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., 17 Jul. 0.0281 0.0245 0.0262
06:01-07:00, Thu., 17 Jul. 0.0285 0.0243 0.0262
05:01-06:00, Thu., 17 Jul. 0.0275 0.0238 0.0262
04:01-05:00, Thu., 17 Jul. 0.0293 0.0238 0.0263
03:01-04:00, Thu., 17 Jul. 0.0286 0.0242 0.0265
02:01-03:00, Thu., 17 Jul. 0.0288 0.0237 0.0262
01:01-02:00, Thu., 17 Jul. 0.0283 0.0239 0.0260
00:01-01:00, Thu., 17 Jul. 0.0287 0.0235 0.0262
23:01-24:00, Wed., 16 Jul. 0.0290 0.0248 0.0263
22:01-23:00, Wed., 16 Jul. 0.0283 0.0242 0.0262
21:01-22:00, Wed., 16 Jul. 0.0284 0.0246 0.0261
20:01-21:00, Wed., 16 Jul. 0.0282 0.0240 0.0261
19:01-20:00, Wed., 16 Jul. 0.0280 0.0244 0.0263
18:01-19:00, Wed., 16 Jul. 0.0286 0.0246 0.0264
17:01-18:00, Wed., 16 Jul. 0.0290 0.0238 0.0264
16:01-17:00, Wed., 16 Jul. 0.0282 0.0244 0.0266
15:01-16:00, Wed., 16 Jul. 0.0286 0.0237 0.0264
14:01-15:00, Wed., 16 Jul. 0.0288 0.0245 0.0265
13:01-14:00, Wed., 16 Jul. 0.0313 0.0261 0.0283
12:01-13:00, Wed., 16 Jul. 0.0311 0.0258 0.0288
11:01-12:00, Wed., 16 Jul. 0.0292 0.0250 0.0265
10:01-11:00, Wed., 16 Jul. 0.0303 0.0248 0.0271
09:01-10:00, Wed., 16 Jul. 0.0318 0.0262 0.0293
08:01-09:00, Wed., 16 Jul. 0.0336 0.0252 0.0300
07:01-08:00, Wed., 16 Jul. 0.0283 0.0252 0.0268
06:01-07:00, Wed., 16 Jul. 0.0287 0.0239 0.0269
05:01-06:00, Wed., 16 Jul. 0.0285 0.0249 0.0268
04:01-05:00, Wed., 16 Jul. 0.0290 0.0247 0.0270
03:01-04:00, Wed., 16 Jul. 0.0294 0.0249 0.0269
02:01-03:00, Wed., 16 Jul. 0.0292 0.0252 0.0269
01:01-02:00, Wed., 16 Jul. 0.0288 0.0247 0.0269
00:01-01:00, Wed., 16 Jul. 0.0283 0.0247 0.0267
23:01-24:00, Tue., 15 Jul. 0.0290 0.0252 0.0267
22:01-23:00, Tue., 15 Jul. 0.0285 0.0247 0.0267
21:01-22:00, Tue., 15 Jul. 0.0287 0.0249 0.0265
20:01-21:00, Tue., 15 Jul. 0.0287 0.0244 0.0265
19:01-20:00, Tue., 15 Jul. 0.0285 0.0249 0.0265
18:01-19:00, Tue., 15 Jul. 0.0287 0.0250 0.0268
17:01-18:00, Tue., 15 Jul. 0.0308 0.0256 0.0282
16:01-17:00, Tue., 15 Jul. 0.0309 0.0249 0.0276
15:01-16:00, Tue., 15 Jul. 0.0294 0.0235 0.0274
14:01-15:00, Tue., 15 Jul. 0.0294 0.0245 0.0275
13:01-14:00, Tue., 15 Jul. 0.0291 0.0257 0.0271
12:01-13:00, Tue., 15 Jul. 0.0293 0.0250 0.0272
11:01-12:00, Tue., 15 Jul. 0.0307 0.0253 0.0271
10:01-11:00, Tue., 15 Jul. 0.0291 0.0245 0.0269
09:01-10:00, Tue., 15 Jul. 0.0298 0.0252 0.0272
08:01-09:00, Tue., 15 Jul. 0.0288 0.0249 0.0269
07:01-08:00, Tue., 15 Jul. 0.0290 0.0248 0.0269
06:01-07:00, Tue., 15 Jul. 0.0290 0.0245 0.0270
05:01-06:00, Tue., 15 Jul. 0.0290 0.0238 0.0271
04:01-05:00, Tue., 15 Jul. 0.0290 0.0253 0.0270
03:01-04:00, Tue., 15 Jul. 0.0292 0.0249 0.0269
02:01-03:00, Tue., 15 Jul. 0.0289 0.0252 0.0271
01:01-02:00, Tue., 15 Jul. 0.0294 0.0249 0.0269
00:01-01:00, Tue., 15 Jul. 0.0290 0.0249 0.0270
23:01-24:00, Mon., 14 Jul. 0.0286 0.0246 0.0269
22:01-23:00, Mon., 14 Jul. 0.0286 0.0249 0.0270
21:01-22:00, Mon., 14 Jul. 0.0294 0.0249 0.0270
20:01-21:00, Mon., 14 Jul. 0.0297 0.0248 0.0271
19:01-20:00, Mon., 14 Jul. 0.0299 0.0245 0.0268
18:01-19:00, Mon., 14 Jul. 0.0287 0.0250 0.0271
17:01-18:00, Mon., 14 Jul. 0.0290 0.0250 0.0269
16:01-17:00, Mon., 14 Jul. 0.0294 0.0252 0.0271
15:01-16:00, Mon., 14 Jul. 0.0291 0.0254 0.0272
14:01-15:00, Mon., 14 Jul. 0.0298 0.0252 0.0270
13:01-14:00, Mon., 14 Jul. 0.0290 0.0251 0.0272
12:01-13:00, Mon., 14 Jul. 0.0298 0.0248 0.0273
11:01-12:00, Mon., 14 Jul. 0.0294 0.0256 0.0273
10:01-11:00, Mon., 14 Jul. 0.0293 0.0260 0.0276
09:01-10:00, Mon., 14 Jul. 0.0297 0.0249 0.0269
08:01-09:00, Mon., 14 Jul. 0.0301 0.0248 0.0273
07:01-08:00, Mon., 14 Jul. 0.0291 0.0256 0.0273
06:01-07:00, Mon., 14 Jul. 0.0286 0.0249 0.0269
05:01-06:00, Mon., 14 Jul. 0.0297 0.0249 0.0272
04:01-05:00, Mon., 14 Jul. 0.0311 0.0266 0.0283
03:01-04:00, Mon., 14 Jul. 0.0304 0.0270 0.0286
02:01-03:00, Mon., 14 Jul. 0.0312 0.0273 0.0293
01:01-02:00, Mon., 14 Jul. 0.0322 0.0276 0.0298
00:01-01:00, Mon., 14 Jul. 0.0294 0.0249 0.0276
23:01-24:00, Sun., 13 Jul. 0.0298 0.0252 0.0273
22:01-23:00, Sun., 13 Jul. 0.0295 0.0245 0.0270
21:01-22:00, Sun., 13 Jul. 0.0294 0.0247 0.0272
20:01-21:00, Sun., 13 Jul. 0.0293 0.0249 0.0271
19:01-20:00, Sun., 13 Jul. 0.0291 0.0250 0.0274
18:01-19:00, Sun., 13 Jul. 0.0298 0.0252 0.0276
17:01-18:00, Sun., 13 Jul. 0.0295 0.0253 0.0271
16:01-17:00, Sun., 13 Jul. 0.0297 0.0258 0.0275
15:01-16:00, Sun., 13 Jul. 0.0295 0.0245 0.0273
14:01-15:00, Sun., 13 Jul. 0.0305 0.0253 0.0277
13:01-14:00, Sun., 13 Jul. 0.0294 0.0256 0.0274
12:01-13:00, Sun., 13 Jul. 0.0297 0.0251 0.0274
11:01-12:00, Sun., 13 Jul. 0.0293 0.0254 0.0273
10:01-11:00, Sun., 13 Jul. 0.0291 0.0256 0.0273
09:01-10:00, Sun., 13 Jul. 0.0297 0.0254 0.0275
08:01-09:00, Sun., 13 Jul. 0.0294 0.0249 0.0273
07:01-08:00, Sun., 13 Jul. 0.0298 0.0259 0.0275
06:01-07:00, Sun., 13 Jul. 0.0293 0.0251 0.0274
05:01-06:00, Sun., 13 Jul. 0.0296 0.0250 0.0270
04:01-05:00, Sun., 13 Jul. 0.0308 0.0255 0.0273
03:01-04:00, Sun., 13 Jul. 0.0289 0.0249 0.0272
02:01-03:00, Sun., 13 Jul. 0.0292 0.0258 0.0274
01:01-02:00, Sun., 13 Jul. 0.0296 0.0254 0.0274
00:01-01:00, Sun., 13 Jul. 0.0291 0.0251 0.0272
23:01-24:00, Sat., 12 Jul. 0.0293 0.0251 0.0273
22:01-23:00, Sat., 12 Jul. 0.0290 0.0253 0.0273
21:01-22:00, Sat., 12 Jul. 0.0287 0.0248 0.0270
20:01-21:00, Sat., 12 Jul. 0.0301 0.0242 0.0272
19:01-20:00, Sat., 12 Jul. 0.0290 0.0249 0.0271
18:01-19:00, Sat., 12 Jul. 0.0295 0.0248 0.0271
17:01-18:00, Sat., 12 Jul. 0.0299 0.0245 0.0272
16:01-17:00, Sat., 12 Jul. 0.0298 0.0256 0.0271
15:01-16:00, Sat., 12 Jul. 0.0290 0.0251 0.0273
14:01-15:00, Sat., 12 Jul. 0.0291 0.0253 0.0273
13:01-14:00, Sat., 12 Jul. 0.0298 0.0255 0.0274
12:01-13:00, Sat., 12 Jul. 0.0291 0.0246 0.0272
11:01-12:00, Sat., 12 Jul. 0.0296 0.0248 0.0273
10:01-11:00, Sat., 12 Jul. 0.0290 0.0250 0.0271
09:01-10:00, Sat., 12 Jul. 0.0294 0.0248 0.0272
08:01-09:00, Sat., 12 Jul. 0.0299 0.0249 0.0275
07:01-08:00, Sat., 12 Jul. 0.0291 0.0259 0.0272
06:01-07:00, Sat., 12 Jul. 0.0294 0.0253 0.0270
05:01-06:00, Sat., 12 Jul. 0.0294 0.0249 0.0271
04:01-05:00, Sat., 12 Jul. 0.0290 0.0253 0.0272
03:01-04:00, Sat., 12 Jul. 0.0290 0.0251 0.0273
02:01-03:00, Sat., 12 Jul. 0.0295 0.0244 0.0272
01:01-02:00, Sat., 12 Jul. 0.0287 0.0250 0.0272
00:01-01:00, Sat., 12 Jul. 0.0289 0.0249 0.0270
23:01-24:00, Fri., 11 Jul. 0.0285 0.0239 0.0268
22:01-23:00, Fri., 11 Jul. 0.0289 0.0241 0.0268
21:01-22:00, Fri., 11 Jul. 0.0292 0.0251 0.0268
20:01-21:00, Fri., 11 Jul. 0.0288 0.0249 0.0268
19:01-20:00, Fri., 11 Jul. 0.0288 0.0251 0.0269
18:01-19:00, Fri., 11 Jul. 0.0295 0.0249 0.0271
17:01-18:00, Fri., 11 Jul. 0.0294 0.0253 0.0273
16:01-17:00, Fri., 11 Jul. 0.0291 0.0254 0.0270
15:01-16:00, Fri., 11 Jul. 0.0295 0.0246 0.0272
14:01-15:00, Fri., 11 Jul. 0.0294 0.0252 0.0271
13:01-14:00, Fri., 11 Jul. 0.0301 0.0248 0.0269
12:01-13:00, Fri., 11 Jul. 0.0292 0.0253 0.0273
11:01-12:00, Fri., 11 Jul. 0.0294 0.0259 0.0278
10:01-11:00, Fri., 11 Jul. 0.0297 0.0260 0.0281
09:01-10:00, Fri., 11 Jul. 0.0314 0.0266 0.0287
08:01-09:00, Fri., 11 Jul. 0.0302 0.0262 0.0283
07:01-08:00, Fri., 11 Jul. 0.0299 0.0259 0.0282
06:01-07:00, Fri., 11 Jul. 0.0304 0.0257 0.0276
05:01-06:00, Fri., 11 Jul. 0.0290 0.0254 0.0272
04:01-05:00, Fri., 11 Jul. 0.0288 0.0252 0.0270
03:01-04:00, Fri., 11 Jul. 0.0292 0.0243 0.0271
02:01-03:00, Fri., 11 Jul. 0.0290 0.0246 0.0270
01:01-02:00, Fri., 11 Jul. 0.0293 0.0254 0.0273
00:01-01:00, Fri., 11 Jul. 0.0293 0.0252 0.0271
23:01-24:00, Thu., 10 Jul. 0.0295 0.0247 0.0274
22:01-23:00, Thu., 10 Jul. 0.0315 0.0263 0.0288
21:01-22:00, Thu., 10 Jul. 0.0368 0.0288 0.0324
20:01-21:00, Thu., 10 Jul. 0.0388 0.0329 0.0355
19:01-20:00, Thu., 10 Jul. 0.0363 0.0294 0.0331
18:01-19:00, Thu., 10 Jul. 0.0333 0.0282 0.0309
17:01-18:00, Thu., 10 Jul. 0.0304 0.0256 0.0278
16:01-17:00, Thu., 10 Jul. 0.0294 0.0262 0.0278
15:01-16:00, Thu., 10 Jul. 0.0299 0.0260 0.0279
14:01-15:00, Thu., 10 Jul. 0.0298 0.0259 0.0276
13:01-14:00, Thu., 10 Jul. 0.0298 0.0253 0.0277
12:01-13:00, Thu., 10 Jul. 0.0295 0.0250 0.0277
11:01-12:00, Thu., 10 Jul. 0.0301 0.0259 0.0277
10:01-11:00, Thu., 10 Jul. 0.0301 0.0256 0.0279
09:01-10:00, Thu., 10 Jul. 0.0300 0.0256 0.0281
08:01-09:00, Thu., 10 Jul. 0.0298 0.0248 0.0279
07:01-08:00, Thu., 10 Jul. 0.0304 0.0248 0.0279
06:01-07:00, Thu., 10 Jul. 0.0297 0.0264 0.0281
05:01-06:00, Thu., 10 Jul. 0.0304 0.0261 0.0279
04:01-05:00, Thu., 10 Jul. 0.0301 0.0260 0.0278
03:01-04:00, Thu., 10 Jul. 0.0295 0.0259 0.0278
02:01-03:00, Thu., 10 Jul. 0.0304 0.0261 0.0277
01:01-02:00, Thu., 10 Jul. 0.0299 0.0258 0.0276
00:01-01:00, Thu., 10 Jul. 0.0296 0.0252 0.0278
23:01-24:00, Wed., 09 Jul. 0.0297 0.0260 0.0276
22:01-23:00, Wed., 09 Jul. 0.0297 0.0254 0.0277
21:01-22:00, Wed., 09 Jul. 0.0311 0.0261 0.0278
20:01-21:00, Wed., 09 Jul. 0.0296 0.0252 0.0280
19:01-20:00, Wed., 09 Jul. 0.0303 0.0255 0.0277
18:01-19:00, Wed., 09 Jul. 0.0305 0.0263 0.0278
17:01-18:00, Wed., 09 Jul. 0.0300 0.0256 0.0278
16:01-17:00, Wed., 09 Jul. 0.0301 0.0260 0.0280
15:01-16:00, Wed., 09 Jul. 0.0300 0.0256 0.0278
14:01-15:00, Wed., 09 Jul. 0.0301 0.0261 0.0281
13:01-14:00, Wed., 09 Jul. 0.0300 0.0265 0.0279
12:01-13:00, Wed., 09 Jul. 0.0300 0.0256 0.0281
11:01-12:00, Wed., 09 Jul. 0.0301 0.0255 0.0278
10:01-11:00, Wed., 09 Jul. 0.0297 0.0254 0.0280
09:01-10:00, Wed., 09 Jul. 0.0302 0.0261 0.0281
08:01-09:00, Wed., 09 Jul. 0.0302 0.0261 0.0283
07:01-08:00, Wed., 09 Jul. 0.0296 0.0260 0.0277
06:01-07:00, Wed., 09 Jul. 0.0303 0.0261 0.0279
05:01-06:00, Wed., 09 Jul. 0.0298 0.0259 0.0279
04:01-05:00, Wed., 09 Jul. 0.0302 0.0249 0.0277
03:01-04:00, Wed., 09 Jul. 0.0296 0.0259 0.0276
02:01-03:00, Wed., 09 Jul. 0.0297 0.0245 0.0276
01:01-02:00, Wed., 09 Jul. 0.0304 0.0252 0.0278
00:01-01:00, Wed., 09 Jul. 0.0299 0.0259 0.0279
23:01-24:00, Tue., 08 Jul. 0.0303 0.0262 0.0280
22:01-23:00, Tue., 08 Jul. 0.0298 0.0266 0.0282
21:01-22:00, Tue., 08 Jul. 0.0299 0.0256 0.0280
20:01-21:00, Tue., 08 Jul. 0.0298 0.0262 0.0280
19:01-20:00, Tue., 08 Jul. 0.0304 0.0258 0.0281
18:01-19:00, Tue., 08 Jul. 0.0304 0.0262 0.0279
17:01-18:00, Tue., 08 Jul. 0.0312 0.0262 0.0280
16:01-17:00, Tue., 08 Jul. 0.0298 0.0262 0.0280
15:01-16:00, Tue., 08 Jul. 0.0300 0.0259 0.0282
14:01-15:00, Tue., 08 Jul. 0.0309 0.0260 0.0280
13:01-14:00, Tue., 08 Jul. 0.0301 0.0259 0.0282
12:01-13:00, Tue., 08 Jul. 0.0304 0.0259 0.0282
11:01-12:00, Tue., 08 Jul. 0.0310 0.0255 0.0280
10:01-11:00, Tue., 08 Jul. 0.0302 0.0259 0.0281
09:01-10:00, Tue., 08 Jul. 0.0311 0.0259 0.0279
08:01-09:00, Tue., 08 Jul. 0.0300 0.0256 0.0278
07:01-08:00, Tue., 08 Jul. 0.0294 0.0256 0.0275
06:01-07:00, Tue., 08 Jul. 0.0297 0.0249 0.0276
05:01-06:00, Tue., 08 Jul. 0.0296 0.0253 0.0277
04:01-05:00, Tue., 08 Jul. 0.0299 0.0254 0.0277
03:01-04:00, Tue., 08 Jul. 0.0298 0.0249 0.0275
02:01-03:00, Tue., 08 Jul. 0.0304 0.0258 0.0277
01:01-02:00, Tue., 08 Jul. 0.0294 0.0257 0.0277
00:01-01:00, Tue., 08 Jul. 0.0298 0.0259 0.0278
23:01-24:00, Mon., 07 Jul. 0.0303 0.0259 0.0281
22:01-23:00, Mon., 07 Jul. 0.0298 0.0258 0.0279
21:01-22:00, Mon., 07 Jul. 0.0297 0.0253 0.0279
20:01-21:00, Mon., 07 Jul. 0.0304 0.0263 0.0280
19:01-20:00, Mon., 07 Jul. 0.0303 0.0261 0.0280
18:01-19:00, Mon., 07 Jul. 0.0303 0.0259 0.0277
17:01-18:00, Mon., 07 Jul. 0.0299 0.0259 0.0281
16:01-17:00, Mon., 07 Jul. 0.0308 0.0261 0.0282
15:01-16:00, Mon., 07 Jul. 0.0301 0.0260 0.0281
14:01-15:00, Mon., 07 Jul. 0.0302 0.0262 0.0282
13:01-14:00, Mon., 07 Jul. 0.0314 0.0259 0.0281
12:01-13:00, Mon., 07 Jul. 0.0306 0.0263 0.0282
11:01-12:00, Mon., 07 Jul. 0.0308 0.0259 0.0281
10:01-11:00, Mon., 07 Jul. 0.0294 0.0252 0.0279
09:01-10:00, Mon., 07 Jul. 0.0297 0.0259 0.0281
08:01-09:00, Mon., 07 Jul. 0.0309 0.0259 0.0282