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., 26 Apr. 0.0299 0.0255 0.0279
09:01-10:00, Fri., 26 Apr. 0.0308 0.0253 0.0279
08:01-09:00, Fri., 26 Apr. 0.0305 0.0258 0.0281
07:01-08:00, Fri., 26 Apr. 0.0303 0.0256 0.0280
06:01-07:00, Fri., 26 Apr. 0.0301 0.0254 0.0282
05:01-06:00, Fri., 26 Apr. 0.0303 0.0251 0.0277
04:01-05:00, Fri., 26 Apr. 0.0298 0.0254 0.0274
03:01-04:00, Fri., 26 Apr. 0.0293 0.0259 0.0277
02:01-03:00, Fri., 26 Apr. 0.0304 0.0256 0.0279
01:01-02:00, Fri., 26 Apr. 0.0308 0.0259 0.0281
00:01-01:00, Fri., 26 Apr. 0.0297 0.0259 0.0278
23:01-24:00, Thu., 25 Apr. 0.0297 0.0252 0.0277
22:01-23:00, Thu., 25 Apr. 0.0298 0.0257 0.0277
21:01-22:00, Thu., 25 Apr. 0.0296 0.0260 0.0279
20:01-21:00, Thu., 25 Apr. 0.0298 0.0256 0.0277
19:01-20:00, Thu., 25 Apr. 0.0295 0.0249 0.0274
18:01-19:00, Thu., 25 Apr. 0.0300 0.0247 0.0274
17:01-18:00, Thu., 25 Apr. 0.0309 0.0256 0.0277
16:01-17:00, Thu., 25 Apr. 0.0299 0.0253 0.0275
15:01-16:00, Thu., 25 Apr. 0.0298 0.0249 0.0278
14:01-15:00, Thu., 25 Apr. 0.0306 0.0261 0.0276
13:01-14:00, Thu., 25 Apr. 0.0294 0.0251 0.0274
12:01-13:00, Thu., 25 Apr. 0.0295 0.0248 0.0274
11:01-12:00, Thu., 25 Apr. 0.0291 0.0254 0.0274
10:01-11:00, Thu., 25 Apr. 0.0298 0.0259 0.0276
09:01-10:00, Thu., 25 Apr. 0.0293 0.0257 0.0275
08:01-09:00, Thu., 25 Apr. 0.0297 0.0256 0.0274
07:01-08:00, Thu., 25 Apr. 0.0295 0.0256 0.0278
06:01-07:00, Thu., 25 Apr. 0.0296 0.0257 0.0276
05:01-06:00, Thu., 25 Apr. 0.0298 0.0249 0.0271
04:01-05:00, Thu., 25 Apr. 0.0290 0.0253 0.0270
03:01-04:00, Thu., 25 Apr. 0.0289 0.0249 0.0269
02:01-03:00, Thu., 25 Apr. 0.0298 0.0256 0.0271
01:01-02:00, Thu., 25 Apr. 0.0310 0.0257 0.0278
00:01-01:00, Thu., 25 Apr. 0.0315 0.0277 0.0295
23:01-24:00, Wed., 24 Apr. 0.0348 0.0286 0.0320
22:01-23:00, Wed., 24 Apr. 0.0356 0.0315 0.0333
21:01-22:00, Wed., 24 Apr. 0.0353 0.0311 0.0336
20:01-21:00, Wed., 24 Apr. 0.0360 0.0307 0.0334
19:01-20:00, Wed., 24 Apr. 0.0349 0.0298 0.0321
18:01-19:00, Wed., 24 Apr. 0.0328 0.0291 0.0310
17:01-18:00, Wed., 24 Apr. 0.0325 0.0282 0.0303
16:01-17:00, Wed., 24 Apr. 0.0332 0.0287 0.0310
15:01-16:00, Wed., 24 Apr. 0.0330 0.0281 0.0306
14:01-15:00, Wed., 24 Apr. 0.0332 0.0282 0.0307
13:01-14:00, Wed., 24 Apr. 0.0363 0.0303 0.0332
12:01-13:00, Wed., 24 Apr. 0.0354 0.0297 0.0325
11:01-12:00, Wed., 24 Apr. 0.0335 0.0270 0.0297
10:01-11:00, Wed., 24 Apr. 0.0307 0.0266 0.0283
09:01-10:00, Wed., 24 Apr. 0.0320 0.0271 0.0291
08:01-09:00, Wed., 24 Apr. 0.0316 0.0255 0.0289
07:01-08:00, Wed., 24 Apr. 0.0363 0.0288 0.0323
06:01-07:00, Wed., 24 Apr. 0.0398 0.0334 0.0366
05:01-06:00, Wed., 24 Apr. 0.0368 0.0315 0.0337
04:01-05:00, Wed., 24 Apr. 0.0339 0.0268 0.0302
03:01-04:00, Wed., 24 Apr. 0.0290 0.0252 0.0272
02:01-03:00, Wed., 24 Apr. 0.0290 0.0256 0.0273
01:01-02:00, Wed., 24 Apr. 0.0294 0.0252 0.0273
00:01-01:00, Wed., 24 Apr. 0.0297 0.0256 0.0275
23:01-24:00, Tue., 23 Apr. 0.0293 0.0258 0.0273
22:01-23:00, Tue., 23 Apr. 0.0296 0.0252 0.0272
21:01-22:00, Tue., 23 Apr. 0.0298 0.0251 0.0275
20:01-21:00, Tue., 23 Apr. 0.0298 0.0257 0.0277
19:01-20:00, Tue., 23 Apr. 0.0308 0.0266 0.0286
18:01-19:00, Tue., 23 Apr. 0.0331 0.0280 0.0302
17:01-18:00, Tue., 23 Apr. 0.0322 0.0273 0.0297
16:01-17:00, Tue., 23 Apr. 0.0304 0.0248 0.0276
15:01-16:00, Tue., 23 Apr. 0.0305 0.0255 0.0278
14:01-15:00, Tue., 23 Apr. 0.0301 0.0261 0.0277
13:01-14:00, Tue., 23 Apr. 0.0299 0.0260 0.0277
12:01-13:00, Tue., 23 Apr. 0.0304 0.0257 0.0283
11:01-12:00, Tue., 23 Apr. 0.0298 0.0255 0.0275
10:01-11:00, Tue., 23 Apr. 0.0304 0.0246 0.0275
09:01-10:00, Tue., 23 Apr. 0.0300 0.0260 0.0276
08:01-09:00, Tue., 23 Apr. 0.0293 0.0256 0.0278
07:01-08:00, Tue., 23 Apr. 0.0307 0.0259 0.0280
06:01-07:00, Tue., 23 Apr. 0.0303 0.0263 0.0283
05:01-06:00, Tue., 23 Apr. 0.0314 0.0263 0.0280
04:01-05:00, Tue., 23 Apr. 0.0295 0.0258 0.0277
03:01-04:00, Tue., 23 Apr. 0.0301 0.0252 0.0279
02:01-03:00, Tue., 23 Apr. 0.0303 0.0262 0.0278
01:01-02:00, Tue., 23 Apr. 0.0298 0.0256 0.0277
00:01-01:00, Tue., 23 Apr. 0.0298 0.0257 0.0278
23:01-24:00, Mon., 22 Apr. 0.0298 0.0262 0.0277
22:01-23:00, Mon., 22 Apr. 0.0305 0.0257 0.0274
21:01-22:00, Mon., 22 Apr. 0.0297 0.0259 0.0275
20:01-21:00, Mon., 22 Apr. 0.0299 0.0257 0.0277
19:01-20:00, Mon., 22 Apr. 0.0295 0.0256 0.0278
18:01-19:00, Mon., 22 Apr. 0.0298 0.0257 0.0278
17:01-18:00, Mon., 22 Apr. 0.0299 0.0259 0.0276
16:01-17:00, Mon., 22 Apr. 0.0295 0.0258 0.0276
15:01-16:00, Mon., 22 Apr. 0.0302 0.0256 0.0278
14:01-15:00, Mon., 22 Apr. 0.0295 0.0259 0.0278
13:01-14:00, Mon., 22 Apr. 0.0300 0.0262 0.0279
12:01-13:00, Mon., 22 Apr. 0.0302 0.0260 0.0279
11:01-12:00, Mon., 22 Apr. 0.0301 0.0256 0.0282
10:01-11:00, Mon., 22 Apr. 0.0317 0.0265 0.0292
09:01-10:00, Mon., 22 Apr. 0.0335 0.0288 0.0309
08:01-09:00, Mon., 22 Apr. 0.0368 0.0301 0.0333
07:01-08:00, Mon., 22 Apr. 0.0360 0.0301 0.0331
06:01-07:00, Mon., 22 Apr. 0.0352 0.0297 0.0322
05:01-06:00, Mon., 22 Apr. 0.0399 0.0313 0.0352
04:01-05:00, Mon., 22 Apr. 0.0417 0.0346 0.0383
03:01-04:00, Mon., 22 Apr. 0.0438 0.0371 0.0398
02:01-03:00, Mon., 22 Apr. 0.0411 0.0363 0.0388
01:01-02:00, Mon., 22 Apr. 0.0427 0.0370 0.0401
00:01-01:00, Mon., 22 Apr. 0.0450 0.0381 0.0420
23:01-24:00, Sun., 21 Apr. 0.0445 0.0397 0.0420
22:01-23:00, Sun., 21 Apr. 0.0436 0.0375 0.0410
21:01-22:00, Sun., 21 Apr. 0.0423 0.0373 0.0399
20:01-21:00, Sun., 21 Apr. 0.0421 0.0371 0.0394
19:01-20:00, Sun., 21 Apr. 0.0419 0.0336 0.0378
18:01-19:00, Sun., 21 Apr. 0.0386 0.0282 0.0323
17:01-18:00, Sun., 21 Apr. 0.0308 0.0268 0.0289
16:01-17:00, Sun., 21 Apr. 0.0311 0.0265 0.0290
15:01-16:00, Sun., 21 Apr. 0.0323 0.0271 0.0293
14:01-15:00, Sun., 21 Apr. 0.0315 0.0275 0.0293
13:01-14:00, Sun., 21 Apr. 0.0307 0.0266 0.0286
12:01-13:00, Sun., 21 Apr. 0.0312 0.0263 0.0286
11:01-12:00, Sun., 21 Apr. 0.0304 0.0271 0.0286
10:01-11:00, Sun., 21 Apr. 0.0320 0.0268 0.0288
09:01-10:00, Sun., 21 Apr. 0.0310 0.0265 0.0289
08:01-09:00, Sun., 21 Apr. 0.0308 0.0270 0.0289
07:01-08:00, Sun., 21 Apr. 0.0311 0.0263 0.0290
06:01-07:00, Sun., 21 Apr. 0.0305 0.0266 0.0287
05:01-06:00, Sun., 21 Apr. 0.0310 0.0257 0.0288
04:01-05:00, Sun., 21 Apr. 0.0315 0.0265 0.0290
03:01-04:00, Sun., 21 Apr. 0.0308 0.0266 0.0288
02:01-03:00, Sun., 21 Apr. 0.0302 0.0268 0.0288
01:01-02:00, Sun., 21 Apr. 0.0312 0.0265 0.0290
00:01-01:00, Sun., 21 Apr. 0.0314 0.0273 0.0292
23:01-24:00, Sat., 20 Apr. 0.0315 0.0270 0.0289
22:01-23:00, Sat., 20 Apr. 0.0308 0.0270 0.0287
21:01-22:00, Sat., 20 Apr. 0.0304 0.0273 0.0290
20:01-21:00, Sat., 20 Apr. 0.0305 0.0266 0.0290
19:01-20:00, Sat., 20 Apr. 0.0315 0.0266 0.0288
18:01-19:00, Sat., 20 Apr. 0.0315 0.0263 0.0287
17:01-18:00, Sat., 20 Apr. 0.0308 0.0268 0.0288
16:01-17:00, Sat., 20 Apr. 0.0310 0.0266 0.0289
15:01-16:00, Sat., 20 Apr. 0.0308 0.0269 0.0290
14:01-15:00, Sat., 20 Apr. 0.0317 0.0271 0.0294
13:01-14:00, Sat., 20 Apr. 0.0308 0.0269 0.0288
12:01-13:00, Sat., 20 Apr. 0.0311 0.0273 0.0292
11:01-12:00, Sat., 20 Apr. 0.0320 0.0271 0.0291
10:01-11:00, Sat., 20 Apr. 0.0311 0.0277 0.0291
09:01-10:00, Sat., 20 Apr. 0.0305 0.0265 0.0290
08:01-09:00, Sat., 20 Apr. 0.0312 0.0274 0.0291
07:01-08:00, Sat., 20 Apr. 0.0331 0.0280 0.0300
06:01-07:00, Sat., 20 Apr. 0.0312 0.0279 0.0299
05:01-06:00, Sat., 20 Apr. 0.0311 0.0276 0.0294
04:01-05:00, Sat., 20 Apr. 0.0317 0.0272 0.0294
03:01-04:00, Sat., 20 Apr. 0.0323 0.0271 0.0296
02:01-03:00, Sat., 20 Apr. 0.0318 0.0278 0.0298
01:01-02:00, Sat., 20 Apr. 0.0316 0.0279 0.0295
00:01-01:00, Sat., 20 Apr. 0.0316 0.0274 0.0290
23:01-24:00, Fri., 19 Apr. 0.0311 0.0265 0.0284
22:01-23:00, Fri., 19 Apr. 0.0302 0.0267 0.0285
21:01-22:00, Fri., 19 Apr. 0.0307 0.0270 0.0284
20:01-21:00, Fri., 19 Apr. 0.0313 0.0270 0.0288
19:01-20:00, Fri., 19 Apr. 0.0308 0.0257 0.0288
18:01-19:00, Fri., 19 Apr. 0.0302 0.0262 0.0287
17:01-18:00, Fri., 19 Apr. 0.0310 0.0273 0.0289
16:01-17:00, Fri., 19 Apr. 0.0318 0.0273 0.0289
15:01-16:00, Fri., 19 Apr. 0.0314 0.0268 0.0291
14:01-15:00, Fri., 19 Apr. 0.0318 0.0272 0.0291
13:01-14:00, Fri., 19 Apr. 0.0309 0.0264 0.0290
12:01-13:00, Fri., 19 Apr. 0.0315 0.0268 0.0291
11:01-12:00, Fri., 19 Apr. 0.0308 0.0270 0.0291
10:01-11:00, Fri., 19 Apr. 0.0310 0.0270 0.0289
09:01-10:00, Fri., 19 Apr. 0.0308 0.0273 0.0290
08:01-09:00, Fri., 19 Apr. 0.0310 0.0274 0.0290
07:01-08:00, Fri., 19 Apr. 0.0318 0.0269 0.0289
06:01-07:00, Fri., 19 Apr. 0.0310 0.0261 0.0286
05:01-06:00, Fri., 19 Apr. 0.0316 0.0265 0.0291
04:01-05:00, Fri., 19 Apr. 0.0315 0.0269 0.0294
03:01-04:00, Fri., 19 Apr. 0.0332 0.0280 0.0301
02:01-03:00, Fri., 19 Apr. 0.0336 0.0281 0.0310
01:01-02:00, Fri., 19 Apr. 0.0321 0.0277 0.0295
00:01-01:00, Fri., 19 Apr. 0.0344 0.0279 0.0310
23:01-24:00, Thu., 18 Apr. 0.0402 0.0328 0.0357
22:01-23:00, Thu., 18 Apr. 0.0422 0.0333 0.0376
21:01-22:00, Thu., 18 Apr. 0.0424 0.0317 0.0370
20:01-21:00, Thu., 18 Apr. 0.0343 0.0287 0.0319
19:01-20:00, Thu., 18 Apr. 0.0340 0.0280 0.0314
18:01-19:00, Thu., 18 Apr. 0.0317 0.0278 0.0296
17:01-18:00, Thu., 18 Apr. 0.0319 0.0270 0.0295
16:01-17:00, Thu., 18 Apr. 0.0313 0.0273 0.0291
15:01-16:00, Thu., 18 Apr. 0.0315 0.0273 0.0290
14:01-15:00, Thu., 18 Apr. 0.0318 0.0269 0.0290
13:01-14:00, Thu., 18 Apr. 0.0308 0.0268 0.0288
12:01-13:00, Thu., 18 Apr. 0.0318 0.0259 0.0289
11:01-12:00, Thu., 18 Apr. 0.0310 0.0266 0.0288
10:01-11:00, Thu., 18 Apr. 0.0323 0.0273 0.0292
09:01-10:00, Thu., 18 Apr. 0.0315 0.0256 0.0288
08:01-09:00, Thu., 18 Apr. 0.0311 0.0273 0.0290
07:01-08:00, Thu., 18 Apr. 0.0315 0.0270 0.0291
06:01-07:00, Thu., 18 Apr. 0.0308 0.0263 0.0289
05:01-06:00, Thu., 18 Apr. 0.0309 0.0275 0.0288
04:01-05:00, Thu., 18 Apr. 0.0309 0.0266 0.0286
03:01-04:00, Thu., 18 Apr. 0.0310 0.0260 0.0288
02:01-03:00, Thu., 18 Apr. 0.0307 0.0267 0.0288
01:01-02:00, Thu., 18 Apr. 0.0307 0.0270 0.0287
00:01-01:00, Thu., 18 Apr. 0.0308 0.0259 0.0286
23:01-24:00, Wed., 17 Apr. 0.0301 0.0263 0.0285
22:01-23:00, Wed., 17 Apr. 0.0302 0.0261 0.0282
21:01-22:00, Wed., 17 Apr. 0.0318 0.0266 0.0284
20:01-21:00, Wed., 17 Apr. 0.0301 0.0261 0.0282
19:01-20:00, Wed., 17 Apr. 0.0301 0.0253 0.0281
18:01-19:00, Wed., 17 Apr. 0.0306 0.0265 0.0282
17:01-18:00, Wed., 17 Apr. 0.0311 0.0258 0.0282
16:01-17:00, Wed., 17 Apr. 0.0309 0.0261 0.0286
15:01-16:00, Wed., 17 Apr. 0.0305 0.0256 0.0282
14:01-15:00, Wed., 17 Apr. 0.0302 0.0262 0.0281
13:01-14:00, Wed., 17 Apr. 0.0300 0.0261 0.0282
12:01-13:00, Wed., 17 Apr. 0.0302 0.0264 0.0283
11:01-12:00, Wed., 17 Apr. 0.0306 0.0264 0.0280
10:01-11:00, Wed., 17 Apr. 0.0309 0.0260 0.0281
09:01-10:00, Wed., 17 Apr. 0.0301 0.0262 0.0281
08:01-09:00, Wed., 17 Apr. 0.0305 0.0259 0.0282
07:01-08:00, Wed., 17 Apr. 0.0303 0.0264 0.0284
06:01-07:00, Wed., 17 Apr. 0.0311 0.0271 0.0289
05:01-06:00, Wed., 17 Apr. 0.0301 0.0258 0.0281
04:01-05:00, Wed., 17 Apr. 0.0317 0.0259 0.0283
03:01-04:00, Wed., 17 Apr. 0.0321 0.0276 0.0291
02:01-03:00, Wed., 17 Apr. 0.0321 0.0269 0.0292
01:01-02:00, Wed., 17 Apr. 0.0301 0.0262 0.0282
00:01-01:00, Wed., 17 Apr. 0.0304 0.0262 0.0280
23:01-24:00, Tue., 16 Apr. 0.0297 0.0258 0.0280
22:01-23:00, Tue., 16 Apr. 0.0304 0.0258 0.0279
21:01-22:00, Tue., 16 Apr. 0.0299 0.0264 0.0280
20:01-21:00, Tue., 16 Apr. 0.0301 0.0256 0.0278
19:01-20:00, Tue., 16 Apr. 0.0305 0.0252 0.0277
18:01-19:00, Tue., 16 Apr. 0.0302 0.0257 0.0279
17:01-18:00, Tue., 16 Apr. 0.0304 0.0254 0.0277
16:01-17:00, Tue., 16 Apr. 0.0311 0.0259 0.0279
15:01-16:00, Tue., 16 Apr. 0.0295 0.0252 0.0277
14:01-15:00, Tue., 16 Apr. 0.0310 0.0261 0.0281
13:01-14:00, Tue., 16 Apr. 0.0304 0.0257 0.0279
12:01-13:00, Tue., 16 Apr. 0.0311 0.0259 0.0279
11:01-12:00, Tue., 16 Apr. 0.0307 0.0252 0.0278