Center for Ecological-Noosphere Studies of NAS RA, 68 Abovyan str., 0025, Yerevan, Armenia.
Center for Ecological-Noosphere Studies of NAS RA, 68 Abovyan str., 0025, Yerevan, Armenia.
Chemosphere. 2021 Feb;265:129173. doi: 10.1016/j.chemosphere.2020.129173. Epub 2020 Dec 2.
Spatial pattern of naturally occurring radionuclides (NOR): Ra, Th, K, and artificial Cs was studied using soil samples of the multipurpose geochemical survey of the city of Yerevan, capital of Armenia. High purity Ge detector-based gamma spectrometry system was used for the determination of radionuclides activity concentrations in urban soils. A combination of compositional data analysis, geochemical mapping and radiological assessment were applied to reveal potential factors of technologically enhanced natural radioactivity and excess lifetime cancer risk for Yerevan's population due to NOR and artificial Cs in the urban environment. Statistical methods with the geochemical mapping revealed the great contribution of soil-forming rocks to NOR distribution in urban soils. The spatial distribution of calculated radiological indices and dose rates levels follows the distribution patterns of NOR. The activity concentration of fallout radionuclide Cs was within the range typical for the studied altitudes. Above baseline activity of Cs was observed in the north-western and western part of the city that is in typical ranges of Cs content in soil derived from global radioactive fallout. Urban soils of Yerevan were found radiologically safe, however, igneous rock derived soils are a sink of NOR and the main environmental source of continuous exposure to the residents. Values of excess lifetime cancer risk were higher than mean global value.
采用土壤多目标地球化学调查方法对亚美尼亚首都埃里温市的土壤样本进行了天然放射性核素（NOR：Ra、Th、K 和人工 Cs）的空间分布模式研究。高纯度锗探测器伽马能谱系统用于测定城市土壤中放射性核素的活度浓度。应用成分数据分析、地球化学制图和放射性评估相结合的方法，揭示了由于 NOR 和人工 Cs 在城市环境中引起的技术增强天然放射性和额外寿命癌症风险的潜在因素。地球化学制图的统计方法揭示了土壤母岩对城市土壤中 NOR 分布的巨大贡献。计算得出的放射性指标和剂量率水平的空间分布与 NOR 的分布模式一致。沉降核素 Cs 的活度浓度在研究海拔范围内典型。在城市的西北部和西部观察到高于基线的 Cs 活性，这是源自全球放射性沉降的土壤中 Cs 含量的典型范围。埃里温市的城市土壤具有放射性安全性，但火成岩衍生土壤是 NOR 的汇和居民持续暴露的主要环境源。超额寿命癌症风险值高于全球平均值。
