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
10:01-11:00, Fri., 27 Mar. 0.0289 0.0247 0.0273
09:01-10:00, Fri., 27 Mar. 0.0304 0.0249 0.0273
08:01-09:00, Fri., 27 Mar. 0.0295 0.0247 0.0274
07:01-08:00, Fri., 27 Mar. 0.0295 0.0252 0.0274
06:01-07:00, Fri., 27 Mar. 0.0287 0.0254 0.0271
05:01-06:00, Fri., 27 Mar. 0.0287 0.0249 0.0271
04:01-05:00, Fri., 27 Mar. 0.0299 0.0245 0.0270
03:01-04:00, Fri., 27 Mar. 0.0294 0.0243 0.0269
02:01-03:00, Fri., 27 Mar. 0.0298 0.0249 0.0271
01:01-02:00, Fri., 27 Mar. 0.0297 0.0245 0.0271
00:01-01:00, Fri., 27 Mar. 0.0294 0.0252 0.0269
23:01-24:00, Thu., 26 Mar. 0.0288 0.0249 0.0268
22:01-23:00, Thu., 26 Mar. 0.0289 0.0246 0.0268
21:01-22:00, Thu., 26 Mar. 0.0286 0.0249 0.0266
20:01-21:00, Thu., 26 Mar. 0.0295 0.0251 0.0269
19:01-20:00, Thu., 26 Mar. 0.0287 0.0249 0.0270
18:01-19:00, Thu., 26 Mar. 0.0295 0.0254 0.0271
17:01-18:00, Thu., 26 Mar. 0.0294 0.0252 0.0273
16:01-17:00, Thu., 26 Mar. 0.0310 0.0257 0.0282
15:01-16:00, Thu., 26 Mar. 0.0317 0.0266 0.0291
14:01-15:00, Thu., 26 Mar. 0.0338 0.0292 0.0316
13:01-14:00, Thu., 26 Mar. 0.0349 0.0283 0.0322
12:01-13:00, Thu., 26 Mar. 0.0338 0.0289 0.0316
11:01-12:00, Thu., 26 Mar. 0.0341 0.0301 0.0321
10:01-11:00, Thu., 26 Mar. 0.0365 0.0315 0.0339
09:01-10:00, Thu., 26 Mar. 0.0374 0.0311 0.0341
08:01-09:00, Thu., 26 Mar. 0.0353 0.0309 0.0333
07:01-08:00, Thu., 26 Mar. 0.0375 0.0317 0.0341
06:01-07:00, Thu., 26 Mar. 0.0395 0.0324 0.0360
05:01-06:00, Thu., 26 Mar. 0.0394 0.0334 0.0365
04:01-05:00, Thu., 26 Mar. 0.0395 0.0326 0.0360
03:01-04:00, Thu., 26 Mar. 0.0392 0.0337 0.0368
02:01-03:00, Thu., 26 Mar. 0.0375 0.0332 0.0353
01:01-02:00, Thu., 26 Mar. 0.0370 0.0319 0.0344
00:01-01:00, Thu., 26 Mar. 0.0373 0.0322 0.0351
23:01-24:00, Wed., 25 Mar. 0.0398 0.0346 0.0366
22:01-23:00, Wed., 25 Mar. 0.0370 0.0321 0.0353
21:01-22:00, Wed., 25 Mar. 0.0404 0.0338 0.0360
20:01-21:00, Wed., 25 Mar. 0.0397 0.0349 0.0376
19:01-20:00, Wed., 25 Mar. 0.0405 0.0349 0.0375
18:01-19:00, Wed., 25 Mar. 0.0395 0.0349 0.0370
17:01-18:00, Wed., 25 Mar. 0.0381 0.0329 0.0361
16:01-17:00, Wed., 25 Mar. 0.0391 0.0336 0.0366
15:01-16:00, Wed., 25 Mar. 0.0388 0.0339 0.0363
14:01-15:00, Wed., 25 Mar. 0.0392 0.0347 0.0371
13:01-14:00, Wed., 25 Mar. 0.0395 0.0320 0.0350
12:01-13:00, Wed., 25 Mar. 0.0351 0.0281 0.0314
11:01-12:00, Wed., 25 Mar. 0.0311 0.0263 0.0289
10:01-11:00, Wed., 25 Mar. 0.0302 0.0261 0.0283
09:01-10:00, Wed., 25 Mar. 0.0301 0.0253 0.0281
08:01-09:00, Wed., 25 Mar. 0.0306 0.0265 0.0285
07:01-08:00, Wed., 25 Mar. 0.0300 0.0259 0.0285
06:01-07:00, Wed., 25 Mar. 0.0304 0.0259 0.0281
05:01-06:00, Wed., 25 Mar. 0.0299 0.0260 0.0284
04:01-05:00, Wed., 25 Mar. 0.0302 0.0257 0.0282
03:01-04:00, Wed., 25 Mar. 0.0298 0.0258 0.0282
02:01-03:00, Wed., 25 Mar. 0.0297 0.0260 0.0279
01:01-02:00, Wed., 25 Mar. 0.0301 0.0253 0.0277
00:01-01:00, Wed., 25 Mar. 0.0301 0.0262 0.0278
23:01-24:00, Tue., 24 Mar. 0.0294 0.0262 0.0277
22:01-23:00, Tue., 24 Mar. 0.0301 0.0249 0.0277
21:01-22:00, Tue., 24 Mar. 0.0296 0.0259 0.0278
20:01-21:00, Tue., 24 Mar. 0.0301 0.0256 0.0277
19:01-20:00, Tue., 24 Mar. 0.0300 0.0252 0.0276
18:01-19:00, Tue., 24 Mar. 0.0307 0.0260 0.0279
17:01-18:00, Tue., 24 Mar. 0.0296 0.0259 0.0278
16:01-17:00, Tue., 24 Mar. 0.0299 0.0256 0.0278
15:01-16:00, Tue., 24 Mar. 0.0298 0.0249 0.0277
14:01-15:00, Tue., 24 Mar. 0.0305 0.0260 0.0280
13:01-14:00, Tue., 24 Mar. 0.0298 0.0252 0.0279
12:01-13:00, Tue., 24 Mar. 0.0304 0.0264 0.0282
11:01-12:00, Tue., 24 Mar. 0.0301 0.0252 0.0281
10:01-11:00, Tue., 24 Mar. 0.0308 0.0263 0.0282
09:01-10:00, Tue., 24 Mar. 0.0300 0.0263 0.0281
08:01-09:00, Tue., 24 Mar. 0.0294 0.0259 0.0279
07:01-08:00, Tue., 24 Mar. 0.0300 0.0259 0.0279
06:01-07:00, Tue., 24 Mar. 0.0301 0.0252 0.0279
05:01-06:00, Tue., 24 Mar. 0.0301 0.0259 0.0278
04:01-05:00, Tue., 24 Mar. 0.0294 0.0252 0.0278
03:01-04:00, Tue., 24 Mar. 0.0303 0.0260 0.0279
02:01-03:00, Tue., 24 Mar. 0.0296 0.0255 0.0278
01:01-02:00, Tue., 24 Mar. 0.0299 0.0259 0.0280
00:01-01:00, Tue., 24 Mar. 0.0310 0.0254 0.0278
23:01-24:00, Mon., 23 Mar. 0.0295 0.0252 0.0278
22:01-23:00, Mon., 23 Mar. 0.0293 0.0251 0.0275
21:01-22:00, Mon., 23 Mar. 0.0298 0.0258 0.0277
20:01-21:00, Mon., 23 Mar. 0.0299 0.0256 0.0273
19:01-20:00, Mon., 23 Mar. 0.0299 0.0256 0.0274
18:01-19:00, Mon., 23 Mar. 0.0295 0.0256 0.0274
17:01-18:00, Mon., 23 Mar. 0.0300 0.0259 0.0277
16:01-17:00, Mon., 23 Mar. 0.0298 0.0250 0.0278
15:01-16:00, Mon., 23 Mar. 0.0298 0.0252 0.0278
14:01-15:00, Mon., 23 Mar. 0.0297 0.0259 0.0277
13:01-14:00, Mon., 23 Mar. 0.0299 0.0256 0.0278
12:01-13:00, Mon., 23 Mar. 0.0318 0.0252 0.0281
11:01-12:00, Mon., 23 Mar. 0.0306 0.0266 0.0288
10:01-11:00, Mon., 23 Mar. 0.0328 0.0283 0.0306
09:01-10:00, Mon., 23 Mar. 0.0332 0.0284 0.0311
08:01-09:00, Mon., 23 Mar. 0.0359 0.0304 0.0331
07:01-08:00, Mon., 23 Mar. 0.0354 0.0298 0.0328
06:01-07:00, Mon., 23 Mar. 0.0345 0.0266 0.0297
05:01-06:00, Mon., 23 Mar. 0.0311 0.0261 0.0285
04:01-05:00, Mon., 23 Mar. 0.0303 0.0266 0.0285
03:01-04:00, Mon., 23 Mar. 0.0309 0.0261 0.0281
02:01-03:00, Mon., 23 Mar. 0.0298 0.0260 0.0280
01:01-02:00, Mon., 23 Mar. 0.0312 0.0266 0.0286
00:01-01:00, Mon., 23 Mar. 0.0301 0.0259 0.0283
23:01-24:00, Sun., 22 Mar. 0.0301 0.0264 0.0286
22:01-23:00, Sun., 22 Mar. 0.0310 0.0259 0.0283
21:01-22:00, Sun., 22 Mar. 0.0308 0.0262 0.0285
20:01-21:00, Sun., 22 Mar. 0.0310 0.0259 0.0282
19:01-20:00, Sun., 22 Mar. 0.0299 0.0264 0.0282
18:01-19:00, Sun., 22 Mar. 0.0295 0.0267 0.0280
17:01-18:00, Sun., 22 Mar. 0.0301 0.0265 0.0279
16:01-17:00, Sun., 22 Mar. 0.0298 0.0263 0.0281
15:01-16:00, Sun., 22 Mar. 0.0303 0.0258 0.0282
14:01-15:00, Sun., 22 Mar. 0.0310 0.0259 0.0283
13:01-14:00, Sun., 22 Mar. 0.0310 0.0259 0.0283
12:01-13:00, Sun., 22 Mar. 0.0308 0.0261 0.0282
11:01-12:00, Sun., 22 Mar. 0.0299 0.0262 0.0284
10:01-11:00, Sun., 22 Mar. 0.0310 0.0264 0.0285
09:01-10:00, Sun., 22 Mar. 0.0297 0.0263 0.0286
08:01-09:00, Sun., 22 Mar. 0.0310 0.0272 0.0288
07:01-08:00, Sun., 22 Mar. 0.0316 0.0263 0.0289
06:01-07:00, Sun., 22 Mar. 0.0312 0.0265 0.0289
05:01-06:00, Sun., 22 Mar. 0.0305 0.0261 0.0283
04:01-05:00, Sun., 22 Mar. 0.0301 0.0264 0.0282
03:01-04:00, Sun., 22 Mar. 0.0310 0.0263 0.0282
02:01-03:00, Sun., 22 Mar. 0.0301 0.0260 0.0283
01:01-02:00, Sun., 22 Mar. 0.0297 0.0262 0.0279
00:01-01:00, Sun., 22 Mar. 0.0301 0.0263 0.0282
23:01-24:00, Sat., 21 Mar. 0.0299 0.0259 0.0282
22:01-23:00, Sat., 21 Mar. 0.0310 0.0259 0.0282
21:01-22:00, Sat., 21 Mar. 0.0308 0.0256 0.0279
20:01-21:00, Sat., 21 Mar. 0.0295 0.0258 0.0275
19:01-20:00, Sat., 21 Mar. 0.0299 0.0256 0.0276
18:01-19:00, Sat., 21 Mar. 0.0299 0.0254 0.0277
17:01-18:00, Sat., 21 Mar. 0.0297 0.0249 0.0279
16:01-17:00, Sat., 21 Mar. 0.0296 0.0254 0.0276
15:01-16:00, Sat., 21 Mar. 0.0305 0.0260 0.0279
14:01-15:00, Sat., 21 Mar. 0.0304 0.0254 0.0279
13:01-14:00, Sat., 21 Mar. 0.0308 0.0261 0.0282
12:01-13:00, Sat., 21 Mar. 0.0298 0.0255 0.0281
11:01-12:00, Sat., 21 Mar. 0.0302 0.0263 0.0282
10:01-11:00, Sat., 21 Mar. 0.0299 0.0258 0.0282
09:01-10:00, Sat., 21 Mar. 0.0297 0.0262 0.0277
08:01-09:00, Sat., 21 Mar. 0.0298 0.0254 0.0281
07:01-08:00, Sat., 21 Mar. 0.0298 0.0257 0.0280
06:01-07:00, Sat., 21 Mar. 0.0298 0.0262 0.0281
05:01-06:00, Sat., 21 Mar. 0.0308 0.0259 0.0276
04:01-05:00, Sat., 21 Mar. 0.0298 0.0256 0.0275
03:01-04:00, Sat., 21 Mar. 0.0294 0.0256 0.0276
02:01-03:00, Sat., 21 Mar. 0.0299 0.0265 0.0281
01:01-02:00, Sat., 21 Mar. 0.0305 0.0252 0.0281
00:01-01:00, Sat., 21 Mar. 0.0305 0.0259 0.0278
23:01-24:00, Fri., 20 Mar. 0.0297 0.0249 0.0276
22:01-23:00, Fri., 20 Mar. 0.0301 0.0253 0.0277
21:01-22:00, Fri., 20 Mar. 0.0298 0.0258 0.0275
20:01-21:00, Fri., 20 Mar. 0.0299 0.0259 0.0277
19:01-20:00, Fri., 20 Mar. 0.0308 0.0257 0.0280
18:01-19:00, Fri., 20 Mar. 0.0304 0.0252 0.0281
17:01-18:00, Fri., 20 Mar. 0.0308 0.0263 0.0285
16:01-17:00, Fri., 20 Mar. 0.0298 0.0264 0.0282
15:01-16:00, Fri., 20 Mar. 0.0304 0.0259 0.0284
14:01-15:00, Fri., 20 Mar. 0.0325 0.0275 0.0296
13:01-14:00, Fri., 20 Mar. 0.0343 0.0301 0.0319
12:01-13:00, Fri., 20 Mar. 0.0367 0.0303 0.0338
11:01-12:00, Fri., 20 Mar. 0.0361 0.0290 0.0328
10:01-11:00, Fri., 20 Mar. 0.0425 0.0329 0.0377
09:01-10:00, Fri., 20 Mar. 0.0339 0.0279 0.0305
08:01-09:00, Fri., 20 Mar. 0.0343 0.0298 0.0317
07:01-08:00, Fri., 20 Mar. 0.0336 0.0264 0.0290
06:01-07:00, Fri., 20 Mar. 0.0299 0.0257 0.0281
05:01-06:00, Fri., 20 Mar. 0.0308 0.0263 0.0283
04:01-05:00, Fri., 20 Mar. 0.0303 0.0263 0.0282
03:01-04:00, Fri., 20 Mar. 0.0297 0.0265 0.0281
02:01-03:00, Fri., 20 Mar. 0.0305 0.0261 0.0283
01:01-02:00, Fri., 20 Mar. 0.0306 0.0263 0.0291
00:01-01:00, Fri., 20 Mar. 0.0353 0.0287 0.0317
23:01-24:00, Thu., 19 Mar. 0.0386 0.0333 0.0358
22:01-23:00, Thu., 19 Mar. 0.0381 0.0261 0.0303
21:01-22:00, Thu., 19 Mar. 0.0293 0.0262 0.0279
20:01-21:00, Thu., 19 Mar. 0.0297 0.0259 0.0277
19:01-20:00, Thu., 19 Mar. 0.0294 0.0261 0.0279
18:01-19:00, Thu., 19 Mar. 0.0304 0.0258 0.0279
17:01-18:00, Thu., 19 Mar. 0.0308 0.0263 0.0281
16:01-17:00, Thu., 19 Mar. 0.0301 0.0262 0.0281
15:01-16:00, Thu., 19 Mar. 0.0310 0.0262 0.0282
14:01-15:00, Thu., 19 Mar. 0.0313 0.0259 0.0283
13:01-14:00, Thu., 19 Mar. 0.0308 0.0269 0.0288
12:01-13:00, Thu., 19 Mar. 0.0304 0.0268 0.0286
11:01-12:00, Thu., 19 Mar. 0.0308 0.0270 0.0287
10:01-11:00, Thu., 19 Mar. 0.0309 0.0266 0.0288
09:01-10:00, Thu., 19 Mar. 0.0307 0.0263 0.0285
08:01-09:00, Thu., 19 Mar. 0.0304 0.0270 0.0286
07:01-08:00, Thu., 19 Mar. 0.0308 0.0274 0.0290
06:01-07:00, Thu., 19 Mar. 0.0324 0.0273 0.0296
05:01-06:00, Thu., 19 Mar. 0.0330 0.0273 0.0298
04:01-05:00, Thu., 19 Mar. 0.0304 0.0252 0.0283
03:01-04:00, Thu., 19 Mar. 0.0298 0.0262 0.0283
02:01-03:00, Thu., 19 Mar. 0.0299 0.0268 0.0283
01:01-02:00, Thu., 19 Mar. 0.0308 0.0259 0.0280
00:01-01:00, Thu., 19 Mar. 0.0294 0.0255 0.0280
23:01-24:00, Wed., 18 Mar. 0.0309 0.0254 0.0278
22:01-23:00, Wed., 18 Mar. 0.0300 0.0256 0.0277
21:01-22:00, Wed., 18 Mar. 0.0300 0.0259 0.0277
20:01-21:00, Wed., 18 Mar. 0.0298 0.0254 0.0276
19:01-20:00, Wed., 18 Mar. 0.0299 0.0256 0.0275
18:01-19:00, Wed., 18 Mar. 0.0294 0.0248 0.0273
17:01-18:00, Wed., 18 Mar. 0.0295 0.0260 0.0275
16:01-17:00, Wed., 18 Mar. 0.0291 0.0259 0.0277
15:01-16:00, Wed., 18 Mar. 0.0308 0.0253 0.0276
14:01-15:00, Wed., 18 Mar. 0.0296 0.0257 0.0276
13:01-14:00, Wed., 18 Mar. 0.0297 0.0256 0.0276
12:01-13:00, Wed., 18 Mar. 0.0300 0.0249 0.0277
11:01-12:00, Wed., 18 Mar. 0.0301 0.0262 0.0279
10:01-11:00, Wed., 18 Mar. 0.0303 0.0260 0.0282
09:01-10:00, Wed., 18 Mar. 0.0300 0.0263 0.0283
08:01-09:00, Wed., 18 Mar. 0.0301 0.0266 0.0281
07:01-08:00, Wed., 18 Mar. 0.0318 0.0267 0.0283
06:01-07:00, Wed., 18 Mar. 0.0315 0.0266 0.0289
05:01-06:00, Wed., 18 Mar. 0.0319 0.0268 0.0298
04:01-05:00, Wed., 18 Mar. 0.0323 0.0279 0.0301
03:01-04:00, Wed., 18 Mar. 0.0325 0.0256 0.0292
02:01-03:00, Wed., 18 Mar. 0.0304 0.0266 0.0286
01:01-02:00, Wed., 18 Mar. 0.0299 0.0256 0.0279
00:01-01:00, Wed., 18 Mar. 0.0306 0.0260 0.0275
23:01-24:00, Tue., 17 Mar. 0.0304 0.0249 0.0276
22:01-23:00, Tue., 17 Mar. 0.0308 0.0254 0.0277
21:01-22:00, Tue., 17 Mar. 0.0297 0.0252 0.0277
20:01-21:00, Tue., 17 Mar. 0.0297 0.0259 0.0276
19:01-20:00, Tue., 17 Mar. 0.0300 0.0257 0.0279
18:01-19:00, Tue., 17 Mar. 0.0295 0.0261 0.0276
17:01-18:00, Tue., 17 Mar. 0.0303 0.0253 0.0279
16:01-17:00, Tue., 17 Mar. 0.0295 0.0259 0.0278
15:01-16:00, Tue., 17 Mar. 0.0295 0.0250 0.0280
14:01-15:00, Tue., 17 Mar. 0.0298 0.0257 0.0278
13:01-14:00, Tue., 17 Mar. 0.0298 0.0257 0.0279
12:01-13:00, Tue., 17 Mar. 0.0301 0.0262 0.0281
11:01-12:00, Tue., 17 Mar. 0.0295 0.0258 0.0279