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

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.

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, Sun., 22 Dec. 0.0356 0.0304 0.0332
10:01-11:00, Sun., 22 Dec. 0.0353 0.0313 0.0332
09:01-10:00, Sun., 22 Dec. 0.0344 0.0307 0.0327
08:01-09:00, Sun., 22 Dec. 0.0354 0.0301 0.0328
07:01-08:00, Sun., 22 Dec. 0.0357 0.0305 0.0329
06:01-07:00, Sun., 22 Dec. 0.0362 0.0312 0.0331
05:01-06:00, Sun., 22 Dec. 0.0350 0.0304 0.0331
04:01-05:00, Sun., 22 Dec. 0.0361 0.0305 0.0333
03:01-04:00, Sun., 22 Dec. 0.0350 0.0315 0.0333
02:01-03:00, Sun., 22 Dec. 0.0351 0.0316 0.0333
01:01-02:00, Sun., 22 Dec. 0.0350 0.0308 0.0329
00:01-01:00, Sun., 22 Dec. 0.0352 0.0309 0.0329
23:01-24:00, Sat., 21 Dec. 0.0353 0.0307 0.0328
22:01-23:00, Sat., 21 Dec. 0.0354 0.0300 0.0326
21:01-22:00, Sat., 21 Dec. 0.0358 0.0297 0.0325
20:01-21:00, Sat., 21 Dec. 0.0356 0.0305 0.0324
19:01-20:00, Sat., 21 Dec. 0.0348 0.0304 0.0325
18:01-19:00, Sat., 21 Dec. 0.0342 0.0294 0.0322
17:01-18:00, Sat., 21 Dec. 0.0354 0.0294 0.0324
16:01-17:00, Sat., 21 Dec. 0.0349 0.0297 0.0328
15:01-16:00, Sat., 21 Dec. 0.0341 0.0304 0.0324
14:01-15:00, Sat., 21 Dec. 0.0350 0.0308 0.0326
13:01-14:00, Sat., 21 Dec. 0.0350 0.0297 0.0325
12:01-13:00, Sat., 21 Dec. 0.0345 0.0302 0.0324
11:01-12:00, Sat., 21 Dec. 0.0349 0.0304 0.0325
10:01-11:00, Sat., 21 Dec. 0.0357 0.0315 0.0332
09:01-10:00, Sat., 21 Dec. 0.0352 0.0310 0.0333
08:01-09:00, Sat., 21 Dec. 0.0354 0.0311 0.0332
07:01-08:00, Sat., 21 Dec. 0.0360 0.0303 0.0330
06:01-07:00, Sat., 21 Dec. 0.0354 0.0313 0.0330
05:01-06:00, Sat., 21 Dec. 0.0342 0.0304 0.0322
04:01-05:00, Sat., 21 Dec. 0.0350 0.0305 0.0324
03:01-04:00, Sat., 21 Dec. 0.0346 0.0299 0.0323
02:01-03:00, Sat., 21 Dec. 0.0359 0.0308 0.0326
01:01-02:00, Sat., 21 Dec. 0.0351 0.0304 0.0327
00:01-01:00, Sat., 21 Dec. 0.0345 0.0303 0.0324
23:01-24:00, Fri., 20 Dec. 0.0345 0.0301 0.0324
22:01-23:00, Fri., 20 Dec. 0.0347 0.0296 0.0324
21:01-22:00, Fri., 20 Dec. 0.0348 0.0308 0.0325
20:01-21:00, Fri., 20 Dec. 0.0345 0.0298 0.0322
19:01-20:00, Fri., 20 Dec. 0.0343 0.0304 0.0324
18:01-19:00, Fri., 20 Dec. 0.0346 0.0294 0.0324
17:01-18:00, Fri., 20 Dec. 0.0346 0.0292 0.0320
16:01-17:00, Fri., 20 Dec. 0.0358 0.0300 0.0321
15:01-16:00, Fri., 20 Dec. 0.0352 0.0303 0.0323
14:01-15:00, Fri., 20 Dec. 0.0341 0.0302 0.0321
13:01-14:00, Fri., 20 Dec. 0.0351 0.0301 0.0321
12:01-13:00, Fri., 20 Dec. 0.0362 0.0305 0.0323
11:01-12:00, Fri., 20 Dec. 0.0343 0.0300 0.0325
10:01-11:00, Fri., 20 Dec. 0.0353 0.0301 0.0322
09:01-10:00, Fri., 20 Dec. 0.0344 0.0291 0.0323
08:01-09:00, Fri., 20 Dec. 0.0343 0.0301 0.0324
07:01-08:00, Fri., 20 Dec. 0.0347 0.0300 0.0324
06:01-07:00, Fri., 20 Dec. 0.0344 0.0303 0.0325
05:01-06:00, Fri., 20 Dec. 0.0349 0.0291 0.0324
04:01-05:00, Fri., 20 Dec. 0.0356 0.0308 0.0327
03:01-04:00, Fri., 20 Dec. 0.0351 0.0302 0.0323
02:01-03:00, Fri., 20 Dec. 0.0343 0.0297 0.0320
01:01-02:00, Fri., 20 Dec. 0.0342 0.0295 0.0318
00:01-01:00, Fri., 20 Dec. 0.0340 0.0294 0.0315
23:01-24:00, Thu., 19 Dec. 0.0335 0.0293 0.0318
22:01-23:00, Thu., 19 Dec. 0.0347 0.0295 0.0314
21:01-22:00, Thu., 19 Dec. 0.0349 0.0296 0.0318
20:01-21:00, Thu., 19 Dec. 0.0343 0.0294 0.0320
19:01-20:00, Thu., 19 Dec. 0.0359 0.0297 0.0324
18:01-19:00, Thu., 19 Dec. 0.0344 0.0305 0.0325
17:01-18:00, Thu., 19 Dec. 0.0341 0.0298 0.0322
16:01-17:00, Thu., 19 Dec. 0.0349 0.0304 0.0326
15:01-16:00, Thu., 19 Dec. 0.0349 0.0304 0.0324
14:01-15:00, Thu., 19 Dec. 0.0337 0.0298 0.0322
13:01-14:00, Thu., 19 Dec. 0.0355 0.0301 0.0324
12:01-13:00, Thu., 19 Dec. 0.0360 0.0304 0.0336
11:01-12:00, Thu., 19 Dec. 0.0405 0.0329 0.0369
10:01-11:00, Thu., 19 Dec. 0.0430 0.0325 0.0387
09:01-10:00, Thu., 19 Dec. 0.0344 0.0297 0.0322
08:01-09:00, Thu., 19 Dec. 0.0350 0.0302 0.0326
07:01-08:00, Thu., 19 Dec. 0.0377 0.0318 0.0340
06:01-07:00, Thu., 19 Dec. 0.0381 0.0326 0.0356
05:01-06:00, Thu., 19 Dec. 0.0366 0.0322 0.0348
04:01-05:00, Thu., 19 Dec. 0.0420 0.0339 0.0367
03:01-04:00, Thu., 19 Dec. 0.0357 0.0311 0.0330
02:01-03:00, Thu., 19 Dec. 0.0356 0.0307 0.0331
01:01-02:00, Thu., 19 Dec. 0.0356 0.0307 0.0331
00:01-01:00, Thu., 19 Dec. 0.0361 0.0298 0.0326
23:01-24:00, Wed., 18 Dec. 0.0349 0.0300 0.0321
22:01-23:00, Wed., 18 Dec. 0.0358 0.0288 0.0328
21:01-22:00, Wed., 18 Dec. 0.0347 0.0305 0.0327
20:01-21:00, Wed., 18 Dec. 0.0349 0.0309 0.0325
19:01-20:00, Wed., 18 Dec. 0.0356 0.0307 0.0328
18:01-19:00, Wed., 18 Dec. 0.0353 0.0309 0.0329
17:01-18:00, Wed., 18 Dec. 0.0352 0.0308 0.0328
16:01-17:00, Wed., 18 Dec. 0.0348 0.0307 0.0329
15:01-16:00, Wed., 18 Dec. 0.0366 0.0305 0.0328
14:01-15:00, Wed., 18 Dec. 0.0353 0.0302 0.0326
13:01-14:00, Wed., 18 Dec. 0.0349 0.0301 0.0327
12:01-13:00, Wed., 18 Dec. 0.0352 0.0309 0.0330
11:01-12:00, Wed., 18 Dec. 0.0352 0.0303 0.0332
10:01-11:00, Wed., 18 Dec. 0.0356 0.0315 0.0338
09:01-10:00, Wed., 18 Dec. 0.0362 0.0308 0.0332
08:01-09:00, Wed., 18 Dec. 0.0367 0.0314 0.0337
07:01-08:00, Wed., 18 Dec. 0.0354 0.0314 0.0335
06:01-07:00, Wed., 18 Dec. 0.0359 0.0308 0.0331
05:01-06:00, Wed., 18 Dec. 0.0351 0.0308 0.0330
04:01-05:00, Wed., 18 Dec. 0.0362 0.0310 0.0335
03:01-04:00, Wed., 18 Dec. 0.0362 0.0315 0.0335
02:01-03:00, Wed., 18 Dec. 0.0363 0.0316 0.0338
01:01-02:00, Wed., 18 Dec. 0.0366 0.0315 0.0336
00:01-01:00, Wed., 18 Dec. 0.0359 0.0309 0.0332
23:01-24:00, Tue., 17 Dec. 0.0353 0.0312 0.0332
22:01-23:00, Tue., 17 Dec. 0.0349 0.0302 0.0328
21:01-22:00, Tue., 17 Dec. 0.0348 0.0303 0.0326
20:01-21:00, Tue., 17 Dec. 0.0348 0.0304 0.0327
19:01-20:00, Tue., 17 Dec. 0.0351 0.0297 0.0330
18:01-19:00, Tue., 17 Dec. 0.0353 0.0308 0.0330
17:01-18:00, Tue., 17 Dec. 0.0345 0.0302 0.0325
16:01-17:00, Tue., 17 Dec. 0.0349 0.0295 0.0325
15:01-16:00, Tue., 17 Dec. 0.0353 0.0304 0.0325
14:01-15:00, Tue., 17 Dec. 0.0363 0.0305 0.0330
13:01-14:00, Tue., 17 Dec. 0.0363 0.0306 0.0329
12:01-13:00, Tue., 17 Dec. 0.0351 0.0304 0.0330
11:01-12:00, Tue., 17 Dec. 0.0354 0.0308 0.0334
10:01-11:00, Tue., 17 Dec. 0.0357 0.0314 0.0339
09:01-10:00, Tue., 17 Dec. 0.0363 0.0313 0.0337
08:01-09:00, Tue., 17 Dec. 0.0368 0.0320 0.0338
07:01-08:00, Tue., 17 Dec. 0.0373 0.0312 0.0338
06:01-07:00, Tue., 17 Dec. 0.0358 0.0309 0.0334
05:01-06:00, Tue., 17 Dec. 0.0360 0.0304 0.0333
04:01-05:00, Tue., 17 Dec. 0.0351 0.0307 0.0330
03:01-04:00, Tue., 17 Dec. 0.0360 0.0311 0.0335
02:01-03:00, Tue., 17 Dec. 0.0368 0.0312 0.0335
01:01-02:00, Tue., 17 Dec. 0.0356 0.0318 0.0337
00:01-01:00, Tue., 17 Dec. 0.0363 0.0315 0.0335
23:01-24:00, Mon., 16 Dec. 0.0353 0.0303 0.0327
22:01-23:00, Mon., 16 Dec. 0.0362 0.0307 0.0330
21:01-22:00, Mon., 16 Dec. 0.0349 0.0306 0.0327
20:01-21:00, Mon., 16 Dec. 0.0353 0.0306 0.0329
19:01-20:00, Mon., 16 Dec. 0.0355 0.0304 0.0327
18:01-19:00, Mon., 16 Dec. 0.0352 0.0308 0.0329
17:01-18:00, Mon., 16 Dec. 0.0348 0.0306 0.0327
16:01-17:00, Mon., 16 Dec. 0.0353 0.0304 0.0326
15:01-16:00, Mon., 16 Dec. 0.0349 0.0306 0.0326
14:01-15:00, Mon., 16 Dec. 0.0370 0.0301 0.0327
13:01-14:00, Mon., 16 Dec. 0.0351 0.0304 0.0327
12:01-13:00, Mon., 16 Dec. 0.0348 0.0309 0.0328
11:01-12:00, Mon., 16 Dec. 0.0360 0.0303 0.0329
10:01-11:00, Mon., 16 Dec. 0.0351 0.0309 0.0329
09:01-10:00, Mon., 16 Dec. 0.0346 0.0304 0.0324
08:01-09:00, Mon., 16 Dec. 0.0355 0.0302 0.0327
07:01-08:00, Mon., 16 Dec. 0.0354 0.0304 0.0330
06:01-07:00, Mon., 16 Dec. 0.0356 0.0302 0.0329
05:01-06:00, Mon., 16 Dec. 0.0353 0.0302 0.0328
04:01-05:00, Mon., 16 Dec. 0.0360 0.0303 0.0328
03:01-04:00, Mon., 16 Dec. 0.0346 0.0304 0.0328
02:01-03:00, Mon., 16 Dec. 0.0353 0.0302 0.0325
01:01-02:00, Mon., 16 Dec. 0.0357 0.0305 0.0329
00:01-01:00, Mon., 16 Dec. 0.0360 0.0306 0.0329
23:01-24:00, Sun., 15 Dec. 0.0356 0.0308 0.0329
22:01-23:00, Sun., 15 Dec. 0.0349 0.0304 0.0326
21:01-22:00, Sun., 15 Dec. 0.0347 0.0299 0.0327
20:01-21:00, Sun., 15 Dec. 0.0352 0.0299 0.0326
19:01-20:00, Sun., 15 Dec. 0.0350 0.0304 0.0329
18:01-19:00, Sun., 15 Dec. 0.0347 0.0301 0.0325
17:01-18:00, Sun., 15 Dec. 0.0352 0.0305 0.0327
16:01-17:00, Sun., 15 Dec. 0.0349 0.0308 0.0326
15:01-16:00, Sun., 15 Dec. 0.0350 0.0296 0.0327
14:01-15:00, Sun., 15 Dec. 0.0350 0.0301 0.0328
13:01-14:00, Sun., 15 Dec. 0.0356 0.0305 0.0325
12:01-13:00, Sun., 15 Dec. 0.0353 0.0305 0.0326
11:01-12:00, Sun., 15 Dec. 0.0353 0.0304 0.0325
10:01-11:00, Sun., 15 Dec. 0.0352 0.0291 0.0324
09:01-10:00, Sun., 15 Dec. 0.0353 0.0302 0.0325
08:01-09:00, Sun., 15 Dec. 0.0343 0.0304 0.0323
07:01-08:00, Sun., 15 Dec. 0.0347 0.0297 0.0321
06:01-07:00, Sun., 15 Dec. 0.0348 0.0295 0.0322
05:01-06:00, Sun., 15 Dec. 0.0339 0.0300 0.0322
04:01-05:00, Sun., 15 Dec. 0.0365 0.0294 0.0324
03:01-04:00, Sun., 15 Dec. 0.0348 0.0295 0.0324
02:01-03:00, Sun., 15 Dec. 0.0349 0.0296 0.0322
01:01-02:00, Sun., 15 Dec. 0.0340 0.0289 0.0318
00:01-01:00, Sun., 15 Dec. 0.0341 0.0301 0.0320
23:01-24:00, Sat., 14 Dec. 0.0346 0.0301 0.0322
22:01-23:00, Sat., 14 Dec. 0.0346 0.0302 0.0321
21:01-22:00, Sat., 14 Dec. 0.0345 0.0303 0.0317
20:01-21:00, Sat., 14 Dec. 0.0346 0.0305 0.0323
19:01-20:00, Sat., 14 Dec. 0.0345 0.0301 0.0323
18:01-19:00, Sat., 14 Dec. 0.0346 0.0297 0.0321
17:01-18:00, Sat., 14 Dec. 0.0344 0.0295 0.0322
16:01-17:00, Sat., 14 Dec. 0.0346 0.0297 0.0323
15:01-16:00, Sat., 14 Dec. 0.0346 0.0301 0.0323
14:01-15:00, Sat., 14 Dec. 0.0344 0.0304 0.0323
13:01-14:00, Sat., 14 Dec. 0.0357 0.0301 0.0324
12:01-13:00, Sat., 14 Dec. 0.0346 0.0291 0.0324
11:01-12:00, Sat., 14 Dec. 0.0357 0.0305 0.0322
10:01-11:00, Sat., 14 Dec. 0.0342 0.0295 0.0324
09:01-10:00, Sat., 14 Dec. 0.0354 0.0297 0.0323
08:01-09:00, Sat., 14 Dec. 0.0352 0.0305 0.0325
07:01-08:00, Sat., 14 Dec. 0.0346 0.0304 0.0325
06:01-07:00, Sat., 14 Dec. 0.0357 0.0305 0.0330
05:01-06:00, Sat., 14 Dec. 0.0356 0.0302 0.0333
04:01-05:00, Sat., 14 Dec. 0.0370 0.0314 0.0337
03:01-04:00, Sat., 14 Dec. 0.0356 0.0315 0.0336
02:01-03:00, Sat., 14 Dec. 0.0360 0.0313 0.0337
01:01-02:00, Sat., 14 Dec. 0.0385 0.0324 0.0357
00:01-01:00, Sat., 14 Dec. 0.0395 0.0327 0.0355
23:01-24:00, Fri., 13 Dec. 0.0356 0.0309 0.0336
22:01-23:00, Fri., 13 Dec. 0.0346 0.0313 0.0333
21:01-22:00, Fri., 13 Dec. 0.0355 0.0311 0.0334
20:01-21:00, Fri., 13 Dec. 0.0356 0.0307 0.0333
19:01-20:00, Fri., 13 Dec. 0.0351 0.0313 0.0331
18:01-19:00, Fri., 13 Dec. 0.0356 0.0311 0.0328
17:01-18:00, Fri., 13 Dec. 0.0363 0.0309 0.0329
16:01-17:00, Fri., 13 Dec. 0.0349 0.0311 0.0327
15:01-16:00, Fri., 13 Dec. 0.0361 0.0304 0.0329
14:01-15:00, Fri., 13 Dec. 0.0346 0.0302 0.0326
13:01-14:00, Fri., 13 Dec. 0.0351 0.0304 0.0326
12:01-13:00, Fri., 13 Dec. 0.0351 0.0305 0.0326
11:01-12:00, Fri., 13 Dec. 0.0346 0.0292 0.0323
10:01-11:00, Fri., 13 Dec. 0.0343 0.0304 0.0323
09:01-10:00, Fri., 13 Dec. 0.0347 0.0296 0.0321
08:01-09:00, Fri., 13 Dec. 0.0346 0.0292 0.0320
07:01-08:00, Fri., 13 Dec. 0.0352 0.0289 0.0321
06:01-07:00, Fri., 13 Dec. 0.0359 0.0300 0.0325
05:01-06:00, Fri., 13 Dec. 0.0353 0.0297 0.0322
04:01-05:00, Fri., 13 Dec. 0.0346 0.0297 0.0321
03:01-04:00, Fri., 13 Dec. 0.0336 0.0298 0.0318
02:01-03:00, Fri., 13 Dec. 0.0343 0.0294 0.0319
01:01-02:00, Fri., 13 Dec. 0.0339 0.0294 0.0316
00:01-01:00, Fri., 13 Dec. 0.0349 0.0300 0.0320
23:01-24:00, Thu., 12 Dec. 0.0340 0.0301 0.0320
22:01-23:00, Thu., 12 Dec. 0.0351 0.0298 0.0321
21:01-22:00, Thu., 12 Dec. 0.0341 0.0300 0.0321
20:01-21:00, Thu., 12 Dec. 0.0346 0.0294 0.0319
19:01-20:00, Thu., 12 Dec. 0.0353 0.0288 0.0322
18:01-19:00, Thu., 12 Dec. 0.0339 0.0303 0.0320
17:01-18:00, Thu., 12 Dec. 0.0347 0.0295 0.0317
16:01-17:00, Thu., 12 Dec. 0.0344 0.0306 0.0322
15:01-16:00, Thu., 12 Dec. 0.0349 0.0305 0.0322
14:01-15:00, Thu., 12 Dec. 0.0349 0.0301 0.0321
13:01-14:00, Thu., 12 Dec. 0.0344 0.0297 0.0323
12:01-13:00, Thu., 12 Dec. 0.0345 0.0295 0.0321