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, 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






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 7:30 to 18:00 on Sunday, December 10,2017
From 7:00 to 19:00 on Sunday, February 18,2018

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. 0.0354 0.0311 0.0331
10:01-11:00, Mon., 11 Dec. 0.0354 0.0306 0.0331
09:01-10:00, Mon., 11 Dec. 0.0358 0.0316 0.0338
08:01-09:00, Mon., 11 Dec. 0.0357 0.0318 0.0338
07:01-08:00, Mon., 11 Dec. 0.0356 0.0320 0.0338
06:01-07:00, Mon., 11 Dec. 0.0364 0.0323 0.0340
05:01-06:00, Mon., 11 Dec. 0.0358 0.0323 0.0340
04:01-05:00, Mon., 11 Dec. 0.0346 0.0309 0.0325
03:01-04:00, Mon., 11 Dec. 0.0337 0.0294 0.0319
02:01-03:00, Mon., 11 Dec. 0.0352 0.0306 0.0328
01:01-02:00, Mon., 11 Dec. 0.0351 0.0312 0.0329
00:01-01:00, Mon., 11 Dec. 0.0350 0.0302 0.0328
23:01-24:00, Sun., 10 Dec. 0.0354 0.0309 0.0329
22:01-23:00, Sun., 10 Dec. 0.0351 0.0306 0.0329
21:01-22:00, Sun., 10 Dec. 0.0359 0.0306 0.0332
20:01-21:00, Sun., 10 Dec. 0.0348 0.0311 0.0332
19:01-20:00, Sun., 10 Dec. 0.0352 0.0310 0.0328
18:01-19:00, Sun., 10 Dec. 0.0349 0.0307 0.0326
17:01-18:00, Sun., 10 Dec. 0.0340 0.0302 0.0323
16:01-17:00, Sun., 10 Dec. 0.0342 0.0307 0.0320
15:01-16:00, Sun., 10 Dec. 0.0344 0.0301 0.0320
14:01-15:00, Sun., 10 Dec. 0.0359 0.0316 0.0329
11:01-12:00, Sun., 10 Dec. 0.0349 0.0314 0.0331
10:01-11:00, Sun., 10 Dec. 0.0359 0.0303 0.0333
09:01-10:00, Sun., 10 Dec. 0.0361 0.0327 0.0342
08:01-09:00, Sun., 10 Dec. 0.0368 0.0326 0.0347
07:01-08:00, Sun., 10 Dec. 0.0362 0.0319 0.0340
06:01-07:00, Sun., 10 Dec. 0.0351 0.0306 0.0327
05:01-06:00, Sun., 10 Dec. 0.0355 0.0316 0.0332
04:01-05:00, Sun., 10 Dec. 0.0362 0.0309 0.0330
03:01-04:00, Sun., 10 Dec. 0.0359 0.0309 0.0332
02:01-03:00, Sun., 10 Dec. 0.0362 0.0310 0.0335
01:01-02:00, Sun., 10 Dec. 0.0352 0.0319 0.0335
00:01-01:00, Sun., 10 Dec. 0.0357 0.0315 0.0335
23:01-24:00, Sat., 09 Dec. 0.0353 0.0308 0.0332
22:01-23:00, Sat., 09 Dec. 0.0349 0.0298 0.0325
21:01-22:00, Sat., 09 Dec. 0.0344 0.0299 0.0323
20:01-21:00, Sat., 09 Dec. 0.0351 0.0305 0.0325
19:01-20:00, Sat., 09 Dec. 0.0354 0.0301 0.0324
18:01-19:00, Sat., 09 Dec. 0.0342 0.0300 0.0319
17:01-18:00, Sat., 09 Dec. 0.0335 0.0296 0.0317
16:01-17:00, Sat., 09 Dec. 0.0340 0.0294 0.0320
15:01-16:00, Sat., 09 Dec. 0.0346 0.0302 0.0320
14:01-15:00, Sat., 09 Dec. 0.0339 0.0293 0.0322
13:01-14:00, Sat., 09 Dec. 0.0350 0.0301 0.0320
12:01-13:00, Sat., 09 Dec. 0.0343 0.0298 0.0320
11:01-12:00, Sat., 09 Dec. 0.0343 0.0298 0.0322
10:01-11:00, Sat., 09 Dec. 0.0334 0.0300 0.0322
09:01-10:00, Sat., 09 Dec. 0.0345 0.0304 0.0326
08:01-09:00, Sat., 09 Dec. 0.0343 0.0298 0.0323
07:01-08:00, Sat., 09 Dec. 0.0345 0.0303 0.0322
06:01-07:00, Sat., 09 Dec. 0.0360 0.0307 0.0326
05:01-06:00, Sat., 09 Dec. 0.0344 0.0309 0.0326
04:01-05:00, Sat., 09 Dec. 0.0351 0.0310 0.0329
03:01-04:00, Sat., 09 Dec. 0.0349 0.0310 0.0330
02:01-03:00, Sat., 09 Dec. 0.0350 0.0309 0.0327
01:01-02:00, Sat., 09 Dec. 0.0350 0.0306 0.0323
00:01-01:00, Sat., 09 Dec. 0.0347 0.0299 0.0323
23:01-24:00, Fri., 08 Dec. 0.0345 0.0306 0.0327
22:01-23:00, Fri., 08 Dec. 0.0364 0.0316 0.0337
21:01-22:00, Fri., 08 Dec. 0.0429 0.0339 0.0369
20:01-21:00, Fri., 08 Dec. 0.0545 0.0383 0.0463
19:01-20:00, Fri., 08 Dec. 0.0559 0.0421 0.0481
18:01-19:00, Fri., 08 Dec. 0.0471 0.0336 0.0420
17:01-18:00, Fri., 08 Dec. 0.0400 0.0322 0.0351
16:01-17:00, Fri., 08 Dec. 0.0385 0.0331 0.0358
15:01-16:00, Fri., 08 Dec. 0.0360 0.0311 0.0331
14:01-15:00, Fri., 08 Dec. 0.0346 0.0305 0.0328
13:01-14:00, Fri., 08 Dec. 0.0346 0.0302 0.0329
12:01-13:00, Fri., 08 Dec. 0.0350 0.0303 0.0333
11:01-12:00, Fri., 08 Dec. 0.0354 0.0316 0.0334
10:01-11:00, Fri., 08 Dec. 0.0366 0.0313 0.0340
09:01-10:00, Fri., 08 Dec. 0.0361 0.0314 0.0335
08:01-09:00, Fri., 08 Dec. 0.0356 0.0307 0.0333
07:01-08:00, Fri., 08 Dec. 0.0355 0.0318 0.0336
06:01-07:00, Fri., 08 Dec. 0.0353 0.0320 0.0336
05:01-06:00, Fri., 08 Dec. 0.0345 0.0311 0.0329
04:01-05:00, Fri., 08 Dec. 0.0352 0.0311 0.0329
03:01-04:00, Fri., 08 Dec. 0.0349 0.0310 0.0331
02:01-03:00, Fri., 08 Dec. 0.0355 0.0312 0.0330
01:01-02:00, Fri., 08 Dec. 0.0356 0.0315 0.0333
00:01-01:00, Fri., 08 Dec. 0.0366 0.0313 0.0334
23:01-24:00, Thu., 07 Dec. 0.0371 0.0313 0.0335
22:01-23:00, Thu., 07 Dec. 0.0352 0.0312 0.0335
21:01-22:00, Thu., 07 Dec. 0.0359 0.0309 0.0330
20:01-21:00, Thu., 07 Dec. 0.0353 0.0310 0.0330
19:01-20:00, Thu., 07 Dec. 0.0349 0.0311 0.0327
18:01-19:00, Thu., 07 Dec. 0.0352 0.0305 0.0323
17:01-18:00, Thu., 07 Dec. 0.0335 0.0298 0.0321
16:01-17:00, Thu., 07 Dec. 0.0345 0.0306 0.0322
15:01-16:00, Thu., 07 Dec. 0.0347 0.0290 0.0321
14:01-15:00, Thu., 07 Dec. 0.0344 0.0293 0.0326
13:01-14:00, Thu., 07 Dec. 0.0350 0.0306 0.0326
12:01-13:00, Thu., 07 Dec. 0.0343 0.0307 0.0326
11:01-12:00, Thu., 07 Dec. 0.0347 0.0304 0.0328
10:01-11:00, Thu., 07 Dec. 0.0364 0.0308 0.0328
09:01-10:00, Thu., 07 Dec. 0.0357 0.0314 0.0332
08:01-09:00, Thu., 07 Dec. 0.0355 0.0317 0.0335
07:01-08:00, Thu., 07 Dec. 0.0371 0.0311 0.0336
06:01-07:00, Thu., 07 Dec. 0.0357 0.0318 0.0335
05:01-06:00, Thu., 07 Dec. 0.0360 0.0310 0.0335
04:01-05:00, Thu., 07 Dec. 0.0360 0.0317 0.0333
03:01-04:00, Thu., 07 Dec. 0.0358 0.0307 0.0331
02:01-03:00, Thu., 07 Dec. 0.0368 0.0312 0.0333
01:01-02:00, Thu., 07 Dec. 0.0351 0.0300 0.0331
00:01-01:00, Thu., 07 Dec. 0.0347 0.0308 0.0329
23:01-24:00, Wed., 06 Dec. 0.0352 0.0316 0.0332
22:01-23:00, Wed., 06 Dec. 0.0355 0.0316 0.0336
21:01-22:00, Wed., 06 Dec. 0.0346 0.0309 0.0329
20:01-21:00, Wed., 06 Dec. 0.0344 0.0302 0.0324
19:01-20:00, Wed., 06 Dec. 0.0342 0.0304 0.0322
18:01-19:00, Wed., 06 Dec. 0.0351 0.0305 0.0322
17:01-18:00, Wed., 06 Dec. 0.0350 0.0298 0.0323
16:01-17:00, Wed., 06 Dec. 0.0338 0.0296 0.0322
15:01-16:00, Wed., 06 Dec. 0.0341 0.0301 0.0324
14:01-15:00, Wed., 06 Dec. 0.0353 0.0305 0.0325
13:01-14:00, Wed., 06 Dec. 0.0343 0.0303 0.0327
12:01-13:00, Wed., 06 Dec. 0.0346 0.0296 0.0325
11:01-12:00, Wed., 06 Dec. 0.0345 0.0307 0.0325
10:01-11:00, Wed., 06 Dec. 0.0346 0.0306 0.0325
09:01-10:00, Wed., 06 Dec. 0.0350 0.0306 0.0327
08:01-09:00, Wed., 06 Dec. 0.0353 0.0309 0.0329
07:01-08:00, Wed., 06 Dec. 0.0347 0.0309 0.0326
06:01-07:00, Wed., 06 Dec. 0.0343 0.0308 0.0323
05:01-06:00, Wed., 06 Dec. 0.0353 0.0300 0.0325
04:01-05:00, Wed., 06 Dec. 0.0343 0.0302 0.0320
03:01-04:00, Wed., 06 Dec. 0.0340 0.0287 0.0320
02:01-03:00, Wed., 06 Dec. 0.0343 0.0296 0.0318
01:01-02:00, Wed., 06 Dec. 0.0342 0.0298 0.0317
00:01-01:00, Wed., 06 Dec. 0.0341 0.0293 0.0316
23:01-24:00, Tue., 05 Dec. 0.0347 0.0294 0.0316
22:01-23:00, Tue., 05 Dec. 0.0333 0.0291 0.0313
21:01-22:00, Tue., 05 Dec. 0.0338 0.0296 0.0317
20:01-21:00, Tue., 05 Dec. 0.0336 0.0298 0.0317
19:01-20:00, Tue., 05 Dec. 0.0333 0.0298 0.0315
18:01-19:00, Tue., 05 Dec. 0.0337 0.0294 0.0317
17:01-18:00, Tue., 05 Dec. 0.0333 0.0295 0.0315
16:01-17:00, Tue., 05 Dec. 0.0338 0.0301 0.0320
15:01-16:00, Tue., 05 Dec. 0.0339 0.0302 0.0317
14:01-15:00, Tue., 05 Dec. 0.0339 0.0299 0.0319
13:01-14:00, Tue., 05 Dec. 0.0341 0.0300 0.0320
12:01-13:00, Tue., 05 Dec. 0.0352 0.0292 0.0320
11:01-12:00, Tue., 05 Dec. 0.0344 0.0298 0.0322
10:01-11:00, Tue., 05 Dec. 0.0339 0.0305 0.0323
09:01-10:00, Tue., 05 Dec. 0.0347 0.0297 0.0325
08:01-09:00, Tue., 05 Dec. 0.0353 0.0312 0.0331
07:01-08:00, Tue., 05 Dec. 0.0350 0.0310 0.0327
06:01-07:00, Tue., 05 Dec. 0.0348 0.0313 0.0329
05:01-06:00, Tue., 05 Dec. 0.0344 0.0304 0.0328
04:01-05:00, Tue., 05 Dec. 0.0355 0.0311 0.0329
03:01-04:00, Tue., 05 Dec. 0.0353 0.0308 0.0327
02:01-03:00, Tue., 05 Dec. 0.0352 0.0307 0.0328
01:01-02:00, Tue., 05 Dec. 0.0346 0.0300 0.0323
00:01-01:00, Tue., 05 Dec. 0.0339 0.0306 0.0320
23:01-24:00, Mon., 04 Dec. 0.0341 0.0296 0.0319
22:01-23:00, Mon., 04 Dec. 0.0345 0.0299 0.0321
21:01-22:00, Mon., 04 Dec. 0.0348 0.0303 0.0330
20:01-21:00, Mon., 04 Dec. 0.0387 0.0333 0.0355
19:01-20:00, Mon., 04 Dec. 0.0386 0.0343 0.0363
18:01-19:00, Mon., 04 Dec. 0.0402 0.0325 0.0359
17:01-18:00, Mon., 04 Dec. 0.0373 0.0326 0.0350
16:01-17:00, Mon., 04 Dec. 0.0353 0.0309 0.0331
15:01-16:00, Mon., 04 Dec. 0.0343 0.0291 0.0323
14:01-15:00, Mon., 04 Dec. 0.0351 0.0311 0.0328
13:01-14:00, Mon., 04 Dec. 0.0342 0.0299 0.0327
12:01-13:00, Mon., 04 Dec. 0.0360 0.0308 0.0327
11:01-12:00, Mon., 04 Dec. 0.0347 0.0301 0.0327
10:01-11:00, Mon., 04 Dec. 0.0365 0.0316 0.0334
09:01-10:00, Mon., 04 Dec. 0.0356 0.0308 0.0338
08:01-09:00, Mon., 04 Dec. 0.0359 0.0303 0.0328
07:01-08:00, Mon., 04 Dec. 0.0347 0.0309 0.0326
06:01-07:00, Mon., 04 Dec. 0.0346 0.0295 0.0326
05:01-06:00, Mon., 04 Dec. 0.0352 0.0308 0.0328
04:01-05:00, Mon., 04 Dec. 0.0353 0.0313 0.0331
03:01-04:00, Mon., 04 Dec. 0.0354 0.0309 0.0330
02:01-03:00, Mon., 04 Dec. 0.0352 0.0307 0.0330
01:01-02:00, Mon., 04 Dec. 0.0354 0.0315 0.0335
00:01-01:00, Mon., 04 Dec. 0.0360 0.0313 0.0334
23:01-24:00, Sun., 03 Dec. 0.0358 0.0316 0.0334
22:01-23:00, Sun., 03 Dec. 0.0352 0.0313 0.0333
21:01-22:00, Sun., 03 Dec. 0.0358 0.0301 0.0332
20:01-21:00, Sun., 03 Dec. 0.0350 0.0300 0.0333
19:01-20:00, Sun., 03 Dec. 0.0344 0.0304 0.0325
18:01-19:00, Sun., 03 Dec. 0.0350 0.0304 0.0326
17:01-18:00, Sun., 03 Dec. 0.0354 0.0299 0.0323
16:01-17:00, Sun., 03 Dec. 0.0344 0.0305 0.0323
15:01-16:00, Sun., 03 Dec. 0.0341 0.0303 0.0322
14:01-15:00, Sun., 03 Dec. 0.0345 0.0300 0.0323
13:01-14:00, Sun., 03 Dec. 0.0351 0.0306 0.0327
12:01-13:00, Sun., 03 Dec. 0.0343 0.0305 0.0326
11:01-12:00, Sun., 03 Dec. 0.0343 0.0300 0.0325
10:01-11:00, Sun., 03 Dec. 0.0348 0.0310 0.0327
09:01-10:00, Sun., 03 Dec. 0.0352 0.0315 0.0330
08:01-09:00, Sun., 03 Dec. 0.0366 0.0318 0.0341
07:01-08:00, Sun., 03 Dec. 0.0363 0.0322 0.0341
06:01-07:00, Sun., 03 Dec. 0.0364 0.0326 0.0343
05:01-06:00, Sun., 03 Dec. 0.0361 0.0317 0.0336
04:01-05:00, Sun., 03 Dec. 0.0352 0.0316 0.0334
03:01-04:00, Sun., 03 Dec. 0.0352 0.0306 0.0333
02:01-03:00, Sun., 03 Dec. 0.0364 0.0314 0.0333
01:01-02:00, Sun., 03 Dec. 0.0352 0.0312 0.0330
00:01-01:00, Sun., 03 Dec. 0.0361 0.0305 0.0333
23:01-24:00, Sat., 02 Dec. 0.0352 0.0315 0.0331
22:01-23:00, Sat., 02 Dec. 0.0352 0.0309 0.0327
21:01-22:00, Sat., 02 Dec. 0.0349 0.0296 0.0322
20:01-21:00, Sat., 02 Dec. 0.0340 0.0304 0.0321
19:01-20:00, Sat., 02 Dec. 0.0332 0.0299 0.0315
18:01-19:00, Sat., 02 Dec. 0.0342 0.0300 0.0315
17:01-18:00, Sat., 02 Dec. 0.0332 0.0292 0.0315
16:01-17:00, Sat., 02 Dec. 0.0337 0.0293 0.0315
15:01-16:00, Sat., 02 Dec. 0.0339 0.0292 0.0317
14:01-15:00, Sat., 02 Dec. 0.0343 0.0297 0.0316
13:01-14:00, Sat., 02 Dec. 0.0336 0.0292 0.0318
12:01-13:00, Sat., 02 Dec. 0.0337 0.0299 0.0316
11:01-12:00, Sat., 02 Dec. 0.0328 0.0293 0.0316
10:01-11:00, Sat., 02 Dec. 0.0351 0.0292 0.0317
09:01-10:00, Sat., 02 Dec. 0.0338 0.0299 0.0317
08:01-09:00, Sat., 02 Dec. 0.0337 0.0298 0.0317
07:01-08:00, Sat., 02 Dec. 0.0340 0.0303 0.0321
06:01-07:00, Sat., 02 Dec. 0.0340 0.0303 0.0323
05:01-06:00, Sat., 02 Dec. 0.0341 0.0291 0.0321
04:01-05:00, Sat., 02 Dec. 0.0346 0.0307 0.0324
03:01-04:00, Sat., 02 Dec. 0.0341 0.0303 0.0322
02:01-03:00, Sat., 02 Dec. 0.0348 0.0307 0.0326
01:01-02:00, Sat., 02 Dec. 0.0351 0.0300 0.0325
00:01-01:00, Sat., 02 Dec. 0.0336 0.0294 0.0320
23:01-24:00, Fri., 01 Dec. 0.0340 0.0301 0.0323
22:01-23:00, Fri., 01 Dec. 0.0338 0.0308 0.0321
21:01-22:00, Fri., 01 Dec. 0.0341 0.0286 0.0320
20:01-21:00, Fri., 01 Dec. 0.0338 0.0299 0.0320
19:01-20:00, Fri., 01 Dec. 0.0345 0.0300 0.0319
18:01-19:00, Fri., 01 Dec. 0.0351 0.0300 0.0318
17:01-18:00, Fri., 01 Dec. 0.0343 0.0298 0.0317
16:01-17:00, Fri., 01 Dec. 0.0347 0.0301 0.0318
15:01-16:00, Fri., 01 Dec. 0.0338 0.0304 0.0321
14:01-15:00, Fri., 01 Dec. 0.0343 0.0294 0.0319
13:01-14:00, Fri., 01 Dec. 0.0343 0.0301 0.0320
12:01-13:00, Fri., 01 Dec. 0.0336 0.0299 0.0317
11:01-12:00, Fri., 01 Dec. 0.0337 0.0310 0.0323
10:01-11:00, Fri., 01 Dec. 0.0346 0.0301 0.0326