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】

We will suspend the provision of data in part or whole of the following time slots by interruption of power supply and relevant facilities due to maintenance and inspection of equipment.

From 9:00 to 13:00 on Tuesday, June 26,2018 Hachioji
From 13:00 to 17:00 on Thursday, June 26,2018 Adachi
From 9:00 to 13:00 on Wednesday, June 27,2018 Chofu
From 13:00 to 17:00 on Wednesday, June 27,2018 Ota
From 9:00 to 13:00 on Thursday, June 28,2018 Kodaira 
From 13:00 to 17:00 on Thursday, June 28,2018 Edogawa
From 9:00 to 13:00 on Friday, June 29,2018 Shinjuku







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
20:01-21:00, Thu., 20 Sep. 0.0414 0.0359 0.0383
19:01-20:00, Thu., 20 Sep. 0.0389 0.0328 0.0352
18:01-19:00, Thu., 20 Sep. 0.0380 0.0314 0.0345
17:01-18:00, Thu., 20 Sep. 0.0389 0.0323 0.0356
16:01-17:00, Thu., 20 Sep. 0.0403 0.0354 0.0376
15:01-16:00, Thu., 20 Sep. 0.0406 0.0347 0.0370
14:01-15:00, Thu., 20 Sep. 0.0380 0.0322 0.0352
13:01-14:00, Thu., 20 Sep. 0.0338 0.0286 0.0308
12:01-13:00, Thu., 20 Sep. 0.0333 0.0288 0.0310
11:01-12:00, Thu., 20 Sep. 0.0330 0.0288 0.0307
10:01-11:00, Thu., 20 Sep. 0.0324 0.0290 0.0307
09:01-10:00, Thu., 20 Sep. 0.0335 0.0284 0.0303
08:01-09:00, Thu., 20 Sep. 0.0323 0.0285 0.0308
07:01-08:00, Thu., 20 Sep. 0.0329 0.0280 0.0304
06:01-07:00, Thu., 20 Sep. 0.0319 0.0285 0.0304
05:01-06:00, Thu., 20 Sep. 0.0327 0.0290 0.0307
04:01-05:00, Thu., 20 Sep. 0.0318 0.0272 0.0293
03:01-04:00, Thu., 20 Sep. 0.0302 0.0269 0.0287
02:01-03:00, Thu., 20 Sep. 0.0321 0.0283 0.0302
01:01-02:00, Thu., 20 Sep. 0.0325 0.0286 0.0303
00:01-01:00, Thu., 20 Sep. 0.0320 0.0284 0.0303
23:01-24:00, Wed., 19 Sep. 0.0322 0.0281 0.0304
22:01-23:00, Wed., 19 Sep. 0.0323 0.0289 0.0303
21:01-22:00, Wed., 19 Sep. 0.0325 0.0286 0.0303
20:01-21:00, Wed., 19 Sep. 0.0321 0.0287 0.0305
19:01-20:00, Wed., 19 Sep. 0.0320 0.0287 0.0302
18:01-19:00, Wed., 19 Sep. 0.0320 0.0284 0.0301
17:01-18:00, Wed., 19 Sep. 0.0323 0.0283 0.0300
16:01-17:00, Wed., 19 Sep. 0.0318 0.0279 0.0302
15:01-16:00, Wed., 19 Sep. 0.0322 0.0279 0.0299
14:01-15:00, Wed., 19 Sep. 0.0319 0.0281 0.0299
13:01-14:00, Wed., 19 Sep. 0.0316 0.0284 0.0300
12:01-13:00, Wed., 19 Sep. 0.0324 0.0287 0.0301
11:01-12:00, Wed., 19 Sep. 0.0316 0.0277 0.0299
10:01-11:00, Wed., 19 Sep. 0.0328 0.0287 0.0303
09:01-10:00, Wed., 19 Sep. 0.0319 0.0281 0.0303
08:01-09:00, Wed., 19 Sep. 0.0321 0.0280 0.0298
07:01-08:00, Wed., 19 Sep. 0.0316 0.0274 0.0296
06:01-07:00, Wed., 19 Sep. 0.0325 0.0279 0.0299
05:01-06:00, Wed., 19 Sep. 0.0326 0.0283 0.0300
04:01-05:00, Wed., 19 Sep. 0.0319 0.0284 0.0298
03:01-04:00, Wed., 19 Sep. 0.0315 0.0276 0.0299
02:01-03:00, Wed., 19 Sep. 0.0326 0.0289 0.0308
01:01-02:00, Wed., 19 Sep. 0.0368 0.0299 0.0330
00:01-01:00, Wed., 19 Sep. 0.0502 0.0343 0.0418
23:01-24:00, Tue., 18 Sep. 0.0582 0.0443 0.0510
22:01-23:00, Tue., 18 Sep. 0.0458 0.0275 0.0342
21:01-22:00, Tue., 18 Sep. 0.0317 0.0273 0.0299
20:01-21:00, Tue., 18 Sep. 0.0347 0.0289 0.0322
19:01-20:00, Tue., 18 Sep. 0.0455 0.0330 0.0392
18:01-19:00, Tue., 18 Sep. 0.0488 0.0392 0.0442
17:01-18:00, Tue., 18 Sep. 0.0426 0.0283 0.0345
16:01-17:00, Tue., 18 Sep. 0.0318 0.0282 0.0299
15:01-16:00, Tue., 18 Sep. 0.0323 0.0277 0.0295
14:01-15:00, Tue., 18 Sep. 0.0318 0.0278 0.0297
13:01-14:00, Tue., 18 Sep. 0.0318 0.0280 0.0296
12:01-13:00, Tue., 18 Sep. 0.0311 0.0282 0.0296
11:01-12:00, Tue., 18 Sep. 0.0314 0.0272 0.0294
10:01-11:00, Tue., 18 Sep. 0.0316 0.0267 0.0292
09:01-10:00, Tue., 18 Sep. 0.0314 0.0275 0.0296
08:01-09:00, Tue., 18 Sep. 0.0308 0.0270 0.0290
07:01-08:00, Tue., 18 Sep. 0.0311 0.0276 0.0290
06:01-07:00, Tue., 18 Sep. 0.0309 0.0271 0.0291
05:01-06:00, Tue., 18 Sep. 0.0309 0.0271 0.0292
04:01-05:00, Tue., 18 Sep. 0.0315 0.0274 0.0293
03:01-04:00, Tue., 18 Sep. 0.0311 0.0273 0.0293
02:01-03:00, Tue., 18 Sep. 0.0316 0.0279 0.0295
01:01-02:00, Tue., 18 Sep. 0.0332 0.0286 0.0305
00:01-01:00, Tue., 18 Sep. 0.0380 0.0302 0.0338
23:01-24:00, Mon., 17 Sep. 0.0395 0.0287 0.0346
22:01-23:00, Mon., 17 Sep. 0.0319 0.0274 0.0294
21:01-22:00, Mon., 17 Sep. 0.0323 0.0280 0.0305
20:01-21:00, Mon., 17 Sep. 0.0388 0.0302 0.0336
19:01-20:00, Mon., 17 Sep. 0.0542 0.0362 0.0447
18:01-19:00, Mon., 17 Sep. 0.0687 0.0425 0.0574
17:01-18:00, Mon., 17 Sep. 0.0435 0.0309 0.0358
16:01-17:00, Mon., 17 Sep. 0.0346 0.0292 0.0322
15:01-16:00, Mon., 17 Sep. 0.0336 0.0284 0.0305
14:01-15:00, Mon., 17 Sep. 0.0329 0.0283 0.0306
13:01-14:00, Mon., 17 Sep. 0.0324 0.0287 0.0304
12:01-13:00, Mon., 17 Sep. 0.0322 0.0289 0.0304
11:01-12:00, Mon., 17 Sep. 0.0326 0.0287 0.0307
10:01-11:00, Mon., 17 Sep. 0.0328 0.0290 0.0307
09:01-10:00, Mon., 17 Sep. 0.0329 0.0290 0.0308
08:01-09:00, Mon., 17 Sep. 0.0326 0.0289 0.0305
07:01-08:00, Mon., 17 Sep. 0.0329 0.0278 0.0303
06:01-07:00, Mon., 17 Sep. 0.0324 0.0283 0.0302
05:01-06:00, Mon., 17 Sep. 0.0315 0.0280 0.0300
04:01-05:00, Mon., 17 Sep. 0.0319 0.0279 0.0299
03:01-04:00, Mon., 17 Sep. 0.0327 0.0279 0.0300
02:01-03:00, Mon., 17 Sep. 0.0314 0.0279 0.0298
01:01-02:00, Mon., 17 Sep. 0.0324 0.0281 0.0299
00:01-01:00, Mon., 17 Sep. 0.0332 0.0280 0.0301
23:01-24:00, Sun., 16 Sep. 0.0320 0.0277 0.0298
22:01-23:00, Sun., 16 Sep. 0.0315 0.0278 0.0297
21:01-22:00, Sun., 16 Sep. 0.0323 0.0285 0.0304
20:01-21:00, Sun., 16 Sep. 0.0310 0.0282 0.0296
19:01-20:00, Sun., 16 Sep. 0.0317 0.0271 0.0296
18:01-19:00, Sun., 16 Sep. 0.0323 0.0273 0.0298
17:01-18:00, Sun., 16 Sep. 0.0326 0.0282 0.0298
16:01-17:00, Sun., 16 Sep. 0.0320 0.0275 0.0299
15:01-16:00, Sun., 16 Sep. 0.0318 0.0277 0.0298
14:01-15:00, Sun., 16 Sep. 0.0317 0.0277 0.0297
13:01-14:00, Sun., 16 Sep. 0.0320 0.0281 0.0297
12:01-13:00, Sun., 16 Sep. 0.0319 0.0269 0.0299
11:01-12:00, Sun., 16 Sep. 0.0315 0.0276 0.0295
10:01-11:00, Sun., 16 Sep. 0.0322 0.0280 0.0296
09:01-10:00, Sun., 16 Sep. 0.0312 0.0278 0.0295
08:01-09:00, Sun., 16 Sep. 0.0323 0.0275 0.0298
07:01-08:00, Sun., 16 Sep. 0.0315 0.0277 0.0297
06:01-07:00, Sun., 16 Sep. 0.0313 0.0281 0.0296
05:01-06:00, Sun., 16 Sep. 0.0317 0.0279 0.0297
04:01-05:00, Sun., 16 Sep. 0.0320 0.0274 0.0296
03:01-04:00, Sun., 16 Sep. 0.0311 0.0280 0.0297
02:01-03:00, Sun., 16 Sep. 0.0318 0.0272 0.0296
01:01-02:00, Sun., 16 Sep. 0.0314 0.0274 0.0294
00:01-01:00, Sun., 16 Sep. 0.0312 0.0273 0.0293
23:01-24:00, Sat., 15 Sep. 0.0312 0.0264 0.0291
22:01-23:00, Sat., 15 Sep. 0.0310 0.0273 0.0291
21:01-22:00, Sat., 15 Sep. 0.0315 0.0273 0.0292
20:01-21:00, Sat., 15 Sep. 0.0311 0.0267 0.0291
19:01-20:00, Sat., 15 Sep. 0.0312 0.0275 0.0293
18:01-19:00, Sat., 15 Sep. 0.0320 0.0272 0.0294
17:01-18:00, Sat., 15 Sep. 0.0316 0.0270 0.0292
16:01-17:00, Sat., 15 Sep. 0.0304 0.0275 0.0291
15:01-16:00, Sat., 15 Sep. 0.0312 0.0279 0.0295
14:01-15:00, Sat., 15 Sep. 0.0342 0.0283 0.0301
13:01-14:00, Sat., 15 Sep. 0.0356 0.0303 0.0327
12:01-13:00, Sat., 15 Sep. 0.0357 0.0322 0.0342
11:01-12:00, Sat., 15 Sep. 0.0365 0.0324 0.0347
10:01-11:00, Sat., 15 Sep. 0.0354 0.0313 0.0335
09:01-10:00, Sat., 15 Sep. 0.0350 0.0305 0.0326
08:01-09:00, Sat., 15 Sep. 0.0387 0.0323 0.0350
07:01-08:00, Sat., 15 Sep. 0.0367 0.0279 0.0320
06:01-07:00, Sat., 15 Sep. 0.0309 0.0273 0.0291
05:01-06:00, Sat., 15 Sep. 0.0314 0.0275 0.0293
04:01-05:00, Sat., 15 Sep. 0.0314 0.0272 0.0292
03:01-04:00, Sat., 15 Sep. 0.0323 0.0278 0.0299
02:01-03:00, Sat., 15 Sep. 0.0338 0.0287 0.0312
01:01-02:00, Sat., 15 Sep. 0.0339 0.0296 0.0318
00:01-01:00, Sat., 15 Sep. 0.0347 0.0294 0.0320
23:01-24:00, Fri., 14 Sep. 0.0327 0.0290 0.0310
22:01-23:00, Fri., 14 Sep. 0.0314 0.0276 0.0299
21:01-22:00, Fri., 14 Sep. 0.0309 0.0275 0.0294
20:01-21:00, Fri., 14 Sep. 0.0312 0.0272 0.0294
19:01-20:00, Fri., 14 Sep. 0.0312 0.0263 0.0295
18:01-19:00, Fri., 14 Sep. 0.0312 0.0271 0.0293
17:01-18:00, Fri., 14 Sep. 0.0313 0.0280 0.0292
16:01-17:00, Fri., 14 Sep. 0.0304 0.0274 0.0293
15:01-16:00, Fri., 14 Sep. 0.0305 0.0273 0.0291
14:01-15:00, Fri., 14 Sep. 0.0305 0.0272 0.0289
13:01-14:00, Fri., 14 Sep. 0.0309 0.0263 0.0287
12:01-13:00, Fri., 14 Sep. 0.0308 0.0273 0.0289
11:01-12:00, Fri., 14 Sep. 0.0318 0.0285 0.0298
10:01-11:00, Fri., 14 Sep. 0.0333 0.0283 0.0310
09:01-10:00, Fri., 14 Sep. 0.0363 0.0306 0.0335
08:01-09:00, Fri., 14 Sep. 0.0371 0.0316 0.0348
07:01-08:00, Fri., 14 Sep. 0.0354 0.0301 0.0326
06:01-07:00, Fri., 14 Sep. 0.0348 0.0300 0.0321
05:01-06:00, Fri., 14 Sep. 0.0329 0.0286 0.0303
04:01-05:00, Fri., 14 Sep. 0.0331 0.0284 0.0305
03:01-04:00, Fri., 14 Sep. 0.0333 0.0296 0.0313
02:01-03:00, Fri., 14 Sep. 0.0329 0.0286 0.0311
01:01-02:00, Fri., 14 Sep. 0.0350 0.0307 0.0326
00:01-01:00, Fri., 14 Sep. 0.0349 0.0304 0.0324
23:01-24:00, Thu., 13 Sep. 0.0329 0.0288 0.0312
22:01-23:00, Thu., 13 Sep. 0.0330 0.0297 0.0313
21:01-22:00, Thu., 13 Sep. 0.0354 0.0304 0.0326
20:01-21:00, Thu., 13 Sep. 0.0357 0.0289 0.0327
19:01-20:00, Thu., 13 Sep. 0.0316 0.0271 0.0296
18:01-19:00, Thu., 13 Sep. 0.0310 0.0274 0.0293
17:01-18:00, Thu., 13 Sep. 0.0315 0.0277 0.0296
16:01-17:00, Thu., 13 Sep. 0.0311 0.0275 0.0295
15:01-16:00, Thu., 13 Sep. 0.0316 0.0274 0.0294
14:01-15:00, Thu., 13 Sep. 0.0313 0.0278 0.0296
13:01-14:00, Thu., 13 Sep. 0.0319 0.0281 0.0298
12:01-13:00, Thu., 13 Sep. 0.0314 0.0281 0.0298
11:01-12:00, Thu., 13 Sep. 0.0315 0.0280 0.0296
10:01-11:00, Thu., 13 Sep. 0.0318 0.0283 0.0300
09:01-10:00, Thu., 13 Sep. 0.0321 0.0278 0.0302
08:01-09:00, Thu., 13 Sep. 0.0317 0.0284 0.0301
07:01-08:00, Thu., 13 Sep. 0.0314 0.0279 0.0298
06:01-07:00, Thu., 13 Sep. 0.0320 0.0280 0.0301
05:01-06:00, Thu., 13 Sep. 0.0322 0.0282 0.0302
04:01-05:00, Thu., 13 Sep. 0.0312 0.0274 0.0299
03:01-04:00, Thu., 13 Sep. 0.0323 0.0284 0.0301
02:01-03:00, Thu., 13 Sep. 0.0326 0.0287 0.0302
01:01-02:00, Thu., 13 Sep. 0.0322 0.0281 0.0300
00:01-01:00, Thu., 13 Sep. 0.0323 0.0279 0.0300
23:01-24:00, Wed., 12 Sep. 0.0323 0.0286 0.0303
22:01-23:00, Wed., 12 Sep. 0.0329 0.0284 0.0309
21:01-22:00, Wed., 12 Sep. 0.0321 0.0280 0.0302
20:01-21:00, Wed., 12 Sep. 0.0321 0.0274 0.0298
19:01-20:00, Wed., 12 Sep. 0.0317 0.0282 0.0297
18:01-19:00, Wed., 12 Sep. 0.0311 0.0276 0.0294
17:01-18:00, Wed., 12 Sep. 0.0316 0.0275 0.0293
16:01-17:00, Wed., 12 Sep. 0.0314 0.0280 0.0296
15:01-16:00, Wed., 12 Sep. 0.0317 0.0279 0.0296
14:01-15:00, Wed., 12 Sep. 0.0310 0.0271 0.0293
13:01-14:00, Wed., 12 Sep. 0.0308 0.0275 0.0292
12:01-13:00, Wed., 12 Sep. 0.0313 0.0273 0.0292
11:01-12:00, Wed., 12 Sep. 0.0319 0.0274 0.0294
10:01-11:00, Wed., 12 Sep. 0.0318 0.0272 0.0295
09:01-10:00, Wed., 12 Sep. 0.0312 0.0272 0.0295
08:01-09:00, Wed., 12 Sep. 0.0312 0.0280 0.0296
07:01-08:00, Wed., 12 Sep. 0.0310 0.0275 0.0294
06:01-07:00, Wed., 12 Sep. 0.0312 0.0277 0.0293
05:01-06:00, Wed., 12 Sep. 0.0308 0.0270 0.0292
04:01-05:00, Wed., 12 Sep. 0.0313 0.0281 0.0296
03:01-04:00, Wed., 12 Sep. 0.0312 0.0273 0.0294
02:01-03:00, Wed., 12 Sep. 0.0318 0.0270 0.0292
01:01-02:00, Wed., 12 Sep. 0.0309 0.0275 0.0292
00:01-01:00, Wed., 12 Sep. 0.0319 0.0273 0.0293
23:01-24:00, Tue., 11 Sep. 0.0313 0.0277 0.0296
22:01-23:00, Tue., 11 Sep. 0.0315 0.0269 0.0291
21:01-22:00, Tue., 11 Sep. 0.0316 0.0264 0.0293
20:01-21:00, Tue., 11 Sep. 0.0313 0.0271 0.0292
19:01-20:00, Tue., 11 Sep. 0.0318 0.0276 0.0292
18:01-19:00, Tue., 11 Sep. 0.0320 0.0275 0.0293
17:01-18:00, Tue., 11 Sep. 0.0312 0.0274 0.0293
16:01-17:00, Tue., 11 Sep. 0.0309 0.0278 0.0292
15:01-16:00, Tue., 11 Sep. 0.0321 0.0271 0.0292
14:01-15:00, Tue., 11 Sep. 0.0310 0.0275 0.0292
13:01-14:00, Tue., 11 Sep. 0.0306 0.0276 0.0290
12:01-13:00, Tue., 11 Sep. 0.0307 0.0266 0.0289
11:01-12:00, Tue., 11 Sep. 0.0310 0.0265 0.0289
10:01-11:00, Tue., 11 Sep. 0.0309 0.0274 0.0291
09:01-10:00, Tue., 11 Sep. 0.0307 0.0277 0.0291
08:01-09:00, Tue., 11 Sep. 0.0320 0.0266 0.0291
07:01-08:00, Tue., 11 Sep. 0.0311 0.0274 0.0291
06:01-07:00, Tue., 11 Sep. 0.0320 0.0273 0.0291
05:01-06:00, Tue., 11 Sep. 0.0314 0.0271 0.0292
04:01-05:00, Tue., 11 Sep. 0.0324 0.0282 0.0302
03:01-04:00, Tue., 11 Sep. 0.0364 0.0291 0.0325
02:01-03:00, Tue., 11 Sep. 0.0482 0.0341 0.0390
01:01-02:00, Tue., 11 Sep. 0.0513 0.0350 0.0430
00:01-01:00, Tue., 11 Sep. 0.0383 0.0335 0.0358
23:01-24:00, Mon., 10 Sep. 0.0360 0.0321 0.0337
22:01-23:00, Mon., 10 Sep. 0.0361 0.0322 0.0339
21:01-22:00, Mon., 10 Sep. 0.0347 0.0310 0.0330