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
13:01-14:00, Sat., 26 Apr. 0.0289 0.0245 0.0269
12:01-13:00, Sat., 26 Apr. 0.0292 0.0249 0.0271
11:01-12:00, Sat., 26 Apr. 0.0290 0.0241 0.0269
10:01-11:00, Sat., 26 Apr. 0.0291 0.0255 0.0273
09:01-10:00, Sat., 26 Apr. 0.0289 0.0245 0.0269
08:01-09:00, Sat., 26 Apr. 0.0292 0.0249 0.0271
07:01-08:00, Sat., 26 Apr. 0.0290 0.0249 0.0271
06:01-07:00, Sat., 26 Apr. 0.0285 0.0250 0.0268
05:01-06:00, Sat., 26 Apr. 0.0290 0.0246 0.0268
04:01-05:00, Sat., 26 Apr. 0.0289 0.0246 0.0267
03:01-04:00, Sat., 26 Apr. 0.0294 0.0245 0.0270
02:01-03:00, Sat., 26 Apr. 0.0292 0.0249 0.0271
01:01-02:00, Sat., 26 Apr. 0.0294 0.0253 0.0272
00:01-01:00, Sat., 26 Apr. 0.0288 0.0246 0.0269
23:01-24:00, Fri., 25 Apr. 0.0288 0.0252 0.0271
22:01-23:00, Fri., 25 Apr. 0.0286 0.0246 0.0270
21:01-22:00, Fri., 25 Apr. 0.0293 0.0255 0.0272
20:01-21:00, Fri., 25 Apr. 0.0286 0.0258 0.0273
19:01-20:00, Fri., 25 Apr. 0.0294 0.0251 0.0272
18:01-19:00, Fri., 25 Apr. 0.0297 0.0252 0.0270
17:01-18:00, Fri., 25 Apr. 0.0294 0.0251 0.0269
16:01-17:00, Fri., 25 Apr. 0.0298 0.0245 0.0269
15:01-16:00, Fri., 25 Apr. 0.0284 0.0249 0.0268
14:01-15:00, Fri., 25 Apr. 0.0296 0.0252 0.0272
13:01-14:00, Fri., 25 Apr. 0.0294 0.0245 0.0271
12:01-13:00, Fri., 25 Apr. 0.0294 0.0249 0.0271
11:01-12:00, Fri., 25 Apr. 0.0293 0.0252 0.0269
10:01-11:00, Fri., 25 Apr. 0.0293 0.0250 0.0271
09:01-10:00, Fri., 25 Apr. 0.0290 0.0254 0.0272
08:01-09:00, Fri., 25 Apr. 0.0302 0.0251 0.0272
07:01-08:00, Fri., 25 Apr. 0.0291 0.0249 0.0272
06:01-07:00, Fri., 25 Apr. 0.0290 0.0249 0.0272
05:01-06:00, Fri., 25 Apr. 0.0290 0.0242 0.0269
04:01-05:00, Fri., 25 Apr. 0.0294 0.0247 0.0268
03:01-04:00, Fri., 25 Apr. 0.0290 0.0250 0.0268
02:01-03:00, Fri., 25 Apr. 0.0287 0.0256 0.0269
01:01-02:00, Fri., 25 Apr. 0.0293 0.0249 0.0269
00:01-01:00, Fri., 25 Apr. 0.0296 0.0249 0.0269
23:01-24:00, Thu., 24 Apr. 0.0290 0.0253 0.0271
22:01-23:00, Thu., 24 Apr. 0.0283 0.0247 0.0269
21:01-22:00, Thu., 24 Apr. 0.0290 0.0249 0.0271
20:01-21:00, Thu., 24 Apr. 0.0289 0.0245 0.0269
19:01-20:00, Thu., 24 Apr. 0.0287 0.0250 0.0268
18:01-19:00, Thu., 24 Apr. 0.0294 0.0246 0.0268
17:01-18:00, Thu., 24 Apr. 0.0287 0.0249 0.0266
16:01-17:00, Thu., 24 Apr. 0.0282 0.0249 0.0266
15:01-16:00, Thu., 24 Apr. 0.0287 0.0247 0.0268
14:01-15:00, Thu., 24 Apr. 0.0290 0.0246 0.0267
13:01-14:00, Thu., 24 Apr. 0.0291 0.0245 0.0271
12:01-13:00, Thu., 24 Apr. 0.0289 0.0254 0.0270
11:01-12:00, Thu., 24 Apr. 0.0289 0.0248 0.0270
10:01-11:00, Thu., 24 Apr. 0.0286 0.0249 0.0270
09:01-10:00, Thu., 24 Apr. 0.0298 0.0246 0.0271
08:01-09:00, Thu., 24 Apr. 0.0294 0.0247 0.0270
07:01-08:00, Thu., 24 Apr. 0.0292 0.0250 0.0272
06:01-07:00, Thu., 24 Apr. 0.0295 0.0252 0.0275
05:01-06:00, Thu., 24 Apr. 0.0295 0.0261 0.0275
04:01-05:00, Thu., 24 Apr. 0.0290 0.0249 0.0272
03:01-04:00, Thu., 24 Apr. 0.0293 0.0250 0.0273
02:01-03:00, Thu., 24 Apr. 0.0294 0.0249 0.0271
01:01-02:00, Thu., 24 Apr. 0.0285 0.0249 0.0271
00:01-01:00, Thu., 24 Apr. 0.0292 0.0247 0.0269
23:01-24:00, Wed., 23 Apr. 0.0286 0.0251 0.0266
22:01-23:00, Wed., 23 Apr. 0.0293 0.0244 0.0267
21:01-22:00, Wed., 23 Apr. 0.0283 0.0243 0.0266
20:01-21:00, Wed., 23 Apr. 0.0284 0.0241 0.0263
19:01-20:00, Wed., 23 Apr. 0.0286 0.0245 0.0265
18:01-19:00, Wed., 23 Apr. 0.0286 0.0249 0.0266
17:01-18:00, Wed., 23 Apr. 0.0291 0.0253 0.0271
16:01-17:00, Wed., 23 Apr. 0.0324 0.0263 0.0295
15:01-16:00, Wed., 23 Apr. 0.0398 0.0304 0.0349
14:01-15:00, Wed., 23 Apr. 0.0405 0.0290 0.0358
13:01-14:00, Wed., 23 Apr. 0.0335 0.0295 0.0314
12:01-13:00, Wed., 23 Apr. 0.0349 0.0299 0.0325
11:01-12:00, Wed., 23 Apr. 0.0351 0.0303 0.0323
10:01-11:00, Wed., 23 Apr. 0.0339 0.0294 0.0316
09:01-10:00, Wed., 23 Apr. 0.0350 0.0302 0.0325
08:01-09:00, Wed., 23 Apr. 0.0359 0.0285 0.0312
07:01-08:00, Wed., 23 Apr. 0.0317 0.0273 0.0294
06:01-07:00, Wed., 23 Apr. 0.0318 0.0273 0.0293
05:01-06:00, Wed., 23 Apr. 0.0377 0.0290 0.0329
04:01-05:00, Wed., 23 Apr. 0.0405 0.0344 0.0374
03:01-04:00, Wed., 23 Apr. 0.0444 0.0369 0.0415
02:01-03:00, Wed., 23 Apr. 0.0424 0.0322 0.0377
01:01-02:00, Wed., 23 Apr. 0.0343 0.0264 0.0296
00:01-01:00, Wed., 23 Apr. 0.0291 0.0248 0.0273
23:01-24:00, Tue., 22 Apr. 0.0295 0.0257 0.0275
22:01-23:00, Tue., 22 Apr. 0.0294 0.0253 0.0273
21:01-22:00, Tue., 22 Apr. 0.0292 0.0258 0.0275
20:01-21:00, Tue., 22 Apr. 0.0295 0.0250 0.0273
19:01-20:00, Tue., 22 Apr. 0.0298 0.0252 0.0272
18:01-19:00, Tue., 22 Apr. 0.0293 0.0256 0.0274
17:01-18:00, Tue., 22 Apr. 0.0290 0.0250 0.0273
16:01-17:00, Tue., 22 Apr. 0.0294 0.0253 0.0274
15:01-16:00, Tue., 22 Apr. 0.0301 0.0252 0.0275
14:01-15:00, Tue., 22 Apr. 0.0302 0.0259 0.0275
13:01-14:00, Tue., 22 Apr. 0.0303 0.0253 0.0276
12:01-13:00, Tue., 22 Apr. 0.0291 0.0257 0.0274
11:01-12:00, Tue., 22 Apr. 0.0298 0.0251 0.0275
10:01-11:00, Tue., 22 Apr. 0.0294 0.0258 0.0274
09:01-10:00, Tue., 22 Apr. 0.0309 0.0259 0.0280
08:01-09:00, Tue., 22 Apr. 0.0304 0.0256 0.0279
07:01-08:00, Tue., 22 Apr. 0.0297 0.0263 0.0281
06:01-07:00, Tue., 22 Apr. 0.0314 0.0261 0.0283
05:01-06:00, Tue., 22 Apr. 0.0312 0.0261 0.0282
04:01-05:00, Tue., 22 Apr. 0.0301 0.0259 0.0282
03:01-04:00, Tue., 22 Apr. 0.0304 0.0259 0.0276
02:01-03:00, Tue., 22 Apr. 0.0292 0.0245 0.0274
01:01-02:00, Tue., 22 Apr. 0.0297 0.0254 0.0275
00:01-01:00, Tue., 22 Apr. 0.0292 0.0251 0.0272
23:01-24:00, Mon., 21 Apr. 0.0286 0.0256 0.0272
22:01-23:00, Mon., 21 Apr. 0.0304 0.0245 0.0276
21:01-22:00, Mon., 21 Apr. 0.0306 0.0258 0.0276
20:01-21:00, Mon., 21 Apr. 0.0292 0.0253 0.0275
19:01-20:00, Mon., 21 Apr. 0.0290 0.0259 0.0273
18:01-19:00, Mon., 21 Apr. 0.0294 0.0253 0.0274
17:01-18:00, Mon., 21 Apr. 0.0297 0.0254 0.0273
16:01-17:00, Mon., 21 Apr. 0.0293 0.0251 0.0274
15:01-16:00, Mon., 21 Apr. 0.0297 0.0252 0.0273
14:01-15:00, Mon., 21 Apr. 0.0301 0.0257 0.0275
13:01-14:00, Mon., 21 Apr. 0.0296 0.0252 0.0276
12:01-13:00, Mon., 21 Apr. 0.0290 0.0258 0.0275
11:01-12:00, Mon., 21 Apr. 0.0290 0.0256 0.0275
10:01-11:00, Mon., 21 Apr. 0.0304 0.0253 0.0277
09:01-10:00, Mon., 21 Apr. 0.0292 0.0251 0.0274
08:01-09:00, Mon., 21 Apr. 0.0292 0.0255 0.0276
07:01-08:00, Mon., 21 Apr. 0.0295 0.0258 0.0276
06:01-07:00, Mon., 21 Apr. 0.0299 0.0253 0.0276
05:01-06:00, Mon., 21 Apr. 0.0303 0.0261 0.0277
04:01-05:00, Mon., 21 Apr. 0.0302 0.0260 0.0278
03:01-04:00, Mon., 21 Apr. 0.0307 0.0259 0.0277
02:01-03:00, Mon., 21 Apr. 0.0301 0.0262 0.0277
01:01-02:00, Mon., 21 Apr. 0.0298 0.0253 0.0276
00:01-01:00, Mon., 21 Apr. 0.0299 0.0250 0.0277
23:01-24:00, Sun., 20 Apr. 0.0310 0.0255 0.0278
22:01-23:00, Sun., 20 Apr. 0.0294 0.0255 0.0275
21:01-22:00, Sun., 20 Apr. 0.0293 0.0252 0.0272
20:01-21:00, Sun., 20 Apr. 0.0287 0.0251 0.0272
19:01-20:00, Sun., 20 Apr. 0.0285 0.0253 0.0268
18:01-19:00, Sun., 20 Apr. 0.0299 0.0242 0.0271
17:01-18:00, Sun., 20 Apr. 0.0289 0.0259 0.0272
16:01-17:00, Sun., 20 Apr. 0.0290 0.0244 0.0269
15:01-16:00, Sun., 20 Apr. 0.0290 0.0242 0.0269
14:01-15:00, Sun., 20 Apr. 0.0291 0.0244 0.0270
13:01-14:00, Sun., 20 Apr. 0.0286 0.0254 0.0270
12:01-13:00, Sun., 20 Apr. 0.0292 0.0253 0.0270
11:01-12:00, Sun., 20 Apr. 0.0285 0.0249 0.0270
10:01-11:00, Sun., 20 Apr. 0.0287 0.0250 0.0271
09:01-10:00, Sun., 20 Apr. 0.0292 0.0252 0.0271
08:01-09:00, Sun., 20 Apr. 0.0290 0.0245 0.0272
07:01-08:00, Sun., 20 Apr. 0.0294 0.0255 0.0273
06:01-07:00, Sun., 20 Apr. 0.0291 0.0253 0.0272
05:01-06:00, Sun., 20 Apr. 0.0302 0.0257 0.0281
04:01-05:00, Sun., 20 Apr. 0.0306 0.0259 0.0282
03:01-04:00, Sun., 20 Apr. 0.0300 0.0256 0.0276
02:01-03:00, Sun., 20 Apr. 0.0298 0.0256 0.0275
01:01-02:00, Sun., 20 Apr. 0.0294 0.0257 0.0274
00:01-01:00, Sun., 20 Apr. 0.0297 0.0250 0.0273
23:01-24:00, Sat., 19 Apr. 0.0304 0.0247 0.0276
22:01-23:00, Sat., 19 Apr. 0.0295 0.0254 0.0276
21:01-22:00, Sat., 19 Apr. 0.0298 0.0257 0.0273
20:01-21:00, Sat., 19 Apr. 0.0293 0.0257 0.0274
19:01-20:00, Sat., 19 Apr. 0.0290 0.0256 0.0273
18:01-19:00, Sat., 19 Apr. 0.0290 0.0254 0.0270
17:01-18:00, Sat., 19 Apr. 0.0293 0.0249 0.0270
16:01-17:00, Sat., 19 Apr. 0.0297 0.0245 0.0273
15:01-16:00, Sat., 19 Apr. 0.0295 0.0241 0.0275
14:01-15:00, Sat., 19 Apr. 0.0294 0.0254 0.0274
13:01-14:00, Sat., 19 Apr. 0.0294 0.0251 0.0274
12:01-13:00, Sat., 19 Apr. 0.0293 0.0251 0.0273
11:01-12:00, Sat., 19 Apr. 0.0294 0.0259 0.0273
10:01-11:00, Sat., 19 Apr. 0.0311 0.0256 0.0279
09:01-10:00, Sat., 19 Apr. 0.0301 0.0262 0.0284
08:01-09:00, Sat., 19 Apr. 0.0322 0.0256 0.0289
07:01-08:00, Sat., 19 Apr. 0.0313 0.0280 0.0296
06:01-07:00, Sat., 19 Apr. 0.0311 0.0270 0.0294
05:01-06:00, Sat., 19 Apr. 0.0312 0.0259 0.0286
04:01-05:00, Sat., 19 Apr. 0.0308 0.0263 0.0281
03:01-04:00, Sat., 19 Apr. 0.0291 0.0254 0.0273
02:01-03:00, Sat., 19 Apr. 0.0298 0.0249 0.0274
01:01-02:00, Sat., 19 Apr. 0.0295 0.0252 0.0272
00:01-01:00, Sat., 19 Apr. 0.0295 0.0255 0.0273
23:01-24:00, Fri., 18 Apr. 0.0297 0.0256 0.0276
22:01-23:00, Fri., 18 Apr. 0.0295 0.0246 0.0270
21:01-22:00, Fri., 18 Apr. 0.0284 0.0250 0.0271
20:01-21:00, Fri., 18 Apr. 0.0296 0.0248 0.0269
19:01-20:00, Fri., 18 Apr. 0.0289 0.0248 0.0270
18:01-19:00, Fri., 18 Apr. 0.0290 0.0249 0.0269
17:01-18:00, Fri., 18 Apr. 0.0296 0.0245 0.0270
16:01-17:00, Fri., 18 Apr. 0.0290 0.0249 0.0269
15:01-16:00, Fri., 18 Apr. 0.0287 0.0244 0.0268
14:01-15:00, Fri., 18 Apr. 0.0288 0.0249 0.0269
13:01-14:00, Fri., 18 Apr. 0.0298 0.0255 0.0272
12:01-13:00, Fri., 18 Apr. 0.0294 0.0251 0.0270
11:01-12:00, Fri., 18 Apr. 0.0298 0.0255 0.0272
10:01-11:00, Fri., 18 Apr. 0.0303 0.0260 0.0276
09:01-10:00, Fri., 18 Apr. 0.0307 0.0255 0.0280
08:01-09:00, Fri., 18 Apr. 0.0310 0.0266 0.0288
07:01-08:00, Fri., 18 Apr. 0.0308 0.0268 0.0292
06:01-07:00, Fri., 18 Apr. 0.0310 0.0271 0.0291
05:01-06:00, Fri., 18 Apr. 0.0318 0.0270 0.0290
04:01-05:00, Fri., 18 Apr. 0.0308 0.0270 0.0290
03:01-04:00, Fri., 18 Apr. 0.0302 0.0263 0.0286
02:01-03:00, Fri., 18 Apr. 0.0309 0.0263 0.0287
01:01-02:00, Fri., 18 Apr. 0.0306 0.0262 0.0282
00:01-01:00, Fri., 18 Apr. 0.0291 0.0253 0.0274
23:01-24:00, Thu., 17 Apr. 0.0307 0.0249 0.0273
22:01-23:00, Thu., 17 Apr. 0.0296 0.0249 0.0274
21:01-22:00, Thu., 17 Apr. 0.0299 0.0255 0.0273
20:01-21:00, Thu., 17 Apr. 0.0293 0.0252 0.0271
19:01-20:00, Thu., 17 Apr. 0.0294 0.0254 0.0272
18:01-19:00, Thu., 17 Apr. 0.0293 0.0250 0.0273
17:01-18:00, Thu., 17 Apr. 0.0295 0.0255 0.0271
16:01-17:00, Thu., 17 Apr. 0.0302 0.0256 0.0277
15:01-16:00, Thu., 17 Apr. 0.0305 0.0259 0.0277
14:01-15:00, Thu., 17 Apr. 0.0300 0.0259 0.0278
13:01-14:00, Thu., 17 Apr. 0.0292 0.0245 0.0274
12:01-13:00, Thu., 17 Apr. 0.0294 0.0254 0.0275
11:01-12:00, Thu., 17 Apr. 0.0291 0.0260 0.0276
10:01-11:00, Thu., 17 Apr. 0.0292 0.0259 0.0274
09:01-10:00, Thu., 17 Apr. 0.0301 0.0249 0.0277
08:01-09:00, Thu., 17 Apr. 0.0302 0.0259 0.0278
07:01-08:00, Thu., 17 Apr. 0.0301 0.0256 0.0278
06:01-07:00, Thu., 17 Apr. 0.0298 0.0259 0.0279
05:01-06:00, Thu., 17 Apr. 0.0290 0.0254 0.0275
04:01-05:00, Thu., 17 Apr. 0.0300 0.0249 0.0275
03:01-04:00, Thu., 17 Apr. 0.0298 0.0249 0.0275
02:01-03:00, Thu., 17 Apr. 0.0303 0.0253 0.0275
01:01-02:00, Thu., 17 Apr. 0.0293 0.0252 0.0273
00:01-01:00, Thu., 17 Apr. 0.0286 0.0249 0.0268
23:01-24:00, Wed., 16 Apr. 0.0287 0.0237 0.0268
22:01-23:00, Wed., 16 Apr. 0.0290 0.0246 0.0268
21:01-22:00, Wed., 16 Apr. 0.0283 0.0248 0.0265
20:01-21:00, Wed., 16 Apr. 0.0296 0.0253 0.0270
19:01-20:00, Wed., 16 Apr. 0.0290 0.0245 0.0270
18:01-19:00, Wed., 16 Apr. 0.0294 0.0252 0.0272
17:01-18:00, Wed., 16 Apr. 0.0285 0.0248 0.0271
16:01-17:00, Wed., 16 Apr. 0.0297 0.0256 0.0275
15:01-16:00, Wed., 16 Apr. 0.0298 0.0252 0.0277
14:01-15:00, Wed., 16 Apr. 0.0298 0.0252 0.0278