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 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. 0.0341 0.0295 0.0324
12:01-13:00, Tue., 20 Feb. 0.0340 0.0302 0.0325
11:01-12:00, Tue., 20 Feb. 0.0344 0.0308 0.0325
10:01-11:00, Tue., 20 Feb. 0.0353 0.0308 0.0327
09:01-10:00, Tue., 20 Feb. 0.0349 0.0312 0.0330
08:01-09:00, Tue., 20 Feb. 0.0351 0.0311 0.0327
07:01-08:00, Tue., 20 Feb. 0.0350 0.0310 0.0327
06:01-07:00, Tue., 20 Feb. 0.0348 0.0309 0.0327
05:01-06:00, Tue., 20 Feb. 0.0342 0.0288 0.0319
04:01-05:00, Tue., 20 Feb. 0.0344 0.0302 0.0321
03:01-04:00, Tue., 20 Feb. 0.0340 0.0290 0.0320
02:01-03:00, Tue., 20 Feb. 0.0348 0.0301 0.0321
01:01-02:00, Tue., 20 Feb. 0.0344 0.0296 0.0325
00:01-01:00, Tue., 20 Feb. 0.0354 0.0303 0.0325
23:01-24:00, Mon., 19 Feb. 0.0341 0.0306 0.0326
22:01-23:00, Mon., 19 Feb. 0.0339 0.0299 0.0322
21:01-22:00, Mon., 19 Feb. 0.0339 0.0297 0.0319
20:01-21:00, Mon., 19 Feb. 0.0337 0.0304 0.0319
19:01-20:00, Mon., 19 Feb. 0.0331 0.0295 0.0315
18:01-19:00, Mon., 19 Feb. 0.0337 0.0301 0.0316
17:01-18:00, Mon., 19 Feb. 0.0337 0.0292 0.0314
16:01-17:00, Mon., 19 Feb. 0.0340 0.0295 0.0315
15:01-16:00, Mon., 19 Feb. 0.0336 0.0291 0.0318
14:01-15:00, Mon., 19 Feb. 0.0342 0.0295 0.0317
13:01-14:00, Mon., 19 Feb. 0.0328 0.0298 0.0315
12:01-13:00, Mon., 19 Feb. 0.0339 0.0296 0.0318
11:01-12:00, Mon., 19 Feb. 0.0346 0.0302 0.0322
10:01-11:00, Mon., 19 Feb. 0.0355 0.0310 0.0328
09:01-10:00, Mon., 19 Feb. 0.0352 0.0306 0.0334
08:01-09:00, Mon., 19 Feb. 0.0359 0.0314 0.0334
07:01-08:00, Mon., 19 Feb. 0.0360 0.0320 0.0337
06:01-07:00, Mon., 19 Feb. 0.0367 0.0314 0.0338
05:01-06:00, Mon., 19 Feb. 0.0353 0.0317 0.0336
04:01-05:00, Mon., 19 Feb. 0.0357 0.0313 0.0336
03:01-04:00, Mon., 19 Feb. 0.0355 0.0315 0.0337
02:01-03:00, Mon., 19 Feb. 0.0342 0.0303 0.0324
01:01-02:00, Mon., 19 Feb. 0.0340 0.0300 0.0321
00:01-01:00, Mon., 19 Feb. 0.0333 0.0295 0.0315
23:01-24:00, Sun., 18 Feb. 0.0334 0.0295 0.0312
22:01-23:00, Sun., 18 Feb. 0.0338 0.0289 0.0313
21:01-22:00, Sun., 18 Feb. 0.0334 0.0290 0.0313
20:01-21:00, Sun., 18 Feb. 0.0329 0.0292 0.0313
19:01-20:00, Sun., 18 Feb. 0.0339 0.0293 0.0312
18:01-19:00, Sun., 18 Feb. 0.0328 0.0296 0.0313
17:01-18:00, Sun., 18 Feb. 0.0349 0.0297 0.0311
11:01-12:00, Sun., 18 Feb. 0.0332 0.0305 0.0318
10:01-11:00, Sun., 18 Feb. 0.0339 0.0296 0.0318
09:01-10:00, Sun., 18 Feb. 0.0334 0.0297 0.0316
08:01-09:00, Sun., 18 Feb. 0.0340 0.0300 0.0318
07:01-08:00, Sun., 18 Feb. 0.0336 0.0301 0.0318
06:01-07:00, Sun., 18 Feb. 0.0337 0.0295 0.0314
05:01-06:00, Sun., 18 Feb. 0.0349 0.0297 0.0316
04:01-05:00, Sun., 18 Feb. 0.0334 0.0296 0.0315
03:01-04:00, Sun., 18 Feb. 0.0337 0.0299 0.0320
02:01-03:00, Sun., 18 Feb. 0.0336 0.0288 0.0317
01:01-02:00, Sun., 18 Feb. 0.0337 0.0297 0.0318
00:01-01:00, Sun., 18 Feb. 0.0350 0.0299 0.0318
23:01-24:00, Sat., 17 Feb. 0.0337 0.0297 0.0318
22:01-23:00, Sat., 17 Feb. 0.0342 0.0307 0.0320
21:01-22:00, Sat., 17 Feb. 0.0344 0.0295 0.0319
20:01-21:00, Sat., 17 Feb. 0.0344 0.0300 0.0322
19:01-20:00, Sat., 17 Feb. 0.0344 0.0305 0.0319
18:01-19:00, Sat., 17 Feb. 0.0341 0.0296 0.0321
17:01-18:00, Sat., 17 Feb. 0.0342 0.0306 0.0324
16:01-17:00, Sat., 17 Feb. 0.0342 0.0304 0.0322
15:01-16:00, Sat., 17 Feb. 0.0342 0.0302 0.0321
14:01-15:00, Sat., 17 Feb. 0.0342 0.0298 0.0321
13:01-14:00, Sat., 17 Feb. 0.0338 0.0299 0.0316
12:01-13:00, Sat., 17 Feb. 0.0335 0.0293 0.0313
11:01-12:00, Sat., 17 Feb. 0.0335 0.0299 0.0316
10:01-11:00, Sat., 17 Feb. 0.0336 0.0294 0.0314
09:01-10:00, Sat., 17 Feb. 0.0333 0.0289 0.0314
08:01-09:00, Sat., 17 Feb. 0.0333 0.0293 0.0314
07:01-08:00, Sat., 17 Feb. 0.0334 0.0293 0.0314
06:01-07:00, Sat., 17 Feb. 0.0334 0.0296 0.0314
05:01-06:00, Sat., 17 Feb. 0.0338 0.0288 0.0314
04:01-05:00, Sat., 17 Feb. 0.0327 0.0296 0.0311
03:01-04:00, Sat., 17 Feb. 0.0345 0.0298 0.0315
02:01-03:00, Sat., 17 Feb. 0.0333 0.0291 0.0311
01:01-02:00, Sat., 17 Feb. 0.0337 0.0293 0.0313
00:01-01:00, Sat., 17 Feb. 0.0330 0.0290 0.0311
23:01-24:00, Fri., 16 Feb. 0.0332 0.0297 0.0314
22:01-23:00, Fri., 16 Feb. 0.0330 0.0289 0.0311
21:01-22:00, Fri., 16 Feb. 0.0331 0.0292 0.0313
20:01-21:00, Fri., 16 Feb. 0.0334 0.0293 0.0313
19:01-20:00, Fri., 16 Feb. 0.0341 0.0291 0.0311
18:01-19:00, Fri., 16 Feb. 0.0335 0.0288 0.0312
17:01-18:00, Fri., 16 Feb. 0.0332 0.0294 0.0315
16:01-17:00, Fri., 16 Feb. 0.0331 0.0282 0.0311
15:01-16:00, Fri., 16 Feb. 0.0332 0.0293 0.0315
14:01-15:00, Fri., 16 Feb. 0.0338 0.0294 0.0315
13:01-14:00, Fri., 16 Feb. 0.0327 0.0294 0.0313
12:01-13:00, Fri., 16 Feb. 0.0337 0.0295 0.0317
11:01-12:00, Fri., 16 Feb. 0.0336 0.0286 0.0315
10:01-11:00, Fri., 16 Feb. 0.0331 0.0289 0.0314
09:01-10:00, Fri., 16 Feb. 0.0342 0.0294 0.0319
08:01-09:00, Fri., 16 Feb. 0.0347 0.0308 0.0326
07:01-08:00, Fri., 16 Feb. 0.0347 0.0310 0.0327
06:01-07:00, Fri., 16 Feb. 0.0342 0.0312 0.0329
05:01-06:00, Fri., 16 Feb. 0.0355 0.0307 0.0330
04:01-05:00, Fri., 16 Feb. 0.0348 0.0307 0.0329
03:01-04:00, Fri., 16 Feb. 0.0341 0.0298 0.0324
02:01-03:00, Fri., 16 Feb. 0.0350 0.0287 0.0322
01:01-02:00, Fri., 16 Feb. 0.0338 0.0298 0.0315
00:01-01:00, Fri., 16 Feb. 0.0333 0.0296 0.0315
23:01-24:00, Thu., 15 Feb. 0.0342 0.0298 0.0314
22:01-23:00, Thu., 15 Feb. 0.0335 0.0290 0.0314
21:01-22:00, Thu., 15 Feb. 0.0355 0.0286 0.0318
20:01-21:00, Thu., 15 Feb. 0.0336 0.0287 0.0315
19:01-20:00, Thu., 15 Feb. 0.0340 0.0289 0.0316
18:01-19:00, Thu., 15 Feb. 0.0333 0.0298 0.0316
17:01-18:00, Thu., 15 Feb. 0.0335 0.0294 0.0316
16:01-17:00, Thu., 15 Feb. 0.0336 0.0299 0.0318
15:01-16:00, Thu., 15 Feb. 0.0345 0.0299 0.0319
14:01-15:00, Thu., 15 Feb. 0.0338 0.0293 0.0317
13:01-14:00, Thu., 15 Feb. 0.0333 0.0298 0.0316
12:01-13:00, Thu., 15 Feb. 0.0339 0.0296 0.0316
11:01-12:00, Thu., 15 Feb. 0.0334 0.0294 0.0317
10:01-11:00, Thu., 15 Feb. 0.0338 0.0300 0.0318
09:01-10:00, Thu., 15 Feb. 0.0345 0.0296 0.0319
08:01-09:00, Thu., 15 Feb. 0.0340 0.0302 0.0319
07:01-08:00, Thu., 15 Feb. 0.0347 0.0302 0.0321
06:01-07:00, Thu., 15 Feb. 0.0340 0.0298 0.0321
05:01-06:00, Thu., 15 Feb. 0.0341 0.0299 0.0317
04:01-05:00, Thu., 15 Feb. 0.0334 0.0295 0.0316
03:01-04:00, Thu., 15 Feb. 0.0336 0.0290 0.0312
02:01-03:00, Thu., 15 Feb. 0.0342 0.0289 0.0318
01:01-02:00, Thu., 15 Feb. 0.0332 0.0289 0.0313
00:01-01:00, Thu., 15 Feb. 0.0334 0.0296 0.0317
23:01-24:00, Wed., 14 Feb. 0.0335 0.0292 0.0314
22:01-23:00, Wed., 14 Feb. 0.0335 0.0296 0.0313
21:01-22:00, Wed., 14 Feb. 0.0341 0.0285 0.0311
20:01-21:00, Wed., 14 Feb. 0.0330 0.0284 0.0311
19:01-20:00, Wed., 14 Feb. 0.0335 0.0291 0.0311
18:01-19:00, Wed., 14 Feb. 0.0326 0.0284 0.0308
17:01-18:00, Wed., 14 Feb. 0.0333 0.0288 0.0310
16:01-17:00, Wed., 14 Feb. 0.0331 0.0288 0.0312
15:01-16:00, Wed., 14 Feb. 0.0336 0.0296 0.0316
14:01-15:00, Wed., 14 Feb. 0.0330 0.0284 0.0310
13:01-14:00, Wed., 14 Feb. 0.0332 0.0293 0.0314
12:01-13:00, Wed., 14 Feb. 0.0334 0.0298 0.0315
11:01-12:00, Wed., 14 Feb. 0.0344 0.0297 0.0315
10:01-11:00, Wed., 14 Feb. 0.0331 0.0298 0.0315
09:01-10:00, Wed., 14 Feb. 0.0337 0.0292 0.0314
08:01-09:00, Wed., 14 Feb. 0.0338 0.0299 0.0320
07:01-08:00, Wed., 14 Feb. 0.0343 0.0299 0.0321
06:01-07:00, Wed., 14 Feb. 0.0341 0.0301 0.0321
05:01-06:00, Wed., 14 Feb. 0.0337 0.0297 0.0316
04:01-05:00, Wed., 14 Feb. 0.0343 0.0294 0.0316
03:01-04:00, Wed., 14 Feb. 0.0335 0.0290 0.0316
02:01-03:00, Wed., 14 Feb. 0.0338 0.0299 0.0317
01:01-02:00, Wed., 14 Feb. 0.0334 0.0292 0.0314
00:01-01:00, Wed., 14 Feb. 0.0349 0.0294 0.0317
23:01-24:00, Tue., 13 Feb. 0.0333 0.0293 0.0315
22:01-23:00, Tue., 13 Feb. 0.0344 0.0299 0.0316
21:01-22:00, Tue., 13 Feb. 0.0338 0.0295 0.0314
20:01-21:00, Tue., 13 Feb. 0.0334 0.0297 0.0314
19:01-20:00, Tue., 13 Feb. 0.0331 0.0295 0.0314
18:01-19:00, Tue., 13 Feb. 0.0341 0.0300 0.0316
17:01-18:00, Tue., 13 Feb. 0.0330 0.0284 0.0313
16:01-17:00, Tue., 13 Feb. 0.0336 0.0298 0.0314
15:01-16:00, Tue., 13 Feb. 0.0336 0.0294 0.0311
14:01-15:00, Tue., 13 Feb. 0.0334 0.0294 0.0313
13:01-14:00, Tue., 13 Feb. 0.0332 0.0296 0.0313
12:01-13:00, Tue., 13 Feb. 0.0345 0.0290 0.0312
11:01-12:00, Tue., 13 Feb. 0.0335 0.0292 0.0313
10:01-11:00, Tue., 13 Feb. 0.0336 0.0291 0.0314
09:01-10:00, Tue., 13 Feb. 0.0332 0.0285 0.0314
08:01-09:00, Tue., 13 Feb. 0.0339 0.0292 0.0315
07:01-08:00, Tue., 13 Feb. 0.0344 0.0296 0.0316
06:01-07:00, Tue., 13 Feb. 0.0343 0.0296 0.0319
05:01-06:00, Tue., 13 Feb. 0.0341 0.0296 0.0318
04:01-05:00, Tue., 13 Feb. 0.0335 0.0300 0.0317
03:01-04:00, Tue., 13 Feb. 0.0335 0.0301 0.0315
02:01-03:00, Tue., 13 Feb. 0.0336 0.0294 0.0314
01:01-02:00, Tue., 13 Feb. 0.0337 0.0288 0.0312
00:01-01:00, Tue., 13 Feb. 0.0333 0.0293 0.0312
23:01-24:00, Mon., 12 Feb. 0.0337 0.0302 0.0316
22:01-23:00, Mon., 12 Feb. 0.0340 0.0287 0.0314
21:01-22:00, Mon., 12 Feb. 0.0326 0.0290 0.0311
20:01-21:00, Mon., 12 Feb. 0.0332 0.0294 0.0313
19:01-20:00, Mon., 12 Feb. 0.0332 0.0291 0.0313
18:01-19:00, Mon., 12 Feb. 0.0339 0.0294 0.0313
17:01-18:00, Mon., 12 Feb. 0.0333 0.0286 0.0312
16:01-17:00, Mon., 12 Feb. 0.0335 0.0289 0.0314
15:01-16:00, Mon., 12 Feb. 0.0329 0.0297 0.0312
14:01-15:00, Mon., 12 Feb. 0.0329 0.0291 0.0312
13:01-14:00, Mon., 12 Feb. 0.0334 0.0298 0.0315
12:01-13:00, Mon., 12 Feb. 0.0338 0.0294 0.0315
11:01-12:00, Mon., 12 Feb. 0.0330 0.0300 0.0313
10:01-11:00, Mon., 12 Feb. 0.0335 0.0296 0.0316
09:01-10:00, Mon., 12 Feb. 0.0335 0.0290 0.0312
08:01-09:00, Mon., 12 Feb. 0.0330 0.0286 0.0312
07:01-08:00, Mon., 12 Feb. 0.0341 0.0294 0.0314
06:01-07:00, Mon., 12 Feb. 0.0335 0.0288 0.0312
05:01-06:00, Mon., 12 Feb. 0.0340 0.0287 0.0313
04:01-05:00, Mon., 12 Feb. 0.0330 0.0286 0.0312
03:01-04:00, Mon., 12 Feb. 0.0336 0.0298 0.0315
02:01-03:00, Mon., 12 Feb. 0.0334 0.0300 0.0314
01:01-02:00, Mon., 12 Feb. 0.0336 0.0295 0.0312
00:01-01:00, Mon., 12 Feb. 0.0333 0.0296 0.0313
23:01-24:00, Sun., 11 Feb. 0.0331 0.0297 0.0312
22:01-23:00, Sun., 11 Feb. 0.0332 0.0286 0.0310
21:01-22:00, Sun., 11 Feb. 0.0335 0.0295 0.0312
20:01-21:00, Sun., 11 Feb. 0.0331 0.0300 0.0315
19:01-20:00, Sun., 11 Feb. 0.0330 0.0299 0.0314
18:01-19:00, Sun., 11 Feb. 0.0331 0.0290 0.0312
17:01-18:00, Sun., 11 Feb. 0.0332 0.0283 0.0313
16:01-17:00, Sun., 11 Feb. 0.0331 0.0300 0.0316
15:01-16:00, Sun., 11 Feb. 0.0339 0.0296 0.0317
14:01-15:00, Sun., 11 Feb. 0.0330 0.0295 0.0314
13:01-14:00, Sun., 11 Feb. 0.0340 0.0291 0.0316
12:01-13:00, Sun., 11 Feb. 0.0336 0.0301 0.0318
11:01-12:00, Sun., 11 Feb. 0.0337 0.0302 0.0317
10:01-11:00, Sun., 11 Feb. 0.0340 0.0307 0.0322
09:01-10:00, Sun., 11 Feb. 0.0343 0.0304 0.0324
08:01-09:00, Sun., 11 Feb. 0.0342 0.0297 0.0323
07:01-08:00, Sun., 11 Feb. 0.0341 0.0301 0.0323
06:01-07:00, Sun., 11 Feb. 0.0345 0.0306 0.0324
05:01-06:00, Sun., 11 Feb. 0.0348 0.0310 0.0326
04:01-05:00, Sun., 11 Feb. 0.0342 0.0309 0.0324
03:01-04:00, Sun., 11 Feb. 0.0346 0.0304 0.0326
02:01-03:00, Sun., 11 Feb. 0.0349 0.0306 0.0324
01:01-02:00, Sun., 11 Feb. 0.0340 0.0307 0.0324
00:01-01:00, Sun., 11 Feb. 0.0339 0.0299 0.0320
23:01-24:00, Sat., 10 Feb. 0.0338 0.0290 0.0313
22:01-23:00, Sat., 10 Feb. 0.0344 0.0303 0.0323
21:01-22:00, Sat., 10 Feb. 0.0350 0.0279 0.0319
20:01-21:00, Sat., 10 Feb. 0.0334 0.0285 0.0311
19:01-20:00, Sat., 10 Feb. 0.0329 0.0280 0.0307
18:01-19:00, Sat., 10 Feb. 0.0325 0.0281 0.0306
17:01-18:00, Sat., 10 Feb. 0.0323 0.0291 0.0306
16:01-17:00, Sat., 10 Feb. 0.0335 0.0289 0.0307
15:01-16:00, Sat., 10 Feb. 0.0334 0.0279 0.0305
14:01-15:00, Sat., 10 Feb. 0.0325 0.0283 0.0306
13:01-14:00, Sat., 10 Feb. 0.0331 0.0291 0.0308
12:01-13:00, Sat., 10 Feb. 0.0333 0.0289 0.0314
11:01-12:00, Sat., 10 Feb. 0.0335 0.0301 0.0318
10:01-11:00, Sat., 10 Feb. 0.0345 0.0301 0.0325
09:01-10:00, Sat., 10 Feb. 0.0353 0.0302 0.0324