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 10:00 to 13:00 on Tuesday, October 24,2017 Hachioji
From 13:00 to 16:00 on Tuesday, October 24,2017 Adachi
From 10:00 to 13:00 on Wednesday, October 25,2017 Chofu
From 13:00 to 16:00 on Wednesday, October 25,2017 Ota
From 10:00 to 13:00 on Thursday, October 26,2017 Kodaira
From 13:00 to 16:00 on Thursday, October 26,2017 Edogawa
From 10:00 to 13:00 on Friday, October 27,2017 Shinjuku

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 8:00 to 19:00 on Saturday, October 28,2017






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 8:00 to 12:00 on Monday, November 6,2017 

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
11:01-12:00, Mon., 11 Dec. 0.0334 0.0284 0.0313
10:01-11:00, Mon., 11 Dec. 0.0335 0.0292 0.0313
09:01-10:00, Mon., 11 Dec. 0.0343 0.0301 0.0319
08:01-09:00, Mon., 11 Dec. 0.0343 0.0306 0.0323
07:01-08:00, Mon., 11 Dec. 0.0340 0.0299 0.0318
06:01-07:00, Mon., 11 Dec. 0.0339 0.0299 0.0317
05:01-06:00, Mon., 11 Dec. 0.0344 0.0303 0.0320
04:01-05:00, Mon., 11 Dec. 0.0345 0.0299 0.0320
03:01-04:00, Mon., 11 Dec. 0.0352 0.0303 0.0323
02:01-03:00, Mon., 11 Dec. 0.0343 0.0299 0.0321
01:01-02:00, Mon., 11 Dec. 0.0337 0.0297 0.0319
00:01-01:00, Mon., 11 Dec. 0.0337 0.0291 0.0317
23:01-24:00, Sun., 10 Dec. 0.0338 0.0303 0.0319
22:01-23:00, Sun., 10 Dec. 0.0339 0.0299 0.0319
21:01-22:00, Sun., 10 Dec. 0.0334 0.0297 0.0316
20:01-21:00, Sun., 10 Dec. 0.0336 0.0287 0.0310
19:01-20:00, Sun., 10 Dec. 0.0327 0.0285 0.0310
18:01-19:00, Sun., 10 Dec. 0.0324 0.0287 0.0309
17:01-18:00, Sun., 10 Dec. 0.0323 0.0288 0.0307
16:01-17:00, Sun., 10 Dec. 0.0323 0.0289 0.0308
15:01-16:00, Sun., 10 Dec. 0.0324 0.0286 0.0304
14:01-15:00, Sun., 10 Dec. 0.0327 0.0288 0.0307
13:01-14:00, Sun., 10 Dec. 0.0334 0.0291 0.0310
12:01-13:00, Sun., 10 Dec. 0.0339 0.0289 0.0311
11:01-12:00, Sun., 10 Dec. 0.0337 0.0296 0.0314
10:01-11:00, Sun., 10 Dec. 0.0354 0.0297 0.0324
09:01-10:00, Sun., 10 Dec. 0.0352 0.0302 0.0327
08:01-09:00, Sun., 10 Dec. 0.0346 0.0309 0.0329
07:01-08:00, Sun., 10 Dec. 0.0353 0.0310 0.0332
06:01-07:00, Sun., 10 Dec. 0.0352 0.0300 0.0325
05:01-06:00, Sun., 10 Dec. 0.0345 0.0303 0.0325
04:01-05:00, Sun., 10 Dec. 0.0338 0.0300 0.0320
03:01-04:00, Sun., 10 Dec. 0.0349 0.0297 0.0325
02:01-03:00, Sun., 10 Dec. 0.0344 0.0301 0.0321
01:01-02:00, Sun., 10 Dec. 0.0336 0.0292 0.0313
00:01-01:00, Sun., 10 Dec. 0.0333 0.0294 0.0310
23:01-24:00, Sat., 09 Dec. 0.0328 0.0285 0.0310
22:01-23:00, Sat., 09 Dec. 0.0329 0.0295 0.0313
21:01-22:00, Sat., 09 Dec. 0.0339 0.0285 0.0313
20:01-21:00, Sat., 09 Dec. 0.0328 0.0282 0.0309
19:01-20:00, Sat., 09 Dec. 0.0329 0.0285 0.0304
18:01-19:00, Sat., 09 Dec. 0.0322 0.0281 0.0301
17:01-18:00, Sat., 09 Dec. 0.0324 0.0272 0.0301
16:01-17:00, Sat., 09 Dec. 0.0318 0.0283 0.0301
15:01-16:00, Sat., 09 Dec. 0.0328 0.0274 0.0302
14:01-15:00, Sat., 09 Dec. 0.0319 0.0290 0.0304
13:01-14:00, Sat., 09 Dec. 0.0324 0.0276 0.0302
12:01-13:00, Sat., 09 Dec. 0.0329 0.0287 0.0308
11:01-12:00, Sat., 09 Dec. 0.0326 0.0282 0.0306
10:01-11:00, Sat., 09 Dec. 0.0326 0.0286 0.0306
09:01-10:00, Sat., 09 Dec. 0.0326 0.0285 0.0304
08:01-09:00, Sat., 09 Dec. 0.0326 0.0288 0.0309
07:01-08:00, Sat., 09 Dec. 0.0325 0.0288 0.0308
06:01-07:00, Sat., 09 Dec. 0.0329 0.0293 0.0313
05:01-06:00, Sat., 09 Dec. 0.0321 0.0281 0.0303
04:01-05:00, Sat., 09 Dec. 0.0321 0.0284 0.0302
03:01-04:00, Sat., 09 Dec. 0.0327 0.0287 0.0303
02:01-03:00, Sat., 09 Dec. 0.0323 0.0279 0.0306
01:01-02:00, Sat., 09 Dec. 0.0320 0.0285 0.0305
00:01-01:00, Sat., 09 Dec. 0.0323 0.0275 0.0305
23:01-24:00, Fri., 08 Dec. 0.0323 0.0281 0.0307
22:01-23:00, Fri., 08 Dec. 0.0361 0.0292 0.0317
21:01-22:00, Fri., 08 Dec. 0.0394 0.0310 0.0352
20:01-21:00, Fri., 08 Dec. 0.0516 0.0369 0.0439
19:01-20:00, Fri., 08 Dec. 0.0503 0.0373 0.0437
18:01-19:00, Fri., 08 Dec. 0.0428 0.0368 0.0399
17:01-18:00, Fri., 08 Dec. 0.0411 0.0333 0.0355
16:01-17:00, Fri., 08 Dec. 0.0375 0.0324 0.0354
15:01-16:00, Fri., 08 Dec. 0.0355 0.0292 0.0322
14:01-15:00, Fri., 08 Dec. 0.0331 0.0298 0.0313
13:01-14:00, Fri., 08 Dec. 0.0329 0.0294 0.0311
12:01-13:00, Fri., 08 Dec. 0.0332 0.0303 0.0319
11:01-12:00, Fri., 08 Dec. 0.0355 0.0301 0.0328
10:01-11:00, Fri., 08 Dec. 0.0346 0.0299 0.0326
09:01-10:00, Fri., 08 Dec. 0.0349 0.0307 0.0327
08:01-09:00, Fri., 08 Dec. 0.0351 0.0300 0.0329
07:01-08:00, Fri., 08 Dec. 0.0345 0.0305 0.0328
06:01-07:00, Fri., 08 Dec. 0.0344 0.0307 0.0325
05:01-06:00, Fri., 08 Dec. 0.0343 0.0300 0.0324
04:01-05:00, Fri., 08 Dec. 0.0349 0.0308 0.0325
03:01-04:00, Fri., 08 Dec. 0.0339 0.0305 0.0323
02:01-03:00, Fri., 08 Dec. 0.0348 0.0302 0.0323
01:01-02:00, Fri., 08 Dec. 0.0338 0.0302 0.0322
00:01-01:00, Fri., 08 Dec. 0.0339 0.0296 0.0321
23:01-24:00, Thu., 07 Dec. 0.0337 0.0301 0.0317
22:01-23:00, Thu., 07 Dec. 0.0331 0.0291 0.0311
21:01-22:00, Thu., 07 Dec. 0.0337 0.0294 0.0314
20:01-21:00, Thu., 07 Dec. 0.0325 0.0289 0.0308
19:01-20:00, Thu., 07 Dec. 0.0331 0.0285 0.0309
18:01-19:00, Thu., 07 Dec. 0.0322 0.0286 0.0303
17:01-18:00, Thu., 07 Dec. 0.0328 0.0283 0.0303
16:01-17:00, Thu., 07 Dec. 0.0328 0.0283 0.0304
15:01-16:00, Thu., 07 Dec. 0.0322 0.0283 0.0303
14:01-15:00, Thu., 07 Dec. 0.0321 0.0285 0.0304
13:01-14:00, Thu., 07 Dec. 0.0331 0.0288 0.0309
12:01-13:00, Thu., 07 Dec. 0.0332 0.0289 0.0308
11:01-12:00, Thu., 07 Dec. 0.0335 0.0294 0.0313
10:01-11:00, Thu., 07 Dec. 0.0335 0.0278 0.0313
09:01-10:00, Thu., 07 Dec. 0.0342 0.0299 0.0322
08:01-09:00, Thu., 07 Dec. 0.0353 0.0320 0.0337
07:01-08:00, Thu., 07 Dec. 0.0364 0.0318 0.0334
06:01-07:00, Thu., 07 Dec. 0.0348 0.0309 0.0334
05:01-06:00, Thu., 07 Dec. 0.0348 0.0297 0.0326
04:01-05:00, Thu., 07 Dec. 0.0343 0.0305 0.0325
03:01-04:00, Thu., 07 Dec. 0.0335 0.0303 0.0321
02:01-03:00, Thu., 07 Dec. 0.0330 0.0294 0.0313
01:01-02:00, Thu., 07 Dec. 0.0324 0.0292 0.0309
00:01-01:00, Thu., 07 Dec. 0.0327 0.0282 0.0305
23:01-24:00, Wed., 06 Dec. 0.0328 0.0291 0.0306
22:01-23:00, Wed., 06 Dec. 0.0337 0.0290 0.0310
21:01-22:00, Wed., 06 Dec. 0.0332 0.0293 0.0312
20:01-21:00, Wed., 06 Dec. 0.0335 0.0292 0.0313
19:01-20:00, Wed., 06 Dec. 0.0328 0.0290 0.0313
18:01-19:00, Wed., 06 Dec. 0.0328 0.0271 0.0307
17:01-18:00, Wed., 06 Dec. 0.0333 0.0283 0.0304
16:01-17:00, Wed., 06 Dec. 0.0324 0.0286 0.0304
15:01-16:00, Wed., 06 Dec. 0.0327 0.0283 0.0304
14:01-15:00, Wed., 06 Dec. 0.0327 0.0290 0.0309
13:01-14:00, Wed., 06 Dec. 0.0335 0.0290 0.0310
12:01-13:00, Wed., 06 Dec. 0.0329 0.0296 0.0309
11:01-12:00, Wed., 06 Dec. 0.0345 0.0286 0.0312
10:01-11:00, Wed., 06 Dec. 0.0320 0.0288 0.0308
09:01-10:00, Wed., 06 Dec. 0.0337 0.0281 0.0308
08:01-09:00, Wed., 06 Dec. 0.0328 0.0281 0.0309
07:01-08:00, Wed., 06 Dec. 0.0330 0.0285 0.0307
06:01-07:00, Wed., 06 Dec. 0.0333 0.0295 0.0310
05:01-06:00, Wed., 06 Dec. 0.0342 0.0293 0.0313
04:01-05:00, Wed., 06 Dec. 0.0328 0.0280 0.0307
03:01-04:00, Wed., 06 Dec. 0.0332 0.0288 0.0308
02:01-03:00, Wed., 06 Dec. 0.0326 0.0290 0.0308
01:01-02:00, Wed., 06 Dec. 0.0321 0.0289 0.0302
00:01-01:00, Wed., 06 Dec. 0.0324 0.0282 0.0303
23:01-24:00, Tue., 05 Dec. 0.0321 0.0279 0.0299
22:01-23:00, Tue., 05 Dec. 0.0317 0.0281 0.0299
21:01-22:00, Tue., 05 Dec. 0.0322 0.0277 0.0297
20:01-21:00, Tue., 05 Dec. 0.0312 0.0278 0.0297
19:01-20:00, Tue., 05 Dec. 0.0316 0.0280 0.0298
18:01-19:00, Tue., 05 Dec. 0.0317 0.0283 0.0300
17:01-18:00, Tue., 05 Dec. 0.0327 0.0287 0.0304
16:01-17:00, Tue., 05 Dec. 0.0319 0.0279 0.0300
15:01-16:00, Tue., 05 Dec. 0.0319 0.0281 0.0300
14:01-15:00, Tue., 05 Dec. 0.0327 0.0280 0.0302
13:01-14:00, Tue., 05 Dec. 0.0326 0.0278 0.0303
12:01-13:00, Tue., 05 Dec. 0.0329 0.0281 0.0309
11:01-12:00, Tue., 05 Dec. 0.0329 0.0286 0.0310
10:01-11:00, Tue., 05 Dec. 0.0337 0.0295 0.0316
09:01-10:00, Tue., 05 Dec. 0.0346 0.0290 0.0314
08:01-09:00, Tue., 05 Dec. 0.0340 0.0301 0.0322
07:01-08:00, Tue., 05 Dec. 0.0334 0.0297 0.0316
06:01-07:00, Tue., 05 Dec. 0.0343 0.0305 0.0320
05:01-06:00, Tue., 05 Dec. 0.0341 0.0301 0.0319
04:01-05:00, Tue., 05 Dec. 0.0354 0.0297 0.0319
03:01-04:00, Tue., 05 Dec. 0.0339 0.0296 0.0314
02:01-03:00, Tue., 05 Dec. 0.0327 0.0281 0.0309
01:01-02:00, Tue., 05 Dec. 0.0343 0.0295 0.0312
00:01-01:00, Tue., 05 Dec. 0.0334 0.0293 0.0310
23:01-24:00, Mon., 04 Dec. 0.0337 0.0291 0.0310
22:01-23:00, Mon., 04 Dec. 0.0341 0.0293 0.0313
21:01-22:00, Mon., 04 Dec. 0.0363 0.0302 0.0335
20:01-21:00, Mon., 04 Dec. 0.0411 0.0337 0.0374
19:01-20:00, Mon., 04 Dec. 0.0406 0.0338 0.0364
18:01-19:00, Mon., 04 Dec. 0.0364 0.0311 0.0334
17:01-18:00, Mon., 04 Dec. 0.0363 0.0319 0.0339
16:01-17:00, Mon., 04 Dec. 0.0339 0.0294 0.0315
15:01-16:00, Mon., 04 Dec. 0.0318 0.0263 0.0301
14:01-15:00, Mon., 04 Dec. 0.0328 0.0283 0.0305
13:01-14:00, Mon., 04 Dec. 0.0332 0.0287 0.0311
12:01-13:00, Mon., 04 Dec. 0.0345 0.0291 0.0315
11:01-12:00, Mon., 04 Dec. 0.0333 0.0292 0.0318
10:01-11:00, Mon., 04 Dec. 0.0335 0.0300 0.0318
09:01-10:00, Mon., 04 Dec. 0.0345 0.0303 0.0321
08:01-09:00, Mon., 04 Dec. 0.0344 0.0300 0.0323
07:01-08:00, Mon., 04 Dec. 0.0343 0.0314 0.0326
06:01-07:00, Mon., 04 Dec. 0.0348 0.0302 0.0324
05:01-06:00, Mon., 04 Dec. 0.0339 0.0304 0.0319
04:01-05:00, Mon., 04 Dec. 0.0347 0.0299 0.0324
03:01-04:00, Mon., 04 Dec. 0.0351 0.0301 0.0323
02:01-03:00, Mon., 04 Dec. 0.0342 0.0304 0.0322
01:01-02:00, Mon., 04 Dec. 0.0339 0.0302 0.0323
00:01-01:00, Mon., 04 Dec. 0.0343 0.0302 0.0321
23:01-24:00, Sun., 03 Dec. 0.0341 0.0298 0.0318
22:01-23:00, Sun., 03 Dec. 0.0337 0.0289 0.0311
21:01-22:00, Sun., 03 Dec. 0.0333 0.0291 0.0313
20:01-21:00, Sun., 03 Dec. 0.0335 0.0296 0.0315
19:01-20:00, Sun., 03 Dec. 0.0328 0.0292 0.0308
18:01-19:00, Sun., 03 Dec. 0.0330 0.0282 0.0306
17:01-18:00, Sun., 03 Dec. 0.0321 0.0282 0.0304
16:01-17:00, Sun., 03 Dec. 0.0321 0.0283 0.0304
15:01-16:00, Sun., 03 Dec. 0.0325 0.0293 0.0306
14:01-15:00, Sun., 03 Dec. 0.0323 0.0284 0.0305
13:01-14:00, Sun., 03 Dec. 0.0328 0.0287 0.0308
12:01-13:00, Sun., 03 Dec. 0.0334 0.0292 0.0308
11:01-12:00, Sun., 03 Dec. 0.0337 0.0290 0.0310
10:01-11:00, Sun., 03 Dec. 0.0339 0.0298 0.0319
09:01-10:00, Sun., 03 Dec. 0.0350 0.0304 0.0327
08:01-09:00, Sun., 03 Dec. 0.0355 0.0313 0.0331
07:01-08:00, Sun., 03 Dec. 0.0343 0.0301 0.0324
06:01-07:00, Sun., 03 Dec. 0.0351 0.0304 0.0321
05:01-06:00, Sun., 03 Dec. 0.0340 0.0304 0.0321
04:01-05:00, Sun., 03 Dec. 0.0340 0.0294 0.0316
03:01-04:00, Sun., 03 Dec. 0.0341 0.0293 0.0317
02:01-03:00, Sun., 03 Dec. 0.0328 0.0291 0.0312
01:01-02:00, Sun., 03 Dec. 0.0331 0.0290 0.0305
00:01-01:00, Sun., 03 Dec. 0.0326 0.0290 0.0308
23:01-24:00, Sat., 02 Dec. 0.0324 0.0286 0.0303
22:01-23:00, Sat., 02 Dec. 0.0327 0.0285 0.0303
21:01-22:00, Sat., 02 Dec. 0.0322 0.0293 0.0306
20:01-21:00, Sat., 02 Dec. 0.0332 0.0291 0.0305
19:01-20:00, Sat., 02 Dec. 0.0318 0.0282 0.0299
18:01-19:00, Sat., 02 Dec. 0.0317 0.0278 0.0298
17:01-18:00, Sat., 02 Dec. 0.0328 0.0282 0.0297
16:01-17:00, Sat., 02 Dec. 0.0319 0.0283 0.0301
15:01-16:00, Sat., 02 Dec. 0.0322 0.0276 0.0298
14:01-15:00, Sat., 02 Dec. 0.0324 0.0281 0.0302
13:01-14:00, Sat., 02 Dec. 0.0322 0.0285 0.0300
12:01-13:00, Sat., 02 Dec. 0.0322 0.0279 0.0302
11:01-12:00, Sat., 02 Dec. 0.0321 0.0285 0.0305
10:01-11:00, Sat., 02 Dec. 0.0323 0.0290 0.0303
09:01-10:00, Sat., 02 Dec. 0.0322 0.0284 0.0305
08:01-09:00, Sat., 02 Dec. 0.0316 0.0279 0.0300
07:01-08:00, Sat., 02 Dec. 0.0322 0.0286 0.0302
06:01-07:00, Sat., 02 Dec. 0.0321 0.0285 0.0303
05:01-06:00, Sat., 02 Dec. 0.0319 0.0283 0.0304
04:01-05:00, Sat., 02 Dec. 0.0324 0.0291 0.0308
03:01-04:00, Sat., 02 Dec. 0.0329 0.0288 0.0309
02:01-03:00, Sat., 02 Dec. 0.0324 0.0286 0.0307
01:01-02:00, Sat., 02 Dec. 0.0324 0.0294 0.0308
00:01-01:00, Sat., 02 Dec. 0.0328 0.0287 0.0307
23:01-24:00, Fri., 01 Dec. 0.0326 0.0284 0.0305
22:01-23:00, Fri., 01 Dec. 0.0323 0.0286 0.0301
21:01-22:00, Fri., 01 Dec. 0.0323 0.0282 0.0303
20:01-21:00, Fri., 01 Dec. 0.0330 0.0284 0.0304
19:01-20:00, Fri., 01 Dec. 0.0323 0.0287 0.0305
18:01-19:00, Fri., 01 Dec. 0.0325 0.0283 0.0305
17:01-18:00, Fri., 01 Dec. 0.0322 0.0285 0.0302
16:01-17:00, Fri., 01 Dec. 0.0316 0.0287 0.0304
15:01-16:00, Fri., 01 Dec. 0.0325 0.0282 0.0301
14:01-15:00, Fri., 01 Dec. 0.0321 0.0280 0.0304
13:01-14:00, Fri., 01 Dec. 0.0329 0.0283 0.0302
12:01-13:00, Fri., 01 Dec. 0.0325 0.0286 0.0306