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 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






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. 0.0351 0.0310 0.0326
10:01-11:00, Mon., 11 Dec. 0.0342 0.0299 0.0326
09:01-10:00, Mon., 11 Dec. 0.0349 0.0307 0.0328
08:01-09:00, Mon., 11 Dec. 0.0354 0.0314 0.0333
07:01-08:00, Mon., 11 Dec. 0.0351 0.0309 0.0330
06:01-07:00, Mon., 11 Dec. 0.0349 0.0309 0.0328
05:01-06:00, Mon., 11 Dec. 0.0354 0.0315 0.0334
04:01-05:00, Mon., 11 Dec. 0.0356 0.0311 0.0333
03:01-04:00, Mon., 11 Dec. 0.0354 0.0312 0.0332
02:01-03:00, Mon., 11 Dec. 0.0341 0.0306 0.0329
01:01-02:00, Mon., 11 Dec. 0.0343 0.0313 0.0327
00:01-01:00, Mon., 11 Dec. 0.0346 0.0304 0.0324
23:01-24:00, Sun., 10 Dec. 0.0354 0.0305 0.0326
22:01-23:00, Sun., 10 Dec. 0.0344 0.0308 0.0327
21:01-22:00, Sun., 10 Dec. 0.0348 0.0301 0.0323
20:01-21:00, Sun., 10 Dec. 0.0340 0.0295 0.0322
19:01-20:00, Sun., 10 Dec. 0.0341 0.0305 0.0323
18:01-19:00, Sun., 10 Dec. 0.0351 0.0309 0.0323
17:01-18:00, Sun., 10 Dec. 0.0353 0.0304 0.0322
16:01-17:00, Sun., 10 Dec. 0.0336 0.0290 0.0315
15:01-16:00, Sun., 10 Dec. 0.0342 0.0303 0.0319
14:01-15:00, Sun., 10 Dec. 0.0342 0.0309 0.0325
13:01-14:00, Sun., 10 Dec. 0.0348 0.0309 0.0328
12:01-13:00, Sun., 10 Dec. 0.0348 0.0300 0.0329
11:01-12:00, Sun., 10 Dec. 0.0354 0.0316 0.0332
10:01-11:00, Sun., 10 Dec. 0.0360 0.0325 0.0340
09:01-10:00, Sun., 10 Dec. 0.0364 0.0310 0.0341
08:01-09:00, Sun., 10 Dec. 0.0356 0.0310 0.0337
07:01-08:00, Sun., 10 Dec. 0.0356 0.0311 0.0334
06:01-07:00, Sun., 10 Dec. 0.0352 0.0312 0.0333
05:01-06:00, Sun., 10 Dec. 0.0352 0.0312 0.0333
04:01-05:00, Sun., 10 Dec. 0.0353 0.0306 0.0329
03:01-04:00, Sun., 10 Dec. 0.0347 0.0313 0.0330
02:01-03:00, Sun., 10 Dec. 0.0346 0.0316 0.0331
01:01-02:00, Sun., 10 Dec. 0.0357 0.0314 0.0330
00:01-01:00, Sun., 10 Dec. 0.0343 0.0300 0.0325
23:01-24:00, Sat., 09 Dec. 0.0339 0.0295 0.0321
22:01-23:00, Sat., 09 Dec. 0.0337 0.0307 0.0320
21:01-22:00, Sat., 09 Dec. 0.0336 0.0304 0.0319
20:01-21:00, Sat., 09 Dec. 0.0335 0.0302 0.0317
19:01-20:00, Sat., 09 Dec. 0.0334 0.0300 0.0313
18:01-19:00, Sat., 09 Dec. 0.0334 0.0292 0.0313
17:01-18:00, Sat., 09 Dec. 0.0339 0.0294 0.0312
16:01-17:00, Sat., 09 Dec. 0.0338 0.0296 0.0312
15:01-16:00, Sat., 09 Dec. 0.0337 0.0298 0.0315
14:01-15:00, Sat., 09 Dec. 0.0335 0.0298 0.0315
13:01-14:00, Sat., 09 Dec. 0.0333 0.0293 0.0316
12:01-13:00, Sat., 09 Dec. 0.0337 0.0299 0.0317
11:01-12:00, Sat., 09 Dec. 0.0344 0.0289 0.0316
10:01-11:00, Sat., 09 Dec. 0.0332 0.0289 0.0315
09:01-10:00, Sat., 09 Dec. 0.0328 0.0290 0.0312
08:01-09:00, Sat., 09 Dec. 0.0323 0.0295 0.0311
07:01-08:00, Sat., 09 Dec. 0.0333 0.0289 0.0313
06:01-07:00, Sat., 09 Dec. 0.0333 0.0292 0.0312
05:01-06:00, Sat., 09 Dec. 0.0336 0.0293 0.0315
04:01-05:00, Sat., 09 Dec. 0.0338 0.0293 0.0314
03:01-04:00, Sat., 09 Dec. 0.0333 0.0303 0.0317
02:01-03:00, Sat., 09 Dec. 0.0338 0.0300 0.0316
01:01-02:00, Sat., 09 Dec. 0.0335 0.0300 0.0318
00:01-01:00, Sat., 09 Dec. 0.0346 0.0308 0.0327
23:01-24:00, Fri., 08 Dec. 0.0383 0.0312 0.0351
22:01-23:00, Fri., 08 Dec. 0.0569 0.0369 0.0448
21:01-22:00, Fri., 08 Dec. 0.0640 0.0508 0.0576
20:01-21:00, Fri., 08 Dec. 0.0631 0.0546 0.0587
19:01-20:00, Fri., 08 Dec. 0.0598 0.0430 0.0503
18:01-19:00, Fri., 08 Dec. 0.0475 0.0350 0.0391
17:01-18:00, Fri., 08 Dec. 0.0352 0.0312 0.0330
16:01-17:00, Fri., 08 Dec. 0.0348 0.0315 0.0331
15:01-16:00, Fri., 08 Dec. 0.0354 0.0312 0.0334
14:01-15:00, Fri., 08 Dec. 0.0358 0.0315 0.0334
13:01-14:00, Fri., 08 Dec. 0.0355 0.0312 0.0334
12:01-13:00, Fri., 08 Dec. 0.0356 0.0320 0.0337
11:01-12:00, Fri., 08 Dec. 0.0360 0.0310 0.0342
10:01-11:00, Fri., 08 Dec. 0.0371 0.0324 0.0343
09:01-10:00, Fri., 08 Dec. 0.0370 0.0326 0.0342
08:01-09:00, Fri., 08 Dec. 0.0359 0.0313 0.0339
07:01-08:00, Fri., 08 Dec. 0.0354 0.0312 0.0335
06:01-07:00, Fri., 08 Dec. 0.0361 0.0316 0.0335
05:01-06:00, Fri., 08 Dec. 0.0354 0.0314 0.0335
04:01-05:00, Fri., 08 Dec. 0.0359 0.0308 0.0330
03:01-04:00, Fri., 08 Dec. 0.0345 0.0312 0.0332
02:01-03:00, Fri., 08 Dec. 0.0352 0.0307 0.0328
01:01-02:00, Fri., 08 Dec. 0.0345 0.0309 0.0327
00:01-01:00, Fri., 08 Dec. 0.0350 0.0308 0.0326
23:01-24:00, Thu., 07 Dec. 0.0350 0.0306 0.0327
22:01-23:00, Thu., 07 Dec. 0.0343 0.0303 0.0324
21:01-22:00, Thu., 07 Dec. 0.0343 0.0299 0.0318
20:01-21:00, Thu., 07 Dec. 0.0337 0.0292 0.0318
19:01-20:00, Thu., 07 Dec. 0.0336 0.0295 0.0315
18:01-19:00, Thu., 07 Dec. 0.0331 0.0297 0.0313
17:01-18:00, Thu., 07 Dec. 0.0327 0.0292 0.0312
16:01-17:00, Thu., 07 Dec. 0.0332 0.0285 0.0312
15:01-16:00, Thu., 07 Dec. 0.0345 0.0297 0.0316
14:01-15:00, Thu., 07 Dec. 0.0336 0.0295 0.0316
13:01-14:00, Thu., 07 Dec. 0.0339 0.0299 0.0322
12:01-13:00, Thu., 07 Dec. 0.0350 0.0306 0.0329
11:01-12:00, Thu., 07 Dec. 0.0351 0.0306 0.0326
10:01-11:00, Thu., 07 Dec. 0.0348 0.0307 0.0328
09:01-10:00, Thu., 07 Dec. 0.0348 0.0308 0.0329
08:01-09:00, Thu., 07 Dec. 0.0348 0.0312 0.0331
07:01-08:00, Thu., 07 Dec. 0.0366 0.0311 0.0330
06:01-07:00, Thu., 07 Dec. 0.0351 0.0314 0.0330
05:01-06:00, Thu., 07 Dec. 0.0351 0.0312 0.0332
04:01-05:00, Thu., 07 Dec. 0.0349 0.0306 0.0327
03:01-04:00, Thu., 07 Dec. 0.0345 0.0308 0.0327
02:01-03:00, Thu., 07 Dec. 0.0346 0.0302 0.0324
01:01-02:00, Thu., 07 Dec. 0.0344 0.0296 0.0322
00:01-01:00, Thu., 07 Dec. 0.0347 0.0303 0.0319
23:01-24:00, Wed., 06 Dec. 0.0344 0.0307 0.0323
22:01-23:00, Wed., 06 Dec. 0.0347 0.0306 0.0322
21:01-22:00, Wed., 06 Dec. 0.0335 0.0296 0.0318
20:01-21:00, Wed., 06 Dec. 0.0337 0.0302 0.0317
19:01-20:00, Wed., 06 Dec. 0.0338 0.0297 0.0316
18:01-19:00, Wed., 06 Dec. 0.0341 0.0299 0.0316
17:01-18:00, Wed., 06 Dec. 0.0351 0.0296 0.0318
16:01-17:00, Wed., 06 Dec. 0.0336 0.0307 0.0319
15:01-16:00, Wed., 06 Dec. 0.0342 0.0297 0.0320
14:01-15:00, Wed., 06 Dec. 0.0345 0.0301 0.0322
13:01-14:00, Wed., 06 Dec. 0.0343 0.0305 0.0324
12:01-13:00, Wed., 06 Dec. 0.0342 0.0302 0.0321
11:01-12:00, Wed., 06 Dec. 0.0335 0.0291 0.0318
10:01-11:00, Wed., 06 Dec. 0.0348 0.0306 0.0325
09:01-10:00, Wed., 06 Dec. 0.0340 0.0303 0.0320
08:01-09:00, Wed., 06 Dec. 0.0344 0.0295 0.0317
07:01-08:00, Wed., 06 Dec. 0.0340 0.0297 0.0317
06:01-07:00, Wed., 06 Dec. 0.0337 0.0293 0.0316
05:01-06:00, Wed., 06 Dec. 0.0332 0.0295 0.0316
04:01-05:00, Wed., 06 Dec. 0.0338 0.0303 0.0319
03:01-04:00, Wed., 06 Dec. 0.0341 0.0297 0.0321
02:01-03:00, Wed., 06 Dec. 0.0334 0.0302 0.0320
01:01-02:00, Wed., 06 Dec. 0.0341 0.0294 0.0317
00:01-01:00, Wed., 06 Dec. 0.0337 0.0286 0.0318
23:01-24:00, Tue., 05 Dec. 0.0340 0.0293 0.0317
22:01-23:00, Tue., 05 Dec. 0.0344 0.0301 0.0317
21:01-22:00, Tue., 05 Dec. 0.0336 0.0290 0.0317
20:01-21:00, Tue., 05 Dec. 0.0341 0.0295 0.0313
19:01-20:00, Tue., 05 Dec. 0.0332 0.0292 0.0313
18:01-19:00, Tue., 05 Dec. 0.0334 0.0293 0.0314
17:01-18:00, Tue., 05 Dec. 0.0341 0.0295 0.0315
16:01-17:00, Tue., 05 Dec. 0.0337 0.0299 0.0315
15:01-16:00, Tue., 05 Dec. 0.0338 0.0290 0.0315
14:01-15:00, Tue., 05 Dec. 0.0336 0.0301 0.0318
13:01-14:00, Tue., 05 Dec. 0.0333 0.0294 0.0319
12:01-13:00, Tue., 05 Dec. 0.0337 0.0302 0.0318
11:01-12:00, Tue., 05 Dec. 0.0338 0.0303 0.0322
10:01-11:00, Tue., 05 Dec. 0.0347 0.0298 0.0320
09:01-10:00, Tue., 05 Dec. 0.0344 0.0300 0.0323
08:01-09:00, Tue., 05 Dec. 0.0347 0.0310 0.0327
07:01-08:00, Tue., 05 Dec. 0.0357 0.0309 0.0330
06:01-07:00, Tue., 05 Dec. 0.0348 0.0305 0.0327
05:01-06:00, Tue., 05 Dec. 0.0355 0.0308 0.0327
04:01-05:00, Tue., 05 Dec. 0.0345 0.0307 0.0324
03:01-04:00, Tue., 05 Dec. 0.0350 0.0306 0.0324
02:01-03:00, Tue., 05 Dec. 0.0352 0.0297 0.0324
01:01-02:00, Tue., 05 Dec. 0.0343 0.0300 0.0324
00:01-01:00, Tue., 05 Dec. 0.0344 0.0297 0.0323
23:01-24:00, Mon., 04 Dec. 0.0342 0.0309 0.0324
22:01-23:00, Mon., 04 Dec. 0.0341 0.0299 0.0325
21:01-22:00, Mon., 04 Dec. 0.0385 0.0304 0.0347
20:01-21:00, Mon., 04 Dec. 0.0419 0.0341 0.0374
19:01-20:00, Mon., 04 Dec. 0.0417 0.0361 0.0388
18:01-19:00, Mon., 04 Dec. 0.0379 0.0317 0.0345
17:01-18:00, Mon., 04 Dec. 0.0361 0.0314 0.0340
16:01-17:00, Mon., 04 Dec. 0.0349 0.0305 0.0323
15:01-16:00, Mon., 04 Dec. 0.0343 0.0302 0.0321
14:01-15:00, Mon., 04 Dec. 0.0345 0.0296 0.0321
13:01-14:00, Mon., 04 Dec. 0.0349 0.0306 0.0324
12:01-13:00, Mon., 04 Dec. 0.0346 0.0305 0.0326
11:01-12:00, Mon., 04 Dec. 0.0346 0.0303 0.0326
10:01-11:00, Mon., 04 Dec. 0.0354 0.0310 0.0329
09:01-10:00, Mon., 04 Dec. 0.0351 0.0309 0.0333
08:01-09:00, Mon., 04 Dec. 0.0350 0.0306 0.0331
07:01-08:00, Mon., 04 Dec. 0.0359 0.0310 0.0330
06:01-07:00, Mon., 04 Dec. 0.0356 0.0307 0.0328
05:01-06:00, Mon., 04 Dec. 0.0353 0.0311 0.0332
04:01-05:00, Mon., 04 Dec. 0.0342 0.0300 0.0326
03:01-04:00, Mon., 04 Dec. 0.0342 0.0309 0.0324
02:01-03:00, Mon., 04 Dec. 0.0346 0.0297 0.0325
01:01-02:00, Mon., 04 Dec. 0.0348 0.0306 0.0325
00:01-01:00, Mon., 04 Dec. 0.0346 0.0300 0.0326
23:01-24:00, Sun., 03 Dec. 0.0345 0.0306 0.0326
22:01-23:00, Sun., 03 Dec. 0.0340 0.0303 0.0323
21:01-22:00, Sun., 03 Dec. 0.0341 0.0294 0.0321
20:01-21:00, Sun., 03 Dec. 0.0349 0.0305 0.0324
19:01-20:00, Sun., 03 Dec. 0.0340 0.0302 0.0321
18:01-19:00, Sun., 03 Dec. 0.0336 0.0302 0.0318
17:01-18:00, Sun., 03 Dec. 0.0334 0.0297 0.0318
16:01-17:00, Sun., 03 Dec. 0.0336 0.0297 0.0319
15:01-16:00, Sun., 03 Dec. 0.0334 0.0298 0.0319
14:01-15:00, Sun., 03 Dec. 0.0342 0.0293 0.0318
13:01-14:00, Sun., 03 Dec. 0.0345 0.0302 0.0322
12:01-13:00, Sun., 03 Dec. 0.0343 0.0298 0.0322
11:01-12:00, Sun., 03 Dec. 0.0342 0.0307 0.0324
10:01-11:00, Sun., 03 Dec. 0.0343 0.0312 0.0328
09:01-10:00, Sun., 03 Dec. 0.0350 0.0303 0.0330
08:01-09:00, Sun., 03 Dec. 0.0356 0.0300 0.0329
07:01-08:00, Sun., 03 Dec. 0.0347 0.0309 0.0325
06:01-07:00, Sun., 03 Dec. 0.0342 0.0307 0.0325
05:01-06:00, Sun., 03 Dec. 0.0349 0.0309 0.0327
04:01-05:00, Sun., 03 Dec. 0.0345 0.0307 0.0328
03:01-04:00, Sun., 03 Dec. 0.0342 0.0308 0.0327
02:01-03:00, Sun., 03 Dec. 0.0340 0.0308 0.0325
01:01-02:00, Sun., 03 Dec. 0.0345 0.0305 0.0327
00:01-01:00, Sun., 03 Dec. 0.0338 0.0291 0.0320
23:01-24:00, Sat., 02 Dec. 0.0340 0.0303 0.0318
22:01-23:00, Sat., 02 Dec. 0.0330 0.0295 0.0314
21:01-22:00, Sat., 02 Dec. 0.0331 0.0294 0.0311
20:01-21:00, Sat., 02 Dec. 0.0336 0.0296 0.0314
19:01-20:00, Sat., 02 Dec. 0.0334 0.0290 0.0313
18:01-19:00, Sat., 02 Dec. 0.0341 0.0291 0.0311
17:01-18:00, Sat., 02 Dec. 0.0333 0.0288 0.0311
16:01-17:00, Sat., 02 Dec. 0.0323 0.0289 0.0308
15:01-16:00, Sat., 02 Dec. 0.0324 0.0294 0.0310
14:01-15:00, Sat., 02 Dec. 0.0333 0.0298 0.0314
13:01-14:00, Sat., 02 Dec. 0.0337 0.0296 0.0313
12:01-13:00, Sat., 02 Dec. 0.0328 0.0298 0.0313
11:01-12:00, Sat., 02 Dec. 0.0333 0.0294 0.0314
10:01-11:00, Sat., 02 Dec. 0.0332 0.0298 0.0314
09:01-10:00, Sat., 02 Dec. 0.0342 0.0295 0.0317
08:01-09:00, Sat., 02 Dec. 0.0335 0.0302 0.0318
07:01-08:00, Sat., 02 Dec. 0.0339 0.0297 0.0318
06:01-07:00, Sat., 02 Dec. 0.0338 0.0298 0.0317
05:01-06:00, Sat., 02 Dec. 0.0356 0.0296 0.0320
04:01-05:00, Sat., 02 Dec. 0.0343 0.0302 0.0318
03:01-04:00, Sat., 02 Dec. 0.0343 0.0300 0.0319
02:01-03:00, Sat., 02 Dec. 0.0348 0.0302 0.0323
01:01-02:00, Sat., 02 Dec. 0.0336 0.0307 0.0322
00:01-01:00, Sat., 02 Dec. 0.0344 0.0303 0.0322
23:01-24:00, Fri., 01 Dec. 0.0339 0.0293 0.0316
22:01-23:00, Fri., 01 Dec. 0.0350 0.0308 0.0322
21:01-22:00, Fri., 01 Dec. 0.0335 0.0294 0.0316
20:01-21:00, Fri., 01 Dec. 0.0343 0.0293 0.0318
19:01-20:00, Fri., 01 Dec. 0.0334 0.0296 0.0315
18:01-19:00, Fri., 01 Dec. 0.0338 0.0296 0.0315
17:01-18:00, Fri., 01 Dec. 0.0341 0.0290 0.0315
16:01-17:00, Fri., 01 Dec. 0.0339 0.0292 0.0314
15:01-16:00, Fri., 01 Dec. 0.0338 0.0289 0.0315
14:01-15:00, Fri., 01 Dec. 0.0331 0.0301 0.0316
13:01-14:00, Fri., 01 Dec. 0.0341 0.0305 0.0320
12:01-13:00, Fri., 01 Dec. 0.0337 0.0289 0.0319