Radioactivity of anthropogenic origin in the Tejo Estuary and need for improved waste management and environmental monitoring
Radioactivity of anthropogenic origin in the Tejo Estuary and need for improved waste management and environmental monitoring
复制标题
DOI：
10.1080/00207233.2013.845714
复制
发表时间：
2013-12-01
影响因子：
--
通讯作者：
Malta, Margarida
中科院分区：
文献类型：
--
作者：
Carvalho, Fernando P.;Oliveira, Joao M.;Malta, Margarida
特茹河口是一个大型水体，周围有七个城市和工厂，含有污染物的废水排放到河口。医疗设施排放的液体废水中存在的用于核医学的人造放射性核素就是这种情况。对沿河口北岸取样的海藻、贻贝、鱼类、水和沉积物进行的放射性核素测量显示，存在源自里斯本核医学设施的 I-131 和 Tc-99m。鱼类中Tc-99m的浓度达到90Bqkg(-1)(湿重)，贻贝中I-131的浓度达到18Bqkg(-1)(湿重)，水中的浓度更高。放射性核素的另一个人为来源是工业废物，例如储存在河口南岸的磷酸生产副产品磷石膏。磷石膏中存在的主要放射性核素是Ra-226、Pb-210、Po-210和铀。磷石膏中Ra-226的浓度约为1000Bqkg(-1)，与Tejo河谷土壤中Ra-226相比是一个较高的值，
The Tejo Estuary is a large water body surrounded by seven municipalities and industries with liquid effluent discharges containing contaminants that reach the estuary. This is the case for man-made radionuclides used in nuclear medicine, present in liquid effluents discharged by medical facilities. Radionuclide measurements in seaweeds, mussels, fish, water and sediments sampled along the North bank of the estuary revealed the presence of I-131 and Tc-99m, originating from nuclear medicine facilities in Lisboa. Concentrations reached 90Bqkg(-1) (wet weight) of Tc-99m in fish, and 18Bqkg(-1) (wet weight) of I-131 in mussels, and were even higher in the water. Another anthropogenic source of radionuclides is industrial waste, such as phosphogypsum the by-product of phosphoric acid production stockpiled at the South bank of the estuary. Main radionuclides present in phosphogypsum are Ra-226, Pb-210, Po-210 and uranium. Concentrations of Ra-226 in phosphogypsum are about 1000Bqkg(-1), which is a high value in comparison with Ra-226 in soils of the Tejo valley,