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, February 6,2018 Hachioji
From 13:00 to 16:00 on Tuesday, February 6,2018 Kodaira
From 10:00 to 13:00 on Wednesday, February 7,2018 Chofu
From 13:00 to 16:00 on Wednesday, February 7,2018 Ota
From 10:00 to 13:00 on Thursday, February 8,2018 Adachi
From 13:00 to 16:00 on Thursday, February 8,2018 Edogawa
From 10:00 to 13:00 on Friday, February 9,2018 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
13:01-14:00, Tue., 20 Feb. 0.0344 0.0300 0.0319
12:01-13:00, Tue., 20 Feb. 0.0338 0.0293 0.0318
11:01-12:00, Tue., 20 Feb. 0.0341 0.0304 0.0319
10:01-11:00, Tue., 20 Feb. 0.0346 0.0301 0.0322
09:01-10:00, Tue., 20 Feb. 0.0345 0.0302 0.0325
08:01-09:00, Tue., 20 Feb. 0.0345 0.0295 0.0323
07:01-08:00, Tue., 20 Feb. 0.0348 0.0291 0.0325
06:01-07:00, Tue., 20 Feb. 0.0344 0.0308 0.0323
05:01-06:00, Tue., 20 Feb. 0.0336 0.0297 0.0317
04:01-05:00, Tue., 20 Feb. 0.0330 0.0298 0.0314
03:01-04:00, Tue., 20 Feb. 0.0335 0.0278 0.0315
02:01-03:00, Tue., 20 Feb. 0.0336 0.0292 0.0318
01:01-02:00, Tue., 20 Feb. 0.0336 0.0295 0.0317
00:01-01:00, Tue., 20 Feb. 0.0344 0.0299 0.0321
23:01-24:00, Mon., 19 Feb. 0.0347 0.0299 0.0319
22:01-23:00, Mon., 19 Feb. 0.0330 0.0295 0.0313
21:01-22:00, Mon., 19 Feb. 0.0342 0.0296 0.0314
20:01-21:00, Mon., 19 Feb. 0.0331 0.0297 0.0312
19:01-20:00, Mon., 19 Feb. 0.0335 0.0292 0.0312
18:01-19:00, Mon., 19 Feb. 0.0333 0.0290 0.0311
17:01-18:00, Mon., 19 Feb. 0.0335 0.0290 0.0313
16:01-17:00, Mon., 19 Feb. 0.0330 0.0286 0.0313
15:01-16:00, Mon., 19 Feb. 0.0339 0.0291 0.0313
14:01-15:00, Mon., 19 Feb. 0.0340 0.0294 0.0315
13:01-14:00, Mon., 19 Feb. 0.0330 0.0292 0.0315
12:01-13:00, Mon., 19 Feb. 0.0339 0.0291 0.0314
11:01-12:00, Mon., 19 Feb. 0.0330 0.0296 0.0313
10:01-11:00, Mon., 19 Feb. 0.0330 0.0297 0.0312
09:01-10:00, Mon., 19 Feb. 0.0337 0.0295 0.0311
08:01-09:00, Mon., 19 Feb. 0.0329 0.0297 0.0313
07:01-08:00, Mon., 19 Feb. 0.0350 0.0286 0.0311
06:01-07:00, Mon., 19 Feb. 0.0329 0.0300 0.0312
05:01-06:00, Mon., 19 Feb. 0.0336 0.0296 0.0314
04:01-05:00, Mon., 19 Feb. 0.0333 0.0296 0.0313
03:01-04:00, Mon., 19 Feb. 0.0333 0.0297 0.0313
02:01-03:00, Mon., 19 Feb. 0.0339 0.0285 0.0315
01:01-02:00, Mon., 19 Feb. 0.0331 0.0289 0.0315
00:01-01:00, Mon., 19 Feb. 0.0334 0.0297 0.0315
23:01-24:00, Sun., 18 Feb. 0.0347 0.0297 0.0316
22:01-23:00, Sun., 18 Feb. 0.0334 0.0300 0.0314
21:01-22:00, Sun., 18 Feb. 0.0339 0.0296 0.0315
20:01-21:00, Sun., 18 Feb. 0.0337 0.0295 0.0316
19:01-20:00, Sun., 18 Feb. 0.0334 0.0295 0.0313
18:01-19:00, Sun., 18 Feb. 0.0331 0.0296 0.0313
17:01-18:00, Sun., 18 Feb. 0.0335 0.0299 0.0314
16:01-17:00, Sun., 18 Feb. 0.0339 0.0297 0.0311
15:01-16:00, Sun., 18 Feb. 0.0335 0.0290 0.0312
14:01-15:00, Sun., 18 Feb. 0.0333 0.0296 0.0315
13:01-14:00, Sun., 18 Feb. 0.0336 0.0294 0.0314
12:01-13:00, Sun., 18 Feb. 0.0334 0.0294 0.0315
11:01-12:00, Sun., 18 Feb. 0.0329 0.0295 0.0313
10:01-11:00, Sun., 18 Feb. 0.0342 0.0294 0.0317
09:01-10:00, Sun., 18 Feb. 0.0336 0.0290 0.0314
08:01-09:00, Sun., 18 Feb. 0.0333 0.0278 0.0306
07:01-08:00, Sun., 18 Feb. 0.0323 0.0280 0.0303
06:01-07:00, Sun., 18 Feb. 0.0331 0.0296 0.0314
05:01-06:00, Sun., 18 Feb. 0.0338 0.0299 0.0316
04:01-05:00, Sun., 18 Feb. 0.0339 0.0296 0.0315
03:01-04:00, Sun., 18 Feb. 0.0340 0.0297 0.0316
02:01-03:00, Sun., 18 Feb. 0.0341 0.0298 0.0317
01:01-02:00, Sun., 18 Feb. 0.0341 0.0295 0.0317
00:01-01:00, Sun., 18 Feb. 0.0341 0.0297 0.0319
23:01-24:00, Sat., 17 Feb. 0.0343 0.0288 0.0320
22:01-23:00, Sat., 17 Feb. 0.0341 0.0300 0.0319
21:01-22:00, Sat., 17 Feb. 0.0335 0.0305 0.0321
20:01-21:00, Sat., 17 Feb. 0.0345 0.0302 0.0324
19:01-20:00, Sat., 17 Feb. 0.0345 0.0302 0.0321
18:01-19:00, Sat., 17 Feb. 0.0337 0.0306 0.0323
17:01-18:00, Sat., 17 Feb. 0.0339 0.0303 0.0322
16:01-17:00, Sat., 17 Feb. 0.0340 0.0305 0.0323
15:01-16:00, Sat., 17 Feb. 0.0344 0.0307 0.0325
14:01-15:00, Sat., 17 Feb. 0.0333 0.0298 0.0315
13:01-14:00, Sat., 17 Feb. 0.0334 0.0299 0.0314
12:01-13:00, Sat., 17 Feb. 0.0336 0.0293 0.0314
11:01-12:00, Sat., 17 Feb. 0.0327 0.0294 0.0310
10:01-11:00, Sat., 17 Feb. 0.0335 0.0289 0.0314
09:01-10:00, Sat., 17 Feb. 0.0332 0.0296 0.0313
08:01-09:00, Sat., 17 Feb. 0.0335 0.0295 0.0315
07:01-08:00, Sat., 17 Feb. 0.0330 0.0295 0.0312
06:01-07:00, Sat., 17 Feb. 0.0330 0.0290 0.0311
05:01-06:00, Sat., 17 Feb. 0.0337 0.0297 0.0314
04:01-05:00, Sat., 17 Feb. 0.0328 0.0288 0.0313
03:01-04:00, Sat., 17 Feb. 0.0332 0.0291 0.0312
02:01-03:00, Sat., 17 Feb. 0.0332 0.0294 0.0314
01:01-02:00, Sat., 17 Feb. 0.0324 0.0297 0.0314
00:01-01:00, Sat., 17 Feb. 0.0328 0.0295 0.0314
23:01-24:00, Fri., 16 Feb. 0.0334 0.0287 0.0312
22:01-23:00, Fri., 16 Feb. 0.0328 0.0293 0.0312
21:01-22:00, Fri., 16 Feb. 0.0332 0.0295 0.0310
20:01-21:00, Fri., 16 Feb. 0.0331 0.0295 0.0310
19:01-20:00, Fri., 16 Feb. 0.0339 0.0294 0.0313
18:01-19:00, Fri., 16 Feb. 0.0329 0.0285 0.0311
17:01-18:00, Fri., 16 Feb. 0.0337 0.0297 0.0313
16:01-17:00, Fri., 16 Feb. 0.0328 0.0291 0.0309
15:01-16:00, Fri., 16 Feb. 0.0337 0.0293 0.0311
14:01-15:00, Fri., 16 Feb. 0.0331 0.0292 0.0311
13:01-14:00, Fri., 16 Feb. 0.0331 0.0284 0.0310
12:01-13:00, Fri., 16 Feb. 0.0328 0.0284 0.0305
11:01-12:00, Fri., 16 Feb. 0.0332 0.0292 0.0313
10:01-11:00, Fri., 16 Feb. 0.0329 0.0288 0.0314
09:01-10:00, Fri., 16 Feb. 0.0334 0.0290 0.0312
08:01-09:00, Fri., 16 Feb. 0.0332 0.0287 0.0311
07:01-08:00, Fri., 16 Feb. 0.0329 0.0290 0.0308
06:01-07:00, Fri., 16 Feb. 0.0331 0.0292 0.0312
05:01-06:00, Fri., 16 Feb. 0.0334 0.0294 0.0315
04:01-05:00, Fri., 16 Feb. 0.0334 0.0291 0.0315
03:01-04:00, Fri., 16 Feb. 0.0327 0.0295 0.0312
02:01-03:00, Fri., 16 Feb. 0.0329 0.0294 0.0313
01:01-02:00, Fri., 16 Feb. 0.0335 0.0290 0.0313
00:01-01:00, Fri., 16 Feb. 0.0337 0.0295 0.0315
23:01-24:00, Thu., 15 Feb. 0.0330 0.0299 0.0315
22:01-23:00, Thu., 15 Feb. 0.0331 0.0294 0.0314
21:01-22:00, Thu., 15 Feb. 0.0337 0.0297 0.0317
20:01-21:00, Thu., 15 Feb. 0.0336 0.0296 0.0312
19:01-20:00, Thu., 15 Feb. 0.0334 0.0296 0.0313
18:01-19:00, Thu., 15 Feb. 0.0328 0.0288 0.0310
17:01-18:00, Thu., 15 Feb. 0.0326 0.0284 0.0308
16:01-17:00, Thu., 15 Feb. 0.0326 0.0294 0.0310
15:01-16:00, Thu., 15 Feb. 0.0327 0.0291 0.0310
14:01-15:00, Thu., 15 Feb. 0.0344 0.0293 0.0314
13:01-14:00, Thu., 15 Feb. 0.0338 0.0298 0.0316
12:01-13:00, Thu., 15 Feb. 0.0337 0.0297 0.0314
11:01-12:00, Thu., 15 Feb. 0.0337 0.0289 0.0313
10:01-11:00, Thu., 15 Feb. 0.0343 0.0301 0.0319
09:01-10:00, Thu., 15 Feb. 0.0328 0.0281 0.0308
08:01-09:00, Thu., 15 Feb. 0.0320 0.0276 0.0301
07:01-08:00, Thu., 15 Feb. 0.0319 0.0285 0.0301
06:01-07:00, Thu., 15 Feb. 0.0325 0.0275 0.0306
05:01-06:00, Thu., 15 Feb. 0.0333 0.0300 0.0314
04:01-05:00, Thu., 15 Feb. 0.0340 0.0295 0.0312
03:01-04:00, Thu., 15 Feb. 0.0328 0.0290 0.0312
02:01-03:00, Thu., 15 Feb. 0.0331 0.0283 0.0311
01:01-02:00, Thu., 15 Feb. 0.0338 0.0293 0.0312
00:01-01:00, Thu., 15 Feb. 0.0337 0.0293 0.0310
23:01-24:00, Wed., 14 Feb. 0.0332 0.0303 0.0316
22:01-23:00, Wed., 14 Feb. 0.0335 0.0297 0.0314
21:01-22:00, Wed., 14 Feb. 0.0325 0.0285 0.0311
20:01-21:00, Wed., 14 Feb. 0.0332 0.0290 0.0310
19:01-20:00, Wed., 14 Feb. 0.0331 0.0296 0.0309
18:01-19:00, Wed., 14 Feb. 0.0331 0.0285 0.0308
17:01-18:00, Wed., 14 Feb. 0.0327 0.0278 0.0304
16:01-17:00, Wed., 14 Feb. 0.0328 0.0288 0.0310
15:01-16:00, Wed., 14 Feb. 0.0336 0.0287 0.0310
14:01-15:00, Wed., 14 Feb. 0.0333 0.0291 0.0311
13:01-14:00, Wed., 14 Feb. 0.0329 0.0284 0.0312
12:01-13:00, Wed., 14 Feb. 0.0338 0.0292 0.0313
11:01-12:00, Wed., 14 Feb. 0.0336 0.0293 0.0312
10:01-11:00, Wed., 14 Feb. 0.0339 0.0286 0.0314
09:01-10:00, Wed., 14 Feb. 0.0332 0.0296 0.0315
08:01-09:00, Wed., 14 Feb. 0.0339 0.0292 0.0314
07:01-08:00, Wed., 14 Feb. 0.0338 0.0296 0.0314
06:01-07:00, Wed., 14 Feb. 0.0332 0.0296 0.0314
05:01-06:00, Wed., 14 Feb. 0.0335 0.0296 0.0314
04:01-05:00, Wed., 14 Feb. 0.0338 0.0296 0.0314
03:01-04:00, Wed., 14 Feb. 0.0326 0.0292 0.0309
02:01-03:00, Wed., 14 Feb. 0.0331 0.0293 0.0312
01:01-02:00, Wed., 14 Feb. 0.0330 0.0292 0.0310
00:01-01:00, Wed., 14 Feb. 0.0338 0.0290 0.0313
23:01-24:00, Tue., 13 Feb. 0.0331 0.0293 0.0312
22:01-23:00, Tue., 13 Feb. 0.0331 0.0292 0.0317
21:01-22:00, Tue., 13 Feb. 0.0339 0.0292 0.0314
20:01-21:00, Tue., 13 Feb. 0.0343 0.0290 0.0312
19:01-20:00, Tue., 13 Feb. 0.0340 0.0295 0.0315
18:01-19:00, Tue., 13 Feb. 0.0330 0.0296 0.0314
17:01-18:00, Tue., 13 Feb. 0.0326 0.0291 0.0310
16:01-17:00, Tue., 13 Feb. 0.0331 0.0291 0.0313
15:01-16:00, Tue., 13 Feb. 0.0332 0.0279 0.0310
14:01-15:00, Tue., 13 Feb. 0.0329 0.0290 0.0308
13:01-14:00, Tue., 13 Feb. 0.0329 0.0286 0.0307
12:01-13:00, Tue., 13 Feb. 0.0332 0.0285 0.0310
11:01-12:00, Tue., 13 Feb. 0.0328 0.0290 0.0310
10:01-11:00, Tue., 13 Feb. 0.0336 0.0293 0.0310
09:01-10:00, Tue., 13 Feb. 0.0332 0.0297 0.0313
08:01-09:00, Tue., 13 Feb. 0.0328 0.0291 0.0310
07:01-08:00, Tue., 13 Feb. 0.0335 0.0286 0.0313
06:01-07:00, Tue., 13 Feb. 0.0332 0.0293 0.0313
05:01-06:00, Tue., 13 Feb. 0.0333 0.0293 0.0312
04:01-05:00, Tue., 13 Feb. 0.0331 0.0297 0.0313
03:01-04:00, Tue., 13 Feb. 0.0327 0.0289 0.0311
02:01-03:00, Tue., 13 Feb. 0.0337 0.0294 0.0313
01:01-02:00, Tue., 13 Feb. 0.0326 0.0290 0.0311
00:01-01:00, Tue., 13 Feb. 0.0332 0.0293 0.0315
23:01-24:00, Mon., 12 Feb. 0.0335 0.0300 0.0314
22:01-23:00, Mon., 12 Feb. 0.0331 0.0297 0.0314
21:01-22:00, Mon., 12 Feb. 0.0336 0.0297 0.0315
20:01-21:00, Mon., 12 Feb. 0.0333 0.0296 0.0314
19:01-20:00, Mon., 12 Feb. 0.0336 0.0291 0.0311
18:01-19:00, Mon., 12 Feb. 0.0334 0.0292 0.0312
17:01-18:00, Mon., 12 Feb. 0.0337 0.0290 0.0311
16:01-17:00, Mon., 12 Feb. 0.0330 0.0290 0.0312
15:01-16:00, Mon., 12 Feb. 0.0341 0.0294 0.0316
14:01-15:00, Mon., 12 Feb. 0.0334 0.0298 0.0316
13:01-14:00, Mon., 12 Feb. 0.0337 0.0299 0.0317
12:01-13:00, Mon., 12 Feb. 0.0330 0.0299 0.0314
11:01-12:00, Mon., 12 Feb. 0.0331 0.0295 0.0315
10:01-11:00, Mon., 12 Feb. 0.0337 0.0297 0.0313
09:01-10:00, Mon., 12 Feb. 0.0334 0.0299 0.0314
08:01-09:00, Mon., 12 Feb. 0.0329 0.0292 0.0313
07:01-08:00, Mon., 12 Feb. 0.0336 0.0287 0.0312
06:01-07:00, Mon., 12 Feb. 0.0329 0.0291 0.0310
05:01-06:00, Mon., 12 Feb. 0.0330 0.0295 0.0313
04:01-05:00, Mon., 12 Feb. 0.0338 0.0297 0.0315
03:01-04:00, Mon., 12 Feb. 0.0336 0.0292 0.0315
02:01-03:00, Mon., 12 Feb. 0.0336 0.0296 0.0316
01:01-02:00, Mon., 12 Feb. 0.0338 0.0299 0.0316
00:01-01:00, Mon., 12 Feb. 0.0337 0.0298 0.0315
23:01-24:00, Sun., 11 Feb. 0.0335 0.0292 0.0314
22:01-23:00, Sun., 11 Feb. 0.0334 0.0298 0.0312
21:01-22:00, Sun., 11 Feb. 0.0338 0.0293 0.0313
20:01-21:00, Sun., 11 Feb. 0.0331 0.0297 0.0316
19:01-20:00, Sun., 11 Feb. 0.0338 0.0293 0.0315
18:01-19:00, Sun., 11 Feb. 0.0334 0.0295 0.0313
17:01-18:00, Sun., 11 Feb. 0.0338 0.0294 0.0314
16:01-17:00, Sun., 11 Feb. 0.0332 0.0297 0.0313
15:01-16:00, Sun., 11 Feb. 0.0339 0.0302 0.0318
14:01-15:00, Sun., 11 Feb. 0.0336 0.0294 0.0315
13:01-14:00, Sun., 11 Feb. 0.0335 0.0298 0.0316
12:01-13:00, Sun., 11 Feb. 0.0331 0.0294 0.0314
11:01-12:00, Sun., 11 Feb. 0.0334 0.0294 0.0315
10:01-11:00, Sun., 11 Feb. 0.0348 0.0290 0.0317
09:01-10:00, Sun., 11 Feb. 0.0335 0.0301 0.0318
08:01-09:00, Sun., 11 Feb. 0.0335 0.0298 0.0319
07:01-08:00, Sun., 11 Feb. 0.0338 0.0300 0.0319
06:01-07:00, Sun., 11 Feb. 0.0342 0.0307 0.0323
05:01-06:00, Sun., 11 Feb. 0.0340 0.0300 0.0322
04:01-05:00, Sun., 11 Feb. 0.0339 0.0302 0.0321
03:01-04:00, Sun., 11 Feb. 0.0341 0.0301 0.0321
02:01-03:00, Sun., 11 Feb. 0.0340 0.0298 0.0323
01:01-02:00, Sun., 11 Feb. 0.0348 0.0307 0.0326
00:01-01:00, Sun., 11 Feb. 0.0350 0.0312 0.0329
23:01-24:00, Sat., 10 Feb. 0.0368 0.0321 0.0345
22:01-23:00, Sat., 10 Feb. 0.0387 0.0343 0.0361
21:01-22:00, Sat., 10 Feb. 0.0379 0.0335 0.0354
20:01-21:00, Sat., 10 Feb. 0.0371 0.0317 0.0346
19:01-20:00, Sat., 10 Feb. 0.0330 0.0291 0.0311
18:01-19:00, Sat., 10 Feb. 0.0328 0.0296 0.0311
17:01-18:00, Sat., 10 Feb. 0.0328 0.0290 0.0310
16:01-17:00, Sat., 10 Feb. 0.0331 0.0293 0.0311
15:01-16:00, Sat., 10 Feb. 0.0334 0.0288 0.0314
14:01-15:00, Sat., 10 Feb. 0.0341 0.0292 0.0317