Radiation doses in the air / Measurement results by the hour (Adachi)

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.

News about this monitoring post

Due to a power outage at our center due to statutory inspection of electrical equipment, we will temporarily suspend updating of monitoring post measurement values ​​from 8:00 to 19:00 on Saturday, October 18, 2025.

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
05:01-06:00, Mon., 15 Sep. 0.0326 0.0278 0.0297
04:01-05:00, Mon., 15 Sep. 0.0320 0.0270 0.0299
03:01-04:00, Mon., 15 Sep. 0.0314 0.0278 0.0295
02:01-03:00, Mon., 15 Sep. 0.0319 0.0277 0.0299
01:01-02:00, Mon., 15 Sep. 0.0325 0.0275 0.0300
00:01-01:00, Mon., 15 Sep. 0.0323 0.0276 0.0301
23:01-24:00, Sun., 14 Sep. 0.0329 0.0275 0.0304
22:01-23:00, Sun., 14 Sep. 0.0325 0.0283 0.0304
21:01-22:00, Sun., 14 Sep. 0.0325 0.0283 0.0305
20:01-21:00, Sun., 14 Sep. 0.0333 0.0287 0.0305
19:01-20:00, Sun., 14 Sep. 0.0339 0.0287 0.0307
18:01-19:00, Sun., 14 Sep. 0.0325 0.0281 0.0306
17:01-18:00, Sun., 14 Sep. 0.0329 0.0289 0.0307
16:01-17:00, Sun., 14 Sep. 0.0324 0.0282 0.0304
15:01-16:00, Sun., 14 Sep. 0.0326 0.0282 0.0301
14:01-15:00, Sun., 14 Sep. 0.0322 0.0279 0.0302
13:01-14:00, Sun., 14 Sep. 0.0327 0.0272 0.0304
12:01-13:00, Sun., 14 Sep. 0.0322 0.0275 0.0303
11:01-12:00, Sun., 14 Sep. 0.0325 0.0285 0.0305
10:01-11:00, Sun., 14 Sep. 0.0332 0.0279 0.0309
09:01-10:00, Sun., 14 Sep. 0.0338 0.0296 0.0311
08:01-09:00, Sun., 14 Sep. 0.0332 0.0288 0.0310
07:01-08:00, Sun., 14 Sep. 0.0330 0.0273 0.0309
06:01-07:00, Sun., 14 Sep. 0.0327 0.0287 0.0304
05:01-06:00, Sun., 14 Sep. 0.0331 0.0281 0.0301
04:01-05:00, Sun., 14 Sep. 0.0321 0.0271 0.0295
03:01-04:00, Sun., 14 Sep. 0.0318 0.0273 0.0295
02:01-03:00, Sun., 14 Sep. 0.0313 0.0276 0.0294
01:01-02:00, Sun., 14 Sep. 0.0323 0.0266 0.0295
00:01-01:00, Sun., 14 Sep. 0.0321 0.0273 0.0297
23:01-24:00, Sat., 13 Sep. 0.0313 0.0275 0.0293
22:01-23:00, Sat., 13 Sep. 0.0322 0.0277 0.0296
21:01-22:00, Sat., 13 Sep. 0.0319 0.0266 0.0293
20:01-21:00, Sat., 13 Sep. 0.0320 0.0276 0.0299
19:01-20:00, Sat., 13 Sep. 0.0329 0.0277 0.0298
18:01-19:00, Sat., 13 Sep. 0.0318 0.0273 0.0295
17:01-18:00, Sat., 13 Sep. 0.0311 0.0269 0.0292
16:01-17:00, Sat., 13 Sep. 0.0312 0.0267 0.0292
15:01-16:00, Sat., 13 Sep. 0.0318 0.0275 0.0293
14:01-15:00, Sat., 13 Sep. 0.0312 0.0266 0.0289
13:01-14:00, Sat., 13 Sep. 0.0315 0.0264 0.0295
12:01-13:00, Sat., 13 Sep. 0.0311 0.0266 0.0290
11:01-12:00, Sat., 13 Sep. 0.0308 0.0270 0.0288
10:01-11:00, Sat., 13 Sep. 0.0308 0.0270 0.0290
09:01-10:00, Sat., 13 Sep. 0.0308 0.0269 0.0288
08:01-09:00, Sat., 13 Sep. 0.0318 0.0266 0.0286
07:01-08:00, Sat., 13 Sep. 0.0308 0.0267 0.0287
06:01-07:00, Sat., 13 Sep. 0.0307 0.0264 0.0286
05:01-06:00, Sat., 13 Sep. 0.0311 0.0273 0.0290
04:01-05:00, Sat., 13 Sep. 0.0334 0.0276 0.0303
03:01-04:00, Sat., 13 Sep. 0.0360 0.0308 0.0334
02:01-03:00, Sat., 13 Sep. 0.0369 0.0297 0.0329
01:01-02:00, Sat., 13 Sep. 0.0353 0.0299 0.0328
00:01-01:00, Sat., 13 Sep. 0.0338 0.0276 0.0303
23:01-24:00, Fri., 12 Sep. 0.0322 0.0265 0.0298
22:01-23:00, Fri., 12 Sep. 0.0336 0.0290 0.0313
21:01-22:00, Fri., 12 Sep. 0.0332 0.0275 0.0307
20:01-21:00, Fri., 12 Sep. 0.0310 0.0266 0.0291
19:01-20:00, Fri., 12 Sep. 0.0315 0.0270 0.0294
18:01-19:00, Fri., 12 Sep. 0.0325 0.0273 0.0299
17:01-18:00, Fri., 12 Sep. 0.0334 0.0278 0.0310
16:01-17:00, Fri., 12 Sep. 0.0318 0.0273 0.0293
15:01-16:00, Fri., 12 Sep. 0.0318 0.0276 0.0297
14:01-15:00, Fri., 12 Sep. 0.0333 0.0287 0.0306
13:01-14:00, Fri., 12 Sep. 0.0349 0.0291 0.0323
12:01-13:00, Fri., 12 Sep. 0.0363 0.0281 0.0324
11:01-12:00, Fri., 12 Sep. 0.0314 0.0270 0.0293
10:01-11:00, Fri., 12 Sep. 0.0312 0.0272 0.0293
09:01-10:00, Fri., 12 Sep. 0.0316 0.0264 0.0288
08:01-09:00, Fri., 12 Sep. 0.0308 0.0266 0.0287
07:01-08:00, Fri., 12 Sep. 0.0312 0.0263 0.0287
06:01-07:00, Fri., 12 Sep. 0.0321 0.0270 0.0288
05:01-06:00, Fri., 12 Sep. 0.0308 0.0269 0.0289
04:01-05:00, Fri., 12 Sep. 0.0318 0.0276 0.0300
03:01-04:00, Fri., 12 Sep. 0.0348 0.0295 0.0319
02:01-03:00, Fri., 12 Sep. 0.0341 0.0290 0.0317
01:01-02:00, Fri., 12 Sep. 0.0345 0.0273 0.0308
00:01-01:00, Fri., 12 Sep. 0.0370 0.0312 0.0338
23:01-24:00, Thu., 11 Sep. 0.0378 0.0288 0.0342
22:01-23:00, Thu., 11 Sep. 0.0338 0.0283 0.0307
21:01-22:00, Thu., 11 Sep. 0.0317 0.0284 0.0299
20:01-21:00, Thu., 11 Sep. 0.0332 0.0275 0.0305
19:01-20:00, Thu., 11 Sep. 0.0325 0.0276 0.0301
18:01-19:00, Thu., 11 Sep. 0.0322 0.0277 0.0299
17:01-18:00, Thu., 11 Sep. 0.0363 0.0282 0.0324
16:01-17:00, Thu., 11 Sep. 0.0448 0.0345 0.0394
15:01-16:00, Thu., 11 Sep. 0.0462 0.0353 0.0411
14:01-15:00, Thu., 11 Sep. 0.0387 0.0280 0.0328
13:01-14:00, Thu., 11 Sep. 0.0322 0.0280 0.0297
12:01-13:00, Thu., 11 Sep. 0.0312 0.0273 0.0296
11:01-12:00, Thu., 11 Sep. 0.0324 0.0271 0.0294
10:01-11:00, Thu., 11 Sep. 0.0311 0.0276 0.0295
09:01-10:00, Thu., 11 Sep. 0.0327 0.0275 0.0298
08:01-09:00, Thu., 11 Sep. 0.0322 0.0276 0.0297
07:01-08:00, Thu., 11 Sep. 0.0323 0.0269 0.0292
06:01-07:00, Thu., 11 Sep. 0.0310 0.0270 0.0288
05:01-06:00, Thu., 11 Sep. 0.0314 0.0266 0.0290
04:01-05:00, Thu., 11 Sep. 0.0311 0.0272 0.0292
03:01-04:00, Thu., 11 Sep. 0.0309 0.0273 0.0293
02:01-03:00, Thu., 11 Sep. 0.0308 0.0266 0.0291
01:01-02:00, Thu., 11 Sep. 0.0315 0.0275 0.0293
00:01-01:00, Thu., 11 Sep. 0.0318 0.0273 0.0295
23:01-24:00, Wed., 10 Sep. 0.0313 0.0269 0.0295
22:01-23:00, Wed., 10 Sep. 0.0314 0.0255 0.0292
21:01-22:00, Wed., 10 Sep. 0.0311 0.0270 0.0291
20:01-21:00, Wed., 10 Sep. 0.0317 0.0270 0.0294
19:01-20:00, Wed., 10 Sep. 0.0317 0.0279 0.0296
18:01-19:00, Wed., 10 Sep. 0.0321 0.0274 0.0293
17:01-18:00, Wed., 10 Sep. 0.0326 0.0277 0.0300
16:01-17:00, Wed., 10 Sep. 0.0365 0.0300 0.0327
15:01-16:00, Wed., 10 Sep. 0.0490 0.0355 0.0411
14:01-15:00, Wed., 10 Sep. 0.0612 0.0461 0.0556
13:01-14:00, Wed., 10 Sep. 0.0531 0.0354 0.0394
12:01-13:00, Wed., 10 Sep. 0.0424 0.0357 0.0389
11:01-12:00, Wed., 10 Sep. 0.0426 0.0289 0.0337
10:01-11:00, Wed., 10 Sep. 0.0329 0.0281 0.0307
09:01-10:00, Wed., 10 Sep. 0.0336 0.0290 0.0309
08:01-09:00, Wed., 10 Sep. 0.0332 0.0282 0.0307
07:01-08:00, Wed., 10 Sep. 0.0331 0.0288 0.0310
06:01-07:00, Wed., 10 Sep. 0.0338 0.0288 0.0311
05:01-06:00, Wed., 10 Sep. 0.0334 0.0291 0.0309
04:01-05:00, Wed., 10 Sep. 0.0331 0.0290 0.0309
03:01-04:00, Wed., 10 Sep. 0.0329 0.0289 0.0310
02:01-03:00, Wed., 10 Sep. 0.0329 0.0288 0.0310
01:01-02:00, Wed., 10 Sep. 0.0336 0.0294 0.0310
00:01-01:00, Wed., 10 Sep. 0.0332 0.0289 0.0309
23:01-24:00, Tue., 09 Sep. 0.0332 0.0285 0.0310
22:01-23:00, Tue., 09 Sep. 0.0332 0.0285 0.0310
21:01-22:00, Tue., 09 Sep. 0.0325 0.0291 0.0310
20:01-21:00, Tue., 09 Sep. 0.0329 0.0283 0.0309
19:01-20:00, Tue., 09 Sep. 0.0330 0.0284 0.0307
18:01-19:00, Tue., 09 Sep. 0.0336 0.0287 0.0308
17:01-18:00, Tue., 09 Sep. 0.0331 0.0284 0.0307
16:01-17:00, Tue., 09 Sep. 0.0325 0.0284 0.0304
15:01-16:00, Tue., 09 Sep. 0.0327 0.0277 0.0306
14:01-15:00, Tue., 09 Sep. 0.0329 0.0286 0.0304
13:01-14:00, Tue., 09 Sep. 0.0326 0.0278 0.0305
12:01-13:00, Tue., 09 Sep. 0.0325 0.0275 0.0301
11:01-12:00, Tue., 09 Sep. 0.0339 0.0287 0.0304
10:01-11:00, Tue., 09 Sep. 0.0332 0.0288 0.0304
09:01-10:00, Tue., 09 Sep. 0.0331 0.0275 0.0303
08:01-09:00, Tue., 09 Sep. 0.0325 0.0280 0.0302
07:01-08:00, Tue., 09 Sep. 0.0328 0.0283 0.0306
06:01-07:00, Tue., 09 Sep. 0.0334 0.0284 0.0304
05:01-06:00, Tue., 09 Sep. 0.0326 0.0276 0.0304
04:01-05:00, Tue., 09 Sep. 0.0335 0.0288 0.0306
03:01-04:00, Tue., 09 Sep. 0.0328 0.0284 0.0304
02:01-03:00, Tue., 09 Sep. 0.0326 0.0287 0.0304
01:01-02:00, Tue., 09 Sep. 0.0323 0.0288 0.0304
00:01-01:00, Tue., 09 Sep. 0.0336 0.0283 0.0305
23:01-24:00, Mon., 08 Sep. 0.0322 0.0284 0.0304
22:01-23:00, Mon., 08 Sep. 0.0319 0.0280 0.0303
21:01-22:00, Mon., 08 Sep. 0.0332 0.0286 0.0309
20:01-21:00, Mon., 08 Sep. 0.0356 0.0306 0.0329
19:01-20:00, Mon., 08 Sep. 0.0436 0.0327 0.0378
18:01-19:00, Mon., 08 Sep. 0.0427 0.0297 0.0364
17:01-18:00, Mon., 08 Sep. 0.0329 0.0282 0.0306
16:01-17:00, Mon., 08 Sep. 0.0325 0.0284 0.0305
15:01-16:00, Mon., 08 Sep. 0.0325 0.0280 0.0302
14:01-15:00, Mon., 08 Sep. 0.0322 0.0283 0.0303
13:01-14:00, Mon., 08 Sep. 0.0329 0.0282 0.0302
12:01-13:00, Mon., 08 Sep. 0.0318 0.0283 0.0300
11:01-12:00, Mon., 08 Sep. 0.0320 0.0285 0.0301
10:01-11:00, Mon., 08 Sep. 0.0320 0.0275 0.0301
09:01-10:00, Mon., 08 Sep. 0.0326 0.0283 0.0301
08:01-09:00, Mon., 08 Sep. 0.0328 0.0275 0.0303
07:01-08:00, Mon., 08 Sep. 0.0335 0.0289 0.0309
06:01-07:00, Mon., 08 Sep. 0.0331 0.0282 0.0306
05:01-06:00, Mon., 08 Sep. 0.0327 0.0281 0.0299
04:01-05:00, Mon., 08 Sep. 0.0322 0.0281 0.0300
03:01-04:00, Mon., 08 Sep. 0.0326 0.0284 0.0306
02:01-03:00, Mon., 08 Sep. 0.0323 0.0273 0.0301
01:01-02:00, Mon., 08 Sep. 0.0321 0.0280 0.0301
00:01-01:00, Mon., 08 Sep. 0.0322 0.0277 0.0299
23:01-24:00, Sun., 07 Sep. 0.0326 0.0281 0.0299
22:01-23:00, Sun., 07 Sep. 0.0323 0.0273 0.0304
21:01-22:00, Sun., 07 Sep. 0.0329 0.0285 0.0305
20:01-21:00, Sun., 07 Sep. 0.0318 0.0285 0.0302
19:01-20:00, Sun., 07 Sep. 0.0325 0.0283 0.0300
18:01-19:00, Sun., 07 Sep. 0.0330 0.0280 0.0304
17:01-18:00, Sun., 07 Sep. 0.0320 0.0274 0.0301
16:01-17:00, Sun., 07 Sep. 0.0325 0.0276 0.0298
15:01-16:00, Sun., 07 Sep. 0.0321 0.0282 0.0299
14:01-15:00, Sun., 07 Sep. 0.0332 0.0284 0.0303
13:01-14:00, Sun., 07 Sep. 0.0324 0.0279 0.0303
12:01-13:00, Sun., 07 Sep. 0.0318 0.0270 0.0300
11:01-12:00, Sun., 07 Sep. 0.0321 0.0278 0.0302
10:01-11:00, Sun., 07 Sep. 0.0325 0.0280 0.0304
09:01-10:00, Sun., 07 Sep. 0.0323 0.0280 0.0301
08:01-09:00, Sun., 07 Sep. 0.0329 0.0282 0.0303
07:01-08:00, Sun., 07 Sep. 0.0319 0.0276 0.0299
06:01-07:00, Sun., 07 Sep. 0.0321 0.0287 0.0303
05:01-06:00, Sun., 07 Sep. 0.0322 0.0276 0.0300
04:01-05:00, Sun., 07 Sep. 0.0319 0.0278 0.0297
03:01-04:00, Sun., 07 Sep. 0.0322 0.0280 0.0298
02:01-03:00, Sun., 07 Sep. 0.0323 0.0282 0.0300
01:01-02:00, Sun., 07 Sep. 0.0321 0.0280 0.0300
00:01-01:00, Sun., 07 Sep. 0.0329 0.0285 0.0301
23:01-24:00, Sat., 06 Sep. 0.0324 0.0282 0.0302
22:01-23:00, Sat., 06 Sep. 0.0329 0.0278 0.0302
21:01-22:00, Sat., 06 Sep. 0.0328 0.0273 0.0303
20:01-21:00, Sat., 06 Sep. 0.0326 0.0276 0.0301
19:01-20:00, Sat., 06 Sep. 0.0329 0.0287 0.0304
18:01-19:00, Sat., 06 Sep. 0.0335 0.0276 0.0303
17:01-18:00, Sat., 06 Sep. 0.0319 0.0276 0.0300
16:01-17:00, Sat., 06 Sep. 0.0329 0.0276 0.0298
15:01-16:00, Sat., 06 Sep. 0.0322 0.0280 0.0297
14:01-15:00, Sat., 06 Sep. 0.0330 0.0274 0.0299
13:01-14:00, Sat., 06 Sep. 0.0317 0.0276 0.0297
12:01-13:00, Sat., 06 Sep. 0.0318 0.0280 0.0298
11:01-12:00, Sat., 06 Sep. 0.0326 0.0265 0.0302
10:01-11:00, Sat., 06 Sep. 0.0325 0.0283 0.0303
09:01-10:00, Sat., 06 Sep. 0.0324 0.0280 0.0300
08:01-09:00, Sat., 06 Sep. 0.0311 0.0270 0.0294
07:01-08:00, Sat., 06 Sep. 0.0318 0.0270 0.0293
06:01-07:00, Sat., 06 Sep. 0.0312 0.0264 0.0288
05:01-06:00, Sat., 06 Sep. 0.0307 0.0269 0.0287
04:01-05:00, Sat., 06 Sep. 0.0324 0.0270 0.0292
03:01-04:00, Sat., 06 Sep. 0.0311 0.0273 0.0290
02:01-03:00, Sat., 06 Sep. 0.0318 0.0272 0.0294
01:01-02:00, Sat., 06 Sep. 0.0311 0.0272 0.0295
00:01-01:00, Sat., 06 Sep. 0.0310 0.0278 0.0295
23:01-24:00, Fri., 05 Sep. 0.0319 0.0267 0.0291
22:01-23:00, Fri., 05 Sep. 0.0317 0.0270 0.0293
21:01-22:00, Fri., 05 Sep. 0.0312 0.0273 0.0292
20:01-21:00, Fri., 05 Sep. 0.0317 0.0265 0.0290
19:01-20:00, Fri., 05 Sep. 0.0306 0.0266 0.0285
18:01-19:00, Fri., 05 Sep. 0.0304 0.0266 0.0287
17:01-18:00, Fri., 05 Sep. 0.0313 0.0266 0.0291
16:01-17:00, Fri., 05 Sep. 0.0353 0.0290 0.0321
15:01-16:00, Fri., 05 Sep. 0.0363 0.0320 0.0341
14:01-15:00, Fri., 05 Sep. 0.0372 0.0322 0.0350
13:01-14:00, Fri., 05 Sep. 0.0360 0.0301 0.0328
12:01-13:00, Fri., 05 Sep. 0.0332 0.0284 0.0306
11:01-12:00, Fri., 05 Sep. 0.0326 0.0281 0.0307
10:01-11:00, Fri., 05 Sep. 0.0322 0.0284 0.0305
09:01-10:00, Fri., 05 Sep. 0.0336 0.0283 0.0305
08:01-09:00, Fri., 05 Sep. 0.0324 0.0277 0.0299
07:01-08:00, Fri., 05 Sep. 0.0323 0.0281 0.0297
06:01-07:00, Fri., 05 Sep. 0.0320 0.0281 0.0300