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
16:01-17:00, Sat., 27 Jul. 0.0311 0.0266 0.0284
15:01-16:00, Sat., 27 Jul. 0.0301 0.0263 0.0282
14:01-15:00, Sat., 27 Jul. 0.0296 0.0260 0.0278
13:01-14:00, Sat., 27 Jul. 0.0301 0.0260 0.0280
12:01-13:00, Sat., 27 Jul. 0.0308 0.0255 0.0280
11:01-12:00, Sat., 27 Jul. 0.0299 0.0260 0.0280
10:01-11:00, Sat., 27 Jul. 0.0297 0.0264 0.0283
09:01-10:00, Sat., 27 Jul. 0.0305 0.0260 0.0282
08:01-09:00, Sat., 27 Jul. 0.0313 0.0260 0.0283
07:01-08:00, Sat., 27 Jul. 0.0302 0.0272 0.0286
06:01-07:00, Sat., 27 Jul. 0.0319 0.0270 0.0290
05:01-06:00, Sat., 27 Jul. 0.0307 0.0265 0.0286
04:01-05:00, Sat., 27 Jul. 0.0298 0.0265 0.0283
03:01-04:00, Sat., 27 Jul. 0.0302 0.0264 0.0282
02:01-03:00, Sat., 27 Jul. 0.0303 0.0263 0.0283
01:01-02:00, Sat., 27 Jul. 0.0308 0.0267 0.0282
00:01-01:00, Sat., 27 Jul. 0.0306 0.0265 0.0287
23:01-24:00, Fri., 26 Jul. 0.0335 0.0274 0.0298
22:01-23:00, Fri., 26 Jul. 0.0373 0.0303 0.0334
21:01-22:00, Fri., 26 Jul. 0.0356 0.0289 0.0323
20:01-21:00, Fri., 26 Jul. 0.0305 0.0254 0.0283
19:01-20:00, Fri., 26 Jul. 0.0304 0.0256 0.0278
18:01-19:00, Fri., 26 Jul. 0.0295 0.0250 0.0278
17:01-18:00, Fri., 26 Jul. 0.0298 0.0256 0.0278
16:01-17:00, Fri., 26 Jul. 0.0307 0.0252 0.0282
15:01-16:00, Fri., 26 Jul. 0.0304 0.0255 0.0281
14:01-15:00, Fri., 26 Jul. 0.0298 0.0259 0.0279
13:01-14:00, Fri., 26 Jul. 0.0303 0.0259 0.0282
12:01-13:00, Fri., 26 Jul. 0.0298 0.0252 0.0280
11:01-12:00, Fri., 26 Jul. 0.0303 0.0258 0.0282
10:01-11:00, Fri., 26 Jul. 0.0307 0.0262 0.0284
09:01-10:00, Fri., 26 Jul. 0.0309 0.0270 0.0287
08:01-09:00, Fri., 26 Jul. 0.0309 0.0273 0.0290
07:01-08:00, Fri., 26 Jul. 0.0326 0.0273 0.0293
06:01-07:00, Fri., 26 Jul. 0.0304 0.0266 0.0285
05:01-06:00, Fri., 26 Jul. 0.0313 0.0273 0.0287
04:01-05:00, Fri., 26 Jul. 0.0314 0.0260 0.0287
03:01-04:00, Fri., 26 Jul. 0.0304 0.0261 0.0283
02:01-03:00, Fri., 26 Jul. 0.0310 0.0262 0.0285
01:01-02:00, Fri., 26 Jul. 0.0314 0.0266 0.0287
00:01-01:00, Fri., 26 Jul. 0.0310 0.0270 0.0287
23:01-24:00, Thu., 25 Jul. 0.0301 0.0266 0.0283
22:01-23:00, Thu., 25 Jul. 0.0308 0.0265 0.0283
21:01-22:00, Thu., 25 Jul. 0.0311 0.0266 0.0289
20:01-21:00, Thu., 25 Jul. 0.0337 0.0289 0.0310
19:01-20:00, Thu., 25 Jul. 0.0422 0.0314 0.0361
18:01-19:00, Thu., 25 Jul. 0.0444 0.0309 0.0378
17:01-18:00, Thu., 25 Jul. 0.0336 0.0262 0.0293
16:01-17:00, Thu., 25 Jul. 0.0296 0.0257 0.0279
15:01-16:00, Thu., 25 Jul. 0.0299 0.0258 0.0279
14:01-15:00, Thu., 25 Jul. 0.0297 0.0255 0.0280
13:01-14:00, Thu., 25 Jul. 0.0310 0.0263 0.0283
12:01-13:00, Thu., 25 Jul. 0.0305 0.0272 0.0285
11:01-12:00, Thu., 25 Jul. 0.0304 0.0267 0.0287
10:01-11:00, Thu., 25 Jul. 0.0308 0.0269 0.0288
09:01-10:00, Thu., 25 Jul. 0.0310 0.0269 0.0287
08:01-09:00, Thu., 25 Jul. 0.0310 0.0269 0.0287
07:01-08:00, Thu., 25 Jul. 0.0311 0.0273 0.0292
06:01-07:00, Thu., 25 Jul. 0.0314 0.0266 0.0292
05:01-06:00, Thu., 25 Jul. 0.0325 0.0283 0.0302
04:01-05:00, Thu., 25 Jul. 0.0335 0.0277 0.0304
03:01-04:00, Thu., 25 Jul. 0.0335 0.0280 0.0297
02:01-03:00, Thu., 25 Jul. 0.0306 0.0265 0.0285
01:01-02:00, Thu., 25 Jul. 0.0297 0.0263 0.0283
00:01-01:00, Thu., 25 Jul. 0.0305 0.0266 0.0286
23:01-24:00, Wed., 24 Jul. 0.0305 0.0261 0.0280
22:01-23:00, Wed., 24 Jul. 0.0299 0.0259 0.0280
21:01-22:00, Wed., 24 Jul. 0.0295 0.0250 0.0278
20:01-21:00, Wed., 24 Jul. 0.0294 0.0262 0.0279
19:01-20:00, Wed., 24 Jul. 0.0298 0.0259 0.0274
18:01-19:00, Wed., 24 Jul. 0.0292 0.0256 0.0277
17:01-18:00, Wed., 24 Jul. 0.0298 0.0259 0.0279
16:01-17:00, Wed., 24 Jul. 0.0303 0.0257 0.0278
15:01-16:00, Wed., 24 Jul. 0.0298 0.0266 0.0283
14:01-15:00, Wed., 24 Jul. 0.0321 0.0265 0.0294
13:01-14:00, Wed., 24 Jul. 0.0360 0.0292 0.0326
12:01-13:00, Wed., 24 Jul. 0.0374 0.0254 0.0310
11:01-12:00, Wed., 24 Jul. 0.0311 0.0265 0.0285
10:01-11:00, Wed., 24 Jul. 0.0301 0.0256 0.0286
09:01-10:00, Wed., 24 Jul. 0.0310 0.0253 0.0288
08:01-09:00, Wed., 24 Jul. 0.0313 0.0264 0.0286
07:01-08:00, Wed., 24 Jul. 0.0305 0.0267 0.0286
06:01-07:00, Wed., 24 Jul. 0.0311 0.0257 0.0287
05:01-06:00, Wed., 24 Jul. 0.0311 0.0265 0.0291
04:01-05:00, Wed., 24 Jul. 0.0311 0.0272 0.0289
03:01-04:00, Wed., 24 Jul. 0.0308 0.0266 0.0288
02:01-03:00, Wed., 24 Jul. 0.0311 0.0262 0.0283
01:01-02:00, Wed., 24 Jul. 0.0299 0.0259 0.0280
00:01-01:00, Wed., 24 Jul. 0.0305 0.0259 0.0285
23:01-24:00, Tue., 23 Jul. 0.0296 0.0250 0.0278
22:01-23:00, Tue., 23 Jul. 0.0301 0.0253 0.0280
21:01-22:00, Tue., 23 Jul. 0.0299 0.0254 0.0277
20:01-21:00, Tue., 23 Jul. 0.0305 0.0256 0.0280
19:01-20:00, Tue., 23 Jul. 0.0309 0.0256 0.0279
18:01-19:00, Tue., 23 Jul. 0.0305 0.0251 0.0282
17:01-18:00, Tue., 23 Jul. 0.0304 0.0259 0.0281
16:01-17:00, Tue., 23 Jul. 0.0295 0.0260 0.0278
15:01-16:00, Tue., 23 Jul. 0.0301 0.0254 0.0279
14:01-15:00, Tue., 23 Jul. 0.0301 0.0259 0.0279
13:01-14:00, Tue., 23 Jul. 0.0301 0.0257 0.0279
12:01-13:00, Tue., 23 Jul. 0.0299 0.0264 0.0280
11:01-12:00, Tue., 23 Jul. 0.0302 0.0256 0.0280
10:01-11:00, Tue., 23 Jul. 0.0301 0.0261 0.0280
09:01-10:00, Tue., 23 Jul. 0.0307 0.0262 0.0283
08:01-09:00, Tue., 23 Jul. 0.0303 0.0261 0.0283
07:01-08:00, Tue., 23 Jul. 0.0308 0.0266 0.0287
06:01-07:00, Tue., 23 Jul. 0.0307 0.0266 0.0289
05:01-06:00, Tue., 23 Jul. 0.0315 0.0259 0.0286
04:01-05:00, Tue., 23 Jul. 0.0302 0.0254 0.0282
03:01-04:00, Tue., 23 Jul. 0.0300 0.0257 0.0279
02:01-03:00, Tue., 23 Jul. 0.0303 0.0256 0.0282
01:01-02:00, Tue., 23 Jul. 0.0303 0.0266 0.0282
00:01-01:00, Tue., 23 Jul. 0.0321 0.0272 0.0290
23:01-24:00, Mon., 22 Jul. 0.0372 0.0280 0.0322
22:01-23:00, Mon., 22 Jul. 0.0515 0.0343 0.0418
21:01-22:00, Mon., 22 Jul. 0.0612 0.0282 0.0504
20:01-21:00, Mon., 22 Jul. 0.0333 0.0280 0.0308
19:01-20:00, Mon., 22 Jul. 0.0353 0.0268 0.0305
18:01-19:00, Mon., 22 Jul. 0.0301 0.0265 0.0285
17:01-18:00, Mon., 22 Jul. 0.0308 0.0261 0.0286
16:01-17:00, Mon., 22 Jul. 0.0312 0.0264 0.0284
15:01-16:00, Mon., 22 Jul. 0.0308 0.0268 0.0285
14:01-15:00, Mon., 22 Jul. 0.0301 0.0261 0.0282
13:01-14:00, Mon., 22 Jul. 0.0306 0.0259 0.0285
12:01-13:00, Mon., 22 Jul. 0.0307 0.0268 0.0286
11:01-12:00, Mon., 22 Jul. 0.0304 0.0263 0.0284
10:01-11:00, Mon., 22 Jul. 0.0315 0.0262 0.0287
09:01-10:00, Mon., 22 Jul. 0.0310 0.0255 0.0284
08:01-09:00, Mon., 22 Jul. 0.0310 0.0262 0.0283
07:01-08:00, Mon., 22 Jul. 0.0304 0.0270 0.0285
06:01-07:00, Mon., 22 Jul. 0.0310 0.0269 0.0284
05:01-06:00, Mon., 22 Jul. 0.0304 0.0267 0.0282
04:01-05:00, Mon., 22 Jul. 0.0297 0.0254 0.0281
03:01-04:00, Mon., 22 Jul. 0.0304 0.0260 0.0281
02:01-03:00, Mon., 22 Jul. 0.0296 0.0249 0.0277
01:01-02:00, Mon., 22 Jul. 0.0301 0.0256 0.0279
00:01-01:00, Mon., 22 Jul. 0.0294 0.0255 0.0277
23:01-24:00, Sun., 21 Jul. 0.0295 0.0255 0.0279
22:01-23:00, Sun., 21 Jul. 0.0301 0.0259 0.0280
21:01-22:00, Sun., 21 Jul. 0.0303 0.0261 0.0280
20:01-21:00, Sun., 21 Jul. 0.0294 0.0256 0.0277
19:01-20:00, Sun., 21 Jul. 0.0298 0.0257 0.0277
18:01-19:00, Sun., 21 Jul. 0.0298 0.0255 0.0276
17:01-18:00, Sun., 21 Jul. 0.0299 0.0262 0.0279
16:01-17:00, Sun., 21 Jul. 0.0297 0.0260 0.0277
15:01-16:00, Sun., 21 Jul. 0.0303 0.0263 0.0279
14:01-15:00, Sun., 21 Jul. 0.0294 0.0262 0.0275
13:01-14:00, Sun., 21 Jul. 0.0297 0.0255 0.0277
12:01-13:00, Sun., 21 Jul. 0.0305 0.0263 0.0281
11:01-12:00, Sun., 21 Jul. 0.0305 0.0260 0.0283
10:01-11:00, Sun., 21 Jul. 0.0297 0.0265 0.0281
09:01-10:00, Sun., 21 Jul. 0.0301 0.0262 0.0281
08:01-09:00, Sun., 21 Jul. 0.0297 0.0255 0.0280
07:01-08:00, Sun., 21 Jul. 0.0308 0.0266 0.0282
06:01-07:00, Sun., 21 Jul. 0.0314 0.0274 0.0292
05:01-06:00, Sun., 21 Jul. 0.0339 0.0290 0.0313
04:01-05:00, Sun., 21 Jul. 0.0395 0.0310 0.0356
03:01-04:00, Sun., 21 Jul. 0.0422 0.0262 0.0335
02:01-03:00, Sun., 21 Jul. 0.0304 0.0262 0.0284
01:01-02:00, Sun., 21 Jul. 0.0360 0.0270 0.0310
00:01-01:00, Sun., 21 Jul. 0.0464 0.0329 0.0394
23:01-24:00, Sat., 20 Jul. 0.0554 0.0385 0.0487
22:01-23:00, Sat., 20 Jul. 0.0413 0.0313 0.0355
21:01-22:00, Sat., 20 Jul. 0.0482 0.0387 0.0438
20:01-21:00, Sat., 20 Jul. 0.0426 0.0311 0.0345
19:01-20:00, Sat., 20 Jul. 0.0435 0.0340 0.0388
18:01-19:00, Sat., 20 Jul. 0.0511 0.0341 0.0456
17:01-18:00, Sat., 20 Jul. 0.0325 0.0259 0.0285
16:01-17:00, Sat., 20 Jul. 0.0304 0.0265 0.0286
15:01-16:00, Sat., 20 Jul. 0.0310 0.0266 0.0287
14:01-15:00, Sat., 20 Jul. 0.0309 0.0274 0.0290
13:01-14:00, Sat., 20 Jul. 0.0308 0.0263 0.0288
12:01-13:00, Sat., 20 Jul. 0.0303 0.0264 0.0283
11:01-12:00, Sat., 20 Jul. 0.0304 0.0266 0.0284
10:01-11:00, Sat., 20 Jul. 0.0300 0.0265 0.0283
09:01-10:00, Sat., 20 Jul. 0.0301 0.0263 0.0281
08:01-09:00, Sat., 20 Jul. 0.0322 0.0264 0.0283
07:01-08:00, Sat., 20 Jul. 0.0319 0.0272 0.0292
06:01-07:00, Sat., 20 Jul. 0.0315 0.0273 0.0289
05:01-06:00, Sat., 20 Jul. 0.0313 0.0267 0.0288
04:01-05:00, Sat., 20 Jul. 0.0308 0.0267 0.0288
03:01-04:00, Sat., 20 Jul. 0.0316 0.0263 0.0283
02:01-03:00, Sat., 20 Jul. 0.0304 0.0256 0.0283
01:01-02:00, Sat., 20 Jul. 0.0299 0.0263 0.0282
00:01-01:00, Sat., 20 Jul. 0.0302 0.0260 0.0278
23:01-24:00, Fri., 19 Jul. 0.0299 0.0257 0.0279
22:01-23:00, Fri., 19 Jul. 0.0306 0.0252 0.0278
21:01-22:00, Fri., 19 Jul. 0.0296 0.0259 0.0279
20:01-21:00, Fri., 19 Jul. 0.0306 0.0260 0.0278
19:01-20:00, Fri., 19 Jul. 0.0303 0.0246 0.0277
18:01-19:00, Fri., 19 Jul. 0.0297 0.0262 0.0278
17:01-18:00, Fri., 19 Jul. 0.0300 0.0260 0.0277
16:01-17:00, Fri., 19 Jul. 0.0301 0.0255 0.0275
15:01-16:00, Fri., 19 Jul. 0.0305 0.0263 0.0280
14:01-15:00, Fri., 19 Jul. 0.0296 0.0262 0.0277
13:01-14:00, Fri., 19 Jul. 0.0292 0.0250 0.0275
12:01-13:00, Fri., 19 Jul. 0.0300 0.0249 0.0276
11:01-12:00, Fri., 19 Jul. 0.0301 0.0261 0.0276
10:01-11:00, Fri., 19 Jul. 0.0290 0.0250 0.0276
09:01-10:00, Fri., 19 Jul. 0.0293 0.0255 0.0276
08:01-09:00, Fri., 19 Jul. 0.0305 0.0258 0.0281
07:01-08:00, Fri., 19 Jul. 0.0309 0.0271 0.0291
06:01-07:00, Fri., 19 Jul. 0.0313 0.0278 0.0298
05:01-06:00, Fri., 19 Jul. 0.0327 0.0279 0.0306
04:01-05:00, Fri., 19 Jul. 0.0322 0.0280 0.0303
03:01-04:00, Fri., 19 Jul. 0.0306 0.0259 0.0280
02:01-03:00, Fri., 19 Jul. 0.0300 0.0259 0.0280
01:01-02:00, Fri., 19 Jul. 0.0292 0.0263 0.0276
00:01-01:00, Fri., 19 Jul. 0.0298 0.0253 0.0276
23:01-24:00, Thu., 18 Jul. 0.0301 0.0247 0.0275
22:01-23:00, Thu., 18 Jul. 0.0297 0.0255 0.0275
21:01-22:00, Thu., 18 Jul. 0.0297 0.0258 0.0278
20:01-21:00, Thu., 18 Jul. 0.0305 0.0258 0.0278
19:01-20:00, Thu., 18 Jul. 0.0294 0.0253 0.0278
18:01-19:00, Thu., 18 Jul. 0.0301 0.0258 0.0280
17:01-18:00, Thu., 18 Jul. 0.0306 0.0261 0.0281
16:01-17:00, Thu., 18 Jul. 0.0294 0.0259 0.0280
15:01-16:00, Thu., 18 Jul. 0.0299 0.0259 0.0280
14:01-15:00, Thu., 18 Jul. 0.0300 0.0259 0.0281
13:01-14:00, Thu., 18 Jul. 0.0303 0.0246 0.0281
12:01-13:00, Thu., 18 Jul. 0.0298 0.0259 0.0280
11:01-12:00, Thu., 18 Jul. 0.0306 0.0262 0.0280
10:01-11:00, Thu., 18 Jul. 0.0298 0.0262 0.0280
09:01-10:00, Thu., 18 Jul. 0.0294 0.0260 0.0279
08:01-09:00, Thu., 18 Jul. 0.0304 0.0258 0.0279
07:01-08:00, Thu., 18 Jul. 0.0297 0.0260 0.0278
06:01-07:00, Thu., 18 Jul. 0.0302 0.0263 0.0281
05:01-06:00, Thu., 18 Jul. 0.0296 0.0268 0.0280
04:01-05:00, Thu., 18 Jul. 0.0302 0.0259 0.0278
03:01-04:00, Thu., 18 Jul. 0.0301 0.0256 0.0279
02:01-03:00, Thu., 18 Jul. 0.0301 0.0259 0.0279
01:01-02:00, Thu., 18 Jul. 0.0298 0.0262 0.0279
00:01-01:00, Thu., 18 Jul. 0.0294 0.0254 0.0276
23:01-24:00, Wed., 17 Jul. 0.0296 0.0249 0.0276
22:01-23:00, Wed., 17 Jul. 0.0301 0.0256 0.0277
21:01-22:00, Wed., 17 Jul. 0.0293 0.0254 0.0275
20:01-21:00, Wed., 17 Jul. 0.0296 0.0256 0.0275
19:01-20:00, Wed., 17 Jul. 0.0305 0.0249 0.0275
18:01-19:00, Wed., 17 Jul. 0.0308 0.0255 0.0276
17:01-18:00, Wed., 17 Jul. 0.0311 0.0267 0.0288