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
03:01-04:00, Sat., 07 Nov. 0.0226 0.0185 0.0201
02:01-03:00, Sat., 07 Nov. 0.0223 0.0190 0.0204
01:01-02:00, Sat., 07 Nov. 0.0217 0.0183 0.0204
00:01-01:00, Sat., 07 Nov. 0.0224 0.0187 0.0202
23:01-24:00, Fri., 06 Nov. 0.0217 0.0179 0.0201
22:01-23:00, Fri., 06 Nov. 0.0221 0.0181 0.0200
21:01-22:00, Fri., 06 Nov. 0.0220 0.0183 0.0202
20:01-21:00, Fri., 06 Nov. 0.0221 0.0183 0.0200
19:01-20:00, Fri., 06 Nov. 0.0221 0.0179 0.0199
18:01-19:00, Fri., 06 Nov. 0.0214 0.0183 0.0200
17:01-18:00, Fri., 06 Nov. 0.0217 0.0184 0.0201
16:01-17:00, Fri., 06 Nov. 0.0216 0.0185 0.0201
15:01-16:00, Fri., 06 Nov. 0.0221 0.0180 0.0201
14:01-15:00, Fri., 06 Nov. 0.0220 0.0186 0.0202
13:01-14:00, Fri., 06 Nov. 0.0218 0.0186 0.0201
12:01-13:00, Fri., 06 Nov. 0.0217 0.0183 0.0202
11:01-12:00, Fri., 06 Nov. 0.0224 0.0188 0.0204
10:01-11:00, Fri., 06 Nov. 0.0226 0.0190 0.0204
09:01-10:00, Fri., 06 Nov. 0.0223 0.0183 0.0204
08:01-09:00, Fri., 06 Nov. 0.0217 0.0191 0.0204
07:01-08:00, Fri., 06 Nov. 0.0217 0.0186 0.0204
06:01-07:00, Fri., 06 Nov. 0.0226 0.0184 0.0206
05:01-06:00, Fri., 06 Nov. 0.0223 0.0186 0.0206
04:01-05:00, Fri., 06 Nov. 0.0219 0.0183 0.0204
03:01-04:00, Fri., 06 Nov. 0.0221 0.0190 0.0206
02:01-03:00, Fri., 06 Nov. 0.0220 0.0186 0.0206
01:01-02:00, Fri., 06 Nov. 0.0219 0.0183 0.0204
00:01-01:00, Fri., 06 Nov. 0.0222 0.0180 0.0202
23:01-24:00, Thu., 05 Nov. 0.0215 0.0181 0.0199
22:01-23:00, Thu., 05 Nov. 0.0221 0.0185 0.0198
21:01-22:00, Thu., 05 Nov. 0.0214 0.0183 0.0197
20:01-21:00, Thu., 05 Nov. 0.0218 0.0186 0.0199
19:01-20:00, Thu., 05 Nov. 0.0215 0.0184 0.0199
18:01-19:00, Thu., 05 Nov. 0.0221 0.0179 0.0202
17:01-18:00, Thu., 05 Nov. 0.0215 0.0179 0.0196
16:01-17:00, Thu., 05 Nov. 0.0210 0.0176 0.0197
15:01-16:00, Thu., 05 Nov. 0.0213 0.0179 0.0196
14:01-15:00, Thu., 05 Nov. 0.0221 0.0183 0.0199
13:01-14:00, Thu., 05 Nov. 0.0219 0.0192 0.0206
12:01-13:00, Thu., 05 Nov. 0.0228 0.0187 0.0207
11:01-12:00, Thu., 05 Nov. 0.0231 0.0190 0.0207
10:01-11:00, Thu., 05 Nov. 0.0252 0.0200 0.0220
09:01-10:00, Thu., 05 Nov. 0.0252 0.0214 0.0234
08:01-09:00, Thu., 05 Nov. 0.0266 0.0221 0.0247
07:01-08:00, Thu., 05 Nov. 0.0308 0.0242 0.0269
06:01-07:00, Thu., 05 Nov. 0.0343 0.0273 0.0311
05:01-06:00, Thu., 05 Nov. 0.0374 0.0324 0.0350
04:01-05:00, Thu., 05 Nov. 0.0374 0.0327 0.0356
03:01-04:00, Thu., 05 Nov. 0.0392 0.0334 0.0357
02:01-03:00, Thu., 05 Nov. 0.0410 0.0337 0.0373
01:01-02:00, Thu., 05 Nov. 0.0353 0.0298 0.0327
00:01-01:00, Thu., 05 Nov. 0.0367 0.0307 0.0336
23:01-24:00, Wed., 04 Nov. 0.0377 0.0307 0.0342
22:01-23:00, Wed., 04 Nov. 0.0377 0.0323 0.0347
21:01-22:00, Wed., 04 Nov. 0.0388 0.0349 0.0365
20:01-21:00, Wed., 04 Nov. 0.0384 0.0327 0.0357
19:01-20:00, Wed., 04 Nov. 0.0353 0.0310 0.0331
18:01-19:00, Wed., 04 Nov. 0.0339 0.0289 0.0313
17:01-18:00, Wed., 04 Nov. 0.0325 0.0277 0.0302
16:01-17:00, Wed., 04 Nov. 0.0300 0.0259 0.0279
15:01-16:00, Wed., 04 Nov. 0.0303 0.0261 0.0286
14:01-15:00, Wed., 04 Nov. 0.0326 0.0266 0.0285
13:01-14:00, Wed., 04 Nov. 0.0310 0.0213 0.0265
12:01-13:00, Wed., 04 Nov. 0.0249 0.0194 0.0221
11:01-12:00, Wed., 04 Nov. 0.0231 0.0188 0.0211
10:01-11:00, Wed., 04 Nov. 0.0234 0.0191 0.0210
09:01-10:00, Wed., 04 Nov. 0.0235 0.0192 0.0211
08:01-09:00, Wed., 04 Nov. 0.0225 0.0193 0.0208
07:01-08:00, Wed., 04 Nov. 0.0225 0.0181 0.0205
06:01-07:00, Wed., 04 Nov. 0.0228 0.0191 0.0205
05:01-06:00, Wed., 04 Nov. 0.0221 0.0191 0.0206
04:01-05:00, Wed., 04 Nov. 0.0232 0.0180 0.0206
03:01-04:00, Wed., 04 Nov. 0.0224 0.0190 0.0204
02:01-03:00, Wed., 04 Nov. 0.0222 0.0187 0.0204
01:01-02:00, Wed., 04 Nov. 0.0222 0.0185 0.0202
00:01-01:00, Wed., 04 Nov. 0.0228 0.0189 0.0204
23:01-24:00, Tue., 03 Nov. 0.0221 0.0190 0.0203
22:01-23:00, Tue., 03 Nov. 0.0221 0.0181 0.0203
21:01-22:00, Tue., 03 Nov. 0.0221 0.0174 0.0202
20:01-21:00, Tue., 03 Nov. 0.0225 0.0182 0.0203
19:01-20:00, Tue., 03 Nov. 0.0223 0.0186 0.0206
18:01-19:00, Tue., 03 Nov. 0.0222 0.0186 0.0203
17:01-18:00, Tue., 03 Nov. 0.0220 0.0191 0.0203
16:01-17:00, Tue., 03 Nov. 0.0225 0.0184 0.0205
15:01-16:00, Tue., 03 Nov. 0.0237 0.0193 0.0206
14:01-15:00, Tue., 03 Nov. 0.0225 0.0191 0.0205
13:01-14:00, Tue., 03 Nov. 0.0221 0.0186 0.0205
12:01-13:00, Tue., 03 Nov. 0.0223 0.0182 0.0207
11:01-12:00, Tue., 03 Nov. 0.0222 0.0186 0.0207
10:01-11:00, Tue., 03 Nov. 0.0228 0.0193 0.0206
09:01-10:00, Tue., 03 Nov. 0.0227 0.0188 0.0205
08:01-09:00, Tue., 03 Nov. 0.0234 0.0190 0.0211
07:01-08:00, Tue., 03 Nov. 0.0227 0.0189 0.0209
06:01-07:00, Tue., 03 Nov. 0.0229 0.0195 0.0209
05:01-06:00, Tue., 03 Nov. 0.0230 0.0193 0.0209
04:01-05:00, Tue., 03 Nov. 0.0235 0.0191 0.0211
03:01-04:00, Tue., 03 Nov. 0.0231 0.0186 0.0211
02:01-03:00, Tue., 03 Nov. 0.0227 0.0189 0.0209
01:01-02:00, Tue., 03 Nov. 0.0229 0.0196 0.0211
00:01-01:00, Tue., 03 Nov. 0.0224 0.0191 0.0208
23:01-24:00, Mon., 02 Nov. 0.0220 0.0184 0.0205
22:01-23:00, Mon., 02 Nov. 0.0217 0.0187 0.0204
21:01-22:00, Mon., 02 Nov. 0.0232 0.0193 0.0207
20:01-21:00, Mon., 02 Nov. 0.0242 0.0183 0.0215
19:01-20:00, Mon., 02 Nov. 0.0295 0.0222 0.0250
18:01-19:00, Mon., 02 Nov. 0.0465 0.0270 0.0360
17:01-18:00, Mon., 02 Nov. 0.0468 0.0393 0.0427
16:01-17:00, Mon., 02 Nov. 0.0430 0.0349 0.0386
15:01-16:00, Mon., 02 Nov. 0.0357 0.0290 0.0324
14:01-15:00, Mon., 02 Nov. 0.0310 0.0225 0.0265
13:01-14:00, Mon., 02 Nov. 0.0248 0.0199 0.0225
12:01-13:00, Mon., 02 Nov. 0.0235 0.0198 0.0217
11:01-12:00, Mon., 02 Nov. 0.0235 0.0203 0.0216
10:01-11:00, Mon., 02 Nov. 0.0235 0.0197 0.0212
09:01-10:00, Mon., 02 Nov. 0.0230 0.0194 0.0214
08:01-09:00, Mon., 02 Nov. 0.0238 0.0207 0.0219
07:01-08:00, Mon., 02 Nov. 0.0234 0.0206 0.0219
06:01-07:00, Mon., 02 Nov. 0.0237 0.0199 0.0213
05:01-06:00, Mon., 02 Nov. 0.0225 0.0196 0.0212
04:01-05:00, Mon., 02 Nov. 0.0230 0.0193 0.0213
03:01-04:00, Mon., 02 Nov. 0.0230 0.0199 0.0213
02:01-03:00, Mon., 02 Nov. 0.0231 0.0199 0.0211
01:01-02:00, Mon., 02 Nov. 0.0225 0.0190 0.0209
00:01-01:00, Mon., 02 Nov. 0.0226 0.0190 0.0210
23:01-24:00, Sun., 01 Nov. 0.0228 0.0187 0.0208
22:01-23:00, Sun., 01 Nov. 0.0221 0.0190 0.0206
21:01-22:00, Sun., 01 Nov. 0.0225 0.0190 0.0207
20:01-21:00, Sun., 01 Nov. 0.0222 0.0190 0.0204
19:01-20:00, Sun., 01 Nov. 0.0224 0.0193 0.0206
18:01-19:00, Sun., 01 Nov. 0.0230 0.0190 0.0207
17:01-18:00, Sun., 01 Nov. 0.0219 0.0192 0.0205
16:01-17:00, Sun., 01 Nov. 0.0224 0.0185 0.0206
15:01-16:00, Sun., 01 Nov. 0.0219 0.0186 0.0205
14:01-15:00, Sun., 01 Nov. 0.0224 0.0188 0.0205
13:01-14:00, Sun., 01 Nov. 0.0224 0.0189 0.0206
12:01-13:00, Sun., 01 Nov. 0.0226 0.0189 0.0206
11:01-12:00, Sun., 01 Nov. 0.0225 0.0191 0.0207
10:01-11:00, Sun., 01 Nov. 0.0225 0.0190 0.0206
09:01-10:00, Sun., 01 Nov. 0.0224 0.0190 0.0207
08:01-09:00, Sun., 01 Nov. 0.0230 0.0188 0.0213
07:01-08:00, Sun., 01 Nov. 0.0233 0.0199 0.0217
06:01-07:00, Sun., 01 Nov. 0.0232 0.0191 0.0213
05:01-06:00, Sun., 01 Nov. 0.0230 0.0200 0.0213
04:01-05:00, Sun., 01 Nov. 0.0231 0.0193 0.0211
03:01-04:00, Sun., 01 Nov. 0.0221 0.0188 0.0205
02:01-03:00, Sun., 01 Nov. 0.0221 0.0174 0.0204
01:01-02:00, Sun., 01 Nov. 0.0222 0.0188 0.0202
00:01-01:00, Sun., 01 Nov. 0.0228 0.0189 0.0205
23:01-24:00, Sat., 31 Oct. 0.0224 0.0190 0.0207
22:01-23:00, Sat., 31 Oct. 0.0217 0.0185 0.0204
21:01-22:00, Sat., 31 Oct. 0.0224 0.0186 0.0204
20:01-21:00, Sat., 31 Oct. 0.0224 0.0193 0.0205
19:01-20:00, Sat., 31 Oct. 0.0223 0.0185 0.0203
18:01-19:00, Sat., 31 Oct. 0.0220 0.0186 0.0203
17:01-18:00, Sat., 31 Oct. 0.0225 0.0190 0.0205
16:01-17:00, Sat., 31 Oct. 0.0217 0.0179 0.0203
15:01-16:00, Sat., 31 Oct. 0.0221 0.0187 0.0202
14:01-15:00, Sat., 31 Oct. 0.0222 0.0186 0.0203
13:01-14:00, Sat., 31 Oct. 0.0222 0.0186 0.0206
12:01-13:00, Sat., 31 Oct. 0.0226 0.0189 0.0207
11:01-12:00, Sat., 31 Oct. 0.0235 0.0191 0.0207
10:01-11:00, Sat., 31 Oct. 0.0228 0.0191 0.0211
09:01-10:00, Sat., 31 Oct. 0.0230 0.0193 0.0210
08:01-09:00, Sat., 31 Oct. 0.0236 0.0200 0.0218
07:01-08:00, Sat., 31 Oct. 0.0240 0.0199 0.0220
06:01-07:00, Sat., 31 Oct. 0.0231 0.0196 0.0218
05:01-06:00, Sat., 31 Oct. 0.0237 0.0199 0.0217
04:01-05:00, Sat., 31 Oct. 0.0231 0.0196 0.0214
03:01-04:00, Sat., 31 Oct. 0.0231 0.0199 0.0215
02:01-03:00, Sat., 31 Oct. 0.0230 0.0195 0.0212
01:01-02:00, Sat., 31 Oct. 0.0236 0.0197 0.0214
00:01-01:00, Sat., 31 Oct. 0.0237 0.0195 0.0216
23:01-24:00, Fri., 30 Oct. 0.0246 0.0210 0.0224
22:01-23:00, Fri., 30 Oct. 0.0235 0.0193 0.0217
21:01-22:00, Fri., 30 Oct. 0.0231 0.0189 0.0211
20:01-21:00, Fri., 30 Oct. 0.0231 0.0196 0.0210
19:01-20:00, Fri., 30 Oct. 0.0227 0.0192 0.0210
18:01-19:00, Fri., 30 Oct. 0.0228 0.0189 0.0210
17:01-18:00, Fri., 30 Oct. 0.0228 0.0192 0.0211
16:01-17:00, Fri., 30 Oct. 0.0229 0.0199 0.0211
15:01-16:00, Fri., 30 Oct. 0.0227 0.0194 0.0209
14:01-15:00, Fri., 30 Oct. 0.0229 0.0188 0.0208
13:01-14:00, Fri., 30 Oct. 0.0226 0.0192 0.0207
12:01-13:00, Fri., 30 Oct. 0.0221 0.0188 0.0206
11:01-12:00, Fri., 30 Oct. 0.0223 0.0189 0.0207
10:01-11:00, Fri., 30 Oct. 0.0233 0.0195 0.0213
09:01-10:00, Fri., 30 Oct. 0.0249 0.0203 0.0226
08:01-09:00, Fri., 30 Oct. 0.0297 0.0231 0.0258
07:01-08:00, Fri., 30 Oct. 0.0360 0.0284 0.0320
06:01-07:00, Fri., 30 Oct. 0.0361 0.0238 0.0298
05:01-06:00, Fri., 30 Oct. 0.0259 0.0211 0.0231
04:01-05:00, Fri., 30 Oct. 0.0235 0.0193 0.0211
03:01-04:00, Fri., 30 Oct. 0.0231 0.0191 0.0210
02:01-03:00, Fri., 30 Oct. 0.0223 0.0190 0.0207
01:01-02:00, Fri., 30 Oct. 0.0228 0.0185 0.0205
00:01-01:00, Fri., 30 Oct. 0.0222 0.0186 0.0207
23:01-24:00, Thu., 29 Oct. 0.0224 0.0186 0.0204
22:01-23:00, Thu., 29 Oct. 0.0222 0.0186 0.0204
21:01-22:00, Thu., 29 Oct. 0.0221 0.0189 0.0205
20:01-21:00, Thu., 29 Oct. 0.0223 0.0190 0.0205
19:01-20:00, Thu., 29 Oct. 0.0225 0.0179 0.0204
18:01-19:00, Thu., 29 Oct. 0.0222 0.0189 0.0205
17:01-18:00, Thu., 29 Oct. 0.0222 0.0187 0.0204
16:01-17:00, Thu., 29 Oct. 0.0225 0.0187 0.0207
15:01-16:00, Thu., 29 Oct. 0.0228 0.0194 0.0212
14:01-15:00, Thu., 29 Oct. 0.0225 0.0191 0.0206
13:01-14:00, Thu., 29 Oct. 0.0225 0.0189 0.0208
12:01-13:00, Thu., 29 Oct. 0.0223 0.0196 0.0211
11:01-12:00, Thu., 29 Oct. 0.0229 0.0193 0.0209
10:01-11:00, Thu., 29 Oct. 0.0229 0.0193 0.0210
09:01-10:00, Thu., 29 Oct. 0.0224 0.0186 0.0208
08:01-09:00, Thu., 29 Oct. 0.0223 0.0190 0.0206
07:01-08:00, Thu., 29 Oct. 0.0221 0.0189 0.0204
06:01-07:00, Thu., 29 Oct. 0.0221 0.0186 0.0203
05:01-06:00, Thu., 29 Oct. 0.0216 0.0178 0.0202
04:01-05:00, Thu., 29 Oct. 0.0220 0.0189 0.0204
03:01-04:00, Thu., 29 Oct. 0.0225 0.0180 0.0202
02:01-03:00, Thu., 29 Oct. 0.0226 0.0183 0.0203
01:01-02:00, Thu., 29 Oct. 0.0217 0.0178 0.0202
00:01-01:00, Thu., 29 Oct. 0.0218 0.0183 0.0202
23:01-24:00, Wed., 28 Oct. 0.0224 0.0183 0.0202
22:01-23:00, Wed., 28 Oct. 0.0221 0.0186 0.0202
21:01-22:00, Wed., 28 Oct. 0.0221 0.0179 0.0200
20:01-21:00, Wed., 28 Oct. 0.0217 0.0186 0.0201
19:01-20:00, Wed., 28 Oct. 0.0217 0.0188 0.0203
18:01-19:00, Wed., 28 Oct. 0.0234 0.0185 0.0202
17:01-18:00, Wed., 28 Oct. 0.0214 0.0184 0.0200
16:01-17:00, Wed., 28 Oct. 0.0223 0.0189 0.0204
15:01-16:00, Wed., 28 Oct. 0.0225 0.0189 0.0205
14:01-15:00, Wed., 28 Oct. 0.0221 0.0189 0.0204
13:01-14:00, Wed., 28 Oct. 0.0221 0.0186 0.0206
12:01-13:00, Wed., 28 Oct. 0.0233 0.0192 0.0208
11:01-12:00, Wed., 28 Oct. 0.0224 0.0191 0.0206
10:01-11:00, Wed., 28 Oct. 0.0231 0.0189 0.0210
09:01-10:00, Wed., 28 Oct. 0.0223 0.0189 0.0208
08:01-09:00, Wed., 28 Oct. 0.0225 0.0193 0.0211
07:01-08:00, Wed., 28 Oct. 0.0228 0.0186 0.0208
06:01-07:00, Wed., 28 Oct. 0.0229 0.0190 0.0208
05:01-06:00, Wed., 28 Oct. 0.0227 0.0189 0.0207
04:01-05:00, Wed., 28 Oct. 0.0218 0.0186 0.0204