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
15:01-16:00, Sat., 17 Oct. 0.0237 0.0203 0.0220
14:01-15:00, Sat., 17 Oct. 0.0245 0.0202 0.0222
13:01-14:00, Sat., 17 Oct. 0.0238 0.0203 0.0222
12:01-13:00, Sat., 17 Oct. 0.0238 0.0196 0.0217
11:01-12:00, Sat., 17 Oct. 0.0237 0.0200 0.0220
10:01-11:00, Sat., 17 Oct. 0.0236 0.0207 0.0221
09:01-10:00, Sat., 17 Oct. 0.0238 0.0205 0.0221
08:01-09:00, Sat., 17 Oct. 0.0242 0.0202 0.0219
07:01-08:00, Sat., 17 Oct. 0.0233 0.0201 0.0219
06:01-07:00, Sat., 17 Oct. 0.0234 0.0207 0.0221
05:01-06:00, Sat., 17 Oct. 0.0251 0.0204 0.0221
04:01-05:00, Sat., 17 Oct. 0.0236 0.0197 0.0219
03:01-04:00, Sat., 17 Oct. 0.0232 0.0199 0.0219
02:01-03:00, Sat., 17 Oct. 0.0247 0.0191 0.0217
01:01-02:00, Sat., 17 Oct. 0.0237 0.0202 0.0220
00:01-01:00, Sat., 17 Oct. 0.0236 0.0199 0.0219
23:01-24:00, Fri., 16 Oct. 0.0251 0.0207 0.0223
22:01-23:00, Fri., 16 Oct. 0.0234 0.0204 0.0219
21:01-22:00, Fri., 16 Oct. 0.0238 0.0195 0.0220
20:01-21:00, Fri., 16 Oct. 0.0241 0.0197 0.0217
19:01-20:00, Fri., 16 Oct. 0.0234 0.0196 0.0217
18:01-19:00, Fri., 16 Oct. 0.0246 0.0196 0.0219
17:01-18:00, Fri., 16 Oct. 0.0233 0.0199 0.0216
16:01-17:00, Fri., 16 Oct. 0.0233 0.0200 0.0216
15:01-16:00, Fri., 16 Oct. 0.0242 0.0201 0.0218
14:01-15:00, Fri., 16 Oct. 0.0235 0.0200 0.0218
13:01-14:00, Fri., 16 Oct. 0.0235 0.0204 0.0218
12:01-13:00, Fri., 16 Oct. 0.0239 0.0200 0.0219
11:01-12:00, Fri., 16 Oct. 0.0234 0.0204 0.0219
10:01-11:00, Fri., 16 Oct. 0.0243 0.0203 0.0223
09:01-10:00, Fri., 16 Oct. 0.0245 0.0205 0.0224
08:01-09:00, Fri., 16 Oct. 0.0237 0.0199 0.0220
07:01-08:00, Fri., 16 Oct. 0.0242 0.0207 0.0223
06:01-07:00, Fri., 16 Oct. 0.0235 0.0205 0.0221
05:01-06:00, Fri., 16 Oct. 0.0238 0.0203 0.0219
04:01-05:00, Fri., 16 Oct. 0.0232 0.0200 0.0218
03:01-04:00, Fri., 16 Oct. 0.0234 0.0202 0.0219
02:01-03:00, Fri., 16 Oct. 0.0238 0.0197 0.0220
01:01-02:00, Fri., 16 Oct. 0.0235 0.0193 0.0217
00:01-01:00, Fri., 16 Oct. 0.0232 0.0196 0.0217
23:01-24:00, Thu., 15 Oct. 0.0234 0.0200 0.0216
22:01-23:00, Thu., 15 Oct. 0.0237 0.0200 0.0216
21:01-22:00, Thu., 15 Oct. 0.0234 0.0199 0.0216
20:01-21:00, Thu., 15 Oct. 0.0235 0.0200 0.0216
19:01-20:00, Thu., 15 Oct. 0.0232 0.0197 0.0214
18:01-19:00, Thu., 15 Oct. 0.0233 0.0201 0.0215
17:01-18:00, Thu., 15 Oct. 0.0234 0.0198 0.0216
16:01-17:00, Thu., 15 Oct. 0.0237 0.0202 0.0215
15:01-16:00, Thu., 15 Oct. 0.0235 0.0202 0.0217
14:01-15:00, Thu., 15 Oct. 0.0236 0.0200 0.0217
13:01-14:00, Thu., 15 Oct. 0.0242 0.0196 0.0220
12:01-13:00, Thu., 15 Oct. 0.0245 0.0206 0.0221
11:01-12:00, Thu., 15 Oct. 0.0232 0.0203 0.0218
10:01-11:00, Thu., 15 Oct. 0.0238 0.0203 0.0220
09:01-10:00, Thu., 15 Oct. 0.0236 0.0194 0.0220
08:01-09:00, Thu., 15 Oct. 0.0231 0.0203 0.0217
07:01-08:00, Thu., 15 Oct. 0.0233 0.0201 0.0217
06:01-07:00, Thu., 15 Oct. 0.0248 0.0204 0.0217
05:01-06:00, Thu., 15 Oct. 0.0235 0.0198 0.0219
04:01-05:00, Thu., 15 Oct. 0.0236 0.0203 0.0219
03:01-04:00, Thu., 15 Oct. 0.0239 0.0203 0.0221
02:01-03:00, Thu., 15 Oct. 0.0238 0.0200 0.0220
01:01-02:00, Thu., 15 Oct. 0.0253 0.0207 0.0223
00:01-01:00, Thu., 15 Oct. 0.0238 0.0203 0.0222
23:01-24:00, Wed., 14 Oct. 0.0237 0.0203 0.0222
22:01-23:00, Wed., 14 Oct. 0.0248 0.0203 0.0223
21:01-22:00, Wed., 14 Oct. 0.0237 0.0204 0.0221
20:01-21:00, Wed., 14 Oct. 0.0249 0.0207 0.0220
19:01-20:00, Wed., 14 Oct. 0.0239 0.0196 0.0220
18:01-19:00, Wed., 14 Oct. 0.0239 0.0202 0.0220
17:01-18:00, Wed., 14 Oct. 0.0242 0.0200 0.0219
16:01-17:00, Wed., 14 Oct. 0.0241 0.0193 0.0217
15:01-16:00, Wed., 14 Oct. 0.0239 0.0202 0.0217
14:01-15:00, Wed., 14 Oct. 0.0244 0.0200 0.0219
13:01-14:00, Wed., 14 Oct. 0.0237 0.0206 0.0221
12:01-13:00, Wed., 14 Oct. 0.0251 0.0205 0.0226
11:01-12:00, Wed., 14 Oct. 0.0241 0.0204 0.0223
10:01-11:00, Wed., 14 Oct. 0.0240 0.0205 0.0223
09:01-10:00, Wed., 14 Oct. 0.0237 0.0203 0.0223
08:01-09:00, Wed., 14 Oct. 0.0249 0.0211 0.0227
07:01-08:00, Wed., 14 Oct. 0.0238 0.0205 0.0226
06:01-07:00, Wed., 14 Oct. 0.0242 0.0202 0.0225
05:01-06:00, Wed., 14 Oct. 0.0249 0.0214 0.0227
04:01-05:00, Wed., 14 Oct. 0.0242 0.0207 0.0226
03:01-04:00, Wed., 14 Oct. 0.0242 0.0207 0.0225
02:01-03:00, Wed., 14 Oct. 0.0239 0.0204 0.0224
01:01-02:00, Wed., 14 Oct. 0.0245 0.0202 0.0219
00:01-01:00, Wed., 14 Oct. 0.0237 0.0201 0.0219
23:01-24:00, Tue., 13 Oct. 0.0247 0.0202 0.0219
22:01-23:00, Tue., 13 Oct. 0.0234 0.0197 0.0217
21:01-22:00, Tue., 13 Oct. 0.0238 0.0203 0.0218
20:01-21:00, Tue., 13 Oct. 0.0239 0.0202 0.0218
19:01-20:00, Tue., 13 Oct. 0.0232 0.0196 0.0215
18:01-19:00, Tue., 13 Oct. 0.0231 0.0199 0.0215
17:01-18:00, Tue., 13 Oct. 0.0231 0.0198 0.0212
16:01-17:00, Tue., 13 Oct. 0.0238 0.0203 0.0216
15:01-16:00, Tue., 13 Oct. 0.0243 0.0205 0.0221
14:01-15:00, Tue., 13 Oct. 0.0241 0.0206 0.0219
13:01-14:00, Tue., 13 Oct. 0.0231 0.0200 0.0214
12:01-13:00, Tue., 13 Oct. 0.0235 0.0189 0.0217
11:01-12:00, Tue., 13 Oct. 0.0239 0.0203 0.0220
10:01-11:00, Tue., 13 Oct. 0.0233 0.0204 0.0219
09:01-10:00, Tue., 13 Oct. 0.0237 0.0202 0.0219
08:01-09:00, Tue., 13 Oct. 0.0232 0.0204 0.0221
07:01-08:00, Tue., 13 Oct. 0.0242 0.0200 0.0221
06:01-07:00, Tue., 13 Oct. 0.0235 0.0203 0.0220
05:01-06:00, Tue., 13 Oct. 0.0239 0.0203 0.0224
04:01-05:00, Tue., 13 Oct. 0.0238 0.0201 0.0219
03:01-04:00, Tue., 13 Oct. 0.0237 0.0200 0.0219
02:01-03:00, Tue., 13 Oct. 0.0238 0.0199 0.0218
01:01-02:00, Tue., 13 Oct. 0.0236 0.0196 0.0219
00:01-01:00, Tue., 13 Oct. 0.0242 0.0200 0.0215
23:01-24:00, Mon., 12 Oct. 0.0228 0.0197 0.0214
22:01-23:00, Mon., 12 Oct. 0.0228 0.0197 0.0214
21:01-22:00, Mon., 12 Oct. 0.0230 0.0202 0.0215
20:01-21:00, Mon., 12 Oct. 0.0235 0.0196 0.0214
19:01-20:00, Mon., 12 Oct. 0.0229 0.0194 0.0213
18:01-19:00, Mon., 12 Oct. 0.0231 0.0199 0.0215
17:01-18:00, Mon., 12 Oct. 0.0231 0.0193 0.0214
16:01-17:00, Mon., 12 Oct. 0.0235 0.0198 0.0217
15:01-16:00, Mon., 12 Oct. 0.0235 0.0209 0.0219
14:01-15:00, Mon., 12 Oct. 0.0237 0.0199 0.0219
13:01-14:00, Mon., 12 Oct. 0.0242 0.0202 0.0222
12:01-13:00, Mon., 12 Oct. 0.0235 0.0205 0.0221
11:01-12:00, Mon., 12 Oct. 0.0239 0.0200 0.0221
10:01-11:00, Mon., 12 Oct. 0.0233 0.0205 0.0220
09:01-10:00, Mon., 12 Oct. 0.0248 0.0200 0.0222
08:01-09:00, Mon., 12 Oct. 0.0241 0.0205 0.0222
07:01-08:00, Mon., 12 Oct. 0.0238 0.0211 0.0224
06:01-07:00, Mon., 12 Oct. 0.0241 0.0205 0.0226
05:01-06:00, Mon., 12 Oct. 0.0239 0.0211 0.0226
04:01-05:00, Mon., 12 Oct. 0.0242 0.0200 0.0226
03:01-04:00, Mon., 12 Oct. 0.0249 0.0206 0.0225
02:01-03:00, Mon., 12 Oct. 0.0239 0.0207 0.0224
01:01-02:00, Mon., 12 Oct. 0.0238 0.0203 0.0221
00:01-01:00, Mon., 12 Oct. 0.0231 0.0200 0.0215
23:01-24:00, Sun., 11 Oct. 0.0228 0.0200 0.0214
22:01-23:00, Sun., 11 Oct. 0.0230 0.0196 0.0215
21:01-22:00, Sun., 11 Oct. 0.0236 0.0198 0.0214
20:01-21:00, Sun., 11 Oct. 0.0234 0.0195 0.0216
19:01-20:00, Sun., 11 Oct. 0.0238 0.0196 0.0216
18:01-19:00, Sun., 11 Oct. 0.0237 0.0200 0.0217
17:01-18:00, Sun., 11 Oct. 0.0232 0.0199 0.0216
16:01-17:00, Sun., 11 Oct. 0.0237 0.0193 0.0217
15:01-16:00, Sun., 11 Oct. 0.0235 0.0204 0.0219
14:01-15:00, Sun., 11 Oct. 0.0240 0.0193 0.0217
13:01-14:00, Sun., 11 Oct. 0.0229 0.0200 0.0217
12:01-13:00, Sun., 11 Oct. 0.0238 0.0205 0.0221
11:01-12:00, Sun., 11 Oct. 0.0242 0.0196 0.0220
10:01-11:00, Sun., 11 Oct. 0.0237 0.0201 0.0221
09:01-10:00, Sun., 11 Oct. 0.0248 0.0196 0.0223
08:01-09:00, Sun., 11 Oct. 0.0239 0.0194 0.0224
07:01-08:00, Sun., 11 Oct. 0.0250 0.0210 0.0227
06:01-07:00, Sun., 11 Oct. 0.0246 0.0205 0.0228
05:01-06:00, Sun., 11 Oct. 0.0245 0.0210 0.0225
04:01-05:00, Sun., 11 Oct. 0.0237 0.0208 0.0222
03:01-04:00, Sun., 11 Oct. 0.0244 0.0203 0.0223
02:01-03:00, Sun., 11 Oct. 0.0241 0.0208 0.0225
01:01-02:00, Sun., 11 Oct. 0.0243 0.0207 0.0223
00:01-01:00, Sun., 11 Oct. 0.0249 0.0194 0.0219
23:01-24:00, Sat., 10 Oct. 0.0247 0.0205 0.0221
22:01-23:00, Sat., 10 Oct. 0.0245 0.0194 0.0216
21:01-22:00, Sat., 10 Oct. 0.0231 0.0192 0.0214
20:01-21:00, Sat., 10 Oct. 0.0235 0.0199 0.0215
19:01-20:00, Sat., 10 Oct. 0.0235 0.0196 0.0215
18:01-19:00, Sat., 10 Oct. 0.0239 0.0201 0.0217
17:01-18:00, Sat., 10 Oct. 0.0237 0.0200 0.0218
16:01-17:00, Sat., 10 Oct. 0.0235 0.0201 0.0214
15:01-16:00, Sat., 10 Oct. 0.0235 0.0200 0.0215
14:01-15:00, Sat., 10 Oct. 0.0242 0.0195 0.0217
13:01-14:00, Sat., 10 Oct. 0.0241 0.0200 0.0218
12:01-13:00, Sat., 10 Oct. 0.0236 0.0197 0.0217
11:01-12:00, Sat., 10 Oct. 0.0235 0.0200 0.0216
10:01-11:00, Sat., 10 Oct. 0.0240 0.0203 0.0220
09:01-10:00, Sat., 10 Oct. 0.0242 0.0196 0.0221
08:01-09:00, Sat., 10 Oct. 0.0239 0.0203 0.0221
07:01-08:00, Sat., 10 Oct. 0.0238 0.0200 0.0221
06:01-07:00, Sat., 10 Oct. 0.0239 0.0206 0.0224
05:01-06:00, Sat., 10 Oct. 0.0239 0.0202 0.0223
04:01-05:00, Sat., 10 Oct. 0.0237 0.0208 0.0221
03:01-04:00, Sat., 10 Oct. 0.0234 0.0203 0.0219
02:01-03:00, Sat., 10 Oct. 0.0237 0.0205 0.0221
01:01-02:00, Sat., 10 Oct. 0.0242 0.0201 0.0222
00:01-01:00, Sat., 10 Oct. 0.0243 0.0208 0.0223
23:01-24:00, Fri., 09 Oct. 0.0235 0.0201 0.0218
22:01-23:00, Fri., 09 Oct. 0.0229 0.0200 0.0216
21:01-22:00, Fri., 09 Oct. 0.0231 0.0196 0.0215
20:01-21:00, Fri., 09 Oct. 0.0234 0.0202 0.0218
19:01-20:00, Fri., 09 Oct. 0.0235 0.0190 0.0214
18:01-19:00, Fri., 09 Oct. 0.0228 0.0201 0.0216
17:01-18:00, Fri., 09 Oct. 0.0231 0.0194 0.0214
16:01-17:00, Fri., 09 Oct. 0.0233 0.0201 0.0217
15:01-16:00, Fri., 09 Oct. 0.0235 0.0200 0.0216
14:01-15:00, Fri., 09 Oct. 0.0233 0.0200 0.0217
13:01-14:00, Fri., 09 Oct. 0.0232 0.0205 0.0219
12:01-13:00, Fri., 09 Oct. 0.0235 0.0202 0.0217
11:01-12:00, Fri., 09 Oct. 0.0248 0.0197 0.0216
10:01-11:00, Fri., 09 Oct. 0.0237 0.0205 0.0219
09:01-10:00, Fri., 09 Oct. 0.0239 0.0205 0.0221
08:01-09:00, Fri., 09 Oct. 0.0243 0.0207 0.0225
07:01-08:00, Fri., 09 Oct. 0.0245 0.0210 0.0223
06:01-07:00, Fri., 09 Oct. 0.0240 0.0200 0.0222
05:01-06:00, Fri., 09 Oct. 0.0245 0.0199 0.0222
04:01-05:00, Fri., 09 Oct. 0.0242 0.0195 0.0219
03:01-04:00, Fri., 09 Oct. 0.0238 0.0200 0.0217
02:01-03:00, Fri., 09 Oct. 0.0246 0.0197 0.0220
01:01-02:00, Fri., 09 Oct. 0.0238 0.0205 0.0221
00:01-01:00, Fri., 09 Oct. 0.0231 0.0200 0.0217
23:01-24:00, Thu., 08 Oct. 0.0230 0.0197 0.0214
22:01-23:00, Thu., 08 Oct. 0.0231 0.0201 0.0215
21:01-22:00, Thu., 08 Oct. 0.0234 0.0200 0.0213
20:01-21:00, Thu., 08 Oct. 0.0226 0.0192 0.0212
19:01-20:00, Thu., 08 Oct. 0.0233 0.0192 0.0212
18:01-19:00, Thu., 08 Oct. 0.0234 0.0200 0.0215
17:01-18:00, Thu., 08 Oct. 0.0234 0.0197 0.0214
16:01-17:00, Thu., 08 Oct. 0.0235 0.0197 0.0216
15:01-16:00, Thu., 08 Oct. 0.0235 0.0195 0.0214
14:01-15:00, Thu., 08 Oct. 0.0236 0.0196 0.0216
13:01-14:00, Thu., 08 Oct. 0.0238 0.0196 0.0215
12:01-13:00, Thu., 08 Oct. 0.0232 0.0191 0.0214
11:01-12:00, Thu., 08 Oct. 0.0238 0.0196 0.0217
10:01-11:00, Thu., 08 Oct. 0.0238 0.0202 0.0218
09:01-10:00, Thu., 08 Oct. 0.0236 0.0200 0.0218
08:01-09:00, Thu., 08 Oct. 0.0238 0.0200 0.0222
07:01-08:00, Thu., 08 Oct. 0.0237 0.0196 0.0218
06:01-07:00, Thu., 08 Oct. 0.0240 0.0203 0.0217
05:01-06:00, Thu., 08 Oct. 0.0237 0.0197 0.0217
04:01-05:00, Thu., 08 Oct. 0.0234 0.0193 0.0217
03:01-04:00, Thu., 08 Oct. 0.0228 0.0192 0.0215
02:01-03:00, Thu., 08 Oct. 0.0238 0.0197 0.0214
01:01-02:00, Thu., 08 Oct. 0.0237 0.0190 0.0216
00:01-01:00, Thu., 08 Oct. 0.0237 0.0195 0.0214
23:01-24:00, Wed., 07 Oct. 0.0235 0.0198 0.0216
22:01-23:00, Wed., 07 Oct. 0.0235 0.0196 0.0215
21:01-22:00, Wed., 07 Oct. 0.0231 0.0195 0.0212
20:01-21:00, Wed., 07 Oct. 0.0235 0.0199 0.0213
19:01-20:00, Wed., 07 Oct. 0.0231 0.0195 0.0215
18:01-19:00, Wed., 07 Oct. 0.0231 0.0199 0.0215
17:01-18:00, Wed., 07 Oct. 0.0237 0.0193 0.0215
16:01-17:00, Wed., 07 Oct. 0.0238 0.0196 0.0216