Radioactivity Dynamics in River System
（2017）
ＱDo radiation does will increase using bathing beach?
ＡRadiation doses do not increase by swimming off any beach in Fukushima Prefecture.
- Air dose rates measured at the beaches in Fukushima Prefecture were 0.03-0.07 μSv/h. The values are same as the air dose rates before the accident of the Fukushima Daiichi Nuclear Power Station.
- The concentration of radioactive cesium (134Cs and 137Cs) in seawater was lower than the detection limit.
- Radioactivities were also investigated at beaches in Miyagi Prefecture in 2017. No radioactive cesium was detected.
Reference： Results of radioactivity monitoring survey at swimming beach(2nd in FY2019) (The nuclear emergency response headquarters)
| No. | Beach | City | Classification | Air dose rate at lakeshore or sea shore (µSv/h) |
Concentration of radioactive materials in lake water or seawater（Bq/L） |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Observation date |
Ground surface (1 cm height) |
50 cm height |
1 m height |
Sampling position |
Radioactive cesium |
Total β-ray |
Tritium | |||||
| 134Cs | 137Cs | |||||||||||
| Beach that will be open in this summer | ||||||||||||
| 1 | Sakkahama | Aizuwakamatsu City | Lake beach | July 26 | 0.02 | 0.03 | 0.03 | Surface | N.D. | N.D. | - | - |
| 2 | Nakadahama | July 26 | 0.03 | 0.03 | 0.03 | Surface layer | N.D. | N.D. | - | - | ||
| 3 | Koishigahama | July 26 | 0.03 | 0.04 | 0.04 | Surface layer | N.D. | N.D. | - | - | ||
| 4 | Nagahama | Inawashiro Town | July 26 | 0.05 | 0.05 | 0.05 | Surface layer | N.D. | N.D. | - | - | |
| 5 | Tenjinhama | July 26 | 0.03 | 0.03 | 0.04 | Surface layer | N.D. | N.D. | - | - | ||
| 6 | Shidahama | July 26 | 0.05 | 0.05 | 0.05 | Surface layer | N.D. | N.D. | - | - | ||
| 7 | Joukohama | July 26 | 0.07 | 0.06 | 0.06 | Surface layer | N.D. | N.D. | - | - | ||
| 8 | Hamajihama | Koriyama City | July 23 | 0.06 | 0.06 | 0.05 | Surface layer | N.D. | N.D. | - | - | |
| 9 | Yokozawahama | July 23 | 0.06 | 0.05 | 0.04 | Surface layer | N.D. | N.D. | - | - | ||
| 10 | Tatehama | July 23 | 0.05 | 0.05 | 0.05 | Surface layer | N.D. | N.D. | - | - | ||
| 11 | Funatsuhama | July 23 | 0.04 | 0.05 | 0.05 | Surface layer | N.D. | N.D. | - | - | ||
| 12 | Funatsu Park | July 23 | 0.05 | 0.05 | 0.05 | Surface layer | N.D. | N.D. | - | - | ||
| 13 | Seishogahama | July 23 | 0.04 | 0.04 | 0.03 | Surface layer | N.D. | N.D. | - | - | ||
| 14 | Akiyamahama | July 23 | 0.03 | 0.03 | 0.03 | Surface layer | N.D. | N.D. | - | - | ||
| 15 | Tsurushihama | Shinchi Town | Sea beach | July 30 | 0.03 | 0.03 | 0.03 | Surface layer | N.D. | N.D. | 0.02 | N.D. |
| 16 | Haragama Obama | Soma City | July 30 | 0.04 | 0.04 | 0.03 | Surface layer | N.D. | N.D. | 0.02 | N.D. | |
| 17 | Kitaizumi | Minamisoma City | July 30 | 0.04 | 0.04 | 0.03 | Surface layer | N.D. | N.D. | 0.01 | N.D. | |
| 18 | Hisanohama Hattachi | Iwaki City | July 22 | 0.05 | 0.05 | 0.05 | Surface layer | N.D. | N.D. | 0.02 | N.D. | |
| 19 | Yotsukura | July 22 | 0.04 | 0.04 | 0.04 | Surface layer | N.D. | N.D. | 0.01 | N.D. | ||
| 20 | Usuiso | July 22 | 0.04 | 0.03 | 0.03 | Surface layer | N.D. | N.D. | 0.01 | N.D. | ||
| 21 | Nakoso (north) | July 22 | 0.05 | 0.04 | 0.04 | Surface layer | N.D. | N.D. | - | - | ||
| Nakoso (south) | July 22 | 0.05 | 0.04 | 0.04 | Surface layer | N.D. | N.D. | 0.01 | N.D. | |||
∗N.D; Not detected.
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