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首页> 外文期刊>Proceedings of the International Association of Hydrological Sciences >Time changes of dose equivalent rate above the soil surface as indication of natural attenuation processes
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Time changes of dose equivalent rate above the soil surface as indication of natural attenuation processes

机译：土壤表面上方剂量等同速率的时间变化作为自然衰减过程的指示

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Eight sites in the Fukushima contaminated area were surveyed for long-term changes in D-shuttle dose equivalent rate above the soil surface during 2015–2017. D-shuttle readings in most cases decreased faster than if due to radioactive decay only. More rapid decrease can be explained by natural attenuation processes, such as erosion of the topsoil, the vertical migration of radionuclides in the soil and the deposition of cleaner sediments transported by surface runoff. According to the time dependencies of D-shuttle dose rate readings integral rate constants of the natural attenuation were estimated using the exponential trend-line. Estimated rate constants of natural attenuation ranged from 7.3×10-3 to 0.48 yr?1, while the correspondent a half-dose rate decrease was 1.4–95?years.
机译：福岛污染区域中的八个位点被调查用于2015-2017期间土壤表面上方的D-Shuttle剂量等效率的长期变化。 D-Shuttle读数在大多数情况下较快减少，而不是仅由于放射性衰减而变得更快。通过天然衰减过程（例如TOPSOIL的腐蚀）解释更快的减少，土壤中放射性核素的垂直迁移和表面径流输送的清洁沉积物的沉积。根据D-Shuttle剂量率读数的时间依赖性，使用指数趋势线估计天然衰减的整体速率常数。自然衰减的估计速率常数范围为7.3×10-3至0.48 YR？1，而相应的半剂量率降低为1.4-95岁。

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