Abstract：
90Sr and 210Pb are considered to be key radionuclides in internal exposure resulting from dietary intake, however, the established methods employed for their detection are time-comsuming. A method for the sequential separation of 90Sr and 210Pb using a Sr·spec resin by LSC measurement is developed, which is highly suitable for food safety monitoring as its minimal sample requirements. The sequential separation of Sr and Pb from the sample was using 0.05 mol/L HNO3 and 0.05 mol/L C6H5O7(NH4)3. The chemical recoveries of Sr and Pb measured using ICP-OES were 72-83% and 80-88%, respectively. The minimum detectable activities of 90Sr and 210Pb in the food sample were 36.2 mBq/kg and 28.6 mBq/kg, respectively, obtained from a 0.1 kg fresh sample and 300 min counting time. The method was validated using reference materials and compared with other methods. The feasibility of the developed method for other highly complex food matrices needs further investigation.
摘要：
90Sr和210Pb被认为是饮食摄入导致的内部暴露中的关键放射性核素，然而,用于检测它们的既定方法是耗时的。开发了一种通过LSC测量使用Sr·spec树脂顺序分离90Sr和210Pb的方法，这是非常适合食品安全监测作为其最低的样品要求。样品中Sr和Pb的顺序分离为0.05mol/LHNO3和0.05mol/LC6H5O7(NH4)3。使用ICP-OES测量的Sr和Pb的化学回收率分别为72-83％和80-88％，分别。食品样品中90Sr和210Pb的最低可检测活性分别为36.2mBq/kg和28.6mBq/kg,分别,从0.1kg新鲜样品和300分钟计数时间获得。使用参考材料对该方法进行了验证，并与其他方法进行了比较。开发的方法用于其他高度复杂的食品基质的可行性需要进一步研究。
