Quantitative Assessment of 131I in Soil Originating from the Fukushima Daiichi Nuclear Power Plant Disaster Using a Germanium Semiconductor Detector
| Autor: | Eisuke Sato, Yutaro Mori, Tomonori Isobe, Kenta Takada, Hideki Takahashi, Hideyuki Sakurai, Takeji Sakae, Satoshi Kamizawa |
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| Rok vydání: | 2015 |
| Předmět: |
Fukushima Daiichi Nuclear Power Plant Disaster
Radionuclide Soil test Radiochemistry Human decontamination Semiconductor detector law.invention Atmosphere Deposition (aerosol physics) 131I HP-Ge Energy(all) law Environmental chemistry Nuclear power plant Environmental science Surface layer Radioactive Fallout |
| Zdroj: | Energy Procedia. 71:370-376 |
| ISSN: | 1876-6102 |
| DOI: | 10.1016/j.egypro.2014.11.890 |
| Popis: | In the accident at the Fukushima Daiichi Nuclear Power Plant (NPP) that accompanied the Great East Japan Earthquake on the 11th of March, 2011, large amounts of radionuclides were released into the atmosphere. Among these released radionuclides, there was an especially large amount of 131 I and 137 Cs. Two years have passed since the accident, and the decontamination of the deposited radionuclides has become a significant task. In the present study, a quantitative evaluation of the depth distribution of 131 I and 137 Cs in the soil using a high-purity germanium semiconductor detector was performed with soil samples collected at Adatara, Fukushima on April 30, 2011. Along with 131 I and 137 Cs, the concentration of radionuclides showed a maximum at a depth of 1 cm under the soil surface, and this attenuated to approximately 1/6 the concentration at the surface layer at a depth of 3 cm. In other words, the deposition of radionuclides was in a comparatively shallow portion of the soil. Additionally, soil surface samples were obtained from various observation sites, and a quantitative evaluation of the concentrations of radionuclides such as 131 I was carried out. The results confirm a high concentration, more than 7000 Bq/kg, of 131 I in samples collected at Nihonmatsu City on April 17, 2011 and samples collected on May 2, 2011 at Iwaki City. The concentration became higher as the distance from the NPP became smaller. However, the measurement values were variable also depending on the diameter of soil particle. |
| Databáze: | OpenAIRE |
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