Patiris D L, Tsabaris C, Anagnostou C L, Androulakaki E G, Pappa F K, Eleftheriou G, Sgouros G
Hellenic Centre for Marine Research, Institute of Oceanography, Anavyssos, Greece.
Hellenic Centre for Marine Research, Institute of Oceanography, Anavyssos, Greece.
J Environ Radioact. 2016 Jun;157:1-15. doi: 10.1016/j.jenvrad.2016.02.025. Epub 2016 Mar 4.
Tigris and Euphrates rivers both emerge in eastern Turkey and cross Syria and Iraq. They unite to Shatt al-Arab/Arvand Rud River and discharge in Arabic/Persian Gulf. The activity concentration of natural and anthropogenic radionuclides was measured during the August of 2011 in a number of surficial sediment samples collected from the seabed along an almost straight line beginning near the estuary mouth and extending seaward. The results exhibited low activity concentration levels and an almost homogeneous spatial distribution except locations where sediment of biogenic origin, poor in radionuclides, dilute their concentrations. Dose rates absorbed by reference marine biota were calculated by the ERICA Assessment Tool considering the contribution of 40 K. The results revealed a relatively low impact of 40 K mainly to species living in, on and close to the seabed. Also, statistical association of radionuclides with selected stable elements (Ca, Ba and Sr) did not indicate presence of by-products related with oil and gas exploitation and transportation activities. Moreover, a semi-empirical sedimentology model applied to reproduce seabed granulometric facies based entirely on radionuclides activity concentrations.
底格里斯河和幼发拉底河均发源于土耳其东部，流经叙利亚和伊拉克。它们在阿拉伯河/阿拉伯河（什叶派阿拉伯河/阿拉伯河）汇合并注入阿拉伯湾/波斯湾。2011年8月，对从河口附近开始并向海延伸的几乎一条直线上的海底采集的一些表层沉积物样本中的天然和人为放射性核素的活度浓度进行了测量。结果显示活度浓度水平较低，且空间分布几乎均匀，但生物源沉积物中放射性核素含量较低，稀释了其浓度的区域除外。考虑到40K的贡献，通过ERICA评估工具计算了参考海洋生物群吸收的剂量率。结果表明，40K对主要生活在海底、海底之上及附近的物种的影响相对较小。此外，放射性核素与选定稳定元素（钙、钡和锶）的统计关联并未表明存在与油气开采和运输活动相关的副产品。此外，应用了一个半经验沉积学模型，完全基于放射性核素活度浓度来重现海底粒度相。
