Abstract：
Soil is an important source and medium of radionuclides, and the content of radioactivity in soil is crucial for radiological impact evaluation. In this study, twenty soil samples in the high background natural radiation area of Yangjiang, China were collected and analyzed for 226Ra, 232Th, 40K and 137Cs concentrations in order to evaluate the radiological health risk in the area. Results showed that the average activity concentrations of 226Ra, 232Th and 40K are 66 Bq/kg, 109 Bq/kg and 211 Bq/kg, respectively. The calculated radiological parameters of radium equivalent activity (Raeq), absorbed dose rate (D), annual effective dose equivalent (AEDE), internal and external hazard indices (Hin and Hex) show a large variation at different sampling sites. Additionally, the elemental oxidation composition and 40K/K mass ratio in the soil were analyzed to further augment the background information of the high background radiation area in Yangjiang.
摘要：
土壤是放射性核素的重要来源和介质,土壤中放射性的含量对放射性影响评价至关重要。在这项研究中,阳江高背景自然辐射区的20个土壤样品，中国收集并分析了226Ra，232Th,40K和137Cs浓度，以评估该地区的放射健康风险。结果表明，226Ra的平均活性浓度，232Th和40K为66Bq/kg，109Bq/kg和211Bq/kg，分别。计算出的镭等效活度（Raeq）的放射学参数，吸收剂量率（D），年有效剂量当量（AEDE），内部和外部危险指数(Hin和Hex)在不同采样点显示出很大的差异。此外,分析了土壤中元素氧化组成和40K/K质量比，以进一步增强阳江高背景辐射区的背景信息。
