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

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