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, Wed., 02 Apr. 0.0271 0.0237 0.0256
20:01-21:00, Wed., 02 Apr. 0.0283 0.0239 0.0256
19:01-20:00, Wed., 02 Apr. 0.0280 0.0228 0.0257
18:01-19:00, Wed., 02 Apr. 0.0282 0.0236 0.0260
17:01-18:00, Wed., 02 Apr. 0.0301 0.0257 0.0278
16:01-17:00, Wed., 02 Apr. 0.0301 0.0257 0.0278
15:01-16:00, Wed., 02 Apr. 0.0299 0.0260 0.0275
14:01-15:00, Wed., 02 Apr. 0.0304 0.0253 0.0277
13:01-14:00, Wed., 02 Apr. 0.0289 0.0252 0.0270
12:01-13:00, Wed., 02 Apr. 0.0301 0.0256 0.0276
11:01-12:00, Wed., 02 Apr. 0.0311 0.0263 0.0284
10:01-11:00, Wed., 02 Apr. 0.0320 0.0278 0.0296
09:01-10:00, Wed., 02 Apr. 0.0324 0.0281 0.0307
08:01-09:00, Wed., 02 Apr. 0.0344 0.0298 0.0325
07:01-08:00, Wed., 02 Apr. 0.0374 0.0302 0.0342
06:01-07:00, Wed., 02 Apr. 0.0371 0.0322 0.0345
05:01-06:00, Wed., 02 Apr. 0.0413 0.0344 0.0378
04:01-05:00, Wed., 02 Apr. 0.0423 0.0364 0.0394
03:01-04:00, Wed., 02 Apr. 0.0421 0.0373 0.0393
02:01-03:00, Wed., 02 Apr. 0.0423 0.0367 0.0397
01:01-02:00, Wed., 02 Apr. 0.0417 0.0363 0.0395
00:01-01:00, Wed., 02 Apr. 0.0413 0.0371 0.0392
23:01-24:00, Tue., 01 Apr. 0.0419 0.0353 0.0389
22:01-23:00, Tue., 01 Apr. 0.0441 0.0389 0.0415
21:01-22:00, Tue., 01 Apr. 0.0437 0.0361 0.0399
20:01-21:00, Tue., 01 Apr. 0.0405 0.0356 0.0377
19:01-20:00, Tue., 01 Apr. 0.0396 0.0346 0.0375
18:01-19:00, Tue., 01 Apr. 0.0396 0.0348 0.0372
17:01-18:00, Tue., 01 Apr. 0.0413 0.0367 0.0389
16:01-17:00, Tue., 01 Apr. 0.0414 0.0344 0.0375
15:01-16:00, Tue., 01 Apr. 0.0393 0.0308 0.0359
14:01-15:00, Tue., 01 Apr. 0.0354 0.0294 0.0323
13:01-14:00, Tue., 01 Apr. 0.0429 0.0334 0.0384
12:01-13:00, Tue., 01 Apr. 0.0458 0.0395 0.0429
11:01-12:00, Tue., 01 Apr. 0.0467 0.0390 0.0415
10:01-11:00, Tue., 01 Apr. 0.0493 0.0422 0.0458
09:01-10:00, Tue., 01 Apr. 0.0468 0.0381 0.0426
08:01-09:00, Tue., 01 Apr. 0.0434 0.0382 0.0407
07:01-08:00, Tue., 01 Apr. 0.0435 0.0368 0.0401
06:01-07:00, Tue., 01 Apr. 0.0444 0.0353 0.0390
05:01-06:00, Tue., 01 Apr. 0.0421 0.0328 0.0367
04:01-05:00, Tue., 01 Apr. 0.0378 0.0313 0.0352
03:01-04:00, Tue., 01 Apr. 0.0351 0.0302 0.0327
02:01-03:00, Tue., 01 Apr. 0.0384 0.0326 0.0355
01:01-02:00, Tue., 01 Apr. 0.0372 0.0282 0.0328
00:01-01:00, Tue., 01 Apr. 0.0325 0.0274 0.0295
23:01-24:00, Mon., 31 Mar. 0.0326 0.0275 0.0303
22:01-23:00, Mon., 31 Mar. 0.0341 0.0287 0.0316
21:01-22:00, Mon., 31 Mar. 0.0340 0.0256 0.0298
20:01-21:00, Mon., 31 Mar. 0.0299 0.0257 0.0274
19:01-20:00, Mon., 31 Mar. 0.0301 0.0262 0.0280
18:01-19:00, Mon., 31 Mar. 0.0304 0.0256 0.0280
17:01-18:00, Mon., 31 Mar. 0.0294 0.0247 0.0270
16:01-17:00, Mon., 31 Mar. 0.0294 0.0252 0.0272
15:01-16:00, Mon., 31 Mar. 0.0294 0.0258 0.0274
14:01-15:00, Mon., 31 Mar. 0.0297 0.0252 0.0270
13:01-14:00, Mon., 31 Mar. 0.0303 0.0249 0.0274
12:01-13:00, Mon., 31 Mar. 0.0288 0.0248 0.0267
11:01-12:00, Mon., 31 Mar. 0.0284 0.0238 0.0267
10:01-11:00, Mon., 31 Mar. 0.0285 0.0235 0.0266
09:01-10:00, Mon., 31 Mar. 0.0283 0.0245 0.0265
08:01-09:00, Mon., 31 Mar. 0.0285 0.0250 0.0267
07:01-08:00, Mon., 31 Mar. 0.0298 0.0250 0.0267
06:01-07:00, Mon., 31 Mar. 0.0290 0.0247 0.0268
05:01-06:00, Mon., 31 Mar. 0.0286 0.0243 0.0268
04:01-05:00, Mon., 31 Mar. 0.0294 0.0249 0.0270
03:01-04:00, Mon., 31 Mar. 0.0280 0.0248 0.0267
02:01-03:00, Mon., 31 Mar. 0.0293 0.0242 0.0266
01:01-02:00, Mon., 31 Mar. 0.0290 0.0249 0.0265
00:01-01:00, Mon., 31 Mar. 0.0286 0.0244 0.0266
23:01-24:00, Sun., 30 Mar. 0.0286 0.0247 0.0266
22:01-23:00, Sun., 30 Mar. 0.0287 0.0241 0.0265
21:01-22:00, Sun., 30 Mar. 0.0286 0.0247 0.0266
20:01-21:00, Sun., 30 Mar. 0.0284 0.0249 0.0267
19:01-20:00, Sun., 30 Mar. 0.0288 0.0245 0.0265
18:01-19:00, Sun., 30 Mar. 0.0292 0.0242 0.0265
17:01-18:00, Sun., 30 Mar. 0.0290 0.0251 0.0268
16:01-17:00, Sun., 30 Mar. 0.0292 0.0248 0.0270
15:01-16:00, Sun., 30 Mar. 0.0290 0.0249 0.0270
14:01-15:00, Sun., 30 Mar. 0.0297 0.0248 0.0268
13:01-14:00, Sun., 30 Mar. 0.0296 0.0249 0.0269
12:01-13:00, Sun., 30 Mar. 0.0288 0.0252 0.0269
11:01-12:00, Sun., 30 Mar. 0.0287 0.0239 0.0265
10:01-11:00, Sun., 30 Mar. 0.0285 0.0246 0.0266
09:01-10:00, Sun., 30 Mar. 0.0297 0.0252 0.0266
08:01-09:00, Sun., 30 Mar. 0.0292 0.0247 0.0268
07:01-08:00, Sun., 30 Mar. 0.0299 0.0245 0.0266
06:01-07:00, Sun., 30 Mar. 0.0297 0.0252 0.0267
05:01-06:00, Sun., 30 Mar. 0.0288 0.0252 0.0268
04:01-05:00, Sun., 30 Mar. 0.0286 0.0249 0.0268
03:01-04:00, Sun., 30 Mar. 0.0297 0.0248 0.0271
02:01-03:00, Sun., 30 Mar. 0.0286 0.0248 0.0269
01:01-02:00, Sun., 30 Mar. 0.0301 0.0252 0.0276
00:01-01:00, Sun., 30 Mar. 0.0290 0.0257 0.0273
23:01-24:00, Sat., 29 Mar. 0.0291 0.0249 0.0265
22:01-23:00, Sat., 29 Mar. 0.0290 0.0246 0.0265
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