Measurement results by the hour (Chofu) 4 May., 2026 - 10 May., 2026
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 | |
| 23:01-24:00, Sun., 10 May. | 0.0306 | 0.0264 | 0.0281 |
| 22:01-23:00, Sun., 10 May. | 0.0296 | 0.0249 | 0.0280 |
| 21:01-22:00, Sun., 10 May. | 0.0302 | 0.0263 | 0.0280 |
| 20:01-21:00, Sun., 10 May. | 0.0297 | 0.0265 | 0.0281 |
| 19:01-20:00, Sun., 10 May. | 0.0299 | 0.0256 | 0.0279 |
| 18:01-19:00, Sun., 10 May. | 0.0298 | 0.0256 | 0.0275 |
| 17:01-18:00, Sun., 10 May. | 0.0297 | 0.0261 | 0.0280 |
| 16:01-17:00, Sun., 10 May. | 0.0311 | 0.0260 | 0.0279 |
| 15:01-16:00, Sun., 10 May. | 0.0308 | 0.0259 | 0.0279 |
| 14:01-15:00, Sun., 10 May. | 0.0315 | 0.0264 | 0.0283 |
| 13:01-14:00, Sun., 10 May. | 0.0298 | 0.0265 | 0.0282 |
| 12:01-13:00, Sun., 10 May. | 0.0298 | 0.0259 | 0.0281 |
| 11:01-12:00, Sun., 10 May. | 0.0306 | 0.0257 | 0.0282 |
| 10:01-11:00, Sun., 10 May. | 0.0299 | 0.0259 | 0.0282 |
| 09:01-10:00, Sun., 10 May. | 0.0309 | 0.0261 | 0.0286 |
| 08:01-09:00, Sun., 10 May. | 0.0308 | 0.0261 | 0.0284 |
| 07:01-08:00, Sun., 10 May. | 0.0310 | 0.0260 | 0.0287 |
| 06:01-07:00, Sun., 10 May. | 0.0310 | 0.0270 | 0.0290 |
| 05:01-06:00, Sun., 10 May. | 0.0322 | 0.0273 | 0.0293 |
| 04:01-05:00, Sun., 10 May. | 0.0311 | 0.0270 | 0.0292 |
| 03:01-04:00, Sun., 10 May. | 0.0313 | 0.0271 | 0.0290 |
| 02:01-03:00, Sun., 10 May. | 0.0311 | 0.0266 | 0.0284 |
| 01:01-02:00, Sun., 10 May. | 0.0304 | 0.0264 | 0.0281 |
| 00:01-01:00, Sun., 10 May. | 0.0301 | 0.0259 | 0.0281 |
| 23:01-24:00, Sat., 09 May. | 0.0296 | 0.0258 | 0.0279 |
| 22:01-23:00, Sat., 09 May. | 0.0307 | 0.0259 | 0.0278 |
| 21:01-22:00, Sat., 09 May. | 0.0310 | 0.0257 | 0.0279 |
| 20:01-21:00, Sat., 09 May. | 0.0298 | 0.0256 | 0.0279 |
| 19:01-20:00, Sat., 09 May. | 0.0301 | 0.0256 | 0.0279 |
| 18:01-19:00, Sat., 09 May. | 0.0307 | 0.0259 | 0.0278 |
| 17:01-18:00, Sat., 09 May. | 0.0310 | 0.0255 | 0.0279 |
| 16:01-17:00, Sat., 09 May. | 0.0317 | 0.0262 | 0.0279 |
| 15:01-16:00, Sat., 09 May. | 0.0304 | 0.0262 | 0.0281 |
| 14:01-15:00, Sat., 09 May. | 0.0308 | 0.0256 | 0.0280 |
| 13:01-14:00, Sat., 09 May. | 0.0312 | 0.0262 | 0.0282 |
| 12:01-13:00, Sat., 09 May. | 0.0298 | 0.0262 | 0.0281 |
| 11:01-12:00, Sat., 09 May. | 0.0304 | 0.0251 | 0.0284 |
| 10:01-11:00, Sat., 09 May. | 0.0296 | 0.0260 | 0.0280 |
| 09:01-10:00, Sat., 09 May. | 0.0312 | 0.0262 | 0.0280 |
| 08:01-09:00, Sat., 09 May. | 0.0297 | 0.0259 | 0.0280 |
| 07:01-08:00, Sat., 09 May. | 0.0308 | 0.0263 | 0.0282 |
| 06:01-07:00, Sat., 09 May. | 0.0305 | 0.0259 | 0.0282 |
| 05:01-06:00, Sat., 09 May. | 0.0304 | 0.0253 | 0.0282 |
| 04:01-05:00, Sat., 09 May. | 0.0309 | 0.0260 | 0.0284 |
| 03:01-04:00, Sat., 09 May. | 0.0304 | 0.0268 | 0.0284 |
| 02:01-03:00, Sat., 09 May. | 0.0314 | 0.0263 | 0.0281 |
| 01:01-02:00, Sat., 09 May. | 0.0304 | 0.0261 | 0.0283 |
| 00:01-01:00, Sat., 09 May. | 0.0306 | 0.0261 | 0.0282 |
| 23:01-24:00, Fri., 08 May. | 0.0313 | 0.0259 | 0.0283 |
| 22:01-23:00, Fri., 08 May. | 0.0305 | 0.0251 | 0.0280 |
| 21:01-22:00, Fri., 08 May. | 0.0306 | 0.0256 | 0.0280 |
| 20:01-21:00, Fri., 08 May. | 0.0300 | 0.0251 | 0.0279 |
| 19:01-20:00, Fri., 08 May. | 0.0308 | 0.0260 | 0.0277 |
| 18:01-19:00, Fri., 08 May. | 0.0295 | 0.0256 | 0.0279 |
| 17:01-18:00, Fri., 08 May. | 0.0298 | 0.0262 | 0.0277 |
| 16:01-17:00, Fri., 08 May. | 0.0297 | 0.0265 | 0.0279 |
| 15:01-16:00, Fri., 08 May. | 0.0301 | 0.0262 | 0.0279 |
| 14:01-15:00, Fri., 08 May. | 0.0305 | 0.0256 | 0.0279 |
| 13:01-14:00, Fri., 08 May. | 0.0311 | 0.0260 | 0.0278 |
| 12:01-13:00, Fri., 08 May. | 0.0298 | 0.0257 | 0.0278 |
| 11:01-12:00, Fri., 08 May. | 0.0308 | 0.0258 | 0.0281 |
| 10:01-11:00, Fri., 08 May. | 0.0311 | 0.0263 | 0.0287 |
| 09:01-10:00, Fri., 08 May. | 0.0310 | 0.0266 | 0.0285 |
| 08:01-09:00, Fri., 08 May. | 0.0306 | 0.0260 | 0.0285 |
| 07:01-08:00, Fri., 08 May. | 0.0307 | 0.0269 | 0.0290 |
| 06:01-07:00, Fri., 08 May. | 0.0311 | 0.0273 | 0.0289 |
| 05:01-06:00, Fri., 08 May. | 0.0308 | 0.0263 | 0.0287 |
| 04:01-05:00, Fri., 08 May. | 0.0316 | 0.0268 | 0.0285 |
| 03:01-04:00, Fri., 08 May. | 0.0301 | 0.0263 | 0.0282 |
| 02:01-03:00, Fri., 08 May. | 0.0304 | 0.0265 | 0.0283 |
| 01:01-02:00, Fri., 08 May. | 0.0305 | 0.0252 | 0.0279 |
| 00:01-01:00, Fri., 08 May. | 0.0301 | 0.0259 | 0.0281 |
| 23:01-24:00, Thu., 07 May. | 0.0296 | 0.0263 | 0.0279 |
| 22:01-23:00, Thu., 07 May. | 0.0298 | 0.0261 | 0.0279 |
| 21:01-22:00, Thu., 07 May. | 0.0296 | 0.0254 | 0.0273 |
| 20:01-21:00, Thu., 07 May. | 0.0298 | 0.0256 | 0.0275 |
| 19:01-20:00, Thu., 07 May. | 0.0309 | 0.0249 | 0.0274 |
| 18:01-19:00, Thu., 07 May. | 0.0294 | 0.0249 | 0.0272 |
| 17:01-18:00, Thu., 07 May. | 0.0307 | 0.0252 | 0.0276 |
| 16:01-17:00, Thu., 07 May. | 0.0295 | 0.0253 | 0.0276 |
| 15:01-16:00, Thu., 07 May. | 0.0297 | 0.0249 | 0.0276 |
| 14:01-15:00, Thu., 07 May. | 0.0305 | 0.0259 | 0.0275 |
| 13:01-14:00, Thu., 07 May. | 0.0298 | 0.0252 | 0.0276 |
| 12:01-13:00, Thu., 07 May. | 0.0300 | 0.0252 | 0.0275 |
| 11:01-12:00, Thu., 07 May. | 0.0297 | 0.0256 | 0.0280 |
| 10:01-11:00, Thu., 07 May. | 0.0304 | 0.0256 | 0.0279 |
| 09:01-10:00, Thu., 07 May. | 0.0308 | 0.0259 | 0.0282 |
| 08:01-09:00, Thu., 07 May. | 0.0312 | 0.0249 | 0.0280 |
| 07:01-08:00, Thu., 07 May. | 0.0311 | 0.0261 | 0.0285 |
| 06:01-07:00, Thu., 07 May. | 0.0311 | 0.0270 | 0.0286 |
| 05:01-06:00, Thu., 07 May. | 0.0305 | 0.0265 | 0.0284 |
| 04:01-05:00, Thu., 07 May. | 0.0299 | 0.0259 | 0.0283 |
| 03:01-04:00, Thu., 07 May. | 0.0302 | 0.0263 | 0.0278 |
| 02:01-03:00, Thu., 07 May. | 0.0298 | 0.0261 | 0.0278 |
| 01:01-02:00, Thu., 07 May. | 0.0294 | 0.0256 | 0.0276 |
| 00:01-01:00, Thu., 07 May. | 0.0308 | 0.0259 | 0.0275 |
| 23:01-24:00, Wed., 06 May. | 0.0295 | 0.0255 | 0.0277 |
| 22:01-23:00, Wed., 06 May. | 0.0294 | 0.0252 | 0.0274 |
| 21:01-22:00, Wed., 06 May. | 0.0296 | 0.0249 | 0.0273 |
| 20:01-21:00, Wed., 06 May. | 0.0297 | 0.0253 | 0.0276 |
| 19:01-20:00, Wed., 06 May. | 0.0301 | 0.0253 | 0.0275 |
| 18:01-19:00, Wed., 06 May. | 0.0290 | 0.0253 | 0.0274 |
| 17:01-18:00, Wed., 06 May. | 0.0290 | 0.0258 | 0.0274 |
| 16:01-17:00, Wed., 06 May. | 0.0293 | 0.0249 | 0.0274 |
| 15:01-16:00, Wed., 06 May. | 0.0301 | 0.0249 | 0.0276 |
| 14:01-15:00, Wed., 06 May. | 0.0294 | 0.0259 | 0.0276 |
| 13:01-14:00, Wed., 06 May. | 0.0299 | 0.0250 | 0.0273 |
| 12:01-13:00, Wed., 06 May. | 0.0292 | 0.0257 | 0.0275 |
| 11:01-12:00, Wed., 06 May. | 0.0302 | 0.0258 | 0.0278 |
| 10:01-11:00, Wed., 06 May. | 0.0298 | 0.0263 | 0.0279 |
| 09:01-10:00, Wed., 06 May. | 0.0306 | 0.0259 | 0.0280 |
| 08:01-09:00, Wed., 06 May. | 0.0303 | 0.0252 | 0.0282 |
| 07:01-08:00, Wed., 06 May. | 0.0307 | 0.0263 | 0.0284 |
| 06:01-07:00, Wed., 06 May. | 0.0299 | 0.0262 | 0.0279 |
| 05:01-06:00, Wed., 06 May. | 0.0303 | 0.0256 | 0.0278 |
| 04:01-05:00, Wed., 06 May. | 0.0297 | 0.0252 | 0.0277 |
| 03:01-04:00, Wed., 06 May. | 0.0296 | 0.0252 | 0.0274 |
| 02:01-03:00, Wed., 06 May. | 0.0298 | 0.0250 | 0.0272 |
| 01:01-02:00, Wed., 06 May. | 0.0297 | 0.0253 | 0.0271 |
| 00:01-01:00, Wed., 06 May. | 0.0293 | 0.0251 | 0.0274 |
| 23:01-24:00, Tue., 05 May. | 0.0307 | 0.0252 | 0.0276 |
| 22:01-23:00, Tue., 05 May. | 0.0295 | 0.0255 | 0.0274 |
| 21:01-22:00, Tue., 05 May. | 0.0294 | 0.0252 | 0.0276 |
| 20:01-21:00, Tue., 05 May. | 0.0304 | 0.0250 | 0.0276 |
| 19:01-20:00, Tue., 05 May. | 0.0298 | 0.0256 | 0.0274 |
| 18:01-19:00, Tue., 05 May. | 0.0293 | 0.0251 | 0.0275 |
| 17:01-18:00, Tue., 05 May. | 0.0292 | 0.0249 | 0.0274 |
| 16:01-17:00, Tue., 05 May. | 0.0291 | 0.0245 | 0.0274 |
| 15:01-16:00, Tue., 05 May. | 0.0291 | 0.0255 | 0.0275 |
| 14:01-15:00, Tue., 05 May. | 0.0300 | 0.0257 | 0.0276 |
| 13:01-14:00, Tue., 05 May. | 0.0292 | 0.0253 | 0.0275 |
| 12:01-13:00, Tue., 05 May. | 0.0295 | 0.0252 | 0.0275 |
| 11:01-12:00, Tue., 05 May. | 0.0296 | 0.0249 | 0.0276 |
| 10:01-11:00, Tue., 05 May. | 0.0294 | 0.0246 | 0.0273 |
| 09:01-10:00, Tue., 05 May. | 0.0295 | 0.0254 | 0.0274 |
| 08:01-09:00, Tue., 05 May. | 0.0298 | 0.0259 | 0.0275 |
| 07:01-08:00, Tue., 05 May. | 0.0296 | 0.0241 | 0.0276 |
| 06:01-07:00, Tue., 05 May. | 0.0295 | 0.0257 | 0.0276 |
| 05:01-06:00, Tue., 05 May. | 0.0298 | 0.0247 | 0.0274 |
| 04:01-05:00, Tue., 05 May. | 0.0290 | 0.0253 | 0.0274 |
| 03:01-04:00, Tue., 05 May. | 0.0295 | 0.0256 | 0.0274 |
| 02:01-03:00, Tue., 05 May. | 0.0293 | 0.0255 | 0.0274 |
| 01:01-02:00, Tue., 05 May. | 0.0306 | 0.0256 | 0.0274 |
| 00:01-01:00, Tue., 05 May. | 0.0297 | 0.0245 | 0.0275 |
| 23:01-24:00, Mon., 04 May. | 0.0297 | 0.0259 | 0.0277 |
| 22:01-23:00, Mon., 04 May. | 0.0295 | 0.0259 | 0.0278 |
| 21:01-22:00, Mon., 04 May. | 0.0297 | 0.0252 | 0.0277 |
| 20:01-21:00, Mon., 04 May. | 0.0301 | 0.0256 | 0.0276 |
| 19:01-20:00, Mon., 04 May. | 0.0298 | 0.0251 | 0.0275 |
| 18:01-19:00, Mon., 04 May. | 0.0294 | 0.0253 | 0.0276 |
| 17:01-18:00, Mon., 04 May. | 0.0301 | 0.0255 | 0.0276 |
| 16:01-17:00, Mon., 04 May. | 0.0301 | 0.0259 | 0.0281 |
| 15:01-16:00, Mon., 04 May. | 0.0300 | 0.0264 | 0.0281 |
| 14:01-15:00, Mon., 04 May. | 0.0306 | 0.0260 | 0.0283 |
| 13:01-14:00, Mon., 04 May. | 0.0310 | 0.0262 | 0.0283 |
| 12:01-13:00, Mon., 04 May. | 0.0305 | 0.0256 | 0.0281 |
| 11:01-12:00, Mon., 04 May. | 0.0301 | 0.0254 | 0.0282 |
| 10:01-11:00, Mon., 04 May. | 0.0311 | 0.0263 | 0.0284 |
| 09:01-10:00, Mon., 04 May. | 0.0305 | 0.0264 | 0.0282 |
| 08:01-09:00, Mon., 04 May. | 0.0310 | 0.0265 | 0.0286 |
| 07:01-08:00, Mon., 04 May. | 0.0339 | 0.0273 | 0.0310 |
| 06:01-07:00, Mon., 04 May. | 0.0442 | 0.0322 | 0.0378 |
| 05:01-06:00, Mon., 04 May. | 0.0443 | 0.0358 | 0.0406 |
| 04:01-05:00, Mon., 04 May. | 0.0365 | 0.0293 | 0.0321 |
| 03:01-04:00, Mon., 04 May. | 0.0343 | 0.0277 | 0.0300 |
| 02:01-03:00, Mon., 04 May. | 0.0298 | 0.0263 | 0.0280 |
| 01:01-02:00, Mon., 04 May. | 0.0306 | 0.0261 | 0.0281 |
| 00:01-01:00, Mon., 04 May. | 0.0295 | 0.0261 | 0.0279 |