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

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
13:01-14:00, Fri., 29 Mar. 0.0344 0.0279 0.0315
12:01-13:00, Fri., 29 Mar. 0.0359 0.0306 0.0333
11:01-12:00, Fri., 29 Mar. 0.0432 0.0333 0.0386
10:01-11:00, Fri., 29 Mar. 0.0430 0.0362 0.0391
09:01-10:00, Fri., 29 Mar. 0.0386 0.0342 0.0365
08:01-09:00, Fri., 29 Mar. 0.0399 0.0344 0.0368
07:01-08:00, Fri., 29 Mar. 0.0376 0.0315 0.0343
06:01-07:00, Fri., 29 Mar. 0.0388 0.0321 0.0352
05:01-06:00, Fri., 29 Mar. 0.0403 0.0353 0.0381
04:01-05:00, Fri., 29 Mar. 0.0418 0.0357 0.0387
03:01-04:00, Fri., 29 Mar. 0.0395 0.0356 0.0377
02:01-03:00, Fri., 29 Mar. 0.0404 0.0349 0.0379
01:01-02:00, Fri., 29 Mar. 0.0412 0.0347 0.0377
00:01-01:00, Fri., 29 Mar. 0.0415 0.0359 0.0390
23:01-24:00, Thu., 28 Mar. 0.0423 0.0354 0.0384
22:01-23:00, Thu., 28 Mar. 0.0375 0.0329 0.0354
21:01-22:00, Thu., 28 Mar. 0.0362 0.0304 0.0335
20:01-21:00, Thu., 28 Mar. 0.0342 0.0296 0.0322
19:01-20:00, Thu., 28 Mar. 0.0325 0.0283 0.0304
18:01-19:00, Thu., 28 Mar. 0.0309 0.0259 0.0282
17:01-18:00, Thu., 28 Mar. 0.0295 0.0250 0.0273
16:01-17:00, Thu., 28 Mar. 0.0293 0.0259 0.0274
15:01-16:00, Thu., 28 Mar. 0.0294 0.0247 0.0274
14:01-15:00, Thu., 28 Mar. 0.0297 0.0261 0.0276
13:01-14:00, Thu., 28 Mar. 0.0298 0.0253 0.0280
12:01-13:00, Thu., 28 Mar. 0.0302 0.0254 0.0280
11:01-12:00, Thu., 28 Mar. 0.0304 0.0263 0.0281
10:01-11:00, Thu., 28 Mar. 0.0298 0.0262 0.0283
09:01-10:00, Thu., 28 Mar. 0.0308 0.0262 0.0281
08:01-09:00, Thu., 28 Mar. 0.0298 0.0266 0.0283
07:01-08:00, Thu., 28 Mar. 0.0309 0.0263 0.0282
06:01-07:00, Thu., 28 Mar. 0.0304 0.0260 0.0281
05:01-06:00, Thu., 28 Mar. 0.0301 0.0257 0.0280
04:01-05:00, Thu., 28 Mar. 0.0306 0.0259 0.0279
03:01-04:00, Thu., 28 Mar. 0.0295 0.0253 0.0276
02:01-03:00, Thu., 28 Mar. 0.0293 0.0259 0.0276
01:01-02:00, Thu., 28 Mar. 0.0292 0.0257 0.0276
00:01-01:00, Thu., 28 Mar. 0.0294 0.0249 0.0274
23:01-24:00, Wed., 27 Mar. 0.0294 0.0251 0.0273
22:01-23:00, Wed., 27 Mar. 0.0297 0.0248 0.0271
21:01-22:00, Wed., 27 Mar. 0.0290 0.0256 0.0271
20:01-21:00, Wed., 27 Mar. 0.0301 0.0248 0.0271
19:01-20:00, Wed., 27 Mar. 0.0291 0.0245 0.0272
18:01-19:00, Wed., 27 Mar. 0.0298 0.0252 0.0272
17:01-18:00, Wed., 27 Mar. 0.0294 0.0253 0.0271
16:01-17:00, Wed., 27 Mar. 0.0288 0.0248 0.0271
15:01-16:00, Wed., 27 Mar. 0.0287 0.0255 0.0273
14:01-15:00, Wed., 27 Mar. 0.0298 0.0249 0.0271
13:01-14:00, Wed., 27 Mar. 0.0294 0.0252 0.0273
12:01-13:00, Wed., 27 Mar. 0.0301 0.0250 0.0273
11:01-12:00, Wed., 27 Mar. 0.0289 0.0257 0.0272
10:01-11:00, Wed., 27 Mar. 0.0289 0.0255 0.0271
09:01-10:00, Wed., 27 Mar. 0.0291 0.0254 0.0273
08:01-09:00, Wed., 27 Mar. 0.0294 0.0246 0.0272
07:01-08:00, Wed., 27 Mar. 0.0296 0.0251 0.0272
06:01-07:00, Wed., 27 Mar. 0.0293 0.0252 0.0272
05:01-06:00, Wed., 27 Mar. 0.0289 0.0249 0.0271
04:01-05:00, Wed., 27 Mar. 0.0302 0.0255 0.0273
03:01-04:00, Wed., 27 Mar. 0.0290 0.0254 0.0274
02:01-03:00, Wed., 27 Mar. 0.0301 0.0240 0.0275
01:01-02:00, Wed., 27 Mar. 0.0296 0.0259 0.0278
00:01-01:00, Wed., 27 Mar. 0.0310 0.0263 0.0284
23:01-24:00, Tue., 26 Mar. 0.0322 0.0279 0.0298
22:01-23:00, Tue., 26 Mar. 0.0363 0.0307 0.0339
21:01-22:00, Tue., 26 Mar. 0.0384 0.0323 0.0351
20:01-21:00, Tue., 26 Mar. 0.0431 0.0356 0.0391
19:01-20:00, Tue., 26 Mar. 0.0444 0.0389 0.0416
18:01-19:00, Tue., 26 Mar. 0.0471 0.0405 0.0437
17:01-18:00, Tue., 26 Mar. 0.0564 0.0424 0.0484
16:01-17:00, Tue., 26 Mar. 0.0635 0.0530 0.0583
15:01-16:00, Tue., 26 Mar. 0.0639 0.0509 0.0576
14:01-15:00, Tue., 26 Mar. 0.0570 0.0476 0.0523
13:01-14:00, Tue., 26 Mar. 0.0528 0.0433 0.0466
12:01-13:00, Tue., 26 Mar. 0.0544 0.0456 0.0495
11:01-12:00, Tue., 26 Mar. 0.0545 0.0468 0.0503
10:01-11:00, Tue., 26 Mar. 0.0541 0.0440 0.0490
09:01-10:00, Tue., 26 Mar. 0.0487 0.0427 0.0455
08:01-09:00, Tue., 26 Mar. 0.0471 0.0306 0.0390
07:01-08:00, Tue., 26 Mar. 0.0313 0.0269 0.0289
06:01-07:00, Tue., 26 Mar. 0.0320 0.0272 0.0292
05:01-06:00, Tue., 26 Mar. 0.0308 0.0262 0.0281
04:01-05:00, Tue., 26 Mar. 0.0302 0.0262 0.0280
03:01-04:00, Tue., 26 Mar. 0.0310 0.0262 0.0281
02:01-03:00, Tue., 26 Mar. 0.0308 0.0264 0.0288
01:01-02:00, Tue., 26 Mar. 0.0306 0.0265 0.0287
00:01-01:00, Tue., 26 Mar. 0.0308 0.0266 0.0286
23:01-24:00, Mon., 25 Mar. 0.0298 0.0259 0.0280
22:01-23:00, Mon., 25 Mar. 0.0301 0.0260 0.0281
21:01-22:00, Mon., 25 Mar. 0.0301 0.0257 0.0281
20:01-21:00, Mon., 25 Mar. 0.0295 0.0264 0.0280
19:01-20:00, Mon., 25 Mar. 0.0301 0.0256 0.0280
18:01-19:00, Mon., 25 Mar. 0.0307 0.0256 0.0280
17:01-18:00, Mon., 25 Mar. 0.0306 0.0262 0.0282
16:01-17:00, Mon., 25 Mar. 0.0312 0.0270 0.0288
15:01-16:00, Mon., 25 Mar. 0.0336 0.0276 0.0305
14:01-15:00, Mon., 25 Mar. 0.0353 0.0304 0.0327
13:01-14:00, Mon., 25 Mar. 0.0350 0.0307 0.0328
12:01-13:00, Mon., 25 Mar. 0.0357 0.0315 0.0333
11:01-12:00, Mon., 25 Mar. 0.0346 0.0308 0.0329
10:01-11:00, Mon., 25 Mar. 0.0387 0.0329 0.0358
09:01-10:00, Mon., 25 Mar. 0.0429 0.0366 0.0397
08:01-09:00, Mon., 25 Mar. 0.0437 0.0361 0.0402
07:01-08:00, Mon., 25 Mar. 0.0417 0.0346 0.0383
06:01-07:00, Mon., 25 Mar. 0.0449 0.0378 0.0402
05:01-06:00, Mon., 25 Mar. 0.0439 0.0381 0.0412
04:01-05:00, Mon., 25 Mar. 0.0420 0.0310 0.0355
03:01-04:00, Mon., 25 Mar. 0.0332 0.0270 0.0296
02:01-03:00, Mon., 25 Mar. 0.0321 0.0263 0.0290
01:01-02:00, Mon., 25 Mar. 0.0312 0.0259 0.0290
00:01-01:00, Mon., 25 Mar. 0.0310 0.0270 0.0293
23:01-24:00, Sun., 24 Mar. 0.0312 0.0266 0.0293
22:01-23:00, Sun., 24 Mar. 0.0308 0.0273 0.0290
21:01-22:00, Sun., 24 Mar. 0.0315 0.0276 0.0293
20:01-21:00, Sun., 24 Mar. 0.0344 0.0276 0.0311
19:01-20:00, Sun., 24 Mar. 0.0365 0.0300 0.0337
18:01-19:00, Sun., 24 Mar. 0.0367 0.0318 0.0345
17:01-18:00, Sun., 24 Mar. 0.0361 0.0272 0.0315
16:01-17:00, Sun., 24 Mar. 0.0305 0.0263 0.0284
15:01-16:00, Sun., 24 Mar. 0.0301 0.0267 0.0282
14:01-15:00, Sun., 24 Mar. 0.0303 0.0270 0.0286
13:01-14:00, Sun., 24 Mar. 0.0302 0.0267 0.0286
12:01-13:00, Sun., 24 Mar. 0.0307 0.0263 0.0287
11:01-12:00, Sun., 24 Mar. 0.0310 0.0273 0.0290
10:01-11:00, Sun., 24 Mar. 0.0311 0.0273 0.0291
09:01-10:00, Sun., 24 Mar. 0.0317 0.0272 0.0293
08:01-09:00, Sun., 24 Mar. 0.0318 0.0278 0.0296
07:01-08:00, Sun., 24 Mar. 0.0316 0.0263 0.0297
06:01-07:00, Sun., 24 Mar. 0.0325 0.0277 0.0299
05:01-06:00, Sun., 24 Mar. 0.0315 0.0273 0.0297
04:01-05:00, Sun., 24 Mar. 0.0312 0.0277 0.0292
03:01-04:00, Sun., 24 Mar. 0.0318 0.0270 0.0292
02:01-03:00, Sun., 24 Mar. 0.0321 0.0271 0.0292
01:01-02:00, Sun., 24 Mar. 0.0303 0.0266 0.0289
00:01-01:00, Sun., 24 Mar. 0.0315 0.0272 0.0290
23:01-24:00, Sat., 23 Mar. 0.0310 0.0266 0.0288
22:01-23:00, Sat., 23 Mar. 0.0302 0.0267 0.0283
21:01-22:00, Sat., 23 Mar. 0.0301 0.0262 0.0282
20:01-21:00, Sat., 23 Mar. 0.0308 0.0265 0.0284
19:01-20:00, Sat., 23 Mar. 0.0305 0.0263 0.0283
18:01-19:00, Sat., 23 Mar. 0.0307 0.0263 0.0285
17:01-18:00, Sat., 23 Mar. 0.0312 0.0269 0.0286
16:01-17:00, Sat., 23 Mar. 0.0312 0.0272 0.0291
15:01-16:00, Sat., 23 Mar. 0.0317 0.0261 0.0294
14:01-15:00, Sat., 23 Mar. 0.0315 0.0269 0.0291
13:01-14:00, Sat., 23 Mar. 0.0315 0.0274 0.0290
12:01-13:00, Sat., 23 Mar. 0.0310 0.0276 0.0294
11:01-12:00, Sat., 23 Mar. 0.0332 0.0278 0.0298
10:01-11:00, Sat., 23 Mar. 0.0312 0.0273 0.0292
09:01-10:00, Sat., 23 Mar. 0.0329 0.0283 0.0307
08:01-09:00, Sat., 23 Mar. 0.0342 0.0296 0.0325
07:01-08:00, Sat., 23 Mar. 0.0311 0.0271 0.0291
06:01-07:00, Sat., 23 Mar. 0.0316 0.0264 0.0289
05:01-06:00, Sat., 23 Mar. 0.0315 0.0270 0.0288
04:01-05:00, Sat., 23 Mar. 0.0309 0.0265 0.0287
03:01-04:00, Sat., 23 Mar. 0.0315 0.0263 0.0282
02:01-03:00, Sat., 23 Mar. 0.0294 0.0264 0.0281
01:01-02:00, Sat., 23 Mar. 0.0298 0.0261 0.0278
00:01-01:00, Sat., 23 Mar. 0.0301 0.0261 0.0281
23:01-24:00, Fri., 22 Mar. 0.0298 0.0256 0.0279
22:01-23:00, Fri., 22 Mar. 0.0298 0.0262 0.0279
21:01-22:00, Fri., 22 Mar. 0.0299 0.0252 0.0278
20:01-21:00, Fri., 22 Mar. 0.0305 0.0246 0.0276
19:01-20:00, Fri., 22 Mar. 0.0294 0.0259 0.0277
18:01-19:00, Fri., 22 Mar. 0.0294 0.0249 0.0274
17:01-18:00, Fri., 22 Mar. 0.0294 0.0255 0.0276
16:01-17:00, Fri., 22 Mar. 0.0298 0.0245 0.0280
15:01-16:00, Fri., 22 Mar. 0.0300 0.0255 0.0281
14:01-15:00, Fri., 22 Mar. 0.0298 0.0263 0.0280
13:01-14:00, Fri., 22 Mar. 0.0298 0.0257 0.0280
12:01-13:00, Fri., 22 Mar. 0.0310 0.0263 0.0281
11:01-12:00, Fri., 22 Mar. 0.0305 0.0263 0.0281
10:01-11:00, Fri., 22 Mar. 0.0310 0.0257 0.0283
09:01-10:00, Fri., 22 Mar. 0.0301 0.0266 0.0286
08:01-09:00, Fri., 22 Mar. 0.0307 0.0259 0.0283
07:01-08:00, Fri., 22 Mar. 0.0305 0.0273 0.0289
06:01-07:00, Fri., 22 Mar. 0.0314 0.0270 0.0287
05:01-06:00, Fri., 22 Mar. 0.0310 0.0265 0.0290
04:01-05:00, Fri., 22 Mar. 0.0315 0.0270 0.0288
03:01-04:00, Fri., 22 Mar. 0.0307 0.0264 0.0284
02:01-03:00, Fri., 22 Mar. 0.0304 0.0260 0.0284
01:01-02:00, Fri., 22 Mar. 0.0306 0.0262 0.0284
00:01-01:00, Fri., 22 Mar. 0.0311 0.0261 0.0283
23:01-24:00, Thu., 21 Mar. 0.0301 0.0255 0.0281
22:01-23:00, Thu., 21 Mar. 0.0301 0.0256 0.0282
21:01-22:00, Thu., 21 Mar. 0.0308 0.0264 0.0282
20:01-21:00, Thu., 21 Mar. 0.0294 0.0261 0.0280
19:01-20:00, Thu., 21 Mar. 0.0308 0.0259 0.0282
18:01-19:00, Thu., 21 Mar. 0.0312 0.0266 0.0283
17:01-18:00, Thu., 21 Mar. 0.0303 0.0260 0.0281
16:01-17:00, Thu., 21 Mar. 0.0304 0.0263 0.0285
15:01-16:00, Thu., 21 Mar. 0.0308 0.0259 0.0284
14:01-15:00, Thu., 21 Mar. 0.0312 0.0266 0.0283
13:01-14:00, Thu., 21 Mar. 0.0308 0.0255 0.0285
12:01-13:00, Thu., 21 Mar. 0.0304 0.0255 0.0283
11:01-12:00, Thu., 21 Mar. 0.0296 0.0249 0.0278
10:01-11:00, Thu., 21 Mar. 0.0298 0.0259 0.0279
09:01-10:00, Thu., 21 Mar. 0.0307 0.0261 0.0281
08:01-09:00, Thu., 21 Mar. 0.0304 0.0255 0.0280
07:01-08:00, Thu., 21 Mar. 0.0300 0.0255 0.0279
06:01-07:00, Thu., 21 Mar. 0.0299 0.0252 0.0281
05:01-06:00, Thu., 21 Mar. 0.0300 0.0262 0.0282
04:01-05:00, Thu., 21 Mar. 0.0303 0.0263 0.0285
03:01-04:00, Thu., 21 Mar. 0.0307 0.0263 0.0284
02:01-03:00, Thu., 21 Mar. 0.0297 0.0261 0.0279
01:01-02:00, Thu., 21 Mar. 0.0304 0.0260 0.0281
00:01-01:00, Thu., 21 Mar. 0.0301 0.0266 0.0281
23:01-24:00, Wed., 20 Mar. 0.0301 0.0259 0.0281
22:01-23:00, Wed., 20 Mar. 0.0305 0.0254 0.0281
21:01-22:00, Wed., 20 Mar. 0.0301 0.0263 0.0279
20:01-21:00, Wed., 20 Mar. 0.0308 0.0263 0.0282
19:01-20:00, Wed., 20 Mar. 0.0308 0.0262 0.0283
18:01-19:00, Wed., 20 Mar. 0.0317 0.0278 0.0297
17:01-18:00, Wed., 20 Mar. 0.0388 0.0297 0.0338
16:01-17:00, Wed., 20 Mar. 0.0452 0.0279 0.0392
15:01-16:00, Wed., 20 Mar. 0.0325 0.0280 0.0303
14:01-15:00, Wed., 20 Mar. 0.0388 0.0300 0.0341
13:01-14:00, Wed., 20 Mar. 0.0481 0.0361 0.0423
12:01-13:00, Wed., 20 Mar. 0.0405 0.0265 0.0306
11:01-12:00, Wed., 20 Mar. 0.0310 0.0264 0.0289
10:01-11:00, Wed., 20 Mar. 0.0315 0.0278 0.0295
09:01-10:00, Wed., 20 Mar. 0.0331 0.0280 0.0301
08:01-09:00, Wed., 20 Mar. 0.0322 0.0277 0.0298
07:01-08:00, Wed., 20 Mar. 0.0319 0.0276 0.0299
06:01-07:00, Wed., 20 Mar. 0.0320 0.0273 0.0300
05:01-06:00, Wed., 20 Mar. 0.0318 0.0276 0.0298
04:01-05:00, Wed., 20 Mar. 0.0311 0.0266 0.0289
03:01-04:00, Wed., 20 Mar. 0.0318 0.0264 0.0288
02:01-03:00, Wed., 20 Mar. 0.0312 0.0268 0.0287
01:01-02:00, Wed., 20 Mar. 0.0310 0.0268 0.0290
00:01-01:00, Wed., 20 Mar. 0.0314 0.0263 0.0288
23:01-24:00, Tue., 19 Mar. 0.0302 0.0257 0.0283
22:01-23:00, Tue., 19 Mar. 0.0303 0.0261 0.0281
21:01-22:00, Tue., 19 Mar. 0.0299 0.0254 0.0281
20:01-21:00, Tue., 19 Mar. 0.0311 0.0260 0.0279
19:01-20:00, Tue., 19 Mar. 0.0298 0.0259 0.0277
18:01-19:00, Tue., 19 Mar. 0.0297 0.0257 0.0280
17:01-18:00, Tue., 19 Mar. 0.0308 0.0262 0.0280
16:01-17:00, Tue., 19 Mar. 0.0297 0.0260 0.0279
15:01-16:00, Tue., 19 Mar. 0.0303 0.0263 0.0282
14:01-15:00, Tue., 19 Mar. 0.0301 0.0268 0.0284