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
22:01-23:00, Mon., 20 Apr. 0.0301 0.0251 0.0280
21:01-22:00, Mon., 20 Apr. 0.0302 0.0261 0.0278
20:01-21:00, Mon., 20 Apr. 0.0301 0.0262 0.0280
19:01-20:00, Mon., 20 Apr. 0.0297 0.0263 0.0281
18:01-19:00, Mon., 20 Apr. 0.0297 0.0253 0.0277
17:01-18:00, Mon., 20 Apr. 0.0309 0.0245 0.0279
16:01-17:00, Mon., 20 Apr. 0.0299 0.0257 0.0276
15:01-16:00, Mon., 20 Apr. 0.0298 0.0259 0.0280
14:01-15:00, Mon., 20 Apr. 0.0304 0.0262 0.0281
13:01-14:00, Mon., 20 Apr. 0.0298 0.0256 0.0278
12:01-13:00, Mon., 20 Apr. 0.0296 0.0256 0.0277
11:01-12:00, Mon., 20 Apr. 0.0298 0.0252 0.0278
10:01-11:00, Mon., 20 Apr. 0.0298 0.0256 0.0279
09:01-10:00, Mon., 20 Apr. 0.0310 0.0260 0.0282
08:01-09:00, Mon., 20 Apr. 0.0306 0.0263 0.0283
07:01-08:00, Mon., 20 Apr. 0.0309 0.0266 0.0286
06:01-07:00, Mon., 20 Apr. 0.0312 0.0256 0.0286
05:01-06:00, Mon., 20 Apr. 0.0309 0.0263 0.0283
04:01-05:00, Mon., 20 Apr. 0.0309 0.0257 0.0284
03:01-04:00, Mon., 20 Apr. 0.0307 0.0262 0.0284
02:01-03:00, Mon., 20 Apr. 0.0303 0.0263 0.0283
01:01-02:00, Mon., 20 Apr. 0.0303 0.0263 0.0282
00:01-01:00, Mon., 20 Apr. 0.0301 0.0266 0.0281
23:01-24:00, Sun., 19 Apr. 0.0302 0.0262 0.0280
22:01-23:00, Sun., 19 Apr. 0.0299 0.0262 0.0279
21:01-22:00, Sun., 19 Apr. 0.0301 0.0266 0.0281
20:01-21:00, Sun., 19 Apr. 0.0297 0.0252 0.0279
19:01-20:00, Sun., 19 Apr. 0.0294 0.0252 0.0278
18:01-19:00, Sun., 19 Apr. 0.0305 0.0258 0.0279
17:01-18:00, Sun., 19 Apr. 0.0297 0.0251 0.0277
16:01-17:00, Sun., 19 Apr. 0.0301 0.0255 0.0279
15:01-16:00, Sun., 19 Apr. 0.0299 0.0262 0.0280
14:01-15:00, Sun., 19 Apr. 0.0302 0.0262 0.0280
13:01-14:00, Sun., 19 Apr. 0.0303 0.0263 0.0283
12:01-13:00, Sun., 19 Apr. 0.0303 0.0263 0.0282
11:01-12:00, Sun., 19 Apr. 0.0304 0.0259 0.0282
10:01-11:00, Sun., 19 Apr. 0.0304 0.0265 0.0284
09:01-10:00, Sun., 19 Apr. 0.0320 0.0269 0.0289
08:01-09:00, Sun., 19 Apr. 0.0308 0.0276 0.0290
07:01-08:00, Sun., 19 Apr. 0.0321 0.0272 0.0293
06:01-07:00, Sun., 19 Apr. 0.0311 0.0256 0.0293
05:01-06:00, Sun., 19 Apr. 0.0310 0.0273 0.0289
04:01-05:00, Sun., 19 Apr. 0.0308 0.0269 0.0288
03:01-04:00, Sun., 19 Apr. 0.0300 0.0263 0.0284
02:01-03:00, Sun., 19 Apr. 0.0301 0.0262 0.0278
01:01-02:00, Sun., 19 Apr. 0.0300 0.0257 0.0277
00:01-01:00, Sun., 19 Apr. 0.0292 0.0252 0.0276
23:01-24:00, Sat., 18 Apr. 0.0297 0.0251 0.0276
22:01-23:00, Sat., 18 Apr. 0.0301 0.0252 0.0276
21:01-22:00, Sat., 18 Apr. 0.0304 0.0255 0.0275
20:01-21:00, Sat., 18 Apr. 0.0294 0.0250 0.0272
19:01-20:00, Sat., 18 Apr. 0.0294 0.0252 0.0273
18:01-19:00, Sat., 18 Apr. 0.0302 0.0245 0.0273
17:01-18:00, Sat., 18 Apr. 0.0301 0.0252 0.0273
16:01-17:00, Sat., 18 Apr. 0.0298 0.0256 0.0275
15:01-16:00, Sat., 18 Apr. 0.0294 0.0256 0.0274
14:01-15:00, Sat., 18 Apr. 0.0291 0.0256 0.0273
13:01-14:00, Sat., 18 Apr. 0.0302 0.0256 0.0277
12:01-13:00, Sat., 18 Apr. 0.0297 0.0252 0.0273
11:01-12:00, Sat., 18 Apr. 0.0297 0.0253 0.0276
10:01-11:00, Sat., 18 Apr. 0.0291 0.0249 0.0275
09:01-10:00, Sat., 18 Apr. 0.0295 0.0258 0.0275
08:01-09:00, Sat., 18 Apr. 0.0297 0.0251 0.0278
07:01-08:00, Sat., 18 Apr. 0.0301 0.0256 0.0277
06:01-07:00, Sat., 18 Apr. 0.0297 0.0262 0.0278
05:01-06:00, Sat., 18 Apr. 0.0302 0.0261 0.0277
04:01-05:00, Sat., 18 Apr. 0.0298 0.0254 0.0277
03:01-04:00, Sat., 18 Apr. 0.0299 0.0250 0.0277
02:01-03:00, Sat., 18 Apr. 0.0289 0.0252 0.0273
01:01-02:00, Sat., 18 Apr. 0.0297 0.0253 0.0273
00:01-01:00, Sat., 18 Apr. 0.0296 0.0256 0.0271
23:01-24:00, Fri., 17 Apr. 0.0290 0.0248 0.0271
22:01-23:00, Fri., 17 Apr. 0.0294 0.0248 0.0271
21:01-22:00, Fri., 17 Apr. 0.0288 0.0252 0.0272
20:01-21:00, Fri., 17 Apr. 0.0290 0.0245 0.0272
19:01-20:00, Fri., 17 Apr. 0.0299 0.0254 0.0271
18:01-19:00, Fri., 17 Apr. 0.0297 0.0245 0.0271
17:01-18:00, Fri., 17 Apr. 0.0290 0.0251 0.0270
16:01-17:00, Fri., 17 Apr. 0.0301 0.0256 0.0274
15:01-16:00, Fri., 17 Apr. 0.0294 0.0252 0.0272
14:01-15:00, Fri., 17 Apr. 0.0298 0.0251 0.0276
13:01-14:00, Fri., 17 Apr. 0.0297 0.0256 0.0276
12:01-13:00, Fri., 17 Apr. 0.0300 0.0260 0.0277
11:01-12:00, Fri., 17 Apr. 0.0297 0.0252 0.0275
10:01-11:00, Fri., 17 Apr. 0.0294 0.0257 0.0277
09:01-10:00, Fri., 17 Apr. 0.0297 0.0254 0.0276
08:01-09:00, Fri., 17 Apr. 0.0295 0.0260 0.0277
07:01-08:00, Fri., 17 Apr. 0.0293 0.0251 0.0274
06:01-07:00, Fri., 17 Apr. 0.0297 0.0252 0.0276
05:01-06:00, Fri., 17 Apr. 0.0295 0.0255 0.0274
04:01-05:00, Fri., 17 Apr. 0.0297 0.0253 0.0273
03:01-04:00, Fri., 17 Apr. 0.0287 0.0253 0.0273
02:01-03:00, Fri., 17 Apr. 0.0297 0.0252 0.0272
01:01-02:00, Fri., 17 Apr. 0.0295 0.0251 0.0274
00:01-01:00, Fri., 17 Apr. 0.0292 0.0254 0.0274
23:01-24:00, Thu., 16 Apr. 0.0287 0.0258 0.0272
22:01-23:00, Thu., 16 Apr. 0.0303 0.0250 0.0273
21:01-22:00, Thu., 16 Apr. 0.0290 0.0248 0.0272
20:01-21:00, Thu., 16 Apr. 0.0302 0.0251 0.0272
19:01-20:00, Thu., 16 Apr. 0.0293 0.0253 0.0273
18:01-19:00, Thu., 16 Apr. 0.0297 0.0256 0.0273
17:01-18:00, Thu., 16 Apr. 0.0294 0.0255 0.0274
16:01-17:00, Thu., 16 Apr. 0.0296 0.0249 0.0275
15:01-16:00, Thu., 16 Apr. 0.0303 0.0260 0.0278
14:01-15:00, Thu., 16 Apr. 0.0300 0.0258 0.0278
13:01-14:00, Thu., 16 Apr. 0.0298 0.0256 0.0278
12:01-13:00, Thu., 16 Apr. 0.0297 0.0258 0.0277
11:01-12:00, Thu., 16 Apr. 0.0297 0.0251 0.0273
10:01-11:00, Thu., 16 Apr. 0.0298 0.0250 0.0274
09:01-10:00, Thu., 16 Apr. 0.0297 0.0253 0.0274
08:01-09:00, Thu., 16 Apr. 0.0293 0.0256 0.0275
07:01-08:00, Thu., 16 Apr. 0.0302 0.0255 0.0275
06:01-07:00, Thu., 16 Apr. 0.0297 0.0266 0.0282
05:01-06:00, Thu., 16 Apr. 0.0300 0.0257 0.0277
04:01-05:00, Thu., 16 Apr. 0.0308 0.0261 0.0285
03:01-04:00, Thu., 16 Apr. 0.0337 0.0284 0.0304
02:01-03:00, Thu., 16 Apr. 0.0364 0.0291 0.0332
01:01-02:00, Thu., 16 Apr. 0.0377 0.0322 0.0347
00:01-01:00, Thu., 16 Apr. 0.0367 0.0313 0.0334
23:01-24:00, Wed., 15 Apr. 0.0377 0.0304 0.0344
22:01-23:00, Wed., 15 Apr. 0.0399 0.0345 0.0374
21:01-22:00, Wed., 15 Apr. 0.0419 0.0367 0.0390
20:01-21:00, Wed., 15 Apr. 0.0430 0.0378 0.0410
19:01-20:00, Wed., 15 Apr. 0.0415 0.0301 0.0359
18:01-19:00, Wed., 15 Apr. 0.0329 0.0273 0.0301
17:01-18:00, Wed., 15 Apr. 0.0301 0.0262 0.0280
16:01-17:00, Wed., 15 Apr. 0.0298 0.0248 0.0276
15:01-16:00, Wed., 15 Apr. 0.0305 0.0254 0.0278
14:01-15:00, Wed., 15 Apr. 0.0299 0.0256 0.0277
13:01-14:00, Wed., 15 Apr. 0.0301 0.0259 0.0279
12:01-13:00, Wed., 15 Apr. 0.0298 0.0260 0.0279
11:01-12:00, Wed., 15 Apr. 0.0314 0.0244 0.0277
10:01-11:00, Wed., 15 Apr. 0.0302 0.0263 0.0280
09:01-10:00, Wed., 15 Apr. 0.0302 0.0263 0.0281
08:01-09:00, Wed., 15 Apr. 0.0303 0.0263 0.0282
07:01-08:00, Wed., 15 Apr. 0.0318 0.0265 0.0283
06:01-07:00, Wed., 15 Apr. 0.0310 0.0263 0.0285
05:01-06:00, Wed., 15 Apr. 0.0304 0.0262 0.0281
04:01-05:00, Wed., 15 Apr. 0.0305 0.0261 0.0281
03:01-04:00, Wed., 15 Apr. 0.0298 0.0259 0.0279
02:01-03:00, Wed., 15 Apr. 0.0303 0.0258 0.0279
01:01-02:00, Wed., 15 Apr. 0.0298 0.0256 0.0280
00:01-01:00, Wed., 15 Apr. 0.0297 0.0263 0.0279
23:01-24:00, Tue., 14 Apr. 0.0299 0.0255 0.0275
22:01-23:00, Tue., 14 Apr. 0.0299 0.0256 0.0277
21:01-22:00, Tue., 14 Apr. 0.0309 0.0254 0.0278
20:01-21:00, Tue., 14 Apr. 0.0302 0.0252 0.0277
19:01-20:00, Tue., 14 Apr. 0.0301 0.0258 0.0277
18:01-19:00, Tue., 14 Apr. 0.0306 0.0251 0.0278
17:01-18:00, Tue., 14 Apr. 0.0293 0.0258 0.0276
16:01-17:00, Tue., 14 Apr. 0.0298 0.0254 0.0278
15:01-16:00, Tue., 14 Apr. 0.0300 0.0252 0.0277
14:01-15:00, Tue., 14 Apr. 0.0295 0.0257 0.0276
13:01-14:00, Tue., 14 Apr. 0.0297 0.0258 0.0277
12:01-13:00, Tue., 14 Apr. 0.0301 0.0252 0.0277
11:01-12:00, Tue., 14 Apr. 0.0304 0.0257 0.0280
10:01-11:00, Tue., 14 Apr. 0.0299 0.0264 0.0279
09:01-10:00, Tue., 14 Apr. 0.0311 0.0266 0.0290
08:01-09:00, Tue., 14 Apr. 0.0315 0.0271 0.0291
07:01-08:00, Tue., 14 Apr. 0.0310 0.0271 0.0288
06:01-07:00, Tue., 14 Apr. 0.0309 0.0275 0.0290
05:01-06:00, Tue., 14 Apr. 0.0314 0.0273 0.0291
04:01-05:00, Tue., 14 Apr. 0.0318 0.0273 0.0294
03:01-04:00, Tue., 14 Apr. 0.0311 0.0272 0.0297
02:01-03:00, Tue., 14 Apr. 0.0313 0.0263 0.0290
01:01-02:00, Tue., 14 Apr. 0.0295 0.0264 0.0280
00:01-01:00, Tue., 14 Apr. 0.0303 0.0249 0.0279
23:01-24:00, Mon., 13 Apr. 0.0299 0.0259 0.0279
22:01-23:00, Mon., 13 Apr. 0.0300 0.0252 0.0276
21:01-22:00, Mon., 13 Apr. 0.0300 0.0256 0.0278
20:01-21:00, Mon., 13 Apr. 0.0294 0.0256 0.0274
19:01-20:00, Mon., 13 Apr. 0.0298 0.0261 0.0277
18:01-19:00, Mon., 13 Apr. 0.0294 0.0259 0.0277
17:01-18:00, Mon., 13 Apr. 0.0295 0.0261 0.0277
16:01-17:00, Mon., 13 Apr. 0.0298 0.0256 0.0277
15:01-16:00, Mon., 13 Apr. 0.0298 0.0256 0.0277
14:01-15:00, Mon., 13 Apr. 0.0301 0.0252 0.0276
13:01-14:00, Mon., 13 Apr. 0.0292 0.0254 0.0277
12:01-13:00, Mon., 13 Apr. 0.0297 0.0249 0.0278
11:01-12:00, Mon., 13 Apr. 0.0301 0.0260 0.0279
10:01-11:00, Mon., 13 Apr. 0.0303 0.0268 0.0283
09:01-10:00, Mon., 13 Apr. 0.0307 0.0263 0.0286
08:01-09:00, Mon., 13 Apr. 0.0312 0.0269 0.0287
07:01-08:00, Mon., 13 Apr. 0.0306 0.0267 0.0288
06:01-07:00, Mon., 13 Apr. 0.0306 0.0275 0.0290
05:01-06:00, Mon., 13 Apr. 0.0310 0.0263 0.0289
04:01-05:00, Mon., 13 Apr. 0.0306 0.0263 0.0287
03:01-04:00, Mon., 13 Apr. 0.0308 0.0271 0.0289
02:01-03:00, Mon., 13 Apr. 0.0310 0.0263 0.0288
01:01-02:00, Mon., 13 Apr. 0.0311 0.0260 0.0280
00:01-01:00, Mon., 13 Apr. 0.0302 0.0259 0.0279
23:01-24:00, Sun., 12 Apr. 0.0300 0.0259 0.0278
22:01-23:00, Sun., 12 Apr. 0.0301 0.0259 0.0279
21:01-22:00, Sun., 12 Apr. 0.0299 0.0255 0.0279
20:01-21:00, Sun., 12 Apr. 0.0298 0.0259 0.0276
19:01-20:00, Sun., 12 Apr. 0.0294 0.0260 0.0275
18:01-19:00, Sun., 12 Apr. 0.0301 0.0260 0.0278
17:01-18:00, Sun., 12 Apr. 0.0300 0.0262 0.0279
16:01-17:00, Sun., 12 Apr. 0.0300 0.0267 0.0281
15:01-16:00, Sun., 12 Apr. 0.0298 0.0259 0.0279
14:01-15:00, Sun., 12 Apr. 0.0304 0.0259 0.0281
13:01-14:00, Sun., 12 Apr. 0.0298 0.0262 0.0280
12:01-13:00, Sun., 12 Apr. 0.0307 0.0256 0.0281
11:01-12:00, Sun., 12 Apr. 0.0304 0.0263 0.0279
10:01-11:00, Sun., 12 Apr. 0.0297 0.0262 0.0282
09:01-10:00, Sun., 12 Apr. 0.0303 0.0261 0.0280
08:01-09:00, Sun., 12 Apr. 0.0302 0.0255 0.0280
07:01-08:00, Sun., 12 Apr. 0.0304 0.0262 0.0281
06:01-07:00, Sun., 12 Apr. 0.0303 0.0249 0.0279
05:01-06:00, Sun., 12 Apr. 0.0303 0.0262 0.0281
04:01-05:00, Sun., 12 Apr. 0.0300 0.0262 0.0280
03:01-04:00, Sun., 12 Apr. 0.0292 0.0260 0.0277
02:01-03:00, Sun., 12 Apr. 0.0304 0.0258 0.0278
01:01-02:00, Sun., 12 Apr. 0.0298 0.0263 0.0279
00:01-01:00, Sun., 12 Apr. 0.0301 0.0263 0.0280
23:01-24:00, Sat., 11 Apr. 0.0295 0.0262 0.0280
22:01-23:00, Sat., 11 Apr. 0.0294 0.0259 0.0276
21:01-22:00, Sat., 11 Apr. 0.0303 0.0258 0.0280
20:01-21:00, Sat., 11 Apr. 0.0300 0.0259 0.0278
19:01-20:00, Sat., 11 Apr. 0.0304 0.0249 0.0279
18:01-19:00, Sat., 11 Apr. 0.0301 0.0257 0.0279
17:01-18:00, Sat., 11 Apr. 0.0306 0.0260 0.0283
16:01-17:00, Sat., 11 Apr. 0.0302 0.0260 0.0284
15:01-16:00, Sat., 11 Apr. 0.0309 0.0257 0.0284
14:01-15:00, Sat., 11 Apr. 0.0304 0.0264 0.0283
13:01-14:00, Sat., 11 Apr. 0.0304 0.0263 0.0282
12:01-13:00, Sat., 11 Apr. 0.0301 0.0263 0.0284
11:01-12:00, Sat., 11 Apr. 0.0306 0.0262 0.0282
10:01-11:00, Sat., 11 Apr. 0.0308 0.0261 0.0284
09:01-10:00, Sat., 11 Apr. 0.0311 0.0266 0.0288
08:01-09:00, Sat., 11 Apr. 0.0313 0.0266 0.0291
07:01-08:00, Sat., 11 Apr. 0.0322 0.0273 0.0290
06:01-07:00, Sat., 11 Apr. 0.0311 0.0270 0.0295
05:01-06:00, Sat., 11 Apr. 0.0313 0.0272 0.0290
04:01-05:00, Sat., 11 Apr. 0.0311 0.0266 0.0288
03:01-04:00, Sat., 11 Apr. 0.0305 0.0259 0.0285
02:01-03:00, Sat., 11 Apr. 0.0311 0.0265 0.0284
01:01-02:00, Sat., 11 Apr. 0.0299 0.0263 0.0282
00:01-01:00, Sat., 11 Apr. 0.0300 0.0258 0.0279
23:01-24:00, Fri., 10 Apr. 0.0305 0.0261 0.0278