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

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. 0.0438 0.0367 0.0401
19:01-20:00, Thu., 20 Sep. 0.0472 0.0371 0.0415
18:01-19:00, Thu., 20 Sep. 0.0465 0.0388 0.0422
17:01-18:00, Thu., 20 Sep. 0.0475 0.0410 0.0443
16:01-17:00, Thu., 20 Sep. 0.0474 0.0408 0.0449
15:01-16:00, Thu., 20 Sep. 0.0477 0.0368 0.0436
14:01-15:00, Thu., 20 Sep. 0.0385 0.0309 0.0344
13:01-14:00, Thu., 20 Sep. 0.0353 0.0298 0.0325
12:01-13:00, Thu., 20 Sep. 0.0348 0.0300 0.0319
11:01-12:00, Thu., 20 Sep. 0.0333 0.0297 0.0314
10:01-11:00, Thu., 20 Sep. 0.0337 0.0296 0.0314
09:01-10:00, Thu., 20 Sep. 0.0335 0.0291 0.0313
08:01-09:00, Thu., 20 Sep. 0.0340 0.0295 0.0316
07:01-08:00, Thu., 20 Sep. 0.0338 0.0299 0.0320
06:01-07:00, Thu., 20 Sep. 0.0336 0.0297 0.0316
05:01-06:00, Thu., 20 Sep. 0.0336 0.0301 0.0320
04:01-05:00, Thu., 20 Sep. 0.0342 0.0309 0.0321
03:01-04:00, Thu., 20 Sep. 0.0341 0.0304 0.0325
02:01-03:00, Thu., 20 Sep. 0.0333 0.0294 0.0317
01:01-02:00, Thu., 20 Sep. 0.0332 0.0300 0.0315
00:01-01:00, Thu., 20 Sep. 0.0339 0.0289 0.0313
23:01-24:00, Wed., 19 Sep. 0.0329 0.0294 0.0310
22:01-23:00, Wed., 19 Sep. 0.0332 0.0284 0.0308
21:01-22:00, Wed., 19 Sep. 0.0333 0.0296 0.0309
20:01-21:00, Wed., 19 Sep. 0.0327 0.0292 0.0310
19:01-20:00, Wed., 19 Sep. 0.0332 0.0294 0.0308
18:01-19:00, Wed., 19 Sep. 0.0332 0.0290 0.0308
17:01-18:00, Wed., 19 Sep. 0.0324 0.0291 0.0310
16:01-17:00, Wed., 19 Sep. 0.0330 0.0288 0.0309
15:01-16:00, Wed., 19 Sep. 0.0332 0.0289 0.0310
14:01-15:00, Wed., 19 Sep. 0.0332 0.0293 0.0310
13:01-14:00, Wed., 19 Sep. 0.0337 0.0283 0.0312
12:01-13:00, Wed., 19 Sep. 0.0327 0.0289 0.0310
11:01-12:00, Wed., 19 Sep. 0.0339 0.0284 0.0310
10:01-11:00, Wed., 19 Sep. 0.0329 0.0292 0.0310
09:01-10:00, Wed., 19 Sep. 0.0339 0.0289 0.0306
08:01-09:00, Wed., 19 Sep. 0.0328 0.0288 0.0307
07:01-08:00, Wed., 19 Sep. 0.0335 0.0285 0.0310
06:01-07:00, Wed., 19 Sep. 0.0332 0.0290 0.0310
05:01-06:00, Wed., 19 Sep. 0.0334 0.0294 0.0313
04:01-05:00, Wed., 19 Sep. 0.0334 0.0299 0.0316
03:01-04:00, Wed., 19 Sep. 0.0335 0.0285 0.0314
02:01-03:00, Wed., 19 Sep. 0.0330 0.0287 0.0311
01:01-02:00, Wed., 19 Sep. 0.0334 0.0276 0.0305
00:01-01:00, Wed., 19 Sep. 0.0326 0.0286 0.0307
23:01-24:00, Tue., 18 Sep. 0.0335 0.0284 0.0305
22:01-23:00, Tue., 18 Sep. 0.0328 0.0288 0.0311
21:01-22:00, Tue., 18 Sep. 0.0325 0.0285 0.0304
20:01-21:00, Tue., 18 Sep. 0.0320 0.0283 0.0302
19:01-20:00, Tue., 18 Sep. 0.0329 0.0286 0.0303
18:01-19:00, Tue., 18 Sep. 0.0322 0.0274 0.0301
17:01-18:00, Tue., 18 Sep. 0.0322 0.0284 0.0303
16:01-17:00, Tue., 18 Sep. 0.0321 0.0286 0.0302
15:01-16:00, Tue., 18 Sep. 0.0320 0.0280 0.0303
14:01-15:00, Tue., 18 Sep. 0.0318 0.0278 0.0298
13:01-14:00, Tue., 18 Sep. 0.0323 0.0284 0.0301
12:01-13:00, Tue., 18 Sep. 0.0321 0.0281 0.0301
11:01-12:00, Tue., 18 Sep. 0.0329 0.0283 0.0302
10:01-11:00, Tue., 18 Sep. 0.0328 0.0286 0.0303
09:01-10:00, Tue., 18 Sep. 0.0326 0.0284 0.0305
08:01-09:00, Tue., 18 Sep. 0.0330 0.0293 0.0310
07:01-08:00, Tue., 18 Sep. 0.0335 0.0296 0.0314
06:01-07:00, Tue., 18 Sep. 0.0333 0.0292 0.0307
05:01-06:00, Tue., 18 Sep. 0.0322 0.0284 0.0304
04:01-05:00, Tue., 18 Sep. 0.0321 0.0283 0.0304
03:01-04:00, Tue., 18 Sep. 0.0331 0.0284 0.0302
02:01-03:00, Tue., 18 Sep. 0.0329 0.0292 0.0309
01:01-02:00, Tue., 18 Sep. 0.0354 0.0303 0.0324
00:01-01:00, Tue., 18 Sep. 0.0402 0.0330 0.0363
23:01-24:00, Mon., 17 Sep. 0.0364 0.0293 0.0329
22:01-23:00, Mon., 17 Sep. 0.0357 0.0298 0.0327
21:01-22:00, Mon., 17 Sep. 0.0344 0.0293 0.0314
20:01-21:00, Mon., 17 Sep. 0.0406 0.0319 0.0351
19:01-20:00, Mon., 17 Sep. 0.0430 0.0333 0.0382
18:01-19:00, Mon., 17 Sep. 0.0402 0.0334 0.0366
17:01-18:00, Mon., 17 Sep. 0.0375 0.0288 0.0318
16:01-17:00, Mon., 17 Sep. 0.0334 0.0290 0.0312
15:01-16:00, Mon., 17 Sep. 0.0338 0.0289 0.0309
14:01-15:00, Mon., 17 Sep. 0.0330 0.0287 0.0309
13:01-14:00, Mon., 17 Sep. 0.0328 0.0291 0.0311
12:01-13:00, Mon., 17 Sep. 0.0330 0.0293 0.0311
11:01-12:00, Mon., 17 Sep. 0.0338 0.0289 0.0312
10:01-11:00, Mon., 17 Sep. 0.0335 0.0290 0.0312
09:01-10:00, Mon., 17 Sep. 0.0339 0.0285 0.0315
08:01-09:00, Mon., 17 Sep. 0.0349 0.0300 0.0323
07:01-08:00, Mon., 17 Sep. 0.0348 0.0308 0.0325
06:01-07:00, Mon., 17 Sep. 0.0351 0.0305 0.0326
05:01-06:00, Mon., 17 Sep. 0.0352 0.0299 0.0324
04:01-05:00, Mon., 17 Sep. 0.0349 0.0304 0.0322
03:01-04:00, Mon., 17 Sep. 0.0350 0.0304 0.0321
02:01-03:00, Mon., 17 Sep. 0.0331 0.0285 0.0314
01:01-02:00, Mon., 17 Sep. 0.0335 0.0287 0.0309
00:01-01:00, Mon., 17 Sep. 0.0323 0.0289 0.0304
23:01-24:00, Sun., 16 Sep. 0.0324 0.0281 0.0300
22:01-23:00, Sun., 16 Sep. 0.0324 0.0284 0.0302
21:01-22:00, Sun., 16 Sep. 0.0324 0.0279 0.0301
20:01-21:00, Sun., 16 Sep. 0.0318 0.0273 0.0301
19:01-20:00, Sun., 16 Sep. 0.0323 0.0284 0.0304
18:01-19:00, Sun., 16 Sep. 0.0327 0.0280 0.0304
17:01-18:00, Sun., 16 Sep. 0.0318 0.0281 0.0301
16:01-17:00, Sun., 16 Sep. 0.0323 0.0282 0.0301
15:01-16:00, Sun., 16 Sep. 0.0320 0.0286 0.0300
14:01-15:00, Sun., 16 Sep. 0.0325 0.0273 0.0301
13:01-14:00, Sun., 16 Sep. 0.0323 0.0277 0.0303
12:01-13:00, Sun., 16 Sep. 0.0319 0.0287 0.0301
11:01-12:00, Sun., 16 Sep. 0.0321 0.0283 0.0299
10:01-11:00, Sun., 16 Sep. 0.0319 0.0274 0.0300
09:01-10:00, Sun., 16 Sep. 0.0319 0.0279 0.0301
08:01-09:00, Sun., 16 Sep. 0.0322 0.0276 0.0301
07:01-08:00, Sun., 16 Sep. 0.0323 0.0281 0.0304
06:01-07:00, Sun., 16 Sep. 0.0318 0.0278 0.0300
05:01-06:00, Sun., 16 Sep. 0.0317 0.0287 0.0303
04:01-05:00, Sun., 16 Sep. 0.0321 0.0288 0.0303
03:01-04:00, Sun., 16 Sep. 0.0322 0.0280 0.0301
02:01-03:00, Sun., 16 Sep. 0.0317 0.0282 0.0302
01:01-02:00, Sun., 16 Sep. 0.0326 0.0287 0.0304
00:01-01:00, Sun., 16 Sep. 0.0330 0.0270 0.0302
23:01-24:00, Sat., 15 Sep. 0.0323 0.0286 0.0302
22:01-23:00, Sat., 15 Sep. 0.0321 0.0283 0.0300
21:01-22:00, Sat., 15 Sep. 0.0321 0.0283 0.0301
20:01-21:00, Sat., 15 Sep. 0.0320 0.0276 0.0297
19:01-20:00, Sat., 15 Sep. 0.0316 0.0273 0.0294
18:01-19:00, Sat., 15 Sep. 0.0322 0.0276 0.0299
17:01-18:00, Sat., 15 Sep. 0.0323 0.0281 0.0298
16:01-17:00, Sat., 15 Sep. 0.0323 0.0281 0.0302
15:01-16:00, Sat., 15 Sep. 0.0329 0.0288 0.0311
14:01-15:00, Sat., 15 Sep. 0.0340 0.0305 0.0323
13:01-14:00, Sat., 15 Sep. 0.0351 0.0300 0.0329
12:01-13:00, Sat., 15 Sep. 0.0356 0.0310 0.0336
11:01-12:00, Sat., 15 Sep. 0.0345 0.0309 0.0327
10:01-11:00, Sat., 15 Sep. 0.0358 0.0310 0.0336
09:01-10:00, Sat., 15 Sep. 0.0379 0.0325 0.0349
08:01-09:00, Sat., 15 Sep. 0.0402 0.0336 0.0363
07:01-08:00, Sat., 15 Sep. 0.0400 0.0305 0.0344
06:01-07:00, Sat., 15 Sep. 0.0329 0.0288 0.0306
05:01-06:00, Sat., 15 Sep. 0.0340 0.0287 0.0306
04:01-05:00, Sat., 15 Sep. 0.0320 0.0285 0.0303
03:01-04:00, Sat., 15 Sep. 0.0330 0.0292 0.0312
02:01-03:00, Sat., 15 Sep. 0.0344 0.0298 0.0318
01:01-02:00, Sat., 15 Sep. 0.0346 0.0298 0.0322
00:01-01:00, Sat., 15 Sep. 0.0339 0.0296 0.0315
23:01-24:00, Fri., 14 Sep. 0.0333 0.0294 0.0316
22:01-23:00, Fri., 14 Sep. 0.0329 0.0291 0.0312
21:01-22:00, Fri., 14 Sep. 0.0333 0.0288 0.0313
20:01-21:00, Fri., 14 Sep. 0.0321 0.0281 0.0303
19:01-20:00, Fri., 14 Sep. 0.0321 0.0280 0.0299
18:01-19:00, Fri., 14 Sep. 0.0315 0.0281 0.0299
17:01-18:00, Fri., 14 Sep. 0.0311 0.0278 0.0297
16:01-17:00, Fri., 14 Sep. 0.0315 0.0280 0.0298
15:01-16:00, Fri., 14 Sep. 0.0322 0.0283 0.0299
14:01-15:00, Fri., 14 Sep. 0.0323 0.0276 0.0304
13:01-14:00, Fri., 14 Sep. 0.0343 0.0294 0.0318
12:01-13:00, Fri., 14 Sep. 0.0356 0.0285 0.0317
11:01-12:00, Fri., 14 Sep. 0.0325 0.0283 0.0303
10:01-11:00, Fri., 14 Sep. 0.0325 0.0284 0.0305
09:01-10:00, Fri., 14 Sep. 0.0332 0.0289 0.0311
08:01-09:00, Fri., 14 Sep. 0.0340 0.0297 0.0319
07:01-08:00, Fri., 14 Sep. 0.0347 0.0302 0.0327
06:01-07:00, Fri., 14 Sep. 0.0337 0.0297 0.0321
05:01-06:00, Fri., 14 Sep. 0.0333 0.0292 0.0315
04:01-05:00, Fri., 14 Sep. 0.0333 0.0291 0.0310
03:01-04:00, Fri., 14 Sep. 0.0346 0.0298 0.0312
02:01-03:00, Fri., 14 Sep. 0.0345 0.0296 0.0317
01:01-02:00, Fri., 14 Sep. 0.0351 0.0302 0.0322
00:01-01:00, Fri., 14 Sep. 0.0345 0.0306 0.0323
23:01-24:00, Thu., 13 Sep. 0.0357 0.0301 0.0329
22:01-23:00, Thu., 13 Sep. 0.0338 0.0302 0.0320
21:01-22:00, Thu., 13 Sep. 0.0342 0.0300 0.0318
20:01-21:00, Thu., 13 Sep. 0.0332 0.0288 0.0311
19:01-20:00, Thu., 13 Sep. 0.0335 0.0285 0.0306
18:01-19:00, Thu., 13 Sep. 0.0326 0.0289 0.0304
17:01-18:00, Thu., 13 Sep. 0.0326 0.0290 0.0305
16:01-17:00, Thu., 13 Sep. 0.0325 0.0288 0.0306
15:01-16:00, Thu., 13 Sep. 0.0322 0.0280 0.0302
14:01-15:00, Thu., 13 Sep. 0.0323 0.0280 0.0303
13:01-14:00, Thu., 13 Sep. 0.0324 0.0281 0.0306
12:01-13:00, Thu., 13 Sep. 0.0327 0.0277 0.0303
11:01-12:00, Thu., 13 Sep. 0.0324 0.0288 0.0304
10:01-11:00, Thu., 13 Sep. 0.0323 0.0276 0.0302
09:01-10:00, Thu., 13 Sep. 0.0329 0.0274 0.0302
08:01-09:00, Thu., 13 Sep. 0.0326 0.0293 0.0307
07:01-08:00, Thu., 13 Sep. 0.0338 0.0293 0.0314
06:01-07:00, Thu., 13 Sep. 0.0333 0.0298 0.0315
05:01-06:00, Thu., 13 Sep. 0.0329 0.0289 0.0311
04:01-05:00, Thu., 13 Sep. 0.0321 0.0283 0.0305
03:01-04:00, Thu., 13 Sep. 0.0331 0.0278 0.0308
02:01-03:00, Thu., 13 Sep. 0.0332 0.0289 0.0308
01:01-02:00, Thu., 13 Sep. 0.0333 0.0286 0.0310
00:01-01:00, Thu., 13 Sep. 0.0329 0.0295 0.0310
23:01-24:00, Wed., 12 Sep. 0.0330 0.0292 0.0311
22:01-23:00, Wed., 12 Sep. 0.0334 0.0282 0.0311
21:01-22:00, Wed., 12 Sep. 0.0328 0.0290 0.0308
20:01-21:00, Wed., 12 Sep. 0.0335 0.0293 0.0313
19:01-20:00, Wed., 12 Sep. 0.0323 0.0278 0.0301
18:01-19:00, Wed., 12 Sep. 0.0322 0.0285 0.0303
17:01-18:00, Wed., 12 Sep. 0.0322 0.0282 0.0303
16:01-17:00, Wed., 12 Sep. 0.0319 0.0282 0.0301
15:01-16:00, Wed., 12 Sep. 0.0330 0.0279 0.0299
14:01-15:00, Wed., 12 Sep. 0.0319 0.0271 0.0300
13:01-14:00, Wed., 12 Sep. 0.0320 0.0281 0.0300
12:01-13:00, Wed., 12 Sep. 0.0329 0.0285 0.0302
11:01-12:00, Wed., 12 Sep. 0.0320 0.0283 0.0299
10:01-11:00, Wed., 12 Sep. 0.0317 0.0277 0.0300
09:01-10:00, Wed., 12 Sep. 0.0323 0.0274 0.0300
08:01-09:00, Wed., 12 Sep. 0.0323 0.0285 0.0302
07:01-08:00, Wed., 12 Sep. 0.0323 0.0286 0.0304
06:01-07:00, Wed., 12 Sep. 0.0321 0.0280 0.0301
05:01-06:00, Wed., 12 Sep. 0.0321 0.0283 0.0300
04:01-05:00, Wed., 12 Sep. 0.0322 0.0281 0.0300
03:01-04:00, Wed., 12 Sep. 0.0320 0.0274 0.0303
02:01-03:00, Wed., 12 Sep. 0.0316 0.0283 0.0299
01:01-02:00, Wed., 12 Sep. 0.0323 0.0281 0.0298
00:01-01:00, Wed., 12 Sep. 0.0321 0.0276 0.0297
23:01-24:00, Tue., 11 Sep. 0.0323 0.0278 0.0300
22:01-23:00, Tue., 11 Sep. 0.0323 0.0285 0.0299
21:01-22:00, Tue., 11 Sep. 0.0318 0.0280 0.0297
20:01-21:00, Tue., 11 Sep. 0.0319 0.0281 0.0298
19:01-20:00, Tue., 11 Sep. 0.0321 0.0278 0.0299
18:01-19:00, Tue., 11 Sep. 0.0323 0.0278 0.0299
17:01-18:00, Tue., 11 Sep. 0.0322 0.0278 0.0300
16:01-17:00, Tue., 11 Sep. 0.0317 0.0282 0.0301
15:01-16:00, Tue., 11 Sep. 0.0320 0.0285 0.0302
14:01-15:00, Tue., 11 Sep. 0.0317 0.0276 0.0300
13:01-14:00, Tue., 11 Sep. 0.0331 0.0281 0.0302
12:01-13:00, Tue., 11 Sep. 0.0325 0.0283 0.0302
11:01-12:00, Tue., 11 Sep. 0.0322 0.0282 0.0305
10:01-11:00, Tue., 11 Sep. 0.0331 0.0291 0.0313
09:01-10:00, Tue., 11 Sep. 0.0368 0.0302 0.0335
08:01-09:00, Tue., 11 Sep. 0.0344 0.0286 0.0311
07:01-08:00, Tue., 11 Sep. 0.0325 0.0275 0.0302
06:01-07:00, Tue., 11 Sep. 0.0337 0.0295 0.0312
05:01-06:00, Tue., 11 Sep. 0.0390 0.0299 0.0338
04:01-05:00, Tue., 11 Sep. 0.0415 0.0351 0.0378
03:01-04:00, Tue., 11 Sep. 0.0360 0.0288 0.0319
02:01-03:00, Tue., 11 Sep. 0.0342 0.0296 0.0318
01:01-02:00, Tue., 11 Sep. 0.0386 0.0314 0.0349
00:01-01:00, Tue., 11 Sep. 0.0423 0.0352 0.0382
23:01-24:00, Mon., 10 Sep. 0.0385 0.0316 0.0350
22:01-23:00, Mon., 10 Sep. 0.0356 0.0307 0.0334
21:01-22:00, Mon., 10 Sep. 0.0371 0.0333 0.0350