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
08:01-09:00, Sat., 23 Jun. 0.0340 0.0297 0.0315
07:01-08:00, Sat., 23 Jun. 0.0333 0.0293 0.0314
06:01-07:00, Sat., 23 Jun. 0.0336 0.0305 0.0318
05:01-06:00, Sat., 23 Jun. 0.0336 0.0301 0.0318
04:01-05:00, Sat., 23 Jun. 0.0339 0.0300 0.0318
03:01-04:00, Sat., 23 Jun. 0.0340 0.0300 0.0320
02:01-03:00, Sat., 23 Jun. 0.0343 0.0307 0.0323
01:01-02:00, Sat., 23 Jun. 0.0351 0.0303 0.0327
00:01-01:00, Sat., 23 Jun. 0.0342 0.0296 0.0324
23:01-24:00, Fri., 22 Jun. 0.0340 0.0299 0.0324
22:01-23:00, Fri., 22 Jun. 0.0342 0.0292 0.0319
21:01-22:00, Fri., 22 Jun. 0.0345 0.0294 0.0317
20:01-21:00, Fri., 22 Jun. 0.0332 0.0293 0.0312
19:01-20:00, Fri., 22 Jun. 0.0332 0.0290 0.0312
18:01-19:00, Fri., 22 Jun. 0.0336 0.0291 0.0314
17:01-18:00, Fri., 22 Jun. 0.0330 0.0288 0.0313
16:01-17:00, Fri., 22 Jun. 0.0332 0.0291 0.0310
15:01-16:00, Fri., 22 Jun. 0.0332 0.0290 0.0313
14:01-15:00, Fri., 22 Jun. 0.0338 0.0296 0.0314
13:01-14:00, Fri., 22 Jun. 0.0334 0.0297 0.0314
12:01-13:00, Fri., 22 Jun. 0.0335 0.0296 0.0313
11:01-12:00, Fri., 22 Jun. 0.0338 0.0293 0.0311
10:01-11:00, Fri., 22 Jun. 0.0334 0.0290 0.0312
09:01-10:00, Fri., 22 Jun. 0.0337 0.0291 0.0315
08:01-09:00, Fri., 22 Jun. 0.0337 0.0297 0.0316
07:01-08:00, Fri., 22 Jun. 0.0346 0.0304 0.0324
06:01-07:00, Fri., 22 Jun. 0.0340 0.0305 0.0323
05:01-06:00, Fri., 22 Jun. 0.0347 0.0307 0.0324
04:01-05:00, Fri., 22 Jun. 0.0347 0.0301 0.0325
03:01-04:00, Fri., 22 Jun. 0.0339 0.0301 0.0321
02:01-03:00, Fri., 22 Jun. 0.0336 0.0297 0.0315
01:01-02:00, Fri., 22 Jun. 0.0341 0.0289 0.0314
00:01-01:00, Fri., 22 Jun. 0.0332 0.0294 0.0312
23:01-24:00, Thu., 21 Jun. 0.0335 0.0295 0.0314
22:01-23:00, Thu., 21 Jun. 0.0332 0.0295 0.0309
21:01-22:00, Thu., 21 Jun. 0.0324 0.0286 0.0307
20:01-21:00, Thu., 21 Jun. 0.0336 0.0296 0.0309
19:01-20:00, Thu., 21 Jun. 0.0325 0.0279 0.0306
18:01-19:00, Thu., 21 Jun. 0.0340 0.0285 0.0308
17:01-18:00, Thu., 21 Jun. 0.0327 0.0289 0.0304
16:01-17:00, Thu., 21 Jun. 0.0324 0.0285 0.0305
15:01-16:00, Thu., 21 Jun. 0.0327 0.0290 0.0305
14:01-15:00, Thu., 21 Jun. 0.0327 0.0276 0.0304
13:01-14:00, Thu., 21 Jun. 0.0327 0.0285 0.0305
12:01-13:00, Thu., 21 Jun. 0.0327 0.0286 0.0305
11:01-12:00, Thu., 21 Jun. 0.0327 0.0287 0.0305
10:01-11:00, Thu., 21 Jun. 0.0321 0.0276 0.0304
09:01-10:00, Thu., 21 Jun. 0.0331 0.0284 0.0305
08:01-09:00, Thu., 21 Jun. 0.0323 0.0282 0.0302
07:01-08:00, Thu., 21 Jun. 0.0322 0.0286 0.0305
06:01-07:00, Thu., 21 Jun. 0.0333 0.0289 0.0307
05:01-06:00, Thu., 21 Jun. 0.0342 0.0299 0.0319
04:01-05:00, Thu., 21 Jun. 0.0368 0.0313 0.0345
03:01-04:00, Thu., 21 Jun. 0.0361 0.0303 0.0330
02:01-03:00, Thu., 21 Jun. 0.0332 0.0294 0.0315
01:01-02:00, Thu., 21 Jun. 0.0336 0.0288 0.0311
00:01-01:00, Thu., 21 Jun. 0.0352 0.0311 0.0328
23:01-24:00, Wed., 20 Jun. 0.0436 0.0331 0.0371
22:01-23:00, Wed., 20 Jun. 0.0434 0.0370 0.0404
21:01-22:00, Wed., 20 Jun. 0.0399 0.0323 0.0355
20:01-21:00, Wed., 20 Jun. 0.0365 0.0311 0.0346
19:01-20:00, Wed., 20 Jun. 0.0354 0.0315 0.0334
18:01-19:00, Wed., 20 Jun. 0.0348 0.0299 0.0318
17:01-18:00, Wed., 20 Jun. 0.0328 0.0279 0.0305
16:01-17:00, Wed., 20 Jun. 0.0334 0.0279 0.0309
15:01-16:00, Wed., 20 Jun. 0.0347 0.0294 0.0314
14:01-15:00, Wed., 20 Jun. 0.0350 0.0300 0.0320
13:01-14:00, Wed., 20 Jun. 0.0345 0.0289 0.0317
12:01-13:00, Wed., 20 Jun. 0.0365 0.0302 0.0329
11:01-12:00, Wed., 20 Jun. 0.0370 0.0324 0.0352
10:01-11:00, Wed., 20 Jun. 0.0362 0.0323 0.0346
09:01-10:00, Wed., 20 Jun. 0.0362 0.0302 0.0338
08:01-09:00, Wed., 20 Jun. 0.0370 0.0325 0.0346
07:01-08:00, Wed., 20 Jun. 0.0367 0.0324 0.0342
06:01-07:00, Wed., 20 Jun. 0.0356 0.0302 0.0326
05:01-06:00, Wed., 20 Jun. 0.0365 0.0310 0.0337
04:01-05:00, Wed., 20 Jun. 0.0366 0.0319 0.0344
03:01-04:00, Wed., 20 Jun. 0.0358 0.0293 0.0321
02:01-03:00, Wed., 20 Jun. 0.0335 0.0296 0.0314
01:01-02:00, Wed., 20 Jun. 0.0330 0.0285 0.0311
00:01-01:00, Wed., 20 Jun. 0.0328 0.0279 0.0309
23:01-24:00, Tue., 19 Jun. 0.0329 0.0290 0.0310
22:01-23:00, Tue., 19 Jun. 0.0333 0.0288 0.0310
21:01-22:00, Tue., 19 Jun. 0.0326 0.0287 0.0308
20:01-21:00, Tue., 19 Jun. 0.0340 0.0295 0.0312
19:01-20:00, Tue., 19 Jun. 0.0330 0.0291 0.0310
18:01-19:00, Tue., 19 Jun. 0.0329 0.0290 0.0308
17:01-18:00, Tue., 19 Jun. 0.0335 0.0295 0.0311
16:01-17:00, Tue., 19 Jun. 0.0331 0.0290 0.0310
15:01-16:00, Tue., 19 Jun. 0.0324 0.0291 0.0310
14:01-15:00, Tue., 19 Jun. 0.0330 0.0286 0.0307
13:01-14:00, Tue., 19 Jun. 0.0332 0.0285 0.0308
12:01-13:00, Tue., 19 Jun. 0.0332 0.0286 0.0306
11:01-12:00, Tue., 19 Jun. 0.0332 0.0283 0.0306
10:01-11:00, Tue., 19 Jun. 0.0334 0.0284 0.0305
09:01-10:00, Tue., 19 Jun. 0.0329 0.0287 0.0308
08:01-09:00, Tue., 19 Jun. 0.0338 0.0292 0.0312
07:01-08:00, Tue., 19 Jun. 0.0338 0.0299 0.0316
06:01-07:00, Tue., 19 Jun. 0.0334 0.0297 0.0313
05:01-06:00, Tue., 19 Jun. 0.0337 0.0290 0.0315
04:01-05:00, Tue., 19 Jun. 0.0342 0.0294 0.0319
03:01-04:00, Tue., 19 Jun. 0.0340 0.0301 0.0321
02:01-03:00, Tue., 19 Jun. 0.0341 0.0298 0.0317
01:01-02:00, Tue., 19 Jun. 0.0335 0.0300 0.0319
00:01-01:00, Tue., 19 Jun. 0.0341 0.0302 0.0322
23:01-24:00, Mon., 18 Jun. 0.0350 0.0301 0.0327
22:01-23:00, Mon., 18 Jun. 0.0337 0.0288 0.0316
21:01-22:00, Mon., 18 Jun. 0.0332 0.0293 0.0315
20:01-21:00, Mon., 18 Jun. 0.0330 0.0295 0.0314
19:01-20:00, Mon., 18 Jun. 0.0335 0.0293 0.0317
18:01-19:00, Mon., 18 Jun. 0.0342 0.0297 0.0319
17:01-18:00, Mon., 18 Jun. 0.0342 0.0302 0.0315
16:01-17:00, Mon., 18 Jun. 0.0332 0.0290 0.0313
15:01-16:00, Mon., 18 Jun. 0.0347 0.0294 0.0322
14:01-15:00, Mon., 18 Jun. 0.0342 0.0295 0.0318
13:01-14:00, Mon., 18 Jun. 0.0330 0.0291 0.0309
12:01-13:00, Mon., 18 Jun. 0.0334 0.0293 0.0309
11:01-12:00, Mon., 18 Jun. 0.0332 0.0293 0.0311
10:01-11:00, Mon., 18 Jun. 0.0335 0.0294 0.0312
09:01-10:00, Mon., 18 Jun. 0.0338 0.0287 0.0310
08:01-09:00, Mon., 18 Jun. 0.0334 0.0283 0.0312
07:01-08:00, Mon., 18 Jun. 0.0339 0.0290 0.0318
06:01-07:00, Mon., 18 Jun. 0.0335 0.0294 0.0316
05:01-06:00, Mon., 18 Jun. 0.0331 0.0296 0.0315
04:01-05:00, Mon., 18 Jun. 0.0346 0.0295 0.0314
03:01-04:00, Mon., 18 Jun. 0.0338 0.0300 0.0319
02:01-03:00, Mon., 18 Jun. 0.0341 0.0290 0.0314
01:01-02:00, Mon., 18 Jun. 0.0337 0.0299 0.0317
00:01-01:00, Mon., 18 Jun. 0.0337 0.0290 0.0312
23:01-24:00, Sun., 17 Jun. 0.0329 0.0292 0.0311
22:01-23:00, Sun., 17 Jun. 0.0321 0.0286 0.0305
21:01-22:00, Sun., 17 Jun. 0.0322 0.0285 0.0303
20:01-21:00, Sun., 17 Jun. 0.0324 0.0278 0.0304
19:01-20:00, Sun., 17 Jun. 0.0324 0.0284 0.0304
18:01-19:00, Sun., 17 Jun. 0.0317 0.0283 0.0304
17:01-18:00, Sun., 17 Jun. 0.0325 0.0281 0.0305
16:01-17:00, Sun., 17 Jun. 0.0330 0.0286 0.0303
15:01-16:00, Sun., 17 Jun. 0.0325 0.0287 0.0304
14:01-15:00, Sun., 17 Jun. 0.0327 0.0289 0.0306
13:01-14:00, Sun., 17 Jun. 0.0329 0.0288 0.0304
12:01-13:00, Sun., 17 Jun. 0.0323 0.0286 0.0302
11:01-12:00, Sun., 17 Jun. 0.0326 0.0282 0.0304
10:01-11:00, Sun., 17 Jun. 0.0324 0.0282 0.0304
09:01-10:00, Sun., 17 Jun. 0.0324 0.0281 0.0303
08:01-09:00, Sun., 17 Jun. 0.0324 0.0284 0.0305
07:01-08:00, Sun., 17 Jun. 0.0324 0.0292 0.0306
06:01-07:00, Sun., 17 Jun. 0.0326 0.0286 0.0305
05:01-06:00, Sun., 17 Jun. 0.0322 0.0282 0.0303
04:01-05:00, Sun., 17 Jun. 0.0327 0.0290 0.0305
03:01-04:00, Sun., 17 Jun. 0.0323 0.0285 0.0305
02:01-03:00, Sun., 17 Jun. 0.0326 0.0288 0.0305
01:01-02:00, Sun., 17 Jun. 0.0325 0.0288 0.0304
00:01-01:00, Sun., 17 Jun. 0.0322 0.0279 0.0303
23:01-24:00, Sat., 16 Jun. 0.0324 0.0279 0.0301
22:01-23:00, Sat., 16 Jun. 0.0331 0.0274 0.0301
21:01-22:00, Sat., 16 Jun. 0.0323 0.0285 0.0302
20:01-21:00, Sat., 16 Jun. 0.0320 0.0279 0.0301
19:01-20:00, Sat., 16 Jun. 0.0328 0.0283 0.0307
18:01-19:00, Sat., 16 Jun. 0.0331 0.0284 0.0308
17:01-18:00, Sat., 16 Jun. 0.0331 0.0290 0.0306
16:01-17:00, Sat., 16 Jun. 0.0327 0.0285 0.0302
15:01-16:00, Sat., 16 Jun. 0.0325 0.0288 0.0302
14:01-15:00, Sat., 16 Jun. 0.0333 0.0282 0.0302
13:01-14:00, Sat., 16 Jun. 0.0318 0.0274 0.0297
12:01-13:00, Sat., 16 Jun. 0.0317 0.0280 0.0301
11:01-12:00, Sat., 16 Jun. 0.0321 0.0285 0.0303
10:01-11:00, Sat., 16 Jun. 0.0330 0.0284 0.0306
09:01-10:00, Sat., 16 Jun. 0.0329 0.0294 0.0313
08:01-09:00, Sat., 16 Jun. 0.0334 0.0286 0.0312
07:01-08:00, Sat., 16 Jun. 0.0337 0.0305 0.0320
06:01-07:00, Sat., 16 Jun. 0.0341 0.0299 0.0322
05:01-06:00, Sat., 16 Jun. 0.0353 0.0299 0.0321
04:01-05:00, Sat., 16 Jun. 0.0343 0.0298 0.0321
03:01-04:00, Sat., 16 Jun. 0.0353 0.0303 0.0323
02:01-03:00, Sat., 16 Jun. 0.0343 0.0292 0.0324
01:01-02:00, Sat., 16 Jun. 0.0340 0.0290 0.0312
00:01-01:00, Sat., 16 Jun. 0.0332 0.0284 0.0311
23:01-24:00, Fri., 15 Jun. 0.0329 0.0291 0.0309
22:01-23:00, Fri., 15 Jun. 0.0338 0.0291 0.0314
21:01-22:00, Fri., 15 Jun. 0.0365 0.0306 0.0333
20:01-21:00, Fri., 15 Jun. 0.0386 0.0341 0.0362
19:01-20:00, Fri., 15 Jun. 0.0388 0.0323 0.0353
18:01-19:00, Fri., 15 Jun. 0.0379 0.0320 0.0350
17:01-18:00, Fri., 15 Jun. 0.0408 0.0341 0.0361
16:01-17:00, Fri., 15 Jun. 0.0373 0.0320 0.0346
15:01-16:00, Fri., 15 Jun. 0.0366 0.0325 0.0344
14:01-15:00, Fri., 15 Jun. 0.0379 0.0322 0.0353
13:01-14:00, Fri., 15 Jun. 0.0392 0.0342 0.0362
12:01-13:00, Fri., 15 Jun. 0.0374 0.0336 0.0357
11:01-12:00, Fri., 15 Jun. 0.0361 0.0314 0.0334
10:01-11:00, Fri., 15 Jun. 0.0349 0.0296 0.0316
09:01-10:00, Fri., 15 Jun. 0.0342 0.0290 0.0309
08:01-09:00, Fri., 15 Jun. 0.0332 0.0294 0.0312
07:01-08:00, Fri., 15 Jun. 0.0337 0.0284 0.0307
06:01-07:00, Fri., 15 Jun. 0.0332 0.0284 0.0308
05:01-06:00, Fri., 15 Jun. 0.0328 0.0295 0.0308
04:01-05:00, Fri., 15 Jun. 0.0325 0.0286 0.0306
03:01-04:00, Fri., 15 Jun. 0.0324 0.0281 0.0306
02:01-03:00, Fri., 15 Jun. 0.0336 0.0291 0.0310
01:01-02:00, Fri., 15 Jun. 0.0327 0.0282 0.0309
00:01-01:00, Fri., 15 Jun. 0.0332 0.0288 0.0309
23:01-24:00, Thu., 14 Jun. 0.0335 0.0299 0.0317
22:01-23:00, Thu., 14 Jun. 0.0338 0.0296 0.0317
21:01-22:00, Thu., 14 Jun. 0.0333 0.0299 0.0314
20:01-21:00, Thu., 14 Jun. 0.0350 0.0305 0.0321
19:01-20:00, Thu., 14 Jun. 0.0341 0.0292 0.0315
18:01-19:00, Thu., 14 Jun. 0.0329 0.0286 0.0310
17:01-18:00, Thu., 14 Jun. 0.0332 0.0282 0.0310
16:01-17:00, Thu., 14 Jun. 0.0334 0.0273 0.0309
15:01-16:00, Thu., 14 Jun. 0.0343 0.0285 0.0310
14:01-15:00, Thu., 14 Jun. 0.0324 0.0288 0.0309
13:01-14:00, Thu., 14 Jun. 0.0340 0.0290 0.0308
12:01-13:00, Thu., 14 Jun. 0.0326 0.0285 0.0307
11:01-12:00, Thu., 14 Jun. 0.0330 0.0294 0.0311
10:01-11:00, Thu., 14 Jun. 0.0330 0.0291 0.0313
09:01-10:00, Thu., 14 Jun. 0.0334 0.0293 0.0314
08:01-09:00, Thu., 14 Jun. 0.0327 0.0292 0.0314
07:01-08:00, Thu., 14 Jun. 0.0333 0.0296 0.0313
06:01-07:00, Thu., 14 Jun. 0.0333 0.0290 0.0316
05:01-06:00, Thu., 14 Jun. 0.0323 0.0290 0.0310
04:01-05:00, Thu., 14 Jun. 0.0331 0.0292 0.0311
03:01-04:00, Thu., 14 Jun. 0.0334 0.0294 0.0312
02:01-03:00, Thu., 14 Jun. 0.0334 0.0290 0.0313
01:01-02:00, Thu., 14 Jun. 0.0331 0.0289 0.0310
00:01-01:00, Thu., 14 Jun. 0.0339 0.0290 0.0310
23:01-24:00, Wed., 13 Jun. 0.0321 0.0287 0.0305
22:01-23:00, Wed., 13 Jun. 0.0330 0.0285 0.0308
21:01-22:00, Wed., 13 Jun. 0.0324 0.0287 0.0306
20:01-21:00, Wed., 13 Jun. 0.0322 0.0276 0.0306
19:01-20:00, Wed., 13 Jun. 0.0335 0.0284 0.0308
18:01-19:00, Wed., 13 Jun. 0.0339 0.0289 0.0310
17:01-18:00, Wed., 13 Jun. 0.0326 0.0292 0.0308
16:01-17:00, Wed., 13 Jun. 0.0327 0.0285 0.0311
15:01-16:00, Wed., 13 Jun. 0.0329 0.0290 0.0309
14:01-15:00, Wed., 13 Jun. 0.0334 0.0288 0.0310
13:01-14:00, Wed., 13 Jun. 0.0334 0.0290 0.0310
12:01-13:00, Wed., 13 Jun. 0.0331 0.0292 0.0310
11:01-12:00, Wed., 13 Jun. 0.0333 0.0290 0.0310
10:01-11:00, Wed., 13 Jun. 0.0326 0.0289 0.0310
09:01-10:00, Wed., 13 Jun. 0.0337 0.0286 0.0309