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
21:01-22:00, Sat., 29 Mar. 0.0290 0.0248 0.0266
20:01-21:00, Sat., 29 Mar. 0.0305 0.0254 0.0270
19:01-20:00, Sat., 29 Mar. 0.0300 0.0260 0.0278
18:01-19:00, Sat., 29 Mar. 0.0335 0.0272 0.0304
17:01-18:00, Sat., 29 Mar. 0.0359 0.0306 0.0335
16:01-17:00, Sat., 29 Mar. 0.0371 0.0320 0.0346
15:01-16:00, Sat., 29 Mar. 0.0391 0.0326 0.0354
14:01-15:00, Sat., 29 Mar. 0.0467 0.0322 0.0410
13:01-14:00, Sat., 29 Mar. 0.0497 0.0437 0.0472
12:01-13:00, Sat., 29 Mar. 0.0485 0.0432 0.0462
11:01-12:00, Sat., 29 Mar. 0.0513 0.0440 0.0468
10:01-11:00, Sat., 29 Mar. 0.0545 0.0480 0.0516
09:01-10:00, Sat., 29 Mar. 0.0527 0.0433 0.0480
08:01-09:00, Sat., 29 Mar. 0.0562 0.0455 0.0512
07:01-08:00, Sat., 29 Mar. 0.0481 0.0397 0.0440
06:01-07:00, Sat., 29 Mar. 0.0447 0.0353 0.0406
05:01-06:00, Sat., 29 Mar. 0.0363 0.0256 0.0297
04:01-05:00, Sat., 29 Mar. 0.0289 0.0254 0.0276
03:01-04:00, Sat., 29 Mar. 0.0304 0.0262 0.0279
02:01-03:00, Sat., 29 Mar. 0.0298 0.0249 0.0278
01:01-02:00, Sat., 29 Mar. 0.0291 0.0254 0.0274
00:01-01:00, Sat., 29 Mar. 0.0301 0.0253 0.0278
23:01-24:00, Fri., 28 Mar. 0.0310 0.0254 0.0281
22:01-23:00, Fri., 28 Mar. 0.0308 0.0258 0.0282
21:01-22:00, Fri., 28 Mar. 0.0300 0.0254 0.0284
20:01-21:00, Fri., 28 Mar. 0.0301 0.0259 0.0281
19:01-20:00, Fri., 28 Mar. 0.0297 0.0259 0.0280
18:01-19:00, Fri., 28 Mar. 0.0298 0.0258 0.0278
17:01-18:00, Fri., 28 Mar. 0.0297 0.0258 0.0276
16:01-17:00, Fri., 28 Mar. 0.0294 0.0256 0.0274
15:01-16:00, Fri., 28 Mar. 0.0294 0.0254 0.0274
14:01-15:00, Fri., 28 Mar. 0.0297 0.0253 0.0272
13:01-14:00, Fri., 28 Mar. 0.0291 0.0255 0.0274
12:01-13:00, Fri., 28 Mar. 0.0294 0.0261 0.0276
11:01-12:00, Fri., 28 Mar. 0.0298 0.0263 0.0280
10:01-11:00, Fri., 28 Mar. 0.0321 0.0265 0.0290
09:01-10:00, Fri., 28 Mar. 0.0368 0.0276 0.0322
08:01-09:00, Fri., 28 Mar. 0.0478 0.0350 0.0419
07:01-08:00, Fri., 28 Mar. 0.0466 0.0305 0.0394
06:01-07:00, Fri., 28 Mar. 0.0317 0.0257 0.0292
05:01-06:00, Fri., 28 Mar. 0.0298 0.0260 0.0278
04:01-05:00, Fri., 28 Mar. 0.0299 0.0259 0.0279
03:01-04:00, Fri., 28 Mar. 0.0308 0.0256 0.0284
02:01-03:00, Fri., 28 Mar. 0.0297 0.0258 0.0275
01:01-02:00, Fri., 28 Mar. 0.0294 0.0242 0.0274
00:01-01:00, Fri., 28 Mar. 0.0300 0.0258 0.0274
23:01-24:00, Thu., 27 Mar. 0.0304 0.0249 0.0271
22:01-23:00, Thu., 27 Mar. 0.0301 0.0245 0.0272
21:01-22:00, Thu., 27 Mar. 0.0286 0.0249 0.0270
20:01-21:00, Thu., 27 Mar. 0.0295 0.0252 0.0273
19:01-20:00, Thu., 27 Mar. 0.0293 0.0249 0.0273
18:01-19:00, Thu., 27 Mar. 0.0301 0.0249 0.0273
17:01-18:00, Thu., 27 Mar. 0.0297 0.0258 0.0276
16:01-17:00, Thu., 27 Mar. 0.0295 0.0251 0.0274
15:01-16:00, Thu., 27 Mar. 0.0298 0.0259 0.0279
14:01-15:00, Thu., 27 Mar. 0.0302 0.0257 0.0279
13:01-14:00, Thu., 27 Mar. 0.0309 0.0259 0.0282
12:01-13:00, Thu., 27 Mar. 0.0302 0.0266 0.0281
11:01-12:00, Thu., 27 Mar. 0.0309 0.0257 0.0280
10:01-11:00, Thu., 27 Mar. 0.0304 0.0256 0.0280
09:01-10:00, Thu., 27 Mar. 0.0310 0.0263 0.0281
08:01-09:00, Thu., 27 Mar. 0.0308 0.0266 0.0285
07:01-08:00, Thu., 27 Mar. 0.0314 0.0263 0.0284
06:01-07:00, Thu., 27 Mar. 0.0300 0.0270 0.0283
05:01-06:00, Thu., 27 Mar. 0.0312 0.0263 0.0281
04:01-05:00, Thu., 27 Mar. 0.0298 0.0259 0.0281
03:01-04:00, Thu., 27 Mar. 0.0310 0.0259 0.0279
02:01-03:00, Thu., 27 Mar. 0.0294 0.0256 0.0277
01:01-02:00, Thu., 27 Mar. 0.0300 0.0254 0.0278
00:01-01:00, Thu., 27 Mar. 0.0299 0.0262 0.0278
23:01-24:00, Wed., 26 Mar. 0.0298 0.0256 0.0280
22:01-23:00, Wed., 26 Mar. 0.0304 0.0262 0.0281
21:01-22:00, Wed., 26 Mar. 0.0304 0.0263 0.0280
20:01-21:00, Wed., 26 Mar. 0.0310 0.0257 0.0279
19:01-20:00, Wed., 26 Mar. 0.0306 0.0260 0.0277
18:01-19:00, Wed., 26 Mar. 0.0302 0.0260 0.0277
17:01-18:00, Wed., 26 Mar. 0.0297 0.0261 0.0278
16:01-17:00, Wed., 26 Mar. 0.0299 0.0262 0.0279
15:01-16:00, Wed., 26 Mar. 0.0301 0.0262 0.0279
14:01-15:00, Wed., 26 Mar. 0.0309 0.0260 0.0280
13:01-14:00, Wed., 26 Mar. 0.0305 0.0256 0.0282
12:01-13:00, Wed., 26 Mar. 0.0305 0.0262 0.0285
11:01-12:00, Wed., 26 Mar. 0.0303 0.0262 0.0285
10:01-11:00, Wed., 26 Mar. 0.0300 0.0263 0.0281
09:01-10:00, Wed., 26 Mar. 0.0302 0.0257 0.0282
08:01-09:00, Wed., 26 Mar. 0.0293 0.0250 0.0279
07:01-08:00, Wed., 26 Mar. 0.0305 0.0264 0.0282
06:01-07:00, Wed., 26 Mar. 0.0298 0.0249 0.0276
05:01-06:00, Wed., 26 Mar. 0.0299 0.0256 0.0273
04:01-05:00, Wed., 26 Mar. 0.0294 0.0252 0.0275
03:01-04:00, Wed., 26 Mar. 0.0300 0.0258 0.0277
02:01-03:00, Wed., 26 Mar. 0.0306 0.0252 0.0276
01:01-02:00, Wed., 26 Mar. 0.0294 0.0249 0.0276
00:01-01:00, Wed., 26 Mar. 0.0298 0.0256 0.0277
23:01-24:00, Tue., 25 Mar. 0.0301 0.0255 0.0279
22:01-23:00, Tue., 25 Mar. 0.0295 0.0261 0.0279
21:01-22:00, Tue., 25 Mar. 0.0300 0.0263 0.0280
20:01-21:00, Tue., 25 Mar. 0.0307 0.0252 0.0281
19:01-20:00, Tue., 25 Mar. 0.0305 0.0252 0.0279
18:01-19:00, Tue., 25 Mar. 0.0306 0.0258 0.0278
17:01-18:00, Tue., 25 Mar. 0.0309 0.0258 0.0278
16:01-17:00, Tue., 25 Mar. 0.0297 0.0259 0.0279
15:01-16:00, Tue., 25 Mar. 0.0304 0.0258 0.0278
14:01-15:00, Tue., 25 Mar. 0.0299 0.0262 0.0278
13:01-14:00, Tue., 25 Mar. 0.0304 0.0255 0.0277
12:01-13:00, Tue., 25 Mar. 0.0299 0.0252 0.0277
11:01-12:00, Tue., 25 Mar. 0.0298 0.0257 0.0278
10:01-11:00, Tue., 25 Mar. 0.0299 0.0252 0.0279
09:01-10:00, Tue., 25 Mar. 0.0293 0.0263 0.0276
08:01-09:00, Tue., 25 Mar. 0.0297 0.0258 0.0278
07:01-08:00, Tue., 25 Mar. 0.0297 0.0251 0.0274
06:01-07:00, Tue., 25 Mar. 0.0293 0.0252 0.0276
05:01-06:00, Tue., 25 Mar. 0.0298 0.0262 0.0279
04:01-05:00, Tue., 25 Mar. 0.0298 0.0255 0.0279
03:01-04:00, Tue., 25 Mar. 0.0298 0.0261 0.0280
02:01-03:00, Tue., 25 Mar. 0.0298 0.0260 0.0278
01:01-02:00, Tue., 25 Mar. 0.0294 0.0255 0.0275
00:01-01:00, Tue., 25 Mar. 0.0302 0.0256 0.0278
23:01-24:00, Mon., 24 Mar. 0.0298 0.0259 0.0277
22:01-23:00, Mon., 24 Mar. 0.0296 0.0256 0.0276
21:01-22:00, Mon., 24 Mar. 0.0297 0.0253 0.0274
20:01-21:00, Mon., 24 Mar. 0.0290 0.0235 0.0271
19:01-20:00, Mon., 24 Mar. 0.0292 0.0256 0.0272
18:01-19:00, Mon., 24 Mar. 0.0291 0.0257 0.0273
17:01-18:00, Mon., 24 Mar. 0.0293 0.0258 0.0274
16:01-17:00, Mon., 24 Mar. 0.0290 0.0255 0.0274
15:01-16:00, Mon., 24 Mar. 0.0298 0.0259 0.0275
14:01-15:00, Mon., 24 Mar. 0.0294 0.0253 0.0274
13:01-14:00, Mon., 24 Mar. 0.0297 0.0256 0.0274
12:01-13:00, Mon., 24 Mar. 0.0299 0.0254 0.0273
11:01-12:00, Mon., 24 Mar. 0.0288 0.0253 0.0273
10:01-11:00, Mon., 24 Mar. 0.0299 0.0261 0.0277
09:01-10:00, Mon., 24 Mar. 0.0293 0.0249 0.0273
08:01-09:00, Mon., 24 Mar. 0.0295 0.0252 0.0279
07:01-08:00, Mon., 24 Mar. 0.0297 0.0263 0.0278
06:01-07:00, Mon., 24 Mar. 0.0297 0.0251 0.0278
05:01-06:00, Mon., 24 Mar. 0.0302 0.0259 0.0275
04:01-05:00, Mon., 24 Mar. 0.0293 0.0258 0.0274
03:01-04:00, Mon., 24 Mar. 0.0294 0.0245 0.0272
02:01-03:00, Mon., 24 Mar. 0.0296 0.0256 0.0274
01:01-02:00, Mon., 24 Mar. 0.0289 0.0256 0.0274
00:01-01:00, Mon., 24 Mar. 0.0299 0.0254 0.0273
23:01-24:00, Sun., 23 Mar. 0.0295 0.0258 0.0273
22:01-23:00, Sun., 23 Mar. 0.0300 0.0253 0.0273
21:01-22:00, Sun., 23 Mar. 0.0293 0.0254 0.0271
20:01-21:00, Sun., 23 Mar. 0.0307 0.0245 0.0273
19:01-20:00, Sun., 23 Mar. 0.0299 0.0255 0.0275
18:01-19:00, Sun., 23 Mar. 0.0295 0.0256 0.0274
17:01-18:00, Sun., 23 Mar. 0.0295 0.0249 0.0277
16:01-17:00, Sun., 23 Mar. 0.0294 0.0248 0.0273
15:01-16:00, Sun., 23 Mar. 0.0296 0.0257 0.0274
14:01-15:00, Sun., 23 Mar. 0.0294 0.0253 0.0275
13:01-14:00, Sun., 23 Mar. 0.0296 0.0256 0.0275
12:01-13:00, Sun., 23 Mar. 0.0302 0.0252 0.0278
11:01-12:00, Sun., 23 Mar. 0.0294 0.0256 0.0274
10:01-11:00, Sun., 23 Mar. 0.0297 0.0260 0.0279
09:01-10:00, Sun., 23 Mar. 0.0305 0.0259 0.0281
08:01-09:00, Sun., 23 Mar. 0.0301 0.0257 0.0279
07:01-08:00, Sun., 23 Mar. 0.0296 0.0255 0.0275
06:01-07:00, Sun., 23 Mar. 0.0294 0.0252 0.0273
05:01-06:00, Sun., 23 Mar. 0.0287 0.0257 0.0270
04:01-05:00, Sun., 23 Mar. 0.0289 0.0252 0.0271
03:01-04:00, Sun., 23 Mar. 0.0288 0.0252 0.0271
02:01-03:00, Sun., 23 Mar. 0.0297 0.0245 0.0271
01:01-02:00, Sun., 23 Mar. 0.0283 0.0251 0.0270
00:01-01:00, Sun., 23 Mar. 0.0297 0.0250 0.0271
23:01-24:00, Sat., 22 Mar. 0.0288 0.0249 0.0273
22:01-23:00, Sat., 22 Mar. 0.0297 0.0251 0.0277
21:01-22:00, Sat., 22 Mar. 0.0297 0.0248 0.0277
20:01-21:00, Sat., 22 Mar. 0.0291 0.0261 0.0276
19:01-20:00, Sat., 22 Mar. 0.0298 0.0247 0.0274
18:01-19:00, Sat., 22 Mar. 0.0297 0.0242 0.0271
17:01-18:00, Sat., 22 Mar. 0.0299 0.0257 0.0277
16:01-17:00, Sat., 22 Mar. 0.0292 0.0260 0.0276
15:01-16:00, Sat., 22 Mar. 0.0292 0.0251 0.0272
14:01-15:00, Sat., 22 Mar. 0.0306 0.0256 0.0276
13:01-14:00, Sat., 22 Mar. 0.0304 0.0257 0.0276
12:01-13:00, Sat., 22 Mar. 0.0302 0.0259 0.0278
11:01-12:00, Sat., 22 Mar. 0.0294 0.0259 0.0277
10:01-11:00, Sat., 22 Mar. 0.0319 0.0251 0.0277
09:01-10:00, Sat., 22 Mar. 0.0297 0.0260 0.0276
08:01-09:00, Sat., 22 Mar. 0.0295 0.0245 0.0274
07:01-08:00, Sat., 22 Mar. 0.0299 0.0251 0.0276
06:01-07:00, Sat., 22 Mar. 0.0297 0.0252 0.0279
05:01-06:00, Sat., 22 Mar. 0.0300 0.0258 0.0279
04:01-05:00, Sat., 22 Mar. 0.0298 0.0261 0.0279
03:01-04:00, Sat., 22 Mar. 0.0295 0.0259 0.0280
02:01-03:00, Sat., 22 Mar. 0.0312 0.0256 0.0279
01:01-02:00, Sat., 22 Mar. 0.0292 0.0253 0.0276
00:01-01:00, Sat., 22 Mar. 0.0308 0.0256 0.0271
23:01-24:00, Fri., 21 Mar. 0.0298 0.0252 0.0274
22:01-23:00, Fri., 21 Mar. 0.0295 0.0252 0.0273
21:01-22:00, Fri., 21 Mar. 0.0293 0.0252 0.0273
20:01-21:00, Fri., 21 Mar. 0.0296 0.0252 0.0272
19:01-20:00, Fri., 21 Mar. 0.0299 0.0250 0.0271
18:01-19:00, Fri., 21 Mar. 0.0286 0.0250 0.0269
17:01-18:00, Fri., 21 Mar. 0.0304 0.0252 0.0274
16:01-17:00, Fri., 21 Mar. 0.0294 0.0255 0.0274
15:01-16:00, Fri., 21 Mar. 0.0300 0.0252 0.0274
14:01-15:00, Fri., 21 Mar. 0.0295 0.0253 0.0275
13:01-14:00, Fri., 21 Mar. 0.0297 0.0256 0.0273
12:01-13:00, Fri., 21 Mar. 0.0290 0.0259 0.0272
11:01-12:00, Fri., 21 Mar. 0.0291 0.0252 0.0274
10:01-11:00, Fri., 21 Mar. 0.0304 0.0249 0.0273
09:01-10:00, Fri., 21 Mar. 0.0297 0.0252 0.0275
08:01-09:00, Fri., 21 Mar. 0.0296 0.0259 0.0280
07:01-08:00, Fri., 21 Mar. 0.0323 0.0270 0.0287
06:01-07:00, Fri., 21 Mar. 0.0305 0.0265 0.0287
05:01-06:00, Fri., 21 Mar. 0.0301 0.0259 0.0284
04:01-05:00, Fri., 21 Mar. 0.0300 0.0249 0.0277
03:01-04:00, Fri., 21 Mar. 0.0295 0.0250 0.0273
02:01-03:00, Fri., 21 Mar. 0.0295 0.0256 0.0275
01:01-02:00, Fri., 21 Mar. 0.0309 0.0250 0.0282
00:01-01:00, Fri., 21 Mar. 0.0297 0.0259 0.0281
23:01-24:00, Thu., 20 Mar. 0.0308 0.0256 0.0273
22:01-23:00, Thu., 20 Mar. 0.0291 0.0233 0.0264
21:01-22:00, Thu., 20 Mar. 0.0289 0.0240 0.0263
20:01-21:00, Thu., 20 Mar. 0.0285 0.0238 0.0265
19:01-20:00, Thu., 20 Mar. 0.0280 0.0241 0.0264
18:01-19:00, Thu., 20 Mar. 0.0293 0.0245 0.0267
17:01-18:00, Thu., 20 Mar. 0.0292 0.0246 0.0264
16:01-17:00, Thu., 20 Mar. 0.0283 0.0251 0.0268
15:01-16:00, Thu., 20 Mar. 0.0284 0.0252 0.0268
14:01-15:00, Thu., 20 Mar. 0.0291 0.0249 0.0269
13:01-14:00, Thu., 20 Mar. 0.0289 0.0249 0.0268
12:01-13:00, Thu., 20 Mar. 0.0290 0.0251 0.0268
11:01-12:00, Thu., 20 Mar. 0.0297 0.0245 0.0268
10:01-11:00, Thu., 20 Mar. 0.0290 0.0245 0.0266
09:01-10:00, Thu., 20 Mar. 0.0284 0.0248 0.0267
08:01-09:00, Thu., 20 Mar. 0.0294 0.0249 0.0269
07:01-08:00, Thu., 20 Mar. 0.0284 0.0246 0.0268
06:01-07:00, Thu., 20 Mar. 0.0290 0.0249 0.0267
05:01-06:00, Thu., 20 Mar. 0.0304 0.0245 0.0266
04:01-05:00, Thu., 20 Mar. 0.0280 0.0242 0.0266
03:01-04:00, Thu., 20 Mar. 0.0294 0.0246 0.0267
02:01-03:00, Thu., 20 Mar. 0.0298 0.0244 0.0270
01:01-02:00, Thu., 20 Mar. 0.0295 0.0251 0.0269
00:01-01:00, Thu., 20 Mar. 0.0287 0.0245 0.0268
23:01-24:00, Wed., 19 Mar. 0.0290 0.0245 0.0264
22:01-23:00, Wed., 19 Mar. 0.0286 0.0246 0.0265