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
08:01-09:00, Sat., 23 Jun. 0.0328 0.0288 0.0306
07:01-08:00, Sat., 23 Jun. 0.0324 0.0285 0.0303
06:01-07:00, Sat., 23 Jun. 0.0330 0.0284 0.0308
05:01-06:00, Sat., 23 Jun. 0.0331 0.0297 0.0313
04:01-05:00, Sat., 23 Jun. 0.0333 0.0294 0.0312
03:01-04:00, Sat., 23 Jun. 0.0331 0.0293 0.0309
02:01-03:00, Sat., 23 Jun. 0.0331 0.0290 0.0307
01:01-02:00, Sat., 23 Jun. 0.0333 0.0292 0.0309
00:01-01:00, Sat., 23 Jun. 0.0329 0.0290 0.0308
23:01-24:00, Fri., 22 Jun. 0.0332 0.0288 0.0310
22:01-23:00, Fri., 22 Jun. 0.0334 0.0292 0.0310
21:01-22:00, Fri., 22 Jun. 0.0330 0.0286 0.0307
20:01-21:00, Fri., 22 Jun. 0.0323 0.0286 0.0304
19:01-20:00, Fri., 22 Jun. 0.0324 0.0280 0.0302
18:01-19:00, Fri., 22 Jun. 0.0325 0.0289 0.0304
17:01-18:00, Fri., 22 Jun. 0.0323 0.0283 0.0303
16:01-17:00, Fri., 22 Jun. 0.0328 0.0284 0.0304
15:01-16:00, Fri., 22 Jun. 0.0318 0.0280 0.0301
14:01-15:00, Fri., 22 Jun. 0.0320 0.0276 0.0303
13:01-14:00, Fri., 22 Jun. 0.0321 0.0285 0.0302
12:01-13:00, Fri., 22 Jun. 0.0325 0.0279 0.0302
11:01-12:00, Fri., 22 Jun. 0.0320 0.0282 0.0304
10:01-11:00, Fri., 22 Jun. 0.0327 0.0287 0.0306
09:01-10:00, Fri., 22 Jun. 0.0328 0.0285 0.0308
08:01-09:00, Fri., 22 Jun. 0.0321 0.0286 0.0305
07:01-08:00, Fri., 22 Jun. 0.0330 0.0283 0.0305
06:01-07:00, Fri., 22 Jun. 0.0326 0.0290 0.0306
05:01-06:00, Fri., 22 Jun. 0.0324 0.0275 0.0304
04:01-05:00, Fri., 22 Jun. 0.0329 0.0278 0.0302
03:01-04:00, Fri., 22 Jun. 0.0323 0.0278 0.0299
02:01-03:00, Fri., 22 Jun. 0.0324 0.0280 0.0301
01:01-02:00, Fri., 22 Jun. 0.0324 0.0288 0.0304
00:01-01:00, Fri., 22 Jun. 0.0334 0.0289 0.0305
23:01-24:00, Thu., 21 Jun. 0.0322 0.0284 0.0303
22:01-23:00, Thu., 21 Jun. 0.0321 0.0285 0.0302
21:01-22:00, Thu., 21 Jun. 0.0321 0.0284 0.0304
20:01-21:00, Thu., 21 Jun. 0.0324 0.0278 0.0304
19:01-20:00, Thu., 21 Jun. 0.0320 0.0281 0.0301
18:01-19:00, Thu., 21 Jun. 0.0320 0.0279 0.0301
17:01-18:00, Thu., 21 Jun. 0.0318 0.0279 0.0300
16:01-17:00, Thu., 21 Jun. 0.0320 0.0278 0.0298
15:01-16:00, Thu., 21 Jun. 0.0328 0.0282 0.0301
14:01-15:00, Thu., 21 Jun. 0.0312 0.0273 0.0292
13:01-14:00, Thu., 21 Jun. 0.0312 0.0275 0.0295
12:01-13:00, Thu., 21 Jun. 0.0311 0.0271 0.0293
11:01-12:00, Thu., 21 Jun. 0.0312 0.0273 0.0293
10:01-11:00, Thu., 21 Jun. 0.0318 0.0279 0.0298
09:01-10:00, Thu., 21 Jun. 0.0312 0.0277 0.0294
08:01-09:00, Thu., 21 Jun. 0.0314 0.0273 0.0292
07:01-08:00, Thu., 21 Jun. 0.0311 0.0268 0.0291
06:01-07:00, Thu., 21 Jun. 0.0325 0.0268 0.0300
05:01-06:00, Thu., 21 Jun. 0.0347 0.0294 0.0321
04:01-05:00, Thu., 21 Jun. 0.0371 0.0300 0.0340
03:01-04:00, Thu., 21 Jun. 0.0322 0.0283 0.0306
02:01-03:00, Thu., 21 Jun. 0.0327 0.0287 0.0307
01:01-02:00, Thu., 21 Jun. 0.0326 0.0289 0.0305
00:01-01:00, Thu., 21 Jun. 0.0364 0.0301 0.0330
23:01-24:00, Wed., 20 Jun. 0.0430 0.0349 0.0388
22:01-23:00, Wed., 20 Jun. 0.0457 0.0367 0.0404
21:01-22:00, Wed., 20 Jun. 0.0435 0.0365 0.0390
20:01-21:00, Wed., 20 Jun. 0.0416 0.0330 0.0363
19:01-20:00, Wed., 20 Jun. 0.0350 0.0288 0.0311
18:01-19:00, Wed., 20 Jun. 0.0318 0.0286 0.0299
17:01-18:00, Wed., 20 Jun. 0.0320 0.0274 0.0300
16:01-17:00, Wed., 20 Jun. 0.0325 0.0276 0.0303
15:01-16:00, Wed., 20 Jun. 0.0328 0.0285 0.0308
14:01-15:00, Wed., 20 Jun. 0.0346 0.0301 0.0320
13:01-14:00, Wed., 20 Jun. 0.0337 0.0297 0.0313
12:01-13:00, Wed., 20 Jun. 0.0369 0.0310 0.0332
11:01-12:00, Wed., 20 Jun. 0.0395 0.0338 0.0360
10:01-11:00, Wed., 20 Jun. 0.0398 0.0330 0.0358
09:01-10:00, Wed., 20 Jun. 0.0400 0.0342 0.0362
08:01-09:00, Wed., 20 Jun. 0.0375 0.0338 0.0357
07:01-08:00, Wed., 20 Jun. 0.0364 0.0308 0.0345
06:01-07:00, Wed., 20 Jun. 0.0353 0.0311 0.0330
05:01-06:00, Wed., 20 Jun. 0.0362 0.0324 0.0343
04:01-05:00, Wed., 20 Jun. 0.0356 0.0311 0.0337
03:01-04:00, Wed., 20 Jun. 0.0335 0.0288 0.0312
02:01-03:00, Wed., 20 Jun. 0.0326 0.0283 0.0306
01:01-02:00, Wed., 20 Jun. 0.0335 0.0281 0.0302
00:01-01:00, Wed., 20 Jun. 0.0324 0.0280 0.0301
23:01-24:00, Tue., 19 Jun. 0.0328 0.0279 0.0303
22:01-23:00, Tue., 19 Jun. 0.0320 0.0277 0.0303
21:01-22:00, Tue., 19 Jun. 0.0323 0.0281 0.0304
20:01-21:00, Tue., 19 Jun. 0.0320 0.0269 0.0302
19:01-20:00, Tue., 19 Jun. 0.0319 0.0282 0.0301
18:01-19:00, Tue., 19 Jun. 0.0323 0.0279 0.0303
17:01-18:00, Tue., 19 Jun. 0.0327 0.0288 0.0300
16:01-17:00, Tue., 19 Jun. 0.0317 0.0279 0.0299
15:01-16:00, Tue., 19 Jun. 0.0322 0.0280 0.0301
14:01-15:00, Tue., 19 Jun. 0.0315 0.0281 0.0299
13:01-14:00, Tue., 19 Jun. 0.0323 0.0274 0.0300
12:01-13:00, Tue., 19 Jun. 0.0318 0.0281 0.0300
11:01-12:00, Tue., 19 Jun. 0.0315 0.0282 0.0299
10:01-11:00, Tue., 19 Jun. 0.0321 0.0282 0.0301
09:01-10:00, Tue., 19 Jun. 0.0323 0.0278 0.0298
08:01-09:00, Tue., 19 Jun. 0.0319 0.0287 0.0299
07:01-08:00, Tue., 19 Jun. 0.0324 0.0283 0.0302
06:01-07:00, Tue., 19 Jun. 0.0325 0.0285 0.0306
05:01-06:00, Tue., 19 Jun. 0.0326 0.0290 0.0306
04:01-05:00, Tue., 19 Jun. 0.0330 0.0279 0.0305
03:01-04:00, Tue., 19 Jun. 0.0326 0.0286 0.0306
02:01-03:00, Tue., 19 Jun. 0.0328 0.0287 0.0306
01:01-02:00, Tue., 19 Jun. 0.0323 0.0285 0.0308
00:01-01:00, Tue., 19 Jun. 0.0328 0.0287 0.0306
23:01-24:00, Mon., 18 Jun. 0.0330 0.0289 0.0308
22:01-23:00, Mon., 18 Jun. 0.0334 0.0295 0.0313
21:01-22:00, Mon., 18 Jun. 0.0327 0.0286 0.0309
20:01-21:00, Mon., 18 Jun. 0.0325 0.0282 0.0306
19:01-20:00, Mon., 18 Jun. 0.0323 0.0292 0.0309
18:01-19:00, Mon., 18 Jun. 0.0339 0.0288 0.0313
17:01-18:00, Mon., 18 Jun. 0.0323 0.0284 0.0302
16:01-17:00, Mon., 18 Jun. 0.0336 0.0287 0.0308
15:01-16:00, Mon., 18 Jun. 0.0342 0.0291 0.0319
14:01-15:00, Mon., 18 Jun. 0.0359 0.0321 0.0337
13:01-14:00, Mon., 18 Jun. 0.0354 0.0285 0.0314
12:01-13:00, Mon., 18 Jun. 0.0323 0.0291 0.0306
11:01-12:00, Mon., 18 Jun. 0.0327 0.0285 0.0307
10:01-11:00, Mon., 18 Jun. 0.0325 0.0285 0.0307
09:01-10:00, Mon., 18 Jun. 0.0331 0.0277 0.0305
08:01-09:00, Mon., 18 Jun. 0.0321 0.0280 0.0302
07:01-08:00, Mon., 18 Jun. 0.0324 0.0288 0.0305
06:01-07:00, Mon., 18 Jun. 0.0321 0.0290 0.0304
05:01-06:00, Mon., 18 Jun. 0.0317 0.0291 0.0303
04:01-05:00, Mon., 18 Jun. 0.0321 0.0282 0.0303
03:01-04:00, Mon., 18 Jun. 0.0317 0.0281 0.0300
02:01-03:00, Mon., 18 Jun. 0.0323 0.0277 0.0299
01:01-02:00, Mon., 18 Jun. 0.0323 0.0279 0.0301
00:01-01:00, Mon., 18 Jun. 0.0321 0.0283 0.0304
23:01-24:00, Sun., 17 Jun. 0.0320 0.0283 0.0303
22:01-23:00, Sun., 17 Jun. 0.0319 0.0278 0.0300
21:01-22:00, Sun., 17 Jun. 0.0321 0.0286 0.0301
20:01-21:00, Sun., 17 Jun. 0.0320 0.0281 0.0300
19:01-20:00, Sun., 17 Jun. 0.0323 0.0283 0.0301
18:01-19:00, Sun., 17 Jun. 0.0322 0.0277 0.0301
17:01-18:00, Sun., 17 Jun. 0.0320 0.0281 0.0299
16:01-17:00, Sun., 17 Jun. 0.0316 0.0288 0.0301
15:01-16:00, Sun., 17 Jun. 0.0323 0.0285 0.0301
14:01-15:00, Sun., 17 Jun. 0.0319 0.0282 0.0301
13:01-14:00, Sun., 17 Jun. 0.0314 0.0283 0.0300
12:01-13:00, Sun., 17 Jun. 0.0311 0.0280 0.0297
11:01-12:00, Sun., 17 Jun. 0.0320 0.0277 0.0298
10:01-11:00, Sun., 17 Jun. 0.0320 0.0283 0.0301
09:01-10:00, Sun., 17 Jun. 0.0325 0.0279 0.0300
08:01-09:00, Sun., 17 Jun. 0.0321 0.0282 0.0299
07:01-08:00, Sun., 17 Jun. 0.0315 0.0277 0.0299
06:01-07:00, Sun., 17 Jun. 0.0319 0.0278 0.0299
05:01-06:00, Sun., 17 Jun. 0.0329 0.0282 0.0299
04:01-05:00, Sun., 17 Jun. 0.0326 0.0286 0.0301
03:01-04:00, Sun., 17 Jun. 0.0317 0.0282 0.0301
02:01-03:00, Sun., 17 Jun. 0.0327 0.0285 0.0300
01:01-02:00, Sun., 17 Jun. 0.0317 0.0280 0.0300
00:01-01:00, Sun., 17 Jun. 0.0314 0.0283 0.0301
23:01-24:00, Sat., 16 Jun. 0.0321 0.0272 0.0298
22:01-23:00, Sat., 16 Jun. 0.0323 0.0284 0.0300
21:01-22:00, Sat., 16 Jun. 0.0330 0.0284 0.0300
20:01-21:00, Sat., 16 Jun. 0.0327 0.0281 0.0299
19:01-20:00, Sat., 16 Jun. 0.0315 0.0281 0.0301
18:01-19:00, Sat., 16 Jun. 0.0329 0.0279 0.0298
17:01-18:00, Sat., 16 Jun. 0.0318 0.0280 0.0297
16:01-17:00, Sat., 16 Jun. 0.0316 0.0280 0.0299
15:01-16:00, Sat., 16 Jun. 0.0316 0.0271 0.0296
14:01-15:00, Sat., 16 Jun. 0.0317 0.0277 0.0296
13:01-14:00, Sat., 16 Jun. 0.0309 0.0280 0.0293
12:01-13:00, Sat., 16 Jun. 0.0309 0.0279 0.0294
11:01-12:00, Sat., 16 Jun. 0.0313 0.0270 0.0294
10:01-11:00, Sat., 16 Jun. 0.0315 0.0276 0.0296
09:01-10:00, Sat., 16 Jun. 0.0318 0.0283 0.0300
08:01-09:00, Sat., 16 Jun. 0.0311 0.0277 0.0293
07:01-08:00, Sat., 16 Jun. 0.0325 0.0280 0.0298
06:01-07:00, Sat., 16 Jun. 0.0333 0.0291 0.0309
05:01-06:00, Sat., 16 Jun. 0.0369 0.0305 0.0333
04:01-05:00, Sat., 16 Jun. 0.0364 0.0323 0.0350
03:01-04:00, Sat., 16 Jun. 0.0365 0.0302 0.0330
02:01-03:00, Sat., 16 Jun. 0.0328 0.0275 0.0301
01:01-02:00, Sat., 16 Jun. 0.0324 0.0284 0.0303
00:01-01:00, Sat., 16 Jun. 0.0344 0.0286 0.0318
23:01-24:00, Fri., 15 Jun. 0.0332 0.0282 0.0304
22:01-23:00, Fri., 15 Jun. 0.0321 0.0277 0.0304
21:01-22:00, Fri., 15 Jun. 0.0324 0.0286 0.0304
20:01-21:00, Fri., 15 Jun. 0.0320 0.0279 0.0299
19:01-20:00, Fri., 15 Jun. 0.0316 0.0277 0.0297
18:01-19:00, Fri., 15 Jun. 0.0315 0.0280 0.0296
17:01-18:00, Fri., 15 Jun. 0.0326 0.0288 0.0303
16:01-17:00, Fri., 15 Jun. 0.0342 0.0283 0.0319
15:01-16:00, Fri., 15 Jun. 0.0369 0.0325 0.0347
14:01-15:00, Fri., 15 Jun. 0.0421 0.0352 0.0380
13:01-14:00, Fri., 15 Jun. 0.0397 0.0317 0.0354
12:01-13:00, Fri., 15 Jun. 0.0359 0.0309 0.0332
11:01-12:00, Fri., 15 Jun. 0.0371 0.0324 0.0345
10:01-11:00, Fri., 15 Jun. 0.0353 0.0279 0.0313
09:01-10:00, Fri., 15 Jun. 0.0331 0.0283 0.0302
08:01-09:00, Fri., 15 Jun. 0.0314 0.0286 0.0300
07:01-08:00, Fri., 15 Jun. 0.0328 0.0279 0.0303
06:01-07:00, Fri., 15 Jun. 0.0316 0.0285 0.0300
05:01-06:00, Fri., 15 Jun. 0.0313 0.0285 0.0300
04:01-05:00, Fri., 15 Jun. 0.0318 0.0280 0.0298
03:01-04:00, Fri., 15 Jun. 0.0317 0.0281 0.0299
02:01-03:00, Fri., 15 Jun. 0.0320 0.0281 0.0299
01:01-02:00, Fri., 15 Jun. 0.0329 0.0285 0.0302
00:01-01:00, Fri., 15 Jun. 0.0324 0.0286 0.0303
23:01-24:00, Thu., 14 Jun. 0.0321 0.0284 0.0304
22:01-23:00, Thu., 14 Jun. 0.0315 0.0281 0.0302
21:01-22:00, Thu., 14 Jun. 0.0320 0.0283 0.0302
20:01-21:00, Thu., 14 Jun. 0.0321 0.0282 0.0301
19:01-20:00, Thu., 14 Jun. 0.0316 0.0281 0.0299
18:01-19:00, Thu., 14 Jun. 0.0320 0.0285 0.0303
17:01-18:00, Thu., 14 Jun. 0.0321 0.0281 0.0300
16:01-17:00, Thu., 14 Jun. 0.0323 0.0282 0.0304
15:01-16:00, Thu., 14 Jun. 0.0326 0.0279 0.0301
14:01-15:00, Thu., 14 Jun. 0.0320 0.0283 0.0301
13:01-14:00, Thu., 14 Jun. 0.0331 0.0276 0.0302
12:01-13:00, Thu., 14 Jun. 0.0318 0.0276 0.0298
11:01-12:00, Thu., 14 Jun. 0.0323 0.0284 0.0301
10:01-11:00, Thu., 14 Jun. 0.0326 0.0284 0.0303
09:01-10:00, Thu., 14 Jun. 0.0325 0.0286 0.0301
08:01-09:00, Thu., 14 Jun. 0.0322 0.0276 0.0300
07:01-08:00, Thu., 14 Jun. 0.0318 0.0285 0.0302
06:01-07:00, Thu., 14 Jun. 0.0339 0.0277 0.0301
05:01-06:00, Thu., 14 Jun. 0.0309 0.0272 0.0290
04:01-05:00, Thu., 14 Jun. 0.0310 0.0263 0.0288
03:01-04:00, Thu., 14 Jun. 0.0314 0.0275 0.0291
02:01-03:00, Thu., 14 Jun. 0.0309 0.0272 0.0290
01:01-02:00, Thu., 14 Jun. 0.0309 0.0272 0.0290
00:01-01:00, Thu., 14 Jun. 0.0304 0.0271 0.0289
23:01-24:00, Wed., 13 Jun. 0.0309 0.0273 0.0287
22:01-23:00, Wed., 13 Jun. 0.0304 0.0272 0.0290
21:01-22:00, Wed., 13 Jun. 0.0307 0.0262 0.0288
20:01-21:00, Wed., 13 Jun. 0.0308 0.0272 0.0289
19:01-20:00, Wed., 13 Jun. 0.0306 0.0264 0.0287
18:01-19:00, Wed., 13 Jun. 0.0311 0.0267 0.0289
17:01-18:00, Wed., 13 Jun. 0.0301 0.0269 0.0287
16:01-17:00, Wed., 13 Jun. 0.0321 0.0266 0.0294
15:01-16:00, Wed., 13 Jun. 0.0320 0.0282 0.0302
14:01-15:00, Wed., 13 Jun. 0.0320 0.0284 0.0301
13:01-14:00, Wed., 13 Jun. 0.0319 0.0274 0.0302
12:01-13:00, Wed., 13 Jun. 0.0321 0.0279 0.0300
11:01-12:00, Wed., 13 Jun. 0.0323 0.0278 0.0302
10:01-11:00, Wed., 13 Jun. 0.0321 0.0283 0.0300
09:01-10:00, Wed., 13 Jun. 0.0320 0.0283 0.0301