Radionuclides and chronology of short sediment cores BY and ASH from the Israel inner Mediterranean shelf@en

Depth sections of two short sediment cores were analyzed in the Radioactivity measurements Laboratory at the University of Bremen by gamma spectrometry to determine the activities of natural and artificial gamma emitting radionuclides. The core chronology was based on a combination of two radiotracers, 210Pb and 137Cs, due to their suitable half-lives 22.2 and 30 years. A robust time-frame will enable to track the rapid changes in the sedimentation pattern of the Nile River along a S-N gradient observed in the cores GC and BC as a part of the project Rapid changes along the Israeli Mediterranean coast following the damming of the Nile and their influence on the Israeli inner shelf. In order to understand causes of recent sharp changes in sedimentation pattern on the inner Israeli shelf, dating of cores collected in the region is important.本研究于不来梅大学（University of Bremen）放射性测量实验室中，采用伽马能谱法对两根短沉积岩芯的深度分层样品进行分析，以测定天然与人工γ发射型放射性核素的活度。本次岩芯定年采用210Pb与137Cs两种放射性示踪剂联合定年方案，二者的半衰期分别为22.2年与30年，适配本研究的定年需求。作为“尼罗河筑坝后以色列地中海沿岸的快速变化及其对以色列内陆架的影响（Rapid changes along the Israeli Mediterranean coast following the damming of the Nile and their influence on the Israeli inner shelf）”项目的组成部分，可靠的年代框架可用于追踪GC与BC两根岩芯中观测到的、沿南北（S-N）梯度分布的尼罗河沉积模式快速变化。为明晰以色列内陆架近期沉积模式剧烈变化的成因，对该区域采集的岩芯开展定年分析至关重要。