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
12:01-13:00, Sat., 20 Apr. 0.0381 0.0313 0.0350
11:01-12:00, Sat., 20 Apr. 0.0374 0.0325 0.0349
10:01-11:00, Sat., 20 Apr. 0.0367 0.0332 0.0349
09:01-10:00, Sat., 20 Apr. 0.0370 0.0326 0.0348
08:01-09:00, Sat., 20 Apr. 0.0367 0.0325 0.0349
07:01-08:00, Sat., 20 Apr. 0.0367 0.0323 0.0347
06:01-07:00, Sat., 20 Apr. 0.0374 0.0329 0.0349
05:01-06:00, Sat., 20 Apr. 0.0379 0.0322 0.0347
04:01-05:00, Sat., 20 Apr. 0.0363 0.0323 0.0345
03:01-04:00, Sat., 20 Apr. 0.0374 0.0325 0.0347
02:01-03:00, Sat., 20 Apr. 0.0372 0.0323 0.0349
01:01-02:00, Sat., 20 Apr. 0.0366 0.0325 0.0344
00:01-01:00, Sat., 20 Apr. 0.0362 0.0325 0.0342
23:01-24:00, Fri., 19 Apr. 0.0370 0.0319 0.0345
22:01-23:00, Fri., 19 Apr. 0.0367 0.0321 0.0345
21:01-22:00, Fri., 19 Apr. 0.0363 0.0318 0.0343
20:01-21:00, Fri., 19 Apr. 0.0370 0.0315 0.0341
19:01-20:00, Fri., 19 Apr. 0.0363 0.0324 0.0345
18:01-19:00, Fri., 19 Apr. 0.0366 0.0318 0.0345
17:01-18:00, Fri., 19 Apr. 0.0376 0.0325 0.0347
16:01-17:00, Fri., 19 Apr. 0.0386 0.0323 0.0347
15:01-16:00, Fri., 19 Apr. 0.0376 0.0328 0.0351
14:01-15:00, Fri., 19 Apr. 0.0374 0.0325 0.0349
13:01-14:00, Fri., 19 Apr. 0.0376 0.0334 0.0349
12:01-13:00, Fri., 19 Apr. 0.0377 0.0328 0.0348
11:01-12:00, Fri., 19 Apr. 0.0371 0.0322 0.0348
10:01-11:00, Fri., 19 Apr. 0.0375 0.0325 0.0345
09:01-10:00, Fri., 19 Apr. 0.0359 0.0318 0.0342
08:01-09:00, Fri., 19 Apr. 0.0370 0.0314 0.0342
07:01-08:00, Fri., 19 Apr. 0.0370 0.0320 0.0342
06:01-07:00, Fri., 19 Apr. 0.0362 0.0325 0.0344
05:01-06:00, Fri., 19 Apr. 0.0376 0.0324 0.0345
04:01-05:00, Fri., 19 Apr. 0.0367 0.0321 0.0343
03:01-04:00, Fri., 19 Apr. 0.0370 0.0313 0.0344
02:01-03:00, Fri., 19 Apr. 0.0381 0.0322 0.0351
01:01-02:00, Fri., 19 Apr. 0.0404 0.0347 0.0371
00:01-01:00, Fri., 19 Apr. 0.0481 0.0369 0.0425
23:01-24:00, Thu., 18 Apr. 0.0533 0.0451 0.0493
22:01-23:00, Thu., 18 Apr. 0.0480 0.0392 0.0431
21:01-22:00, Thu., 18 Apr. 0.0414 0.0324 0.0368
20:01-21:00, Thu., 18 Apr. 0.0384 0.0330 0.0357
19:01-20:00, Thu., 18 Apr. 0.0377 0.0324 0.0355
18:01-19:00, Thu., 18 Apr. 0.0386 0.0329 0.0352
17:01-18:00, Thu., 18 Apr. 0.0376 0.0321 0.0346
16:01-17:00, Thu., 18 Apr. 0.0367 0.0308 0.0346
15:01-16:00, Thu., 18 Apr. 0.0366 0.0316 0.0346
14:01-15:00, Thu., 18 Apr. 0.0374 0.0325 0.0349
13:01-14:00, Thu., 18 Apr. 0.0390 0.0326 0.0348
12:01-13:00, Thu., 18 Apr. 0.0370 0.0325 0.0349
11:01-12:00, Thu., 18 Apr. 0.0377 0.0332 0.0350
10:01-11:00, Thu., 18 Apr. 0.0377 0.0326 0.0349
09:01-10:00, Thu., 18 Apr. 0.0370 0.0329 0.0348
08:01-09:00, Thu., 18 Apr. 0.0367 0.0331 0.0350
07:01-08:00, Thu., 18 Apr. 0.0379 0.0325 0.0348
06:01-07:00, Thu., 18 Apr. 0.0370 0.0324 0.0344
05:01-06:00, Thu., 18 Apr. 0.0363 0.0321 0.0343
04:01-05:00, Thu., 18 Apr. 0.0367 0.0315 0.0342
03:01-04:00, Thu., 18 Apr. 0.0370 0.0325 0.0344
02:01-03:00, Thu., 18 Apr. 0.0370 0.0320 0.0342
01:01-02:00, Thu., 18 Apr. 0.0368 0.0325 0.0343
00:01-01:00, Thu., 18 Apr. 0.0360 0.0317 0.0339
23:01-24:00, Wed., 17 Apr. 0.0366 0.0311 0.0339
22:01-23:00, Wed., 17 Apr. 0.0358 0.0315 0.0338
21:01-22:00, Wed., 17 Apr. 0.0367 0.0318 0.0339
20:01-21:00, Wed., 17 Apr. 0.0356 0.0314 0.0338
19:01-20:00, Wed., 17 Apr. 0.0366 0.0302 0.0339
18:01-19:00, Wed., 17 Apr. 0.0367 0.0311 0.0338
17:01-18:00, Wed., 17 Apr. 0.0368 0.0325 0.0344
16:01-17:00, Wed., 17 Apr. 0.0367 0.0311 0.0342
15:01-16:00, Wed., 17 Apr. 0.0368 0.0315 0.0342
14:01-15:00, Wed., 17 Apr. 0.0366 0.0312 0.0343
13:01-14:00, Wed., 17 Apr. 0.0370 0.0317 0.0344
12:01-13:00, Wed., 17 Apr. 0.0363 0.0316 0.0344
11:01-12:00, Wed., 17 Apr. 0.0370 0.0308 0.0343
10:01-11:00, Wed., 17 Apr. 0.0374 0.0318 0.0342
09:01-10:00, Wed., 17 Apr. 0.0363 0.0317 0.0339
08:01-09:00, Wed., 17 Apr. 0.0363 0.0315 0.0338
07:01-08:00, Wed., 17 Apr. 0.0353 0.0317 0.0337
06:01-07:00, Wed., 17 Apr. 0.0354 0.0313 0.0337
05:01-06:00, Wed., 17 Apr. 0.0365 0.0311 0.0335
04:01-05:00, Wed., 17 Apr. 0.0358 0.0311 0.0335
03:01-04:00, Wed., 17 Apr. 0.0367 0.0313 0.0338
02:01-03:00, Wed., 17 Apr. 0.0366 0.0325 0.0343
01:01-02:00, Wed., 17 Apr. 0.0360 0.0308 0.0334
00:01-01:00, Wed., 17 Apr. 0.0354 0.0318 0.0335
23:01-24:00, Tue., 16 Apr. 0.0365 0.0306 0.0333
22:01-23:00, Tue., 16 Apr. 0.0356 0.0311 0.0334
21:01-22:00, Tue., 16 Apr. 0.0361 0.0311 0.0334
20:01-21:00, Tue., 16 Apr. 0.0355 0.0308 0.0334
19:01-20:00, Tue., 16 Apr. 0.0358 0.0316 0.0335
18:01-19:00, Tue., 16 Apr. 0.0362 0.0315 0.0337
17:01-18:00, Tue., 16 Apr. 0.0356 0.0315 0.0334
16:01-17:00, Tue., 16 Apr. 0.0353 0.0312 0.0337
15:01-16:00, Tue., 16 Apr. 0.0363 0.0316 0.0339
14:01-15:00, Tue., 16 Apr. 0.0360 0.0313 0.0338
13:01-14:00, Tue., 16 Apr. 0.0368 0.0311 0.0337
12:01-13:00, Tue., 16 Apr. 0.0360 0.0318 0.0335
11:01-12:00, Tue., 16 Apr. 0.0367 0.0311 0.0335
10:01-11:00, Tue., 16 Apr. 0.0366 0.0311 0.0338
09:01-10:00, Tue., 16 Apr. 0.0357 0.0315 0.0337
08:01-09:00, Tue., 16 Apr. 0.0375 0.0318 0.0345
07:01-08:00, Tue., 16 Apr. 0.0363 0.0328 0.0346
06:01-07:00, Tue., 16 Apr. 0.0363 0.0313 0.0340
05:01-06:00, Tue., 16 Apr. 0.0357 0.0303 0.0335
04:01-05:00, Tue., 16 Apr. 0.0360 0.0311 0.0334
03:01-04:00, Tue., 16 Apr. 0.0363 0.0311 0.0334
02:01-03:00, Tue., 16 Apr. 0.0358 0.0314 0.0334
01:01-02:00, Tue., 16 Apr. 0.0360 0.0301 0.0333
00:01-01:00, Tue., 16 Apr. 0.0353 0.0311 0.0333
23:01-24:00, Mon., 15 Apr. 0.0363 0.0305 0.0332
22:01-23:00, Mon., 15 Apr. 0.0353 0.0311 0.0332
21:01-22:00, Mon., 15 Apr. 0.0356 0.0307 0.0334
20:01-21:00, Mon., 15 Apr. 0.0358 0.0315 0.0333
19:01-20:00, Mon., 15 Apr. 0.0358 0.0305 0.0331
18:01-19:00, Mon., 15 Apr. 0.0369 0.0311 0.0333
17:01-18:00, Mon., 15 Apr. 0.0360 0.0306 0.0336
16:01-17:00, Mon., 15 Apr. 0.0355 0.0315 0.0334
15:01-16:00, Mon., 15 Apr. 0.0368 0.0318 0.0340
14:01-15:00, Mon., 15 Apr. 0.0362 0.0313 0.0338
13:01-14:00, Mon., 15 Apr. 0.0358 0.0304 0.0338
12:01-13:00, Mon., 15 Apr. 0.0356 0.0315 0.0336
11:01-12:00, Mon., 15 Apr. 0.0360 0.0305 0.0340
10:01-11:00, Mon., 15 Apr. 0.0360 0.0318 0.0337
09:01-10:00, Mon., 15 Apr. 0.0358 0.0314 0.0339
08:01-09:00, Mon., 15 Apr. 0.0369 0.0323 0.0343
07:01-08:00, Mon., 15 Apr. 0.0367 0.0311 0.0340
06:01-07:00, Mon., 15 Apr. 0.0373 0.0318 0.0343
05:01-06:00, Mon., 15 Apr. 0.0367 0.0318 0.0343
04:01-05:00, Mon., 15 Apr. 0.0363 0.0316 0.0343
03:01-04:00, Mon., 15 Apr. 0.0368 0.0320 0.0343
02:01-03:00, Mon., 15 Apr. 0.0359 0.0315 0.0334
01:01-02:00, Mon., 15 Apr. 0.0350 0.0301 0.0330
00:01-01:00, Mon., 15 Apr. 0.0356 0.0313 0.0335
23:01-24:00, Sun., 14 Apr. 0.0360 0.0304 0.0332
22:01-23:00, Sun., 14 Apr. 0.0360 0.0307 0.0329
21:01-22:00, Sun., 14 Apr. 0.0354 0.0308 0.0330
20:01-21:00, Sun., 14 Apr. 0.0354 0.0304 0.0330
19:01-20:00, Sun., 14 Apr. 0.0354 0.0304 0.0330
18:01-19:00, Sun., 14 Apr. 0.0352 0.0307 0.0332
17:01-18:00, Sun., 14 Apr. 0.0352 0.0308 0.0333
16:01-17:00, Sun., 14 Apr. 0.0360 0.0309 0.0334
15:01-16:00, Sun., 14 Apr. 0.0368 0.0318 0.0337
14:01-15:00, Sun., 14 Apr. 0.0363 0.0311 0.0339
13:01-14:00, Sun., 14 Apr. 0.0365 0.0318 0.0341
12:01-13:00, Sun., 14 Apr. 0.0369 0.0318 0.0339
11:01-12:00, Sun., 14 Apr. 0.0357 0.0309 0.0336
10:01-11:00, Sun., 14 Apr. 0.0354 0.0302 0.0334
09:01-10:00, Sun., 14 Apr. 0.0360 0.0313 0.0337
08:01-09:00, Sun., 14 Apr. 0.0357 0.0315 0.0340
07:01-08:00, Sun., 14 Apr. 0.0366 0.0319 0.0338
06:01-07:00, Sun., 14 Apr. 0.0363 0.0318 0.0338
05:01-06:00, Sun., 14 Apr. 0.0367 0.0319 0.0339
04:01-05:00, Sun., 14 Apr. 0.0367 0.0309 0.0339
03:01-04:00, Sun., 14 Apr. 0.0364 0.0320 0.0339
02:01-03:00, Sun., 14 Apr. 0.0370 0.0314 0.0337
01:01-02:00, Sun., 14 Apr. 0.0349 0.0306 0.0333
00:01-01:00, Sun., 14 Apr. 0.0353 0.0309 0.0331
23:01-24:00, Sat., 13 Apr. 0.0363 0.0311 0.0329
22:01-23:00, Sat., 13 Apr. 0.0359 0.0311 0.0331
21:01-22:00, Sat., 13 Apr. 0.0352 0.0308 0.0331
20:01-21:00, Sat., 13 Apr. 0.0351 0.0303 0.0326
19:01-20:00, Sat., 13 Apr. 0.0353 0.0308 0.0332
18:01-19:00, Sat., 13 Apr. 0.0352 0.0308 0.0332
17:01-18:00, Sat., 13 Apr. 0.0351 0.0307 0.0330
16:01-17:00, Sat., 13 Apr. 0.0362 0.0302 0.0332
15:01-16:00, Sat., 13 Apr. 0.0367 0.0311 0.0336
14:01-15:00, Sat., 13 Apr. 0.0357 0.0316 0.0336
13:01-14:00, Sat., 13 Apr. 0.0361 0.0308 0.0332
12:01-13:00, Sat., 13 Apr. 0.0362 0.0318 0.0335
11:01-12:00, Sat., 13 Apr. 0.0373 0.0315 0.0337
10:01-11:00, Sat., 13 Apr. 0.0358 0.0310 0.0333
09:01-10:00, Sat., 13 Apr. 0.0361 0.0315 0.0334
08:01-09:00, Sat., 13 Apr. 0.0355 0.0308 0.0334
07:01-08:00, Sat., 13 Apr. 0.0370 0.0309 0.0340
06:01-07:00, Sat., 13 Apr. 0.0361 0.0322 0.0342
05:01-06:00, Sat., 13 Apr. 0.0367 0.0317 0.0339
04:01-05:00, Sat., 13 Apr. 0.0360 0.0315 0.0335
03:01-04:00, Sat., 13 Apr. 0.0357 0.0323 0.0338
02:01-03:00, Sat., 13 Apr. 0.0363 0.0310 0.0334
01:01-02:00, Sat., 13 Apr. 0.0367 0.0317 0.0335
00:01-01:00, Sat., 13 Apr. 0.0360 0.0311 0.0335
23:01-24:00, Fri., 12 Apr. 0.0349 0.0310 0.0330
22:01-23:00, Fri., 12 Apr. 0.0353 0.0306 0.0329
21:01-22:00, Fri., 12 Apr. 0.0350 0.0304 0.0328
20:01-21:00, Fri., 12 Apr. 0.0349 0.0299 0.0326
19:01-20:00, Fri., 12 Apr. 0.0353 0.0309 0.0329
18:01-19:00, Fri., 12 Apr. 0.0360 0.0309 0.0332
17:01-18:00, Fri., 12 Apr. 0.0356 0.0307 0.0333
16:01-17:00, Fri., 12 Apr. 0.0348 0.0304 0.0329
15:01-16:00, Fri., 12 Apr. 0.0367 0.0304 0.0331
14:01-15:00, Fri., 12 Apr. 0.0356 0.0314 0.0335
13:01-14:00, Fri., 12 Apr. 0.0356 0.0314 0.0335
12:01-13:00, Fri., 12 Apr. 0.0367 0.0322 0.0344
11:01-12:00, Fri., 12 Apr. 0.0367 0.0319 0.0346
10:01-11:00, Fri., 12 Apr. 0.0367 0.0310 0.0332
09:01-10:00, Fri., 12 Apr. 0.0357 0.0301 0.0331
08:01-09:00, Fri., 12 Apr. 0.0350 0.0311 0.0331
07:01-08:00, Fri., 12 Apr. 0.0356 0.0308 0.0333
06:01-07:00, Fri., 12 Apr. 0.0362 0.0311 0.0334
05:01-06:00, Fri., 12 Apr. 0.0354 0.0321 0.0338
04:01-05:00, Fri., 12 Apr. 0.0363 0.0311 0.0335
03:01-04:00, Fri., 12 Apr. 0.0352 0.0310 0.0332
02:01-03:00, Fri., 12 Apr. 0.0355 0.0299 0.0332
01:01-02:00, Fri., 12 Apr. 0.0355 0.0304 0.0332
00:01-01:00, Fri., 12 Apr. 0.0353 0.0302 0.0329
23:01-24:00, Thu., 11 Apr. 0.0356 0.0304 0.0324
22:01-23:00, Thu., 11 Apr. 0.0341 0.0302 0.0324
21:01-22:00, Thu., 11 Apr. 0.0347 0.0298 0.0327
20:01-21:00, Thu., 11 Apr. 0.0349 0.0306 0.0328
19:01-20:00, Thu., 11 Apr. 0.0363 0.0306 0.0330
18:01-19:00, Thu., 11 Apr. 0.0348 0.0314 0.0329
17:01-18:00, Thu., 11 Apr. 0.0350 0.0301 0.0328
16:01-17:00, Thu., 11 Apr. 0.0354 0.0305 0.0328
15:01-16:00, Thu., 11 Apr. 0.0356 0.0307 0.0327
14:01-15:00, Thu., 11 Apr. 0.0353 0.0304 0.0331
13:01-14:00, Thu., 11 Apr. 0.0351 0.0309 0.0329
12:01-13:00, Thu., 11 Apr. 0.0359 0.0306 0.0331
11:01-12:00, Thu., 11 Apr. 0.0355 0.0307 0.0330
10:01-11:00, Thu., 11 Apr. 0.0354 0.0303 0.0328
09:01-10:00, Thu., 11 Apr. 0.0352 0.0299 0.0333
08:01-09:00, Thu., 11 Apr. 0.0361 0.0316 0.0334
07:01-08:00, Thu., 11 Apr. 0.0371 0.0317 0.0339
06:01-07:00, Thu., 11 Apr. 0.0362 0.0316 0.0340
05:01-06:00, Thu., 11 Apr. 0.0370 0.0321 0.0340
04:01-05:00, Thu., 11 Apr. 0.0363 0.0318 0.0339
03:01-04:00, Thu., 11 Apr. 0.0364 0.0318 0.0337
02:01-03:00, Thu., 11 Apr. 0.0366 0.0315 0.0335
01:01-02:00, Thu., 11 Apr. 0.0352 0.0314 0.0335
00:01-01:00, Thu., 11 Apr. 0.0354 0.0308 0.0328
23:01-24:00, Wed., 10 Apr. 0.0350 0.0307 0.0328
22:01-23:00, Wed., 10 Apr. 0.0341 0.0299 0.0323
21:01-22:00, Wed., 10 Apr. 0.0353 0.0307 0.0325
20:01-21:00, Wed., 10 Apr. 0.0347 0.0297 0.0325
19:01-20:00, Wed., 10 Apr. 0.0351 0.0297 0.0325
18:01-19:00, Wed., 10 Apr. 0.0348 0.0294 0.0325
17:01-18:00, Wed., 10 Apr. 0.0351 0.0303 0.0323
16:01-17:00, Wed., 10 Apr. 0.0358 0.0306 0.0330
15:01-16:00, Wed., 10 Apr. 0.0368 0.0305 0.0328
14:01-15:00, Wed., 10 Apr. 0.0351 0.0310 0.0328
13:01-14:00, Wed., 10 Apr. 0.0353 0.0294 0.0328