Paranhos Gazineu Maria Helena, de Araújo Andressa Arruda, Brandão Yana Batista, Hazin Clovis Abrahão, de O Godoy José Marcos
Departamento de Química/UNICAP, Rua do Príncipe No 526, 50050-900 Recife, Brazil.
J Environ Radioact. 2005;81(1):47-54. doi: 10.1016/j.jenvrad.2004.11.003.
Scales and sludge generated during oil extraction and production can contain uranium, thorium, radium and other natural radionuclides, which can cause exposure of maintenance personnel. This work shows how the oil content can influence the results of measurements of radionuclide concentration in scale and sludge. Samples were taken from a PETROBRAS unit in Northeast Brazil. They were collected directly from the inner surface of water pipes or from barrels stored in the waste storage area of the E&P unit. The oil was separated from the solids with a Soxhlet extractor by using aguarras at 90+/-5 degrees C as solvent. Concentrations of 226Ra and 228Ra in the samples were determined before and after oil extraction by using an HPGe gamma spectrometric system. The results showed an increase in the radionuclide concentration in the solid (dry) phase, indicating that the above radionuclides concentrate mostly in the solid material.
石油开采和生产过程中产生的水垢和污泥可能含有铀、钍、镭和其他天然放射性核素，这可能会导致维修人员受到辐射。这项工作展示了含油量如何影响水垢和污泥中放射性核素浓度的测量结果。样本取自巴西东北部的一个巴西国家石油公司（PETROBRAS）装置。它们直接从水管内表面或从勘探与生产装置废物储存区储存的桶中采集。使用索氏提取器，以90±5摄氏度的aguarras作为溶剂，将油从固体中分离出来。在石油提取前后，使用高纯锗γ能谱系统测定样本中镭-226和镭-228的浓度。结果表明，固相（干燥）中的放射性核素浓度有所增加，这表明上述放射性核素大多集中在固体物质中。
