Radiotracers in the Black Sea

切尔诺贝利核反应堆事故后引入黑海的一套示踪剂将用于研究黑海的物理和地球化学过程。“可溶”放射性核素分布的演变，如Cs-134、Cs-137和Sr-90，将在两年内进行测量，并用于限制深水通风率。具有粒子缔合特性的放射性核素，如Ce-144、Ru-106、Ag-110M和Cm-242，将被用来追踪从黑海上层水域清除的金属，并将其运往和通过化跃层。将研究氧/缺氧边界附近的氧化/还原反应对对主要氧化还原条件敏感的核素的分布和相关联的影响。拟议的实地研究时间序列预计将区分事故产生的碎片的直接散落和随后从多瑙河和第聂伯河流域受污染地区通过河运运往黑海西北部的散落。

The suite of tracers introduced to the Black Sea following the Chernobyl nuclear reactor accident will be used to study physical and geochemical processes in the Black Sea. The evolution of the distribution of "soluble" radionuclides, such as Cs-134, Cs-137, and Sr-90, will be measured over a two-year period and used to constrain deep water ventilation rates. Radionuclides having particle associating characteristics, such as Ce-144, Ru-106, Ag-110m, and Cm-242, will be used to trace metal scavenging from the upper Black Sea waters and transport to and through the chemocline. The effects of the oxidation/reduction reactions around the oxic/anoxic boundary on the distribution and phase association of nuclides sensitive to the prevailing redox conditions will be studied. The time-series of proposed field studies is expected to distinguish between direct fallout of debris from the accident and that which subsequently is delivered to the Northwest Black Sea by riverine transport from contaminated areas in the watershed of the Danube and Dneper.