Radiation Protection Department, Nuclear Research Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt.
J Environ Radioact. 2010 Apr;101(4):297-303. doi: 10.1016/j.jenvrad.2010.01.001. Epub 2010 Feb 18.
Distribution of cesium (134Cs and 137Cs) and strontium (Sr-II) between soil/water phases depends on many factors such as concentration of these ions between phases, the cation exchange capacity (CEC) of the soil as well as its clay content, chemical composition (especially Na, K, Ca, and Mg ions), grain size distribution, calcite, iron oxide content, and organic coatings. Distribution coefficients (Kd) of cesium (labeled with 137Cs) and strontium were measured on the grain size distributions > or = 32 microm of four soil samples. These soils were obtained from four different locations within Inshas site in Egypt and three groundwater samples were obtained from the same site locations. X-ray diffraction showed that the soil samples consisted mainly of quartz mixed with the minor amounts of kaolonite and clay minerals. Sorption experiments were carried out at strontium aqueous concentrations range 10(-7) to 10(-4) mol l(-1). The CEC and Kds for cesium and strontium were measured at the same metal concentrations range. Distribution coefficients of cesium were found to be influenced by the composition of the soil, while the distribution coefficients of strontium were found to depend on calcium concentrations in the soil/groundwater system. The aim of this study was to determine the safety assessment of disposal 137Cs radionuclide and Sr(II) in the aquifer regions inside the Inshas site. Sequential extraction tests showed that, strontium was associated with the carbonate fractions and majority of cesium was sorbed on the iron oxides and the residue.
铯（134Cs 和 137Cs）和锶（Sr-II）在土壤/水相间的分布取决于许多因素，例如相间这些离子的浓度、土壤的阳离子交换容量（CEC）及其粘土含量、化学组成（特别是 Na、K、Ca 和 Mg 离子）、粒度分布、方解石、氧化铁含量和有机涂层。在埃及 Inshas 站点的四个不同位置获得的四个土壤样本的粒度分布大于或等于 32 微米处测量了铯（用 137Cs 标记）和锶的分配系数（Kd）。X 射线衍射表明，土壤样品主要由石英组成，少量含有高岭石和粘土矿物。吸附实验在锶水溶液浓度范围为 10(-7) 至 10(-4) mol l(-1)下进行。在相同的金属浓度范围内测量了 CEC 和 Cs 和 Sr 的 Kd。发现铯的分配系数受土壤组成的影响，而锶的分配系数取决于土壤/地下水系统中的钙浓度。本研究的目的是确定在 Inshas 站点内含水层区域处置 137Cs 放射性核素和 Sr(II)的安全评估。顺序提取测试表明，锶与碳酸盐分数有关，大部分铯被吸附在氧化铁和残渣上。
