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
07:01-08:00, Thu., 13 Jun. 0.0312 0.0273 0.0292
06:01-07:00, Thu., 13 Jun. 0.0327 0.0280 0.0299
05:01-06:00, Thu., 13 Jun. 0.0318 0.0266 0.0293
04:01-05:00, Thu., 13 Jun. 0.0304 0.0265 0.0280
03:01-04:00, Thu., 13 Jun. 0.0297 0.0253 0.0279
02:01-03:00, Thu., 13 Jun. 0.0297 0.0262 0.0279
01:01-02:00, Thu., 13 Jun. 0.0304 0.0251 0.0280
00:01-01:00, Thu., 13 Jun. 0.0304 0.0258 0.0279
23:01-24:00, Wed., 12 Jun. 0.0303 0.0249 0.0278
22:01-23:00, Wed., 12 Jun. 0.0299 0.0255 0.0277
21:01-22:00, Wed., 12 Jun. 0.0296 0.0261 0.0275
20:01-21:00, Wed., 12 Jun. 0.0294 0.0249 0.0275
19:01-20:00, Wed., 12 Jun. 0.0292 0.0261 0.0278
18:01-19:00, Wed., 12 Jun. 0.0304 0.0252 0.0277
17:01-18:00, Wed., 12 Jun. 0.0302 0.0262 0.0277
16:01-17:00, Wed., 12 Jun. 0.0299 0.0252 0.0278
15:01-16:00, Wed., 12 Jun. 0.0297 0.0259 0.0279
14:01-15:00, Wed., 12 Jun. 0.0304 0.0255 0.0278
13:01-14:00, Wed., 12 Jun. 0.0294 0.0260 0.0278
12:01-13:00, Wed., 12 Jun. 0.0301 0.0266 0.0280
11:01-12:00, Wed., 12 Jun. 0.0297 0.0257 0.0279
10:01-11:00, Wed., 12 Jun. 0.0302 0.0263 0.0279
09:01-10:00, Wed., 12 Jun. 0.0301 0.0261 0.0282
08:01-09:00, Wed., 12 Jun. 0.0316 0.0260 0.0283
07:01-08:00, Wed., 12 Jun. 0.0303 0.0261 0.0282
06:01-07:00, Wed., 12 Jun. 0.0312 0.0275 0.0287
05:01-06:00, Wed., 12 Jun. 0.0304 0.0269 0.0285
04:01-05:00, Wed., 12 Jun. 0.0307 0.0259 0.0284
03:01-04:00, Wed., 12 Jun. 0.0300 0.0256 0.0280
02:01-03:00, Wed., 12 Jun. 0.0291 0.0263 0.0277
01:01-02:00, Wed., 12 Jun. 0.0296 0.0263 0.0278
00:01-01:00, Wed., 12 Jun. 0.0309 0.0254 0.0277
23:01-24:00, Tue., 11 Jun. 0.0295 0.0258 0.0278
22:01-23:00, Tue., 11 Jun. 0.0300 0.0256 0.0277
21:01-22:00, Tue., 11 Jun. 0.0296 0.0250 0.0276
20:01-21:00, Tue., 11 Jun. 0.0297 0.0260 0.0275
19:01-20:00, Tue., 11 Jun. 0.0294 0.0259 0.0277
18:01-19:00, Tue., 11 Jun. 0.0298 0.0256 0.0278
17:01-18:00, Tue., 11 Jun. 0.0294 0.0255 0.0276
16:01-17:00, Tue., 11 Jun. 0.0296 0.0252 0.0277
15:01-16:00, Tue., 11 Jun. 0.0291 0.0256 0.0278
14:01-15:00, Tue., 11 Jun. 0.0298 0.0261 0.0277
13:01-14:00, Tue., 11 Jun. 0.0298 0.0249 0.0275
12:01-13:00, Tue., 11 Jun. 0.0302 0.0256 0.0278
11:01-12:00, Tue., 11 Jun. 0.0301 0.0245 0.0276
10:01-11:00, Tue., 11 Jun. 0.0298 0.0256 0.0276
09:01-10:00, Tue., 11 Jun. 0.0298 0.0262 0.0275
08:01-09:00, Tue., 11 Jun. 0.0298 0.0263 0.0280
07:01-08:00, Tue., 11 Jun. 0.0310 0.0259 0.0288
06:01-07:00, Tue., 11 Jun. 0.0304 0.0259 0.0286
05:01-06:00, Tue., 11 Jun. 0.0297 0.0259 0.0277
04:01-05:00, Tue., 11 Jun. 0.0293 0.0249 0.0271
03:01-04:00, Tue., 11 Jun. 0.0291 0.0246 0.0275
02:01-03:00, Tue., 11 Jun. 0.0292 0.0252 0.0271
01:01-02:00, Tue., 11 Jun. 0.0296 0.0252 0.0275
00:01-01:00, Tue., 11 Jun. 0.0293 0.0258 0.0275
23:01-24:00, Mon., 10 Jun. 0.0291 0.0249 0.0275
22:01-23:00, Mon., 10 Jun. 0.0304 0.0259 0.0275
21:01-22:00, Mon., 10 Jun. 0.0291 0.0252 0.0274
20:01-21:00, Mon., 10 Jun. 0.0295 0.0257 0.0275
19:01-20:00, Mon., 10 Jun. 0.0290 0.0254 0.0272
18:01-19:00, Mon., 10 Jun. 0.0297 0.0256 0.0273
17:01-18:00, Mon., 10 Jun. 0.0292 0.0249 0.0274
16:01-17:00, Mon., 10 Jun. 0.0290 0.0255 0.0274
15:01-16:00, Mon., 10 Jun. 0.0287 0.0252 0.0271
14:01-15:00, Mon., 10 Jun. 0.0295 0.0256 0.0273
13:01-14:00, Mon., 10 Jun. 0.0288 0.0252 0.0270
12:01-13:00, Mon., 10 Jun. 0.0298 0.0242 0.0274
11:01-12:00, Mon., 10 Jun. 0.0297 0.0246 0.0272
10:01-11:00, Mon., 10 Jun. 0.0293 0.0238 0.0271
09:01-10:00, Mon., 10 Jun. 0.0295 0.0249 0.0273
08:01-09:00, Mon., 10 Jun. 0.0304 0.0256 0.0275
07:01-08:00, Mon., 10 Jun. 0.0324 0.0263 0.0287
06:01-07:00, Mon., 10 Jun. 0.0353 0.0281 0.0313
05:01-06:00, Mon., 10 Jun. 0.0374 0.0332 0.0348
04:01-05:00, Mon., 10 Jun. 0.0400 0.0335 0.0369
03:01-04:00, Mon., 10 Jun. 0.0381 0.0336 0.0359
02:01-03:00, Mon., 10 Jun. 0.0392 0.0327 0.0356
01:01-02:00, Mon., 10 Jun. 0.0387 0.0333 0.0360
00:01-01:00, Mon., 10 Jun. 0.0386 0.0311 0.0343
23:01-24:00, Sun., 09 Jun. 0.0340 0.0276 0.0301
22:01-23:00, Sun., 09 Jun. 0.0311 0.0268 0.0290
21:01-22:00, Sun., 09 Jun. 0.0308 0.0265 0.0287
20:01-21:00, Sun., 09 Jun. 0.0304 0.0258 0.0279
19:01-20:00, Sun., 09 Jun. 0.0298 0.0258 0.0279
18:01-19:00, Sun., 09 Jun. 0.0294 0.0262 0.0277
17:01-18:00, Sun., 09 Jun. 0.0301 0.0264 0.0277
16:01-17:00, Sun., 09 Jun. 0.0299 0.0249 0.0279
15:01-16:00, Sun., 09 Jun. 0.0300 0.0257 0.0278
14:01-15:00, Sun., 09 Jun. 0.0290 0.0254 0.0275
13:01-14:00, Sun., 09 Jun. 0.0309 0.0259 0.0279
12:01-13:00, Sun., 09 Jun. 0.0295 0.0253 0.0276
11:01-12:00, Sun., 09 Jun. 0.0301 0.0255 0.0278
10:01-11:00, Sun., 09 Jun. 0.0297 0.0257 0.0276
09:01-10:00, Sun., 09 Jun. 0.0301 0.0252 0.0279
08:01-09:00, Sun., 09 Jun. 0.0310 0.0255 0.0278
07:01-08:00, Sun., 09 Jun. 0.0299 0.0261 0.0281
06:01-07:00, Sun., 09 Jun. 0.0303 0.0263 0.0284
05:01-06:00, Sun., 09 Jun. 0.0302 0.0261 0.0279
04:01-05:00, Sun., 09 Jun. 0.0294 0.0261 0.0280
03:01-04:00, Sun., 09 Jun. 0.0303 0.0255 0.0279
02:01-03:00, Sun., 09 Jun. 0.0301 0.0253 0.0276
01:01-02:00, Sun., 09 Jun. 0.0303 0.0259 0.0277
00:01-01:00, Sun., 09 Jun. 0.0304 0.0255 0.0276
23:01-24:00, Sat., 08 Jun. 0.0292 0.0262 0.0275
22:01-23:00, Sat., 08 Jun. 0.0297 0.0255 0.0276
21:01-22:00, Sat., 08 Jun. 0.0298 0.0258 0.0277
20:01-21:00, Sat., 08 Jun. 0.0303 0.0254 0.0277
19:01-20:00, Sat., 08 Jun. 0.0298 0.0256 0.0275
18:01-19:00, Sat., 08 Jun. 0.0306 0.0263 0.0278
17:01-18:00, Sat., 08 Jun. 0.0297 0.0260 0.0278
16:01-17:00, Sat., 08 Jun. 0.0297 0.0253 0.0277
15:01-16:00, Sat., 08 Jun. 0.0305 0.0257 0.0280
14:01-15:00, Sat., 08 Jun. 0.0302 0.0251 0.0278
13:01-14:00, Sat., 08 Jun. 0.0304 0.0252 0.0276
12:01-13:00, Sat., 08 Jun. 0.0295 0.0259 0.0276
11:01-12:00, Sat., 08 Jun. 0.0294 0.0259 0.0277
10:01-11:00, Sat., 08 Jun. 0.0301 0.0260 0.0279
09:01-10:00, Sat., 08 Jun. 0.0304 0.0262 0.0277
08:01-09:00, Sat., 08 Jun. 0.0304 0.0264 0.0280
07:01-08:00, Sat., 08 Jun. 0.0306 0.0262 0.0281
06:01-07:00, Sat., 08 Jun. 0.0309 0.0269 0.0287
05:01-06:00, Sat., 08 Jun. 0.0316 0.0269 0.0294
04:01-05:00, Sat., 08 Jun. 0.0315 0.0267 0.0286
03:01-04:00, Sat., 08 Jun. 0.0311 0.0270 0.0288
02:01-03:00, Sat., 08 Jun. 0.0299 0.0261 0.0282
01:01-02:00, Sat., 08 Jun. 0.0301 0.0256 0.0278
00:01-01:00, Sat., 08 Jun. 0.0296 0.0256 0.0275
23:01-24:00, Fri., 07 Jun. 0.0297 0.0253 0.0277
22:01-23:00, Fri., 07 Jun. 0.0291 0.0256 0.0277
21:01-22:00, Fri., 07 Jun. 0.0294 0.0251 0.0273
20:01-21:00, Fri., 07 Jun. 0.0297 0.0256 0.0274
19:01-20:00, Fri., 07 Jun. 0.0297 0.0252 0.0274
18:01-19:00, Fri., 07 Jun. 0.0300 0.0251 0.0275
17:01-18:00, Fri., 07 Jun. 0.0298 0.0259 0.0276
16:01-17:00, Fri., 07 Jun. 0.0295 0.0254 0.0275
15:01-16:00, Fri., 07 Jun. 0.0296 0.0261 0.0277
14:01-15:00, Fri., 07 Jun. 0.0295 0.0255 0.0276
13:01-14:00, Fri., 07 Jun. 0.0296 0.0259 0.0278
12:01-13:00, Fri., 07 Jun. 0.0294 0.0249 0.0275
11:01-12:00, Fri., 07 Jun. 0.0294 0.0260 0.0274
10:01-11:00, Fri., 07 Jun. 0.0298 0.0258 0.0276
09:01-10:00, Fri., 07 Jun. 0.0297 0.0251 0.0277
08:01-09:00, Fri., 07 Jun. 0.0300 0.0260 0.0278
07:01-08:00, Fri., 07 Jun. 0.0308 0.0257 0.0276
06:01-07:00, Fri., 07 Jun. 0.0299 0.0261 0.0276
05:01-06:00, Fri., 07 Jun. 0.0299 0.0256 0.0275
04:01-05:00, Fri., 07 Jun. 0.0299 0.0255 0.0275
03:01-04:00, Fri., 07 Jun. 0.0294 0.0252 0.0274
02:01-03:00, Fri., 07 Jun. 0.0294 0.0259 0.0274
01:01-02:00, Fri., 07 Jun. 0.0295 0.0253 0.0273
00:01-01:00, Fri., 07 Jun. 0.0291 0.0250 0.0273
23:01-24:00, Thu., 06 Jun. 0.0297 0.0251 0.0271
22:01-23:00, Thu., 06 Jun. 0.0301 0.0256 0.0274
21:01-22:00, Thu., 06 Jun. 0.0297 0.0250 0.0273
20:01-21:00, Thu., 06 Jun. 0.0300 0.0256 0.0277
19:01-20:00, Thu., 06 Jun. 0.0291 0.0252 0.0272
18:01-19:00, Thu., 06 Jun. 0.0292 0.0253 0.0272
17:01-18:00, Thu., 06 Jun. 0.0287 0.0248 0.0272
16:01-17:00, Thu., 06 Jun. 0.0297 0.0249 0.0277
15:01-16:00, Thu., 06 Jun. 0.0299 0.0250 0.0272
14:01-15:00, Thu., 06 Jun. 0.0314 0.0256 0.0279
13:01-14:00, Thu., 06 Jun. 0.0294 0.0258 0.0274
12:01-13:00, Thu., 06 Jun. 0.0302 0.0262 0.0279
11:01-12:00, Thu., 06 Jun. 0.0297 0.0256 0.0278
10:01-11:00, Thu., 06 Jun. 0.0304 0.0250 0.0278
09:01-10:00, Thu., 06 Jun. 0.0297 0.0254 0.0278
08:01-09:00, Thu., 06 Jun. 0.0306 0.0261 0.0280
07:01-08:00, Thu., 06 Jun. 0.0300 0.0249 0.0281
06:01-07:00, Thu., 06 Jun. 0.0301 0.0262 0.0278
05:01-06:00, Thu., 06 Jun. 0.0297 0.0254 0.0278
04:01-05:00, Thu., 06 Jun. 0.0293 0.0249 0.0277
03:01-04:00, Thu., 06 Jun. 0.0294 0.0256 0.0274
02:01-03:00, Thu., 06 Jun. 0.0291 0.0256 0.0273
01:01-02:00, Thu., 06 Jun. 0.0301 0.0249 0.0273
00:01-01:00, Thu., 06 Jun. 0.0304 0.0253 0.0275
23:01-24:00, Wed., 05 Jun. 0.0292 0.0256 0.0273
22:01-23:00, Wed., 05 Jun. 0.0297 0.0250 0.0274
21:01-22:00, Wed., 05 Jun. 0.0295 0.0256 0.0275
20:01-21:00, Wed., 05 Jun. 0.0289 0.0257 0.0272
19:01-20:00, Wed., 05 Jun. 0.0294 0.0256 0.0275
18:01-19:00, Wed., 05 Jun. 0.0298 0.0246 0.0275
17:01-18:00, Wed., 05 Jun. 0.0292 0.0252 0.0275
16:01-17:00, Wed., 05 Jun. 0.0297 0.0256 0.0274
15:01-16:00, Wed., 05 Jun. 0.0297 0.0257 0.0277
14:01-15:00, Wed., 05 Jun. 0.0298 0.0252 0.0275
13:01-14:00, Wed., 05 Jun. 0.0300 0.0259 0.0276
12:01-13:00, Wed., 05 Jun. 0.0297 0.0255 0.0274
11:01-12:00, Wed., 05 Jun. 0.0296 0.0260 0.0277
10:01-11:00, Wed., 05 Jun. 0.0304 0.0208 0.0272
09:01-10:00, Wed., 05 Jun. 0.0297 0.0249 0.0275
08:01-09:00, Wed., 05 Jun. 0.0295 0.0256 0.0275
07:01-08:00, Wed., 05 Jun. 0.0296 0.0262 0.0275
06:01-07:00, Wed., 05 Jun. 0.0294 0.0256 0.0272
05:01-06:00, Wed., 05 Jun. 0.0294 0.0252 0.0274
04:01-05:00, Wed., 05 Jun. 0.0294 0.0255 0.0273
03:01-04:00, Wed., 05 Jun. 0.0289 0.0249 0.0272
02:01-03:00, Wed., 05 Jun. 0.0297 0.0249 0.0271
01:01-02:00, Wed., 05 Jun. 0.0294 0.0248 0.0269
00:01-01:00, Wed., 05 Jun. 0.0295 0.0252 0.0270
23:01-24:00, Tue., 04 Jun. 0.0288 0.0251 0.0270
22:01-23:00, Tue., 04 Jun. 0.0300 0.0256 0.0273
21:01-22:00, Tue., 04 Jun. 0.0311 0.0259 0.0283
20:01-21:00, Tue., 04 Jun. 0.0342 0.0276 0.0310
19:01-20:00, Tue., 04 Jun. 0.0336 0.0253 0.0284
18:01-19:00, Tue., 04 Jun. 0.0297 0.0249 0.0267
17:01-18:00, Tue., 04 Jun. 0.0291 0.0248 0.0269
16:01-17:00, Tue., 04 Jun. 0.0291 0.0254 0.0272
15:01-16:00, Tue., 04 Jun. 0.0307 0.0245 0.0272
14:01-15:00, Tue., 04 Jun. 0.0293 0.0249 0.0272
13:01-14:00, Tue., 04 Jun. 0.0293 0.0245 0.0275
12:01-13:00, Tue., 04 Jun. 0.0292 0.0255 0.0272
11:01-12:00, Tue., 04 Jun. 0.0295 0.0252 0.0272
10:01-11:00, Tue., 04 Jun. 0.0292 0.0252 0.0271
09:01-10:00, Tue., 04 Jun. 0.0287 0.0247 0.0271
08:01-09:00, Tue., 04 Jun. 0.0294 0.0253 0.0272
07:01-08:00, Tue., 04 Jun. 0.0288 0.0256 0.0271
06:01-07:00, Tue., 04 Jun. 0.0296 0.0253 0.0272
05:01-06:00, Tue., 04 Jun. 0.0290 0.0243 0.0274
04:01-05:00, Tue., 04 Jun. 0.0289 0.0249 0.0273
03:01-04:00, Tue., 04 Jun. 0.0291 0.0254 0.0271
02:01-03:00, Tue., 04 Jun. 0.0290 0.0244 0.0269
01:01-02:00, Tue., 04 Jun. 0.0292 0.0252 0.0272
00:01-01:00, Tue., 04 Jun. 0.0308 0.0256 0.0281
23:01-24:00, Mon., 03 Jun. 0.0360 0.0280 0.0311
22:01-23:00, Mon., 03 Jun. 0.0492 0.0339 0.0400
21:01-22:00, Mon., 03 Jun. 0.0517 0.0447 0.0488
20:01-21:00, Mon., 03 Jun. 0.0482 0.0279 0.0364
19:01-20:00, Mon., 03 Jun. 0.0312 0.0262 0.0290
18:01-19:00, Mon., 03 Jun. 0.0351 0.0280 0.0317
17:01-18:00, Mon., 03 Jun. 0.0471 0.0333 0.0394
16:01-17:00, Mon., 03 Jun. 0.0492 0.0313 0.0401
15:01-16:00, Mon., 03 Jun. 0.0310 0.0256 0.0275
14:01-15:00, Mon., 03 Jun. 0.0298 0.0252 0.0274
13:01-14:00, Mon., 03 Jun. 0.0294 0.0258 0.0273
12:01-13:00, Mon., 03 Jun. 0.0288 0.0259 0.0274
11:01-12:00, Mon., 03 Jun. 0.0296 0.0257 0.0277
10:01-11:00, Mon., 03 Jun. 0.0298 0.0256 0.0279
09:01-10:00, Mon., 03 Jun. 0.0297 0.0253 0.0275
08:01-09:00, Mon., 03 Jun. 0.0297 0.0259 0.0277