Faculty of Engineering, University of Kyrenia, Kyrenia, via Mersin 10, Turkey; Faculty of Engineering, Near East University, Nicosia, via Mersin 10, Turkey.
Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia; Faculty of Science, Al Azhar University, Assiut, Egypt.
Mar Pollut Bull. 2020 Dec;161(Pt A):111793. doi: 10.1016/j.marpolbul.2020.111793. Epub 2020 Nov 6.
In this study, surface sediment samples from the North Cyprus East coast of the Mediterranean Sea were collected to determine the concentrations of three main natural radionuclides (Ra, Th, and K) using a high-resolution HPGe gamma-spectroscopy system. The activity concentrations of Ra, Th, and K in the selected sediment samples ranged from 11.5 to 31.6, 11.8 to 24.9, and 391.7 to 1014 Bq kg dw (dry weight), respectively. The concentration distribution analysis showed that the kurtosis statistics parameter was negative, and the concentration distribution was less peaked than the normal curve. The mean activity concentrations of K (628.1 Bq kg) in the sediment samples was higher than the worldwide average (420 Bq kg) concentration. The radium equivalent activity, external hazard, internal hazard and gamma activity concentration indexes were calculated to assess the pollution and risk level of radionuclides. The radiological risk assessment indicated that observed values were below the threshold values.
本研究采集了地中海北塞浦路斯东海岸的表层沉积物样本，使用高分辨率 HPGe 伽马能谱系统测定了三种主要天然放射性核素（Ra、Th 和 K）的浓度。在所选择的沉积物样本中，Ra、Th 和 K 的活度浓度范围分别为 11.5 至 31.6、11.8 至 24.9 和 391.7 至 1014 Bq kg dw（干重）。浓度分布分析表明，峰度统计参数为负值，浓度分布比正态曲线的峰度要小。沉积物样品中 K（628.1 Bq kg）的平均活度浓度高于世界平均浓度（420 Bq kg）。通过计算镭当量活度、外照射指数、内照射指数和伽马活度浓度指数，评估了放射性核素的污染和风险水平。放射性风险评估表明，观测值低于阈值。
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