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

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. 0.0396 0.0350 0.0368
19:01-20:00, Thu., 20 Sep. 0.0403 0.0344 0.0373
18:01-19:00, Thu., 20 Sep. 0.0431 0.0362 0.0385
17:01-18:00, Thu., 20 Sep. 0.0465 0.0380 0.0412
16:01-17:00, Thu., 20 Sep. 0.0466 0.0407 0.0433
15:01-16:00, Thu., 20 Sep. 0.0442 0.0343 0.0384
14:01-15:00, Thu., 20 Sep. 0.0364 0.0302 0.0334
13:01-14:00, Thu., 20 Sep. 0.0330 0.0291 0.0311
12:01-13:00, Thu., 20 Sep. 0.0332 0.0287 0.0305
11:01-12:00, Thu., 20 Sep. 0.0323 0.0284 0.0302
10:01-11:00, Thu., 20 Sep. 0.0323 0.0291 0.0308
09:01-10:00, Thu., 20 Sep. 0.0333 0.0291 0.0309
08:01-09:00, Thu., 20 Sep. 0.0328 0.0285 0.0304
07:01-08:00, Thu., 20 Sep. 0.0325 0.0285 0.0305
06:01-07:00, Thu., 20 Sep. 0.0324 0.0287 0.0305
05:01-06:00, Thu., 20 Sep. 0.0330 0.0276 0.0305
04:01-05:00, Thu., 20 Sep. 0.0326 0.0277 0.0305
03:01-04:00, Thu., 20 Sep. 0.0334 0.0285 0.0303
02:01-03:00, Thu., 20 Sep. 0.0335 0.0290 0.0313
01:01-02:00, Thu., 20 Sep. 0.0334 0.0290 0.0309
00:01-01:00, Thu., 20 Sep. 0.0324 0.0287 0.0306
23:01-24:00, Wed., 19 Sep. 0.0319 0.0275 0.0299
22:01-23:00, Wed., 19 Sep. 0.0320 0.0281 0.0301
21:01-22:00, Wed., 19 Sep. 0.0318 0.0284 0.0301
20:01-21:00, Wed., 19 Sep. 0.0315 0.0285 0.0302
19:01-20:00, Wed., 19 Sep. 0.0321 0.0279 0.0303
18:01-19:00, Wed., 19 Sep. 0.0326 0.0284 0.0300
17:01-18:00, Wed., 19 Sep. 0.0325 0.0280 0.0300
16:01-17:00, Wed., 19 Sep. 0.0324 0.0283 0.0301
15:01-16:00, Wed., 19 Sep. 0.0323 0.0283 0.0300
14:01-15:00, Wed., 19 Sep. 0.0322 0.0277 0.0300
13:01-14:00, Wed., 19 Sep. 0.0323 0.0290 0.0302
12:01-13:00, Wed., 19 Sep. 0.0321 0.0277 0.0301
11:01-12:00, Wed., 19 Sep. 0.0329 0.0281 0.0302
10:01-11:00, Wed., 19 Sep. 0.0322 0.0277 0.0301
09:01-10:00, Wed., 19 Sep. 0.0321 0.0282 0.0301
08:01-09:00, Wed., 19 Sep. 0.0325 0.0280 0.0300
07:01-08:00, Wed., 19 Sep. 0.0318 0.0280 0.0299
06:01-07:00, Wed., 19 Sep. 0.0326 0.0277 0.0304
05:01-06:00, Wed., 19 Sep. 0.0334 0.0289 0.0314
04:01-05:00, Wed., 19 Sep. 0.0361 0.0307 0.0334
03:01-04:00, Wed., 19 Sep. 0.0349 0.0299 0.0323
02:01-03:00, Wed., 19 Sep. 0.0330 0.0294 0.0312
01:01-02:00, Wed., 19 Sep. 0.0316 0.0279 0.0297
00:01-01:00, Wed., 19 Sep. 0.0317 0.0276 0.0299
23:01-24:00, Tue., 18 Sep. 0.0323 0.0278 0.0297
22:01-23:00, Tue., 18 Sep. 0.0321 0.0275 0.0298
21:01-22:00, Tue., 18 Sep. 0.0338 0.0285 0.0310
20:01-21:00, Tue., 18 Sep. 0.0351 0.0302 0.0330
19:01-20:00, Tue., 18 Sep. 0.0346 0.0272 0.0302
18:01-19:00, Tue., 18 Sep. 0.0312 0.0277 0.0295
17:01-18:00, Tue., 18 Sep. 0.0312 0.0279 0.0295
16:01-17:00, Tue., 18 Sep. 0.0318 0.0276 0.0295
15:01-16:00, Tue., 18 Sep. 0.0318 0.0278 0.0297
14:01-15:00, Tue., 18 Sep. 0.0318 0.0280 0.0297
13:01-14:00, Tue., 18 Sep. 0.0317 0.0278 0.0295
12:01-13:00, Tue., 18 Sep. 0.0319 0.0258 0.0298
11:01-12:00, Tue., 18 Sep. 0.0319 0.0278 0.0295
10:01-11:00, Tue., 18 Sep. 0.0324 0.0286 0.0299
09:01-10:00, Tue., 18 Sep. 0.0322 0.0273 0.0300
08:01-09:00, Tue., 18 Sep. 0.0321 0.0283 0.0302
07:01-08:00, Tue., 18 Sep. 0.0319 0.0275 0.0301
06:01-07:00, Tue., 18 Sep. 0.0320 0.0278 0.0301
05:01-06:00, Tue., 18 Sep. 0.0316 0.0281 0.0296
04:01-05:00, Tue., 18 Sep. 0.0320 0.0276 0.0295
03:01-04:00, Tue., 18 Sep. 0.0318 0.0272 0.0296
02:01-03:00, Tue., 18 Sep. 0.0322 0.0287 0.0300
01:01-02:00, Tue., 18 Sep. 0.0320 0.0268 0.0299
00:01-01:00, Tue., 18 Sep. 0.0319 0.0283 0.0299
23:01-24:00, Mon., 17 Sep. 0.0319 0.0285 0.0299
22:01-23:00, Mon., 17 Sep. 0.0321 0.0279 0.0299
21:01-22:00, Mon., 17 Sep. 0.0321 0.0283 0.0302
20:01-21:00, Mon., 17 Sep. 0.0341 0.0289 0.0316
19:01-20:00, Mon., 17 Sep. 0.0373 0.0312 0.0343
18:01-19:00, Mon., 17 Sep. 0.0349 0.0279 0.0307
17:01-18:00, Mon., 17 Sep. 0.0318 0.0282 0.0300
16:01-17:00, Mon., 17 Sep. 0.0317 0.0285 0.0302
15:01-16:00, Mon., 17 Sep. 0.0327 0.0286 0.0304
14:01-15:00, Mon., 17 Sep. 0.0330 0.0281 0.0303
13:01-14:00, Mon., 17 Sep. 0.0315 0.0283 0.0298
12:01-13:00, Mon., 17 Sep. 0.0321 0.0276 0.0300
11:01-12:00, Mon., 17 Sep. 0.0327 0.0286 0.0307
10:01-11:00, Mon., 17 Sep. 0.0336 0.0289 0.0306
09:01-10:00, Mon., 17 Sep. 0.0322 0.0277 0.0306
08:01-09:00, Mon., 17 Sep. 0.0333 0.0289 0.0312
07:01-08:00, Mon., 17 Sep. 0.0337 0.0296 0.0319
06:01-07:00, Mon., 17 Sep. 0.0345 0.0301 0.0321
05:01-06:00, Mon., 17 Sep. 0.0336 0.0286 0.0309
04:01-05:00, Mon., 17 Sep. 0.0335 0.0293 0.0312
03:01-04:00, Mon., 17 Sep. 0.0328 0.0287 0.0311
02:01-03:00, Mon., 17 Sep. 0.0333 0.0280 0.0305
01:01-02:00, Mon., 17 Sep. 0.0327 0.0281 0.0299
00:01-01:00, Mon., 17 Sep. 0.0312 0.0275 0.0294
23:01-24:00, Sun., 16 Sep. 0.0317 0.0277 0.0297
22:01-23:00, Sun., 16 Sep. 0.0314 0.0277 0.0294
21:01-22:00, Sun., 16 Sep. 0.0321 0.0279 0.0297
20:01-21:00, Sun., 16 Sep. 0.0319 0.0275 0.0296
19:01-20:00, Sun., 16 Sep. 0.0313 0.0259 0.0293
18:01-19:00, Sun., 16 Sep. 0.0315 0.0272 0.0294
17:01-18:00, Sun., 16 Sep. 0.0318 0.0264 0.0295
16:01-17:00, Sun., 16 Sep. 0.0317 0.0277 0.0293
15:01-16:00, Sun., 16 Sep. 0.0317 0.0275 0.0295
14:01-15:00, Sun., 16 Sep. 0.0309 0.0275 0.0294
13:01-14:00, Sun., 16 Sep. 0.0327 0.0278 0.0296
12:01-13:00, Sun., 16 Sep. 0.0305 0.0268 0.0294
11:01-12:00, Sun., 16 Sep. 0.0310 0.0277 0.0292
10:01-11:00, Sun., 16 Sep. 0.0312 0.0269 0.0297
09:01-10:00, Sun., 16 Sep. 0.0319 0.0278 0.0298
08:01-09:00, Sun., 16 Sep. 0.0320 0.0278 0.0301
07:01-08:00, Sun., 16 Sep. 0.0327 0.0280 0.0297
06:01-07:00, Sun., 16 Sep. 0.0314 0.0281 0.0296
05:01-06:00, Sun., 16 Sep. 0.0318 0.0274 0.0297
04:01-05:00, Sun., 16 Sep. 0.0318 0.0273 0.0298
03:01-04:00, Sun., 16 Sep. 0.0319 0.0277 0.0298
02:01-03:00, Sun., 16 Sep. 0.0326 0.0281 0.0300
01:01-02:00, Sun., 16 Sep. 0.0310 0.0279 0.0296
00:01-01:00, Sun., 16 Sep. 0.0313 0.0277 0.0297
23:01-24:00, Sat., 15 Sep. 0.0324 0.0274 0.0297
22:01-23:00, Sat., 15 Sep. 0.0317 0.0278 0.0298
21:01-22:00, Sat., 15 Sep. 0.0328 0.0277 0.0299
20:01-21:00, Sat., 15 Sep. 0.0311 0.0272 0.0294
19:01-20:00, Sat., 15 Sep. 0.0311 0.0267 0.0290
18:01-19:00, Sat., 15 Sep. 0.0311 0.0275 0.0291
17:01-18:00, Sat., 15 Sep. 0.0305 0.0274 0.0289
16:01-17:00, Sat., 15 Sep. 0.0304 0.0270 0.0290
15:01-16:00, Sat., 15 Sep. 0.0310 0.0272 0.0293
14:01-15:00, Sat., 15 Sep. 0.0330 0.0277 0.0302
13:01-14:00, Sat., 15 Sep. 0.0331 0.0298 0.0313
12:01-13:00, Sat., 15 Sep. 0.0344 0.0305 0.0326
11:01-12:00, Sat., 15 Sep. 0.0361 0.0307 0.0334
10:01-11:00, Sat., 15 Sep. 0.0366 0.0308 0.0334
09:01-10:00, Sat., 15 Sep. 0.0359 0.0297 0.0334
08:01-09:00, Sat., 15 Sep. 0.0369 0.0309 0.0337
07:01-08:00, Sat., 15 Sep. 0.0368 0.0287 0.0334
06:01-07:00, Sat., 15 Sep. 0.0320 0.0283 0.0300
05:01-06:00, Sat., 15 Sep. 0.0323 0.0273 0.0294
04:01-05:00, Sat., 15 Sep. 0.0317 0.0279 0.0298
03:01-04:00, Sat., 15 Sep. 0.0320 0.0279 0.0298
02:01-03:00, Sat., 15 Sep. 0.0337 0.0269 0.0312
01:01-02:00, Sat., 15 Sep. 0.0350 0.0299 0.0323
00:01-01:00, Sat., 15 Sep. 0.0334 0.0294 0.0312
23:01-24:00, Fri., 14 Sep. 0.0339 0.0291 0.0311
22:01-23:00, Fri., 14 Sep. 0.0320 0.0288 0.0301
21:01-22:00, Fri., 14 Sep. 0.0318 0.0280 0.0300
20:01-21:00, Fri., 14 Sep. 0.0314 0.0274 0.0290
19:01-20:00, Fri., 14 Sep. 0.0312 0.0268 0.0290
18:01-19:00, Fri., 14 Sep. 0.0313 0.0266 0.0292
17:01-18:00, Fri., 14 Sep. 0.0315 0.0265 0.0290
16:01-17:00, Fri., 14 Sep. 0.0308 0.0266 0.0287
15:01-16:00, Fri., 14 Sep. 0.0314 0.0271 0.0292
14:01-15:00, Fri., 14 Sep. 0.0316 0.0274 0.0293
13:01-14:00, Fri., 14 Sep. 0.0331 0.0285 0.0306
12:01-13:00, Fri., 14 Sep. 0.0318 0.0274 0.0298
11:01-12:00, Fri., 14 Sep. 0.0315 0.0278 0.0294
10:01-11:00, Fri., 14 Sep. 0.0322 0.0273 0.0300
09:01-10:00, Fri., 14 Sep. 0.0333 0.0296 0.0314
08:01-09:00, Fri., 14 Sep. 0.0345 0.0299 0.0319
07:01-08:00, Fri., 14 Sep. 0.0345 0.0286 0.0322
06:01-07:00, Fri., 14 Sep. 0.0334 0.0283 0.0312
05:01-06:00, Fri., 14 Sep. 0.0326 0.0281 0.0298
04:01-05:00, Fri., 14 Sep. 0.0313 0.0271 0.0294
03:01-04:00, Fri., 14 Sep. 0.0323 0.0272 0.0300
02:01-03:00, Fri., 14 Sep. 0.0319 0.0283 0.0304
01:01-02:00, Fri., 14 Sep. 0.0331 0.0292 0.0312
00:01-01:00, Fri., 14 Sep. 0.0345 0.0296 0.0322
23:01-24:00, Thu., 13 Sep. 0.0354 0.0297 0.0322
22:01-23:00, Thu., 13 Sep. 0.0329 0.0295 0.0313
21:01-22:00, Thu., 13 Sep. 0.0357 0.0300 0.0327
20:01-21:00, Thu., 13 Sep. 0.0358 0.0292 0.0331
19:01-20:00, Thu., 13 Sep. 0.0313 0.0274 0.0295
18:01-19:00, Thu., 13 Sep. 0.0312 0.0278 0.0294
17:01-18:00, Thu., 13 Sep. 0.0313 0.0278 0.0294
16:01-17:00, Thu., 13 Sep. 0.0318 0.0268 0.0294
15:01-16:00, Thu., 13 Sep. 0.0316 0.0278 0.0294
14:01-15:00, Thu., 13 Sep. 0.0313 0.0280 0.0294
13:01-14:00, Thu., 13 Sep. 0.0322 0.0270 0.0293
12:01-13:00, Thu., 13 Sep. 0.0311 0.0274 0.0293
11:01-12:00, Thu., 13 Sep. 0.0317 0.0277 0.0294
10:01-11:00, Thu., 13 Sep. 0.0312 0.0266 0.0294
09:01-10:00, Thu., 13 Sep. 0.0323 0.0281 0.0297
08:01-09:00, Thu., 13 Sep. 0.0315 0.0281 0.0298
07:01-08:00, Thu., 13 Sep. 0.0319 0.0285 0.0301
06:01-07:00, Thu., 13 Sep. 0.0318 0.0274 0.0300
05:01-06:00, Thu., 13 Sep. 0.0320 0.0283 0.0300
04:01-05:00, Thu., 13 Sep. 0.0326 0.0274 0.0303
03:01-04:00, Thu., 13 Sep. 0.0318 0.0277 0.0299
02:01-03:00, Thu., 13 Sep. 0.0317 0.0276 0.0295
01:01-02:00, Thu., 13 Sep. 0.0310 0.0262 0.0295
00:01-01:00, Thu., 13 Sep. 0.0319 0.0272 0.0299
23:01-24:00, Wed., 12 Sep. 0.0314 0.0283 0.0298
22:01-23:00, Wed., 12 Sep. 0.0318 0.0278 0.0299
21:01-22:00, Wed., 12 Sep. 0.0322 0.0280 0.0297
20:01-21:00, Wed., 12 Sep. 0.0323 0.0277 0.0295
19:01-20:00, Wed., 12 Sep. 0.0312 0.0268 0.0293
18:01-19:00, Wed., 12 Sep. 0.0322 0.0272 0.0293
17:01-18:00, Wed., 12 Sep. 0.0318 0.0276 0.0295
16:01-17:00, Wed., 12 Sep. 0.0312 0.0279 0.0293
15:01-16:00, Wed., 12 Sep. 0.0315 0.0277 0.0293
14:01-15:00, Wed., 12 Sep. 0.0311 0.0267 0.0293
13:01-14:00, Wed., 12 Sep. 0.0322 0.0276 0.0293
12:01-13:00, Wed., 12 Sep. 0.0309 0.0274 0.0294
11:01-12:00, Wed., 12 Sep. 0.0317 0.0266 0.0293
10:01-11:00, Wed., 12 Sep. 0.0320 0.0278 0.0297
09:01-10:00, Wed., 12 Sep. 0.0314 0.0271 0.0294
08:01-09:00, Wed., 12 Sep. 0.0313 0.0267 0.0295
07:01-08:00, Wed., 12 Sep. 0.0321 0.0278 0.0296
06:01-07:00, Wed., 12 Sep. 0.0316 0.0273 0.0294
05:01-06:00, Wed., 12 Sep. 0.0312 0.0273 0.0294
04:01-05:00, Wed., 12 Sep. 0.0316 0.0270 0.0293
03:01-04:00, Wed., 12 Sep. 0.0309 0.0268 0.0294
02:01-03:00, Wed., 12 Sep. 0.0310 0.0271 0.0293
01:01-02:00, Wed., 12 Sep. 0.0308 0.0272 0.0292
00:01-01:00, Wed., 12 Sep. 0.0309 0.0273 0.0289
23:01-24:00, Tue., 11 Sep. 0.0308 0.0277 0.0291
22:01-23:00, Tue., 11 Sep. 0.0316 0.0271 0.0291
21:01-22:00, Tue., 11 Sep. 0.0307 0.0279 0.0292
20:01-21:00, Tue., 11 Sep. 0.0310 0.0266 0.0290
19:01-20:00, Tue., 11 Sep. 0.0310 0.0277 0.0292
18:01-19:00, Tue., 11 Sep. 0.0315 0.0264 0.0294
17:01-18:00, Tue., 11 Sep. 0.0312 0.0270 0.0291
16:01-17:00, Tue., 11 Sep. 0.0305 0.0277 0.0291
15:01-16:00, Tue., 11 Sep. 0.0312 0.0275 0.0293
14:01-15:00, Tue., 11 Sep. 0.0315 0.0275 0.0293
13:01-14:00, Tue., 11 Sep. 0.0319 0.0265 0.0292
12:01-13:00, Tue., 11 Sep. 0.0313 0.0279 0.0295
11:01-12:00, Tue., 11 Sep. 0.0316 0.0274 0.0298
10:01-11:00, Tue., 11 Sep. 0.0349 0.0290 0.0322
09:01-10:00, Tue., 11 Sep. 0.0372 0.0311 0.0344
08:01-09:00, Tue., 11 Sep. 0.0352 0.0275 0.0309
07:01-08:00, Tue., 11 Sep. 0.0314 0.0270 0.0296
06:01-07:00, Tue., 11 Sep. 0.0329 0.0284 0.0305
05:01-06:00, Tue., 11 Sep. 0.0365 0.0299 0.0329
04:01-05:00, Tue., 11 Sep. 0.0378 0.0334 0.0354
03:01-04:00, Tue., 11 Sep. 0.0368 0.0289 0.0331
02:01-03:00, Tue., 11 Sep. 0.0346 0.0298 0.0321
01:01-02:00, Tue., 11 Sep. 0.0384 0.0305 0.0347
00:01-01:00, Tue., 11 Sep. 0.0393 0.0351 0.0365
23:01-24:00, Mon., 10 Sep. 0.0399 0.0332 0.0354
22:01-23:00, Mon., 10 Sep. 0.0355 0.0313 0.0331
21:01-22:00, Mon., 10 Sep. 0.0341 0.0300 0.0323