.0328
11:01-12:00, Tue., 16 Jun. 0.0358 0.0305 0.0329
10:01-11:00, Tue., 16 Jun. 0.0363 0.0308 0.0331
09:01-10:00, Tue., 16 Jun. 0.0357 0.0309 0.0333
08:01-09:00, Tue., 16 Jun. 0.0356 0.0313 0.0333
07:01-08:00, Tue., 16 Jun. 0.0361 0.0312 0.0332
06:01-07:00, Tue., 16 Jun. 0.0355 0.0307 0.0329
05:01-06:00, Tue., 16 Jun. 0.0347 0.0301 0.0328
04:01-05:00, Tue., 16 Jun. 0.0353 0.0301 0.0325
03:01-04:00, Tue., 16 Jun. 0.0363 0.0297 0.0324
02:01-03:00, Tue., 16 Jun. 0.0354 0.0299 0.0325
01:01-02:00, Tue., 16 Jun. 0.0347 0.0299 0.0324
00:01-01:00, Tue., 16 Jun. 0.0354 0.0304 0.0327
23:01-24:00, Mon., 15 Jun. 0.0360 0.0309 0.0330
22:01-23:00, Mon., 15 Jun. 0.0360 0.0310 0.0326
21:01-22:00, Mon., 15 Jun. 0.0345 0.0300 0.0326
20:01-21:00, Mon., 15 Jun. 0.0349 0.0304 0.0325
19:01-20:00, Mon., 15 Jun. 0.0349 0.0297 0.0324
18:01-19:00, Mon., 15 Jun. 0.0348 0.0297 0.0323
17:01-18:00, Mon., 15 Jun. 0.0350 0.0305 0.0324
16:01-17:00, Mon., 15 Jun. 0.0349 0.0301 0.0324
15:01-16:00, Mon., 15 Jun. 0.0348 0.0306 0.0324
14:01-15:00, Mon., 15 Jun. 0.0347 0.0303 0.0325
13:01-14:00, Mon., 15 Jun. 0.0356 0.0306 0.0328
12:01-13:00, Mon., 15 Jun. 0.0355 0.0303 0.0327
11:01-12:00, Mon., 15 Jun. 0.0362 0.0308 0.0327
10:01-11:00, Mon., 15 Jun. 0.0356 0.0296 0.0331
09:01-10:00, Mon., 15 Jun. 0.0381 0.0324 0.0346
08:01-09:00, Mon., 15 Jun. 0.0360 0.0309 0.0331
07:01-08:00, Mon., 15 Jun. 0.0370 0.0318 0.0344
06:01-07:00, Mon., 15 Jun. 0.0391 0.0329 0.0358
05:01-06:00, Mon., 15 Jun. 0.0386 0.0335 0.0365
04:01-05:00, Mon., 15 Jun. 0.0399 0.0342 0.0368
03:01-04:00, Mon., 15 Jun. 0.0395 0.0332 0.0365
02:01-03:00, Mon., 15 Jun. 0.0375 0.0318 0.0346
01:01-02:00, Mon., 15 Jun. 0.0365 0.0320 0.0344
00:01-01:00, Mon., 15 Jun. 0.0372 0.0330 0.0351
23:01-24:00, Sun., 14 Jun. 0.0366 0.0315 0.0335
22:01-23:00, Sun., 14 Jun. 0.0354 0.0312 0.0329
21:01-22:00, Sun., 14 Jun. 0.0352 0.0308 0.0327
20:01-21:00, Sun., 14 Jun. 0.0348 0.0306 0.0329
19:01-20:00, Sun., 14 Jun. 0.0349 0.0305 0.0326
18:01-19:00, Sun., 14 Jun. 0.0351 0.0297 0.0328
17:01-18:00, Sun., 14 Jun. 0.0346 0.0297 0.0327
16:01-17:00, Sun., 14 Jun. 0.0358 0.0309 0.0329
15:01-16:00, Sun., 14 Jun. 0.0349 0.0297 0.0327
14:01-15:00, Sun., 14 Jun. 0.0347 0.0311 0.0330
13:01-14:00, Sun., 14 Jun. 0.0358 0.0300 0.0328
12:01-13:00, Sun., 14 Jun. 0.0348 0.0311 0.0330
11:01-12:00, Sun., 14 Jun. 0.0353 0.0310 0.0333
10:01-11:00, Sun., 14 Jun. 0.0363 0.0307 0.0332
09:01-10:00, Sun., 14 Jun. 0.0360 0.0315 0.0338
08:01-09:00, Sun., 14 Jun. 0.0363 0.0318 0.0338
07:01-08:00, Sun., 14 Jun. 0.0370 0.0318 0.0339
06:01-07:00, Sun., 14 Jun. 0.0367 0.0322 0.0345
05:01-06:00, Sun., 14 Jun. 0.0363 0.0319 0.0340
04:01-05:00, Sun., 14 Jun. 0.0366 0.0325 0.0340
03:01-04:00, Sun., 14 Jun. 0.0369 0.0326 0.0345
02:01-03:00, Sun., 14 Jun. 0.0374 0.0326 0.0346
01:01-02:00, Sun., 14 Jun. 0.0361 0.0318 0.0341
00:01-01:00, Sun., 14 Jun. 0.0366 0.0320 0.0341
23:01-24:00, Sat., 13 Jun. 0.0356 0.0318 0.0338
22:01-23:00, Sat., 13 Jun. 0.0355 0.0301 0.0338
21:01-22:00, Sat., 13 Jun. 0.0352 0.0313 0.0333
20:01-21:00, Sat., 13 Jun. 0.0356 0.0304 0.0334
19:01-20:00, Sat., 13 Jun. 0.0370 0.0311 0.0331
18:01-19:00, Sat., 13 Jun. 0.0353 0.0308 0.0331
17:01-18:00, Sat., 13 Jun. 0.0354 0.0311 0.0334
16:01-17:00, Sat., 13 Jun. 0.0349 0.0307 0.0328
15:01-16:00, Sat., 13 Jun. 0.0351 0.0301 0.0331
14:01-15:00, Sat., 13 Jun. 0.0368 0.0303 0.0333
13:01-14:00, Sat., 13 Jun. 0.0358 0.0311 0.0331
12:01-13:00, Sat., 13 Jun. 0.0352 0.0308 0.0334
11:01-12:00, Sat., 13 Jun. 0.0354 0.0303 0.0331
10:01-11:00, Sat., 13 Jun. 0.0357 0.0305 0.0333
09:01-10:00, Sat., 13 Jun. 0.0348 0.0309 0.0331
08:01-09:00, Sat., 13 Jun. 0.0364 0.0315 0.0334
07:01-08:00, Sat., 13 Jun. 0.0361 0.0312 0.0332
06:01-07:00, Sat., 13 Jun. 0.0363 0.0308 0.0334
05:01-06:00, Sat., 13 Jun. 0.0355 0.0304 0.0334
04:01-05:00, Sat., 13 Jun. 0.0370 0.0308 0.0333
03:01-04:00, Sat., 13 Jun. 0.0352 0.0316 0.0332
02:01-03:00, Sat., 13 Jun. 0.0367 0.0308 0.0332
01:01-02:00, Sat., 13 Jun. 0.0357 0.0311 0.0339
00:01-01:00, Sat., 13 Jun. 0.0360 0.0311 0.0338
23:01-24:00, Fri., 12 Jun. 0.0356 0.0310 0.0336
22:01-23:00, Fri., 12 Jun. 0.0366 0.0315 0.0336
21:01-22:00, Fri., 12 Jun. 0.0350 0.0309 0.0333
20:01-21:00, Fri., 12 Jun. 0.0354 0.0315 0.0330
19:01-20:00, Fri., 12 Jun. 0.0354 0.0308 0.0330
18:01-19:00, Fri., 12 Jun. 0.0363 0.0318 0.0337
17:01-18:00, Fri., 12 Jun. 0.0374 0.0313 0.0339
16:01-17:00, Fri., 12 Jun. 0.0356 0.0311 0.0335
15:01-16:00, Fri., 12 Jun. 0.0370 0.0317 0.0342
14:01-15:00, Fri., 12 Jun. 0.0403 0.0331 0.0364
13:01-14:00, Fri., 12 Jun. 0.0399 0.0310 0.0349
12:01-13:00, Fri., 12 Jun. 0.0355 0.0307 0.0332
11:01-12:00, Fri., 12 Jun. 0.0351 0.0309 0.0332
10:01-11:00, Fri., 12 Jun. 0.0359 0.0307 0.0331
09:01-10:00, Fri., 12 Jun. 0.0360 0.0299 0.0332
08:01-09:00, Fri., 12 Jun. 0.0354 0.0315 0.0334
07:01-08:00, Fri., 12 Jun. 0.0359 0.0321 0.0340
06:01-07:00, Fri., 12 Jun. 0.0365 0.0317 0.0339
05:01-06:00, Fri., 12 Jun. 0.0361 0.0309 0.0334