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
09:01-10:00, Wed., 22 Jan. 0.0300 0.0254 0.0276
08:01-09:00, Wed., 22 Jan. 0.0297 0.0262 0.0283
07:01-08:00, Wed., 22 Jan. 0.0308 0.0265 0.0282
06:01-07:00, Wed., 22 Jan. 0.0298 0.0258 0.0279
05:01-06:00, Wed., 22 Jan. 0.0298 0.0257 0.0277
04:01-05:00, Wed., 22 Jan. 0.0299 0.0258 0.0277
03:01-04:00, Wed., 22 Jan. 0.0293 0.0258 0.0277
02:01-03:00, Wed., 22 Jan. 0.0298 0.0253 0.0273
01:01-02:00, Wed., 22 Jan. 0.0297 0.0256 0.0277
00:01-01:00, Wed., 22 Jan. 0.0297 0.0261 0.0275
23:01-24:00, Tue., 21 Jan. 0.0307 0.0259 0.0276
22:01-23:00, Tue., 21 Jan. 0.0300 0.0259 0.0277
21:01-22:00, Tue., 21 Jan. 0.0299 0.0252 0.0274
20:01-21:00, Tue., 21 Jan. 0.0293 0.0255 0.0275
19:01-20:00, Tue., 21 Jan. 0.0297 0.0253 0.0275
18:01-19:00, Tue., 21 Jan. 0.0295 0.0258 0.0275
17:01-18:00, Tue., 21 Jan. 0.0294 0.0249 0.0271
16:01-17:00, Tue., 21 Jan. 0.0295 0.0258 0.0275
15:01-16:00, Tue., 21 Jan. 0.0294 0.0255 0.0277
14:01-15:00, Tue., 21 Jan. 0.0296 0.0267 0.0281
13:01-14:00, Tue., 21 Jan. 0.0297 0.0255 0.0278
12:01-13:00, Tue., 21 Jan. 0.0303 0.0259 0.0278
11:01-12:00, Tue., 21 Jan. 0.0303 0.0259 0.0282
10:01-11:00, Tue., 21 Jan. 0.0299 0.0249 0.0282
09:01-10:00, Tue., 21 Jan. 0.0308 0.0257 0.0286
08:01-09:00, Tue., 21 Jan. 0.0315 0.0262 0.0289
07:01-08:00, Tue., 21 Jan. 0.0302 0.0264 0.0283
06:01-07:00, Tue., 21 Jan. 0.0300 0.0260 0.0278
05:01-06:00, Tue., 21 Jan. 0.0298 0.0256 0.0276
04:01-05:00, Tue., 21 Jan. 0.0298 0.0252 0.0274
03:01-04:00, Tue., 21 Jan. 0.0303 0.0256 0.0276
02:01-03:00, Tue., 21 Jan. 0.0294 0.0252 0.0275
01:01-02:00, Tue., 21 Jan. 0.0293 0.0257 0.0275
00:01-01:00, Tue., 21 Jan. 0.0297 0.0251 0.0274
23:01-24:00, Mon., 20 Jan. 0.0295 0.0256 0.0275
22:01-23:00, Mon., 20 Jan. 0.0304 0.0256 0.0275
21:01-22:00, Mon., 20 Jan. 0.0290 0.0249 0.0275
20:01-21:00, Mon., 20 Jan. 0.0307 0.0258 0.0286
19:01-20:00, Mon., 20 Jan. 0.0320 0.0263 0.0300
18:01-19:00, Mon., 20 Jan. 0.0310 0.0257 0.0279
17:01-18:00, Mon., 20 Jan. 0.0294 0.0259 0.0274
16:01-17:00, Mon., 20 Jan. 0.0290 0.0256 0.0273
15:01-16:00, Mon., 20 Jan. 0.0304 0.0258 0.0277
14:01-15:00, Mon., 20 Jan. 0.0301 0.0259 0.0279
13:01-14:00, Mon., 20 Jan. 0.0316 0.0249 0.0281
12:01-13:00, Mon., 20 Jan. 0.0304 0.0262 0.0282
11:01-12:00, Mon., 20 Jan. 0.0318 0.0271 0.0288
10:01-11:00, Mon., 20 Jan. 0.0319 0.0269 0.0290
09:01-10:00, Mon., 20 Jan. 0.0316 0.0261 0.0287
08:01-09:00, Mon., 20 Jan. 0.0314 0.0269 0.0289
07:01-08:00, Mon., 20 Jan. 0.0346 0.0284 0.0313
06:01-07:00, Mon., 20 Jan. 0.0339 0.0280 0.0316
05:01-06:00, Mon., 20 Jan. 0.0324 0.0289 0.0306
04:01-05:00, Mon., 20 Jan. 0.0316 0.0264 0.0289
03:01-04:00, Mon., 20 Jan. 0.0308 0.0265 0.0285
02:01-03:00, Mon., 20 Jan. 0.0304 0.0255 0.0279
01:01-02:00, Mon., 20 Jan. 0.0304 0.0261 0.0283
00:01-01:00, Mon., 20 Jan. 0.0304 0.0256 0.0280
23:01-24:00, Sun., 19 Jan. 0.0301 0.0261 0.0280
22:01-23:00, Sun., 19 Jan. 0.0293 0.0259 0.0280
21:01-22:00, Sun., 19 Jan. 0.0309 0.0256 0.0280
20:01-21:00, Sun., 19 Jan. 0.0307 0.0259 0.0281
19:01-20:00, Sun., 19 Jan. 0.0308 0.0268 0.0284
18:01-19:00, Sun., 19 Jan. 0.0308 0.0259 0.0284
17:01-18:00, Sun., 19 Jan. 0.0308 0.0263 0.0283
16:01-17:00, Sun., 19 Jan. 0.0303 0.0266 0.0284
15:01-16:00, Sun., 19 Jan. 0.0308 0.0253 0.0277
14:01-15:00, Sun., 19 Jan. 0.0295 0.0251 0.0276
13:01-14:00, Sun., 19 Jan. 0.0307 0.0263 0.0280
12:01-13:00, Sun., 19 Jan. 0.0308 0.0252 0.0280
11:01-12:00, Sun., 19 Jan. 0.0311 0.0263 0.0284
10:01-11:00, Sun., 19 Jan. 0.0311 0.0263 0.0288
09:01-10:00, Sun., 19 Jan. 0.0315 0.0273 0.0292
08:01-09:00, Sun., 19 Jan. 0.0328 0.0279 0.0295
07:01-08:00, Sun., 19 Jan. 0.0313 0.0270 0.0291
06:01-07:00, Sun., 19 Jan. 0.0309 0.0271 0.0290
05:01-06:00, Sun., 19 Jan. 0.0311 0.0270 0.0291
04:01-05:00, Sun., 19 Jan. 0.0313 0.0269 0.0289
03:01-04:00, Sun., 19 Jan. 0.0304 0.0267 0.0286
02:01-03:00, Sun., 19 Jan. 0.0308 0.0267 0.0289
01:01-02:00, Sun., 19 Jan. 0.0311 0.0273 0.0291
00:01-01:00, Sun., 19 Jan. 0.0318 0.0273 0.0288
23:01-24:00, Sat., 18 Jan. 0.0311 0.0271 0.0289
22:01-23:00, Sat., 18 Jan. 0.0303 0.0260 0.0283
21:01-22:00, Sat., 18 Jan. 0.0299 0.0259 0.0280
20:01-21:00, Sat., 18 Jan. 0.0306 0.0258 0.0277
19:01-20:00, Sat., 18 Jan. 0.0293 0.0252 0.0275
18:01-19:00, Sat., 18 Jan. 0.0292 0.0254 0.0271
17:01-18:00, Sat., 18 Jan. 0.0290 0.0255 0.0272
16:01-17:00, Sat., 18 Jan. 0.0298 0.0246 0.0273
15:01-16:00, Sat., 18 Jan. 0.0301 0.0256 0.0276
14:01-15:00, Sat., 18 Jan. 0.0300 0.0245 0.0275
13:01-14:00, Sat., 18 Jan. 0.0301 0.0257 0.0275
12:01-13:00, Sat., 18 Jan. 0.0298 0.0252 0.0273
11:01-12:00, Sat., 18 Jan. 0.0294 0.0259 0.0275
10:01-11:00, Sat., 18 Jan. 0.0294 0.0255 0.0274
09:01-10:00, Sat., 18 Jan. 0.0291 0.0252 0.0275
08:01-09:00, Sat., 18 Jan. 0.0298 0.0248 0.0277
07:01-08:00, Sat., 18 Jan. 0.0293 0.0258 0.0275
06:01-07:00, Sat., 18 Jan. 0.0304 0.0256 0.0276
05:01-06:00, Sat., 18 Jan. 0.0285 0.0252 0.0271
04:01-05:00, Sat., 18 Jan. 0.0288 0.0255 0.0273
03:01-04:00, Sat., 18 Jan. 0.0296 0.0251 0.0274
02:01-03:00, Sat., 18 Jan. 0.0293 0.0260 0.0275
01:01-02:00, Sat., 18 Jan. 0.0293 0.0255 0.0273
00:01-01:00, Sat., 18 Jan. 0.0298 0.0253 0.0275
23:01-24:00, Fri., 17 Jan. 0.0293 0.0249 0.0271
22:01-23:00, Fri., 17 Jan. 0.0294 0.0254 0.0274
21:01-22:00, Fri., 17 Jan. 0.0291 0.0252 0.0275
20:01-21:00, Fri., 17 Jan. 0.0297 0.0251 0.0272
19:01-20:00, Fri., 17 Jan. 0.0298 0.0249 0.0272
18:01-19:00, Fri., 17 Jan. 0.0286 0.0254 0.0269
17:01-18:00, Fri., 17 Jan. 0.0295 0.0249 0.0273
16:01-17:00, Fri., 17 Jan. 0.0287 0.0250 0.0272
15:01-16:00, Fri., 17 Jan. 0.0294 0.0251 0.0272
14:01-15:00, Fri., 17 Jan. 0.0301 0.0252 0.0272
13:01-14:00, Fri., 17 Jan. 0.0290 0.0255 0.0273
12:01-13:00, Fri., 17 Jan. 0.0294 0.0257 0.0275
11:01-12:00, Fri., 17 Jan. 0.0294 0.0249 0.0273
10:01-11:00, Fri., 17 Jan. 0.0295 0.0256 0.0277
09:01-10:00, Fri., 17 Jan. 0.0297 0.0261 0.0279
08:01-09:00, Fri., 17 Jan. 0.0307 0.0263 0.0280
07:01-08:00, Fri., 17 Jan. 0.0310 0.0259 0.0283
06:01-07:00, Fri., 17 Jan. 0.0298 0.0256 0.0282
05:01-06:00, Fri., 17 Jan. 0.0302 0.0263 0.0285
04:01-05:00, Fri., 17 Jan. 0.0325 0.0280 0.0301
03:01-04:00, Fri., 17 Jan. 0.0333 0.0294 0.0308
02:01-03:00, Fri., 17 Jan. 0.0328 0.0284 0.0304
01:01-02:00, Fri., 17 Jan. 0.0323 0.0274 0.0300
00:01-01:00, Fri., 17 Jan. 0.0315 0.0281 0.0297
23:01-24:00, Thu., 16 Jan. 0.0315 0.0273 0.0298
22:01-23:00, Thu., 16 Jan. 0.0315 0.0271 0.0292
21:01-22:00, Thu., 16 Jan. 0.0304 0.0264 0.0283
20:01-21:00, Thu., 16 Jan. 0.0305 0.0261 0.0278
19:01-20:00, Thu., 16 Jan. 0.0291 0.0256 0.0275
18:01-19:00, Thu., 16 Jan. 0.0294 0.0249 0.0275
17:01-18:00, Thu., 16 Jan. 0.0297 0.0249 0.0275
16:01-17:00, Thu., 16 Jan. 0.0298 0.0258 0.0277
15:01-16:00, Thu., 16 Jan. 0.0297 0.0258 0.0276
14:01-15:00, Thu., 16 Jan. 0.0291 0.0247 0.0274
13:01-14:00, Thu., 16 Jan. 0.0305 0.0256 0.0273
12:01-13:00, Thu., 16 Jan. 0.0299 0.0256 0.0275
11:01-12:00, Thu., 16 Jan. 0.0305 0.0253 0.0277
10:01-11:00, Thu., 16 Jan. 0.0299 0.0259 0.0280
09:01-10:00, Thu., 16 Jan. 0.0298 0.0263 0.0282
08:01-09:00, Thu., 16 Jan. 0.0297 0.0262 0.0284
07:01-08:00, Thu., 16 Jan. 0.0304 0.0251 0.0282
06:01-07:00, Thu., 16 Jan. 0.0314 0.0253 0.0282
05:01-06:00, Thu., 16 Jan. 0.0311 0.0268 0.0283
04:01-05:00, Thu., 16 Jan. 0.0308 0.0265 0.0285
03:01-04:00, Thu., 16 Jan. 0.0309 0.0264 0.0285
02:01-03:00, Thu., 16 Jan. 0.0298 0.0260 0.0281
01:01-02:00, Thu., 16 Jan. 0.0301 0.0265 0.0283
00:01-01:00, Thu., 16 Jan. 0.0309 0.0268 0.0284
23:01-24:00, Wed., 15 Jan. 0.0309 0.0264 0.0284
22:01-23:00, Wed., 15 Jan. 0.0304 0.0256 0.0283
21:01-22:00, Wed., 15 Jan. 0.0308 0.0262 0.0284
20:01-21:00, Wed., 15 Jan. 0.0303 0.0263 0.0283
19:01-20:00, Wed., 15 Jan. 0.0301 0.0258 0.0281
18:01-19:00, Wed., 15 Jan. 0.0313 0.0261 0.0283
17:01-18:00, Wed., 15 Jan. 0.0302 0.0259 0.0279
16:01-17:00, Wed., 15 Jan. 0.0303 0.0259 0.0279
15:01-16:00, Wed., 15 Jan. 0.0304 0.0263 0.0283
14:01-15:00, Wed., 15 Jan. 0.0315 0.0263 0.0284
13:01-14:00, Wed., 15 Jan. 0.0303 0.0258 0.0283
12:01-13:00, Wed., 15 Jan. 0.0298 0.0255 0.0277
11:01-12:00, Wed., 15 Jan. 0.0308 0.0263 0.0282
10:01-11:00, Wed., 15 Jan. 0.0312 0.0275 0.0290
09:01-10:00, Wed., 15 Jan. 0.0322 0.0270 0.0295
08:01-09:00, Wed., 15 Jan. 0.0318 0.0273 0.0299
07:01-08:00, Wed., 15 Jan. 0.0319 0.0281 0.0296
06:01-07:00, Wed., 15 Jan. 0.0318 0.0273 0.0297
05:01-06:00, Wed., 15 Jan. 0.0315 0.0275 0.0295
04:01-05:00, Wed., 15 Jan. 0.0316 0.0278 0.0295
03:01-04:00, Wed., 15 Jan. 0.0313 0.0263 0.0291
02:01-03:00, Wed., 15 Jan. 0.0315 0.0273 0.0292
01:01-02:00, Wed., 15 Jan. 0.0313 0.0268 0.0289
00:01-01:00, Wed., 15 Jan. 0.0309 0.0264 0.0287
23:01-24:00, Tue., 14 Jan. 0.0320 0.0266 0.0289
22:01-23:00, Tue., 14 Jan. 0.0308 0.0265 0.0290
21:01-22:00, Tue., 14 Jan. 0.0308 0.0262 0.0285
20:01-21:00, Tue., 14 Jan. 0.0298 0.0252 0.0279
19:01-20:00, Tue., 14 Jan. 0.0302 0.0252 0.0278
18:01-19:00, Tue., 14 Jan. 0.0297 0.0249 0.0274
17:01-18:00, Tue., 14 Jan. 0.0286 0.0249 0.0270
16:01-17:00, Tue., 14 Jan. 0.0289 0.0259 0.0275
15:01-16:00, Tue., 14 Jan. 0.0301 0.0253 0.0274
14:01-15:00, Tue., 14 Jan. 0.0292 0.0258 0.0277
13:01-14:00, Tue., 14 Jan. 0.0309 0.0256 0.0280
12:01-13:00, Tue., 14 Jan. 0.0298 0.0259 0.0278
11:01-12:00, Tue., 14 Jan. 0.0306 0.0264 0.0282
10:01-11:00, Tue., 14 Jan. 0.0310 0.0262 0.0284
09:01-10:00, Tue., 14 Jan. 0.0308 0.0260 0.0289
08:01-09:00, Tue., 14 Jan. 0.0315 0.0251 0.0285
07:01-08:00, Tue., 14 Jan. 0.0304 0.0261 0.0282
06:01-07:00, Tue., 14 Jan. 0.0299 0.0259 0.0280
05:01-06:00, Tue., 14 Jan. 0.0298 0.0263 0.0281
04:01-05:00, Tue., 14 Jan. 0.0306 0.0261 0.0281
03:01-04:00, Tue., 14 Jan. 0.0296 0.0261 0.0278
02:01-03:00, Tue., 14 Jan. 0.0298 0.0263 0.0276
01:01-02:00, Tue., 14 Jan. 0.0306 0.0249 0.0276
00:01-01:00, Tue., 14 Jan. 0.0304 0.0248 0.0270
23:01-24:00, Mon., 13 Jan. 0.0291 0.0246 0.0270
22:01-23:00, Mon., 13 Jan. 0.0297 0.0252 0.0268
21:01-22:00, Mon., 13 Jan. 0.0282 0.0249 0.0267
20:01-21:00, Mon., 13 Jan. 0.0290 0.0249 0.0268
19:01-20:00, Mon., 13 Jan. 0.0283 0.0245 0.0267
18:01-19:00, Mon., 13 Jan. 0.0283 0.0249 0.0267
17:01-18:00, Mon., 13 Jan. 0.0284 0.0245 0.0265
16:01-17:00, Mon., 13 Jan. 0.0297 0.0244 0.0267
15:01-16:00, Mon., 13 Jan. 0.0286 0.0251 0.0270
14:01-15:00, Mon., 13 Jan. 0.0297 0.0253 0.0271
13:01-14:00, Mon., 13 Jan. 0.0283 0.0257 0.0272
12:01-13:00, Mon., 13 Jan. 0.0308 0.0252 0.0275
11:01-12:00, Mon., 13 Jan. 0.0301 0.0261 0.0281
10:01-11:00, Mon., 13 Jan. 0.0304 0.0269 0.0288
09:01-10:00, Mon., 13 Jan. 0.0318 0.0274 0.0297
08:01-09:00, Mon., 13 Jan. 0.0323 0.0279 0.0304
07:01-08:00, Mon., 13 Jan. 0.0330 0.0284 0.0303
06:01-07:00, Mon., 13 Jan. 0.0322 0.0288 0.0305
05:01-06:00, Mon., 13 Jan. 0.0322 0.0285 0.0303
04:01-05:00, Mon., 13 Jan. 0.0332 0.0288 0.0307
03:01-04:00, Mon., 13 Jan. 0.0325 0.0276 0.0300
02:01-03:00, Mon., 13 Jan. 0.0313 0.0268 0.0290
01:01-02:00, Mon., 13 Jan. 0.0304 0.0262 0.0285
00:01-01:00, Mon., 13 Jan. 0.0301 0.0254 0.0279
23:01-24:00, Sun., 12 Jan. 0.0302 0.0259 0.0279
22:01-23:00, Sun., 12 Jan. 0.0301 0.0252 0.0279
21:01-22:00, Sun., 12 Jan. 0.0304 0.0258 0.0280
20:01-21:00, Sun., 12 Jan. 0.0304 0.0260 0.0281
19:01-20:00, Sun., 12 Jan. 0.0305 0.0259 0.0281
18:01-19:00, Sun., 12 Jan. 0.0299 0.0259 0.0279
17:01-18:00, Sun., 12 Jan. 0.0312 0.0257 0.0276
16:01-17:00, Sun., 12 Jan. 0.0292 0.0254 0.0275
15:01-16:00, Sun., 12 Jan. 0.0298 0.0252 0.0278
14:01-15:00, Sun., 12 Jan. 0.0297 0.0266 0.0279
13:01-14:00, Sun., 12 Jan. 0.0300 0.0264 0.0280
12:01-13:00, Sun., 12 Jan. 0.0299 0.0264 0.0280
11:01-12:00, Sun., 12 Jan. 0.0299 0.0258 0.0282
10:01-11:00, Sun., 12 Jan. 0.0301 0.0260 0.0283