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
19:01-20:00, Sun., 24 Jun. 0.0332 0.0278 0.0303
18:01-19:00, Sun., 24 Jun. 0.0322 0.0280 0.0303
17:01-18:00, Sun., 24 Jun. 0.0325 0.0290 0.0305
16:01-17:00, Sun., 24 Jun. 0.0325 0.0289 0.0305
15:01-16:00, Sun., 24 Jun. 0.0322 0.0275 0.0303
14:01-15:00, Sun., 24 Jun. 0.0321 0.0279 0.0301
13:01-14:00, Sun., 24 Jun. 0.0320 0.0281 0.0302
12:01-13:00, Sun., 24 Jun. 0.0329 0.0287 0.0308
11:01-12:00, Sun., 24 Jun. 0.0343 0.0288 0.0310
10:01-11:00, Sun., 24 Jun. 0.0338 0.0298 0.0315
09:01-10:00, Sun., 24 Jun. 0.0374 0.0311 0.0335
08:01-09:00, Sun., 24 Jun. 0.0384 0.0304 0.0346
07:01-08:00, Sun., 24 Jun. 0.0344 0.0298 0.0319
06:01-07:00, Sun., 24 Jun. 0.0363 0.0316 0.0338
05:01-06:00, Sun., 24 Jun. 0.0351 0.0297 0.0320
04:01-05:00, Sun., 24 Jun. 0.0330 0.0292 0.0309
03:01-04:00, Sun., 24 Jun. 0.0337 0.0287 0.0306
02:01-03:00, Sun., 24 Jun. 0.0325 0.0285 0.0304
01:01-02:00, Sun., 24 Jun. 0.0316 0.0283 0.0300
00:01-01:00, Sun., 24 Jun. 0.0328 0.0282 0.0299
23:01-24:00, Sat., 23 Jun. 0.0321 0.0278 0.0300
22:01-23:00, Sat., 23 Jun. 0.0331 0.0289 0.0304
21:01-22:00, Sat., 23 Jun. 0.0327 0.0281 0.0303
20:01-21:00, Sat., 23 Jun. 0.0340 0.0290 0.0314
19:01-20:00, Sat., 23 Jun. 0.0416 0.0320 0.0357
18:01-19:00, Sat., 23 Jun. 0.0528 0.0373 0.0466
17:01-18:00, Sat., 23 Jun. 0.0548 0.0427 0.0488
16:01-17:00, Sat., 23 Jun. 0.0470 0.0369 0.0416
15:01-16:00, Sat., 23 Jun. 0.0424 0.0350 0.0378
14:01-15:00, Sat., 23 Jun. 0.0383 0.0309 0.0334
13:01-14:00, Sat., 23 Jun. 0.0346 0.0299 0.0325
12:01-13:00, Sat., 23 Jun. 0.0343 0.0298 0.0316
11:01-12:00, Sat., 23 Jun. 0.0324 0.0291 0.0309
10:01-11:00, Sat., 23 Jun. 0.0327 0.0296 0.0310
09:01-10:00, Sat., 23 Jun. 0.0334 0.0290 0.0308
08:01-09:00, Sat., 23 Jun. 0.0337 0.0290 0.0310
07:01-08:00, Sat., 23 Jun. 0.0330 0.0291 0.0307
06:01-07:00, Sat., 23 Jun. 0.0325 0.0283 0.0306
05:01-06:00, Sat., 23 Jun. 0.0319 0.0285 0.0303
04:01-05:00, Sat., 23 Jun. 0.0328 0.0289 0.0307
03:01-04:00, Sat., 23 Jun. 0.0324 0.0288 0.0306
02:01-03:00, Sat., 23 Jun. 0.0330 0.0288 0.0307
01:01-02:00, Sat., 23 Jun. 0.0334 0.0291 0.0311
00:01-01:00, Sat., 23 Jun. 0.0327 0.0287 0.0310
23:01-24:00, Fri., 22 Jun. 0.0331 0.0288 0.0308
22:01-23:00, Fri., 22 Jun. 0.0322 0.0289 0.0305
21:01-22:00, Fri., 22 Jun. 0.0335 0.0290 0.0308
20:01-21:00, Fri., 22 Jun. 0.0336 0.0279 0.0306
19:01-20:00, Fri., 22 Jun. 0.0324 0.0288 0.0302
18:01-19:00, Fri., 22 Jun. 0.0326 0.0281 0.0304
17:01-18:00, Fri., 22 Jun. 0.0325 0.0276 0.0302
16:01-17:00, Fri., 22 Jun. 0.0321 0.0285 0.0304
15:01-16:00, Fri., 22 Jun. 0.0324 0.0269 0.0304
14:01-15:00, Fri., 22 Jun. 0.0326 0.0285 0.0303
13:01-14:00, Fri., 22 Jun. 0.0334 0.0281 0.0306
12:01-13:00, Fri., 22 Jun. 0.0327 0.0289 0.0305
11:01-12:00, Fri., 22 Jun. 0.0322 0.0280 0.0304
10:01-11:00, Fri., 22 Jun. 0.0325 0.0281 0.0303
09:01-10:00, Fri., 22 Jun. 0.0328 0.0288 0.0306
08:01-09:00, Fri., 22 Jun. 0.0329 0.0283 0.0308
07:01-08:00, Fri., 22 Jun. 0.0330 0.0290 0.0311
06:01-07:00, Fri., 22 Jun. 0.0344 0.0295 0.0319
05:01-06:00, Fri., 22 Jun. 0.0347 0.0308 0.0326
04:01-05:00, Fri., 22 Jun. 0.0339 0.0297 0.0320
03:01-04:00, Fri., 22 Jun. 0.0349 0.0294 0.0322
02:01-03:00, Fri., 22 Jun. 0.0335 0.0289 0.0310
01:01-02:00, Fri., 22 Jun. 0.0332 0.0288 0.0306
00:01-01:00, Fri., 22 Jun. 0.0321 0.0281 0.0299
23:01-24:00, Thu., 21 Jun. 0.0319 0.0284 0.0300
22:01-23:00, Thu., 21 Jun. 0.0318 0.0277 0.0299
21:01-22:00, Thu., 21 Jun. 0.0320 0.0281 0.0299
20:01-21:00, Thu., 21 Jun. 0.0324 0.0280 0.0300
19:01-20:00, Thu., 21 Jun. 0.0320 0.0279 0.0301
18:01-19:00, Thu., 21 Jun. 0.0327 0.0278 0.0302
17:01-18:00, Thu., 21 Jun. 0.0315 0.0281 0.0297
16:01-17:00, Thu., 21 Jun. 0.0323 0.0283 0.0301
15:01-16:00, Thu., 21 Jun. 0.0313 0.0276 0.0299
14:01-15:00, Thu., 21 Jun. 0.0311 0.0281 0.0296
13:01-14:00, Thu., 21 Jun. 0.0317 0.0274 0.0297
12:01-13:00, Thu., 21 Jun. 0.0320 0.0278 0.0299
11:01-12:00, Thu., 21 Jun. 0.0329 0.0278 0.0299
10:01-11:00, Thu., 21 Jun. 0.0319 0.0274 0.0297
09:01-10:00, Thu., 21 Jun. 0.0324 0.0282 0.0299
08:01-09:00, Thu., 21 Jun. 0.0318 0.0280 0.0299
07:01-08:00, Thu., 21 Jun. 0.0328 0.0271 0.0300
06:01-07:00, Thu., 21 Jun. 0.0331 0.0278 0.0300
05:01-06:00, Thu., 21 Jun. 0.0324 0.0287 0.0305
04:01-05:00, Thu., 21 Jun. 0.0346 0.0300 0.0321
03:01-04:00, Thu., 21 Jun. 0.0342 0.0299 0.0320
02:01-03:00, Thu., 21 Jun. 0.0346 0.0293 0.0318
01:01-02:00, Thu., 21 Jun. 0.0321 0.0290 0.0304
00:01-01:00, Thu., 21 Jun. 0.0335 0.0287 0.0313
23:01-24:00, Wed., 20 Jun. 0.0399 0.0319 0.0355
22:01-23:00, Wed., 20 Jun. 0.0427 0.0346 0.0383
21:01-22:00, Wed., 20 Jun. 0.0364 0.0305 0.0332
20:01-21:00, Wed., 20 Jun. 0.0358 0.0306 0.0331
19:01-20:00, Wed., 20 Jun. 0.0364 0.0311 0.0336
18:01-19:00, Wed., 20 Jun. 0.0327 0.0280 0.0301
17:01-18:00, Wed., 20 Jun. 0.0325 0.0276 0.0297
16:01-17:00, Wed., 20 Jun. 0.0323 0.0279 0.0297
15:01-16:00, Wed., 20 Jun. 0.0328 0.0284 0.0303
14:01-15:00, Wed., 20 Jun. 0.0329 0.0284 0.0309
13:01-14:00, Wed., 20 Jun. 0.0333 0.0297 0.0314
12:01-13:00, Wed., 20 Jun. 0.0349 0.0299 0.0328
11:01-12:00, Wed., 20 Jun. 0.0405 0.0336 0.0364
10:01-11:00, Wed., 20 Jun. 0.0397 0.0329 0.0359
09:01-10:00, Wed., 20 Jun. 0.0369 0.0329 0.0345
08:01-09:00, Wed., 20 Jun. 0.0391 0.0340 0.0358
07:01-08:00, Wed., 20 Jun. 0.0369 0.0319 0.0343
06:01-07:00, Wed., 20 Jun. 0.0346 0.0295 0.0316
05:01-06:00, Wed., 20 Jun. 0.0350 0.0300 0.0331
04:01-05:00, Wed., 20 Jun. 0.0363 0.0319 0.0336
03:01-04:00, Wed., 20 Jun. 0.0335 0.0296 0.0316
02:01-03:00, Wed., 20 Jun. 0.0333 0.0288 0.0313
01:01-02:00, Wed., 20 Jun. 0.0331 0.0287 0.0305
00:01-01:00, Wed., 20 Jun. 0.0331 0.0284 0.0300
23:01-24:00, Tue., 19 Jun. 0.0318 0.0283 0.0299
22:01-23:00, Tue., 19 Jun. 0.0311 0.0276 0.0297
21:01-22:00, Tue., 19 Jun. 0.0325 0.0281 0.0300
20:01-21:00, Tue., 19 Jun. 0.0322 0.0280 0.0298
19:01-20:00, Tue., 19 Jun. 0.0315 0.0281 0.0299
18:01-19:00, Tue., 19 Jun. 0.0323 0.0271 0.0298
17:01-18:00, Tue., 19 Jun. 0.0323 0.0277 0.0299
16:01-17:00, Tue., 19 Jun. 0.0323 0.0282 0.0302
15:01-16:00, Tue., 19 Jun. 0.0314 0.0276 0.0297
14:01-15:00, Tue., 19 Jun. 0.0325 0.0277 0.0300
13:01-14:00, Tue., 19 Jun. 0.0328 0.0280 0.0300
12:01-13:00, Tue., 19 Jun. 0.0317 0.0282 0.0299
11:01-12:00, Tue., 19 Jun. 0.0314 0.0279 0.0295
10:01-11:00, Tue., 19 Jun. 0.0325 0.0282 0.0299
09:01-10:00, Tue., 19 Jun. 0.0332 0.0280 0.0303
08:01-09:00, Tue., 19 Jun. 0.0325 0.0282 0.0302
07:01-08:00, Tue., 19 Jun. 0.0320 0.0276 0.0304
06:01-07:00, Tue., 19 Jun. 0.0327 0.0286 0.0308
05:01-06:00, Tue., 19 Jun. 0.0326 0.0279 0.0305
04:01-05:00, Tue., 19 Jun. 0.0325 0.0285 0.0306
03:01-04:00, Tue., 19 Jun. 0.0319 0.0284 0.0303
02:01-03:00, Tue., 19 Jun. 0.0324 0.0284 0.0303
01:01-02:00, Tue., 19 Jun. 0.0322 0.0288 0.0303
00:01-01:00, Tue., 19 Jun. 0.0323 0.0280 0.0303
23:01-24:00, Mon., 18 Jun. 0.0330 0.0284 0.0307
22:01-23:00, Mon., 18 Jun. 0.0325 0.0285 0.0306
21:01-22:00, Mon., 18 Jun. 0.0320 0.0279 0.0298
20:01-21:00, Mon., 18 Jun. 0.0313 0.0285 0.0301
19:01-20:00, Mon., 18 Jun. 0.0321 0.0283 0.0301
18:01-19:00, Mon., 18 Jun. 0.0338 0.0279 0.0303
17:01-18:00, Mon., 18 Jun. 0.0329 0.0283 0.0298
16:01-17:00, Mon., 18 Jun. 0.0329 0.0282 0.0304
15:01-16:00, Mon., 18 Jun. 0.0329 0.0289 0.0309
14:01-15:00, Mon., 18 Jun. 0.0331 0.0288 0.0309
13:01-14:00, Mon., 18 Jun. 0.0320 0.0283 0.0300
12:01-13:00, Mon., 18 Jun. 0.0323 0.0282 0.0302
11:01-12:00, Mon., 18 Jun. 0.0338 0.0289 0.0306
10:01-11:00, Mon., 18 Jun. 0.0329 0.0279 0.0307
09:01-10:00, Mon., 18 Jun. 0.0329 0.0279 0.0302
08:01-09:00, Mon., 18 Jun. 0.0326 0.0290 0.0306
07:01-08:00, Mon., 18 Jun. 0.0331 0.0287 0.0306
06:01-07:00, Mon., 18 Jun. 0.0323 0.0273 0.0304
05:01-06:00, Mon., 18 Jun. 0.0326 0.0287 0.0304
04:01-05:00, Mon., 18 Jun. 0.0326 0.0284 0.0303
03:01-04:00, Mon., 18 Jun. 0.0328 0.0289 0.0307
02:01-03:00, Mon., 18 Jun. 0.0329 0.0291 0.0307
01:01-02:00, Mon., 18 Jun. 0.0333 0.0280 0.0307
00:01-01:00, Mon., 18 Jun. 0.0328 0.0287 0.0305
23:01-24:00, Sun., 17 Jun. 0.0323 0.0287 0.0303
22:01-23:00, Sun., 17 Jun. 0.0318 0.0278 0.0299
21:01-22:00, Sun., 17 Jun. 0.0312 0.0273 0.0292
20:01-21:00, Sun., 17 Jun. 0.0315 0.0273 0.0294
19:01-20:00, Sun., 17 Jun. 0.0329 0.0281 0.0295
18:01-19:00, Sun., 17 Jun. 0.0315 0.0277 0.0296
17:01-18:00, Sun., 17 Jun. 0.0320 0.0280 0.0297
16:01-17:00, Sun., 17 Jun. 0.0319 0.0276 0.0296
15:01-16:00, Sun., 17 Jun. 0.0310 0.0274 0.0294
14:01-15:00, Sun., 17 Jun. 0.0311 0.0273 0.0293
13:01-14:00, Sun., 17 Jun. 0.0316 0.0273 0.0296
12:01-13:00, Sun., 17 Jun. 0.0314 0.0277 0.0294
11:01-12:00, Sun., 17 Jun. 0.0308 0.0278 0.0294
10:01-11:00, Sun., 17 Jun. 0.0323 0.0272 0.0296
09:01-10:00, Sun., 17 Jun. 0.0315 0.0277 0.0295
08:01-09:00, Sun., 17 Jun. 0.0308 0.0273 0.0295
07:01-08:00, Sun., 17 Jun. 0.0317 0.0277 0.0296
06:01-07:00, Sun., 17 Jun. 0.0326 0.0276 0.0297
05:01-06:00, Sun., 17 Jun. 0.0317 0.0274 0.0296
04:01-05:00, Sun., 17 Jun. 0.0321 0.0277 0.0295
03:01-04:00, Sun., 17 Jun. 0.0315 0.0282 0.0300
02:01-03:00, Sun., 17 Jun. 0.0323 0.0275 0.0299
01:01-02:00, Sun., 17 Jun. 0.0319 0.0280 0.0297
00:01-01:00, Sun., 17 Jun. 0.0316 0.0274 0.0296
23:01-24:00, Sat., 16 Jun. 0.0319 0.0279 0.0296
22:01-23:00, Sat., 16 Jun. 0.0310 0.0275 0.0294
21:01-22:00, Sat., 16 Jun. 0.0317 0.0275 0.0295
20:01-21:00, Sat., 16 Jun. 0.0311 0.0272 0.0295
19:01-20:00, Sat., 16 Jun. 0.0329 0.0280 0.0299
18:01-19:00, Sat., 16 Jun. 0.0322 0.0284 0.0301
17:01-18:00, Sat., 16 Jun. 0.0316 0.0275 0.0297
16:01-17:00, Sat., 16 Jun. 0.0315 0.0274 0.0293
15:01-16:00, Sat., 16 Jun. 0.0311 0.0267 0.0293
14:01-15:00, Sat., 16 Jun. 0.0320 0.0272 0.0293
13:01-14:00, Sat., 16 Jun. 0.0314 0.0271 0.0293
12:01-13:00, Sat., 16 Jun. 0.0318 0.0278 0.0295
11:01-12:00, Sat., 16 Jun. 0.0318 0.0275 0.0297
10:01-11:00, Sat., 16 Jun. 0.0331 0.0288 0.0307
09:01-10:00, Sat., 16 Jun. 0.0340 0.0292 0.0313
08:01-09:00, Sat., 16 Jun. 0.0332 0.0283 0.0305
07:01-08:00, Sat., 16 Jun. 0.0324 0.0283 0.0302
06:01-07:00, Sat., 16 Jun. 0.0323 0.0284 0.0306
05:01-06:00, Sat., 16 Jun. 0.0333 0.0289 0.0307
04:01-05:00, Sat., 16 Jun. 0.0346 0.0288 0.0316
03:01-04:00, Sat., 16 Jun. 0.0343 0.0284 0.0315
02:01-03:00, Sat., 16 Jun. 0.0322 0.0278 0.0299
01:01-02:00, Sat., 16 Jun. 0.0318 0.0280 0.0303
00:01-01:00, Sat., 16 Jun. 0.0320 0.0281 0.0300
23:01-24:00, Fri., 15 Jun. 0.0325 0.0285 0.0302
22:01-23:00, Fri., 15 Jun. 0.0314 0.0282 0.0301
21:01-22:00, Fri., 15 Jun. 0.0316 0.0280 0.0300
20:01-21:00, Fri., 15 Jun. 0.0337 0.0291 0.0310
19:01-20:00, Fri., 15 Jun. 0.0342 0.0298 0.0319
18:01-19:00, Fri., 15 Jun. 0.0346 0.0307 0.0329
17:01-18:00, Fri., 15 Jun. 0.0362 0.0314 0.0334
16:01-17:00, Fri., 15 Jun. 0.0355 0.0320 0.0340
15:01-16:00, Fri., 15 Jun. 0.0356 0.0317 0.0338
14:01-15:00, Fri., 15 Jun. 0.0373 0.0326 0.0346
13:01-14:00, Fri., 15 Jun. 0.0392 0.0341 0.0359
12:01-13:00, Fri., 15 Jun. 0.0360 0.0299 0.0325
11:01-12:00, Fri., 15 Jun. 0.0326 0.0288 0.0306
10:01-11:00, Fri., 15 Jun. 0.0318 0.0279 0.0298
09:01-10:00, Fri., 15 Jun. 0.0317 0.0279 0.0300
08:01-09:00, Fri., 15 Jun. 0.0316 0.0285 0.0301
07:01-08:00, Fri., 15 Jun. 0.0321 0.0280 0.0298
06:01-07:00, Fri., 15 Jun. 0.0314 0.0279 0.0299
05:01-06:00, Fri., 15 Jun. 0.0315 0.0279 0.0300
04:01-05:00, Fri., 15 Jun. 0.0321 0.0272 0.0302
03:01-04:00, Fri., 15 Jun. 0.0330 0.0286 0.0308
02:01-03:00, Fri., 15 Jun. 0.0328 0.0285 0.0310
01:01-02:00, Fri., 15 Jun. 0.0328 0.0286 0.0310
00:01-01:00, Fri., 15 Jun. 0.0323 0.0279 0.0302
23:01-24:00, Thu., 14 Jun. 0.0325 0.0286 0.0305
22:01-23:00, Thu., 14 Jun. 0.0315 0.0282 0.0297
21:01-22:00, Thu., 14 Jun. 0.0319 0.0278 0.0298
20:01-21:00, Thu., 14 Jun. 0.0323 0.0279 0.0296