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
01:01-02:00, Tue., 20 May. 0.0293 0.0246 0.0266
00:01-01:00, Tue., 20 May. 0.0287 0.0250 0.0266
23:01-24:00, Mon., 19 May. 0.0287 0.0250 0.0267
22:01-23:00, Mon., 19 May. 0.0281 0.0246 0.0267
21:01-22:00, Mon., 19 May. 0.0280 0.0252 0.0265
20:01-21:00, Mon., 19 May. 0.0286 0.0246 0.0263
19:01-20:00, Mon., 19 May. 0.0283 0.0246 0.0265
18:01-19:00, Mon., 19 May. 0.0278 0.0248 0.0264
17:01-18:00, Mon., 19 May. 0.0290 0.0244 0.0267
16:01-17:00, Mon., 19 May. 0.0284 0.0243 0.0264
15:01-16:00, Mon., 19 May. 0.0286 0.0249 0.0267
14:01-15:00, Mon., 19 May. 0.0288 0.0238 0.0262
13:01-14:00, Mon., 19 May. 0.0291 0.0248 0.0268
12:01-13:00, Mon., 19 May. 0.0293 0.0244 0.0265
11:01-12:00, Mon., 19 May. 0.0283 0.0242 0.0268
10:01-11:00, Mon., 19 May. 0.0287 0.0240 0.0266
09:01-10:00, Mon., 19 May. 0.0292 0.0247 0.0265
08:01-09:00, Mon., 19 May. 0.0290 0.0249 0.0265
07:01-08:00, Mon., 19 May. 0.0284 0.0242 0.0264
06:01-07:00, Mon., 19 May. 0.0290 0.0249 0.0269
05:01-06:00, Mon., 19 May. 0.0292 0.0246 0.0269
04:01-05:00, Mon., 19 May. 0.0290 0.0246 0.0267
03:01-04:00, Mon., 19 May. 0.0289 0.0249 0.0269
02:01-03:00, Mon., 19 May. 0.0287 0.0249 0.0271
01:01-02:00, Mon., 19 May. 0.0302 0.0249 0.0269
00:01-01:00, Mon., 19 May. 0.0294 0.0242 0.0269
23:01-24:00, Sun., 18 May. 0.0290 0.0249 0.0270
22:01-23:00, Sun., 18 May. 0.0292 0.0245 0.0269
21:01-22:00, Sun., 18 May. 0.0285 0.0249 0.0267
20:01-21:00, Sun., 18 May. 0.0298 0.0244 0.0267
19:01-20:00, Sun., 18 May. 0.0290 0.0251 0.0268
18:01-19:00, Sun., 18 May. 0.0282 0.0245 0.0266
17:01-18:00, Sun., 18 May. 0.0286 0.0248 0.0267
16:01-17:00, Sun., 18 May. 0.0294 0.0249 0.0266
15:01-16:00, Sun., 18 May. 0.0291 0.0244 0.0265
14:01-15:00, Sun., 18 May. 0.0286 0.0245 0.0265
13:01-14:00, Sun., 18 May. 0.0288 0.0246 0.0267
12:01-13:00, Sun., 18 May. 0.0285 0.0249 0.0266
11:01-12:00, Sun., 18 May. 0.0285 0.0245 0.0266
10:01-11:00, Sun., 18 May. 0.0290 0.0252 0.0271
09:01-10:00, Sun., 18 May. 0.0291 0.0248 0.0271
08:01-09:00, Sun., 18 May. 0.0294 0.0252 0.0271
07:01-08:00, Sun., 18 May. 0.0291 0.0245 0.0271
06:01-07:00, Sun., 18 May. 0.0311 0.0252 0.0269
05:01-06:00, Sun., 18 May. 0.0280 0.0238 0.0258
04:01-05:00, Sun., 18 May. 0.0278 0.0240 0.0259
03:01-04:00, Sun., 18 May. 0.0280 0.0242 0.0260
02:01-03:00, Sun., 18 May. 0.0287 0.0249 0.0261
01:01-02:00, Sun., 18 May. 0.0276 0.0236 0.0261
00:01-01:00, Sun., 18 May. 0.0280 0.0244 0.0259
23:01-24:00, Sat., 17 May. 0.0287 0.0238 0.0260
22:01-23:00, Sat., 17 May. 0.0281 0.0244 0.0260
21:01-22:00, Sat., 17 May. 0.0286 0.0242 0.0261
20:01-21:00, Sat., 17 May. 0.0289 0.0241 0.0261
19:01-20:00, Sat., 17 May. 0.0280 0.0243 0.0262
18:01-19:00, Sat., 17 May. 0.0289 0.0238 0.0258
17:01-18:00, Sat., 17 May. 0.0280 0.0237 0.0259
16:01-17:00, Sat., 17 May. 0.0287 0.0246 0.0264
15:01-16:00, Sat., 17 May. 0.0315 0.0256 0.0283
14:01-15:00, Sat., 17 May. 0.0346 0.0294 0.0318
13:01-14:00, Sat., 17 May. 0.0352 0.0302 0.0327
12:01-13:00, Sat., 17 May. 0.0326 0.0276 0.0305
11:01-12:00, Sat., 17 May. 0.0300 0.0248 0.0276
10:01-11:00, Sat., 17 May. 0.0301 0.0261 0.0278
09:01-10:00, Sat., 17 May. 0.0311 0.0257 0.0286
08:01-09:00, Sat., 17 May. 0.0307 0.0258 0.0280
07:01-08:00, Sat., 17 May. 0.0313 0.0266 0.0285
06:01-07:00, Sat., 17 May. 0.0332 0.0274 0.0302
05:01-06:00, Sat., 17 May. 0.0365 0.0313 0.0335
04:01-05:00, Sat., 17 May. 0.0351 0.0302 0.0327
03:01-04:00, Sat., 17 May. 0.0335 0.0272 0.0308
02:01-03:00, Sat., 17 May. 0.0296 0.0249 0.0269
01:01-02:00, Sat., 17 May. 0.0287 0.0256 0.0268
00:01-01:00, Sat., 17 May. 0.0292 0.0250 0.0267
23:01-24:00, Fri., 16 May. 0.0294 0.0244 0.0264
22:01-23:00, Fri., 16 May. 0.0285 0.0242 0.0265
21:01-22:00, Fri., 16 May. 0.0286 0.0250 0.0263
20:01-21:00, Fri., 16 May. 0.0282 0.0245 0.0262
19:01-20:00, Fri., 16 May. 0.0288 0.0248 0.0266
18:01-19:00, Fri., 16 May. 0.0288 0.0245 0.0266
17:01-18:00, Fri., 16 May. 0.0283 0.0245 0.0266
16:01-17:00, Fri., 16 May. 0.0287 0.0251 0.0266
15:01-16:00, Fri., 16 May. 0.0280 0.0246 0.0264
14:01-15:00, Fri., 16 May. 0.0287 0.0239 0.0265
13:01-14:00, Fri., 16 May. 0.0283 0.0252 0.0266
12:01-13:00, Fri., 16 May. 0.0294 0.0245 0.0268
11:01-12:00, Fri., 16 May. 0.0284 0.0245 0.0265
10:01-11:00, Fri., 16 May. 0.0292 0.0244 0.0267
09:01-10:00, Fri., 16 May. 0.0293 0.0241 0.0270
08:01-09:00, Fri., 16 May. 0.0293 0.0253 0.0273
07:01-08:00, Fri., 16 May. 0.0285 0.0249 0.0269
06:01-07:00, Fri., 16 May. 0.0298 0.0257 0.0278
05:01-06:00, Fri., 16 May. 0.0297 0.0260 0.0279
04:01-05:00, Fri., 16 May. 0.0303 0.0263 0.0280
03:01-04:00, Fri., 16 May. 0.0306 0.0256 0.0281
02:01-03:00, Fri., 16 May. 0.0289 0.0249 0.0268
01:01-02:00, Fri., 16 May. 0.0290 0.0247 0.0267
00:01-01:00, Fri., 16 May. 0.0286 0.0249 0.0266
23:01-24:00, Thu., 15 May. 0.0280 0.0242 0.0265
22:01-23:00, Thu., 15 May. 0.0283 0.0245 0.0265
21:01-22:00, Thu., 15 May. 0.0282 0.0237 0.0264
20:01-21:00, Thu., 15 May. 0.0289 0.0246 0.0265
19:01-20:00, Thu., 15 May. 0.0280 0.0235 0.0261
18:01-19:00, Thu., 15 May. 0.0282 0.0248 0.0264
17:01-18:00, Thu., 15 May. 0.0290 0.0249 0.0264
16:01-17:00, Thu., 15 May. 0.0288 0.0245 0.0266
15:01-16:00, Thu., 15 May. 0.0285 0.0240 0.0265
14:01-15:00, Thu., 15 May. 0.0286 0.0245 0.0263
13:01-14:00, Thu., 15 May. 0.0286 0.0248 0.0263
12:01-13:00, Thu., 15 May. 0.0282 0.0243 0.0264
11:01-12:00, Thu., 15 May. 0.0288 0.0246 0.0262
10:01-11:00, Thu., 15 May. 0.0284 0.0243 0.0267
09:01-10:00, Thu., 15 May. 0.0290 0.0245 0.0269
08:01-09:00, Thu., 15 May. 0.0290 0.0252 0.0272
07:01-08:00, Thu., 15 May. 0.0303 0.0256 0.0281
06:01-07:00, Thu., 15 May. 0.0304 0.0258 0.0283
05:01-06:00, Thu., 15 May. 0.0301 0.0261 0.0280
04:01-05:00, Thu., 15 May. 0.0298 0.0248 0.0279
03:01-04:00, Thu., 15 May. 0.0290 0.0253 0.0268
02:01-03:00, Thu., 15 May. 0.0287 0.0247 0.0265
01:01-02:00, Thu., 15 May. 0.0282 0.0245 0.0264
00:01-01:00, Thu., 15 May. 0.0285 0.0246 0.0264
23:01-24:00, Wed., 14 May. 0.0277 0.0244 0.0262
22:01-23:00, Wed., 14 May. 0.0290 0.0243 0.0267
21:01-22:00, Wed., 14 May. 0.0284 0.0251 0.0266
20:01-21:00, Wed., 14 May. 0.0277 0.0242 0.0262
19:01-20:00, Wed., 14 May. 0.0279 0.0247 0.0265
18:01-19:00, Wed., 14 May. 0.0294 0.0238 0.0264
17:01-18:00, Wed., 14 May. 0.0287 0.0239 0.0265
16:01-17:00, Wed., 14 May. 0.0283 0.0243 0.0264
15:01-16:00, Wed., 14 May. 0.0280 0.0244 0.0263
14:01-15:00, Wed., 14 May. 0.0292 0.0249 0.0265
13:01-14:00, Wed., 14 May. 0.0290 0.0247 0.0265
12:01-13:00, Wed., 14 May. 0.0283 0.0245 0.0267
11:01-12:00, Wed., 14 May. 0.0294 0.0248 0.0269
10:01-11:00, Wed., 14 May. 0.0287 0.0252 0.0271
09:01-10:00, Wed., 14 May. 0.0301 0.0259 0.0275
08:01-09:00, Wed., 14 May. 0.0297 0.0253 0.0274
07:01-08:00, Wed., 14 May. 0.0293 0.0252 0.0273
06:01-07:00, Wed., 14 May. 0.0292 0.0257 0.0275
05:01-06:00, Wed., 14 May. 0.0303 0.0261 0.0281
04:01-05:00, Wed., 14 May. 0.0302 0.0263 0.0283
03:01-04:00, Wed., 14 May. 0.0297 0.0258 0.0278
02:01-03:00, Wed., 14 May. 0.0285 0.0249 0.0265
01:01-02:00, Wed., 14 May. 0.0286 0.0246 0.0265
00:01-01:00, Wed., 14 May. 0.0282 0.0251 0.0265
23:01-24:00, Tue., 13 May. 0.0280 0.0241 0.0263
22:01-23:00, Tue., 13 May. 0.0282 0.0245 0.0264
21:01-22:00, Tue., 13 May. 0.0280 0.0245 0.0264
20:01-21:00, Tue., 13 May. 0.0286 0.0245 0.0265
19:01-20:00, Tue., 13 May. 0.0283 0.0242 0.0263
18:01-19:00, Tue., 13 May. 0.0290 0.0247 0.0264
17:01-18:00, Tue., 13 May. 0.0287 0.0238 0.0265
16:01-17:00, Tue., 13 May. 0.0283 0.0242 0.0265
15:01-16:00, Tue., 13 May. 0.0286 0.0241 0.0265
14:01-15:00, Tue., 13 May. 0.0285 0.0242 0.0266
13:01-14:00, Tue., 13 May. 0.0283 0.0246 0.0266
12:01-13:00, Tue., 13 May. 0.0285 0.0241 0.0264
11:01-12:00, Tue., 13 May. 0.0285 0.0249 0.0265
10:01-11:00, Tue., 13 May. 0.0283 0.0248 0.0266
09:01-10:00, Tue., 13 May. 0.0283 0.0239 0.0262
08:01-09:00, Tue., 13 May. 0.0293 0.0249 0.0266
07:01-08:00, Tue., 13 May. 0.0287 0.0249 0.0269
06:01-07:00, Tue., 13 May. 0.0292 0.0246 0.0267
05:01-06:00, Tue., 13 May. 0.0288 0.0248 0.0268
04:01-05:00, Tue., 13 May. 0.0295 0.0244 0.0269
03:01-04:00, Tue., 13 May. 0.0282 0.0249 0.0265
02:01-03:00, Tue., 13 May. 0.0285 0.0245 0.0265
01:01-02:00, Tue., 13 May. 0.0287 0.0247 0.0265
00:01-01:00, Tue., 13 May. 0.0281 0.0249 0.0264
23:01-24:00, Mon., 12 May. 0.0283 0.0249 0.0265
22:01-23:00, Mon., 12 May. 0.0287 0.0242 0.0265
21:01-22:00, Mon., 12 May. 0.0286 0.0250 0.0265
20:01-21:00, Mon., 12 May. 0.0282 0.0237 0.0262
19:01-20:00, Mon., 12 May. 0.0289 0.0246 0.0265
18:01-19:00, Mon., 12 May. 0.0281 0.0249 0.0263
17:01-18:00, Mon., 12 May. 0.0290 0.0245 0.0264
16:01-17:00, Mon., 12 May. 0.0276 0.0232 0.0259
15:01-16:00, Mon., 12 May. 0.0280 0.0242 0.0263
14:01-15:00, Mon., 12 May. 0.0283 0.0242 0.0263
13:01-14:00, Mon., 12 May. 0.0293 0.0249 0.0267
12:01-13:00, Mon., 12 May. 0.0287 0.0248 0.0265
11:01-12:00, Mon., 12 May. 0.0287 0.0244 0.0268
10:01-11:00, Mon., 12 May. 0.0295 0.0249 0.0267
09:01-10:00, Mon., 12 May. 0.0294 0.0245 0.0268
08:01-09:00, Mon., 12 May. 0.0294 0.0249 0.0268
07:01-08:00, Mon., 12 May. 0.0293 0.0248 0.0272
06:01-07:00, Mon., 12 May. 0.0315 0.0259 0.0285
05:01-06:00, Mon., 12 May. 0.0322 0.0287 0.0305
04:01-05:00, Mon., 12 May. 0.0332 0.0293 0.0314
03:01-04:00, Mon., 12 May. 0.0367 0.0307 0.0332
02:01-03:00, Mon., 12 May. 0.0355 0.0307 0.0338
01:01-02:00, Mon., 12 May. 0.0344 0.0268 0.0304
00:01-01:00, Mon., 12 May. 0.0322 0.0277 0.0298
23:01-24:00, Sun., 11 May. 0.0310 0.0266 0.0292
22:01-23:00, Sun., 11 May. 0.0319 0.0282 0.0301
21:01-22:00, Sun., 11 May. 0.0317 0.0264 0.0292
20:01-21:00, Sun., 11 May. 0.0295 0.0255 0.0270
19:01-20:00, Sun., 11 May. 0.0294 0.0247 0.0270
18:01-19:00, Sun., 11 May. 0.0290 0.0252 0.0270
17:01-18:00, Sun., 11 May. 0.0287 0.0251 0.0268
16:01-17:00, Sun., 11 May. 0.0286 0.0249 0.0268
15:01-16:00, Sun., 11 May. 0.0287 0.0241 0.0268
14:01-15:00, Sun., 11 May. 0.0289 0.0251 0.0270
13:01-14:00, Sun., 11 May. 0.0283 0.0245 0.0265
12:01-13:00, Sun., 11 May. 0.0287 0.0245 0.0269
11:01-12:00, Sun., 11 May. 0.0288 0.0239 0.0268
10:01-11:00, Sun., 11 May. 0.0296 0.0249 0.0270
09:01-10:00, Sun., 11 May. 0.0289 0.0242 0.0269
08:01-09:00, Sun., 11 May. 0.0290 0.0250 0.0270
07:01-08:00, Sun., 11 May. 0.0298 0.0249 0.0270
06:01-07:00, Sun., 11 May. 0.0287 0.0249 0.0269
05:01-06:00, Sun., 11 May. 0.0289 0.0246 0.0268
04:01-05:00, Sun., 11 May. 0.0295 0.0243 0.0266
03:01-04:00, Sun., 11 May. 0.0283 0.0250 0.0267
02:01-03:00, Sun., 11 May. 0.0283 0.0247 0.0267
01:01-02:00, Sun., 11 May. 0.0283 0.0251 0.0265
00:01-01:00, Sun., 11 May. 0.0290 0.0244 0.0264
23:01-24:00, Sat., 10 May. 0.0287 0.0245 0.0267
22:01-23:00, Sat., 10 May. 0.0287 0.0252 0.0269
21:01-22:00, Sat., 10 May. 0.0286 0.0247 0.0271
20:01-21:00, Sat., 10 May. 0.0283 0.0250 0.0268
19:01-20:00, Sat., 10 May. 0.0285 0.0252 0.0268
18:01-19:00, Sat., 10 May. 0.0296 0.0247 0.0265
17:01-18:00, Sat., 10 May. 0.0280 0.0243 0.0262
16:01-17:00, Sat., 10 May. 0.0283 0.0241 0.0264
15:01-16:00, Sat., 10 May. 0.0282 0.0236 0.0262
14:01-15:00, Sat., 10 May. 0.0285 0.0242 0.0261
13:01-14:00, Sat., 10 May. 0.0284 0.0242 0.0262
12:01-13:00, Sat., 10 May. 0.0286 0.0242 0.0265
11:01-12:00, Sat., 10 May. 0.0298 0.0252 0.0270
10:01-11:00, Sat., 10 May. 0.0307 0.0258 0.0284
09:01-10:00, Sat., 10 May. 0.0325 0.0278 0.0306
08:01-09:00, Sat., 10 May. 0.0337 0.0275 0.0308
07:01-08:00, Sat., 10 May. 0.0341 0.0276 0.0308
06:01-07:00, Sat., 10 May. 0.0354 0.0293 0.0319
05:01-06:00, Sat., 10 May. 0.0349 0.0298 0.0325
04:01-05:00, Sat., 10 May. 0.0335 0.0290 0.0310
03:01-04:00, Sat., 10 May. 0.0363 0.0307 0.0336
02:01-03:00, Sat., 10 May. 0.0374 0.0313 0.0339